Steel coiled tubing downhole cable passing bypass nipple

Abstract

The present invention is a steel continuous pipe downhole cable crossing bypass short section, comprising an outer tube, wherein the outer tube has a central channel, an eccentric channel and an oblique channel. An upper rosette and a lower rosette are arranged in the central channel, and both the upper rosette and the lower rosette have a central hole through which the cable can pass, and a plurality of oil holes arranged around the central hole. A slip connector is connected between the upper rosette and the lower rosette, and the inner diameter of the slip connector is arranged opposite to the central hole and can allow the cable to pass through. The slip connector has a slip that can contract radially and has teeth on the inner wall, and the slip is arranged in a contracted state and the teeth can bite the cable. The present invention can simultaneously meet the functions of fixing, sealing and crossing bypass of downhole cables, and can ensure the flow path, and has a simple structure and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of oil production or operation of steel coiled pipe with built-in cable, and in particular to a steel coiled pipe underground cable crossing bypass short section. Background Art

[0002] As the mainstream form of transportation tools in oil and gas production construction and operations, coiled tubing has been widely used in various oil and gas wells. In visual logging and coiled tubing oil production operations, it is necessary to connect the power cable and signal cable from the wellhead to the submersible electric pump underground. The traditional rodless oil production method directly connects to the electric submersible pump by bundling cables outside the pipe, and the cables are easily damaged. Under the current coiled tubing technology, the cables are in the form of internal cables. With the maturity of oil well cable technology, the safety of the cables is greatly guaranteed. However, unlike internal cables, submersible electric pumps need to be crossed underground, and correspondingly, bypass tools need to be passed through and the cables need to be suspended and sealed.

[0003] At present, there are mainly the following patents on cable crossing: one is a Chinese utility model patent with authorization announcement number CN210948537U and authorization announcement date July 7, 2020, which completes fixation and limitation through pull ropes and positioning grooves; the Chinese utility model patent with authorization announcement number CN 210866621 U and authorization announcement date June 26, 2020, adopts pin connection and double sealing; the Chinese utility model patent with authorization announcement number CN208461432U and authorization announcement date February 1, 2019, is sealed by copper balls. However, these methods only propose solutions for the sealing and suspension of cables, and the manufacturing cost is high. It is difficult to ensure the diameter of the pipeline when the space is limited. One is a Chinese utility model patent with authorization announcement number CN202850883U and authorization announcement date April 3, 2013, which provides a downhole cable bypass joint device. The device has a simple and compact structure, but lacks sealing measures, and the surrounding air and liquid are easy to enter the interior. One is a Chinese invention patent with publication number CN 111326865 A and publication date June 23, 2020, which completes the connection function of the power cable, but it is difficult to ensure the diameter of the pipeline after the connection method is installed in the tool; the Chinese utility model patent with authorization announcement number CN 204827415 U and authorization announcement date December 2, 2015 completes the cable crossing and sealing, but lacks a cable fixing mechanism, and the cable is prone to shaking in the tool, affecting the service life of the cable. None of the above patents can simultaneously meet the fixing, sealing, and crossing bypass functions of downhole cables. In addition, the existing patent structure is relatively complex, and the manufacturing and installation costs are high.

[0004] In order to meet the needs of oil production and operation of steel coiled tubing with built-in cables, it is necessary to realize the function of the cable passing through the inside of the oil pipe and connecting with the lead cable of the electric pump after bypass crossing. At the same time, the cable also needs to be fixed downhole. At present, there is a lack of corresponding devices or tools and supporting sealing methods.

[0005] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a steel continuous pipe downhole cable crossing bypass short section to overcome the defects of the prior art. Summary of the invention

[0006] The object of the present invention is to provide a steel coiled tubing downhole cable bypass nipple, which can simultaneously meet the functions of fixing, sealing and bypassing downhole cables, and can ensure the flow path, and has a simple structure and low cost.

[0007] The object of the present invention is achieved in this way. A steel continuous pipe downhole cable passing bypass short section comprises an outer tube; the outer tube has a central channel located at the upper part thereof and an eccentric channel and an oblique channel located at the lower part thereof, and the eccentric channel and the oblique channel are both connected to the central channel; the central channel is connected to the upper end of the outer tube upward, the axis of the eccentric channel deviates from the center line of the central channel, and the lower part of the eccentric channel is connected to the center of the lower end of the outer tube after being deflected; a notch is provided in the lower outer wall of the outer tube, the lower end of the oblique channel is connected to the notch, and the oblique channel can be sealed and passed through by the cable; an upper rosette and a lower rosette are provided in the central channel with an upper and lower interval, and the upper rosette and the lower rosette both have a central hole for the cable to pass through and a plurality of oil holes arranged around the central hole; a slip connector is connected between the upper rosette and the lower rosette, the inner diameter of the slip connector is arranged opposite to the central hole and can allow the cable to pass through, and the slip connector has a slip that can be radially contracted and has teeth on the inner wall, the slip is arranged in a contracted state and the teeth can bite the cable.

[0008] In a preferred embodiment of the present invention, the cava connector also includes an upper pipe and a lower pipe, and the upper pipe and the lower pipe are axially limited between the upper rosette and the lower rosette; the upper pipe has an inner conical surface with a diameter gradually expanding downward, the outer wall of the cava is an outer conical surface matching the inner conical surface, and the cava is inserted into the upper pipe in a contracted state; the outer wall of the upper end of the lower pipe is threadedly connected to the inner wall of the lower end of the upper pipe, and the upper end of the lower pipe can be against the cava.

