CN111550212B - A pre-set downhole choke electric fishing tool and fishing method thereof - Google Patents
A pre-set downhole choke electric fishing tool and fishing method thereof Download PDFInfo
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- CN111550212B CN111550212B CN202010522223.XA CN202010522223A CN111550212B CN 111550212 B CN111550212 B CN 111550212B CN 202010522223 A CN202010522223 A CN 202010522223A CN 111550212 B CN111550212 B CN 111550212B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 210000000078 claw Anatomy 0.000 claims abstract description 51
- 239000004519 grease Substances 0.000 claims abstract description 14
- 230000001050 lubricating effect Effects 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims description 61
- 238000010008 shearing Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 239000003921 oil Substances 0.000 claims description 8
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Marine Sciences & Fisheries (AREA)
- Earth Drilling (AREA)
- Fishing Rods (AREA)
Abstract
本发明提供了一种预置式井下节流器电动打捞工具及其打捞方法，包括自上至下依次连接的上接头、外筒、下接头、下压帽和工作外筒，下压帽的下端面抵接压套，压套的外壁套设有卡爪座，卡爪座嵌装有卡爪，外筒内安装有电机，电机的空心转子轴内贯通旋接有丝杆，丝杆连接中心顶杆，中心顶杆可插入节流器解封节流器。本发明依靠电机正反转提供动力，带动节流器中心顶杆的上下往复运动，直至中心顶杆进入预置式井下节流器内部，实现对在役状态的预置式井下节流器的解封；外筒的内腔可作为润滑油脂的储存空间，在打捞过程中可将储存在其中的润滑油脂挤入油管与节流器之间，降低打捞摩擦阻力，提高打捞成功率。
The present invention provides a pre-set downhole throttle electric salvage tool and a salvage method thereof, comprising an upper joint, an outer tube, a lower joint, a lower pressure cap and a working outer tube connected in sequence from top to bottom, the lower end face of the lower pressure cap abuts against a press sleeve, the outer wall of the press sleeve is provided with a claw seat, the claw seat is embedded with a claw, a motor is installed in the outer tube, a screw rod is passed through and rotatably connected in the hollow rotor shaft of the motor, the screw rod is connected to a central push rod, and the central push rod can be inserted into the throttle to unseal the throttle. The present invention relies on the forward and reverse rotation of the motor to provide power, drive the up and down reciprocating motion of the central push rod of the throttle until the central push rod enters the inside of the pre-set downhole throttle, and realizes the unsealing of the pre-set downhole throttle in service; the inner cavity of the outer tube can be used as a storage space for lubricating grease, and the lubricating grease stored therein can be squeezed into the oil pipe and the throttle during the salvage process, reducing the salvage friction resistance and improving the success rate of salvage.
Description
Technical Field
The invention belongs to the field of downhole operation tools, and particularly relates to an electric fishing tool of a preset downhole choke and a fishing method thereof.
Background
At present, the underground throttling technology becomes one of key technologies for developing low-pressure and low-yield gas fields, is widely applied in the early stage of gas well production, has an important function of low-pressure gas collection, and is an important means for economically and effectively developing the low-pressure and low-yield gas fields. Therefore, the preset downhole choke is widely applied in the early development stage of low-pressure and low-yield gas fields, and is mainly characterized in that when a production tubing string is put into the production tubing string, the preset working cylinder is connected at a proper position, the preset working cylinder is put into a gas well along with the production tubing, and the downhole choke is put into the preset working cylinder for clamping and sealing when production is required, so that the purposes of throttling and depressurization production of the gas well are achieved.
However, in the later stage of gas field production, the production is reduced due to the fact that stratum water is immersed into a shaft, and technological measures such as drainage gas production are needed, so that the restrictor needs to be fished out. However, in the exploitation process of the gas field, due to reasons of underground sand production, scaling, corrosion and the like, the problems of high difficulty and low success rate of salvaging the underground throttler exist in part of the wells. If timely salvage of the downhole choke cannot be realized, drainage and gas production measures such as foam drainage, speed pipe columns, plunger gas lift and the like can not be implemented in part of low-pressure water and gas production wells, so that the gas well is low in yield or is stopped. Finally, taking out the throttler requires measures such as well-killing and tubing string lifting or tubing string lifting with pressure, and the measures are expensive and have high drilling sticking and high well control safety risks.
