DISSOLVABLE FRAC PLUG ADAPTER, METHOD FOR MEASURING DYNAMIC DOWNHOLE TEMPERATURE, AND METHOD FOR FABRICATING DISSOLVABLE FRAC PLUG

Abstract

A dissolvable frac plug adapter includes an adapter body and a temperature acquisition and recording apparatus, where the temperature acquisition and recording apparatus is fixed in the adapter body. The adapter body is configured to connect a setting tool and a dissolvable frac plug. The temperature acquisition and recording apparatus is configured to acquire and record an ambient temperature at which the adapter body is located. A method for measuring a dynamic downhole temperature using the dissolvable frac plug adapter and a method for fabricating a dissolvable frac plug using the dissolvable frac plug adapter are provided to measure the dynamic downhole ambient temperature during pumping of the dissolvable frac plug, which features convenient operation and low cost, provides a basis for material selection and design of an ideal dissolvable frac plug for a region, and facilitates fabrication of the ideal dissolvable frac plug for the region.

Claims

1. A dissolvable frac plug adapter, comprising an adapter body and a temperature acquisition and recording apparatus, wherein the temperature acquisition and recording apparatus is fixed in the adapter body; the adapter body is configured to connect a setting tool and a dissolvable frac plug; and the temperature acquisition and recording apparatus is configured to acquire and record an ambient temperature at a position where the adapter body is located.

2. The dissolvable frac plug adapter according to claim 1, wherein the dissolvable frac plug adapter further comprises a mounting pin; the adapter body is provided with a first mounting hole matched with the mounting pin; the mounting pin is inserted into the first mounting hole and is detachably connected with the adapter body; an end of the mounting pin is provided with a second mounting hole, the second mounting hole is a blind hole; an opening of the second mounting hole is provided with a cap plug matched with the opening; the cap plug is detachably connected with the second mounting hole; and the temperature acquisition and recording apparatus is provided in the second mounting hole.

3. The dissolvable frac plug adapter according to claim 2, wherein the mounting pin and the cap plug are made of a thermally conductive material.

4. The dissolvable frac plug adapter according to claim 1, wherein the adapter body is columnar.

5. A method for measuring a dynamic downhole temperature, comprising the following steps: mounting of a temperature acquisition and recording apparatus: mounting the temperature acquisition and recording apparatus in an adapter body; and connecting a setting tool with a dissolvable frac plug through the adapter body; first pumping: putting the dissolvable frac plug connected with the adapter body and the setting tool into a wellbore after the step of mounting the temperature acquisition and recording apparatus is completed; and injecting a pumping fluid into the wellbore through a wellhead to pump the dissolvable frac plug to a first setting position; first setting: setting after the dissolvable frac plug reaches the first setting position; first temperature acquisition and recording: acquiring and recording, by the temperature acquisition and recording apparatus, a dynamic ambient temperature in the steps of first pumping and first setting; first exiting: disconnecting the adapter body from the dissolvable frac plug after the step of first setting is completed; retrieving the adapter body and the setting tool out of the wellhead through the wellbore; and accessing the dynamic ambient temperature acquired and recorded by the temperature acquisition and recording apparatus in the adapter body in the step of first temperature acquisition and recording; and first fracturing: injecting a fracturing fluid into the wellbore through the wellhead after the step of first exiting is completed.

6. The method for measuring a dynamic downhole temperature according to claim 5, wherein in the step of first fracturing, a flow rate of the fracturing fluid is greater than a flow rate of the pumping fluid in the step of first pumping, and a total amount of the fracturing fluid injected into the wellbore is greater than a total amount of the pumping fluid injected into the wellbore in the step of first pumping.

7. The method for measuring a dynamic downhole temperature according to claim 5, wherein the method further comprises the following steps: second pumping: putting the adapter body with the temperature acquisition and recording apparatus into the wellbore after the step of first fracturing is completed; and injecting the pumping fluid into the wellbore through the wellhead to pump the adapter body downhole; second temperature acquisition and recording: acquiring and recording, by the temperature acquisition and recording apparatus, a dynamic ambient temperature in the step of second pumping; and second exiting: retrieving the adapter body out of the wellhead through the wellbore after the step of second temperature acquisition and recording is completed; and accessing the dynamic ambient temperature acquired and recorded by the temperature acquisition and recording apparatus in the adapter body in the step of second temperature acquisition and recording.

