Methods for well construction and completion

Abstract

There is provided a method for well construction comprising the steps of: a first phase of the well construction, in which a bottom hole assembly, BHA, with a first drill is used for drilling, and a conductor casing is lowered into the well and cemented; a second phase of the well construction, in which a second drill is used for drilling, wherein a production adapter base, PAB, is installed in parallel with lowering a blowout preventer, BOP; and a third phase of the well construction in which a third drill is used for drilling, for the steps of landing and geonavigation inside a reservoir.

Claims

1. A method for well construction comprising the steps of: a first phase of the well construction, in which a bottom hole assembly, with a first drill is used for drilling, and a conductor casing is lowered into a well and cemented; a second phase of the well construction, in which a second drill is used for drilling, wherein a production adapter base is installed and lowering a blowout preventer at substantially the same time as the installation of the production adapter base; and a third phase of the well construction in which a third drill is used for drilling, including landing and geonavigation inside a reservoir.

2. The method according to claim 1, wherein the drilling of the first phase of the well construction further comprises: blasting or using a torpedo to open the well.

3. The method according to claim 1, wherein the second phase of well construction further comprises: drilling with seawater as a drilling fluid of the second drill; and returning the seawater to a seabed.

4. The method according to claim 1, wherein the third phase of well construction further comprises: drilling with synthetic or water-based fluid as a drilling fluid of the third drill in a closed circuit.

5. The method of according to claim 1, wherein a diameter of the first drill is greater than a diameter of the second drill.

6. The method according to claim 1, wherein a diameter of the second drill is greater than a diameter of the third drill.

7. The method according to claim 1, wherein after the third phase of well construction, the method further includes: conditioning the well, and replacing a drilling fluid with completion fluid.

8. The method according to claim 1 further comprising: performing a lower and upper completion of the well in a single maneuver.

9. The method according to claim 8, wherein the performing of the lower and upper completion in the single maneuver comprises: carrying out sand control using a stand-alone technique.

10. The method according to claim 8, wherein the performing of the lower and upper completion in the single maneuver comprises: carrying out sand control by a gravel pumping technique.

11. The method according to claim 8, wherein the performing of the lower and upper completion in the single maneuver comprises: installing at least one component selected from a first group consisting of: a hydraulic screen; a formation isolating valve; or a blind tube; and installing at least one component selected from a second group consisting of: a mechanical annular barrier; a cut-to-release type of packer; a tubing seal receptacle-hydraulic; string accessories; a hydraulic formation isolating valve; a production tube; a subsurface safety device; a string hanger; and a tubing hanger.

12. The method according to claim 11 further comprising: lowering an assembly with drill pipes to a bottom of the well after installing the at least one component from the first group, and the at least one component from the second group.

13. The method according to claim 11, wherein at least one of the following steps is performed after the at least one component from the first group, and the at least one component from the second group are installed: actuating the hydraulic screen; closing the formation isolating valve; seating the packer against the formation isolating valve; seating the MAB against the formation isolating valve; releasing the TSR hydraulic against the formation isolating valve; seating and testing the tubing hanger; opening the formation isolating valve with pressure cycles; acidizing the formation; taking action to prevent hydrates; closing the hydraulic formation isolating valve; closing the subsurface safety device; and installing a wet Christmas tree.

14. A method for well construction comprising the steps of: a first phase of the well construction, comprising: blasting or using a torpedo to open a well, and lowering a conductor casing into the well, and cementing the conductor casing; a second phase of the well construction comprising: drilling, and installing a production adapter base and lowering a blowout preventer at substantially the same time as the installation of the production adapter base; and a third phase of the well construction comprising drilling with a third drill for landing and geonavigation inside a reservoir.

15. The method according to claim 14 further comprising: performing a lower and upper completion in a single maneuver.

16. A well, constructed according to the following steps: a first phase, in which a bottom hole assembly, with a first drill is used for drilling, and a conductor casing is lowered into the well and cemented; a second phase, in which a second drill is used for drilling, wherein a production adapter base is installed and lowering a blowout preventer at substantially the same time as the installation of the production adapter base; and a third phase in which a third drill is used for drilling, for landing and geonavigation inside a reservoir.

17. The well according to claim 16 completed according to a completion process comprising: performing an upper and lower completion in a single maneuver.

