Air-tight sealing bridge plug for oil pipe

Abstract

The invention relates to the technical field of oil and gas field development, and provides an oil pipe air-tight sealing bridge plug which comprises a mandrel, a locking ring, a locking ring sleeve, an anchoring system, a sealing assembly and a guide shoe. The locking ring, the locking ring sleeve, the anchoring system, the sealing assembly and the guide shoe are connected to the central spindle in a sleeving mode. The locking ring is connected to the mandrel in a sleeved mode, the locking ring sleeve is partially connected to the locking ring in a sleeved mode, the mandrel is partially connected to the locking ring in a sleeved mode, and the locking ring sleeve and the locking ring are locked through a set screw. The anchoring systems are located at the two ends of the sealing assembly to anchor the sealing assembly, and the anchoring systems and the sealing assembly are located between the lock ring sleeve and the guide shoe. According to the scheme, the oil pipe air-tight sealing bridge plug is simple in structure and high in reliability of effective sealing, and basically no bubble is generated after the oil pipe air-tight sealing bridge plug is set through experimental verification. The sealing device is mainly applied to sealing liquid or gas in an oil pipe or a sleeve which does not need to be recycled.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field development, and in particular to an oil pipe gas sealing bridge plug. Background Art

[0002] The traditional solution is usually an unsealable bridge plug, which has a complex structure, inconvenient operation and high price. Moreover, it is important to note that the unsealable bridge plug is provided with a return spring, which has the risk of failure during the setting process, that is, the risk of airtight failure. Summary of the invention

[0003] The purpose of the present invention is to solve at least one technical problem in the background technology, and provide a tubing gas-tight bridge plug, comprising: a mandrel, a locking ring, a locking ring sleeve, an anchoring system, a sealing assembly and a guide shoe; The locking ring, the locking ring sleeve, the anchoring system, the sealing assembly and the guide shoe are sleeved on the mandrel; The locking ring is sleeved on the mandrel, the locking ring sleeve is partially sleeved on the locking ring and partially sleeved on the mandrel, and the locking ring sleeve and the locking ring are locked by a set screw; The anchoring system is located at both ends of the sealing assembly to anchor the sealing assembly, and the anchoring system and the sealing assembly are located between the locking ring sleeve and the guide shoe.

[0004] According to one aspect of the present invention, it further comprises: a core bushing, which is sleeved on the core shaft, arranged adjacent to the lock ring, located on the inner side of one end of the lock ring sleeve, and the outer wall of which is connected to the lock ring sleeve through a shear screw.

[0005] According to one aspect of the present invention, it further comprises: a shear ring, wherein the shear ring is installed on one end of the mandrel close to the locking ring sleeve through a shear pin.

[0006] According to one aspect of the present invention, the anchoring system moves unidirectionally when subjected to a pushing force or a pulling force.

[0007] According to one aspect of the present invention, the anchoring system comprises: a first anchoring assembly and a second anchoring assembly, wherein the first anchoring assembly and the second anchoring assembly are symmetrically arranged at two ends of the sealing assembly; When the anchoring system is subjected to thrust or tension, the first anchoring assembly and the second anchoring assembly move in one direction.

[0008] According to one aspect of the present invention, the first anchor assembly comprises: a first slip and a first cone; The first slip has a first tapered hole extending outwardly toward the sealing assembly at one end away from the locking ring sleeve, and the first cone portion is inserted into the first tapered hole; The first cone is connected to the mandrel via a full-length taper groove pin.

[0009] According to one aspect of the present invention, the second anchor assembly comprises: a second slip and a second cone; The second slip has an end close to the lock ring sleeve and is provided with a second tapered hole expanding outwardly toward the sealing assembly, and the second cone portion is inserted into the second tapered hole; The second cone is connected to the mandrel via a full-length taper groove pin.

[0010] According to one aspect of the present invention, the sealing assembly comprises: a first protective ring, a first rubber barrel support ring, a rubber barrel, a second rubber barrel support ring and a second protective ring which are sequentially arranged along the direction from the first anchor assembly to the second anchor assembly; The first protective ring and the second protective ring are provided with a first conical surface on the inner wall facing the glue barrel, which expands outwards toward the glue barrel; The outer walls of the first rubber barrel support ring and the second rubber barrel support ring facing away from the rubber barrel are respectively provided with second conical surfaces that are matched and connected with the corresponding first conical surfaces.

[0011] According to one aspect of the present invention, the guide shoe is mounted on the mandrel by means of a set screw.

