CN110649423B

CN110649423B - Three-section type underwater cable passing mechanism for underground electric submersible pump

Info

Publication number: CN110649423B
Application number: CN201911175933.3A
Authority: CN
Inventors: 张鹏举; 涂林枫
Original assignee: Shanghai Linxi Intelligent Technology Co Ltd
Current assignee: Shanghai Linxi Intelligent Technology Co Ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-04-03
Anticipated expiration: 2039-11-26
Also published as: CN110649423A

Abstract

The invention relates to a three-section underground electric submersible pump underwater cable traversing mechanism, the number of contacts of the three-section underground electric submersible pump cable traversing mechanism is at least three cores, and the three-section underground electric submersible pump underwater cable traversing mechanism comprises: the bottom wet plug is fixed on the underwater oil extraction equipment; the through cable comprises a lower wet socket and an upper wet plug, the tail of the lower wet socket is hermetically connected with the tail of the upper wet plug through a hose, the hose is filled with insulating oil, and the lower wet socket is hermetically connected with the bottom wet plug; an ROV-operated wet socket sealingly connected with the upper wet plug.

Description

Three-section type underwater cable passing mechanism for underground electric submersible pump

Technical Field

The invention relates to a cable traversing mechanism, in particular to a three-section type underwater cable traversing mechanism of an underground electric submersible pump.

Background

During the exploitation process of offshore oil fields, old oil fields or low-pressure oil fields, because the pressure of oil and gas reservoirs is too low, an underwater electric submersible pump is required to be used for oil exploitation operation. The cable of the electric submersible pump is a channel for connecting a motor and a ground control system and transmitting a power link and PSI/PHD signals, is a special oil well cable with oil resistance, salt water resistance and chemical substance corrosion resistance, and works between oil casings.

The cable crossing device is a device which is arranged on an oil production wellhead of an electric submersible pump and used for penetrating through an oil pipe hanger and an upper flange and connecting the electric submersible pump with an underground power supply. The cable crossing device changes the traditional cable crossing mode and has the characteristics of good safety, high sealing performance, convenience in operation and the like. However, at present, the cable penetrator on the wellhead of the offshore oil field electric submersible pump in China is complex to install and maintain, and the development requirement of the automation level can not be met.

Disclosure of Invention

The invention mainly aims to provide a three-section type underwater cable traversing mechanism of an underground electric submersible pump, which utilizes an underwater operation robot ROV to realize underwater automatic installation and greatly improves the reliability and the assembly and maintenance efficiency of an underwater wet-type electric connector.

In order to achieve the above object, the present invention provides a three-section type downhole electrical submersible pump underwater cable traversing mechanism, the number of contacts of the three-section type downhole electrical submersible pump cable traversing mechanism is at least three cores, and the three-section type downhole electrical submersible pump underwater cable traversing mechanism comprises: the bottom wet plug is fixedly arranged on the underwater oil extraction equipment and is connected with the electric submersible pump through an armored cable; the through cable comprises a lower wet socket and an upper wet plug, the tail of the lower wet socket is hermetically connected with the tail of the upper wet plug through a hose, the hose is filled with insulating oil, and the lower wet socket is hermetically connected with the bottom wet plug; an ROV-operated wet socket sealingly connected with the upper wet plug.

Preferably, the bottom wet plug comprises an outer sleeve with a water-proof film covered on the inner wall and a bottom wet plug body abutting against one end of the outer sleeve, the bottom wet plug body is in threaded connection with the underwater oil extraction equipment through a guide mechanism and is in sealed connection with the guide mechanism, a bottom contact pin in sealed fit is axially inserted in the center of the bottom wet plug body, and one end of the bottom contact pin inserted into the bottom wet plug body is connected with the armored cable; the bottom wet plug further comprises a cable fixing frame arranged in the waterproof film, one end of the cable fixing frame is buckled on the bottom wet plug body, and the other end of the cable fixing frame is buckled on a cable protection device used for isolating the armored cable.

Preferably, the cable protection device comprises a cable locking cavity and a cable clamping body, the cable locking cavity is sleeved outside the armored cable and is sleeved with the outer sleeve, and a cable gland is sleeved at the inner side end of the cable locking cavity, which enters the outer sleeve; the outer side end of the cable locking cavity, which is exposed out of the outer sleeve, is in threaded connection with one end of the cable clamping body, and a cable clamping ring is clamped at the outer side end of the cable locking cavity.

