Drilling fluid lubricant and preparation method and use thereof

Abstract

The present disclosure provides a drilling fluid lubricant and a preparation method and use thereof. The preparation method includes steps of: 1) mixing styrene and water, then adding a nano-inorganic intermediate, a crosslinking agent and an emulsifier and stirring to obtain a first mixture; 2) under an inert atmosphere, stirring the first mixture to obtain an intermediate emulsion; then heating the intermediate emulsion to 70-85° C., then adding an initiator, keeping temperature and stirring for 7-10 hours to obtain an emulsion of polystyrene nanocomposite with a particle size of 40-90 nm; the emulsion of polystyrene nanocomposite being sequentially subjected to a granulating treatment to obtain polystyrene nanocomposite particles; 3) mixing industrial base oil, polystyrene nanocomposite particles and industrial oleic acid, and stirring evenly at room temperature to obtain the drilling fluid lubricant.

Claims

1. A preparation method of a drilling fluid lubricant, characterized by comprising the following steps: 1) mixing styrene and water, then adding a nano-inorganic intermediate, a crosslinking agent and an emulsifier and stirring to obtain a first mixture; wherein a mass ratio of the styrene to the water is 1:(4.5-6.5); a mass ratio of the styrene, the nano-inorganic intermediate, the crosslinking agent and the emulsifier is 1:(0.01-0.1):(0.04-0.06):(0.018-0.032); 2) under an inert atmosphere, stirring the first mixture to obtain an intermediate emulsion; then heating the intermediate emulsion to 70-85° C., then adding an initiator, keeping temperature and stirring for 7-10 hours to obtain an emulsion of polystyrene nanocomposite with a particle size of 40-90 nm; a mass ratio of the styrene to the initiator is 1:(0.002-0.008); the emulsion of polystyrene nanocomposite being sequentially subjected to a granulating treatment to obtain polystyrene nanocomposite particles; 3) mixing industrial base oil, polystyrene nanocomposite particles and industrial oleic acid, and stirring evenly at room temperature to obtain the drilling fluid lubricant; wherein a mass ratio of the industrial base oil, the polystyrene nanocomposite particles and the industrial oleic acid is 1:(0.005-0.025):(0.04-0.09).

2. The preparation method according to claim 1, wherein the nano-inorganic intermediate is prepared according to the following steps: a) mixing layered silicate and the water to obtain a second mixture, adjusting pH of the second mixture to 1-2, then heating to 70-80° C. and stirring for 30-40 minutes to obtain an activated silicate intermediate; a mass ratio of the layered silicate to the water is 1:(15-25); b) adding an intercalation agent to the activated silicate intermediate, and stirring to react for 10-12 h at 30-35 Hz to obtain an intercalation reaction system; a mass ratio of the activated silicate intermediate to the intercalation agent is 1:(0.025-0.5); c) subjecting the intercalation reaction system to filtration, washing, drying and grinding, to obtain the nano-inorganic intermediate.

3. The preparation method according to claim 2, wherein in the step a), one or more of hydrochloric acid, sulfuric acid and nitric acid is used to adjust the pH of the second mixture to 1-2.

4. The preparation method according to claim 3, wherein the intercalation agent is selected from one or more of sodium dodecyl sulfonate, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium hexadecyl sulfonate, sodium octadecyl sulfonate, sodium stearate, sodium palmitate, and sodium laurate.

5. The preparation method according to claim 1, wherein before the step 1), further comprises subjecting the styrene to a purification pretreatment, and the purification pretreatment comprises: rinsing the styrene using a sodium hydroxide aqueous solution with a mass fraction of 8%, then adjusting pH of the styrene to 7, and distilling under a reduced pressure, and a distillate is the styrene that has been subjected to the purification pretreatment.

6. The preparation method according to claim 1, wherein the industrial base oil is selected from one or more of industrial silicone oil, industrial white oil, industrial polyalphaolefin synthetic oil and industrial paraffin oil.