Disclosure of Invention
The embodiment of the invention provides an electric fishing tool for a preset downhole choke and a fishing method thereof, which aims at solving the problem of high cost of the existing measure for fishing the choke and solves the problem of drill sticking risk of the existing measure for fishing the choke.
In order to solve the technical problems, the invention provides an electric fishing tool for a preset downhole choke, which comprises an upper joint, an outer cylinder, a lower joint, a lower pressing cap and a working outer cylinder which are sequentially connected from top to bottom, wherein the lower end surface of the lower pressing cap is abutted against a pressing sleeve, the outer wall of the pressing sleeve is sleeved with a claw seat, and the claw seat is embedded with a claw;
a motor is arranged in the outer cylinder, a screw rod is connected in a through and rotary way in a hollow rotor shaft of the motor, the lower end of the screw rod is coaxially and fixedly connected with a central ejector rod, a sheath is sleeved on the central ejector rod, the outer wall of the sheath is connected with the inner wall of a lower joint, and the lower joint is fixed with a lower pressing cap through a shearing pin;
The outer wall of the sheath, the inner wall of the downward pressing cap and the cavity formed by the upper end face of the pressing sleeve are internally provided with large springs which are in a compressed state and sleeved on the sheath, the cavity formed by the outer wall of the pressing sleeve, the inner wall of the working outer cylinder and the upper end face of the claw seat is internally provided with small springs which are in a compressed state and sleeved on the pressing sleeve, and the elasticity of the small springs is smaller than that of the large springs.
Further, solid grease is stored in the outer cylinder, and is extruded into an oil pipe and a preset downhole choke under the up-and-down reciprocating motion of the central ejector rod.
Preferably, the pressing cap is of a hollow cylindrical structure, the middle section of the inner wall of the hollow cylinder extends towards the central axis along the radial direction to form a circle of annular boss, the bottom end surface of the lower connector is abutted against the upper table surface of the annular boss, the lower table surface of the annular boss, the inner wall of the hollow cylinder below the annular boss, the upper end surface of the pressing sleeve and the outer wall of the sheath form an annular cavity, and the large spring is compressed and arranged in the annular cavity.
Further, the outer cylinder is internally provided with a centralizing block, the centralizing block is sleeved at the joint of the screw rod and the central ejector rod, the centralizing block is positioned below the fixing seat, and the fixing seat is connected with the centralizing block through a screw.
Preferably, the fixing seat is formed by splicing two semi-annular structures in pairs, and the inner wall of the annular structure formed by splicing in pairs is connected with the screw rod in a screwed mode.
Further, the motor is a stepping motor capable of rotating forward and backward.
The invention also protects a salvaging method of the electric salvaging tool of the preset downhole choke, which comprises the following steps:
the motor is connected with the motor through a logging cable and the preset type downhole choke electric fishing tool is lowered to the position above the preset type downhole choke, then the preset type downhole choke electric fishing tool is lifted up, the claw grabs the preset type downhole choke fishing neck, the motor drives the center ejector rod to move downwards through the screw rod, the center ejector rod is inserted into the center hole of the preset type downhole choke, the choke is forced to be unsealed, and the preset type downhole choke can be lifted up by the electric fishing tool.
Further, the claw is grabbed and is presetted downhole choke ware salvage neck specifically includes:
And (3) lowering the preset downhole choke electric fishing tool until the claw touches the preset downhole choke fishing neck, enabling the claw to move upwards by the upward thrust of the preset downhole choke, continuously extruding the small spring by the claw seat, and opening and grabbing the fishing neck by the upward thrust of the fishing neck.