18. A well, constructed according to the following steps: a first phase, comprising blasting or using a torpedo, and a conductor casing is lowered into the well and cemented; a second phase, in which a drill is used for drilling, wherein a production adapter base is installed and lowering a blowout preventer at substantially the same time as the installation of the production adapter base; and a third phase in which a drill is used for drilling, for landing and geonavigation inside a reservoir.

19. The well according to claim 18 completed according to a completion process comprising: performing an upper and lower completion in a single maneuver.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) The detailed description presented hereunder refers to the figures and their respective reference numbers.

(2) FIG. 1 shows a schematic diagram of a design of well installed in accordance with the method of the present disclosure.

(3) FIG. 2 shows a schematic diagram of a design of a well constructed in accordance with the method of the present disclosure using blasting or use of a torpedo.

DETAILED DESCRIPTION OF THE INVENTION

(4) Firstly, it is emphasized that the description given hereunder is based on a preferred embodiment of the disclosure. As will be obvious to a person skilled in the art, however, the disclosure is not limited to this particular embodiment.

(5) In addition, it is also important to point out that many elements used by the method described below will be described by their abbreviations, which are familiar to a person skilled in the art. This option is adopted with the aim of simplifying the description.

(6) FIG. 1 shows a schematic diagram of a design of well installed in accordance with the method of the present disclosure. The following description of the embodiments refer to this FIGURE.

(7) Relative to the known processes of the prior art, the main advantage of the design of the present disclosure is that it eliminates one drilling phase. This is achieved by executing landing and drilling of the horizontal phase in the reservoir (phases 3 and 4 of the slender design, described above) in a single phase. As previously described, the combination of landing and horizontal drilling are achieved in the disclosure by geonavigation of the drill bit and control of drilling fluids. Furthermore, lower completion and upper completion can be performed in a single manoeuvre, increasing the efficiency of the method of the present disclosure.

(8) The method for well construction and completion of the present disclosure comprises a first phase, in which a BHA (Bottom Hole Assembly) is used with a drill of a first diameter. A conductor casing may be lowered and cemented. Optionally, in this step, the drilling process may comprise blasting or be torpedo-based, as shown in FIG. 2, depending on the characteristics of the sea floor. The first phase of well construction may comprise blasting or use of a torpedo 22 without drilling.

(9) Optionally, the first drill diameter is 36″.

(10) Optionally, the diameter of said conductor casing in the first drilling phase is 30″.

(11) Next, a second phase of well construction comprises drilling with a drill of a second diameter. Seawater may be used as the drilling fluid with return to the seabed. In this step, drilling may be performed to a greater depth than in the conventional slender design, ending the phase close to (at a safe distance from) the top of the reservoir. By contrast, prior art methods end the second drilling phase very far from the reservoir.

(12) Optionally, the second drill diameter is the same as the first drill diameter. Alternatively, the second drill diameter may be smaller than the first drill diameter. Optionally, the second drill diameter is 12¼″ or 14¾″.

(13) In addition, in this second phase, a production casing may be lowered and cemented. The second phase amy also include installing and testing the BOP (Blow Out Preventer), and installing a PAB 3 (Production Adapter Base) with the SESV (Subsea Equipment Support Vessel).

(14) Optionally, the diameter of said production casing in the second phase is 9⅝″ or 10¾″.

(15) Next, the third phase of well construction comprises drilling with a drill of a third diameter. A synthetic or water-based fluid may be used as the drilling fluid in a closed circuit. A shale section may be drilled in this third phase. Drilling is continued for landing and for geonavigation of the drill inside the reservoir. This geonaviagation step may comprise inclined or horizontal drilling. At the end of this drilling step, the well is conditioned and the drilling fluid is replaced with completion fluid.

(16) Optionally, the third drill diameter smaller than the second drill diameter. The third drill diameter may be 8½″ or 9½″. The third drill diameter may be equivalent to that used in “phase 4” of a conventional “slender” well design. This maintains the manoeuvrability of the drill during the geonavigation stage, and it has been surprisingly identified that such a drill size may also be used during the landing stage, thus enabling one drilling phase to be used for both of those steps.

(17) Finally, more generally, the steps of carrying out lower and upper completion of the well is performed. These steps can be performed in a single manoeuvre.