8. The method for measuring a dynamic downhole temperature according to claim 7, wherein in the step of second pumping, the adapter body is connected with the setting tool and the dissolvable frac plug, and the pumping fluid pumps the dissolvable frac plug connected with the adapter body and the setting tool to a second setting position; and the method further comprises the following steps: second setting: pumping the dissolvable frac plug to the second setting position after the step of second pumping is completed, and setting the dissolvable frac plug at the second setting position; wherein, after the step of second setting is completed, the dissolvable frac plug is disconnected from the adapter body, and then the step of second exiting begins; and the setting tool and the adapter body are retrieved out of the wellhead through the wellbore; and second fracturing: injecting the fracturing fluid into the wellbore through the wellhead after the step of second exiting is completed.

9. A method for fabricating a dissolvable frac plug, comprising: designing the dissolvable frac plug based on a dynamic ambient temperature measured by the method for measuring a dynamic downhole temperature according to claim 5.

10. The method for fabricating a dissolvable frac plug according to claim 9, wherein in a design process of the dissolvable frac plug, a dissolving temperature of the dissolvable frac plug is greater than a maximum dynamic ambient temperature acquired and recorded in the step of first temperature acquisition and recording.

11. The method for fabricating a dissolvable frac plug according to claim 9, wherein in the method for measuring a dynamic downhole temperature, in the step of first fracturing, the fracturing fluid has a flow rate greater than a flow rate of the pumping fluid in the step of first pumping, and a total amount of the fracturing fluid injected into the wellbore is greater than a total amount of the pumping fluid injected into the wellbore in the step of first pumping.

12. The method for fabricating a dissolvable frac plug according to claim 9, wherein the method for measuring the dynamic downhole temperature further comprises the following steps: second pumping: putting the adapter body with the temperature acquisition and recording apparatus into the wellbore after the step of first fracturing is completed; and injecting the pumping fluid into the wellbore through the wellhead to pump the adapter body downhole; second temperature acquisition and recording: acquiring and recording, by the temperature acquisition and recording apparatus, a dynamic ambient temperature in the step of second pumping; and second exiting: retrieving the adapter body out of the wellhead through the wellbore after the step of second temperature acquisition and recording is completed; and accessing the dynamic ambient temperature acquired and recorded by the temperature acquisition and recording apparatus in the adapter body in the step of second temperature acquisition and recording.

13. The method for fabricating a dissolvable frac plug according to claim 9, wherein in the method for measuring a dynamic downhole temperature, in the step of second pumping, the adapter body is connected with the setting tool and the dissolvable frac plug, and the pumping fluid pumps the dissolvable frac plug connected with the adapter body and the setting tool to a second setting position; and the method further comprises the following steps: second setting: pumping the dissolvable frac plug to the second setting position after the step of second pumping is completed, and setting the dissolvable frac plug at the second setting position; wherein, after the step of second setting is completed, the dissolvable frac plug is disconnected from the adapter body, and then the step of second exiting begins; and the setting tool and the adapter body are retrieved out of the wellhead through the wellbore; and second fracturing: injecting the fracturing fluid into the wellbore through the wellhead after the step of second exiting is completed.

14. The method for fabricating a dissolvable frac plug according to claim 11, wherein in a design process of the dissolvable frac plug, a dissolving temperature of the dissolvable frac plug is greater than a maximum dynamic ambient temperature acquired and recorded in the step of first temperature acquisition and recording.

15. The method for fabricating a dissolvable frac plug according to claim 12, wherein in a design process of the dissolvable frac plug, a dissolving temperature of the dissolvable frac plug is greater than a maximum dynamic ambient temperature acquired and recorded in the step of first temperature acquisition and recording.

16. The method for fabricating a dissolvable frac plug according to claim 13, wherein in a design process of the dissolvable frac plug, a dissolving temperature of the dissolvable frac plug is greater than a maximum dynamic ambient temperature acquired and recorded in the step of first temperature acquisition and recording.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0049] FIG. 1 is a first schematic view of a dissolvable frac plug adapter according to an embodiment of the present disclosure;

[0050] FIG. 2 is an A-A view;

[0051] FIG. 3 is a second schematic view of the dissolvable frac plug adapter according to an embodiment of the present disclosure;

[0052] FIG. 4 is a schematic view of an adapter body according to an embodiment of the present disclosure; and

[0053] FIG. 5 is a schematic view of a horizontal well according to an embodiment of the present disclosure.

[0054] Reference Numerals: 1. adapter body; 2. mounting pin; 3. temperature acquisition and recording apparatus; 4. cap plug; 5. second mounting hole; 6. joint; 7. first mounting hole; 8. wellhead; 9. wellbore; 10. first setting position; and 11. second setting position.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following describes the present disclosure in more detail with reference to the drawings.