Further, if the preset downhole choke fails to be unsealed, the shearing pin is disconnected by automatic releasing through rotation of a motor or upward jarring releasing through a logging cable, the elastic force of the large spring is released, the pressing sleeve moves downwards, the claw seat moves downwards along with the pressing sleeve, the claw releases the salvaging neck, and then the preset downhole choke electric salvaging tool can be taken out.
Further, in the salvaging process, the center ejector rod is driven to reciprocate up and down through the positive and negative rotation of the motor, the solid lubricating grease is extruded to move down, and the inner wall of the lubricating oil pipe and the outer surface of the preset underground throttle are arranged.
The beneficial effects of the invention are as follows:
(1) The electric fishing tool for the preset underground throttle device is powered by forward and backward rotation of a motor to drive the central ejector rod of the throttle device to reciprocate up and down until the central ejector rod enters the preset underground throttle device (the original throwing tool position), so that the in-service preset underground throttle device is unsealed.
(2) The inner cavity of the outer barrel can be used as a storage space for lubricating grease, the lubricating grease stored in the inner cavity can be extruded between the oil pipe and the throttle in the salvaging process, the salvaging friction resistance is reduced, and the salvaging success rate is improved.
(3) The electric fishing tool for the preset underground throttle has the advantages of simple structure, easy operation method, bidirectional releasing function and capability of meeting the requirements of the gas field preset underground throttle on the safe, reliable and low-cost fishing technology and economy.
In order to make the above-mentioned objects of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is an elevation view of a pre-set downhole choke powered fishing tool.
Fig. 2 is a partial enlarged view of a in fig. 1.
Reference numerals illustrate:
1. An upper joint; 2, an outer cylinder; the hydraulic jack comprises a motor 3, a screw rod 4, a fixing seat 5, a centralizing block 6, a lower joint 7, a shearing pin 8, a pressing cap 9, a large spring 10, a pressing sleeve 11, a central ejector rod 12, a small spring 13, a jaw seat 14, a working outer cylinder 15, a sheath 16 and a jaw 17.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples.
In the present invention, the up, down, left and right directions in the drawings are regarded as the up, down, left and right directions of the electric fishing tool with the preset downhole choke described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
First embodiment:
The first embodiment of the invention relates to an electric fishing tool for a preset downhole choke, which is shown in fig. 1, and comprises an upper joint 1, an outer cylinder 2, a lower joint 7, a lower pressing cap 9 and a working outer cylinder 15 which are sequentially connected from top to bottom, wherein the lower end surface of the lower pressing cap 9 is abutted against a pressing sleeve 11, the outer wall of the pressing sleeve 11 is sleeved with a claw seat 14, and the claw seat 14 is embedded with a claw 17;
The motor 3 is arranged in the outer cylinder 2, a screw rod 4 is connected in a penetrating and rotating way in a hollow rotor shaft of the motor 3, the lower end of the screw rod 4 is coaxially and fixedly connected with a central ejector rod 12, a sheath 16 is sleeved on the central ejector rod 12, the outer wall of the sheath 16 is connected with the inner wall of the lower joint 7, and the lower joint 7 and the lower pressing cap 9 are fixed through a shearing pin 8;
Wherein, the cavity formed by the outer wall of the sheath 16, the inner wall of the lower pressing cap 9 and the upper end surface of the pressing sleeve 11 is internally provided with a big spring 10 which is in a compressed state and sleeved on the sheath 16, the cavity formed by the outer wall of the pressing sleeve 11, the inner wall of the working outer cylinder 15 and the upper end surface of the jaw seat 14 is internally provided with a small spring 13 which is in a compressed state and sleeved on the pressing sleeve 11, and the elasticity of the small spring 13 is smaller than that of the big spring 10.
The working principle of the electric fishing tool of the preset downhole choke is as follows:
The fishing process comprises the steps of connecting a motor 3 through a logging cable, lowering an electric fishing tool of the preset downhole choke to the position above the preset downhole choke, lifting the electric fishing tool of the preset downhole choke, grabbing a fishing neck of the preset downhole choke by a claw 17, driving a central ejector rod 12 to move downwards by the motor 3 through a screw rod 4, inserting the central ejector rod 12 into a central hole of the preset downhole choke, forcing the choke to be unsealed, and lifting the electric fishing tool of the preset downhole choke to lift the preset downhole choke.
