Ball-throwing-free temporary plugging bridge plug tool and under-pressure temporary plugging operation method based on same

Abstract

The invention relates to a bridge plug tool, in particular to a pitching-free temporary plugging bridge plug tool and an under-pressure temporary plugging operation method based on the pitching-free temporary plugging bridge plug tool, and solves the technical problems of poor sealing performance and low stability of an existing plugging process. The sealing reliability is high, and the double glue barrels are adopted, so that the sealing reliability is further improved; the clamping mode of the upper slip and the lower slip is adopted, the position reliability of the whole pitching-free temporary plugging bridge plug tool after setting is improved, the vertical displacement situation cannot happen easily, a conventional workover rig is matched for lowering a production pipe column, and the current pipe column production technology under operation under pressure is replaced.

Description

Technical Field

[0001] The invention relates to a bridge plugging tool, in particular to a temporary plugging bridge plugging tool without dropping a ball and a pressure-based temporary plugging operation method based on the tool. Background Art

[0002] With the gradual deepening of the development of tight gas, shale gas, tight oil, etc. in domestic oil and gas wells, cable operation technology has been increasingly applied to oil and gas well construction, and a series of processes and technologies have gradually been formed. Among these established processes and technologies, oil and gas well plugging technology has become one of the main research processes because it is related to the safety of the entire oil and gas well mining.

[0003] In the existing plugging technology, cement plugging, chemical plugging, and bridge plugging have some problems and poor use effects. The conventional soluble bridge plug plugging technology under cable belt pressure is not stable and moves upward in the wellbore. The sealing performance is poor during long-term sealing (sealing for more than 72 hours) and the dissolution time is short (dissolution time is less than 72 hours). Therefore, there is an urgent need for a tool and operation method that can improve the cable operation capacity, meet the needs of temporary plugging under pressure, and improve the cable operation. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of poor sealing and low stability in the existing plugging process, and to provide a ball-free temporary plugging bridge plugging tool and a pressure-based temporary plugging operation method based on the tool.

[0005] In order to achieve the above-mentioned invention object, the present invention provides the following technical solutions:

[0006] A temporary bridge plugging tool without ball throwing, which is special in that:

[0007] It comprises a main body, and a push ring, an upper slip, an upper guide cone, an upper rubber barrel, a partition, a lower rubber barrel, a lower guide cone, a lower slip and a guide shoe which are sequentially mounted on the main body from top to bottom;

[0008] The main body is provided with a through diameter which penetrates in the axial direction, and the upper end of the through diameter is used to be connected with the center rod of the setting tool;

[0009] The push ring is used to abut against the bridge plug push cylinder of the setting tool;

[0010] The guide shoe is provided with a plugging head for plugging the lower end of the passage, the main body and the guide shoe are connected by threads, and a shear pin is provided between the plugging head and the main body for fixing;

[0011] The upper end of the upper slip abuts against the lower end surface of the push ring, and the claw at the lower end cooperates with the conical surface of the upper guide cone;

[0012] The lower end of the lower slip abuts against the upper end surface of the guide shoe, and the claw at the upper end cooperates with the conical surface of the lower guide cone;

[0013] The lower end surface of the upper guide cone abuts against the upper rubber barrel, the upper rubber barrel abuts against the partition, the partition abuts against the lower rubber barrel, and the lower rubber barrel abuts against the upper end surface of the lower guide cone.

[0014] Furthermore, the upper end of the body is connected to the center rod of the electric setting tool or the gunpowder setting tool through an internal thread, and at least two top screws are provided on the body, and the center rod of the electric setting tool or the gunpowder setting tool is fixed in position by the top screws provided on the body.

[0015] Furthermore, there are two shear pins, which are arranged opposite to each other.

[0016] Furthermore, there are two top screws, which are arranged opposite to each other.

[0017] Furthermore, the body, push ring, upper slip, upper guide cone, partition, lower guide cone, lower slip, guide shoe, top screw, plugging head and shear pin are all made of aluminum-magnesium alloy soluble in chloride ions;

[0018] The upper rubber barrel and the lower rubber barrel are made of soluble rubber that is soluble when encountering chloride ions.