Further preferably, the inner side of the other end of the cable clamping body is clamped with an armored cable snap ring, the cable clamping body is radially penetrated and screwed with a clamping body locking nut, and the clamping body locking nut penetrates through the cable clamping body and then abuts against the armored cable snap ring.

Further preferably, the lower wet socket comprises a lower socket body, an external water-separating sleeve and an internal water-separating sleeve which are coaxially arranged are arranged in the lower socket body, and blocking pieces are arranged at two ends of the external water-separating sleeve; a second pressure balance cavity filled with insulating oil is formed among the external water-separating sleeve, the plugging pieces at two ends and the internal water-separating sleeve, one end of the internal water-separating sleeve is hermetically connected with the plugging piece far away from the rear end of the lower socket body, a lower thimble axially penetrates through the plugging piece at the front end of the external water-separating sleeve, the lower thimble penetrates through the plugging piece at the front end into the internal water-separating sleeve, the lower thimble is respectively connected with the plugging piece and the internal water-separating sleeve in a sliding and sealing manner, a conductive element assembled with the lower thimble in a sliding manner is arranged in the internal water-separating sleeve, a bottom contact pin is abutted against the lower thimble and then pushed into the conductive element, and the other end of the conductive element passes through the internal water-separating sleeve and then is connected with an armored cable; the tail part of the lower socket body is hermetically connected with a lower hose fixing support used for fixing a hose.

Still further preferably, the lower hose fixing bracket is hermetically connected with the tail part of the lower socket body through a sealing sleeve, the hose fixing bracket comprises a hose connector, one end of the hose connector is hermetically connected with the sealing sleeve, the hose is sleeved outside the hose connector, a cable locking sleeve is arranged outside the part of the hose connected with the hose connector, the cable locking sleeve is connected with the hose connector through a locking ring, and the locking ring is in threaded connection with the hose connector.

Preferably, the upper portion wet plug includes an upper portion plug body, and the one end that lower part wet socket was kept away from to upper portion plug body alternates upper portion contact pin, and upper portion contact pin and upper portion plug body sealing connection, the other end and the upper portion hose mount sealing connection of upper portion plug body.

Preferably, the upper plug body is hermetically connected with an upper hose fixing frame through an upper sealing sleeve, the upper hose fixing frame comprises an upper hose connector, the hose is sleeved outside the upper hose connector, an upper cable locking sleeve is covered on the periphery of the part of the hose connected with the hose connector, and an upper locking ring is sleeved on the periphery of the position where the upper cable locking sleeve is connected with the upper hose connector.

Preferably, the ROV operation wet socket comprises a front shell adjacent to the upper wet plug and a tail shell screwed with the front shell, an ROV socket body is arranged in the front shell, an ROV external water-proof sleeve and an ROV internal water-proof sleeve which are coaxially arranged are arranged in the ROV socket body, a sealing piece is arranged at the position, close to the front end of the upper wet plug, of the ROV external water-proof sleeve, an ROV thimble assembled with the upper contact pin is arranged in the ROV internal water-proof sleeve in a sliding penetrating mode, one end of the ROV thimble penetrates through the sealing piece to be assembled with the upper contact pin, and the other end of the ROV thimble is connected with the ROV; an ROV operating handle is arranged on the tail shell, and the armored cable is connected with the ROV conductive element through the tail shell.

Preferably, the ROV conductive element comprises an ROV plug conductive rod, the ROV plug conductive rod is connected with the ROV thimble in a sliding manner, and an ROV conductive rod sealing sleeve is sealed outside the ROV plug conductive rod; an ROV spring is arranged in the ROV plug conducting rod.

The invention has the beneficial effects that:

according to the invention, the bottom wet plug is arranged on the oil extraction equipment, and then the bottom wet plug and the ROV operation wet socket are connected by using the through cable, so that the condition that the ROV operation wet socket is directly plugged with the bottom wet plug is avoided, the operation is simple, and the installation is convenient.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a cross-sectional view of a bottom wet plug of a three-section downhole electrical submersible pump cable traversing mechanism of the present invention;

FIG. 2 is a cross-sectional view of the lower wet socket of the crossing cable of the three-section type downhole electrical submersible pump underwater cable crossing mechanism of the present invention;

FIG. 3 is a cross-sectional view of the upper wet plug of the crossing cable of the three-section type downhole electrical submersible pump underwater cable crossing mechanism of the present invention;

FIG. 4 is a partial cross-sectional view of an ROV operated wet socket of the three-section downhole electrical submersible pump subsea cable traversing mechanism of the present invention;

FIG. 5 is a schematic view of the combination of the bottom wet plug and the lower wet socket of the underwater cable traversing mechanism of the three-section type downhole electric submersible pump according to the present invention;

FIG. 6 is a schematic overall structure diagram of a traversing cable of the three-section type underground electric submersible pump underwater cable traversing mechanism.

