阅读说明：本技术 一种井下震击解卡装置及其使用方法 (Underground jarring jam releasing device and using method thereof ) 是由 张化强 张全胜 张峰 姜广彬 张瑞霞 田浩然 周景彩 刘永顺 于 2019-09-30 设计创作，主要内容包括：本发明是一种井下震击解卡装置及其使用方法,震击解卡装置包括震击控制器和井下震击器,震击控制器通过电缆与井下震击器连接；井下震击器设有内筒和外筒,外筒两端分别与震击器上接头和震击器下接头连接,外筒的内腔中装有蓄能电容；内筒内装有缠绕着感应线圈的震击块、外部固定着驱动线圈,蓄能电容通过电缆与位于地面的震击控制器连接,驱动线圈通过导线与蓄能电容连接,蓄能电容设有液流孔。将震击解卡装置通过下井管柱下至鱼顶并通过打捞工具捞住落鱼震击解卡。本发明适用于井下管柱的解卡作业,尤其适于水平井内防砂管柱和钻井管柱的解卡作业,能够产生显著的使用效果,提高解卡施工效率和解卡成功率。(The invention relates to an underground jarring stuck-releasing device and a using method thereof, wherein the jarring stuck-releasing device comprises a jar controller and an underground jar, and the jar controller is connected with the underground jar through a cable; the underground jar is provided with an inner cylinder and an outer cylinder, two ends of the outer cylinder are respectively connected with an upper joint of the jar and a lower joint of the jar, and an inner cavity of the outer cylinder is internally provided with an energy storage capacitor; the inner cylinder is internally provided with a shock block wound with an induction coil, and a driving coil is fixed outside the inner cylinder, the energy storage capacitor is connected with a shock controller on the ground through a cable, the driving coil is connected with the energy storage capacitor through a lead, and the energy storage capacitor is provided with a liquid flow hole. And (4) descending the jarring stuck-releasing device to the top of the fish through a well descending pipe column and fishing the fallen fish through a fishing tool to jar and release the stuck fish. The pipe column releasing device is suitable for releasing the stuck pipe column in the well, is particularly suitable for releasing the stuck pipe column of a sand control pipe column and a drilling pipe column in a horizontal well, can generate obvious using effect, and improves the releasing construction efficiency and the releasing success rate.)

1. An underground jarring stuck-releasing device is characterized by comprising a jar controller (1) and an underground jar (5), wherein the jar controller (1) is connected with the underground jar (5) through a cable (2); the underground jar (5) is provided with an inner cylinder (5.3) and an outer cylinder (5.2), two ends of the outer cylinder (5.2) are respectively connected with an upper joint (5.1) and a lower joint (5.10) of the jar, a partition table is arranged in an inner cavity of the outer cylinder (5.2), the inner cylinder (5.3) is arranged in an inner cavity above the partition table, and an energy storage capacitor is arranged in an inner cavity below the partition table; the energy storage capacitor is connected with a shock controller (1) located on the ground through a cable (2), the driving coil is connected with the energy storage capacitor through a lead, and the energy storage capacitor is provided with a liquid flow hole.

2. The underground jarring stuck releasing device of claim 1, wherein the energy storage capacitor is at least provided with one stage, the energy storage capacitors are respectively a primary energy storage capacitor (5.8) and a secondary energy storage capacitor (5.9), the primary energy storage capacitor (5.8) and the secondary energy storage capacitor (5.9) are connected with the cable (2) in parallel, and liquid flow holes of the primary energy storage capacitor (5.8) and the secondary energy storage capacitor (5.9) are communicated with a central hole of an intermediate platform in an inner cavity of the outer cylinder (5.2), a central hole of the inner cylinder (5.3), and central holes of the upper jar connector (5.1) and the lower jar connector (5.10).

3. A downhole jarring stuck freeing device according to claim 2, wherein the number of the drive coils is equal to the number of the energy storage capacitors, and the drive coils are respectively a primary drive coil (5.7) and a secondary drive coil (5.4), and the primary drive coil (5.7) and the secondary drive coil (5.4) are respectively connected with the primary energy storage capacitor (5.8) and the secondary energy storage capacitor (5.9) through wires.

4. The downhole jarring stuck-releasing device of claim 1, wherein the middle of the jar block (5.5) has a small outer diameter, two ends of the jar block are hammer-shaped, and the induction coil (5.6) is wound on the middle of the outer wall of the jar block (5.5).

5. A downhole jarring freeing device as claimed in claim 4, characterised in that the lower part of the inner cavity of the inner cylinder (5.3) is a jar block seat provided with a central hole, the upper end of which is provided with a chamfer cooperating with the lower part of the jar block (5.5).

6. A downhole jar jam release device as claimed in claim 5, wherein the distance from the jar block seat to the top of the inner barrel (5.3) is set between 3m and 5 m; the primary drive coil (5.7) and the secondary drive coil (5.4) are respectively fixed at the lower part and the middle part of the outer wall of the inner cylinder (5.3) and positioned at two sides of the shock block (5.5).

