Screw pump and oil extraction equipment

Abstract

The embodiment of the invention relates to the technical field of oil extraction equipment, and particularly discloses a screw pump and oil extraction equipment, which comprise a metal oil pipe, a composite oil pipe, a throwing and fishing cable and a connecting wire. The composite oil pipe comprises a composite material layer and a wire assembly, the composite material layer wraps the wire assembly, and the wire assembly comprises at least one heating wire; the two ends of the switching assembly are connected with the metal oil pipe and the composite oil pipe correspondingly. The dropping and fishing cable is arranged in the metal oil pipe in a penetrating manner; the connecting wire is arranged in the switching assembly in a penetrating mode, and the two ends of the connecting wire are connected with the throwing and fishing cable and the wire assembly respectively. The metal oil pipe can bear high pressure and high temperature and can meet underground use requirements, the heating wire of the composite oil pipe can heat a wellhead, and wax blockage at the wellhead can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of oil production equipment, and in particular to a screw pump and oil production equipment. Background Art

[0002] As a new oil extraction technology, submersible screw pump generally includes oil pipe and screw pump unit. The oil pipe extends from the wellhead to the downhole and connects to the screw pump unit to output the well fluid extracted by the screw pump unit to the wellbore. The oil pipe is located in the downhole part and needs to withstand high temperature and high pressure. The position of the oil pipe near the wellhead is prone to wax deposition, so the oil pipe needs to adapt to various working environments. Summary of the invention

[0003] In view of the above problems, an embodiment of the present application provides a screw pump to overcome the above problems.

[0004] According to one aspect of the present application, a screw pump is provided, comprising a metal oil pipe; a composite oil pipe, the composite oil pipe comprising a composite material layer and a wire assembly, the composite material layer covering the wire assembly, the wire assembly comprising at least one heating wire; a transition assembly, the two ends of the transition assembly are respectively connected to the metal oil pipe and the composite oil pipe; a salvaging cable, the salvaging cable is passed through the metal oil pipe; and a connecting wire, the connecting wire is passed through the transition assembly, the two ends of the connecting wire are respectively connected to the salvaging cable and the wire assembly.

[0005] In an optional manner, the adapter assembly includes a first adapter tube, both ends of which are connected to the metal oil pipe and the composite oil pipe; one end of the salvage cable is disposed in the first adapter tube, and the connecting wire passes through the first adapter tube.

[0006] In an optional manner, the first transfer tube is provided with a first accommodating cavity and a connecting channel which are connected to each other, the first accommodating cavity is connected to the metal oil pipe, and the connecting channel is connected to the composite oil pipe; one end of the casting cable is arranged in the first accommodating cavity, and the connecting wire is sequentially passed through the first accommodating cavity and the connecting channel.

[0007] In an optional manner, the adapter assembly further includes a first oil pipe, one end of which is connected to the interior of the first adapter tube, and the other end of which is connected to the interior of the composite oil pipe.

[0008] In an optional manner, the adapter assembly also includes a first adapter joint, which is connected between the first adapter tube and the first oil pipe; the first adapter joint is provided with a first oil hole and a first wire hole, one end of the first oil hole and one end of the first wire hole are respectively connected to the interior of the first adapter tube, the other end of the first oil hole is connected to the first oil pipe, the other end of the first wire hole is not connected to the first oil pipe, and the connecting wire passes through the first wire hole and extends to the outside of the first oil pipe.

[0009] In an optional manner, the adapter assembly also includes a wire protection tube, which is arranged outside the first oil pipe, and a second accommodating cavity is provided between the wire protection tube and the first oil pipe; the end of the first wire hole facing away from the first adapter tube is connected to the second accommodating cavity, and the connecting wire is passed through the second accommodating cavity.

[0010] In an optional manner, the adapter assembly further includes a fixed ring block, the fixed ring block is disposed in the wire protection tube, and the fixed ring block is sleeved on the first oil pipe.

[0011] In an optional manner, a connecting portion is provided at one end of the first connecting tube away from the metal oil pipe; the connecting assembly further comprises a second connecting tube, two ends of the second connecting tube are respectively connected to the connecting portion and the first connecting joint.

[0012] In an optional manner, the adapter assembly also includes a second oil pipe and a third adapter tube, the third adapter tube is arranged outside the second oil pipe, and a third accommodating cavity is provided between the third adapter tube and the second oil pipe; one end of the second oil pipe is connected to the first oil pipe, and the other end of the second oil pipe is connected to the interior of the composite oil pipe; one end of the third adapter tube is connected to the wire protection tube, and the other end of the third adapter tube is sleeved on the composite oil pipe, the third accommodating cavity is connected to the second accommodating cavity, and the connecting wire is passed through the third accommodating cavity.

[0013] In an optional manner, the adapter assembly further includes a second adapter, one end of the second adapter is respectively connected to the first oil pipe and the wire protection tube, and the other end of the second adapter is respectively connected to the second oil pipe and a third adapter tube.

