A kind of underground eccentric quick docking device

Abstract

The present invention relates to the technical field of intelligent completion of petroleum exploitation, and specifically to an eccentric quick docking device downhole, comprising an upper plug-in assembly and a lower tie-back assembly, wherein the upper plug-in assembly comprises a lifting pup joint, a winding mandrel, a locking shaft, a sealing rod, an anchoring assembly and a guide shoe, a first joint fixing assembly fixedly arranged on the lifting pup joint, a pipeline guide assembly fixedly arranged on the locking shaft, a prefabricated pipeline wound on the winding mandrel, and a lower tie-back assembly comprising a guide sleeve, one end of which is sleeved on the guide shoe and the other end is fixedly connected with a second joint fixing assembly, a sealing cylinder, one end of which is fixedly connected with the second joint fixing assembly and the other end is threadedly connected with an anchoring cylinder. The present invention can not only meet the lower completion filling and sand prevention operation, but also effectively communicate the upper and lower completion systems, and effectively connect and separate the downhole production fluid control system, the downhole dynamic monitoring and signal transmission system and the ground remote control system.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent well completion for petroleum exploitation, and in particular to an underground eccentric quick docking device. Background Art

[0002] With the advancement of technology, intelligent completion technology is becoming more and more common. Intelligent completion tools are generally controlled by electronics, hydraulics or a combination of both. The pipe string is connected to cables and / or hydraulic control pipelines from the downhole tool to the ground.

[0003] In order to achieve electronic and hydraulic connection, the completion string is generally integrated. When the string needs to be pulled out, the entire string is pulled out together. If a connection mechanism is designed to separate the entire string from a certain node, when the string needs to be pulled out, only the upper string of the mechanism is pulled out. When the string needs to be lowered, the mechanism can still connect the ground control system to the lower string through cables and / or hydraulic control pipelines, which will greatly improve the operating efficiency and reduce the operating cost. Therefore, the design of such a connection mechanism is of great significance. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an underground eccentric quick docking device to solve the problems raised in the above background technology.

[0005] Based on the above purpose, the present invention provides an underground eccentric quick docking device, including an upper plug-in assembly and a lower tie-back assembly, wherein the upper plug-in assembly includes:

[0006] A lifting nipple, one end of which is threadedly connected to a winding mandrel;

[0007] A first joint fixing assembly, fixedly mounted on the lifting short section;

[0008] A locking shaft, one end of which is threadedly connected to the winding core shaft, and the other end of which is threadedly connected to a sealing rod;

[0009] A pipeline guide assembly, fixedly mounted on the locking shaft;

[0010] A prefabricated pipeline is wound on the winding mandrel, one end of the prefabricated pipeline is electrically connected to the joint on the first joint fixing assembly, and the other end passes through the pipeline guide assembly;

[0011] An anchoring assembly, one end of which is fixedly connected to the sealing rod, and the other end of which is fixedly connected to a guide shoe;

[0012] The lower tieback assembly comprises:

[0013] A guide sleeve, one end of which is sleeved on the guide shoe, and the other end of which is fixedly connected with a second joint fixing assembly;

[0014] A sealing cylinder has one end fixedly connected to the second joint fixing assembly and the other end threadedly connected to an anchor cylinder, and the anchor cylinder cooperates with the anchor assembly to complete the anchoring work of the upper plug-in assembly and the lower tie-back assembly.

[0015] Preferably, the first joint fixing assembly comprises:

[0016] A locking ring, which is sleeved on the lifting short section, and the locking ring is fixedly connected to the lifting short section;

[0017] The retaining ring is composed of two half rings, and the retaining ring is installed on the lifting short section;

[0018] The hub is sleeved on the lifting short section. The end of the hub away from the winding core shaft presses the retaining ring and is threadedly connected with the locking ring. The hub has multiple long and short grooves for installing and fixing cable connectors or hydraulic control pipeline connectors, and one end of the prefabricated pipeline is placed in the long and short grooves.

[0019] Preferably, an outer shield is sleeved on the winding core shaft, one end of the outer shield is fixedly connected to the hub via a first screw, and the prefabricated pipeline is arranged inside the outer shield.