7. The preparation method according to claim 4, wherein the layered silicate is selected from one or more montmorillonite, hydrotalcite, kaolin, attapulgite, sepiolite, wollastonite, chlorite and layered silicate.

8. A drilling fluid lubricant obtained according to the preparation method of claim 1.

9. A drilling fluid comprising the drilling fluid lubricant according to claim 8, wherein a mass fraction of the drilling fluid lubricant in the drilling fluid is 0.2-5%.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is an X-ray diffraction diagram of a nano-inorganic intermediate prepared in Example 1 of the present disclosure;

(2) FIG. 2 is an X-ray diffraction diagram of a nano-inorganic intermediate prepared in Example 2 of the present disclosure;

(3) FIG. 3 is an X-ray diffraction diagram of a nano-inorganic intermediate prepared in Example 3 of the present disclosure;

(4) FIG. 4 is an X-ray diffraction diagram of an activated silicate intermediate in Examples 1-3 of the present disclosure;

(5) FIG. 5 is a scanning electron microscope diagram of polystyrene nanocomposite particles prepared in Example 5 of the present disclosure;

(6) FIG. 6 is a particle size distribution diagram of the polystyrene nanocomposite particles prepared in Example 5 of the present disclosure.

DESCRIPTION OF EMBODIMENTS

(7) To make the objectives, technical solutions, and advantages of embodiments of the present disclosure clearer, the following clearly and comprehensively describes the technical solutions in embodiments of the present disclosure with reference to the accompanying drawings in embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all embodiments of the present disclosure. All other embodiments obtained by persons of ordinary skill in the art based on embodiments of the present disclosure without creative effort shall fall within the protection scope of the present disclosure.

Example 1

(8) A preparation method of a nano-inorganic intermediate in this example is as follows:

(9) a) mixing layered silicate and water to obtain a second mixture, then adjusting the pH of the second mixture to pH=1 with 1 mol/L of hydrochloric acid solution, heating and stirring the second mixture to 75° C., keeping temperature and continuously stirring for 30-40 minutes to obtain an activated silicate intermediate;

(10) where a mass ratio of the silicate to the water is 1:20;

(11) b) adding a sodium hexadecyl sulfonate intercalation agent to the activated silicate intermediate, maintaining 75° C. and stirring at 30 Hz for 11 hours to obtain an intercalation reaction system;

(12) where a mass ratio of the activated silicate intermediate to the sodium hexadecyl sulfonate intercalation agent is 1:0.1;

(13) c) subjecting the intercalation reaction system to filtering, washing with deionized water several times, drying at 60° C. for 24 hours, grinding and passing through a 200-mesh sieve, to obtain the nano-inorganic intermediate.

(14) FIG. 1 is an X-ray diffraction diagram of the nano-inorganic intermediate of Example 1 of the present disclosure.

Example 2

(15) A preparation method of a nano-inorganic intermediate in this example is as follows:

(16) a) mixing layered silicate and water to obtain a second mixture, then adjusting the pH of the second mixture to pH=1 with 1 mol/L of hydrochloric acid solution, heating and stirring the second mixture to 75° C., keeping temperature and continuously stirring for 30-40 minutes to obtain an activated silicate intermediate;

(17) where a mass ratio of the silicate to the water is 1:20;

(18) b) adding a sodium hexadecyl sulfonate intercalation agent to the activated silicate intermediate, maintaining 75° C. and stirring at 30 Hz for 11 hours to obtain an intercalation reaction system;

(19) where a mass ratio of the activated silicate intermediate to the sodium hexadecyl sulfonate intercalation agent is 1:0.19;

(20) c) subjecting the intercalation reaction system to filtering, washing with deionized water several times, drying at 60° C. for 24 hours, grinding and passing through a 200-mesh sieve, to obtain the nano-inorganic intermediate.

(21) FIG. 2 is an X-ray diffraction diagram of the nano-inorganic intermediate of Example 2 of the present disclosure.

