A rolling propelling device for perforated pipe string of an up-dip angle horizontal well

Abstract

The application discloses a kind of up-dip angle horizontal well perforating pipe string rolling propulsion device, it is related to oilfield perforating completion perforating device technical field.The perforating gun pipe and rolling propulsion joint are included, and rolling propulsion joint is detachably connected between two adjacent perforating gun pipes;Rolling propulsion joint includes joint body, rotating body, rolling body, steel ball and electrically-conductive sealing communication component;Rotating body is connected on the side wall of joint body;Rolling body is connected with rotating body by steel ball and rolls;Rolling body supports, eccentric centralizing and is installed with electrically-conductive sealing communication component in joint body.The connection between adjacent perforating gun pipes is stable, can reduce the frictional resistance in the cable pumping conveying process of up-dip angle horizontal well perforating pipe string, and gravity can be prevented from retrogressing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield perforation completion perforating device, and particularly relates to a rolling propelling device for an up-dip angle horizontal well perforating pipe string. BACKGROUND

[0002] Oil and gas field perforation completion refers to the method of perforation completion that after a casing is run into a producing layer and the producing layer is cemented, the casing and cement are perforated by a perforating bullet, and a part of the producing layer rock is perforated to form a channel for oil and gas flow, and the producing layer and the wellbore are connected. Perforation is an operation activity of entering a predetermined layer in a wellbore by using special energy concentrator equipment to perform explosion opening to allow the fluid in the downhole formation to enter the perforation. Thin oil layers and fractured reservoirs, special structure wells such as high angle deviated wells and horizontal wells, especially shale oil, coalbed methane, and ultra-low permeability tight oil and gas, need precise directional perforation and hydraulic fracturing to obtain productivity. At present, since the shale oil, coalbed methane, and ultra-low permeability tight oil and gas reservoirs are mostly horizontal layers, the reservoirs are dispersed and have a large distribution range. In order to save costs, the perforating gun string for all reservoirs of a well is once lowered into the downhole, and then perforation is performed. The perforating gun string is conveyed by tubing or cable, and the perforating gun string is conveyed to the target layer once lowered into the well to complete the perforation operation.

[0003] However, in actual production, the downhole working condition has high temperature and high pressure, and it is usually difficult to solve the problems of reducing frictional resistance, preventing silt from being filled, preventing gravity from reversing, and eccentric rolling and centralizing conveying during the cable conveying of the perforating pipe string of the up-dip angle horizontal well. SUMMARY

[0004] In view of the many deficiencies of the prior art, the present application aims to provide an up-dip angle horizontal well perforating pipe string rolling propelling device to make up for the low screening efficiency of the single degree of freedom vibrating screen and the easy plugging of the screen mesh, and the parallel mechanism has redundant motion components, which can reduce or eliminate the singular position of the mechanism, and the parallel mechanism belongs to a low-coupling topology mechanism, which is beneficial to reducing the complexity of kinematics and dynamics analysis.

[0005] To achieve the above technical purposes, the present application adopts the following technical solutions:

[0006] A rolling propulsion device for a perforating pipe string in an upward-angled horizontal well comprises a perforating gun barrel and a rolling propulsion joint, wherein the rolling propulsion joint is detachably connected between two adjacent perforating gun barrels; the rolling propulsion joint comprises a joint body, a rotating body, a rolling body, a steel ball, and a conductive sealing connection assembly; the rotating body is connected to the side wall of the joint body; the rolling body is rollingly connected to the rotating body via a steel ball; the rolling body is used for supporting and eccentrically straightening the perforating gun barrel string; the conductive sealing assembly is installed inside the joint body. The beneficial effect of this technical solution is that the rolling propulsion joint is detachable and connected between two adjacent perforating gun barrels, reliably supporting the perforating pipe string and achieving eccentric straightening, and is particularly suitable for conveying perforating pipe strings in upward-angled horizontal wells; the provision of the rolling body converts the static friction force experienced by the device during conveyance into rolling friction, thereby reducing the friction of the device during conveyance.

[0007] Furthermore, a mounting portion is provided on a side of the rotating body away from the joint body, the mounting portion being provided with a first annular groove, the rolling element being provided with a second annular groove cooperating with the first annular groove, and the steel ball being installed between the first and second annular grooves so that the rolling element is rollingly connected within the mounting portion. The beneficial effect of this technical solution is that the provision of the first and second annular grooves, combined with the steel balls installed therein, enables the rolling element to be rollingly connected to the rotating body.

[0008] Furthermore, a latch is provided on the rotating body, and the latch is used to limit the rolling body.

