Mechanical shut-in zonal production device
By adding a liner and through holes to form a gas flow channel in the packer, the problem of gas lock in the lower oil layer in a large-span, multi-layer production well was solved, and effective fluid production from the lower oil layer and improved well efficiency were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANJINUOER ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-09-22
- Publication Date
- 2026-07-21
AI Technical Summary
In oil wells with large spans and multiple layers, dissolved gas in the lower oil layer tends to accumulate in the annular space below the packer, causing gas lock and inhibiting the production of fluid from the lower oil layer. Existing technologies are unable to effectively solve this problem.
A mechanically sealed stratified oil production device is adopted. By adding liner pipes and through holes in the upper and lower packers, a gas guiding channel is formed, allowing the dissolved gas released from the lower oil layer to enter the annular space of the oil casing through the guiding pipe and be discharged from the wellhead, thus avoiding gas lock.
This achieved effective fluid production from the lower oil layer, improved oil well production efficiency, reduced development costs, and yielded significant economic benefits.
Smart Images
Figure CN224532704U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of oil and gas field exploration and development equipment, and relates to a mechanical plugging stratified oil production device. Background Technology
[0002] In oil wells with large spans and multiple layers, a hydrostatic pressure difference is generated due to the large distance between the upper and lower oil layers. When this pressure difference exceeds the production flow pressure of the lower oil layer, it will inhibit the production of fluid from the lower oil layer. The general solution to this problem is to use a conventional packer to separate the upper and lower oil layers and only produce fluid from the lower oil layer. However, if dissolved gas from the lower oil layer overflows and accumulates in the annular space below the packer, it can easily cause gas lock. When the pressure reaches the production flow pressure of the lower oil layer, it will also inhibit the production of fluid from the lower oil layer. Utility Model Content
[0003] The purpose of this invention is to provide a mechanically sealed stratified oil production device that solves the airlock problem that exists in the prior art when sealing the upper layer and producing the lower layer.
[0004] The technical solution adopted in this utility model is: The mechanical plugging stratified oil production device includes a guide pipe. One end of the guide pipe is threaded to an upper packer, and the other end is threaded to a lower packer. All three are connected by upper and lower connectors. The upper packer is used to plug the upper end of the target well section, and the lower packer is used to plug the lower end of the target well section. Gas flow channels are provided inside the upper packer, lower packer, and guide pipe, so that the dissolved gas released from the lower oil layer passes through the lower packer, guide pipe, and upper packer in sequence into the upper annular space of the oil casing, and is finally discharged from the wellhead.
[0005] The features of this utility model also include: The upper packer is an improvement on the existing Y114 packer. The specific modifications include: adding a first liner tube outside the first central tube; the inner and outer walls of one end of the first liner tube are connected to the first central tube and the first positioning ring respectively by threads; the outer wall of the other end is connected to the first rubber sleeve retaining ring by threads; several through holes axially penetrating its sidewalls are provided on the first lower connector; several first compression ring through holes radially penetrating its sidewalls are provided on the first compression ring; and several first liner tube through holes radially penetrating its sidewalls are provided on the first liner tube.
[0006] A sealing ring is provided at the threaded part of the first lower connector in the upper packer to seal the connection between the upper packer and the guide tube.
[0007] The lower packer is an improvement on the existing Y114 packer. The specific modifications include: adding a second liner outside the second central tube; the inner and outer walls of one end of the second liner are connected to the second central tube and the second rubber sleeve retaining ring by threads, respectively; the outer wall of the other end is connected to the second compression ring by threads; several through holes axially penetrating its sidewall are provided on the second upper connector; several second compression ring through holes radially penetrating its sidewall are provided on the second compression ring; and several second liner through holes radially penetrating its sidewall are provided on the second liner. The number of guide tubes is one or more connected end to end.
[0008] The guide tube includes an oil pipe, with a third upper connector and a third lower connector threaded to both ends of the oil pipe. Both the third upper connector and the third lower connector are provided with several through holes that axially penetrate their side walls. An outer tube is fitted over the oil pipe, and both ends of the outer tube are sealed by the third upper and lower connectors through sealing rings.
[0009] The other end of the third upper connector is threaded with a third upper connector retaining ring, and the other end of the third lower connector is threaded with a third lower connector retaining ring.
[0010] A sealing ring is provided between the third lower connector and the third lower connector retaining ring.