[0009] In a preferred embodiment of the present invention, the cava is a conical tube body with a longitudinal cut, the teeth are formed on the inner wall of the conical tube body, and the outer conical surface is formed on the outer wall of the conical tube body; a plurality of slits are formed on the tube wall of the conical tube body, and the slits extend to one of the ends of the conical tube body.

[0010] In a preferred embodiment of the present invention, the plurality of slits include a plurality of first slits and a plurality of second slits arranged alternately, the first slits extend upward to the upper end of the conical tube body, and the second slits extend downward to the lower end of the conical tube body.

[0011] In a preferred embodiment of the present invention, the upper end of the lower connecting pipe is circumferentially fixedly connected to the lower end of the slip.

[0012] In a preferred embodiment of the present invention, the upper connecting pipe includes an outer sleeve and an inner tapered sleeve, the interior of the outer sleeve has a stepped mounting hole with a diameter expanding downward, the inner tapered sleeve is inserted into the stepped mounting hole and can rest against the top hole shoulder of the stepped mounting hole, and the inner tapered surface is formed on the inner wall of the inner tapered sleeve.

[0013] In a preferred embodiment of the present invention, an upper stepped hole with an enlarged diameter is formed downwardly at the lower portion of the center hole of the upper rosette, and an upper convex ring is formed at the upper end of the upper pipe, which can be inserted into the upper stepped hole and can rest against the top hole shoulder of the upper stepped hole; a lower stepped hole with an enlarged diameter is formed upwardly at the upper portion of the center hole of the lower rosette, and a lower convex ring is formed at the lower end of the lower pipe, which can be inserted into the lower stepped hole and can rest against the bottom hole shoulder of the lower stepped hole.

[0014] In a preferred embodiment of the present invention, an upper limit step and a lower limit step are formed on the inner wall of the outer tube, and the upper rosette and the lower rosette can respectively abut against the upper limit step and the lower limit step.

[0015] In a preferred embodiment of the present invention, the outer tube includes an upper tube body and a lower tube body which are sealed and connected up and down, a part of the central channel is formed in the upper tube body, another part of the central channel is formed in the upper part of the lower tube body, and the eccentric channel and the oblique channel are both formed in the lower part of the lower tube body; a notch is formed on the outer wall of the lower tube body, and the upper wreath and the lower wreath are respectively arranged in the upper tube body and the lower tube body.

[0016] In a preferred embodiment of the present invention, a cross-step hole with an increasing aperture is formed downwardly at the lower portion of the oblique channel, and an upper pressure ring, a rubber tube, a lower pressure ring and a hollow bolt are sequentially embedded in the cross-step hole from top to bottom. The hollow bolt is threadedly connected to the hole wall of the cross-step hole and the hollow bolt can rest against the lower pressure ring.

[0017] In a preferred embodiment of the present invention, the angle between the axis of the oblique channel and the axis of the outer tube is 5-10°.

[0018] In a preferred embodiment of the present invention, the cross-section of the notch in the plane where the axis of the eccentric channel and the axis of the oblique channel are located is a trapezoid, and the lower base of the trapezoid corresponds to the opening end of the notch, the two waists of the trapezoid are both hypotenuses, and one of the hypotenuses is connected to the lower end of the oblique channel and is perpendicular to the axis of the oblique channel.

[0019] In a preferred embodiment of the present invention, the angle between the hypotenuse away from the oblique channel in the trapezoid and the axis of the outer tube is less than or equal to 30°.

[0020] As described above, the steel continuous pipe downhole cable in the present invention passes through the bypass short section, and the radial contraction of the slip in the slip connector enables the teeth to bite the cable tightly, so as to achieve the suspension and fixation of the cable, and the suspension is stable; the central hole of the upper rosette and the lower rosette cooperate with the surrounding multiple oil holes, so that the flow path in the tool is guaranteed when the cable is fixed inside, and the need for milling process of the outer tube itself is avoided, thereby reducing the production cost; the bypass crossing of the cable is achieved through the cooperation of the eccentric channel and the oblique channel, and the connection between the lower end of the entire bypass short section and other tool strings is not affected; at the same time, the oblique channel has a sealing function, which avoids the oil sleeve ring air liquid from entering the outer tube during use. The entire bypass short section simultaneously meets the functions of fixing, sealing and bypassing the downhole cable, and can ensure the flow path, and has a simple structure, low manufacturing and installation costs, and can pass the cable into the interior of the continuous pipe, and connect it to the submersible electric pump cable at the bottom of the well by the cable passing through the interior of the continuous pipe, which can significantly reduce the damage to the cable during the operation process and improve the safety and efficiency of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0022] Figure 1 : A cross-sectional view of a steel continuous pipe downhole cable passing through a bypass short section provided by the present invention.

[0023] Figure 2 : A cross-sectional view of the outer tube provided by the present invention.

[0024] Figure 3 : A cross-sectional view of an upper wreath provided by the present invention.

[0025] Figure 4 :for Figure 3 Bottom view of the upper middle wreath.

[0026] Figure 5 : is the cross-sectional view of the lower rosette provided by the present invention.

[0027] Figure 6 :for Figure 1 A partial enlarged view of the middle slip connector part.