[0009] Furthermore, a retaining ring is provided between the rolling element and the rotating element. This technical solution has the beneficial effect of effectively preventing mud and sand from entering between the first ring groove and the second ring groove, avoiding extra wear of the steel ball, and ensuring that the steel ball rolls smoothly between the first ring groove and the second ring groove.

[0010] Furthermore, the retaining ring is made of polytetrafluoroethylene material.

[0011] Furthermore, the rolling body is provided with a connecting hole along the axial direction, an elastic connecting device is provided inside the connecting hole, and the elastic connecting device is in contact with the rotating body through a steel ball.

[0012] Furthermore, the elastic connecting device includes a screw plug, a spring and a spring seat. The screw plug is arranged at the bottom end of the connecting hole. One end of the spring is connected to the screw plug, and the other end is connected to the spring seat. The spring seat is slidably connected to the inside of the connecting hole, and the spring seat is abutted against the side wall of the rotating body through a steel ball.

[0013] Furthermore, the rolling propulsion joint is provided with a backstop groove, which is used to ensure that the pipe string is transported in a predetermined direction. The beneficial effect of this technical solution is that the backstop groove prevents the device from moving backward during the transport process, effectively controlling the transport in the predetermined direction and avoiding reversal.

[0014] Furthermore, the connection between the perforating gun barrel and the rolling propulsion joint is sealed by using threads and a sealing ring. The beneficial effect of this technical solution is that the setting of the sealing ring enables the device to meet the requirements of underground temperature and pressure resistance.

[0015] Furthermore, the rolling propulsion joint is eccentrically arranged in the cement casing.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention provides rolling bodies on both sides of the joint body to support the perforating gun barrel string structure. When conveying the perforating gun barrel string, the rolling bodies roll and convey it. The rolling pushes the joint to eccentrically straighten the perforating gun barrel string and place it in the cement casing, ensuring that no rollover occurs during the conveying process.

[0018] 2. The present invention improves the original static friction conveying form into rolling friction by arranging rolling bodies on both sides of the joint body to support the perforating gun barrel string, thereby reducing the friction resistance during the conveying process, making the conveying process smoother, and reducing the work done during the conveying process, which is beneficial to energy saving and environmental protection; there are rolling bodies on both sides of the rolling propulsion joint, which are driven by steel balls to limit the rolling, and the outer side of the rolling body is additionally fixed by a bayonet pin, which effectively prevents the rolling body from detaching from the joint body during the transmission process and causing accidents.

[0019] 3. The present invention seals the connection between the rolling element and the rotating element through a retaining ring, effectively preventing mud and sand from entering the interior of the device, reducing the possibility of steel ball wear, and ensuring that the steel ball rolls smoothly in the ring groove.

[0020] 4. The present invention uses the anti-retraction groove on the rotating body of the rolling propulsion joint, so that the rolling body and the rotating body of the rolling propulsion joint can rotate in a predetermined direction. The anti-retraction groove structure prevents the backward phenomenon during the conveying process, effectively controlling the conveying in the predetermined direction without reversal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a rolling propulsion device for a perforating pipe string in an upward-dip horizontal well according to the present invention.

[0022] Figure 2 for Figure 1 sectional view of .

[0023] Figure 3 Schematic diagram of the connector body.

[0024] Figure 4 A cross-sectional view of the rolling element.

[0025] Figure 5 is a side view of the rolling body.

[0026] Figure 6 is a sectional view of the rotating body.

[0027] Figure 7 is another sectional view of the rotating body.

[0028] Figure 8 is a D direction view of Figure 7 .

[0029] Figure 9 is an E direction view of Figure 7 .

[0030] Figure 10 is a C direction view of Figure 7 .

[0031] Figure 11 is a F-F sectional view of Figure 8 .

[0032] Figure 12 is a G-G sectional view of Figure 8 .

