Cable penetrating semi-permanent packer

Abstract

The invention relates to a cable penetrating semi-permanent packer which is used for well completion of oil and gas wells. A guide pipe is sleeved in the mandrel, the lower part of the guide pipe is a cutting section, the upper part of the cutting section is provided with a force transfer mechanism, the load coupling is connected with the mandrel, the upper part of the cutting section is provided with a load bulge, the outer diameter of the load bulge is greater than the inner diameter of the mandrel, and the load bulge is arranged in an upper ring groove arranged between the mandrel and the load coupling; a load mechanism is arranged on the lower portion of the cutting section, a load sleeve is connected with a guide pipe, the upper portion of a lower connector is sleeved with the guide pipe, the outer diameter of the load sleeve is larger than the inner diameter of the upper portion of the lower connector, the lower connector is connected with a lower penetrating connector, and the load sleeve is arranged in a lower ring groove formed between the lower connector and the lower penetrating connector. The upper penetrating connector, the guide pipe and the lower penetrating connector are connected in an inserted mode through jaw mechanisms, penetrating holes are formed in the upper penetrating connector and the lower penetrating connector, guide grooves are formed in the outer wall of the guide pipe, the penetrating holes and the guide grooves are communicated end to end, and a cable penetrates through the penetrating holes and the guide grooves. The method is simple to process and low in cost.

Description

Technical Field

[0001] The invention belongs to the technical field of downhole packers for oil field development, and in particular relates to a cable-traversing semi-permanent packer for oil and gas well completion. Background Art

[0002] Among the downhole high-pressure packers, there is a type of packer called a semi-permanent packer. During the production process, this type of packer has the characteristics and performance of a permanent packer. When it needs to be removed, a cutting tool needs to be lowered to cut off the cutting section of its mandrel, and then the packer is lifted up to unseal it.

[0003] In the production string, a fixed or permanent test tool is sometimes installed under the packer for testing, and the test cable needs to be installed through the packer. The current cable passing structure of the cable packer has the problem of high processing cost. Summary of the invention

[0004] In order to solve the above technical problems, a cable-traversing semi-permanent packer was invented, which solves the problems of difficult and high cost in current technical processing.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A cable crossing semi-permanent packer comprises a core shaft and a lower joint, wherein an upper crossing joint is threadedly connected to the upper part of the core shaft; the core shaft and the lower joint are not directly connected; a guide tube is sleeved inside the core shaft, and the lower part of the guide tube is a cutting section; a force transfer mechanism is arranged at the upper part of the cutting section, and a load mechanism is arranged at the lower part of the cutting section; tooth mechanisms are arranged relatively between the upper crossing joint, the guide tube and the lower crossing joint for plugging, the upper crossing joint and the lower crossing joint are respectively provided with a crossing hole in the side wall, and a guide groove is arranged on the outer wall of the guide tube, the crossing hole and the guide groove are connected end to end, and the cable passes through them.

[0007] Preferably, the packer is a single-stage cylinder; the force transfer mechanism includes a load collar, a mandrel and a guide tube, the load collar and the mandrel are threadedly connected, a load protrusion is arranged on the upper part of the cutting section, the outer diameter of the load protrusion is larger than the inner diameter of the mandrel, an upper annular groove is arranged between the mandrel and the load collar, and the load protrusion is placed in the upper annular groove; the load mechanism includes a guide tube, a lower joint, a load sleeve and a lower through joint, the load sleeve is threadedly connected to the guide tube, the upper part of the lower joint is fitted with the guide tube, the outer diameter of the load sleeve is larger than the inner diameter of the upper part of the lower joint, the lower part of the lower joint is threadedly connected with the lower through joint, a lower annular groove is arranged between the lower joint and the lower through joint, and the load sleeve is placed in the lower annular groove. Furthermore, the guide groove has an enlarged groove width of the cutting section, the guide sleeve is placed in the widened guide groove, and the upper and lower ends of the guide sleeve are respectively overlapped with the load collar and the lower joint.