Description of the reference numerals

10. A hose; 20. an armored cable; 30. an underwater oil recovery device;

40. a guide mechanism; 50. a Christmas tree top device body;

100. a bottom wet plug;

102. a cable gland; 103. A seal sleeve fixing ring;

104. a water-barrier film; 105. A cable locking cavity; 106. Locking the nut;

107. an outer sleeve locking ring; 108. A cable clamping nut; 109. A cable snap ring;

110. a cable clamping body; 111. A cable-armored snap ring; 112. Clamping the body lock nut;

113. an outer sleeve; 114. A cable fixing frame; 115. A bottom wet plug body;

116. a seal screw; 117. Inserting a pin at the bottom; 118. A bottom O-shaped sealing ring;

119. a bottom pressure balance hole; 120. a first pressure balance chamber;

200. a lower wet socket;

201. the lower V-shaped front part is sealed; 202. A lower thimble; 203. A lower guide pin;

204. an external water-separating jacket; 205. A lower socket body; 206. A plug conductive rod;

207. a conductive rod sealing sleeve; 208. A spring guide rod;

210. a lower seal cartridge; 211. A lower locking ring;

212. a lower cable locking sleeve; 214. A lower retainer ring; 215. A lower seal screw;

219. a lower spring; 220. An internal water-separating jacket;

221. a lower pressure balance hole; 222. a hose connector;

230. a blocking member; 231. a second pressure balance chamber;

300. an upper wet plug;

302. an upper locking ring; 303. An upper hose fitting;

304. a sealing sleeve locking ring; 305. An upper first O-ring seal;

306. an upper seal cartridge; 307. An upper second O-ring seal; 308. An upper plug body;

309. inserting a pin O-shaped sealing ring; 310. An upper pin is inserted; 311. An upper seal screw;

312. an upper cable locking sleeve;

400. an ROV-operated wet socket;

401. v-shaped front sealing; 402. An ROV thimble; 403. An ROV guide pin;

404. an ROV socket body; 405. An ROV outer water-blocking jacket; 406. An ROV internal water-blocking jacket;

407. a ROV conducting rod sealing sleeve; 408. An ROV spring guide; 409. an ROV plug conductive rod;

410. a front housing; 411. A tail housing; 412. An ROV operating handle;

414. an ROV spring; 415. ROV pressure balance port.

Detailed Description

The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

The embodiment provides a three-section type underground electric submersible pump underwater cable traversing mechanism, the number of contacts of the three-section type underground electric submersible pump cable traversing mechanism is at least three cores, and the three-section type underground electric submersible pump underwater cable traversing mechanism comprises a bottom wet type plug 100, a traversing cable and an ROV operation wet type socket 400, wherein the traversing cable comprises a lower wet type socket 200 and an upper wet type plug 300. As shown in fig. 5, the bottom wet plug 100 is fixed to the subsea equipment 30, the lower wet socket 200 is hermetically plugged into the bottom wet plug 100, and the bottom wet plug 100 is connected to an electric submersible pump (not shown) through an armored cable. As shown in fig. 6, the penetration cable is installed on the main body 50 of the top equipment of the christmas tree, the tail of the lower wet socket 200 (the tail is one end of the lower wet socket 200, in actual operation, the end of the lower wet socket 200 that mates with the bottom wet plug 100 is called the head, and the other end is called the tail) is connected with the tail of the upper wet plug 300 (the tail is one end of the upper wet plug 300, in actual operation, the end of the upper wet plug 300 that mates with the ROV operation wet socket 400 is called the head, and the other end is called the tail) through the hose 10, and the hose 10 is filled with insulating oil, so as to realize the balance of internal and external pressure under water. The ROV-operated wet socket 400 is sealingly plugged with the upper wet plug 300.