[0011] The beneficial effects of this utility model are: This utility model device adopts an annular flow guide combined packer, wherein both the upper and lower packers are based on the existing packers and have added liner tubes to form an annular space gap between them and the central tube for gas conduction; a gap is also formed between the oil pipe and the outer tube of the guide tube, which can not only ensure the isolation of the annular space of the oil casing and the oil pipe, but also conduct formation dissolved gas; the guide tube is one or more connected in series to meet the length requirements of the plugged well section.
[0012] When this utility model device is working, the upper and lower oil layers are sealed by upper and lower packers respectively. At the same time, the dissolved gas released from the lower oil layer enters the guide pipe through the gap between the central tube and the liner of the lower packer, enters the upper packer through the gap between the oil pipe and the outer tube of the guide pipe, flows out through the gap between the central tube and the liner of the upper packer, enters the annular space of the oil casing, and is discharged from the wellhead, eliminating the possibility of the oil pump being gas-locked, thereby achieving sealing the upper layer and producing the lower layer.
[0013] This utility model device can be used as a sealing tool for oil layers during sealing and extraction operations in oilfields with long-term shutdown wells and high water-cut wells. It can improve oil well extraction efficiency, reduce development costs, and obtain greater economic benefits. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of the stratified oil recovery device of this utility model; Figure 2This is a schematic diagram of the upper packer in the device of this utility model; Figure 3 This is a schematic diagram of the structure of the device of this utility model, in which the upper and lower connectors are provided with axial through holes; Figure 4 This is a schematic diagram of the flow guide tube in the device of this utility model; Figure 5 This is a schematic diagram of the lower packer structure in the device of this utility model.
[0015] In the figure, 1. Upper packer, 11. First lower connector retaining ring, 12. First lower connector, 13. First rubber sleeve retaining ring, 14. First compression ring, 15. First liner, 16. First central tube, 17. First pressure bearing cylinder, 18. First positioning ring, 19. First upper connector, 110. First side rubber sleeve, 111. First middle rubber sleeve, 112. First compression ring through hole, 113. First liner through hole; 2. Lower packer; 21. Second upper connector; 22. Second rubber sleeve retaining ring; 23. Second side rubber sleeve; 24. Second compression ring; 25. Second liner; 26. Second central tube; 27. Second pressure bearing cylinder; 28. Second positioning ring; 29. Second lower connector; 210. Second upper connector retaining ring; 211. Second middle rubber sleeve; 212. Second compression ring through hole; 213. Second liner through hole; 3. Guide pipe, 31. Third upper connector retaining ring, 32. Third upper connector, 33. Outer pipe, 34. Oil pipe, 35. Third lower connector, 36. Third lower connector retaining ring, 37. Sealing ring. Detailed Implementation
[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0017] Example 1: This utility model relates to a mechanical plugging stratified oil production device, the structure of which is as follows: Figure 1 As shown, it includes a guide pipe 3, and the number of guide pipes 3 is one or more connected end to end; one end of the guide pipe 3 is threadedly connected to an upper packer 1, and the other end is threadedly connected to a lower packer 2. The upper packer 1 is used to seal the upper end of the target well section to be sealed, and the lower packer 2 is used to seal the lower end of the target well section to be sealed.
[0018] like Figure 2 The diagram shows the structure of the upper packer 1. The upper packer 1 is formed by adding a liner to the outside of the central tube of the existing Y114 packer and adding several through holes. Specifically, it consists of the first lower connector retaining ring 11, the first lower connector 12, the first rubber sleeve retaining ring 13, the first compression ring 14, the first liner 15, the first central tube 16, the first pressure bearing cylinder 17, the first positioning ring 18, the first upper connector 19, the first side rubber sleeve 110, and the first middle rubber sleeve 111.
[0019] The inner and outer walls of one end of the first liner tube 15 are connected to the first central tube 16 and the first positioning ring 18 by threads, respectively, and the outer wall of the other end is connected to the first rubber sleeve retaining ring 13 by threads. Thus, an annular space structure—a partition tube—is formed between the first central tube 16 and the first liner tube 15. The function of the partition tube is to serve as a gas flow channel.
[0020] In addition, such as Figure 3 As shown, the first lower connector 12 is provided with several through holes that axially penetrate its sidewall (the holes are axial, in...). Figure 2 (Not visible in the image). In addition, the first compression ring 14 is provided with several first compression ring through holes 112 that penetrate its sidewall radially, and the first liner 15 is provided with several first liner through holes 113 that penetrate its sidewall radially. These through holes all serve as gas flow channels.