[0008] Preferably, the packer is a two-stage or higher hydraulic cylinder; the core shaft includes a center tube 2 and a center tube 1; the center tube 1 and the lower joint are not directly connected; the guide pipe includes an upper guide pipe and a lower guide pipe; the upper guide pipe is inserted into the center tube 2, and the lower guide pipe is inserted into the center tube 1; the lower guide pipe is a cutting section; the force transfer mechanism is arranged at the connection part of the center tube 2 and the center tube 1, and the force transfer mechanism includes a load coupling, the center tube 2, the center tube 1 and the lower guide pipe, the load coupling is respectively threadedly connected to the center tube 2 and the center tube 1, and a load protrusion is arranged on the upper part of the lower guide pipe, and the outer diameter of the load protrusion is larger than that of the center tube 2 and the center tube 1. The inner diameter of the first center tube is 1, an upper annular groove is arranged between the second center tube and the first center tube, and the load protrusion is placed in the upper annular groove; a load mechanism is arranged at the lower part of the lower guide tube, and the load mechanism includes a lower guide tube, a lower joint, a load sleeve and a lower through joint, the load sleeve is threadedly connected to the lower guide tube, the upper part of the lower joint is fitted with the lower guide tube, the outer diameter of the load sleeve is larger than the inner diameter of the upper part of the lower joint, the lower part of the lower joint is threadedly connected with the lower through joint, a lower annular groove is arranged between the lower joint and the lower through joint, and the load sleeve is placed in the lower annular groove; the upper guide tube and the lower guide tube are respectively provided with tooth-embedded mechanisms for insertion, and the outer walls of the upper guide tube and the lower guide tube are respectively provided with guide grooves for communication. Further, the load protrusion section of the lower guide tube is provided with an axial through hole for communication with the guide groove of the outer wall of the lower guide tube; the guide groove of the outer wall of the lower guide tube has a larger groove width at the lower section, and the guide sleeve is placed in the widened guide groove, and the upper and lower ends of the guide sleeve are respectively overlapped with the first center tube and the lower joint.

[0009] Compared with the prior art, the advantages of the present invention are:

[0010] The setting of the force transfer mechanism and the load mechanism solves the problem of force transfer between the center tube of the packer and the guide tube, and realizes the insertion of the guide tube into the core shaft to pass the cable. Such a structural design only requires drilling shorter cable passing holes in the side walls of the upper passing joint and the lower passing joint, and milling a longer cable groove on the outer wall of the guide tube. The processing technology is simple and the cost is low.

[0011] At present, the cable crossing technology for packers is to drill a cable crossing hole in the side wall of the core shaft of a single-stage hydraulic cylinder packer, and to drill a cable crossing hole in the side wall of the uppermost center tube of a two-stage or higher hydraulic cylinder packer. The cable crossing holes in these two cases are relatively long, difficult to process, and may require special machine tools, which is expensive.

[0012] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] When considered in conjunction with the accompanying drawings, the present invention can be more completely understood and many of the attendant advantages thereof can be easily known by referring to the detailed description below, but the drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0014] Figure 1 The present invention is a schematic structural diagram of a cable-traversing semi-permanent packer, which shows a single-stage hydraulic cylinder structure.

[0015] Figure 2 The present invention is a schematic structural diagram of a cable-traversing semi-permanent packer, which shows a two-stage hydraulic cylinder structure.

[0016] Figure 3 The present invention is a schematic structural diagram of a cable-traversing semi-permanent packer, which shows a three-stage hydraulic cylinder structure.

[0017] Figure 4 yes Figure 2 Enlarged view of segment A.

[0018] Figure 5 yes Figure 2 Enlarged view of segment B.

[0019] Figure 6 It is a schematic diagram of the upper guide tube structure.

[0020] Figure 7 yes Figure 6 Left side view of the upper guide tube.

[0021] Figure 8 It is a schematic diagram of the lower guide tube structure.

[0022] Fig. 9 yes Figure 8 Right side view of the lower guide tube.

[0023] Fig.10 It is a structural reference schematic diagram of the tail of the semi-permanent packer recovered by cutting the central pipe without cable penetration.

[0024] In the figure:

[0025] 1-cable, 2-lower through joint, 3-lower joint, 4-load sleeve, 5-guide sleeve, 6-load coupling, 7-mandrel, 8-guide tube, 9-upper through joint, 10-tooth mechanism,

[0026] 101-Load bulge,

[0027] 201-lower guide tube, 202-center tube 1, 203-upper guide tube, 204-center tube 2, 205-axial through hole,

[0028] 601-wedge, 602-groove, 603-guide groove,

[0029] 1001-lower cylinder sleeve, 1002-lower center pipe, 1003-lower joint, 1004-connecting ring. DETAILED DESCRIPTION

[0030] The "upper" and "lower" mentioned in the positional relationship in the specification and claims of this application are described in terms of the state of the tool when it is in use. In the accompanying drawings, seals are shown at locations where hydraulic sealing is required, and they will not be described one by one in the following description.