Example 3

(22) A preparation method of a nano-inorganic intermediate in this example is as follows:

(23) a) mixing layered silicate and water to obtain a second mixture, then adjusting the pH of the second mixture to pH=1 with 1 mol/L of hydrochloric acid solution, heating and stirring the second mixture to 75° C., keeping temperature and continuously stirring for 30-40 minutes to obtain an activated silicate intermediate;

(24) where a mass ratio of the silicate to the water is 1:20;

(25) b) adding a sodium hexadecyl sulfonate intercalation agent to the activated silicate intermediate, maintaining 75° C. and stirring at 30 Hz for 11 hours to obtain an intercalation reaction system;

(26) where a mass ratio of the activated silicate intermediate to the sodium hexadecyl sulfonate intercalation agent is 1:0.27;

(27) c) subjecting the intercalation reaction system to filtering, washing with deionized water several times, drying at 60° C. for 24 hours, grinding and passing through a 200-mesh sieve, to obtain the nano-inorganic intermediate.

(28) FIG. 3 is an X-ray diffraction diagram of the nano-inorganic intermediate of Example 3 of the present disclosure.

(29) FIG. 4 is an X-ray diffraction diagram of the activated silicate intermediate in Examples 1-3 of the present disclosure.

(30) It can be seen from FIGS. 1 to 4 that the interlamellar spacing of the nano-inorganic intermediates prepared by the present disclosure is significantly improved compared to the 1.21 nm interlamellar spacing of the activated silicate, corresponding to the interlamellar spacing of the nano-inorganic intermediates in Examples 1-3, which are increased to 1.68 nm, 2.36 nm and 2.45 nm respectively, indicating that intercalation modification is successful.

Example 4

(31) Before the preparation of drilling fluid lubricants, the styrene raw material is subjected to a purification pretreatment as follows to remove polymerization inhibitors in the styrene raw material: rinsing the styrene raw material with a 8% of NaOH solution to remove the polymerization inhibitors added therein, then rinsed with distilled water until a pH test paper shows neutral (pH=7), and distilling the styrene under a reduced pressure, the distillate is the purified styrene with a suitable polymerization purity.

(32) The above-mentioned purified styrene is used to prepare drilling fluid lubricants for all the following examples.

(33) A preparation method of the drilling fluid lubricant in this Example is as follows:

(34) 1) mixing styrene (after being subjected to the purification pretreatment) and water, then adding a nano-inorganic intermediate, a crosslinking agent and an emulsifier to obtain a first mixture;

(35) where a mass ratio of the styrene to the water is 1:5; a mass ratio of the styrene, the nano-inorganic intermediate, the crosslinking agent and the emulsifier is 1:0.01:0.05:0.025;

(36) 2) under an inert atmosphere (nitrogen gas with a purity of 99.999%, a pressure of 0.5-0.55 MPa, and a flow rate of 40-50 m.sup.3/h is injected for 30 minutes), stirring the first mixture to obtain an intermediate emulsion; then heating the intermediate emulsion to 75° C., then adding an initiator, keeping temperature and stirring for 8 hours to obtain an emulsion of polystyrene nanocomposite with a particle size of 40-90 nm; a mass ratio of the styrene to the initiator is 1:0.005;

(37) The emulsion of polystyrene nanocomposite is successively subjected to ethanol demulsification, filtering, drying at 60° C. for 24 hours, granulating, and passing through a 200-mesh sieve to obtain polystyrene nanocomposite particles;

(38) 3) mixing industrial polyalphaolefin synthetic oil, the polystyrene nanocomposite particles and industrial oleic acid, and stirring evenly at room temperature to obtain a drilling fluid lubricant;

(39) where a mass ratio of the industrial polyalphaolefin synthetic oil, the polystyrene nanocomposite particles and the industrial oleic acid is 1:0.001:0.05.