[0019] At the same time, the present invention also provides a temporary plugging operation method under pressure based on the above-mentioned ball-free temporary plugging bridge plugging tool, which is special in that it includes the following steps:

[0020] S1. Connect the cable, cable bridle, CCL unit, weight rod, setting tool, and ball-free temporary plugging bridge plug tool in sequence to form a pressurized temporary plugging tool string;

[0021] S2, lowering the pressurized temporary plugging tool string to a predetermined position in the wellbore;

[0022] S3. Calibrate the depth through the CCL unit to make the temporary plugging tool without ball dropping located at the predetermined position;

[0023] S4. Start the sealing tool through the operation panel of the cable logging vehicle, use the hydraulic pressure inside the sealing tool to make the bridge plug push tube of the sealing tool push the push ring, use the push ring to squeeze the upper rubber barrel and the lower rubber barrel to deform and seal the wellbore, and squeeze the upper slip and the lower slip to make them deform radially, and finally make the claws of the two get stuck on the inner wall of the wellbore to complete the wellbore sealing, and separate the center rod of the sealing tool from the body of the ball-free temporary plugging bridge plug tool;

[0024] S5, observe the wellhead pressure for 1-2 hours and the liquid discharge of the wellhead blowdown line to determine the plugging effect of the wellbore. If the plugging effect meets the preset requirements, execute step S6; if the plugging effect does not meet the preset requirements, return to step S1 and adjust the predetermined position in step S2 until the plugging effect meets the preset requirements;

[0025] S6. After waiting for 2-3 hours, observe whether the wellhead pressure meets the preset requirements. If so, use a conventional workover rig to lower the tubing to complete the installation of the gas tree or the oil tree, and complete the temporary plugging operation under pressure. If not, return to step S1 and adjust the predetermined position in step S2 until the wellhead pressure meets the preset requirements, then use a conventional workover rig to lower the tubing to complete the installation of the gas tree or the oil tree, and complete the temporary plugging operation under pressure.

[0026] Furthermore, it also includes step S7, injecting clean water through a pump truck connected to the wellhead or pressurizing the wellbore by using the pressure of the natural gas near the well. The injected high-pressure clean water liquid or natural gas enters the path of the main body and finally reaches the plugging head at the lower end of the path. Under the action of the upper and lower pressure differences, the plugging head cuts off the shear pin and then detaches from the guide shoe and falls to the bottom of the well, thereby establishing a production channel in the wellbore.

[0027] Further, in step S4, the setting tool is an electric setting tool or a gunpowder setting tool.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The present invention provides a ball-free temporary plugging bridge plug tool which innovatively adopts a double rubber barrel + double slips structure. When the ball-free temporary plugging bridge plug tool is seated in the wellbore by a sealing tool, the rubber barrel is squeezed and deformed, sticking to the inner wall of the wellbore to seal the wellbore pressure. The sealing reliability is strong, and the double rubber barrel is used to further improve the sealing reliability. The clamping form of the upper slip and the lower slip is adopted to improve the position reliability of the entire ball-free temporary plugging bridge plug tool after seating, and it will not easily move up and down.

[0030] (2) The ball-free temporary plugging bridge plug tool provided by the present invention can provide effective technical support for the subsequent zero-pressure operation at the wellhead, and at the same time provide a new idea and method for non-well pressure operation.

[0031] (3) The ball-free temporary plugging bridge plugging tool provided by the present invention has a simple structure and a small size, and can achieve plugging operations in the limited space of the wellbore, thereby improving operating efficiency.

[0032] (4) The present invention provides a temporary bridge plugging tool that does not require ball insertion and is made entirely of soluble materials. If it is no longer used, high-concentration potassium chloride or magnesium chloride is added, and the entire tool will dissolve on its own without the need for recycling, thereby saving the recycling cost of traditional bridge plugging tools and avoiding other problems that may arise during recycling.

[0033] (5) The present invention provides a method for temporary plugging under pressure based on a ball-free temporary plugging bridge plug tool. The ball-free temporary plugging bridge plug tool is used in conjunction with a conventional well repair rig to produce tubing, replacing the current process of producing tubing under pressure and providing a new idea for producing tubing with a well repair rig under zero pressure without well pressure operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional appearance schematic diagram of an embodiment of a temporary bridge plugging tool without ball throwing according to the present invention;

[0035] Figure 2 It is a cross-sectional view of an embodiment of a temporary bridge plugging tool without ball dropping according to the present invention.