[0031] The Chinese patent name is "A semi-permanent packer and its unsealing and salvage tool", and the patent application number is 202223030928.3. It discloses a semi-permanent packer. This type of packer is developed on the basis of the tubing recovery type high-pressure packer. Its main technical feature is that the upper core shaft (or central tube) is sequentially equipped with an anchoring sealing mechanism of "slip cone + rubber cylinder + cone slip", and the following is a single-stage or multi-stage cylinder mechanism (or cylinder piston mechanism), and the bottom is the unsealing mechanism. The reason why it is called a semi-permanent packer is that this type of packer cannot be directly lifted up to unseal, and certain technical measures need to be taken to unseal the packer. There are currently two commonly used unsealing methods, one is to lower a special unsealing tool to unseal, and the other is to lower a cutting tool to cut off the central tube to unseal.

[0032] The tail structure of the semi-permanent packer varies with the different release methods. For the packer that is released by cutting the central pipe, its most common structure is shown in Fig.10 As shown, the lower cylinder sleeve 1001 and the lower joint 1003 are respectively threadedly connected to the connecting ring 1004, and the lower central pipe and the lower joint are directly connected by threads. To release the packer, the lower central pipe 1002 needs to be cut off first, and the connection between the lower central pipe and the lower joint needs to be disconnected.

[0033] The above is a known technology. In the following description, the specific structure of the semi-permanent packer will not be described in detail, and only the structure or components related to the crossing cable structure will be described.

[0034] Due to the long length of the packer, Figure 1-Figure 3 In the figure, the packer is cut off and the cut off part is connected with a dotted line.

[0035] Example 1

[0036] See also Figure 1As shown, this is a schematic diagram of the structure of a cable-crossing semi-permanent packer with a single-stage hydraulic cylinder mechanism of the present invention. The outer cover of the packer mandrel 7 is a common structure of a semi-permanent packer, and of course it can also be other structures not shown in the figure, such as the structure shown in the aforementioned "a semi-permanent packer and its unsealing and salvaging tool (patent application number 202223030928.3)". Except for the components related to the cable crossing structure, other structures and components are the same as the structural components of the semi-permanent packer. The different embodiments below are the same and will not be described one by one.

[0037] The upper through joint 9 is threadedly connected to the upper part of the mandrel 7; the guide tube 8 is sleeved inside the mandrel 7, and the lower part of the guide tube 8 is a cutting section. Figure 1 The Q segment is shown in .

[0038] A force transfer mechanism is arranged above the cutting section, and the force transfer mechanism comprises a load collar 6, a mandrel 7 and a guide tube 8. The load collar and the mandrel are threadedly connected. A load protrusion 101 is arranged on the outer wall of the guide tube at the upper part of the cutting section. The outer diameter of the load protrusion 101 is larger than the inner diameter of the mandrel 7. An upper annular groove is arranged between the mandrel and the load collar, and the load protrusion is placed in the upper annular groove. Through the force transfer mechanism, the force on the mandrel is transferred to the portion below the load protrusion 101 of the guide tube 8.

[0039] A load mechanism is arranged at the lower part of the cutting section, and the load mechanism includes a guide tube 8, a lower joint 3, a load sleeve 4 and a lower crossing joint 2. The load sleeve is threadedly connected to the guide tube, and the upper part of the lower joint is fitted with the guide tube. The outer diameter of the load sleeve is larger than the inner diameter of the upper part of the lower joint, and the lower part of the lower joint is threadedly connected to the lower crossing joint. A lower annular groove is arranged between the lower joint and the lower crossing joint, and the load sleeve is placed in the lower annular groove.

[0040] The core shaft 7 and the lower joint 3 are not directly connected, but the force is transferred from the core shaft to the lower joint through a force transfer mechanism and a load mechanism.

[0041] The upper through joint 9, the guide tube 8 and the lower through joint 2 are respectively provided with tooth embedding mechanisms 10 for plugging in with each other. The upper through joint and the lower through joint are respectively provided with through holes in the side walls, and the outer wall of the guide tube is provided with a guide groove. The through holes and the guide groove are connected end to end, and the cable 1 passes through them.

[0042] Example 2

[0043] Embodiment 2 is an improvement on Embodiment 1, and aims to improve the reliability of cable crossing.