Specifically, as shown in fig. 1, the bottom wet plug 100 is connected to an electric submersible pump (not shown) through an armored cable 20, and the bottom wet plug 100 is fixedly installed on the underwater oil production equipment 30. The bottom wet plug 100 includes an outer sleeve 113 covered with a water-stop film 104 on the inner wall and a bottom wet plug body 115 abutting against one end of the outer sleeve 113, and specifically, the bottom wet plug body 115 forms a sealing fixed connection with the outer sleeve through a sealing screw 116 to prevent seawater from entering the outer sleeve 113. The bottom wet plug body 115 is screwed with the underwater oil extraction device 30 through the guide mechanism 40, the bottom wet plug body 115 is connected with the guide mechanism 40 in a sealing manner, specifically, a plurality of sealing rings (not shown in the figure) are sleeved on the bottom wet plug body 115, the bottom wet plug body 115 is embedded into the guide mechanism 40, one end of the bottom wet plug body 115 penetrates out of the guide mechanism 40, and the sealing rings enable the bottom wet plug body 115 to be embedded into the guide mechanism 40 to form a seal, so that seawater is prevented from flowing into the underwater oil extraction device through a gap between the guide mechanism 40 and the bottom wet plug body 115. The center of the bottom wet plug body 115 is axially inserted with a bottom pin 117 in a sealing fit, and one end of the bottom pin 117 inserted into the bottom wet plug body 115 is connected with the armored cable 20, specifically, in this embodiment, the bottom pin 117 forms a sealing connection with the bottom wet plug body 115 through a bottom O-ring 118, so as to prevent seawater from entering the bottom wet plug body 115 through a connection gap between the bottom pin 117 and the bottom wet plug body 115. The bottom wet plug 100 further comprises a cable holder 114 disposed in the water-stop film 104, wherein the cable holder 114 is used for fixing the armored cable 20 and preventing the armored cable 20 from moving axially in the outer sleeve 113. One end of the cable holder 114 is fastened to the bottom wet plug body 115, and the other end of the cable holder 114 is fastened to a cable protection device (not shown) for isolating the armored cable. Specifically, the cable protection device includes a cable locking cavity 105 and a cable clamping body 110, and a cable fixing frame 114 is fastened to one end of the cable locking cavity 105. Cable locking chamber 105 is fitted over armored cable 20 and is fitted over outer sleeve 113, specifically, an outer sleeve locking ring 107 is threaded externally in the cable locking chamber 105, one end of an outer sleeve 113 abuts the outer sleeve locking ring 107, the other end of the outer sleeve 113 abuts the bottom wet plug body 115, in this way, the cable locking cavity 105 and the bottom wet plug body 115 cooperate to secure the outer sleeve 113, thereby preventing radial movement of the outer sleeve 113, and, in addition, a locking nut 106 is arranged at one end of the outer sleeve 113 sleeved with the cable locking cavity 105, the locking nut 106 is screwed with the outer sleeve 113, the locking nut 106 is abutted with the cable locking cavity 105 after penetrating through the outer sleeve 113 so as to prevent the cable locking cavity 105 from moving in the radial direction, at the same time, the tightness of the connection of outer sleeve 113 to cable locking chamber 105 is further enhanced, and lock nut 106 also serves to prevent outer sleeve 113 from moving radially. The cable gland 102 is sleeved at the inner end of the cable locking cavity 105 entering the outer sleeve 113, the cable gland 102 is fixed on the cable locking cavity 105 through the gland fixing ring 103, and the cable gland 102 can isolate seawater from entering the outer sleeve 113, so that the armored cable 20 in the outer sleeve 113 is prevented from being corroded by seawater. The outer side end of the cable locking cavity 105 exposed out of the outer sleeve 113 is in threaded connection with one end of the cable clamping body 110, the outer side end of the cable locking cavity 105 is also in threaded connection with a cable snap ring 109, meanwhile, the cable snap ring 109 is sleeved at one end of a cable clamping nut 108, the other end of the cable clamping nut 108 is provided with a plurality of teeth, and the teeth are tightly meshed outside the armored cable 20. After the cable clamp ring 109 is screwed into the cable locking chamber 105, the cable clamp nut 108 is fixed to the armored cable 20, so that the cable clamp nut 108 is only attached to the outer side of the armored cable 20, thereby preventing the armored cable 20 from moving radially and further fixing the armored cable 20. From the above, it can be seen that the cable locking cavity 105, the cable snap ring 109 and the cable clamp nut 108 constitute a first line of defense against radial movement of the armored cable 20. The inboard joint of the other end of the cable presss from both sides tight body 110 of cable has armoured cable snap ring 111, is equipped with a plurality of teeth on armoured cable snap ring 111 equally, radially link up the spiro union on the cable presss from both sides tight body 110 and has pressed from both sides tight body lock nut 112, press from both sides tight body lock nut 112 and pass behind the cable presss from both sides tight body 110 of cable and butt with armoured cable snap ring 111 to further prevent that armoured cable 20 from producing radial movement. In use, when the clamping body locking nut 112 moves downward, the clamping body locking nut 112 will press the armored cable retaining ring 111 downward, so that the teeth on the armored cable retaining ring 111 are tightly engaged with the armored cable 20, thereby achieving the purpose of locking the armored cable 20. That is, the armored cable clamp ring 111 and the clamp body lock nut 112 constitute a second line of defense against radial movement of the armored cable.