[0036] The following are the descriptions of the reference numerals:

[0037] 1-body, 2-push ring, 3-upper slip, 4-upper guide cone, 5-upper rubber barrel, 6-partition, 7-lower rubber barrel,

[0038] 8-lower guide cone, 9-lower slip, 10-guide shoe, 11-top screw, 12-shear pin, 13-plugging head. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0040] Reference Figure 1-Figure 2 The ball-free temporary bridge plugging tool of the present invention comprises a main body 1, a through diameter penetrating in the axial direction is arranged on the main body 1, an internal thread is arranged on the upper end thereof for connecting with the center rod of an electric sealing tool or a gunpowder sealing tool, and two top screws 11 are arranged on the main body 1, the top screws 11 are used to fix the position of the center rod, and the two top screws 11 are arranged oppositely so that the center rod is evenly stressed.

[0041] A push ring 2, an upper slip 3, an upper guide cone 4, an upper rubber barrel 5, a partition 6, a lower rubber barrel 7, a lower guide cone 8, a lower slip 9 and a guide shoe 10 are sequentially mounted on the main body 1 from top to bottom. The lower end surface of the upper guide cone 4 abuts against the upper rubber barrel 5, the upper rubber barrel 5 and the partition 6, the partition 6 and the lower rubber barrel 7, and the lower rubber barrel 7 and the upper end surface of the lower guide cone 8, wherein the push ring 2 abuts against the bridge plug push cylinder of the sealing tool.

[0042] The guide shoe 10 is connected to the body 1 through a thread, and a plugging head 13 for plugging the lower end of the body diameter is arranged inside the guide shoe 10. The plugging head 13 can isolate the upper and lower connections inside the body 1. In order to fix the plugging head 13, a shear pin 12 is arranged between the plugging head 13 and the body 1. There are two shear pins 12 and they are arranged oppositely. Because after the temporary plugging operation under pressure is completed, the ball-free temporary plugging bridge plug tool needs to be penetrated to connect the upper and lower pressures of the wellbore, so the shear pin 12 needs to be sheared after the wellhead is pressurized. Therefore, the two shear pins 12 are arranged oppositely, so that the force of the entire plugging head 13 is uniform under the action of pressure.

[0043] The upper cava 3 has the same structure as the lower cava 9, and a plurality of claws are evenly distributed along the circumferential direction, and a plurality of teeth are evenly distributed along the axial direction on the claws. The upper end of the upper cava 3 abuts against the lower end face of the push ring 2, and the claw at its lower end cooperates with the conical surface of the upper guide cone 4; the lower end of the lower cava 9 abuts against the upper end face of the guide shoe 10, and the claw at its upper end cooperates with the conical surface of the lower guide cone 8. The upper cava 3 and the lower cava 9 adopting this structural form are more likely to undergo radial deformation when sealing, and the teeth are evenly distributed along the axial direction, which can ensure the fixing effect.

[0044] After the use of traditional bridge plugs, subsequent well repair operations such as drilling and grinding or lowering of tubing columns are required. During the recovery process, some well control or other unsafe situations often occur. The body 1, push ring 2, upper cava 3, upper cone barrel 4, partition 6, lower rubber barrel 7, lower cava 9, guide shoe 10, top screw 11, shear pin 12 and plugging head 13 of the ball-free temporary plugging bridge plug tool in this embodiment are all made of aluminum-magnesium alloy materials that are soluble in chloride ions. The upper rubber barrel 5 and the lower rubber barrel 7 are made of soluble rubber material that is soluble in chloride ions. If a high concentration of potassium chloride or magnesium chloride is injected into the wellbore after the use of the ball-free temporary plugging bridge plug tool, the entire device will dissolve by itself without the need for recovery, saving recovery costs.