[0020] Preferably, the pipeline guide assembly comprises:

[0021] A rotating seat, sleeved on the locking shaft, provided with at least one eccentric docking hole and at least one guide groove, the end of the prefabricated pipeline away from the lifting nipple is placed in the eccentric docking hole, and the guide groove is used for auxiliary guidance during docking;

[0022] an anti-rotation groove, arranged on the locking shaft;

[0023] A wave spring is arranged between the locking shaft and the rotating seat, and the wave spring is used to play a buffering role during docking;

[0024] A sliding key is fixed to the rotating seat by a second screw, and the sliding key and the eccentric docking hole of the rotating seat are symmetrically distributed;

[0025] An elastic key is located in the anti-rotation groove on the locking shaft, and the sliding key presses the elastic key;

[0026] A switch is mounted on the rotating seat, and the elastic key presses the switch;

[0027] The upper pressing block is fixed on the rotating seat, and the upper pressing block is used for auxiliary fixing of the wet cable joint or hydraulic joint that needs to be butted.

[0028] Preferably, a plurality of sealing rings are provided on the sealing rod, and a spacer ring is provided between each of the sealing rings.

[0029] Preferably, the anchoring assembly includes an anchoring seat, which is threadedly connected to the sealing rod, and a locking claw is threadedly provided on the anchoring seat. The locking claw is a petal-shaped elastic claw, which is used to cooperate with the anchoring tube to complete the anchoring work of the upper plug-in assembly and the lower reconnection assembly.

[0030] Preferably, the guide sleeve is provided with a guide key, a track groove and a drain hole, the guide key is fixedly connected to the guide sleeve by a third screw, and the track groove and the drain hole are symmetrically distributed.

[0031] Preferably, the second joint fixing assembly includes a joint seat, a pressing block and a positioning block, one end of the joint seat is threadedly connected to the guide sleeve, and the other end is threadedly connected to the sealing tube, the joint seat is provided with an eccentric fixing hole for fixing a wet cable joint or a hydraulic joint that needs to be connected, the pressing block and the positioning block are respectively fixed to the joint seat by a fourth screw, and the pressing block is used to assist in fixing the wet cable joint or the hydraulic joint that needs to be connected.

[0032] The beneficial effects of the present invention are as follows: the lower tieback assembly is connected to the top of the sand control pipe string or the intelligent mining pipe string, the upper plug-in assembly is connected to the bottom of the upper completion pipe string, and after being lowered into place, it is automatically docked with the lower tieback assembly. When the upper plug-in assembly is lowered, the elastic key is seated in the anti-rotation groove on the locking shaft, and the rotating seat is locked and cannot rotate; when the upper plug-in assembly is lowered into place, the guide shoe first enters the guide sleeve of the lower tieback assembly and continues to descend. When the sliding key contacts the guide sleeve, the switch is pressed by the guide sleeve, and the switch lifts the elastic key to unlock the rotating seat, and the sliding key will move along the guide sleeve. The track groove slides and continues to descend, and the guide key coincides with the guide groove, assisting the wet cable connector or hydraulic connector that needs to be docked to complete the eccentric docking downhole; at this time, the eccentric docking hole and the eccentric fixing hole are completely coaxial; at this time, the sealing ring completes the sealing in the sealing tube; at this time, the locking claw completes the anchoring in the anchoring tube, so that the upper plug-in assembly and the lower tie-back assembly can complete the automatic connection work. The present invention can not only meet the lower completion filling and sand prevention operations, but also effectively communicate the upper and lower completion systems, and effectively connect and separate the downhole production fluid control system, the downhole dynamic monitoring and signal transmission system and the ground remote control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1It is a schematic structural diagram of the first part of the upper plug assembly of an embodiment of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the second part of the upper plug assembly according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of a rotating seat according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic structural diagram of a locking shaft according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of a switch according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic structural diagram of a locking claw according to an embodiment of the present invention;

[0040] Figure 7 It is a schematic diagram of the first part of the structure of the lower tieback assembly according to an embodiment of the present invention;

[0041] Figure 8 It is a schematic diagram of the second part of the structure of the lower tieback assembly according to an embodiment of the present invention;

[0042] Fig. 9 This is a schematic structural diagram of a guide sleeve according to an embodiment of the present invention;

[0043] Fig.10 This is a schematic structural diagram of a connector base according to an embodiment of the present invention;

[0044] Fig.11 This is a schematic diagram of the structure of a positioning block according to an embodiment of the present invention;

[0045] Fig.12 It is a schematic diagram of the assembly of the upper plug-in assembly and the lower tie-back assembly according to an embodiment of the present invention.