[0028] Figure 7 : A three-dimensional diagram of the slip provided by the present invention.

[0029] Figure 8 : A cross-sectional view of the slip provided by the present invention.

[0030] Fig. 9 :for Figure 8 A top view of the middle slip.

[0031] Fig.10 :The three-dimensional structure of the lower connecting pipe provided by the present invention Figure 1 .

[0032] Fig.11 :The three-dimensional structure of the lower connecting pipe provided by the present invention Figure 2 .

[0033] Fig.12 : A cross-sectional view of the lower connecting pipe provided by the present invention.

[0034] Fig.13 :for Fig.12 Top view of the middle and lower pipe.

[0035] Description of Figure Numbers:

[0036] 1. Outer tube; 11. Center channel; 12. Eccentric channel; 121. Axial channel; 122. Inclined channel; 13. Oblique channel; 131. Crossing stepped hole; 14. Notch; 15. Upper tube body; 151. Upper limit step; 16. Lower tube body; 161. Lower limit step; 17. Sealing ring;

[0037] 21. Upper rosette; 211. Upper stepped hole; 22. Lower rosette; 221. Lower stepped hole; 23. Center hole; 24. Oil hole;

[0038] 3. Slip connector;

[0039] 31. upper pipe; 311. outer sheath; 3111. stepped mounting hole; 3112. upper convex ring; 312. inner conical sleeve; 3121. inner conical surface;

[0040] 32, slip; 321, tooth; 322, outer conical surface; 323, longitudinal incision; 324, slit; 3241, first slit; 3242, second slit; 325, groove;

[0041] 33. lower connecting pipe; 331. protrusion; 332. lower protruding ring;

[0042] 4. Upper pressure ring;

[0043] 5. Rubber tube;

[0044] 6. Lower pressure ring;

[0045] 7. Hollow bolt. DETAILED DESCRIPTION

[0046] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0047] like Figures 1 to 13 As shown, this embodiment provides a steel continuous pipe downhole cable passing bypass nipple, including an outer pipe 1. The outer pipe 1 has a central channel 11 located at the upper part thereof, and an eccentric channel 12 and an oblique channel 13 located at the lower part thereof, and the eccentric channel 12 and the oblique channel 13 are both connected to the central channel 11. The central channel 11 is connected to the upper end of the outer pipe 1 upward, the axis of the eccentric channel 12 deviates from the center line of the central channel 11, and the lower part of the eccentric channel 12 is connected to the center of the lower end of the outer pipe 1 after being deflected. A notch 14 is provided in the lower outer side wall of the outer pipe 1, and the lower end of the oblique channel 13 is connected to the notch 14, and the oblique channel 13 can allow the cable to pass through in a sealed manner. An upper rosette 21 and a lower rosette 22 are provided in the central channel 11, which are spaced up and down, and the upper rosette 21 and the lower rosette 22 both have a central hole 23 for the cable to pass through, and a plurality of oil holes 24 arranged around the central hole 23. A slip connector 3 is connected between the upper rosette 21 and the lower rosette 22. The inner diameter of the slip connector 3 is arranged opposite to the center hole 23 and can allow the cable to pass through. The slip connector 3 has a slip 32 that can radially shrink and has teeth 321 on the inner wall. The slip 32 is arranged in a contracted state and the teeth 321 can bite the cable.

[0048] It can be understood that the center line of the central channel 11 is the center line of the outer tube 1, and the eccentric channel 12 and the oblique channel 13 are arranged side by side. There is a certain angle between the axis of the oblique channel 13 and the center line of the central channel 11. The above-mentioned notch 14 can be relatively long, and the length of the oblique channel 13 is relatively short, which is convenient for processing and installation. The specific size depends on the needs. The oblique channel 13 is used to pass the cable, and the eccentric channel 12 is used to pass the oil. The eccentric channel 12 is deflected to the center of the lower end of the outer tube 1 in the middle, which is convenient for connection with other tool strings when used. The aperture of the center hole 23 of each rosette matches the armor tube of the armored cable and should be slightly larger than the outer diameter of the armor tube. When in use, the cable passes through the center hole 23, and the oil mainly passes through the surrounding oil holes 24. The number and shape of the oil holes 24 can be selected according to actual conditions. For example, in this embodiment, Figure 4 As shown, the oil hole 24 is a waist-shaped hole, and the upper rosette 21 and the lower rosette 22 each have four oil holes 24. The teeth 321 on the slip 32 can be serrated teeth or other shapes, as long as they can firmly bite the cable after the slip 32 is radially contracted. The tip distance of the teeth 321 on the opposite sides of the slip 32 matches the size of the armor tube of the armored cable. When in use, the tooth tips of the teeth 321 of the slip 32 bite the armor tube of the armored cable to achieve the suspension function. During installation, after the cable passes through the slip connector 3, the slip 32 is adjusted to a contracted state, and the slip 32 can be used to fix the cable.