[0014] In an optional manner, the screw pump also includes a support member, both ends of which are respectively connected to the adapter assembly and the metal oil pipe, and the salvaging cable is fixed to the support member; and / or the screw pump also includes a clamping assembly, which is respectively connected to the support member and the salvaging cable.

[0015] In an optional manner, the screw pump also includes a support member and a clamping assembly, wherein two ends of the support member are respectively sleeved on the adapter assembly and the metal oil pipe, a support surface is provided in the support member facing the adapter assembly, and one end of the casting cable passes through the support member; the clamping assembly includes a clamping cylinder, a first locking cylinder and a second locking cylinder, the clamping cylinder and the first locking cylinder are respectively sleeved on the casting cable, and the first locking cylinder abuts against one end of the clamping cylinder away from the metal oil pipe, the second locking cylinder is sleeved outside the clamping cylinder and the first locking cylinder, and the second locking cylinder abuts against the support surface toward one end of the metal oil pipe; wherein the first locking cylinder and the second locking cylinder are used for the clamping cylinder so that the clamping cylinder locks the casting cable.

[0016] According to another aspect of the present application, there is provided an oil production equipment, comprising any one of the above-mentioned screw pumps.

[0017] The beneficial effects of the embodiment of the present application are as follows: Different from the prior art, the embodiment of the present application is provided with a metal oil pipe, a composite oil pipe, a transfer assembly, a fishing cable and a connecting wire. Among them, the metal oil pipe is used to dock with the screw pump unit, can withstand high pressure and high temperature, and meet the use requirements underground; the composite oil pipe includes at least one heating wire, which can heat the composite oil pipe near the wellhead to reduce the wax deposition near the wellhead, thereby ensuring the normal transportation of well fluid in the oil pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0019] Figure 1 It is a schematic diagram of the overall structure of the screw pump in the embodiment of the present application; Figure 2 It is a cross-sectional view of a part of the structure of the screw pump according to an embodiment of the present application; Figure 3 yes Figure 2 A schematic diagram of the structure enlargement in the middle; Figure 4 yes Figure 2 Enlarged schematic diagram of the structure at point B in the middle. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0022] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0023] See also Figure 1 and Figure 2 The screw pump 1000 includes a composite oil pipe 20, a metal oil pipe 30, an adapter assembly 40, a salvage cable 50, and a connecting wire 60. One end of the composite oil pipe 20 is connected to the wellhead device above the wellbore, the other end of the composite oil pipe 20 is connected to one end of the adapter assembly 40, the other end of the adapter assembly 40 is connected to the metal oil pipe 30, the adapter assembly 40 is located between the composite oil pipe 20 and the metal oil pipe 30, the salvage cable 50 is inserted into the metal oil pipe 30, the connecting wire 60 is inserted into the adapter assembly 40, the connecting wire 60 realizes electrical conduction between the salvage cable 50 and the composite oil pipe 20, and the composite oil pipe 20, the metal oil pipe 30 and the adapter assembly 40 are internally connected to each other.

[0024] For the above-mentioned composite oil pipe 20, Figure 1 and Figure 2 As shown, at least a portion of the composite oil pipe 20 extends from the wellhead into the wellbore, and the composite oil pipe 20 allows well fluid to flow.

[0025] It should be noted that the composite oil pipe 20 refers to a continuous oil pipe made of composite materials, and the composite oil pipe 20 is a non-metallic material. In some embodiments, the composite oil pipe 20 is composed of a multi-layer structure, including a polymer resin lining layer, a reinforcement layer, a tensile layer and an outer protective layer, wherein the lining layer uses a polymer resin that is anti-scaling, anti-waxing and corrosion-resistant, and the reinforcement layer and the tensile layer use high-strength fibers to provide the required mechanical strength.

[0026] In some embodiments, the composite oil pipe 20 includes a composite material layer and a wire assembly, the composite material layer covers the wire assembly, and the wire assembly includes at least one heating wire. The heating wire can be used to heat the composite oil pipe 20. In the related art, as the well fluid rises, the well fluid is prone to wax and scale on the oil pipe near the wellhead. In the present application, the heating wire is used to heat the composite oil pipe 20 near the wellhead to ensure that the temperature difference between the composite oil pipe 20 and the well fluid is within a preset range, thereby reducing the temperature difference between the composite oil pipe 20 and the well fluid. Excessive, and further reducing the well fluid due to rising close to the wellhead, reducing the wax and scale on the oil pipe of the wellhead accessories.

[0027] In some embodiments, the heating wire is arranged in a surrounding manner inside the composite oil pipe 20. This arrangement allows the inner wall of the composite oil pipe 20 to be heated evenly, thereby ensuring that the temperature that can be reached at each location on the inner wall of the composite oil pipe 20 is equal and the temperature difference between each location is small.