[0033] In the figure:

[0034] 1 - perforating gun tube; 2 - rolling propelling joint; 3 - joint body; 4 - rotating body; 41 - mounting portion; 42 - first annular groove; 43 - catch pin; 5 - rolling body; 51 - second annular groove; 52 - connecting hole; 53 - elastic connecting device; 531 - screw plug; 532 - spring; 533 - spring seat; 6 - steel ball; 7 - electrically conductive sealing communication assembly; 8 - check ring; 9 - retreat-stop groove; 10 - first plug-in block; 11 - second plug-in block; 12 - first threaded hole; 13 - second threaded hole; 14 - third threaded hole; 15 - half structure; 16 - third plug-in block; 17 - fourth plug-in block; 18 - supplementary block. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Figure 1-12 It is apparent that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] EMBODIMENT

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Figure 1-12The embodiment provides a rolling propulsion device for a perforating pipe string of an up-dip angle horizontal well, which comprises perforating gun pipes 1 and rolling propulsion joints 2, the rolling propulsion joints 2 are detachably connected between two adjacent perforating gun pipes 1; the rolling propulsion joint 2 comprises a joint body 3, a rotating body 4, a rolling body 5, a steel ball 6 and a conductive sealing communication assembly 7; the rotating body 4 is connected to the side wall of the joint body 3; the rolling body 5 is rolling connected with the rotating body 4 through the steel ball 6; the rolling body 5 is used for supporting and eccentrically centralizing the perforating gun pipe string; and the conductive sealing communication assembly 7 is arranged in the joint body 3.

[0038] The rolling propulsion joint 2 and the perforating gun pipe 1 are fastened and sealed through a threaded sealing ring, the rolling bodies arranged on the two sides of the rolling propulsion joint symmetrically support the pipe string structure formed by the plurality of perforating gun pipes 1, the pipe string structure is transported by rotating the rolling bodies, the rolling propulsion joint eccentrically centralizes the pipe string structure in the cement casing, and it is ensured that no side turning occurs in the transportation process.

[0039] The parallel rolling bodies 5 on the two sides of the rolling propulsion joint 2 rolling transport, the original static friction transportation form is improved into rolling friction, the friction resistance in the transportation process is reduced, the transportation process is smoother, the work done in the transportation process is reduced, energy is saved and the environment is protected; the rolling bodies 5 are arranged on the two sides of the rolling propulsion joint 2, the rolling bodies 5 are rolling limited by the steel ball 6, a patch 18 is arranged on the rolling propulsion joint, the patch 18 is located above the cavity formed by the first sliding groove and the second ring groove, the steel ball 6 is assembled into the rotating body 4 and the rolling body 5 through the patch 18, and the rotating body 4 and the rolling body 5 are lubricated by oiling through an oil cup, the rolling bodies are additionally fixed through a clamping pin 43, and accidents caused by the rolling bodies being separated from the joint body during the transmission process are effectively prevented.

[0040] In the embodiment, the rolling bodies 5 are arranged in two, the two rolling bodies 5 are symmetrically arranged on the side wall of the rotating body 4, and fourteen steel balls are arranged between each rotating body and the rolling body to limit and realize relative movement.

[0041] Figure 3 It is a schematic view of the joint body 3.

[0042] The rotating body 4 is provided with a mounting portion 41 on the side away from the joint body 3, the mounting portion 41 is provided with a first ring groove 42, the rolling body 5 is provided with a second ring groove 51 matched with the first ring groove 42, and the steel ball 6 is arranged between the first ring groove 42 and the second ring groove 51 to rolling connect the rolling body 5 in the mounting portion 41.

[0043] As optimization, the rotating body 4 is provided with a bayonet 43 for limiting the rolling body, two bayonets are needed for each rotating body, and four bayonets are provided in the whole device; a check ring 8 is provided between the rolling body 5 and the rotating body 4, and two check rings are provided, the check ring 8 is made of fluorine material, which can seal the rotating body and the rolling body well, effectively preventing the mud from entering the inside and affecting the work of the steel ball.

[0044] The rolling body 5 is provided with a connecting hole 52 in the axial direction, two connecting holes are provided in the embodiment, and the two connecting holes are symmetrically arranged on a circle with a diameter of 47 mm with the rolling body axis as the central axis, the connecting hole 52 is provided with an elastic connecting device 53 inside, the elastic connecting device 53 is in abutment with the rotating body 4 through the steel ball 6; a set of elastic connecting devices are arranged in each connecting hole.

[0045] The elastic connecting device 53 includes a screw plug 531, a spring 532 and a spring seat 533, the screw plug 531 is arranged at the bottom end inside the connecting hole 52, one end of the spring 532 is connected with the screw plug 531, and the other end is connected with the spring seat 533, the spring seat 533 is slidingly connected inside the connecting hole 52, and the spring seat 533 is in abutment with the side wall of the rotating body 4 through the steel ball 6.