[0049] Therefore, the steel continuous pipe downhole cable in this embodiment passes through the bypass short section, and the radial contraction of the slip 32 in the slip connector 3 enables the teeth 321 to bite the cable tightly, so that the cable is suspended and fixed, and the suspension is stable; through the cooperation of the central hole 23 of the upper rosette 21 and the lower rosette 22 and the surrounding multiple oil holes 24, the flow path in the tool is guaranteed when the cable is fixed inside, and the need for milling process on the outer tube 1 itself is avoided, thereby reducing the production cost; through the cooperation of the eccentric channel 12 and the oblique channel 13, the bypass crossing of the cable is realized, and the connection between the lower end of the entire bypass short section and other tool strings is not affected; at the same time, the oblique channel 13 has a sealing function, which prevents the oil sleeve ring air liquid from entering the outer tube 1 during use. The entire bypass nipple simultaneously satisfies the functions of fixing, sealing and bypassing the downhole cable and can ensure the flow path. It has a simple structure and low manufacturing and installation costs. The cable can be passed through the coiled tubing and connected to the submersible pump cable at the bottom of the well by passing the cable through the coiled tubing. This can significantly reduce the damage to the cable during operation and improve the safety and efficiency of the operation.

[0050] It should be noted that the upper and lower positions mentioned in the article refer to the bypass sub Figure 1 The axial direction of the outer tube 1 shown in the figure is in the up-down orientation when placed vertically. The "top", "bottom", "upper", "lower" and similar expressions mentioned in this article are only for illustrative purposes and do not represent the only implementation method. In actual use, the bypass short section can be placed vertically or in other directions, depending on the specific needs. Generally, the bypass short section is placed vertically according to the axial direction of the outer tube 1 in actual applications.

[0051] In a specific implementation, in order to facilitate installation, the slips 32 are adjusted to a retracted state, such as Figure 1 , Figure 6 and Figure 7 As shown, the slip connector 3 also includes an upper pipe 31 and a lower pipe 33, and the upper pipe 31 and the lower pipe 33 are axially limited between the upper rosette 21 and the lower rosette 22. The upper pipe 31 has an inner conical surface 3121 with a diameter gradually expanding downward, and the outer wall of the slip 32 is an outer conical surface 322 that matches the inner conical surface 3121. The slip 32 is arranged in a contracted state in the upper pipe 31. The upper end outer wall of the lower pipe 33 is threadedly connected to the lower end inner wall of the upper pipe 31, and the upper end of the lower pipe 33 can be against the slip 32.

[0052] In order to make the slips 32 radially contract smoothly, Figures 7 to 9As shown, the slip 32 is a conical tube body with a longitudinal cutout 323, teeth 321 are formed on the inner wall of the conical tube body, and an outer conical surface 322 is formed on the outer wall of the conical tube body. A plurality of slits 324 are formed on the tube wall of the conical tube body, and the slits 324 extend to one end of the conical tube body. Due to the presence of the longitudinal cutout 323 and the plurality of slits 324, the slip 32 forms a multi-petal structure with gaps between each petal, so that the conical tube body has a certain elasticity, and the overall radial contraction or expansion of the slip 32 can be achieved by changing the width of the longitudinal cutout 323 and the gap width of the slits 324.

[0053] More specifically, the taper of the outer conical surface 322 of the slip 32 and the inner conical surface 3121 of the upper connecting pipe 31 should be the same, and the two can fit together during use, and the axial length of the inner conical surface 3121 should be slightly longer than the length of the slip 32. At the same time, when the outer conical surface 322 of the slip 32 and the inner conical surface 3121 of the upper connecting pipe 31 are naturally fitted (that is, the slip 32 is in a state of natural expansion and no radial contraction), there should be a certain distance (referred to as the first distance) between the upper end of the slip 32 and the step at the upper end of the inner conical surface 3121 in the upper connecting pipe 31; when the lower connecting pipe 33 just fits with the slip 32 during the process of being screwed into the upper connecting pipe 31, there should also be a certain distance between the thread step of the lower connecting pipe 33 (specifically, the lowest end of its thread step) and the bottom end of the upper connecting pipe 31. (recorded as the second distance), and the second distance should be greater than the first distance; when the lower connecting pipe 33 continues to be screwed in, the slip 32 will move upward. Since the diameter of the inner conical surface 3121 gradually decreases upward, each petal of the slip 32 will be compressed, so that the slip 32 is in a contracted state, and the distance between the tooth tips of the opposite teeth 321 in the slip 32 is reduced. When the distance is reduced to be smaller than the outer diameter of the armor tube of the armored cable, the tooth tips of the teeth 321 of the slip 32 will bite into and tighten the armor tube of the cable, and the armored cable cannot move, thereby achieving the fixation of the cable.

[0054] Therefore, the entire slip connector 3 adopts the matching connection of the upper pipe 31, slip 32 and lower pipe 33. The slip 32 can be pushed to move by continuously tightening the lower pipe 33. The tightening of the lower pipe 33 and the inner conical surface 3121 of the upper pipe 31 can drive the slip 32 to shrink, thereby biting the armor tube of the cable. The biting effect of the teeth 321 on the slip 32 can ensure that the cable is fixed and suspended reliably regardless of whether it is subjected to upward or downward forces. Moreover, when the cable is subjected to an upward pulling force, the slip 32 will be pulled to move upward along the inner conical surface 3121, which will make the bite tighter and tighter. On the one hand, the cable is fixed underground, and on the other hand, the biting of the slip 32 can make the cable withstand greater pulling force, ensuring the stable suspension of the cable underground.