[0045] At the same time, the present invention also provides a temporary plugging operation method under pressure based on the above-mentioned ball-free temporary plugging bridge plugging tool, comprising the following steps:

[0046] S1. Connect the cable, cable bridle, CCL unit, weight rod, setting tool, and ball-free temporary plugging bridge plug tool in sequence to form a pressurized temporary plugging tool string;

[0047] S2, lowering the pressurized temporary plugging tool string to a predetermined position in the wellbore;

[0048] S3. Calibrate the depth through the CCL unit to make the temporary plugging tool without ball dropping located at the predetermined position;

[0049] S4, start the sealing tool through the operation panel of the cable logging vehicle, use the hydraulic pressure inside the sealing tool to make the bridge plug push tube of the sealing tool push the push ring 2, use the push ring 2 to squeeze the upper rubber barrel 5 and the lower rubber barrel 7 to deform and seal the wellbore, and at the same time squeeze the upper slip 3 and the lower slip 9 to make them deform radially, and finally make the claws of the two get stuck on the inner wall of the wellbore to complete the wellbore sealing, and separate the center rod of the sealing tool from the body 1 of the temporary bridge plugging tool without dropping a ball;

[0050] S5, observe the wellhead pressure for 1-2 hours and the liquid discharge of the wellhead blowdown line to determine the plugging effect of the wellbore. If the plugging effect meets the preset requirements, execute step S6; if the plugging effect does not meet the preset requirements, return to step S1 and adjust the predetermined position in step S2 until the plugging effect meets the preset requirements;

[0051] S6, after waiting for 2-3 hours, observe whether the wellhead pressure meets the preset requirements, if so, use a conventional workover rig to lower the tubing to complete the installation of the gas tree or the oil tree, and complete the temporary plugging operation under pressure; if not, return to step S1, and adjust the predetermined position in step S2 until the wellhead pressure meets the preset requirements, and then use a conventional workover rig to lower the tubing to complete the installation of the gas tree or the oil tree, and complete the temporary plugging operation under pressure;

[0052] S7. Clean water is injected through a pump truck connected to the wellhead, or the pressure of the natural gas near the well is used to pressurize the wellbore. The injected high-pressure clean water liquid or natural gas enters the path of the main body 1 and finally reaches the plugging head 13 at the lower end of the path. Under the action of the upper and lower pressure differences, the plugging head 13 cuts off the shear pin 12 and then detaches from the guide shoe 10 and falls to the bottom of the well, thereby establishing a production channel in the wellbore.

[0053] In step S4, the sealing tool is a powder sealing tool or an electric sealing tool, and the CCL unit in step S1 is a professional device for detecting the lowering depth of the pressurized temporary plugging tool string.

[0054] The present invention adopts a double rubber barrel with double slips. After the ball-free temporary plugging bridge plug tool is sealed in the wellbore, the double rubber barrel is squeezed and deformed to fit tightly against the inner wall of the wellbore to complete the seal. The double rubber barrel greatly improves the sealing reliability. After the double slips cooperate with the respective guide cone surfaces, they undergo radial deformation, causing the slips to be stuck into the inner wall of the wellbore to achieve position locking. The double slips greatly improve the position reliability and will not easily move up and down. In addition, this tool and the temporary plugging operation method under pressure can cooperate with conventional well repair rigs to produce tubing, replacing the current production tubing process under pressure operation to provide a new idea for cooperating with well repair rigs to produce tubing under zero pressure in non-well operation.

[0055] The embodiments described above are merely descriptions of specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A temporary bridge plugging tool without ball throwing, characterized by: It comprises a body (1), and a push ring (2), an upper slip (3), an upper guide cone (4), an upper rubber barrel (5), a partition (6), a lower rubber barrel (7), a lower guide cone (8), a lower slip (9) and a guide shoe (10) which are sequentially mounted on the body (1) from top to bottom; The body (1) is provided with a through-path extending in the axial direction, the upper end of which is used to be connected to the center rod of the setting tool; The push ring (2) is used to abut against the bridge plug push cylinder of the setting tool; The guide shoe (10) is provided with a plugging head (13) for plugging the lower end of the passage, the main body (1) and the guide shoe (10) are connected by threads, and a shear pin (12) is provided between the plugging head (13) and the main body (1) for fixing; The upper end of the upper slip (3) abuts against the lower end surface of the push ring (2), and the claw at the lower end cooperates with the conical surface of the upper guide cone (4); The lower end of the lower slip (9) abuts against the upper end surface of the guide shoe (10), and the claw at the upper end cooperates with the conical surface of the lower guide cone (8); The lower end surface of the upper guide cone (4) and the upper rubber barrel (5), the upper rubber barrel (5) and the partition (6), the partition (6) and the lower rubber barrel (7), and the lower rubber barrel (7) and the upper end surface of the lower guide cone (8) are in contact with each other.