And in the deblocking process, the preset downhole choke is lowered to the electric fishing tool until the claw 17 touches the fishing neck of the preset downhole choke, the claw 17 moves upwards by the upward thrust of the preset downhole choke, the claw seat 14 continuously presses the small spring 13, and the claw 17 is opened by the upward thrust of the fishing neck to grasp the fishing neck.
If the preset downhole choke fails to be unsealed, the shearing pin 8 is disconnected by automatic releasing through rotation of the motor 3 or upward jarring releasing through a logging cable, the elastic force of the large spring 10 is released, the pressing sleeve 11 moves downwards due to the fact that the elastic force of the large spring 10 is larger than that of the small spring 13, the claw seat 14 moves downwards along with the pressing sleeve 11, and the claw 17 releases the salvaging neck, so that the preset downhole choke electric salvaging tool can be taken out.
The logging cable is connected with the motor 3 to supply power to the motor 3, the hollow rotor shaft of the logging cable rotates, the screw rod 4 in the hollow rotor shaft rotates, and the screw rod 4 and the fixed seat 5 form a screw-nut pair, so that the screw rod 4 converts rotary motion into linear motion, and the central ejector rod 12 below the screw rod is also reciprocated up and down along with the linear motion until the central ejector rod 12 is inserted into the central hole of the preset downhole choke, and the electric deblocking of the preset downhole choke is realized.
Second embodiment:
The embodiment relates to an electric fishing tool for a preset downhole choke, which is shown in fig. 1, and comprises an upper joint 1, an outer barrel 2, a lower joint 7, a lower pressing cap 9 and a working outer barrel 15 which are sequentially connected from top to bottom, wherein the lower end surface of the lower pressing cap 9 is abutted against a pressing sleeve 11, the outer wall of the pressing sleeve 11 is sleeved with a claw seat 14, and a claw 17 is embedded in the claw seat 14;
the motor 3 is arranged in the outer cylinder 2, the screw rod 4 is connected in a penetrating and rotating way in the hollow rotor shaft of the motor 3, the screw rod 4 is sleeved with a fixed seat 5 fixed on the inner wall of the outer cylinder 2 in a rotating way, the lower end of the screw rod 4 is coaxially and fixedly connected with a central ejector rod 12, the central ejector rod 12 is sleeved with a sheath 16, the outer wall of the sheath 16 is connected with the inner wall of the lower joint 7, and the lower joint 7 and the lower pressing cap 9 are fixed through a shearing pin 8;
Wherein, referring to fig. 2, the cavity formed by the outer wall of the sheath 16, the inner wall of the pressing cap 9 and the upper end surface of the pressing sleeve 11 is internally provided with a large spring 10 which is in a compressed state and sleeved on the sheath 16, the cavity formed by the outer wall of the pressing sleeve 11, the inner wall of the working outer cylinder 15 and the upper end surface of the jaw seat 14 is internally provided with a small spring 13 which is in a compressed state and sleeved on the pressing sleeve 11, and the elasticity of the small spring 13 is smaller than that of the large spring 10.
The solid lubricating grease is stored in the outer barrel 2, is extruded into an oil pipe and a preset downhole throttle under the up-and-down reciprocating motion of the central ejector rod 12, specifically, in the salvage process, the motor 3 rotates forwards and backwards to drive the central ejector rod 12 to reciprocate up and down, the solid lubricating grease is extruded and slowly moves downwards to lubricate a salvage tool, and is gradually extruded into the throttle grabbed by the clamping jaw 17 when moving to the lower part of the salvage tool, and is also extruded into the oil pipe to lubricate the outer surface of the throttle and the inner wall of the oil pipe, so that the salvage friction resistance is reduced, and the salvage success rate is improved.