[0056] As shown in FIGS. 1 to 5, an embodiment of the present disclosure provides a dissolvable frac plug adapter. The dissolvable frac plug adapter includes an adapter body 1 and a temperature acquisition and recording apparatus 3. The temperature acquisition and recording apparatus 3 is fixed in the adapter body 1. The adapter body 1 is configured to connect a setting tool and a dissolvable frac plug. The temperature acquisition and recording apparatus 3 is configured to acquire and record an ambient temperature at which the adapter body 1 is located. The temperature acquisition and recording apparatus 3 may be an existing miniature temperature acquisition and recording apparatus 3.

[0057] As a further solution of the embodiment of the dissolvable frac plug adapter, the adapter body 1 is columnar, preferably cylindrical. The adapter body 1 is provided with a front thin portion and a back thick portion, which are connected by a circular surface. The adapter body 1 is hollow and penetrates through the front thin portion and the back thick portion. The adapter body 1 is provided with a cylindrical inner cavity that is coaxial with the adapter body 1. The adapter body 1 has a front end connected with the dissolvable frac plug and a back end connected with the setting tool.

[0058] As a further solution of the embodiment of the dissolvable frac plug adapter, the dissolvable frac plug adapter further includes a mounting pin 2. The adapter body 1 is provided with a first mounting hole 7 matched with the mounting pin 2. The first mounting hole 7 is located at the thick portion of the adapter body 1. The first mounting hole 7 penetrates through two opposite sides of the adapter body 1 along a radial direction of the adapter body 1. The mounting pin 2 is inserted into the first mounting hole 7 and is detachably connected with the adapter body 1. An end of the mounting pin 2 is provided with a second mounting hole 5. The second mounting hole 5 is a blind hole. An opening of the second mounting hole 5 is provided with a cap plug 4 matched with the opening, and the cap plug 4 is detachably connected with the second mounting hole 5. The temperature acquisition and recording apparatus 3 is provided in the second mounting hole 5. The mounting pin 2 and the cap plug 4 are made of a thermally conductive material.

[0059] As a further solution of the embodiment of the dissolvable frac plug adapter, an outer wall of the mounting pin 2 is provided with an external thread, and an inner wall of the first mounting hole 7 is provided with an internal thread matched with the external thread. The mounting pin 2 is screwed with the adapter body 1 through the first mounting hole 7.

[0060] As a further solution of the embodiment of the dissolvable frac plug adapter, the end of the mounting pin 2 is provided with a joint 6 for driving the mounting pin 2 to rotate. Two ends of the mounting pin 2 and the joint 6 are all located in the first mounting hole 7. The external thread and the joint 6 are respectively provided at the two ends of the mounting pin 2. The internal thread is located on one side wall of the adapter body 1. The joint 6 may be an external hexagonal joint 6, and the mounting pin 2 may be rotated by a tool such as a socket wrench. The cap plug 4 is a cap plug 4 with a national pipe thread (NPT).

[0061] As a further solution of the embodiment of the dissolvable frac plug adapter, the mounting pin 2 penetrates through the inner cavity of the adapter body 1. The temperature acquisition and recording apparatus 3 is provided in the inner cavity of the adapter body 1.

[0062] An embodiment of the present disclosure provides a method for measuring a dynamic downhole temperature, including the following steps:

[0063] Mounting of a temperature acquisition and recording apparatus 3: Set, through computer software, a time and frequency of the temperature acquisition and recording apparatus 3 for acquisition and recording; mount the temperature acquisition and recording apparatus 3 in the adapter body 1; and connect a setting tool with a dissolvable frac plug through the adapter body 1.

[0064] First pumping: Put the dissolvable frac plug connected with the adapter body 1 and the setting tool into a wellbore 9 after the step of mounting the temperature acquisition and recording apparatus 3 is completed; and inject a pumping fluid into the wellbore 9 through a wellhead 8 to pump the dissolvable frac plug to a first setting position 10.

[0065] First setting: Set after the dissolvable frac plug reaches the first setting position 10.

[0066] First temperature acquisition and recording: acquire and record, by the temperature acquisition and recording apparatus, a dynamic ambient temperature 3 in the steps of first pumping and first setting.

[0067] First exiting: Disconnect the adapter body 1 from the dissolvable frac plug after the step of first setting is completed; retrieve the adapter body 1 and the setting tool out of the wellhead through the wellbore 9; and connect the temperature acquisition and recording apparatus 3 in the adapter body 1 with a computer to access the dynamic ambient temperature acquired and recorded in the step of first temperature acquisition and recording on the ground, where a minimum temperature for the dissolvable frac plug to dissolve in a region is greater than a maximum dynamic ambient temperature acquired and recorded in the step of first temperature acquisition and recording.