[0055] In practical applications, in order to further improve the cable suspension effect, such as Figure 7As shown, the plurality of slits 324 include a plurality of first slits 3241 and a plurality of second slits 3242 arranged in a staggered manner, the first slits 3241 extending upward to the upper end of the conical tube body, and the second slits 3242 extending downward to the lower end of the conical tube body. In the process of the lower pipe 33 rotating and driving the slip 32 to contract, the staggered first slits 3241 and the second slits 3242 can make the contraction deformation of the slip 32 more uniform, and the teeth 321 in the slip 32 can bite the cable more uniformly, avoiding the situation where some teeth 321 bite tightly while others bite loosely, so that the slip 32 can fix the cable more firmly.

[0056] Further preferably, the upper end of the lower connecting pipe 33 is circumferentially fixedly connected to the lower end of the slip 32 .

[0057] The circumferential fixation of the lower pipe 33 and the slip 32 can be achieved as follows: Figure 7 and Fig.10 As shown, a plurality of grooves 325 are provided at intervals in the circumferential direction on the lower end surface of the slip 32, and a plurality of protrusions 331 are provided at intervals in the circumferential direction on the upper end of the lower pipe 33. The shape of the protrusions 331 matches the shape of the grooves 325, and the protrusions 331 can be embedded in the grooves 325. For example, in this embodiment, four square grooves are symmetrically provided at the lower end of the slip 32, and four square protrusions are symmetrically provided at the upper end of the lower pipe 33. When the protrusions 331 are clamped in the grooves 325, the lower pipe 33 and the slip 32 are fixed in the circumferential direction, and the slip 32 can rotate under the screwing of the lower pipe 33; if the cable has a tendency to rotate during subsequent construction and production operations, the torque generated by the slip 32 can be borne by the lower pipe 33 and its meshing threads through the cooperation of the grooves 325 and the protrusions 331, which can effectively avoid the distortion and damage of the cable.

[0058] Furthermore, in order to improve the machining accuracy, Figure 6 As shown, the upper pipe 31 includes an outer sleeve 311 and an inner tapered sleeve 312. The interior of the outer sleeve 311 has a stepped mounting hole 3111 with a diameter that expands downward. The inner tapered sleeve 312 is inserted into the stepped mounting hole 3111 and can rest against the top hole shoulder of the stepped mounting hole 3111. An inner tapered surface 3121 is formed on the inner wall of the inner tapered sleeve 312.

[0059] The inner diameter of the upper end of the outer sheath 311 and the inner diameter of the lower pipe 33 should match the size of the armored tube of the armored cable. The first distance specifically refers to the distance between the upper end of the slip 32 and the top shoulder of the stepped mounting hole 3111 when the outer conical surface 322 of the slip 32 naturally fits with the inner conical surface 3121 of the upper pipe 31. The upper pipe 31 is formed of two parts, the outer sheath 311 and the inner conical sleeve 312, which not only facilitates the processing of the inner conical surface 3121, but also improves the accuracy of the inner conical surface 3121. During the installation process, the inner conical sleeve 312 may or may not rotate relative to the outer sheath 311, but it does not affect the fixing effect of the slip 32 on the cable.

[0060] Furthermore, in order to facilitate the axial fixation of the upper pipe 31 and the lower pipe 33, as shown in FIG. Figure 1 , Figure 3 and Figure 5 As shown, an upper stepped hole 211 with an enlarged diameter is formed downwardly at the lower part of the center hole 23 of the upper rosette 21, and an upper convex ring 3112 is formed at the upper end of the upper pipe 31. The upper convex ring 3112 can be inserted into the upper stepped hole 211 and can abut against the top hole shoulder of the upper stepped hole 211. A lower stepped hole 221 with an enlarged diameter is formed upwardly at the upper part of the center hole 23 of the lower rosette 22, and a lower convex ring 332 is formed at the lower end of the lower pipe 33. The lower convex ring 332 can be inserted into the lower stepped hole 221 and can abut against the bottom hole shoulder of the lower stepped hole 221. It can be understood that the upper convex ring 3112 is specifically formed at the upper end of the outer sheath 311, the upper stepped hole 211 extends downward to the lower end surface of the upper rosette 21, and the lower stepped hole 221 extends upward to the upper end surface of the lower rosette 22.

[0061] In order to facilitate the fixing of the upper wreath 21 and the lower wreath 22, as shown in FIG. Figure 1 and Figure 2 As shown, an upper limit step 151 and a lower limit step 161 are formed on the inner wall of the outer tube 1, and the upper garland 21 and the lower garland 22 can respectively abut against the upper limit step 151 and the lower limit step 161, so as to utilize the upper limit step 151 and the lower limit step 161 to limit the upper garland 21 and the lower garland 22 respectively.

[0062] In order to facilitate processing and installation, Figure 1 and Figure 2 As shown, the outer tube 1 includes an upper tube body 15 and a lower tube body 16 which are sealed and connected to each other, a part of the central channel 11 is formed in the upper tube body 15, another part of the central channel 11 is formed in the upper part of the lower tube body 16, and the eccentric channel 12 and the oblique channel 13 are both formed in the lower part of the lower tube body 16. A notch 14 is formed on the outer wall of the lower tube body 16, and an upper rosette 21 and a lower rosette 22 are respectively arranged in the upper tube body 15 and the lower tube body 16.