Example 5

(40) A preparation method of drilling fluid lubricant in this Example is as follows:

(41) 1) mixing styrene (after being subjected to the purification pretreatment) and water, then adding a nano-inorganic intermediate, a crosslinking agent and an emulsifier to obtain a first mixture;

(42) where a mass ratio of the styrene to the water is 1:5; a mass ratio of the styrene, the nano-inorganic intermediate, the crosslinking agent and the emulsifier is 1:0.03:0.05:0.025;

(43) 2) under an inert atmosphere (nitrogen gas with a purity of 99.999%, a pressure of 0.5-0.55 MPa, and a flow rate of 40-50 m.sup.3/h is injected for 30 minutes), stirring the first mixture to obtain an intermediate emulsion; then heating the intermediate emulsion to 75° C., then adding an initiator, keeping temperature and stirring for 8 hours to obtain an emulsion of polystyrene nanocomposite with a particle size of 40-90 nm; a mass ratio of the styrene to the initiator is 1:0.005;

(44) The emulsion of polystyrene nanocomposite is successively subjected to ethanol demulsification, filtering, drying at 60° C. for 24 hours, granulating, and passing through a 200-mesh sieve to obtain polystyrene nanocomposite particles;

(45) 3) mixing industrial polyalphaolefin synthetic oil, the polystyrene nanocomposite particles and industrial oleic acid, and stirring evenly at room temperature to obtain a drilling fluid lubricant;

(46) where a mass ratio of the industrial polyalphaolefin synthetic oil, the polystyrene nanocomposite particles and the industrial oleic acid is 1:0.001:0.05.

(47) FIG. 5 is a scanning electron microscope diagram of the polystyrene nanocomposite particles prepared in Example 5 of the present disclosure;

(48) FIG. 6 is a particle size distribution diagram of the polystyrene nanocomposite particles prepared in Example 5 of the present disclosure.

(49) It can be seen from FIGS. 5-6 that the particle size distribution of the polystyrene nanocomposite particles prepared by the present disclosure is mainly in the range of 40-90 nm, with an average particle size of 64.5 nm. The test results of FIG. 5 and FIG. 6 are similar, and the particles have a spherical structure, good sphericity, and a smooth surface.

Example 6

(50) A preparation method of drilling fluid lubricant in this Example is as follows:

(51) 1) mixing styrene (after being subjected to the purification pretreatment) and water, then adding a nano-inorganic intermediate, a crosslinking agent and an emulsifier to obtain a first mixture;

(52) where a mass ratio of the styrene to the water is 1:5; a mass ratio of the styrene, the nano-inorganic intermediate, the crosslinking agent and the emulsifier is 1:0.05:0.05:0.025;

(53) 2) under an inert atmosphere (nitrogen gas with a purity of 99.999%, a pressure of 0.5-0.55 MPa, and a flow rate of 40-50 m.sup.3/h is injected for 30 minutes), stirring the first mixture to obtain an intermediate emulsion; then heating the intermediate emulsion to 75° C., then adding an initiator, keeping temperature and stirring for 8 hours to obtain an emulsion of polystyrene nanocomposite with a particle size of 40-90 nm; a mass ratio of the styrene to the initiator is 1:0.005;

(54) The emulsion of polystyrene nanocomposite is successively subjected to ethanol demulsification, filtering, drying at 60° C. for 24 hours, granulating, and passing through a 200-mesh sieve to obtain polystyrene nanocomposite particles;

(55) 3) mixing industrial polyalphaolefin synthetic oil, the polystyrene nanocomposite particles and industrial oleic acid, and stirring evenly at room temperature to obtain a drilling fluid lubricant;

(56) where a mass ratio of the industrial polyalphaolefin synthetic oil, the polystyrene nanocomposite particles and the industrial oleic acid is 1:0.001:0.05.