[0028] In some embodiments, the conductor assembly further includes a power cable, which is used to transmit electricity. The power cable can provide electricity to the submersible electric pump unit 90, thereby ensuring the normal operation of the submersible electric pump unit 90.

[0029] For the above-mentioned metal oil pipe 30 and adapter assembly 40, as Figure 1-Figure 3 As shown, the metal oil pipe 30 is connected to the composite oil pipe 20 through the adapter assembly 40, wherein one end of the adapter assembly 40 is connected to the other end of the composite oil pipe 20, and the other end of the adapter assembly 40 is connected to the metal oil pipe 30, and the adapter assembly 40 is located between the composite oil pipe 20 and the metal oil pipe 30, and the adapter assembly 40 and the metal oil pipe 30 and the composite oil pipe 20 are internally interconnected, and the composite oil pipe 20, the adapter assembly 40 and the metal oil pipe 30 are arranged in sequence in the vertical direction. It should be noted that the vertical direction refers to the direction from the wellhead to the bottom of the well.

[0030] In some embodiments, the adapter assembly 40 includes a first adapter tube 401, a second adapter tube 403, a first adapter joint 405, a first oil pipe 407, a wire protection tube 402, a second adapter joint 406, a second oil pipe 408, and a third adapter tube 404. The two ends of the first adapter tube 401 are respectively connected to the metal oil pipe 30 and the second adapter tube 403, the two ends of the first adapter joint 405 are respectively connected to the second adapter tube 403 and the first oil pipe 407, the two ends of the second adapter joint 406 are respectively connected to the first oil pipe 407 and the second oil pipe 408, the two ends of the third adapter tube 404 are respectively connected to the second adapter joint 406 and the composite oil pipe 20, and the second oil pipe 408 is also connected to the composite oil pipe 20.

[0031] In some embodiments, the first transfer tube 401 is provided with a first accommodating cavity 4011 and a connecting channel 4012 that are connected to each other. The first accommodating cavity 4011 is provided at one end of the first transfer tube 401 facing the metal oil pipe 30, and the connecting channel 4012 is provided at the other end of the first transfer tube 401. The first accommodating cavity 4011 is connected to the metal oil pipe 30, and the connecting channel 4012 is connected to the second transfer tube 403. One end of the fishing cable 50 is provided in the first accommodating cavity 4011, and the connecting wire 60 is sequentially passed through the first accommodating cavity 4011 and the connecting channel 4012 and extends into the second transfer tube 403. Among them, the well fluid inside the metal oil pipe 30 can flow into the second transfer tube 403 through the first accommodating cavity 4011 and the connecting channel 4012 in sequence.

[0032] In some embodiments, a first transfer tube 401 is provided with a transfer portion 401a at one end away from the metal oil pipe 30, and the second transfer tube 403 is connected to the transfer portion 401a, thereby realizing the connection between the first transfer tube 401 and the second transfer tube 403. It can be understood that the first transfer tube 401 may not be provided with the transfer portion 401a, and the first transfer tube 401 and the second transfer tube 403 may be connected in other ways, such as connection by using an adapter, welding, etc., which is not limited here.

[0033] In some embodiments, the adapter 401a includes a connecting section 401aa and a limiting section 401ab connected to each other, and one end of the connecting section 401aa away from the limiting section 401ab is connected to the second adapter tube 403. The outer diameter of the connecting section 401aa is smaller than the outer diameter of the limiting section 401ab, so that the limiting section 401ab is provided with a limiting step surface (not shown in the figure) at one end facing the connecting section 401aa. Among them, the connecting section 401aa is penetrated into the second adapter tube 403, and one end of the second adapter tube 403 abuts the limiting step surface. The limiting section 401ab is provided with a connecting screw hole (not shown in the figure), and the screw connection member (not shown in the figure) can pass through the connecting screw hole to connect with the second adapter tube 403, so that the first adapter tube 401 and the second adapter tube 403 are fixed. It can be understood that in some other embodiments, the limiting section 401ab and the second adapter tube can also be connected by other means, such as clamping, welding, etc., which are not limited here.

[0034] In some embodiments, a sealing groove (not shown) is provided on the outer peripheral wall of the connecting section 401aa, and a sealing ring (not shown) is provided in the sealing groove. The sealing ring is provided between the connecting section 401aa and the second transfer tube 403 to prevent well fluid leakage between the connecting section 401aa and the second transfer tube 403.

[0035] It is understandable that, in some other embodiments, the adapter assembly 40 may only include the first adapter tube 401. The two ends of the first adapter tube 401 are respectively connected to the metal oil pipe 30 and the composite oil pipe 20. One end of the fishing cable 50 is arranged in the first accommodating cavity 4011 of the first adapter tube 401, and the connecting wire 60 passes through the first accommodating cavity 4011 and the connecting channel 4012 in sequence and is connected to the composite oil pipe 20, and the well fluid in the metal oil pipe 30 can flow into the composite oil pipe 20 through the first accommodating cavity 4011 and the connecting channel 4012 in sequence.