[0046] The markings in the figure are:

[0047] 100, upper plug assembly; 101, lifting short section; 102, locking ring; 103, retaining ring; 104, hub; 105, winding mandrel; 106, outer shield; 107, first screw; 108, rotating seat; 1081, eccentric docking hole; 1082, guide groove; 109, locking shaft; 1091, anti-rotation groove; 110, sliding key; 111, elastic key; 112, switch; 113, upper pressure block; 114, sealing rod; 115, sealing ring; 116, Spacer ring; 117, locking claw; 118, anchor seat; 119, guide shoe; 120, prefabricated pipeline; 121, second screw; 122, wave spring; 200, lower return assembly; 201, guide sleeve; 2011, track groove; 2012, drain hole; 202, guide key; 203, joint seat; 2031, eccentric fixing hole; 204, sealing cylinder; 205, anchor cylinder; 206, lower pressure block; 207, third screw; 208, fourth screw; 209, positioning block. DETAILED DESCRIPTION

[0048] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0049] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] like Figures 1 to 12 As shown, a downhole eccentric quick docking device includes an upper plug-in assembly 100 and a lower tie-back assembly 200, wherein the upper plug-in assembly 100 includes:

[0051] A lifting nipple 101, one end of which is threadedly connected to a winding mandrel 105;

[0052] A first joint fixing assembly, fixed on the lifting short section 101;

[0053] A locking shaft 109, one end of which is threadedly connected to the winding mandrel 105, and the other end of which is threadedly connected to a sealing rod 114;

[0054] A pipeline guide assembly, fixed on the locking shaft 109;

[0055] A prefabricated pipeline 120 is wound on the winding mandrel 105, one end of the prefabricated pipeline 120 is electrically connected to the joint on the first joint fixing assembly, and the other end passes through the pipeline guide assembly;

[0056] An anchor assembly, one end of which is fixedly connected to the sealing rod 114, and the other end of which is fixedly connected to the guide shoe 119;

[0057] The lower tieback assembly 200 comprises:

[0058] A guide sleeve 201, one end of which is sleeved on the guide shoe 119, and the other end of which is fixedly connected with a second joint fixing assembly;

[0059] The sealing cylinder 204 has one end fixedly connected to the second joint fixing assembly and the other end threadedly connected with an anchoring cylinder 205, and the anchoring cylinder 205 cooperates with the anchoring assembly to complete the anchoring work of the upper plug-in assembly 100 and the lower reconnection assembly 200.

[0060] As an optional embodiment, the first joint fixing assembly includes:

[0061] A locking ring 102 is sleeved on the lifting sub 101, and the locking ring 102 is fixedly connected to the lifting sub 101;

[0062] The retaining ring 103 is composed of two half rings and is installed on the lifting sub 101;

[0063] The hub 104 is sleeved on the lifting short section 101, and one end of the hub 104 away from the winding core shaft 105 presses the retaining ring 103 and is threadedly connected to the locking ring 102. The hub 104 has a plurality of long and short grooves for installing and fixing cable connectors or hydraulic control pipeline connectors, and one end of the prefabricated pipeline 120 is placed in the long and short grooves.

[0064] As an optional embodiment, an outer shield 106 is sleeved on the winding core shaft 105 , one end of the outer shield 106 is fixedly connected to the hub 104 via a first screw 107 , and the prefabricated pipeline 120 is arranged inside the outer shield 106 .

[0065] As an optional embodiment, the pipeline guiding assembly includes:

[0066] A rotating seat 108 is sleeved on the locking shaft 109. The rotating seat 108 is provided with at least one eccentric docking hole 1081 and at least one guide groove 1082. One end of the prefabricated pipeline 120 away from the lifting nipple 101 is placed in the eccentric docking hole 1081, and the guide groove 1082 is used for auxiliary guidance during docking.