In addition, in this embodiment, the water-stop film 104, the cable locking cavity 105, the bottom wet plug body 115, the bottom contact pin 117 (the bottom contact pin 117 and the bottom wet plug body are hermetically connected by the bottom O-ring 118), and the cable sealing boot 102 together form a first pressure balance cavity 120, the first pressure balance cavity 220 is filled with insulating oil, and then the underwater pressure balance is realized through the bottom pressure balance hole 119, so as to solve the problem that the pressure bearing capacity of the bottom wet plug is limited under the large depth of seawater, and improve the underwater use depth and environmental adaptability of the bottom wet plug. Moreover, the cable fixing frame 114 is located inside the first pressure balance chamber 120, and the cable fixing frame 114 not only has the functions of fixing the cable locking chamber 105 and passing through the cable 20, but also is abutted against the waterproof film 104 by the cable fixing frame 114, so that the cable fixing frame 114 has the function of supporting the first pressure balance chamber 120.

As shown in fig. 2, the lower wet socket 200 includes a lower socket body 205, the lower socket body 205 is provided inside with an outer water-blocking jacket 204 and an inner water-blocking jacket 220 which are coaxially arranged, both ends of the outer water-blocking jacket 204 are sealingly engaged with a blocking member 230 to prevent the intrusion of seawater, and the blocking member 230 is sealingly inserted inside the lower socket body 205. A second pressure balance chamber 231 filled with insulating oil is formed among the outer water separating sleeve 204, the blocking pieces 230 at both ends and the inner water separating sleeve 220. In addition, the lower socket body 205 is provided with a lower pressure balance hole 221, and the second pressure balance cavity 231 realizes underwater pressure balance through the lower pressure balance hole 221, so that the problem that the bearing capacity of the lower wet socket 200 is limited under the large depth of seawater is solved, and the underwater use depth and underwater environmental adaptability of the lower wet socket are improved. One end of the inner water partition sleeve 220 is sealingly connected with a blocking piece 230 remote from the rear end of the lower socket body 205. The lower thimble 202 is axially inserted through a blocking piece 230 of the outer water-separating sleeve 204, which is adjacent to the front end of the lower socket body 205, the lower thimble 202 penetrates through the blocking piece 230 at the front end into the inner water-separating sleeve 220, the lower thimble 202 is respectively connected with the blocking piece 230 and the inner water-separating sleeve 220 in a sliding and sealing manner, specifically, a lower V-shaped front seal 201 is installed on the blocking piece 230, the lower thimble 202 forms a sliding and sealing connection with the blocking piece 230 through the lower V-shaped front seal 201, so that while seawater is blocked, in the process that the lower thimble 202 moves towards the inside of the lower socket body 205, the lower V-shaped front seal 201 squeezes away seawater on the exposed part of the lower thimble 202, and in order to further squeeze away seawater on the lower thimble 202, a lower V-shaped rear seal (not shown in the figure) is installed on the inner water-separating sleeve 220. A conductive element (not shown) slidably fitted with lower needle 202 is provided in inner water-separating sleeve 220, bottom pin 117 abuts lower needle 202 to push lower needle 202 into the conductive element, and lower V-shaped front seal 201 and lower V-shaped rear seal push seawater off bottom pin 117 during the process of pushing lower needle 202 into the conductive element by bottom pin 117. The other end of the conductive element passes through the inner water barrier 220 beyond the blocking member 230 and is connected to the core of the armored cable 20. Specifically, in this embodiment, the conductive element includes a conductive rod sealing sleeve 207 and a plug conductive rod 206 coaxially disposed with the internal water separating sleeve 220, one end of the internal water separating sleeve 220 is fastened to the conductive rod sealing sleeve 207, the conductive rod sealing sleeve 207 is used for fixing the plug conductive rod 206, and the plug conductive rod 206 is used for conducting electricity. The conducting rod sealing sleeve 207 is sleeved outside the plug conducting rod 206, the plug conducting rod 206 is in sliding connection with the lower thimble 202, the plug conducting rod 206 penetrates out of the conducting rod sealing sleeve 207 and then is connected with the cable core of the armored cable 20, one end of the conducting rod sealing sleeve 207 is clamped with the internal water separation sleeve 220, and the other end of the conducting rod sealing sleeve 207 penetrates out of the blocking piece 230 and is clamped with the blocking piece 230. In addition, a lower spring 219 and a spring guide rod 208 are arranged in the plug conductive rod 206, the spring guide rod 208 is screwed with the plug conductive rod 206, the lower spring 219 is sleeved on the spring guide rod 208, and the lower thimble 202 presses the lower spring 219 downwards in the process that the lower thimble 202 slides in the plug conductive rod 206, so that the lower thimble 202 keeps linear motion. Also, lower spring 219 may re-eject lower pin 202 after bottom pin 117 is disengaged from lower socket body 205. The rear portion of the lower socket body 205 is sealingly connected to a lower hose retaining bracket (not shown) for retaining the hose 10. Specifically, in the present embodiment, as shown in fig. 2, the lower hose fixing bracket is sealingly connected to the rear portion of the lower socket body 205 through a lower sealing boot 210 (the lower sealing boot 210 and the lower socket body 205 are sealingly connected by a lower sealing screw 215). The hose fixing bracket comprises a hose connector 222, one end of the hose connector 222 is hermetically connected with the lower sealing sleeve 210, the hose 10 is sleeved outside the hose connector 222, a lower cable locking sleeve 212 is arranged outside the part, connected with the hose connector 222, of the hose 10, and then the lower cable locking sleeve 212 is fixedly connected with the hose connector 222 through a lower locking ring 211. Specifically, the lower locking ring 211 is threadedly engaged with the hose connector 222, the lower locking ring 211 is fastened to the lower cable locking sleeve 212, and the lower cable locking sleeve 212 is provided with a lower stopper 214 in order to prevent the lower locking ring 211 from being separated from the lower cable locking sleeve 212. At the same time, the lower locking ring 211 tightly locks the hose 10 to the hose connector 222 by fixing the lower cable locking sleeve 212, preventing the hose 10 from being separated from the hose connector 222.