[0012] According to one solution of the present invention, when the oil pipe airtight sealing bridge plug of the present invention needs to be seated, the oil pipe airtight sealing bridge plug of the present invention is connected to the sealing tool, and after being lowered to the designed position, the sealing tool is started to push the locking ring sleeve downward, and the shear screw is cut off. The locking ring sleeve and the locking ring continue to move downward to push the first slip, and the first slip pushes the first cone downward along the conical surface, and the rubber barrel is pre-sealed. The rubber barrel is continued to be pushed downward, and the guide shoe supports the opened second slip. At this time, the second slip is anchored on the inner wall of the oil pipe or casing, and the second cone is supported by the second slip when it moves downward. Due to the continued squeezing of the rubber barrel, the first protective ring, the second protective ring, the first rubber barrel support ring and the second rubber barrel support ring are opened and attached to the inner wall of the oil pipe or casing to protect the rubber barrel. The sealing force is continued to be increased to separate the oil pipe airtight sealing bridge plug of the present invention from the sealing tool, and the sealing tool is lifted out of the wellhead, and the sealing is completed.

[0013] According to the solution of the present invention, the guide shoe remains stationary, the locking ring sleeve is pushed by the pressure setting tool, the shear screw is cut, and the locking ring sleeve is pushed downward, thereby opening the first slip, the second slip bites into the casing wall, the first slip continues to move downward and squeezes the rubber barrel, and the first protection ring, the second protection ring, the first rubber barrel support ring and the second rubber barrel support ring protect the rubber barrel when the rubber barrel is subjected to the upper and lower pressure difference. After the rubber barrel is set, it can effectively seal the formation gas and liquid.

[0014] According to the above scheme of the present invention, the oil pipe gas sealing bridge plug of the present invention has a simple structure and high reliability of effective sealing. After experimental verification, no bubbles are generated within 15 minutes after the oil pipe gas sealing bridge plug of the present invention is set. The present invention is mainly used to seal liquid or gas in oil pipes or casings that do not need to be recovered.

[0015] According to the above scheme of the present invention, the oil pipe gas sealing bridge plug of the present invention is mainly used to seal the oil pipe, and the well is shut down immediately after the last section of the oil pipe is pulled out. It can effectively seal the H2S and other gases in the formation when the oil pipe is pulled out after the oil pipe operation is completed 3600 meters underground. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view schematically showing the structural arrangement of an oil pipe gas-sealed bridge plug according to an embodiment of the present invention; Figure 2 A schematic diagram showing a state of a tubing gas-sealed bridge plug entering a well according to an embodiment of the present invention; Figure 3 The figure schematically shows a setting state diagram of an oil pipe gas sealing bridge plug according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only to enable those skilled in the art to better understand and thus implement the present invention, rather than implying any limitation on the scope of the present invention.

[0018] As used herein, the term “including” and variations thereof are to be interpreted as open-ended terms meaning “including, but not limited to.” The term “based on” is to be interpreted as “based, at least in part, on.” The terms “one embodiment” and “an embodiment” are to be interpreted as “at least one embodiment.”

[0019] Figure 1 The schematic diagram shows a cross-sectional view of the structure arrangement of an oil pipe gas sealing bridge plug according to an embodiment of the present invention. Figure 1 As shown, in this embodiment, the oil pipe air-sealed bridge plug comprises: a core shaft 1, a locking ring 2, a locking ring sleeve 3, an anchoring system, a sealing assembly and a guide shoe 4; The locking ring 2, the locking ring sleeve 3, the anchoring system, the sealing assembly and the guide shoe 4 are sleeved on the core shaft 1; The lock ring 2 is sleeved on the core shaft 1, the lock ring sleeve 3 is partially sleeved on the lock ring 2 and partially sleeved on the core shaft 1, and the lock ring sleeve 3 and the lock ring 2 are locked by a set screw 5; The anchoring system is located at both ends of the sealing assembly to anchor the sealing assembly, and the anchoring system and the sealing assembly are located between the locking ring sleeve 3 and the guide shoe 4.

[0020] Furthermore, if Figure 1 As shown, in this embodiment, the oil pipe gas sealing bridge plug of the present invention further includes: a bushing 6, which is sleeved on the core shaft 1, arranged adjacent to the lock ring 2, located inside one end (the left end in the figure) of the lock ring 3, and the outer wall is connected to the lock ring 3 through a shear screw 7. The function of the bushing 6 is to install the shear screw 7, and the shear screw 7 is installed together through the threaded hole of the lock ring 3 and the groove on the bushing 6.