Example 7

(57) A preparation method of drilling fluid lubricant in this Example is as follows:

(58) 1) mixing styrene (after being subjected to the purification pretreatment) and water, then adding a nano-inorganic intermediate, a crosslinking agent and an emulsifier to obtain a first mixture;

(59) where a mass ratio of the styrene to the water is 1:5; a mass ratio of the styrene, the nano-inorganic intermediate, the crosslinking agent and the emulsifier is 1:0.07:0.05:0.025;

(60) 2) under an inert atmosphere (nitrogen gas with a purity of 99.999%, a pressure of 0.5-0.55 MPa, and a flow rate of 40-50 m.sup.3/h is injected for 30 minutes), stirring the first mixture to obtain an intermediate emulsion; then heating the intermediate emulsion to 75° C., then adding an initiator, keeping temperature and stirring for 8 hours to obtain a emulsion of polystyrene nanocomposite with a particle size of 40-90 nm; a mass ratio of the styrene to the initiator is 1:0.005;

(61) The emulsion of polystyrene nanocomposite is successively subjected to ethanol demulsification, filtering, drying at 60° C. for 24 hours, granulating, and passing through a 200-mesh sieve to obtain polystyrene nanocomposite particles;

(62) 3) mixing industrial polyalphaolefin synthetic oil, the polystyrene nanocomposite particles and industrial oleic acid, and stirring evenly at room temperature to obtain a drilling fluid lubricant;

(63) where a mass ratio of the industrial polyalphaolefin synthetic oil, the polystyrene nanocomposite particles and the industrial oleic acid is 1:0.001:0.05.

(64) Hereinafter, drilling fluids are prepared using the drilling fluid lubricants in Examples 4-7. Before the preparation of the drilling fluids, the preparation of drilling fluid base slurry is completed by the following methods:

(65) adding montmorillonite and anhydrous sodium carbonate to deionized water, stirring at 5000 rpm on a high-speed mixer for 30 minutes, and then left to stand for 24 hours under an airtight condition at room temperature, a drilling fluid base slurry with a soil content of 6% is obtained. Where a mass-volume ratio of the montmorillonite to the deionized water is 1:16.7, and a mass ratio of the anhydrous sodium carbonate to the montmorillonite is 1:20 (for example, 30.0 g of the montmorillonite and 1.5 g of the anhydrous sodium carbonate are added to per 500 ml of the deionized water).

Example 8

(66) At room temperature, the drilling fluid lubricant prepared in Example 4 is added to the drilling fluid base slurry, and stirred at 5000 rpm for 5 minutes on the high-speed mixer to obtain a drilling fluid of this example. Where a mass fraction of the drilling fluid lubricant in the drilling fluid is 0.2%.

Example 9

(67) A drilling fluid of this example is prepared according to the same method as in Example 8. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 0.5%.

Example 10

(68) A drilling fluid of this example is prepared according to the same method as in Example 8. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 0.8%.

Example 11

(69) A drilling fluid of this example is prepared according to the same method as in Example 8. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 1.0%.

Example 12

(70) A drilling fluid of this example is prepared according to the same method as in Example 8. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 1.2%.

Example 13

(71) At room temperature, the drilling fluid lubricant prepared in Example 5 is added to the drilling fluid base slurry, and stirred at 5000 rpm for 5 minutes on the high-speed mixer to obtain a drilling fluid of this example. Where a mass fraction of the drilling fluid lubricant in the drilling fluid is 0.2%.

Example 14

(72) A drilling fluid of this example is prepared according to the same method as in Example 13. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 0.5%.

Example 15

(73) A drilling fluid of this example is prepared according to the same method as in Example 13. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 0.8%.

Example 16

(74) A drilling fluid of this example is prepared according to the same method as in Example 13. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 1.0%.

Example 17

(75) A drilling fluid of this example is prepared according to the same method as in Example 13. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 1.2%.

Example 18

(76) At room temperature, the drilling fluid lubricant prepared in Example 6 is added to the drilling fluid base slurry, and stirred at 5000 rpm for 5 minutes on the high-speed mixer to obtain a drilling fluid of this example. Where a mass fraction of the drilling fluid lubricant in the drilling fluid is 0.2%.