In the present embodiment, during the mating process between the bottom wet type plug 100 and the lower wet type socket 200, the guide pins 203 are provided on the lower wet type socket 200, and the grooves (not shown) are provided on the guide mechanism 40, so that the guide pins 203 and the grooves are connected in a centering manner. During mating, the bottom pin 117 of the bottom wet plug 100 contacts the lower thimble 202 of the lower wet socket 200, and then the lower spring 219 inside the lower wet socket 200 contracts until the conductive contact surface of the bottom pin 117 completely contacts the crown spring (not shown) inside the lower wet socket 200. In the process, the lower V-shaped front seal 201 of the lower wet socket 200 pushes the seawater attached to the outside of the lower ejector pins 202 and the bottom pins 117 of the bottom wet plug, so that the seawater cannot enter the lower wet socket 200. In addition, the front portion of the inner water-proof sleeve 220 of the lower wet socket 200 is also designed to be a V-shaped sealing structure (i.e., a lower V-shaped rear seal), and also plays a role of dynamic seal during the process of entering the lower thimble 202 and the bottom thimble 117, so as to serve as a second-stage water-proof barrier.

In the present embodiment, as shown in fig. 3, the upper wet type plug 300 includes an upper plug body 308, an upper pin 310 is inserted from one end of the upper plug body 308 away from one end of the lower wet type socket 200, the upper pin 310 and the upper plug body 308 are hermetically connected by a pin O-ring 309, and the other end of the upper plug body 308 is hermetically connected to an upper hose fixing frame (not shown). Specifically, the upper plug body 308 is connected with the upper hose fixing frame through an upper sealing sleeve 306 in a sealing manner, one end of the upper sealing sleeve 306 is connected with an upper second O-ring 307 in a sealing manner, the other end of the upper sealing sleeve 306 is connected with one end of the upper hose connector 303 in a sealing manner through an upper first O-ring 305, the hose 10 is sleeved on the other end of the upper hose connector 303, a cable core of the armored cable 20 penetrates through the upper hose connector 303 and then is connected with an upper contact pin 310, a sealing sleeve locking ring 304 is screwed outside the upper hose connector 303, the sealing sleeve locking ring 304 prevents the upper sealing sleeve 306 from falling off from the upper plug body 308, one end of the upper sealing sleeve 306 abuts against the upper plug body 308, and the other end of the upper sealing sleeve 306 abuts against. An upper cable locking sleeve 312 is fitted around the outer circumference of the portion of the hose 10 fitted to the upper hose connector 303, the upper cable locking sleeve 312 is fitted with the upper locking ring 302, specifically, one end of the upper locking ring 302 is screwed to the upper hose connector 303, the other end of the upper locking ring 302 is fastened to the upper cable locking sleeve 312, and an upper stopper (not shown) is provided on the upper cable locking sleeve 312 in order to prevent the upper locking ring 302 from being separated from the upper cable locking sleeve 312. .