[0044] While other technical features remain unchanged, the improvement is that: the width of the cutting section of the guide groove is enlarged, the guide sleeve 5 is placed in the widened guide groove, and the upper and lower ends of the guide sleeve are respectively overlapped with the load coupling 6 and the lower connector 3. In this way, when the cable 1 passes through the guide groove of the cutting section, it is constrained by the guide sleeve 5 and can pass smoothly.

[0045] Example 3

[0046] See also Figure 2 , Figure 4 and Figure 5 As shown, the packer is a two-stage hydraulic cylinder, the core shaft includes a center pipe 204 and a center pipe 1 202 , and the guide pipe includes an upper guide pipe 203 and a lower guide pipe 201 .

[0047] The upper guide tube is sleeved inside the second central tube, and the lower guide tube is sleeved inside the first central tube; the lower guide tube is a cutting section;

[0048] The force transfer mechanism is arranged at the connection part of the center tube two and the center tube one, and the force transfer mechanism includes a load coupling 6, the center tube two, the center tube one and a lower guide tube. The load coupling is respectively threadedly connected to the center tube two and the center tube one. A load protrusion 101 is arranged on the upper part of the lower guide tube. The outer diameter of the load protrusion is larger than the inner diameter of the center tube two and the center tube one. An upper annular groove is arranged between the center tube two and the center tube one, and the load protrusion is placed in the upper annular groove.

[0049] A load mechanism is arranged at the lower part of the lower guide tube 201, and the load mechanism includes a lower guide tube, a lower joint 3, a load sleeve 4 and a lower crossing joint 2. The load sleeve is threadedly connected to the lower guide tube, and the upper part of the lower joint is fitted with the lower guide tube. The outer diameter of the load sleeve is larger than the inner diameter of the upper part of the lower joint, and the lower part of the lower joint is threadedly connected to the lower crossing joint. A lower annular groove is arranged between the lower joint and the lower crossing joint, and the load sleeve is placed in the lower annular groove.

[0050] Similar to the first embodiment, the center tube 1 and the lower joint are not directly connected, but the force is transferred from the core shaft to the lower joint through the force transfer mechanism and the load mechanism.

[0051] The upper through joint 9, the upper guide tube 203, the lower guide tube 201 and the lower through joint 2 are respectively provided with tooth-embedded mechanisms for plugging in with each other, the upper through joint and the lower through joint are respectively provided with through holes in the side walls, and the outer walls of the upper guide tube and the lower guide tube are respectively provided with guide grooves, the through holes and the guide grooves are connected end to end, and the cable 1 passes through them.

[0052] Example 4

[0053] See also Figure 4 , Figure 8 and Fig. 9As shown, embodiment 4 is an improvement on embodiment 3, and aims to improve the reliability of cable crossing.

[0054] With other technical features unchanged, the improvement is that the load protrusion 101 of the lower guide tube is provided with an axial through hole 205 communicating with the guide groove on the outer wall of the lower guide tube.

[0055] Example 5

[0056] See also Figure 5 , Figure 8 As shown, Example 5 is an improvement on Example 3, and its purpose is to improve the reliability of cable crossing.

[0057] While other technical features remain unchanged, the improvement is that the width of the lower section of the guide groove 603 on the outer wall of the lower guide tube is enlarged, the guide sleeve 5 is placed in the widened guide groove, and the upper and lower ends of the guide sleeve are respectively overlapped with the central tube 202 and the lower joint 3. After the improvement, under the guidance of the guide sleeve 5, the cable will pass more smoothly.

[0058] Example 6

[0059] See also Figure 3 As shown in the figure, the packer is a three-stage hydraulic cylinder. Except for the additional hydraulic cylinder, its cable crossing structure is exactly the same as that of the two-stage hydraulic cylinder packer. Similarly, the semi-permanent packers with more hydraulic cylinders are also the same.

[0060] See also Figure 6-Figure 9 As shown, the "respectively arranged tooth-embedded mechanisms are plugged in" means that the tooth-embedded mechanism includes a wedge block 601 and a groove 602, and the wedge block and the groove on the two parts are plugged in one male and one female to form the tooth-embedded mechanism. Figure 6 The groove 602 of the middle upper guide tube is Figure 8 The wedges at the left end of the middle and lower guide tubes are inserted into each other to form a toothed mechanism. The toothed mechanism is positioned circumferentially to solve the communication between the guide groove and the through holes in the upper and lower through joints. The guide groove 603 is milled on the outer wall of the guide tube, and each cable uses one guide groove. Figure 7 Three guide grooves are shown in the figure. The specific design of the packer can be designed according to the number of crossing cables, and the number of corresponding crossing holes can be set.