Example 19

(77) A drilling fluid of this example is prepared according to the same method as in Example 18. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 0.5%.

Example 20

(78) A drilling fluid of this example is prepared according to the same method as in Example 18. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 0.8%.

Example 21

(79) A drilling fluid of this example is prepared according to the same method as in Example 18. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 1.0%.

Example 22

(80) A drilling fluid of this example is prepared according to the same method as in Example 18. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 1.2%.

Example 23

(81) At room temperature, the drilling fluid lubricant prepared in Example 7 is added to the drilling fluid base slurry, and stirred at 5000 rpm for 5 minutes on the high-speed mixer to obtain a drilling fluid of this example. Where a mass fraction of the drilling fluid lubricant in the drilling fluid is 0.2%.

Example 24

(82) A drilling fluid of this example is prepared according to the same method as in Example 23. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 0.5%.

Example 25

(83) A drilling fluid of this example is prepared according to the same method as in Example 23. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 0.8%.

Example 26

(84) A drilling fluid of this example is prepared according to the same method as in Example 23. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 1.0%.

Example 27

(85) A drilling fluid of this example is prepared according to the same method as in Example 23. The difference is that the mass fraction of the drilling fluid lubricant in the drilling fluid is 1.2%.

(86) In the following, performance tests are performed on the drilling fluids of Examples 8-27, and the specific test method is specifically referred to Q/SY 1088-2012.

(87) 1. Lubrication Performance Test

(88) The drilling fluids of Examples 8-27 are taken, and their lubrication coefficients are tested on an extreme pressure lubricator. A lubrication coefficient reduction rate is calculated as follows:
R=(K0−K1)/K0*100%  (1)

(89) In the formula: R represents the lubrication coefficient reduction rate; K0 represents lubrication coefficient of the base slurry; K1 represents lubrication coefficient of the base slurry after the lubricant is added.

(90) The test results are shown in Table 1.

(91) TABLE-US-00001 TABLE 1 lubrication coefficient Example reduction rate (R, %) 8 62.2 9 72.0 10 85.5 11 89.3 12 89.6 13 65.3 14 76.5 15 88.4 16 91.0 17 91.6 18 63.3 19 74.5 20 86.3 21 90.6 22 90.4 23 62.7 24 75.4 25 87.8 26 89.6 27 90.2

(92) It can be seen from Table 1 that with the increase of the amount of the drilling fluid lubricant, lubrication performance of the drilling fluid is significantly improved, and the lubrication coefficient reduction rate is gradually increased, which indicates that the addition of the drilling fluid lubricant of the present disclosure can significantly improve lubrication performance of the drilling fluid and play a good role in reducing friction coefficient and improving effect of lubrication and drag reduction.

(93) 2. Rheological Performance Test

(94) The drilling fluids of Examples 8-27 are taken and poured into a measuring cup of a six-speed viscometer so that the liquid level is flush with a scale line outside the viscometer. A rotation speed of the viscometer is set at 600, 300, 200, 100, 6 and 3 rpm, and the measurement is carried out quickly from high speed to low speed. After a dial is stabilized, the readings at θ.sub.600, θ.sub.300, θ.sub.200, θ.sub.100, θ.sub.6, θ.sub.3 are recorded, respectively.

(95) After the above test is completed, the drilling fluid in the measuring cup is stirred at a speed of 600 r/min for 10 seconds, and after standing for 10 seconds, the measurement starts at 3 rpm, and a maximum value 03-1 of the dial is read. After re-stirring, let it stand for 10 minutes, measure at 3 rpm, and read a maximum value 03-2 of the dial.