As shown in fig. 4, the ROV-operated wet socket 400 includes a front housing 410 and a rear housing 411 adjacent to the upper wet plug 300, the front housing 410 is screwed with the rear housing 411, a coaxially disposed ROV socket body 404 is disposed in the front housing 410, a coaxially disposed ROV outer water-proof sleeve 405 is disposed in the ROV socket body 404, an ROV inner water-proof sleeve 406 is disposed in the ROV outer water-proof sleeve 405, one end of an ROV thimble 402 protrudes from one end of the ROV inner water-proof sleeve 406, the ROV thimble 402 protrudes from the ROV socket body 404, and the ROV thimble 402 and the ROV socket body 404 are sealingly connected through a sealing element, specifically, in the present embodiment, the sealing element adopts a V-shaped sealing structure, as shown in fig. 4, the sealing element in the present embodiment is a V-shaped front sealing 401. The other end of ROV thimble 402 is electrically connected to a conductive element. Specifically, the conductive element comprises an ROV plug conductive rod 409, the ROV plug conductive rod 409 and an ROV internal water-separating sleeve 406 are coaxially arranged, the ROV plug conductive rod 409 and an ROV thimble 402 form sliding connection, and an ROV conductive rod sealing sleeve 407 is sealed outside the ROV plug conductive rod 409; an ROV spring 414 is disposed in the ROV socket body 404, one end of the ROV spring 414 abuts against the ROV plug conductive rod 409, and the other end of the ROV spring 414 abuts against the ROV thimble 402. An ROV thimble 402, a V-shaped front seal 401, an ROV outer water-separating sleeve 405, and an ROV inner water-separating sleeve 406 form an ROV pressure balance cavity (not shown in the figure), the pressure balance cavity is filled with insulating oil, and then the inner pressure and the outer pressure are balanced through an ROV pressure balance hole 415. An ROV operating handle 412 is arranged on the tail shell 411, and the armored cable 20 is connected with the ROV plug conducting rod 409 through the tail shell 411.

In this embodiment, the process of mating the upper wet plug 300 and the ROV-operated wet socket 400 is similar to the process of mating the lower wet plug 100 and the lower wet socket 200, and the detailed process refers to the process of mating the lower wet plug 100 and the lower wet socket 200, which is not described again in this embodiment.

It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a syllogic downhole electrical submersible pump cable crossing mechanism under water which characterized in that, the contact quantity of syllogic downhole electrical submersible pump cable crossing mechanism is three cores at least, includes:

the bottom wet plug is fixedly arranged on the underwater oil extraction equipment and is connected with the electric submersible pump through an armored cable;

the through cable comprises a lower wet socket and an upper wet plug, the tail of the lower wet socket is hermetically connected with the tail of the upper wet plug through a hose, the hose is filled with insulating oil, and the lower wet socket is hermetically connected with the bottom wet plug;

the bottom wet plug comprises an outer sleeve and a bottom wet plug body, wherein the inner wall of the outer sleeve is covered with a waterproof film, the bottom wet plug body is abutted against one end of the outer sleeve and is in threaded connection with underwater oil extraction equipment through a guide mechanism, the bottom wet plug body is in sealed connection with the guide mechanism, a bottom contact pin in sealed fit is axially inserted in the center of the bottom wet plug body in an inserting mode, and one end, inserted into the bottom wet plug body, of the bottom contact pin is connected with the armored cable;

the bottom wet plug also comprises a cable fixing frame arranged in the waterproof membrane, one end of the cable fixing frame is buckled on the bottom wet plug body, and the other end of the cable fixing frame is buckled on a cable protection device for isolating armored cables;