[0036] It is understandable that in some other embodiments, the first transfer tube 401 may also be omitted, and the second transfer tube 403 is directly connected to the metal oil pipe 30 .

[0037] One end of the second transfer tube 403 away from the first transfer tube 401 is sleeved outside the first transfer joint 405. The interior of the second transfer tube 403 is connected to the interior of the first transfer joint 405 and the connecting channel 4012, respectively. The connecting wire 60 is passed through the second transfer tube 403, and the well fluid in the connecting channel 4012 can flow into the first transfer joint 405 through the second transfer tube 403.

[0038] It is understandable that, in some other embodiments, the adapter assembly 40 may only include the second adapter tube 403. The two ends of the second adapter tube 403 are respectively connected to the metal oil pipe 30 and the composite oil pipe 20, the connecting wire 60 passes through the second adapter tube 403 and is connected to the composite oil pipe 20, and the well fluid in the metal oil pipe 30 flows into the composite oil pipe 20 through the second adapter tube 403.

[0039] It is understandable that in some other embodiments, the second adapter tube 403 may be omitted, and the first adapter tube 401 is directly connected to the first adapter 405. Alternatively, both the first adapter tube 401 and the second adapter tube 403 may be omitted, and the first adapter 405 is directly connected to the metal oil pipe 30.

[0040] In some embodiments, to ensure the sealing of the connection between the second adapter tube 403 and the first adapter 405, a sealing ring 405a is provided between the second adapter tube 403 and the first adapter 405. It is understandable that in some other embodiments, the second adapter tube 403 and the first adapter 405 may not be provided with a sealing ring 405a, or other sealing structures may be provided between the second adapter tube 403 and the first adapter 405, which are not limited here.

[0041] One end of the first adapter 405 away from the second adapter tube 403 is connected to the first oil pipe 407, so that the second adapter tube 403 is connected to the first oil pipe 407. The interior of the first adapter 405 is connected to the second adapter tube 403 and the first oil pipe 407, respectively, and the well fluid in the second adapter tube 403 can flow to the first oil pipe 407 through the first adapter 405.

[0042] In some embodiments, the first adapter 405 is provided with a first oil hole 4052, and the first oil hole extends from the first adapter 405 toward one end of the second adapter tube 403 to the other end of the first adapter 405. One end of the first oil hole 4052 is connected to the interior of the second adapter tube 403, and one end of the first oil pipe 407 is inserted into the first oil hole 405 so that the other end of the first oil hole 4052 is connected to the first oil pipe 407, and the well fluid in the second adapter tube 403 can flow to the first oil pipe 407 through the first oil hole 4052.

[0043] In some embodiments, the first adapter 405 is provided with a first wire hole 4051, one end of the first wire hole 4051 is connected to the interior of the second adapter tube 403, and the other end of the first wire hole 4051 is not connected to the first oil pipe 407, so that the connecting wire 60 can pass through the first wire hole 4051 and extend to the outside of the first oil pipe 407. In the radial direction of the first oil hole 4052, the first wire hole 4051 is arranged on the outside of the first oil hole 4052, so that the first oil hole 4052 is not directly connected to the first wire hole 4051.

[0044] In some embodiments, a sealing structure (not shown) is provided in the first wire hole 4051, and the sealing structure is provided between the hole wall of the first wire hole 4051 and the connecting wire 60 to prevent the well fluid in the second transfer tube 403 from flowing out of the first wire hole 4051. The sealing structure can be a sealant, and after the connecting wire 60 passes through the first wire hole 4051, the sealant is filled into the first wire hole 4051 to form a sealing structure; or the sealing structure can also be a sealing ring, for example, a sealing ring is provided on the outer surface of the connecting wire 60, and then the connecting wire 60 equipped with the sealing ring is passed through the first wire hole 4051. Among them, the specific structure and installation method of the sealing structure can be set according to actual needs and are not limited here.

[0045] It is understandable that, in some other embodiments, the adapter assembly 40 may only include the first adapter 405. The two ends of the first adapter 405 are respectively connected to the metal oil pipe 30 and the composite oil pipe 20, the connecting wire 60 passes through the first wire hole 4051 of the first adapter 405 to connect to the composite oil pipe 20, and the well fluid in the metal oil pipe 30 flows into the composite oil pipe 20 through the first oil hole 4052.

[0046] It is understandable that, in some other embodiments, the first adapter 405 may be omitted, and the second adapter tube 403 is directly connected to the first oil pipe 407. Alternatively, the first adapter 405 and the second adapter tube 403 are both omitted, and the first adapter tube 401 is directly connected to the first oil pipe 407. Alternatively, the first adapter 405, the second adapter tube 403, and the first adapter tube 401 are all omitted, and the first oil pipe 407 is directly connected to the metal oil pipe 30.