(96) The value of each rheological parameter is calculated by the following formula:

(97) Apparent Viscosity:
AV=0.5*θ.sub.600□  (2)

(98) Plastic Viscosity:
PV=θ.sub.600−θ.sub.300  (3)

(99) Dynamic Shear Force:
YP=0.511*(θ.sub.300−PV)  (4)

(100) Static Shear Force:
G10″=0.511*θ.sub.3-1 (standing for 10 s)  (5)
G10″=0.511*θ.sub.3-2 (standing for 10 min)  (6)

(101) The test results are shown in Table 2.

(102) TABLE-US-00002 TABLE 2 Apparent Plastic Dynamic Static Viscosity Viscosity Shear Force Shear Force Example (mPa .Math. s) (mPa .Math. s) (Pa) (Pa/Pa) 8 13.5 12.0 6.6 5.1/16.4 9 14.0 12.0 6.6 5.6/16.4 10 14.0 12.0 7.1 5.1/16.4 11 14.0 12.0 7.1 5.6/16.4 12 13.5 12.0 6.6 5.6/16.4 13 14.0 12.0 7.1 5.6/16.4 14 13.5 12.0 7.1 6.1/17.4 15 14.0 13.0 6.6 6.1/17.4 16 14.0 12.0 6.6 6.6/17.4 17 14.0 12.0 7.1 6.6/17.4 18 13.5 12.0 6.6 5.6/16.9 19 14.0 12.0 6.6 5.1/16.9 20 14.0 12.0 7.1 5.1/16.4 21 14.0 13.0 6.1 5.1/16.4 22 14.0 12.0 7.1 5.1/16.9 23 14.0 12.0 7.1 5.1/16.4 24 14.0 13.0 7.7 5.1/16.4 25 14.0 12.0 7.1 5.6/16.4 26 14.0 13.0 6.1 5.1/16.4 27 13.5 11.0 7.7 5.1/15.8

(103) It can be seen from Table 2 that with the addition of the drilling fluid lubricant, the rheological parameters of Apparent Viscosity (AV), Plastic Viscosity (PV), Dynamic Shear Force (YP) and Static Shear Force (G10″/G10′) of the drilling fluid are basically unchanged, indicating that the lubricant has a good compatibility with the drilling fluid and will not have any adverse effect on the rheological parameters of the drilling fluid.

(104) 3. Filter Loss Performance Test

(105) Taking the drilling fluids of Examples 8-27 respectively, and adding the drilling fluids to a fluid loss cup of a filter loss tester so that the liquid level is flush a scale in the fluid loss cup, placing a measuring cylinder directly under the fluid loss cup, manually pressurizing and observing the pressure gauge reading, make it stable at 0.69 MPa, then adjusting the pressure reducing valve, stopping when the pressure drops slightly, starting to record the time when the first drop of water outflow is seen, measuring the filtrate volume after 30 min of water loss, which is the Filter Loss.

(106) The test results are shown in Table 3.

(107) TABLE-US-00003 TABLE 3 Example Filter Loss (mL) 8 6.4 9 6.0 10 5.8 11 5.5 12 4.9 13 6.3 14 5.8 15 5.6 16 5.3 17 4.9 18 5.9 19 5.6 20 5.2 21 4.6 22 4.4 23 6.1 24 5.7 25 5.3 26 4.8 27 4.7

(108) It can be seen from Table 3 that the addition of the lubricant has a certain effect on reducing the Filter Loss of the drilling fluid, and with the increase of the amount of the drilling fluid lubricant, the Filter Loss changes less.

(109) 4. Heat Resistance Test

(110) Taking the drilling fluid in Examples 11, 16, 21, and 26, and testing the performance changes of the drilling fluid after 16 h of hot rolling in a roller heating furnace at 120° C., 160° C., and 200° C., respectively.

(111) The test results are shown in Table 4.