[0046] Further, the rotating body is formed by connecting two identical half structures 15, the half structure 15 is a semicircular tile structure, and the half structure 15 is provided with a plug-in block at both ends, and the two half structures 15 can be fixedly connected through the plug-in block and the bolt, Figure 6 and Figure 7 are respectively the sectional views of the connection of the two half structures 15 of the rotating body; in the embodiment, the plug-in blocks of the half structure are divided into a first plug-in block 10 and a second plug-in block 11, the first plug-in block 10 is arranged at one end of the half structure, and the second plug-in block 11 is arranged at the other end of the half structure, the first plug-in block 10 and the second plug-in block 11 cooperate to form a first threaded hole 12 for thread connection of an M8 bolt, the first threaded hole 12 on each plug-in block is provided with two groups, as optimization, a second threaded hole 13 for thread connection of an M5 bolt is further provided between the two groups of first threaded holes 12, the M5 bolt is used for secondary fixation of the M8 bolt, and the stability of the device is improved.

[0047] Further, the two half structures are further provided with a third plug block 16 and a fourth plug block 17, the third plug block 16 and the fourth plug block 17 are matched, and the principle of connecting the first plug block and the second plug block is the same, and the positions of the third plug block and the fourth plug block are perpendicular to the positions of the first plug block and the second plug block, and the third plug block and the fourth plug block jointly form a third threaded hole 14, the third threaded hole 14 is provided for M4 threaded connection, so that the structure of the rotating body is more stable.

[0048] The rolling propulsion joint 2 is provided with a retreat prevention groove 9 for guaranteeing the pipe string to be conveyed in a predetermined direction, in the embodiment, the retreat prevention groove is arranged on the rotating body, the length of the retreat prevention groove is 9.34 mm, and the depth is 1.67 mm, the elastic connecting device on the rolling body is pushed by a spring and a steel ball, the rolling body has two M6 threaded holes as connecting holes, the two threaded holes are spaced apart by 180°, and each threaded hole is internally provided with one Φ5 steel ball, one elastic seat, one spring and one M6 plug. The rolling body and the rotating body of the rolling propulsion joint can be rotated in a predetermined direction, the retreat prevention groove structure prevents the reverse phenomenon in the conveying process, effectively controls the conveying in a predetermined direction, and has no reverse rotation.

[0049] The rolling propulsion joint 2 is eccentrically arranged in the cement casing pipe, various working conditions are used, and the practicality of the device is improved.

[0050] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the above-described embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rolling propulsion device for perforating pipe strings in upward-inclined horizontal wells, characterized in that: The invention comprises a perforating gun barrel and a rolling propulsion joint, wherein the rolling propulsion joint is detachably connected between two adjacent perforating gun barrels; the rolling propulsion joint comprises a joint body, a rotating body, a rolling body, a steel ball and a conductive sealing connection component; the rotating body is connected to the side wall of the joint body; the rolling body is rollingly connected to the rotating body via the steel ball, and the rolling body is used for supporting the perforating gun barrel string and eccentrically straightening; the conductive sealing connection component is installed inside the joint body; A mounting portion is provided on a side of the rotating body away from the joint body, the mounting portion is provided with a first annular groove, the rolling body is provided with a second annular groove matching the first annular groove, the steel ball is installed between the first annular groove and the second annular groove so that the rolling body is rollingly connected in the mounting portion; The rolling body is provided with a connecting hole along the axial direction, an elastic connecting device is provided inside the connecting hole, and the elastic connecting device is in contact with the rotating body through a steel ball; The elastic connection device includes a screw plug, a spring and a spring seat, wherein the screw plug is arranged at the bottom end of the connecting hole, one end of the spring is connected to the screw plug, and the other end is connected to the spring seat, the spring seat is slidably connected to the inside of the connecting hole, and the spring seat abuts against the side wall of the rotating body through a steel ball; The rolling propulsion joint is provided with a backstop groove, which is used to ensure that the pipe string is transported in a predetermined direction.

2. The rolling propulsion device for up-dip horizontal well perforating pipe string according to claim 1, characterized in that: The rotating body is provided with a latch, and the latch is used to limit the rolling body.

3. The rolling propulsion device for up-dip horizontal well perforating pipe string according to claim 2, characterized in that: A retaining ring is provided between the rolling element and the rotating element.

4. The rolling propulsion device for up-dip horizontal well perforating pipe string according to claim 3, characterized in that: The retaining ring is made of tetrafluoroethylene material.

5. The rolling propulsion device for up-dip horizontal well perforating pipe string according to claim 1, characterized in that: The connection between the perforating gun barrel and the rolling propulsion joint is sealed by adopting threads and sealing rings.

6. The rolling propulsion device for up-dip horizontal well perforating pipe string according to claim 1, characterized in that: The rolling propulsion joint is eccentrically arranged in the cement casing.

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