[0047] The two ends of the first oil pipe 407 are respectively connected to the first adapter 405 and the second adapter 406, and the two ends of the wire protection tube 402 are also respectively connected to the first adapter 405 and the second adapter 406. The wire protection tube 402 is sleeved outside the first oil pipe 407, and a gap is provided between the wire protection tube 402 and the first oil pipe 407 to form a second accommodating chamber 4021. The second accommodating chamber 4021 is connected to the end of the first wire hole 4051 away from the second adapter tube 403, and the connecting wire 60 passes through the first wire hole 4051 and extends into the second accommodating chamber 4021. Among them, the wire protection tube 402 is used to protect the connecting wire 60 to prevent the connecting wire 60 from being damaged by external force. It can be understood that in some other embodiments, the wire protection tube 402 can also be omitted, or other structures can be provided to protect the connecting wire 60, which are not limited here.

[0048] In some embodiments, the adapter assembly 40 further includes a fixed ring block 409, which is disposed in the wire protection tube 402 and sleeved on the first oil pipe 407. The fixed ring block 409 can ensure the stable connection between the wire protection tube 402 and the first oil pipe 407. The fixed ring block 409 is disposed in the second accommodating cavity 4021, and the outer peripheral wall of the fixed ring block 409 abuts against the inner wall of the wire protection tube 402, and the inner peripheral wall of the fixed ring block 409 abuts against the inner peripheral wall of the first oil pipe 407, so that the wire protection tube 402 and the first oil pipe 407 are fixedly connected.

[0049] In some embodiments, the fixing ring block 409 is provided with a second wire hole (not shown), which extends from one end of the fixing ring block 40 toward the first adapter 405 to the other end of the fixing ring block 40, and is used for the connecting wire 60 to pass through.

[0050] In some embodiments, the number of the fixing ring blocks 409 is two, one of which is disposed at one end of the first oil pipe 407 facing the first adapter 405, and the other fixing ring block 409 is disposed at one end of the first oil pipe 407 facing the second adapter 406. By disposing two fixing ring blocks 409, the connection between the first oil pipe 407 and the wire protection tube 402 is more stable. It is understandable that in some other embodiments, the number of the fixing ring blocks 409 can be set according to actual needs, such as one, three, four, etc., which is not limited here.

[0051] It is understandable that in some other embodiments, the first oil pipe 407 and the wire protection pipe 402 may not be connected by the fixing ring block 409, for example, they may be connected by welding, clamping, threaded connection, flange connection, etc.; or, the two ends of the wire protection pipe 402 may be fixedly connected to the first adapter 405 and the second adapter 406 respectively, so that no connection structure is required between the wire protection pipe 402 and the first oil pipe 407. The fixing method of the wire protection pipe 402 is not limited here.

[0052] The end of the second adapter 406 facing away from the first oil pipe 407 is connected to the second oil pipe 408, so that the second oil pipe 408 is connected to the first oil pipe 407. The interior of the second adapter 406 is connected to the first oil pipe 407 and the second oil pipe 408 respectively, and the well fluid in the first oil pipe 407 can flow to the second oil pipe 408 through the second adapter 406.

[0053] In some embodiments, the second adapter 406 is provided with a second oil hole 4062, and the second oil hole 4062 extends from the second adapter 406 toward one end of the first oil pipe 407 to the other end of the second adapter 406. The two ends of the second oil hole 4062 are connected to the inside of the first oil pipe 407 and the inside of the second oil pipe 408 respectively, and the well fluid in the first oil pipe 407 can flow to the second oil pipe 408 through the second oil hole 4062. Among them, the end of the first oil pipe 407 away from the first adapter 405 is inserted into the first oil hole 4052, and the end of the second oil pipe 408 away from the composite oil pipe 20 is inserted into the first oil hole 4052, so that the second oil hole 4062 is connected to the first oil pipe 407 and the second oil pipe 408 respectively.

[0054] In some embodiments, the second adapter 406 is provided with a third wire hole 4061, one end of the third wire hole 4061 is connected to the second accommodating cavity 4021, and the connecting wire 60 sequentially passes through the second accommodating cavity 4021 and the third wire hole 4061. In particular, along the radial direction of the second oil hole 4062, the third wire hole 4061 is arranged on the outer side of the second oil hole 4062.

[0055] It is understandable that in some other embodiments, one or both of the first oil pipe 407 and the second adapter 406 may be omitted. For example, the first oil pipe 407 is omitted, and the second adapter 406 is directly connected to the first adapter 405, or the second adapter 406 is omitted, and the first oil pipe 407 is directly connected to the second oil pipe 408, or both the first oil pipe 407 and the second adapter 406 are omitted, and the second oil pipe 408 is directly connected to the first adapter 405.

[0056] One end of the second oil pipe 408 away from the second adapter 406 is inserted into the composite oil pipe 20 , and the well fluid in the second oil hole 4062 of the second adapter 406 can flow into the composite oil pipe 20 through the second oil pipe 408 .