[0021] Thus, a complete gas flow channel is formed inside the upper packer 1. The specific flow path is as follows: the gas enters the interior of the upper packer 1 through the axial through hole of the first lower connector 12, then flows into the partition tube between the first central tube 16 and the first liner tube 15, and finally flows out of the upper packer 1 through the first compression ring through hole 112 and the first liner tube through hole 113.
[0022] like Figure 4 The diagram shows the structure of the lower packer 2. The lower packer 2 is formed by adding a liner to the outside of the central tube of the existing Y114 packer and adding several through holes. Specifically, it consists of a second upper connector 21, a second rubber sleeve retaining ring 22, a second side rubber sleeve 23, a second compression ring 24, a second liner 25, a second central tube 26, a second pressure-bearing cylinder 27, a second positioning ring 28, a second lower connector 29, a second upper connector retaining ring 210, and a second middle rubber sleeve 211. The inner and outer walls of one end of the second liner 25 are connected to the second central tube 26 and the second rubber sleeve retaining ring 22 by threads, respectively, and the outer wall of the other end is connected to the second compression ring 24 by threads. Thus, an annular space structure—a partition tube—is formed between the second central tube 26 and the second liner 25. The function of this partition tube is to serve as a gas flow channel.
[0023] In addition, such as Figure 3 As shown, the second upper connector 21 is provided with several through holes that axially penetrate its sidewall (the holes are axial, in...). Figure 4(Not visible in the image). Additionally, the second compression ring 24 has several radially penetrating second compression ring through-holes 212, and the second liner 25 has several radially penetrating second liner through-holes 213. These through-holes serve as gas flow channels. Thus, a complete gas flow channel is formed within the lower packer 2. The specific flow path is as follows: gas enters the lower packer 2 through the second compression ring through-holes 212 and the second liner through-holes 213, passes through the partition tube between the second central tube 26 and the second liner 25, and finally exits the lower packer 2 through the axial through-hole of the second upper connector 21.
[0024] like Figure 5 The diagram shows the structure of the guide tube 3, which consists of a third upper connector retaining ring 31, a third upper connector 32, an outer tube 33, an oil pipe 34, a third lower connector 35, a third lower connector retaining ring 36, and a sealing ring 37. The oil pipe 34 is threaded to both ends of the third upper connector 32 and the third lower connector 35, respectively. The other end of the third upper connector 32 is threaded to the third upper connector retaining ring 31, and the other end of the third lower connector 35 is threaded to the third lower connector retaining ring 36. A sealing ring 37 is provided between the third lower connector 35 and the third lower connector retaining ring 36. The retaining rings protect the threads of the upper and lower connectors and the sealing ring 37 during transport of the guide tube 3; both retaining rings are removed during use. The sealing ring 37 provides a seal between the two guide tubes or between the guide tube and the lower packer. Furthermore, a sealing ring 37 is also provided at the threaded part of the lower connector of the upper packer 1, providing a seal between the guide tube and the upper packer.
[0025] like Figure 3 As shown, both the third upper connector 32 and the third lower connector 35 are provided with several axial through holes penetrating their sidewalls, serving as gas flow channels. Additionally, the outer tube 33 is sleeved over the oil pipe 34, with both ends of the outer tube 33 sealed by the third upper and lower connectors via sealing rings 37. Through the cooperation of the third upper and lower connectors and the sealing rings 37, an annular space is formed between the oil pipe 34 and the outer tube 33, isolating the annular space of the oil jacket and the oil pipe, thus forming an independent flow channel to conduct the dissolved gas passing through the lower packer 2 to the diaphragm tube of the upper packer 1. The specific flow path of the gas in the flow pipe 3 is as follows: it enters the annular space between the oil pipe 34 and the outer tube 33 through the axial through hole of the third lower connector 35, and then flows out of the flow pipe 3 through the axial through hole of the third upper connector 32.
[0026] Depending on the length of the well section to be sealed, the number of guide pipes 3 can be one or more connected in series, with multiple guide pipes connected by threads.
[0027] When using this stratified oil production device, first remove all the retaining rings, then connect the first upper connector 19 of the upper packer 1 to the tubing of the oil well via threads, connect the first lower connector 12 to the third upper connector 32 of the guide pipe 3 via threads, connect the third lower connector 35 of the guide pipe 3 to the second upper connector 21 of the lower packer 2 via threads, connect multiple guide pipes 3 in series via threads, and connect the second lower connector 29 of the lower packer 2 to other downhole tubing (such as tubing, pump, slips, etc.) via threads according to the construction design requirements.