[0021] Furthermore, if Figure 1 As shown, in this embodiment, the oil pipe airtight sealing bridge plug of the present invention further includes: a shear ring 8, which is installed on one end of the core shaft 1 close to the locking ring sleeve 3 through a shear pin 9.

[0022] Further, according to an embodiment of the present invention, the anchoring system moves unidirectionally when subjected to a thrust or a tension.

[0023] Furthermore, if Figure 1 As shown, in this embodiment, the anchoring system includes: a first anchoring component 10 and a second anchoring component 11, and the first anchoring component 10 and the second anchoring component 11 are symmetrically arranged at two ends of the sealing component; When the anchoring system is subjected to thrust or tension, the first anchoring assembly 10 and the second anchoring assembly 11 move in one direction. In this way, the sealing assembly located between the first anchoring assembly 10 and the second anchoring assembly 11 can be firmly anchored, thereby ensuring the position accuracy and sealing performance of the sealing assembly and the reliability of effective sealing.

[0024] Furthermore, if Figure 1 As shown, in this embodiment, the first anchor assembly 10 includes: a first slip 12 and a first cone 13; The first slip 12 is provided with a first tapered hole 14 extending outwardly toward the sealing assembly at one end away from the lock ring sleeve 3, and the first cone 13 is partially inserted into the first tapered hole 14; The first cone is connected to the core shaft 1 through a full-length cone groove pin (i.e., pin).

[0025] Furthermore, if Figure 1 As shown, in this embodiment, the second anchoring assembly 11 includes: a second slip 15 and a second cone 16; The second slip 15 is provided with a second tapered hole 17 which expands outwards toward the sealing assembly at one end close to the lock ring sleeve 3, and the second cone 16 is partially inserted into the second tapered hole 17; The second cone 16 is connected to the mandrel 1 via a full-length tapered groove pin.

[0026] As configured above, when the first cava 12 with multiple conical surfaces is subjected to thrust or when the second cava 15 with multiple conical surfaces is subjected to tension, the entire anchoring system can only move in one direction, upward or downward. In this way, the sealing assembly can be firmly anchored through the anchoring system to ensure positioning accuracy and sealing performance.

[0027] Furthermore, if Figure 1 As shown, in this embodiment, the sealing assembly includes: a first protective ring 18, a first rubber barrel support ring 19, a rubber barrel 20, a second rubber barrel support ring 21 and a second protective ring 22 which are sequentially arranged along the direction from the first anchor assembly 10 to the second anchor assembly 11; The first protective ring 18 and the second protective ring 22 are provided with a first conical surface 23 which expands outwards toward the rubber barrel 20 on the inner wall facing the rubber barrel 20; The first rubber barrel support ring 19 and the second rubber barrel support ring 21 are respectively provided with a second conical surface 24 on the outer wall facing away from the rubber barrel 20, which is matched and connected with the corresponding first conical surface 23. Such a configuration can assist the rubber barrel 20 in sealing when it is set, and after the rubber barrel 20 is set, it can withstand the upper and lower pressure difference to protect the rubber barrel 20.

[0028] Furthermore, if Figure 1 As shown, in this embodiment, the guide shoe 4 is mounted on the core shaft 1 by means of a set screw 5 .

[0029] Furthermore, if Figure 2 As shown, when the oil pipe airtight sealing bridge plug of the present invention needs to be set, the oil pipe airtight sealing bridge plug of the present invention is connected to the setting tool 25, and after being lowered to the designed position, the setting tool 25 is started to push the locking ring sleeve 3 downward, and the shear screw 7 is cut off. The locking ring sleeve 3 and the locking ring 2 continue to move downward to push the first slip 12, and the first slip 12 pushes the first cone 13 downward along the conical surface, and the rubber barrel 20 is pre-set. The rubber barrel 20 is continuously pushed downward, and the guide shoe 4 supports the opened second slip 15. At this time, the second slip 15 is anchored as shown in FIG. Figure 3 As shown in the figure, the second cone 16 is supported by the second slip 15 when it moves downward, and the first protective ring, the second protective ring, the first rubber barrel support ring and the second rubber barrel support ring are opened and attached to the inner wall of the tubing or casing 26 due to the continuous squeezing of the rubber barrel 20, so as to protect the rubber barrel 20. The setting force is further increased to separate the tubing gas-sealed bridge plug of the present invention from the setting tool 25, and the setting tool 25 is lifted out of the wellhead, and the setting is completed.