[0057] One end of the third adapter tube 404 is sleeved outside the second adapter 406, and the other end of the third adapter tube 404 is sleeved outside the composite oil pipe 20, and the third adapter tube 404 is arranged outside the second oil pipe 408, and a gap is provided between the third adapter tube 404 and the second oil pipe 408 to form a third accommodating cavity 4041. The third accommodating cavity 4041 is connected to one end of the second wire hole 4061 away from the second accommodating cavity 4021, and the connecting wire 60 is passed through the third accommodating cavity 4041 and connected to the composite oil pipe 20.

[0058] In some embodiments, the third transfer tube 404 and the second oil pipe 408 are respectively made of metal materials to ensure the connection strength with the composite oil pipe 20. It is understandable that in some other embodiments, the third transfer tube 404 and the second oil pipe 408 can also be made of non-metallic materials, which is not limited here.

[0059] It is understandable that in some other embodiments, one or both of the second oil pipe 408 and the third transfer pipe 404 may be omitted. For example, only the second oil pipe 408 is provided, or only the third transfer pipe 404 is provided, or neither the second oil pipe 408 nor the third transfer pipe 404 is provided, and the composite oil pipe 20 is directly connected to the first oil pipe 407 and the wire protection pipe 402.

[0060] For the above-mentioned fishing cable 50 and connecting wire 60, as Figure 2-Figure 4 As shown, the salvage cable 50 is inserted into the metal oil pipe 30, the connecting wire 60 is inserted into the adapter assembly 40, the two ends of the connecting wire 60 are respectively connected to the salvage cable 50 and the wire assembly, one end of the salvage cable 50 is arranged in the first adapter tube 401, and the connecting wire 60 is inserted into the first adapter tube 401, the connecting wire 60 is used to connect the salvage cable 50 and the wire assembly, and the salvage cable 50 is connected to the submersible electric pump unit 90, so as to realize the electrical conduction between the wire assembly and the submersible electric pump unit 90. In some embodiments, one end of the salvage cable 50 is arranged in the first accommodating cavity 4011, and the connecting wire 60 is sequentially inserted into the first accommodating cavity 4011 and the connecting channel 4012.

[0061] In some embodiments, a salvage plug 501 is provided at one end of the salvage cable 50 close to the submersible electric pump unit 90. The salvage plug 501 can be used to connect the submersible electric pump unit 90 to achieve electrical connection between the submersible electric pump unit 90 and the power cable in the conductor assembly.

[0062] Based on the above embodiment, the composite oil pipe 20 includes a composite material and a wire assembly, the composite material covers the wire assembly, the wire assembly includes at least one heating wire, the two ends of the adapter assembly 40 are respectively connected to the metal oil pipe 30 and the composite oil pipe 20, the salvage cable 50 is passed through the metal oil pipe 30, the connecting wire 60 is passed through the adapter assembly 40, and the two ends of the connecting wire 60 are respectively connected to the salvage cable 50 and the wire assembly. In this way, as the well fluid rises and approaches the wellhead, since at least one heating wire is provided in the composite oil pipe 20, the heating wire can heat the composite oil pipe 20 near the wellhead, thereby ensuring that the temperature difference of the well fluid inside the composite oil pipe 20 is within a preset range, thereby reducing the waxing and scaling on the oil pipe near the wellhead due to the well fluid rising close to the wellhead, thereby reducing the blockage of the oil pipe, thereby ensuring the normal transportation of the well fluid in the oil pipe.

[0063] In some embodiments, the screw pump 1000 further includes a support member 70 and a clamping assembly 80. The two ends of the support member 70 are respectively connected to the adapter assembly 40 and the metal oil pipe 30, and the clamping assembly 80 is respectively connected to the support member 70 and the casting cable 50.

[0064] In some embodiments, the screw pump 1000 further includes a submersible electric pump unit 90, which is connected to one end of the metal oil pipe 30 away from the composite oil pipe 20, and is used to lift the crude oil in the well to the surface.

[0065] For the above-mentioned support member 70 and clamping assembly 80, as Figure 2 and Figure 4 As shown, the two ends of the support member 70 are respectively connected to the adapter assembly 40 and the metal oil pipe 30, and the fishing cable 50 is fixed to the support member 70, thereby limiting the fishing cable 50. In order to fix the fishing cable 50, the clamping assembly 80 is used to clamp the fishing cable 50, so that the fishing cable 50 is suspended and fixed on the support member 70.