As shown in fig. 1, the pressing cap 9 is a hollow cylindrical structure, the middle section of the inner wall of the hollow cylinder extends towards the central axis along the radial direction to form a circle of annular boss, the bottom end surface of the lower joint 7 is abutted against the upper table surface of the annular boss, the lower table surface of the annular boss, the inner wall of the hollow cylinder below the annular boss, the upper end surface of the pressing sleeve 11 and the outer wall of the sheath 16 form an annular cavity, and the large spring 10 is compressed and placed in the annular cavity.
In order to ensure the stable connection of the screw rod 4 and the central ejector rod 12 and reduce eccentric wear, the outer cylinder 2 is internally provided with a centralizing block 6, the centralizing block 6 is sleeved at the connection part of the screw rod 4 and the central ejector rod 12, the upper part of the centralizing block 6 is provided with a fixing seat 5 which is sleeved on the screw rod 4 and is fixed on the inner wall of the outer cylinder 2, and the fixing seat 5 is connected with the centralizing block 6 through screws.
In order to facilitate disassembly and assembly, the fixing seat 5 is preferably formed by butt-jointing two semi-annular structures, and the inner wall of the butt-jointed annular structure is in screwed connection with the screw rod 4.
In the present embodiment, the motor 3 is a stepping motor that can be rotated forward and backward, such as a ball screw stepping motor or a through screw stepping motor.
Third embodiment:
The embodiment provides a salvaging method of an electric salvaging tool of a preset downhole choke, which comprises the following steps:
The motor 3 is connected with the motor 3 through a logging cable, the preset type downhole choke electric fishing tool is lowered to the position above the preset type downhole choke, then the preset type downhole choke electric fishing tool is lifted up, the claw 17 grabs the preset type downhole choke fishing neck, the motor 3 drives the central ejector rod 12 to move downwards through the screw rod 4, the central ejector rod 12 is inserted into a central hole of the preset type downhole choke, the choke is forced to be unsealed, and the preset type downhole choke can be lifted up by the electric fishing tool.
The electric fishing tool of the preset downhole choke comprises an upper joint 1, an outer barrel 2, a lower joint 7, a lower pressing cap 9 and a working outer barrel 15 which are sequentially connected from top to bottom, wherein the lower end surface of the lower pressing cap 9 is abutted against a pressing sleeve 11, a claw seat 14 is sleeved on the outer wall of the pressing sleeve 11, and a claw 17 is embedded in the claw seat 14;
the motor 3 is arranged in the outer cylinder 2, the screw rod 4 is connected in a penetrating and rotating way in the hollow rotor shaft of the motor 3, the screw rod 4 is sleeved with a fixed seat 5 fixed on the inner wall of the outer cylinder 2 in a rotating way, the lower end of the screw rod 4 is coaxially and fixedly connected with a central ejector rod 12, the central ejector rod 12 is sleeved with a sheath 16, the outer wall of the sheath 16 is connected with the inner wall of the lower joint 7, and the lower joint 7 and the lower pressing cap 9 are fixed through a shearing pin 8;
Wherein, the cavity formed by the outer wall of the sheath 16, the inner wall of the lower pressing cap 9 and the upper end surface of the pressing sleeve 11 is internally provided with a big spring 10 which is in a compressed state and sleeved on the sheath 16, the cavity formed by the outer wall of the pressing sleeve 11, the inner wall of the working outer cylinder 15 and the upper end surface of the jaw seat 14 is internally provided with a small spring 13 which is in a compressed state and sleeved on the pressing sleeve 11, and the elasticity of the small spring 13 is smaller than that of the big spring 10.
Fourth embodiment:
The embodiment provides a salvaging method of an electric salvaging tool of a preset downhole choke, which comprises the following steps:
The motor 3 is connected with the motor 3 through a logging cable, the preset type downhole choke electric fishing tool is lowered to the position above the preset type downhole choke, then the preset type downhole choke electric fishing tool is lifted up, the claw 17 grabs the preset type downhole choke fishing neck, the motor 3 drives the central ejector rod 12 to move downwards through the screw rod 4, the central ejector rod 12 is inserted into a central hole of the preset type downhole choke, the choke is forced to be unsealed, and the preset type downhole choke can be lifted up by the electric fishing tool.