(112) TABLE-US-00004 TABLE 4 Lubrication Dynamic coefficient Apparent Plastic Shear reduction Temperature Viscosity Viscosity Force rate (° C.) Example (mPa .Math. s) (mPa .Math. s) (Pa) (R, %) 120 11 21.5 14 7.7 86.3 16 21.0 14 7.2 88.6 21 20.5 13 7.7 90.5 26 22.0 14 8.2 91.3 160 11 23.5 15 8.7 85.5 16 24.0 16 8.2 87.4 21 24.0 15 9.2 88.1 26 23.5 14 9.7 89.7 200 11 25.5 16 9.7 84.2 16 25.5 16 9.7 85.7 21 26.5 17 9.7 85.9 26 26.5 17 9.7 86.0

(113) It can be seen from Table 4 that as the increase of a hot rolling temperature, the Apparent Viscosity, Plastic Viscosity and Dynamic Shear Force of the drilling fluid increase slightly, and the lubrication coefficient reduction rate decreases slightly, but the effect is not significant, and a high lubrication is still maintained, and the lubricated drilling fluid still has a high lubricating performance after 16 hours of hot rolling at 200° C., indicating that the lubricated drilling fluid has a temperature resistance of 200° C.

(114) 5. Foaming Performance Test

(115) Taking 20 parts of the drilling fluid base slurry with a volume of 300 mL, and then adding the drilling fluid lubricants prepared in Examples 8 to 27 to the 20 parts of the drilling fluid base slurry, respectively, stirring at 5000 rpm for 30 minutes on a high-speed mixer, and quickly pouring the stirred mixtures into measuring cylinders respectively, reading the volume change of drilling fluid before and after high stirring, respectively.

(116) The test results are shown in Table 5.

(117) TABLE-US-00005 Volume Volume before after high high stirring stirring Example (mL) (mL) 8 300.0 301.8 9 300.0 302.7 10 300.0 303.5 11 300.0 302.2 12 300.0 303.4 13 300.0 302.5 14 300.0 303.2 15 300.0 302.7 16 300.0 301.5 17 300.0 301.9 18 300.0 302.7 19 300.0 303.0 20 300.0 303.8 21 300.0 303.6 22 300.0 304.0 23 300.0 403.8 24 300.0 303.6 25 300.0 304.1 26 300.0 304.3 27 300.0 304.8

(118) It can be seen from Table 5 that the volumes of drilling fluid base slurry increase slightly before and after the addition of different mass fractions of the drilling fluid lubricants, but the foaming rate is very small, indicating that the addition of drilling fluid lubricants has almost no impact on the foam performance of the drilling fluid base slurry.

Comparative Examples 1-5

(119) In the drilling fluid base slurry, the commercially available drilling fluid lubricants RH8501 lubricant, DG5A lubricant, DG5B lubricant, RT9501 lubricant and RH525 lubricant are added at a mass fraction of 1.0% of the drilling fluid base slurry, respectively, to obtain the drilling fluids of the comparative examples 1-5.

(120) According to the same test methods as above, the Lubrication coefficient reduction rate and Filter Loss of the comparative examples 1-5 are tested, and the results are shown in Table 6.

(121) TABLE-US-00006 TABLE 6 Comparative Lubrication coefficient Filter Loss Example reduction rate (R, %) (mL) 1 45.3 7.3 2 66.4 6.9 3 59.6 4.8 4 70.8 6.7 5 68.5 5.4

(122) Comparing Table 6 with Table 1 and Table 3, it can be seen that compared with commercially available drilling fluid lubricants, the drilling fluid lubricant prepared by the present disclosure has a higher Lubrication coefficient reduction rate and a lower Fluid Loss, indicating that compared with other types of drilling fluid lubricants, the drilling fluid lubricant prepared by the present disclosure has better lubrication and drag reduction performance and lower Fluid Loss of drilling fluid performance.

(123) Finally, it should be noted that the foregoing examples are merely intended for describing the technical solutions of the present disclosure other than limiting the present disclosure. Although the present disclosure is described in detail with reference to the foregoing examples, persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing examples or make equivalent substitutions to some or all the technical features thereof, and these amendments and substitutions do not make the essence of the corresponding technical solutions departs from the scope of the technical solutions of examples of the present disclosure.