[0063] Generally, the lower end outer wall of the upper tube body 15 is threadedly connected to the upper end inner wall of the lower tube body 16, and a groove is provided at the connection to add a sealing ring 17 to achieve the purpose of sealing, so as to prevent leakage between the inner cavity of the outer tube 1 and the external liquid; the upper tube body 15 is a through-type structure, and its upper end is an inner thread of the oil pipe, which can be connected to the downhole tool string; the lower end of the lower tube body 16 is an outer thread of the oil pipe, which can be connected to the tool string at the lower end. The upper limit step 151 and the lower limit step 161 are formed in the upper tube body 15 and the lower tube body 16, respectively. The dimensions of the upper tube body 15, the lower tube body 16 and the slip connector 3 and other components should be reasonably designed to ensure the suspending effect of the slip 32 on the cable; for example, during installation, when the lower wreath 22 cooperates with the lower connecting pipe 33, the spacing between the internal thread step at the upper end of the lower tube body 16 and the external thread step at the lower end of the upper tube body 15 should be larger than the gap between the thread step of the lower connecting pipe 33 and the bottom end of the upper connecting pipe 31, so as to ensure that the thread of the lower connecting pipe 33 can be fully tightened until the thread sections of the upper connecting pipe 31 and the lower connecting pipe 33 coincide, so that the slip 32 can fully engage with the cable.

[0064] In this way, the entire slip connector 3 cooperates with the top hole shoulder of the upper stepped hole 211 and the bottom hole shoulder of the lower stepped hole 221 through the upper convex ring 3112 of the upper pipe 31 and the lower convex ring 332 of the lower pipe 33, respectively, to achieve the overall fixation and limitation of the slip connector 3, prevent the cable from shaking due to the vibration of the electric pump during the oil production operation, and reduce the risk of use. The upper rosette 21, the lower rosette 22 and the slip connector 3 are limited by the limiting space formed by the upper limit step 151 and the lower limit step 161 inside the outer tube 1, and the threaded connection between the upper tube body 15 and the lower tube body 16 achieves the effect of completely fixing the parts in the cavity, and meets the requirements of cable fixing, diameter and limitation when the cable is passed inside.

[0065] Furthermore, in order to ensure the sealing of the cable when it passes through the oblique channel 13, as Figure 1 and Figure 2 As shown, a through stepped hole 131 with an increased aperture is formed downwardly at the lower portion of the oblique channel 13, and an upper pressure ring 4, a rubber tube 5, a lower pressure ring 6 and a hollow bolt 7 are sequentially embedded in the through stepped hole 131 from top to bottom. The hollow bolt 7 is threadedly connected to the hole wall of the through stepped hole 131 and the hollow bolt 7 can rest against the lower pressure ring 6.

[0066] The through-step hole 131 extends downward to the bottom end of the oblique channel 13, the top shoulder of the through-step hole 131 can limit the upper pressure ring 4, and there is a section of internal thread at the end of the through-step hole 131. The rubber tube 5 is sandwiched between the two pressure rings, and the outermost hollow bolt 7 has an inner through hole running through both ends thereof. The inner diameter of the rubber tube 5, the two pressure rings and the hollow bolt 7 should match the outer diameter of the armored tube of the armored cable. The front end external thread of the hollow bolt 7 can be connected with the end internal thread of the through-step hole 131, and the bolt head of the hollow bolt 7 is exposed to the outside. When the hollow bolt 7 is rotated to just contact the lower pressure ring 6, the thread step of the hollow bolt 7 (specifically, the lowest end of its thread step, i.e., the upper end position of the bolt head) should be at a certain distance from the through-step hole (i.e., the lower end of the oblique channel 13), so that the hollow bolt 7 can continue to be screwed in to compress the rubber tube 5 to expand radially, thereby sealing the annulus between the armored tube and the through-step hole 131.

[0067] Since armored cables used in oil fields are often highly corrosion-resistant, there is no need to consider the sealing of the hanging parts, and only the prevention of annular space liquid from entering the tool is required. Through the cooperation of the pressure rings, rubber tube 5 and hollow bolt 7, when the hollow bolt 7 is continuously screwed inward, the rubber tube 5 is radially deformed under the extrusion of the lower pressure ring 6, which plays a role in sealing the annular space between the cable armor tube and the through-step hole 131, effectively ensuring the sealing of the cable outlet end and preventing the oil casing annular space liquid from entering the tool. The upper part of the through-step hole 131 (i.e., the part without thread processing) and the upper pressure ring 4, lower pressure ring 6 and rubber tube 5 that cooperate therewith are generally not in the shape of a perfect circle, so as to prevent the sealing assembly composed of the pressure ring and rubber tube 5 from rotating during use, affecting the sealing effect.

[0068] Furthermore, the pipeline of the lower tube body 16 is designed eccentrically, and the pipeline is tilted in the middle, so that the pipeline leads to the center of the lower part of the lower tube body 16 and communicates with the lower tool. In order to facilitate processing, the above-mentioned eccentric channel 12 includes an axial channel 121 and an inclined channel 122 that are connected to each other, the axis of the axial channel 121 is parallel to the center line of the central channel 11, the axis of the inclined channel 122 is set at a certain angle to the axis of the axial channel 121, and the lower end of the inclined channel 122 is connected to the lower end center of the lower tube body 16.