[0066] In some embodiments, one end of the support member 70 is detachably connected to the first transfer tube 401 in the transfer assembly 40, and the other end of the support member 70 is detachably connected to the metal oil pipe 30. The support member 70 is disposed between the first transfer tube 401 and the metal oil pipe 30. The support member 70 is provided with an installation channel 701, which communicates the first transfer tube 401 and the metal oil pipe 30, and one end of the salvage cable 50 passes through the installation channel 701. The support member 70 can realize the connection between the first transfer tube 401 and the metal oil pipe 30, and the installation channel 701 thereon can be used to install the above-mentioned salvage cable 50. It can be understood that the detachable connection between the support member 70 and the first transfer tube 401, and the detachable connection between the support member 70 and the metal oil pipe 30 include but are not limited to screw connection, threaded connection, flange connection, snap connection, clamp connection, etc. In some embodiments, the support member 70 is provided with a plurality of well fluid channels 702 , which connect the first transfer tube 401 and the metal oil pipe 30 . The plurality of well fluid channels 702 facilitates the circulation of well fluid and increases the flow rate of well fluid.

[0067] In some embodiments, a support surface (not shown) is provided in the support member 70 toward the adapter assembly 40 , and the support surface is disposed at an end of the installation channel 701 away from the metal pipe 30 .

[0068] In some embodiments, the clamping assembly 80 includes a clamping cylinder 801, a first locking cylinder 802 and a second locking cylinder 803. The clamping cylinder 801 and the first locking cylinder 802 are respectively sleeved on the salvaging cable 50, and the first locking cylinder 802 abuts against one end of the clamping cylinder 801 facing away from the metal oil pipe 30. The second locking cylinder 803 is sleeved outside the clamping cylinder 801 and the first locking cylinder 802, and the second locking cylinder 803 abuts against the supporting surface at one end of the metal oil pipe 30. The first locking cylinder 802 and the second locking cylinder 803 are used for the clamping cylinder 801 so that the clamping cylinder 801 locks the salvaging cable 50, thereby ensuring that the salvaging cable 50 is stably suspended on the support member 70.

[0069] In some embodiments, the second locking cylinder 803 is provided with a clamping cavity 8031, the clamping cylinder 801 is installed in the clamping cavity 8031, one end of the first locking cylinder 802 is connected to the clamping cylinder 801, and the other end of the first locking cylinder 802 partially extends out of the clamping cavity 8031. In some embodiments, along the vertical direction, the inner diameter of the clamping cavity 8031 ​​gradually decreases. As the inner diameter of the clamping cavity 8031 ​​gradually decreases, the clamping cylinder 801 gradually tightens under the cooperation of the clamping cylinder 801 and the second locking cylinder 803, thereby clamping the above-mentioned casting cable 50, thereby achieving the limited fixation of the casting cable 50. In some embodiments, the clamping cavity 8031 ​​is conical, and the contact surface between the clamping cylinder 801 and the second locking cylinder 803 is a conical surface.

[0070] In some embodiments, the inner wall of the clamping tube 801 is provided with serrations 8011 , which abut against the salvaging cable 50 . The serrations 8011 can increase the friction between the salvaging cable 50 and ensure that the salvaging cable 50 is more stably limited on the support member 70 .

[0071] For the above-mentioned submersible electric pump unit 90, Figure 1 and Figure 2 As shown, the submersible electric pump unit 90 is used to lift the crude oil from the well to the surface. The submersible electric pump unit 90 is electrically connected to the power cable in the composite oil pipe 20 , and the power cable can provide electricity for the submersible electric pump unit 90 .

[0072] In some embodiments, a salvaging socket 901 is provided at one end of the submersible electric pump unit 90 close to the metal oil pipe 30. The salvaging socket 901 is detachably connected to the metal oil pipe 30. The salvaging plug 501 on the salvaging cable 50 is plugged into the salvaging socket 901. Since the salvaging cable 50 is electrically connected to the power cable in the wire assembly through the connecting wire 60, the salvaging cable 50 is electrically connected to the submersible electric pump unit 90, thereby achieving electrical conduction between the submersible electric pump unit 90 and the power cable.

[0073] In the embodiment of the present application, a metal oil pipe 30, a composite oil pipe 20, an adapter assembly 40, a fishing cable 50 and a connecting wire 60 are provided. The composite oil pipe 20 includes a composite material and a wire assembly, the composite material covers the wire assembly, the wire assembly includes at least one heating wire, the two ends of the adapter assembly 40 are respectively connected to the metal oil pipe 30 and the composite oil pipe 20, the fishing cable 50 is inserted into the metal oil pipe 30, the connecting wire 60 is inserted into the adapter assembly 40, and the two ends of the connecting wire 60 are respectively connected to the fishing cable 50 and the wire assembly. In this way, as the well fluid rises and approaches the wellhead, since at least one heating wire is provided in the composite oil pipe 20, the heating wire can heat the composite oil pipe 20 near the wellhead, thereby ensuring that the temperature difference between the well fluid inside the composite oil pipe 20 is within a preset range, thereby reducing the waxing and scaling on the oil pipe near the wellhead due to the well fluid rising close to the wellhead, so as to reduce the blockage of the oil pipe, thereby ensuring the normal transportation of the well fluid in the oil pipe.