[0061] Obviously, many modifications and changes made by those skilled in the art based on the purpose of the present invention belong to the protection scope of the present invention.

Claims

1. A cable-traversing semi-permanent packer, comprising a mandrel (7) and a lower connector (3), characterized in that: The upper through joint (9) is threadedly connected to the upper part of the core shaft; the core shaft and the lower joint are not directly connected; The core shaft (7) is internally sleeved with a guide tube (8), and the lower portion of the guide tube is a cutting section; A force transfer mechanism is arranged at the upper part of the cutting section, and a load mechanism is arranged at the lower part of the cutting section; The upper through-joint, the guide tube and the lower through-joint are respectively provided with tooth-embedded mechanisms (10) for plugging and connecting. The upper through-joint and the lower through-joint are respectively provided with through holes in their side walls. The outer wall of the guide tube is provided with a guide groove. The through holes and the guide groove are connected end to end, and the cable (1) passes through them.

2. A cable-traversing semi-permanent packer according to claim 1, characterized in that: The packer is a single-stage hydraulic cylinder; The force transfer mechanism comprises a load collar (6), a core shaft and a guide tube, the load collar and the core shaft are threadedly connected, a load protrusion (101) is arranged on the upper part of the cutting section, the outer diameter of the load protrusion is larger than the inner diameter of the core shaft, an upper ring groove is arranged between the core shaft and the load collar, and the load protrusion is placed in the upper ring groove; The load mechanism comprises a guide tube, a lower joint, a load sleeve (4) and a lower through joint (2); the load sleeve is threadedly connected to the guide tube, the upper part of the lower joint is fitted with the guide tube, the outer diameter of the load sleeve is larger than the inner diameter of the upper part of the lower joint, the lower part of the lower joint is threadedly connected to the lower through joint, a lower annular groove is provided between the lower joint and the lower through joint, and the load sleeve is placed in the lower annular groove.

3. A cable-traversing semi-permanent packer according to claim 2, characterized in that: The guide groove has a larger cutting section width, and the guide sleeve (5) is placed in the widened guide groove. The upper and lower ends of the guide sleeve are respectively overlapped with the load collar (6) and the lower joint (3).

4. A cable-traversing semi-permanent packer according to claim 1, characterized in that: The packer is a two-stage or more hydraulic cylinder; The core shaft comprises a second central tube (204) and a first central tube (202); the first central tube and the lower joint (3) are not directly connected; The guide tube comprises an upper guide tube (203) and a lower guide tube (201); The upper guide tube is sleeved inside the second central tube, and the lower guide tube is sleeved inside the first central tube; the lower guide tube is a cutting section; The force transfer mechanism is arranged at the connection part of the center tube 2 and the center tube 1, and comprises a load collar (6), the center tube 2, the center tube 1 and a lower guide tube, the load collar is respectively connected with the center tube 2 and the center tube 1 by threads, a load protrusion (101) is arranged on the upper part of the lower guide tube, the outer diameter of the load protrusion is larger than the inner diameter of the center tube 2 and the center tube 1, an upper ring groove is arranged between the center tube 2 and the center tube 1, and the load protrusion is placed in the upper ring groove; A load mechanism is arranged at the lower part of the lower guide pipe, the load mechanism comprising a lower guide pipe, a lower joint, a load sleeve (4) and a lower through joint (2), the load sleeve is threadedly connected to the lower guide pipe, the upper part of the lower joint is fitted with the lower guide pipe, the outer diameter of the load sleeve is larger than the inner diameter of the upper part of the lower joint, the lower part of the lower joint is threadedly connected to the lower through joint, a lower annular groove is arranged between the lower joint and the lower through joint, and the load sleeve is placed in the lower annular groove; The upper guide tube and the lower guide tube are respectively provided with tooth embedding mechanisms to be plugged in, and the outer walls of the upper guide tube and the lower guide tube are respectively provided with guide grooves to communicate with each other.

5. A cable-traversing semi-permanent packer according to claim 4, characterized in that: The load protrusion (101) section of the lower guide tube is provided with an axial through hole (205) which communicates with the guide groove on the outer wall of the lower guide tube.

6. A cable-traversing semi-permanent packer according to claim 4, characterized in that: The guide groove on the outer wall of the lower guide pipe has a larger groove width at the lower section, and the guide sleeve (5) is placed in the widened guide groove, and the upper and lower ends of the guide sleeve are respectively overlapped with the center pipe 1 and the lower joint.

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