2. The ball-free temporary bridge plugging tool according to claim 1 is characterized in that: The upper end of the body (1) is connected to the center rod of an electric setting tool or a gunpowder setting tool via an internal thread, and the body (1) is provided with at least two top screws (11), and the center rod of the electric setting tool or the gunpowder setting tool is fixed in position by the top screws (11) provided on the body (1).

3. The ball-free temporary bridge plugging tool according to claim 2 is characterized in that: There are two shear pins (12) which are arranged opposite to each other.

4. The ball-free temporary bridge plugging tool according to claim 3 is characterized in that: There are two top screws (11) which are arranged opposite to each other.

5. The ball-free temporary bridge plugging tool according to claim 4 is characterized in that: The body (1), the push ring (2), the upper slip (3), the upper guide cone (4), the partition (6), the lower guide cone (8), the lower slip (9), the guide shoe (10), the top screw (11), the plugging head (13) and the shear pin (12) are all made of an aluminum-magnesium alloy that is soluble in chloride ions. The upper rubber barrel (5) and the lower rubber barrel (7) are made of soluble rubber that is soluble in chloride ions.

6. A temporary plugging operation method under pressure using the temporary plugging bridge plugging tool without dropping a ball according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Connect the cable, cable bridle, CCL unit, weight rod, setting tool, and ball-free temporary plugging bridge plug tool in sequence to form a pressurized temporary plugging tool string; S2, lowering the pressurized temporary plugging tool string to a predetermined position in the wellbore; S3. Calibrate the depth through the CCL unit to make the temporary plugging tool without ball dropping located at the predetermined position; S4, starting the sealing tool through the operation panel of the cable logging vehicle, using the hydraulic pressure inside the sealing tool to make the bridge plug push tube of the sealing tool push the push ring (2), using the push ring (2) to squeeze the upper rubber barrel (5) and the lower rubber barrel (7) to deform and seal the wellbore, and at the same time squeeze the upper slip (3) and the lower slip (9) to make them deform radially, and finally make the claws of the two get stuck on the inner wall of the wellbore to complete the wellbore sealing, and separate the center rod of the sealing tool from the body (1) of the temporary bridge plugging tool without dropping a ball; S5, observe the wellhead pressure for 1-2 hours and the liquid discharge of the wellhead blowdown line to determine the plugging effect of the wellbore. If the plugging effect meets the preset requirements, execute step S6; if the plugging effect does not meet the preset requirements, return to step S1 and adjust the predetermined position in step S2 until the plugging effect meets the preset requirements; S6. After waiting for 2-3 hours, observe whether the wellhead pressure meets the preset requirements. If so, use a conventional workover rig to lower the tubing to complete the installation of the gas tree or the oil tree, and complete the temporary plugging operation under pressure. If not, return to step S1 and adjust the predetermined position in step S2 until the wellhead pressure meets the preset requirements, then use a conventional workover rig to lower the tubing to complete the installation of the gas tree or the oil tree, and complete the temporary plugging operation under pressure.

7. The method for temporary plugging under pressure according to claim 6, characterized in that: The method further comprises step S7, wherein clean water is injected through a pump truck connected to the wellhead or the pressure of natural gas near the well is used to pressurize the wellbore. The injected high-pressure clean water liquid or natural gas enters the passage of the main body (1) and finally reaches the plugging head (13) at the lower end of the passage. Under the action of the upper and lower pressure differences, the plugging head (13) cuts off the shear pin (12) and then detaches from the guide shoe (10) downward and falls to the bottom of the well, thereby establishing a production channel in the wellbore.

8. The method for temporary plugging under pressure according to claim 7, characterized in that: In step S4, the setting tool is an electric setting tool or a gunpowder setting tool.

Images