[0069] The oblique channel 13 of the lower tube 16 is designed obliquely. The cable is coated with a few millimeters thick armor layer on the outside, which is difficult to bend. If the bending angle is too large, there is a risk of cable damage. The obliquely designed lower tube 16 allows the cable to pass smoothly through the lower tube 16 without other internal docking links. Due to the bending of the armored cable product itself and considering the distance of bypass crossing, the angle between the axis of the oblique channel 13 and the axis of the outer tube 1 is preferably 5 to 10 degrees to facilitate the natural crossing of the cable.

[0070] Preferably, the cross section of the notch 14 in the plane where the axis of the eccentric channel 12 and the axis of the oblique channel 13 are located is a trapezoid, and the lower bottom of the trapezoid corresponds to the open end of the notch 14, and the two waists of the trapezoid are both hypotenuses, and one of the hypotenuses (i.e., the upper hypotenuse) is connected to the lower end of the oblique channel 13 and is perpendicular to the axis of the oblique channel 13. The two hypotenuses of the trapezoid correspond to the upper and lower oblique surfaces of the notch 14, and the two oblique surfaces of the notch 14 can facilitate the cable to smoothly enter the oil casing annulus and connect with the lead-in cable of the submersible electric pump. Further, the angle between the upper hypotenuse of the trapezoid and the horizontal plane and the angle between the lower hypotenuse of the trapezoid and the axis of the outer tube 1 should be as small as possible, so that the cable can smoothly enter the annulus and avoid large bending and damage to the cable. In this embodiment, because the upper hypotenuse of the trapezoid is perpendicular to the axis of the oblique channel 13, the angle between the upper hypotenuse of the trapezoid and the horizontal plane is equal to the angle between the axis of the oblique channel 13 and the center line of the central channel 11, and both are preferably 5 to 10°. The angle between the hypotenuse (ie, the lower hypotenuse) in the trapezoid away from the oblique channel 13 and the axis of the outer tube 1 is preferably less than or equal to 30°.

[0071] Furthermore, the installation method of the above-mentioned cable crossing bypass short section is as follows:

[0072] During installation, the cable is passed through the continuous pipe along the inner channel of the downhole tool string until the cable in this embodiment passes through the bypass nipple. Then the cable is passed through the upper pipe body 15 and the upper rosette 21, and the upper end of the upper pipe body 15 is connected to the downhole tool string after passing through a suitable distance. The upper rosette 21 with the cable is installed into the inner cavity of the upper pipe body 15 and abutted against the upper limit step 151, so that the upper step hole 211 of the upper rosette 21 faces the outer end (i.e., downward), and then the cable is passed through the upper pipe 31, and the upper convex ring 3112 of the upper pipe 31 is inserted into the upper step hole 211 of the upper rosette 21 and abutted against the top hole shoulder of the upper step hole 211.

[0073] After slip 32 is inserted into the cable, slip 32 is pushed into the upper pipe 31, and then the lower pipe 33 is inserted, and the outer thread of the lower pipe 33 is connected with the inner thread of the upper pipe 31, and then the lower pipe 33 is completely tightened, so that the cable is tightly bitten by slip 32 and will not move. Since the matching surface of slip 32 and upper pipe 31 is a conical surface, when the cable and the tool string are to move relative to each other, slip 32 will be pressed tighter and tighter by the conical surface, and the cable will be bitten tighter, ensuring the suspension and fixation of the cable underground. After tightening the lower pipe 33, the lower rosette 22 is placed on the lower limit step 161 of the lower tube body 16, and the lower step hole 221 of the lower rosette 22 faces the lower pipe 33.

[0074] The cable is passed through the lower tube body 16 equipped with the lower rosette 22 and passed through the oblique channel 13 of the lower tube body 16. After the sealing ring 17 is put on the upper tube body 15, the lower tube body 16 is connected with the upper tube body 15, and the thread is tightened until the bottom hole shoulder of the lower stepped hole 221 of the lower rosette 22 and the lower pipe 33 are matched. Next, the cable is passed through the upper pressure pad, the rubber tube 5, the lower pressure ring 6 and the hollow bolt 7 in sequence, and then the four parts are put into the oblique channel 13 in sequence, and the hollow bolt 7 is screwed in. During the screwing process of the hollow bolt 7, the lower pressure ring 6 is pushed, and the rubber tube 5 is pressed to deform by pushing the lower pressure ring 6, thereby sealing the annulus between the cable and the oblique channel 13.

[0075] The slip 32, the upper pipe 31 and the lower pipe 33 cooperate with each other to achieve the fixation and suspension of the cable in this embodiment. The sealing ring 17 and the rubber tube 5 achieve the sealing effect of this embodiment. After the cable passes through the oblique channel 13, it will be connected from the casing annulus to the lead-in cable of the submersible electric pump. The cable crossing bypass short section of this embodiment is installed.

[0076] In summary, the steel continuous tubing downhole cable crossing bypass short section in this embodiment is suitable for the operation of oil and gas well continuous tubing electric submersible pump oil production or logging instruments. Through the cooperation of the upper pipe 31, the slip 32 and the lower pipe 33 in the slip connector 3, the cable can be firmly suspended, and the flow path of the tool can be guaranteed by the cooperation of the center hole 23 and the oil hole 24 of each rosette. The cooperation of the eccentric channel 12 and the oblique channel 13 is convenient for the lower end of the tool to be connected with other tool strings, and the bypass crossing of the cable is realized, and the sealing of the cable outlet end is guaranteed. The entire cable crossing bypass short section is a downhole crossing bypass connector with a simple structure, reliable sealing, and can work under pressure. It can realize the function of the cable passing through the pipe and connecting with the lead cable of the submersible electric pump after passing through the bypass short section, which can greatly reduce the damage of the cable during the operation process, and there is no need to use a cable protector, which reduces the cost of continuous tubing logging, oil production or operation.