(18) For this design of completion in a single manoeuvre, the sand control technique adopted may be stand-alone, which complies with the guidelines that are usually adopted. For producing wells, the type of sand control indicated for horizontal wells may be GPH (gravel pumping).

(19) With the aim of minimizing the impact of not using the propping agent, reducing the annular space, and minimizing the movement of fines, a hydraulic screen may be used. This hydraulic screen may extend up to the wall of the well.

(20) Optionally, for injection wells, the step of lower and upper completion in a single manoeuvre may comprise the steps of installing one or more of: Premium 13 screens, FIV 12 (formation isolating valve), blind tubes, MAB 11 (mechanical annular barrier, or mechanical barrier of annulus), string packer 10 of the cut to release type, TSRH 8 (Tubing Seal Receptacle Hydraulic or telescopic seal), string accessories, such as PDG 7 (Pressure Downhole Gauge), valve HFIV 6 (Hydraulic Formation Isolating Valve), production tubes 4, SSSD 2 (Sub Surface Safety Device) and TH 14 (Tubing Hanger or string suspender).

(21) Optionally, for producing wells, the step of lower and upper completion in a single manoeuvre may comprise the steps of installing one or more of: hydraulic screens, FIV 12 (formation isolating valve), blind tubes, MAB 11 (mechanical barrier of annulus), string packer 10 of the cut to release type, TSRH 8 (Tubing Seal Receptacle Hydraulic or telescopic seal), string accessories, such as PDG 7 (Pressure Downhole Gauge), CIM (Chemical Injection Mandrel), and GLM 5 (Gas Lift Mandrel), HFIV valve 6 (Hydraulic Formation Isolating Valve), production tubes 4, SSSD 2 (Sub Surface Safety Device) and TH 14 (Tubing Hanger or string suspender).

(22) Thus, to summarize, the step of lower and upper completion in a single manoeuvre may comprise at least one step among:

(23) installing at least one component from a first group of conventionally lower-completion components: hydraulic screens; formation isolating valve FIV; or blind tubes; and installing at least one component from a second group of conventionally upper-completion components: mechanical annular barrier, MAB; packer of the cut to release type; tubing seal receptacle, TSR hydraulic; string accessories; hydraulic formation isolating valve, HFIV; production tubes; subsurface safety device, SSSD; string hanger; and tubing hanger TH.

(24) lowering the assembly with 6⅝″ drill pipes or DPR (Drill Pipe Riser) to the bottom of the well;

(25) actuating the hydraulic screens 13;

(26) closing FIV 12 (formation isolating valve);

(27) seating packer 10 against FIV 12 (formation isolating valve);

(28) seating MAB 11 (mechanical barrier of annulus) against FIV 12 (formation isolating valve);

(29) releasing TSRH 8 (Tubing Seal Receptacle hydraulic) against FIV 12 (formation isolating valve);

(30) seating and testing TH 14;

(31) opening FIV 12 (formation isolating valve) with pressure cycles;

(32) acidizing the formation (in the case of injection wells);

(33) taking action to prevent hydrates;

(34) closing HFIV 6 (Hydraulic Formation Isolating Valve);

(35) closing SSSD 2 (Sub Surface Safety Device); and

(36) installing WCT 1 (Wet Christmas Tree) with SESV (Subsea Equipment Support vessel).

(37) In other words, completion in a single manoeuvre can include installing upper and lower completion components on the string, such that said string can perform the installation and actuation steps of upper and lower completion in a single manoeuvre. Namely, the string assembly containing the upper and lower completion components is only lowered into the well once. The string assembly does not need to be withdrawn between the conventional steps of upper completion and lower completion.

(38) It may be pointed out that the method of designing a well now described may be applied in directional or horizontal producing or injection wells in sandstone reservoirs.

(39) In the case of carbonate reservoirs, the technique may also be applicable for producing wells and injection wells. However, in this case, it is preferable to replace the sand control screens 13 with a perforated liner. Of course, a person skilled in the art will have no difficulty in carrying out this replacement in the case of this specific application.

(40) Numerous variations falling within the scope of protection of the present application are permitted. This reinforces the fact that the present invention is not limited to the particular configurations/embodiments described above. Modifications of the above-described apparatuses and methods, combinations between different variations as practicable, and variations of aspects of the invention that are obvious to those of skill in the art are intended to be within the scope of the claims.