[0068] In the step of first exiting, the temperature acquisition and recording apparatus 3 may also acquire and record the dynamic ambient temperature.

[0069] The method for measuring a dynamic downhole temperature further includes: first fracturing: inject a fracturing fluid into the wellbore 9 through the wellhead 8 after the step of first exiting is completed.

[0070] In the step of first fracturing, the fracturing fluid has a flow rate greater than a flow rate of the pumping fluid in the step of first pumping, and the fracturing fluid injected into the wellbore 9 has a total amount greater than a total amount of the pumping fluid injected into the wellbore 9 in the step of first pumping. In a horizontal well at the same depth, the dynamic ambient temperature is related to the total amount and flow rate of the fluid in the wellbore 9. The dynamic ambient temperature in the wellbore 9 in the step of first fracturing is lower than or equal to the dynamic ambient temperature in the step of first pumping, which ensures that the dissolvable frac plug does not dissolve during pumping and fracturing.

[0071] The method for measuring a dynamic downhole temperature further includes the following steps:

[0072] Second pumping: Put the adapter body 1 with the temperature acquisition and recording apparatus 3 into the wellbore 9 after the step of first fracturing is completed; and inject the pumping fluid into the wellbore 9 through the wellhead 8 to pump the adapter body 1 downhole.

[0073] Second temperature acquisition and recording: Acquire and record, by the temperature acquisition and recording apparatus 3, a dynamic ambient temperature in the step of second pumping, where the dynamic ambient temperature is one in the horizontal well after the fracturing of a previous stage is completed.

[0074] Second exiting: Retrieve the adapter body 1 out of the wellhead through the wellbore 9 after the step of second temperature acquisition and recording is completed; and access the dynamic ambient temperature acquired and recorded by the temperature acquisition and recording apparatus 3 in the adapter body 1 in the step of second temperature acquisition and recording.

[0075] In the step of second pumping, the adapter body 1 is connected with the setting tool and the dissolvable frac plug, and the pumping fluid pumps the dissolvable frac plug connected with the adapter body 1 and the setting tool to a second setting position 11.

[0076] The method for measuring a dynamic downhole temperature further includes the following steps:

[0077] Second setting: Pump the dissolvable frac plug to the second setting position 11 after the step of second pumping is completed, and set the dissolvable frac plug at the second setting position 11, where the second setting position 11 is behind the first setting position 10.

[0078] After the step of second setting is completed, the dissolvable frac plug is disconnected from the adapter body 1, and then the step of second exiting begins; and the setting tool and the adapter body 1 are retrieved out of the wellhead through the wellbore 9.

[0079] Second fracturing: Inject the fracturing fluid into the wellbore 9 through the wellhead 8 after the step of second exiting is completed.

[0080] The temperature acquisition and recording apparatus 3 in the wellbore 9 may acquire and record the dynamic ambient temperature in each of the steps.

[0081] In the embodiment of the method for measuring a dynamic downhole temperature, in the multi-stage hydraulic fracturing process, the dynamic ambient temperature of a stage of the horizontal well during pumping is acquired through the pumping step of the previous stage. The dynamic ambient temperature of the previous stage after completion of the fracturing is acquired through the pumping step of the following stage. The dissolvable frac plug is designed based on the two dynamic ambient temperatures, which ensures that the dissolvable frac plug does not dissolve prematurely before the fracturing is completed. In the horizontal well, the depth is the same everywhere and the dynamic temperature is similar everywhere. Therefore, composite data can be acquired by repeating the measurement multiple times, so as to design the dissolvable frac plug for the horizontal well in the region.

[0082] An embodiment of the present disclosure provides a method for fabricating a dissolvable frac plug, which designs the dissolvable frac plug based on a dynamic ambient temperature measured by the method for measuring a dynamic downhole temperature.

[0083] In the design of the dissolvable frac plug, a dissolving temperature of the dissolvable frac plug is greater than a maximum dynamic ambient temperature acquired and recorded in the step of first temperature acquisition and recording. The dissolvable frac plug is designed based on the dynamic ambient temperature acquired and recorded in the step of second temperature acquisition and recording, and it can be quickly and fully dissolved.

[0084] Certainly, the present disclosure may further include other various embodiments. Those skilled in the art may make various modifications and variations to the present disclosure without departing from the spirit and essence of the present disclosure, but these modifications and variations should all fall within the protection scope defined by the appended claims of the present disclosure.