[0077] The above are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A steel coiled tubing downhole cable passing through a bypass nipple, characterized in that: Including outer tube; The outer tube has a central channel located at the upper part thereof, and an eccentric channel and an oblique channel located at the lower part thereof, the eccentric channel and the oblique channel are both connected to the central channel; the central channel is connected to the upper end of the outer tube upward, the axis of the eccentric channel deviates from the center line of the central channel, and the lower part of the eccentric channel is connected to the center of the lower end of the outer tube after being deflected; a notch is opened on the outer side wall of the lower part of the outer tube, the lower end of the oblique channel is connected to the notch, and the oblique channel can allow the cable to pass through in a sealed manner; An upper rosette and a lower rosette are provided in the central channel at intervals, and both the upper rosette and the lower rosette have a central hole through which the cable can pass, and a plurality of oil holes arranged around the central hole; a slip connector is connected between the upper rosette and the lower rosette, and the inner diameter of the slip connector is arranged opposite to the central hole and through which the cable can pass, and the slip connector has a radially contractible slip with teeth on the inner wall, and the slip is arranged in a contracted state and the teeth can bite the cable; The cava connector also includes an upper connecting pipe and a lower connecting pipe, and the upper connecting pipe and the lower connecting pipe are axially limited between the upper rosette and the lower rosette; the upper connecting pipe has an inner conical surface with a diameter gradually expanding downward, and the outer wall of the cava is an outer conical surface matching the inner conical surface, and the cava is inserted into the upper connecting pipe in a contracted state; the outer wall of the upper end of the lower connecting pipe is threadedly connected to the inner wall of the lower end of the upper connecting pipe, and the upper end of the lower connecting pipe can be abutted against the cava.

2. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 1, characterized in that: The slip is a conical tube body with a longitudinal cut, the teeth are formed on the inner wall of the conical tube body, and the outer conical surface is formed on the outer wall of the conical tube body; a plurality of slits are formed on the tube wall of the conical tube body, and the slits extend to one of the ends of the conical tube body.

3. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 2, characterized in that: The plurality of slits include a plurality of first slits and a plurality of second slits that are staggered, the first slits extend upward to the upper end of the conical tube body, and the second slits extend downward to the lower end of the conical tube body.

4. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 1, characterized in that: The upper end of the lower connecting pipe is circumferentially fixedly connected to the lower end of the slip.

5. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 1, characterized in that: The upper pipe includes an outer sleeve and an inner tapered sleeve. The inner part of the outer sleeve has a stepped mounting hole with a diameter that expands downward. The inner tapered sleeve is inserted into the stepped mounting hole and can rest against the top hole shoulder of the stepped mounting hole. The inner tapered surface is formed on the inner wall of the inner tapered sleeve.

6. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 1, characterized in that: An upper stepped hole with an enlarged diameter is formed downwardly at the lower part of the center hole of the upper rosette, and an upper convex ring is formed at the upper end of the upper pipe, which can be inserted into the upper stepped hole and can rest on the top hole shoulder of the upper stepped hole; a lower stepped hole with an enlarged diameter is formed upwardly at the upper part of the center hole of the lower rosette, and a lower convex ring is formed at the lower end of the lower pipe, which can be inserted into the lower stepped hole and can rest on the bottom hole shoulder of the lower stepped hole.

7. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 1, characterized in that: An upper limit step and a lower limit step are formed on the inner wall of the outer tube, and the upper rosette and the lower rosette can respectively abut against the upper limit step and the lower limit step.

8. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 1, characterized in that: The outer tube includes an upper tube body and a lower tube body which are sealed and connected up and down, a part of the central channel is formed in the upper tube body, another part of the central channel is formed in the upper part of the lower tube body, the eccentric channel and the oblique channel are both formed in the lower part of the lower tube body; the notch is formed on the outer wall of the lower tube body, and the upper rosette and the lower rosette are respectively arranged in the upper tube body and the lower tube body.

9. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 1, characterized in that: A through step hole with an increasing aperture is formed downwardly at the lower part of the oblique channel, and an upper pressure ring, a rubber tube, a lower pressure ring and a hollow bolt are sequentially embedded in the through step hole from top to bottom. The hollow bolt is threadedly connected to the hole wall of the through step hole and the hollow bolt can rest against the lower pressure ring.

10. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 1, characterized in that: The angle between the axis of the oblique channel and the axis of the outer tube is 5-10°.

11. The steel coiled tubing downhole cable passing bypass nipple as claimed in claim 1, characterized in that: The cross-section of the notch in the plane where the axis of the eccentric channel and the axis of the oblique channel are located is a trapezoid, and the lower base of the trapezoid corresponds to the open end of the notch, the two waists of the trapezoid are both hypotenuses, and one of the hypotenuses is connected to the lower end of the oblique channel and is perpendicular to the axis of the oblique channel.

12. The steel coiled tubing downhole cable passing bypass nipple according to claim 11, characterized in that: The angle between the hypotenuse in the trapezoid away from the oblique channel and the axis of the outer tube is less than or equal to 30°.

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