The claw 17 is grabbed the preset downhole choke salvaging neck specifically includes:
The electric fishing tool of the preset downhole choke is lowered until the claw 17 touches the fishing neck of the preset downhole choke, the claw 17 moves upwards by the upward thrust of the preset downhole choke, the claw seat 14 continuously presses the small spring 13, and the claw 17 is opened by the upward thrust of the fishing neck to grasp the fishing neck.
If the preset downhole choke is failed to be unsealed, the shearing pin 8 is disconnected by automatic releasing through rotation of the motor 3 or upward jarring releasing through a logging cable, the elastic force of the large spring 10 is released, the pressing sleeve 11 moves downwards, the claw seat 14 moves downwards along with the pressing sleeve 11, the claw 17 loosens the salvaging neck, and the preset downhole choke electric salvaging tool can be taken out at the moment.
The releasing mode is realized by a motor or by upward jarring, so that the embodiment has a bidirectional releasing function and can meet the requirements of the salvaging of the preset underground throttle device of the gas field on the salvaging technology and economy with safety, reliability and low cost.
In the salvaging process, the center ejector rod 12 is driven to reciprocate up and down by the positive and negative rotation of the motor 3, the solid lubricating grease is extruded to move down, and the inner wall of the lubricating oil pipe and the outer surface of the preset downhole choke are arranged.
In the salvage process, the forward and backward rotation of the motor 3 drives the central ejector rod 12 to reciprocate up and down, the solid lubricating grease is extruded and slowly moves down to lubricate the salvage tool, and when moving to the lower part of the salvage tool, the solid lubricating grease is gradually extruded into the throttler grasped by the claw 17 and the oil pipe to lubricate the outer surface of the throttler and the inner wall of the oil pipe, thereby reducing the salvage friction resistance and improving the salvage success rate.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (5)
1. The utility model provides a salvage method of preset formula downhole choke ware electric fishing tool, utilizes preset formula downhole choke ware electric fishing tool to realize salvaging, its characterized in that:
The electric fishing tool of the preset downhole choke comprises an upper joint (1), an outer barrel (2), a lower joint (7), a lower pressing cap (9) and a working outer barrel (15) which are sequentially connected from top to bottom, wherein the lower end face of the lower pressing cap (9) is abutted to a pressing sleeve (11), a claw seat (14) is sleeved on the outer wall of the pressing sleeve (11), and a claw (17) is embedded in the claw seat (14);
A motor (3) is arranged in the outer cylinder (2), a screw rod (4) is connected in a through and rotary manner in a hollow rotor shaft of the motor (3), the lower end of the screw rod (4) is coaxially and fixedly connected with a central ejector rod (12), a sheath (16) is sleeved on the central ejector rod (12), the outer wall of the sheath (16) is connected with the inner wall of a lower joint (7), and the lower joint (7) and a lower pressing cap (9) are fixed through a shearing pin (8);
The large spring (10) sleeved on the sheath (16) in a compressed state is arranged in a cavity formed by the outer wall of the sheath (16), the inner wall of the downward pressing cap (9) and the upper end face of the pressing sleeve (11), the small spring (13) sleeved on the pressing sleeve (11) in a compressed state is arranged in a cavity formed by the outer wall of the pressing sleeve (11), the inner wall of the working outer cylinder (15) and the upper end face of the claw seat (14), and the elasticity of the small spring (13) is smaller than that of the large spring (10);
the outer barrel (2) is internally stored with solid lubricating grease, and the solid lubricating grease is extruded into an oil pipe and a preset downhole choke under the up-and-down reciprocating motion of the central ejector rod (12);
the salvaging method comprises the following steps:
The motor (3) drives the central ejector rod (12) to move downwards through the screw rod (4), the central ejector rod (12) is inserted into a central hole of the preset downhole choke, the choke is forced to be unsealed, and the preset downhole choke can be lifted up by the electric fishing tool;
the claw (17) is grabbed the preset formula downhole choke and is salvaged the neck specifically and include:
The electric fishing tool of the preset downhole choke is lowered until the claw (17) touches the fishing neck of the preset downhole choke, the claw (17) moves upwards under the upward thrust of the preset downhole choke, the claw seat (14) continuously extrudes the small spring (13), and the claw (17) opens and grabs the fishing neck under the upward thrust of the fishing neck;
If the preset downhole choke fails in deblocking, the shearing pin (8) is disconnected by automatic releasing through rotation of the motor (3) or upward jarring releasing through a logging cable, the elastic force of the large spring (10) is released, the pressing sleeve (11) moves downwards due to the fact that the elastic force of the large spring (10) is larger than that of the small spring (13), the claw seat (14) moves downwards along with the pressing sleeve (11), the claw (17) releases the salvaging neck, and then the preset downhole choke electric salvaging tool can be taken out;
In the salvaging process, the center ejector rod (12) is driven to reciprocate up and down through the positive and negative rotation of the motor (3), solid lubricating grease is extruded to move down, and the inner wall of the lubricating oil pipe and the outer surface of the preset underground throttle are extruded.