[0067] An anti-rotation groove 1091 is provided on the locking shaft 109;

[0068] A wave spring 122 is disposed between the locking shaft 109 and the rotating seat 108, and the wave spring 122 is used to play a buffering role during docking;

[0069] The sliding key 110 is fixed to the rotating seat 108 by a second screw 121, and the sliding key 110 and the eccentric docking hole 1081 of the rotating seat 108 are symmetrically distributed;

[0070] The elastic key 111 is located in the anti-rotation groove 1091 on the locking shaft 109, and the sliding key 110 presses the elastic key 111;

[0071] The switch 112 is mounted on the rotating seat 108, and the elastic key 111 presses the switch 112;

[0072] The upper pressing block 113 is fixed on the rotating seat 108, and the upper pressing block 113 is used to assist in fixing the wet cable connector or hydraulic connector that needs to be connected.

[0073] As an optional embodiment, a plurality of sealing rings 115 are disposed on the sealing rod 114 , and a spacer ring 116 is disposed between each of the sealing rings 115 .

[0074] As an optional embodiment, the anchoring assembly includes an anchoring seat 118, which is threadedly connected to the sealing rod 114. A locking claw 117 is threadedly connected to the anchoring seat 118. The locking claw 117 is a petal-shaped elastic claw, which is used to cooperate with the anchoring tube 205 to complete the anchoring work of the upper plug-in assembly 100 and the lower reconnection assembly 200.

[0075] As an optional embodiment, the guide sleeve 201 is provided with a guide key 202, a track groove 2011 and a drain hole 2012, the guide key 202 is fixedly connected to the guide sleeve 201 by a third screw 207, and the track groove 2011 and the drain hole 2012 are symmetrically distributed.

[0076] As an optional embodiment, the second joint fixing assembly includes a joint seat 203, a pressing block 206 and a positioning block 209. One end of the joint seat 203 is threadedly connected to the guide sleeve 201, and the other end is threadedly connected to the sealing tube 204. The joint seat 203 is provided with an eccentric fixing hole 2031 for fixing a wet cable joint or a hydraulic joint that needs to be connected. The pressing block 206 and the positioning block 209 are respectively fixed to the joint seat 203 by a fourth screw 208. The pressing block 206 is used to assist in fixing the wet cable joint or the hydraulic joint that needs to be connected.

[0077] After the connection is in place, the track groove 2011 and the eccentric fixing hole 2031 need to be adjusted to be symmetrically distributed, and the positioning block 209 needs to be installed. The fourth screw 208 fixes the positioning block 209, and the guide key 202 is installed in the guide sleeve 201 for auxiliary guidance during docking.

[0078] The main working principle of the present invention is as follows:

[0079] When the upper plug assembly 100 is lowered, the elastic key 111 is seated in the anti-rotation groove 1091 on the locking shaft 109, and the rotating seat 108 is locked and cannot rotate; when the upper plug assembly 100 is lowered into place, the guide shoe 119 first enters the guide sleeve 201 of the lower return assembly 200 and continues to descend. When the sliding key 110 contacts the guide sleeve 201, the switch 112 is pressed by the guide sleeve 201 at this time, and the switch 112 lifts the elastic key 111 to unlock the rotating seat 108, and the sliding key 110 slides along the track groove 2011 of the guide sleeve 201 and continues to descend. The guide key 202 and the guide groove 108 2 overlaps, assisting the wet cable connector or hydraulic connector that needs to be connected to complete the eccentric connection downhole; at this time, the eccentric connection hole 1081 is completely coaxial with the eccentric fixing hole 2031; at this time, the sealing ring 115 completes the sealing in the sealing tube 204; at this time, the locking claw 117 completes the anchoring in the anchor tube 205, so that the upper plug assembly 100 and the lower back connection assembly 200 complete the automatic connection work. The present invention can not only meet the lower completion filling and sand prevention operation, but also effectively communicate the upper and lower completion systems, and effectively connect and separate the downhole production fluid control system, the downhole dynamic monitoring and signal transmission system and the ground remote control system.