[0030] According to the above solution of the present invention, the guide shoe 4 remains stationary, and the locking ring sleeve 3 is pushed by the pressure setting tool 25, the shear screw 7 is cut off, and the locking ring sleeve 3 is pushed downward, so that the first slip 12 is opened, the second slip 15 bites into the casing wall, and the first slip 12 continues to move downward to squeeze the rubber barrel 20. The first protective ring, the second protective ring, the first rubber barrel support ring and the second rubber barrel support ring protect the rubber barrel 20 when the rubber barrel 20 is subjected to the upper and lower pressure difference. After the rubber barrel 20 is set, the formation gas and liquid can be effectively sealed.

[0031] According to the above scheme of the present invention, the oil pipe gas sealing bridge plug of the present invention has a simple structure and high reliability of effective sealing. After experimental verification, no bubbles are generated within 15 minutes after the oil pipe gas sealing bridge plug of the present invention is set. The present invention is mainly used to seal liquid or gas in oil pipes or casings that do not need to be recovered.

[0032] According to the above scheme of the present invention, the oil pipe gas sealing bridge plug of the present invention is mainly used to seal the oil pipe, and the well is shut down immediately after the last section of the oil pipe is pulled out. It can effectively seal the H2S and other gases in the formation when the oil pipe is pulled out after the oil pipe operation is completed 3600 meters underground.

[0033] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. Oil pipe air-sealed bridge plug, characterized in that: include: Mandrels, locking rings, locking ring sleeves, anchoring systems, sealing assemblies and guide shoes; The locking ring, the locking ring sleeve, the anchoring system, the sealing assembly and the guide shoe are sleeved on the mandrel; The locking ring is sleeved on the mandrel, the locking ring sleeve is partially sleeved on the locking ring and partially sleeved on the mandrel, and the locking ring sleeve and the locking ring are locked by a set screw; The anchoring system is located at both ends of the sealing assembly to anchor the sealing assembly, and the anchoring system and the sealing assembly are located between the locking ring sleeve and the guide shoe; The anchoring system comprises: a first anchoring assembly and a second anchoring assembly, wherein the first anchoring assembly and the second anchoring assembly are symmetrically arranged at two ends of the sealing assembly; When the anchoring system is subjected to thrust or tension, the first anchoring assembly and the second anchoring assembly move in one direction; The first anchor assembly includes: a first slip and a first cone; The first slip has a first tapered hole extending outwardly toward the sealing assembly at one end away from the locking ring sleeve, and the first cone portion is inserted into the first tapered hole; The first cone is connected to the mandrel by a full-length cone groove pin; The second anchor assembly includes: a second slip and a second cone; The second slip has an end close to the lock ring sleeve and is provided with a second tapered hole expanding outwardly toward the sealing assembly, and the second cone portion is inserted into the second tapered hole; The second cone is connected to the mandrel via a full-length taper groove pin.

2. The oil pipe airtight sealing bridge plug according to claim 1, characterized in that: Also includes: The core bushing is sleeved on the core shaft, arranged close to the locking ring, located on the inner side of one end of the locking ring sleeve, and the outer wall is connected to the locking ring sleeve through a shear screw.

3. The oil pipe airtight sealing bridge plug according to claim 1, characterized in that: Also includes: A shear ring is installed on one end of the mandrel close to the locking ring sleeve through a shear pin.

4. The oil pipe airtight sealing bridge plug according to claim 1, characterized in that: The anchoring system moves in one direction when subjected to thrust or tension.

5. The oil pipe airtight sealing bridge plug according to claim 1, characterized in that: The sealing assembly comprises: a first protective ring, a first rubber barrel support ring, a rubber barrel, a second rubber barrel support ring and a second protective ring which are sequentially arranged along the direction from the first anchor assembly to the second anchor assembly; The first protective ring and the second protective ring are provided with a first conical surface on the inner wall facing the glue barrel, which expands outwards toward the glue barrel; The outer walls of the first rubber barrel support ring and the second rubber barrel support ring facing away from the rubber barrel are respectively provided with second conical surfaces that are matched and connected with the corresponding first conical surfaces.

6. The oil pipe airtight bridge plug according to any one of claims 1 to 5, characterized in that: The guide shoe is mounted on the core shaft via a set screw.

Images