[0028] The assembly and operation process of this utility model's stratified oil recovery device is as follows: First, the tubular columns are prepared according to the construction design requirements, and the locking points of the upper and lower packers should avoid the sleeve couplings.
[0029] When completing the lowering of other downhole tubing strings and assembling and lifting this utility model device, such as Figure 1 As shown, from bottom to top, press packer 2, guide pipe 3, and upper packer 1 to connect; before hoisting, a 2-7 / 8" TBG oil pipe needs to be connected to the third upper connector 32 for hoisting.
[0030] During setting, the tubing string is raised more than 1 meter, and the support slips enter the set position. The tubing string is then lowered, and the support slips enter the set position first. Under the weight of the tubing string, the setting pins of the upper and lower packers are sheared, and the rubber sleeve is compressed, completing the packer setting. The tubing hanger is then adjusted to its preset length and set into the wellhead four-way connector, completing the packer setting.
[0031] During unsealing, the tubing is lifted, the packer extends, the rubber sleeve is released from compression, and the unsealing is completed.
[0032] During operation, the weight of the tubing compresses the rubber sleeves of the upper and lower packers, causing the outer diameter of the sleeves to expand and seal the annular space of the oil sleeve. In this operating state, the compression ring through-holes of the upper and lower packers are close to or connected to the liner through-holes, and there is also a gap between the compression ring and the liner, forming a gas passage.
[0033] Gas generated in the formation enters the lower packer 2 through the gas channel formed by the second compression ring through hole 212 and the second liner through hole 213. It flows into the axial through hole of the second upper connector 21 through the partition pipe between the second central pipe 26 and the second liner 25 and enters the guide pipe 3. It passes through the axial through hole of the third lower connector 35 of the guide pipe 3, through the gap between the oil pipe 34 and the outer pipe 33, and then sequentially through the axial through hole of the third upper connector 32 of the guide pipe 3 and the axial through hole of the first lower connector 12 of the upper packer 1 to enter the upper packer 1. It passes through the partition pipe between the first central pipe 16 and the first liner 15, and finally flows out of the upper packer 1 through the first liner through hole 113 and the first compression ring through hole 112, and enters the annular space of the oil jacket, thereby eliminating the possibility of gas lock of the oil pump.
[0034] During well washing, the washing fluid reaches the sealing layer section, passes through the liner gap of the upper packer 1, the annular space between the outer tube of the guide pipe 3 and the central oil pipe, and the liner gap of the lower packer 2, bypasses the sealing layer, and enters the lower part of the wellbore.
[0035] Example 2: This embodiment of the mechanical plugging stratified oil production device includes a guide pipe 3. One end of the guide pipe 3 is threadedly connected to an upper packer 1, and the other end is threadedly connected to a lower packer 2. All three are connected by upper and lower connectors. The upper packer 1 is used to plug the upper end of the target well section, and the lower packer 2 is used to plug the lower end of the target well section. The upper packer 1, the lower packer 2, and the guide pipe 3 are all provided with gas guiding channels, so that the dissolved gas released from the lower oil layer passes through the lower packer 2, the guide pipe 3, and the upper packer 1 in sequence into the upper oil casing annular space, and is finally discharged from the wellhead.
[0036] Example 3: Based on Embodiment 2, the upper packer 1 is an improvement on the existing Y114 packer. The specific modifications include: adding a first liner 15 outside the first central tube 16, with the inner and outer walls of one end of the first liner 15 connected to the first central tube 16 and the first positioning ring 18 respectively by threads, and the outer wall of the other end connected to the first rubber sleeve retaining ring 13 by threads; providing several through holes axially penetrating its sidewall on the first lower connector 12; providing several first compression ring through holes 112 radially penetrating its sidewall on the first compression ring 14, and providing several first liner through holes 113 radially penetrating its sidewall on the first liner 15.
[0037] Example 4: Based on embodiment 3, a sealing ring 37 is provided at the thread of the first lower connector 12 in the upper packer 1 to seal the connection between the upper packer 1 and the guide tube 3.