[0080] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An underground eccentric quick docking device, comprising an upper plug-in assembly (100) and a lower tie-back assembly (200), characterized in that: The upper plug-in assembly (100) comprises: A lifting nipple (101) having one end threadedly connected to a winding mandrel (105); A first joint fixing assembly, fixedly mounted on the lifting short section (101); A locking shaft (109), one end of which is threadedly connected to the winding core shaft (105) and the other end of which is threadedly connected to a sealing rod (114); A pipeline guide assembly, fixedly mounted on the locking shaft (109); A prefabricated pipeline (120) is wound on the winding mandrel (105), one end of the prefabricated pipeline (120) is electrically connected to the joint on the first joint fixing assembly, and the other end passes through the pipeline guide assembly; An anchoring assembly, one end of which is fixedly connected to the sealing rod (114) and the other end of which is fixedly connected to a guide shoe (119); The lower tieback assembly (200) comprises: A guide sleeve (201), one end of which is sleeved on the guide shoe (119) and the other end of which is fixedly connected to a second joint fixing assembly; A sealing cylinder (204), one end of which is fixedly connected to the second joint fixing assembly, and the other end of which is threadedly connected to an anchor cylinder (205), and the anchor cylinder (205) cooperates with the anchor assembly to complete the anchoring work of the upper plug-in assembly (100) and the lower tie-back assembly (200); The pipeline guide assembly comprises: a rotating seat (108) sleeved on the locking shaft (109), the rotating seat (108) being provided with at least one eccentric docking hole (1081) and at least one guide groove (1082), the end of the prefabricated pipeline (120) away from the lifting short section (101) being placed in the eccentric docking hole (1081), and the guide groove (1082) being used for auxiliary guidance during docking; An anti-rotation groove (1091) is provided on the locking shaft (109); A wave spring (122) is arranged between the locking shaft (109) and the rotating seat (108), and the wave spring (122) is used to play a buffering role during docking; A sliding key (110) is fixed to the rotating seat (108) by a second screw (121), and the sliding key (110) and the eccentric docking hole (1081) of the rotating seat (108) are symmetrically distributed; An elastic key (111) is seated in an anti-rotation groove (1091) on the locking shaft (109), and the sliding key (110) presses the elastic key (111); A switch (112) is mounted on the rotating seat (108), and the elastic key (111) presses the switch (112); An upper pressing block (113) is fixedly mounted on the rotating seat (108), and the upper pressing block (113) is used to assist in fixing a wet cable connector or a hydraulic connector that needs to be butted; The guide sleeve (201) is provided with a guide key (202), a track groove (2011) and a drainage hole (2012); the guide key (202) is fixedly connected to the guide sleeve (201) via a third screw (207); and the track groove (2011) and the drainage hole (2012) are symmetrically distributed.

2. The underground eccentric quick docking device according to claim 1, characterized in that: The first joint fixing assembly comprises: A locking ring (102) is sleeved on the lifting short section (101), and the locking ring (102) is fixedly connected to the lifting short section (101); The retaining ring (103) is composed of two half rings, and the retaining ring (103) is installed on the lifting short section (101); The hub (104) is sleeved on the lifting short section (101), and one end of the hub (104) away from the winding core shaft (105) presses the retaining ring (103) and is threadedly connected to the locking ring (102). The hub (104) has a plurality of long and short grooves for installing and fixing cable connectors or hydraulic control pipeline connectors, and one end of the prefabricated pipeline (120) is placed in the long and short grooves.

3. The underground eccentric quick docking device according to claim 2, characterized in that: An outer shield (106) is sleeved on the winding core shaft (105), one end of the outer shield (106) is fixedly connected to the hub (104) via a first screw (107), and the prefabricated pipeline (120) is arranged inside the outer shield (106).

4. The underground eccentric quick docking device according to claim 1, characterized in that: A plurality of sealing rings (115) are provided on the sealing rod (114), and a spacer ring (116) is provided between each of the sealing rings (115).

5. The underground eccentric quick docking device according to claim 1, characterized in that: The anchoring assembly comprises an anchoring seat (118), the anchoring seat (118) being threadedly connected to the sealing rod (114), the anchoring seat (118) being threadedly connected with a locking claw (117), the locking claw (117) being a petal-shaped elastic claw, and being used to cooperate with an anchoring tube (205) to complete the anchoring work of the upper plug-in assembly (100) and the lower tie-back assembly (200).

6. The underground eccentric quick docking device according to claim 1, characterized in that: The second joint fixing assembly comprises a joint seat (203), a pressing block (206) and a positioning block (209); one end of the joint seat (203) is threadedly connected to the guide sleeve (201), and the other end is threadedly connected to the sealing cylinder (204); an eccentric fixing hole (2031) is provided on the joint seat (203) for fixing a wet cable joint or a hydraulic joint that needs to be butted; the pressing block (206) and the positioning block (209) are respectively fixed to the joint seat (203) by a fourth screw (208); and the pressing block (206) is used to assist in fixing the wet cable joint or the hydraulic joint that needs to be butted.

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