the cable protection device comprises a cable locking cavity and a cable clamping body, the cable locking cavity is sleeved outside an armored cable and is sleeved with the outer sleeve, and a cable sealing sleeve is sleeved at the inner side end of the cable locking cavity, which enters the outer sleeve; the outer side end of the cable locking cavity, which is exposed out of the outer sleeve, is in threaded connection with one end of the cable clamping body, and a cable clamping ring is clamped at the outer side end of the cable locking cavity;

an armored cable snap ring is clamped on the inner side of the other end of the cable clamping body, a clamping body locking nut is radially connected to the cable clamping body in a penetrating and screwed mode, and the clamping body locking nut penetrates through the cable clamping body and then abuts against the armored cable snap ring;

the lower wet socket comprises a lower socket body, an external water isolation sleeve and an internal water isolation sleeve which are coaxially arranged are arranged in the lower socket body, and blocking pieces are arranged at two ends of the external water isolation sleeve; a second pressure balance cavity filled with insulating oil is formed among the external water-separating sleeve, the blocking pieces at two ends and the internal water-separating sleeve, one end of the internal water-separating sleeve is hermetically connected with the blocking piece far away from the rear end of the lower socket body, a lower thimble axially penetrates through the blocking piece at the front end of the external water-separating sleeve, the lower thimble penetrates through the blocking piece at the front end into the internal water-separating sleeve, the lower thimble is respectively connected with the blocking piece at the front end and the internal water-separating sleeve in a sliding and sealing manner, a conductive element assembled with the lower thimble in a sliding manner is arranged in the internal water-separating sleeve, the lower thimble is ejected into the conductive element after the bottom contact pin is abutted against the lower thimble, and the other end of the conductive element penetrates through the internal water-separating sleeve and then is connected with the armored cable; the tail part of the lower socket body is hermetically connected with a lower hose fixing bracket for fixing a hose;

an ROV-operated wet socket sealingly connected with the upper wet plug.

2. The underwater cable crossing mechanism of the three-section type downhole electric submersible pump according to claim 1, wherein the lower hose fixing support is hermetically connected with the tail of the lower socket body through a sealing sleeve, the hose fixing support comprises a hose connector, one end of the hose connector is hermetically connected with the sealing sleeve, the hose is sleeved outside the hose connector, a cable locking sleeve is arranged outside the portion, connected with the hose connector, of the hose, the cable locking sleeve is connected with the hose connector through a locking ring, and the locking ring is in threaded connection with the hose connector.

3. The underwater cable traversing mechanism for the three-section type downhole electric submersible pump according to claim 1, wherein the upper wet plug comprises an upper plug body, one end of the upper plug body, which is far away from the lower wet socket, is inserted with an upper contact pin, the upper contact pin is hermetically connected with the upper plug body, and the other end of the upper plug body is hermetically connected with an upper hose fixing frame.

4. The underwater cable traversing mechanism for the three-section type underground electric submersible pump according to claim 3, wherein the upper plug body is hermetically connected with the upper hose fixing frame through an upper sealing sleeve, the upper hose fixing frame comprises an upper hose joint, the hose is sleeved outside the upper hose joint, an upper cable locking sleeve is covered on the periphery of the part of the hose connected with the hose joint, and an upper locking ring is sleeved on the periphery of the position where the upper cable locking sleeve is connected with the upper hose joint.

5. The underwater cable traversing mechanism of the three-section type downhole electric submersible pump according to claim 1, wherein the ROV operation wet socket comprises a front shell adjacent to the upper wet plug and a tail shell screwed with the front shell, an ROV socket body is arranged in the front shell, an ROV external water-proof sleeve and an ROV internal water-proof sleeve which are coaxially arranged are arranged in the ROV socket body, a sealing element is arranged on the ROV external water-proof sleeve close to the front end of the upper wet plug, an ROV thimble assembled with the upper thimble is arranged in the ROV internal water-proof sleeve in a sliding and penetrating manner, one end of the ROV thimble penetrates through the sealing element to assemble the upper thimble, and the other end of the ROV thimble is connected with the ROV conductive element;

an ROV operating handle is arranged on the tail shell, and an armored cable is connected with the ROV conductive element through the tail shell.

6. The underwater cable traversing mechanism of the three-section type downhole electric submersible pump according to claim 5, wherein the ROV conductive element comprises an ROV plug conductive rod which is in sliding connection with the ROV thimble, and an ROV conductive rod sealing sleeve is sealed outside the ROV plug conductive rod; an ROV spring is arranged in the ROV plug conducting rod.