[0074] The present application also provides an embodiment of an oil production equipment, including the above-mentioned submersible oil pump. The specific functions and structures of the submersible oil pump can be found in the above-mentioned embodiments, which will not be described in detail here.

[0075] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A screw pump, characterized in that: The screw pump comprises: Metal oil pipes; A composite oil pipe, the composite oil pipe comprising a composite material layer and a conductor assembly, the composite material layer covering the conductor assembly, the conductor assembly comprising at least one heating conductor; A transition assembly, two ends of which are respectively connected to the metal oil pipe and the composite oil pipe; A salvaging cable, the salvaging cable being passed through the metal oil pipe; A connecting wire is passed through the adapter assembly, and two ends of the connecting wire are respectively connected to the casting cable and the wire assembly.

2. The screw pump according to claim 1, characterized in that: The adapter assembly includes a first adapter tube, two ends of which are connected to the metal oil pipe and the composite oil pipe; One end of the casting cable is arranged in the first transfer tube, and the connecting wire passes through the first transfer tube.

3. The screw pump according to claim 2, characterized in that: The first transfer tube is provided with a first accommodating cavity and a connecting channel which are connected to each other, the first accommodating cavity is connected to the metal oil pipe, and the connecting channel is connected to the composite oil pipe; One end of the casting cable is arranged in the first accommodating cavity, and the connecting wire passes through the first accommodating cavity and the connecting channel in sequence.

4. The screw pump according to claim 2, characterized in that: The adapter assembly further includes a first oil pipe, one end of which is in communication with the interior of the first adapter tube, and the other end of which is in communication with the interior of the composite oil pipe.

5. The screw pump according to claim 4, characterized in that: The adapter assembly further includes a first adapter, wherein the first adapter is connected between the first adapter tube and the first oil pipe; The first adapter is provided with a first oil hole and a first wire hole, one end of the first oil hole and one end of the first wire hole are respectively connected to the interior of the first adapter tube, the other end of the first oil hole is connected to the first oil pipe, and the other end of the first wire hole is not connected to the first oil pipe, and the connecting wire passes through the first wire hole and extends to the outside of the first oil pipe.

6. The screw pump according to claim 5, characterized in that: The adapter assembly further includes a wire protection tube, which is arranged outside the first oil pipe, and a second accommodating cavity is arranged between the wire protection tube and the first oil pipe; One end of the first wire hole facing away from the first transfer tube is communicated with the second accommodating cavity, and the connecting wire passes through the second accommodating cavity.

7. The screw pump according to claim 6, characterized in that The adapter assembly further includes a fixed ring block, which is arranged in the wire protection tube and sleeved on the first oil pipe.

8. The screw pump according to claim 5, characterized in that: The end of the first transfer tube away from the metal oil pipe is provided with a transfer portion; The adapter assembly also includes a second adapter tube, two ends of which are respectively connected to the adapter portion and the first adapter.

9. The screw pump according to any one of claims 6 to 8, characterized in that: The adapter assembly further includes a second oil pipe and a third adapter pipe, wherein the third adapter pipe is arranged outside the second oil pipe, and a third accommodating chamber is arranged between the third adapter pipe and the second oil pipe; One end of the second oil pipe is connected to the first oil pipe, and the other end of the second oil pipe is connected to the interior of the composite oil pipe; One end of the third transfer tube is connected to the wire protection tube, the other end of the third transfer tube is sleeved on the composite oil pipe, the third accommodating cavity is communicated with the second accommodating cavity, and the connecting wire passes through the third accommodating cavity.

10. The screw pump according to claim 9, characterized in that The adapter assembly also includes a second adapter, one end of which is respectively connected to the first oil pipe and the wire protection tube, and the other end of which is respectively connected to the second oil pipe and a third adapter tube.

11. The screw pump according to claim 1, characterized in that: The screw pump further comprises a support member, two ends of which are respectively connected to the adapter assembly and the metal oil pipe, and the casting cable is fixed to the support member; and / or The screw pump also includes a clamping assembly, which is respectively connected to the support member and the casting cable.

12. The screw pump according to claim 1, characterized in that: The screw pump further comprises a support member and a clamping assembly, the two ends of the support member are respectively sleeved on the adapter assembly and the metal oil pipe, a support surface is provided in the support member facing the adapter assembly, and one end of the casting cable passes through the support member; The clamping assembly comprises a clamping cylinder, a first locking cylinder and a second locking cylinder, wherein the clamping cylinder and the first locking cylinder are respectively sleeved on the fishing cable, and the first locking cylinder abuts against an end of the clamping cylinder away from the metal oil pipe, and the second locking cylinder is sleeved outside the clamping cylinder and the first locking cylinder, and an end of the second locking cylinder facing the metal oil pipe abuts against the support surface; Wherein, the first locking cylinder and the second locking cylinder are used for the clamping cylinder so that the clamping cylinder locks the casting cable.

13. An oil production equipment, characterized in that: include: A screw pump as claimed in any one of claims 1 to 12.

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