Usage method of a negative pressure non-kill work string

Abstract

The present invention provides a method for using a negative pressure non-kill well process string, which includes a hanging packer, a back-insertion sealing nipple component, and a valve plate type check valve. The hanging packer includes an internal ball seat, and the internal ball seat is used to fix the inserted pressure balance nipple component; the upper end of the back-insertion sealing nipple component is connected to the lower end of the hanging packer, and the back-insertion sealing nipple component is used to lock the inserted sealing assembly component; and the upper end of the valve plate type check valve is connected to the lower end of the back-insertion sealing nipple component. The pressure balance nipple component is inserted into the valve plate type check valve to push open the valve plate of the valve plate type check valve. When the inserted sealing assembly component is locked by the back-insertion sealing nipple component, the inserted sealing assembly component is inserted into the internal control of the valve plate type check valve to open the valve plate type check valve. This application combines the advantages of processes such as negative pressure perforation, liner hanger completion, and non-kill well operation for oil well maintenance, simplifies the operation process, reduces the construction cost, improves the well control and safety of workover construction, and reduces the risk of well leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas drilling, and particularly to a method for using a negative pressure non-kill work string. Background Art

[0002] At present, the functions of the work string used for oil and gas drilling are single, resulting in the problems of increased construction costs and low construction safety. Therefore, a method for using a negative pressure non-kill work string is needed to solve the above problems. Summary of the Invention

[0003] In view of this, an embodiment of the present invention provides a method for using a negative pressure non-kill work string. The negative pressure non-kill work string includes

[0004] A hanging packer, the hanging packer includes a built-in ball seat, and the built-in ball seat is used to fix the inserted pressure balance nipple component;

[0005] A back-insertion sealing nipple component, the upper end of the back-insertion sealing nipple component is connected to the lower end of the hanging packer, and the back-insertion sealing nipple component is used to lock the inserted sealing assembly component; and

[0006] A valve plate type check valve, the upper end of the valve plate type check valve is connected to the lower end of the back-insertion sealing nipple component, the pressure balance nipple component is inserted into the valve plate type check valve to push open the valve plate of the valve plate type check valve, and when the inserted sealing assembly component is locked by the back-insertion sealing nipple component, the inserted sealing assembly component is inserted into the internal control of the valve plate type check valve to open the valve plate type check valve.

[0007] In one embodiment, a screen pipe and a perforating gun are sequentially connected to the lower end of the negative valve plate type check valve; the perforating gun is used to detonate after pressurization.

[0008] In one embodiment, a shock absorber is further arranged between the lower end of the negative valve plate type check valve and the screen pipe.

[0009] In one embodiment, the back-insertion sealing nipple component and the inserted sealing assembly component are rotationally locked.

[0010] In one embodiment, the back-insertion sealing nipple component is provided with an annular support member, and the inserted sealing assembly component is provided with an annular load-bearing member matching the annular support member.

[0011] In one embodiment, an axial limiting member is arranged on the annular support member, a limiting block is arranged on the awakening support member, the limiting block matches the axial limiting member, and the axial limiting member is used to limit the axial movement of the limiting block when the limiting block rotates to the limiting position.

[0012] In one embodiment, the hanging packer is a large-bore high-temperature and high-pressure hanging packer.

[0013] In one embodiment, an electric pump is connected to the upper end of the insertable seal assembly component.

[0014] In one embodiment, a flowing string is connected to the upper end of the insertable seal assembly component.

[0015] In one embodiment, the upper end of the backinsert seal nipple component is threadedly connected to the lower end of the hanging packer.

[0016] The negative-pressure no-kill work string of the present application has the following beneficial effects compared with the prior art:

[0017] Before running in the hole the negative-pressure no-kill work string of the present application, connect the pressure balance nipple component to the built-in ball seat of the hanging packer, insert the pressure balance nipple component into the valve plate type check valve and push open the valve plate of the valve plate type check valve to make the valve plate type check valve in an open state. Then lower the negative-pressure no-kill work string into the well so that the perforating gun connected to the lower end of the valve plate type check valve reaches the corresponding perforating interval. Next, perform reverse circulation in the annulus to displace the low-density well fluid to the design requirement. Then set the hanging packer by dropping a ball and applying pressure. After releasing the string, pull out the released string above the hanging packer, perforate the entire wellbore by card punching. After perforation, pull out the released string while the released string carries the pressure balance nipple component out to close the valve plate type check valve. Then lower the insertable seal assembly component with an electric pump or a flowing string connected to its upper end into the inner hole of the valve plate type check valve to open the valve plate type check valve. Then lock the insertable seal assembly component with the backinsert seal nipple component, and production can start. When maintenance is needed later, only need to unlock the insertable seal assembly component from the backinsert seal nipple component, then the insertable seal assembly component can be taken out, and at the same time the valve plate type check valve is closed, eliminating operations such as killing the well. The present application combines the advantages of processes such as negative-pressure perforation, liner hanging completion, and no-kill operation for well repair, simplifies the operation process, reduces construction costs, improves well control and safety during workover construction, and reduces the risk of well leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is the first exemplary structural diagram of the negative-pressure no-kill work string of the present application;

[0020] Figure 2 This is the second exemplary structural diagram of the negative pressure non-kill work string of the present application;

[0021] Explanation of the attached drawing legend: 1. Suspension packer; 11. Built-in ball seat; 2. Back-insertion seal short joint component; 3. Valve plate type check valve; 4. Pressure balance short joint component; 5. Insertion type seal assembly component. Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] Please refer to Figure 1 and Figure 2 , the present invention provides a negative pressure non-kill work string, and the negative pressure non-kill work string includes:

[0024] A suspension packer 1, the suspension packer 1 includes a built-in ball seat 11, and the built-in ball seat 11 is used to fix the inserted pressure balance short joint component 4;

[0025] A back-insertion seal short joint component 2, the upper end of the back-insertion seal short joint component 2 is connected to the lower end of the suspension packer 1, and the back-insertion seal short joint component 2 is used to lock the insertion type seal assembly component 5; and

[0026] A valve plate type check valve 3, the upper end of the valve plate type check valve 3 is connected to the lower end of the back-insertion seal short joint component 2, the pressure balance short joint component 4 is inserted into the valve plate type check valve 3 to push open the valve plate of the valve plate type check valve 3, and when the insertion type seal assembly component 5 is locked by the back-insertion seal short joint component 2, the insertion type seal assembly component 5 is inserted into the internal control of the valve plate type check valve 3 to open the valve plate type check valve 3.

[0027] In one embodiment, a screen pipe and a perforating gun are sequentially connected to the lower end of the negative valve plate type check valve 3; the perforating gun is used to detonate after pressurization.

[0028] In one embodiment, a shock absorber is further provided between the lower end of the negative valve plate type check valve 3 and the screen pipe.

[0029] In one embodiment, the back-insertion seal short joint component 2 and the insertion type seal assembly component 5 are rotationally locked.

[0030] In one embodiment, the back-insertion seal short joint component 2 is provided with an annular support member, and the insertion type seal assembly component 5 is provided with an annular load-bearing member matching the annular support member.

[0031] In one embodiment, an axial limiting member is provided on the annular support member, the wake-up support member is provided with a limiting block, the limiting block is matched with the axial limiting member, and the axial limiting member is used to limit the axial movement of the limiting block when the limiting block rotates to the limiting position.

[0032] In one embodiment, the hanging packer 1 is a large-diameter high-temperature and high-pressure hanging packer.

[0033] In one embodiment, an electric pump is connected to the upper end of the insertable seal assembly component 5.

[0034] In one embodiment, a self-flowing tubing string is connected to the upper end of the insertable seal assembly component 5.

[0035] In one embodiment, the upper end of the backinsert seal nipple component 2 is threadedly connected to the lower end of the hanging packer 1.