[0038] The lower packer 2 is an improvement on the existing Y114 packer. The specific modifications include: adding a second liner 25 outside the second central tube 26. The inner and outer walls of one end of the second liner 25 are connected to the second central tube 26 and the second rubber sleeve retaining ring 22 by threads, respectively, and the outer wall of the other end is connected to the second compression ring 24 by threads; several through holes axially penetrating its sidewall are provided on the second upper connector 21; several second compression ring through holes 212 radially penetrating its sidewall are provided on the second compression ring 24; and several second liner through holes 213 radially penetrating its sidewall are provided on the second liner 25. Example 5: Based on Example 4, the number of guide tubes 3 is one or more connected end to end.
[0039] The guide pipe 3 includes an oil pipe 34, with a third upper connector 32 and a third lower connector 35 threaded to both ends of the oil pipe 34. The third upper connector 32 and the third lower connector 35 are each provided with several through holes that axially penetrate their side walls. An outer pipe 33 is fitted over the oil pipe 34, and both ends of the outer pipe 33 are sealed by the third upper and lower connectors through sealing rings 37.
[0040] Example 6: Based on embodiment 5, the other end of the third upper connector 32 is threadedly connected to the third upper connector retaining ring 31, and the other end of the third lower connector 35 is threadedly connected to the third lower connector retaining ring 36.
Claims
1. A mechanical plugging stratified oil production device, characterized in that, The system includes a guide pipe (3), one end of which is threaded to an upper packer (1), and the other end is threaded to a lower packer (2). All three are connected by upper and lower connectors. The upper packer (1) is used to seal the upper end of the target well section, and the lower packer (2) is used to seal the lower end of the target well section. The upper packer (1), the lower packer (2), and the guide pipe (3) are all equipped with gas guide channels, so that the dissolved gas released from the lower oil layer passes through the lower packer (2), the guide pipe (3), and the upper packer (1) in sequence and enters the upper oil casing annular space, and is finally discharged from the wellhead.
2. The mechanical plugging stratified oil production device according to claim 1, characterized in that, The upper packer (1) is an improvement on the existing Y114 packer. The specific modifications include: adding a first liner (15) outside the first central tube (16). The inner and outer walls of one end of the first liner (15) are connected to the first central tube (16) and the first positioning ring (18) respectively by threads, and the outer wall of the other end is connected to the first rubber sleeve retaining ring (13) by threads; a number of through holes axially penetrating its side wall are provided on the first lower connector (12); a number of first compression ring through holes (112) radially penetrating its side wall are provided on the first compression ring (14), and a number of first liner through holes (113) radially penetrating its side wall are provided on the first liner (15).
3. The mechanical plugging stratified oil production device according to claim 2, characterized in that, A sealing ring (37) is provided at the thread of the first lower connector (12) in the upper packer (1) to seal the connection between the upper packer (1) and the guide pipe (3).
4. The mechanical plugging stratified oil production device according to claim 1, characterized in that, The lower packer (2) is an improvement on the existing Y114 packer. The specific modifications include: adding a second liner (25) outside the second central tube (26). The inner and outer walls of one end of the second liner (25) are connected to the second central tube (26) and the second rubber sleeve retaining ring (22) by threads, respectively, and the outer wall of the other end is connected to the second compression ring (24) by threads; a number of through holes axially penetrating its side wall are provided on the second upper connector (21); a number of second compression ring through holes (212) radially penetrating its side wall are provided on the second compression ring (24); and a number of second liner through holes (213) radially penetrating its side wall are provided on the second liner (25).
5. The mechanical plugging stratified oil production device according to claim 1, characterized in that, The number of the guide tubes (3) is one or more connected end to end.
6. The mechanical plugging stratified oil production device according to claim 1, characterized in that, The guide pipe (3) includes an oil pipe (34), and the two ends of the oil pipe (34) are respectively threaded to a third upper connector (32) and a third lower connector (35). The third upper connector (32) and the third lower connector (35) are each provided with several through holes that axially penetrate their side walls. The oil pipe (34) is covered with an outer pipe (33), and the two ends of the outer pipe (33) are respectively sealed by the third upper and lower connectors through sealing rings (37).
7. The mechanical plugging stratified oil production device according to claim 6, characterized in that, The other end of the third upper connector (32) is threaded with a third upper connector retaining ring (31), and the other end of the third lower connector (35) is threaded with a third lower connector retaining ring (36).
8. The mechanical plugging stratified oil production device according to claim 7, characterized in that, A sealing ring (37) is provided between the third lower connector (35) and the third lower connector retaining ring (36).