2. The method for fishing the electric fishing tool of the preset downhole choke in claim 1, wherein the pressing cap (9) is of a hollow cylindrical structure, the middle section of the inner wall of the hollow cylinder extends towards the central axis along the radial direction to form a circle of annular boss, the bottom end surface of the lower joint (7) is abutted against the upper table surface of the annular boss, the lower table surface of the annular boss, the inner wall of the hollow cylinder below the annular boss, the upper end surface of the pressing sleeve (11) and the outer wall of the sheath (16) form an annular cavity, and the large spring (10) is compressed and placed in the annular cavity.
3. The method for fishing the electric fishing tool of the preset downhole choke in the outer barrel (2) is characterized in that a centralizing block (6) is further arranged in the outer barrel (2), the centralizing block (6) is sleeved at the joint of the screw rod (4) and the central ejector rod (12), a fixing seat (5) which is sleeved on the screw rod (4) and is fixed on the inner wall of the outer barrel (2) is arranged above the centralizing block (6), and the fixing seat (5) is connected with the centralizing block (6) through screws.
4. A fishing method for an electric fishing tool for a preset downhole choke in accordance with claim 3, wherein the fixing seat (5) is formed by splicing two semi-annular structures, and the inner wall of the annular structure formed by splicing is in screwed connection with the screw rod (4).
5. The method for fishing the electric fishing tool of the preset downhole choke according to claim 1, wherein the motor (3) is a stepping motor capable of rotating forward and backward.
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| CN112096332B (en) * | 2020-08-21 | 2022-05-06 | 中石化石油工程技术服务有限公司 | Radioactive source fishing device |
| CN112943142B (en) * | 2021-01-12 | 2022-11-04 | 中国石油天然气股份有限公司 | Device and method for unsealing restrictor through eccentric vibration |
| CN113294128A (en) * | 2021-06-23 | 2021-08-24 | 中国石油天然气股份有限公司长庆油田分公司第三采气厂 | Electric control throttle for gas well |
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| CN212671643U (en) * | 2020-06-10 | 2021-03-09 | 中国石油天然气股份有限公司 | Electric fishing tool for preset underground throttler |
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| US8230932B2 (en) * | 2010-11-30 | 2012-07-31 | Sondex Wireline Limited | Multifunction downhole release tool mechanism with lost motion |
| CN106593341B (en) * | 2016-12-23 | 2019-01-18 | 中国石油天然气股份有限公司 | Hydraulic restrictor fishing tool and operation method thereof |
| CN107676054B (en) * | 2017-10-25 | 2023-11-28 | 中国石油天然气股份有限公司 | Downhole choke fishing tool and operation method |
| CN109057761B (en) * | 2018-08-14 | 2020-09-29 | 哈尔滨艾拓普科技有限公司 | Natural gas well underground throttle for electric control throwing and fishing |
| CN210049855U (en) * | 2019-06-17 | 2020-02-11 | 哈尔滨艾拓普科技有限公司 | Natural gas well downhole choke and automatically controlled ware of dragging for |
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