[0036] Before the negative-pressure non-kill work string of the present application is lowered into the well, the pressure balance nipple component 4 is connected to the built-in ball seat 11 of the hanging packer 1, so that the pressure balance nipple component 4 is inserted into the valve plate type check valve 3 and the valve plate of the valve plate type check valve 3 is pushed open to make the valve plate type check valve 3 in an open state. Then, the negative-pressure non-kill work string is lowered into the well so that the perforating gun connected to the lower end of the valve plate type check valve 3 reaches the corresponding perforation section. Then, the annulus is reverse-circulated to displace the low-density well fluid to the design requirement. Then, the hanging packer 1 is set by dropping a ball and applying pressure. After releasing the string, the releasing string is pulled out above the hanging packer 1, and the entire wellbore is perforated by shooting. After perforation, the releasing string is pulled out while the releasing string carries the pressure balance nipple component 4 out to close the valve plate type check valve 3. Then, the insertable seal assembly component 5 with an electric pump or a self-flowing tubing string connected to the upper end is lowered into the inner hole of the valve plate type check valve 3 to open the valve plate type check valve 3. Then, the insertable seal assembly component 5 is locked with the backinsert seal nipple component, and production can be started. When maintenance is required later, it only needs to unlock the insertable seal assembly component 5 from the backinsert seal nipple component 2, and then the insertable seal assembly component 5 can be taken out. At the same time, the valve plate type check valve 3 is closed, eliminating operations such as killing the well.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for using a negative pressure non-kill work string, characterized in that, The negative pressure well killing - free work string includes: A suspension packer, the suspension packer includes a built - in ball seat, and the built - in ball seat is used to fix the inserted pressure balance nipple component; A back - inserted sealing nipple component, the upper end of the back - inserted sealing nipple component is connected to the lower end of the suspension packer, and the back - inserted sealing nipple component is used to lock the inserted sealing assembly component; and A valve - plate type check valve; The using method of the negative pressure well killing - free work string includes: Before the negative pressure well killing - free work string is lowered into the well, the upper end of the valve - plate type check valve is connected to the lower end of the back - inserted sealing nipple component, and the pressure balance nipple component is inserted into the valve - plate type check valve to push open the valve plate of the valve - plate type check valve; Lower the negative pressure well killing - free work string into the well, so that the perforating gun connected to the lower end of the valve - plate type check valve reaches the corresponding perforation section. Then, perform reverse circulation in the annulus to displace the low - density well fluid to the design requirement. Next, set the suspension packer by dropping a ball and applying pressure. After releasing the string, pull out the releasing string above the suspension packer, perforate the entire wellbore by card punching. After perforation, pull out the releasing string while the releasing string carries the pressure balance nipple component out to close the valve - plate type check valve. Then, lower the inserted sealing assembly component with an electric pump or a flowing - well string connected to its upper end into the inner hole of the valve - plate type check valve to open the valve - plate type check valve. Then, lock the inserted sealing assembly component with the back - inserted sealing nipple component, and then production can start; When the inserted sealing assembly component is locked by the back - inserted sealing nipple component, the inserted sealing assembly component is inserted into the inner control of the valve - plate type check valve to open the valve - plate type check valve.

2. The usage method of the negative pressure non-kill work string according to claim 1, characterized in that, The lower end of the valve - plate type check valve is sequentially connected with a screen pipe and a perforating gun; the perforating gun is used to detonate after pressurization.

3. The method for using the negative pressure non-kill work string according to claim 2, characterized in that, A shock absorber is also arranged between the lower end of the valve - plate type check valve and the screen pipe.

4. The method of using the negative pressure non-kill work string according to claim 1, characterized in that, The back - inserted sealing nipple component is rotationally locked with the inserted sealing assembly component.

5. The method for using the negative pressure non-kill work string according to claim 4, characterized in that, The back - inserted sealing nipple component is provided with an annular support, and the inserted sealing assembly component is provided with an annular load - bearing member that matches the annular support.

6. The method for using the negative pressure non-kill work string according to claim 5, characterized in that, An axial limiting member is arranged on the annular support, and the annular support is provided with a limiting block. The limiting block matches the axial limiting member, and the axial limiting member is used to limit the axial movement of the limiting block when the limiting block rotates to the limiting position.

7. The method for using the negative pressure non-kill well process string according to any one of claims 1-6, characterized in that, The suspension packer is a large - diameter high - temperature and high - pressure suspension packer.

8. The method of using the negative pressure non-kill well process string according to any one of claims 1-6, characterized in that, The upper end of the inserted sealing assembly component is connected with an electric pump.

9. The method for using the negative pressure non-kill work string according to any one of claims 1-6, characterized in that, The upper end of the inserted sealing assembly component is connected with a flowing - well string.

10. The method of using the negative pressure non-kill work string according to any one of claims 1-6, characterized in that, The upper end of the back - inserted sealing nipple component is threadedly connected to the lower end of the suspension packer.

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