7. The downhole jarring stuck-releasing device of claim 2, wherein cable through holes are arranged in the lower body of the jar upper joint (5.1) and the separating table in the outer cylinder (5.2), and the cable (2) passes through the lower well string (3), the jar upper joint (5.1) and the outer cylinder (5.2) and is connected with the primary energy storage capacitor (5.8) and the secondary energy storage capacitor (5.9); a cable through hole in the upper connector (5.1) of the jar is obliquely arranged at the lower part of the body of the upper connector (5.1) of the jar, so that an outlet of the cable through hole is tightly attached to the inner wall of the outer cylinder (5.2); the cable through hole in the outer cylinder (5.2) partition table is tightly attached to the inner wall of the outer cylinder (5.2).

8. A downhole jarring freeing device as claimed in claim 7, wherein the downhole tubular string (3) is coiled tubing.

9. The downhole jarring stuck-freeing device of claim 1, wherein a control chip is installed in the jar controller (1) and at least two power interfaces are provided, and the cable (2) is connected with the control chip; the jar controller (1) can be connected with an external power supply and charges the energy storage capacitor through the cable (2).

10. The downhole jarring stuck-releasing device of claim 8, characterized in that a shock absorber (4) is further connected between the downhole tubular column (3) and the downhole jar (5), the shock absorber (4) is provided with an upper shock absorber connector (4.1), a shock absorbing spring (4.2) and a lower shock absorber connector (4.3), an inner cavity of the upper shock absorber connector (4.1) is provided with a shock absorbing partition, the lower shock absorber connector (4.3) is provided with a central hole, an upper end part is hung on the shock absorbing partition, and the shock absorbing spring (4.2) is installed between the lower part of the shock absorbing partition and a lower body of the lower shock absorber connector (4.3).

11. The downhole jarring stuck-releasing device of claim 10, wherein an inner cavity of the upper shock absorber connector (4.1) is provided with internal threads to be connected with a downhole tubular column (3), and an outer circle of the lower shock absorber connector (4.3) is provided with external threads to be connected with the upper shock absorber connector (5.1); the height of an inner cavity above the shock absorption isolation platform in the shock absorber upper joint (4.1) is larger than that of the shock absorption spring (4.2) when the shock absorption spring is not compressed.

12. The use method of the downhole jarring stuck freeing device as recited in claim 10, comprising:

A. the underground jarring jam releasing device is inspected and assembled on the ground, and the lower end of a jar lower connector (5.10) of the underground jar (5) is connected with a fishing tool;

B. the underground jarring unfreezing device is lowered to the top of the fish through a well lowering pipe column (3), and the fish is fished up through a fishing tool;

C. the underground jar is characterized in that the jar controller (1) is connected with an external power supply, the energy storage capacitor is charged through the cable (2), and after the energy storage capacitor is fully charged, the underground jar (5) is controlled to generate an upward jar force through the jar controller (1) to complete one-time jar.

13. A method of use of a downhole jarring stuck freeing apparatus as claimed in claim 12 wherein after completion of the first jar, fluid is injected into the well through the tubular string (3) to push the jar block (5.5) back into the initial position in preparation for a second jar and so forth cyclically until fish fall free.

Technical Field

The invention relates to the field of underground pipe column unfreezing operation in an oil field horizontal well, in particular to an underground jarring unfreezing device and a using method thereof.

Background

When a downhole tubular column such as a sand control tubular column or a drilling tubular column in a horizontal well meets a blockage, if the blockage is released by lifting or reversing at a well head, the action force of the well head is difficult to transfer to the downhole to cause the blockage release failure, so that the blockage release is usually realized by adopting downhole hydraulic boosting or jarring.

For the blockage removal of the sand control pipe column in the pipe, the underground hydraulic boosting blockage removal effect is good, but the pipe column needs to be anchored on the inner wall of the casing pipe, and certain damage is caused to the inner wall of the casing pipe;

and for the unfreezing of the drilling string, the underground hydraulic boosting process is not suitable because the underground hydraulic boosting process cannot be anchored on the open hole well wall. The shock stuck releasing process does not need anchoring, generates larger stuck releasing force by means of shock, and is a more ideal stuck releasing mode.

At present, the jarring stuck-freeing process mainly comprises two forms of mechanical jarring and hydraulic jarring:

mechanical jarring relies on lifting the tubular column energy storage, forms the jarring after the energy releases in the twinkling of an eye, mainly uses in the straight well, and in complicated structure wells such as inclined shaft, horizontal well, because the influence of well bore orbit, tubular column energy loss is great, and the jarring effect is not good. Such as:

the patent numbers are: CN201420632671.5, published 2015-03-25 discloses a novel sealed full-hydraulic drilling jar, relating to the field of unfreezing of drilling strings. A novel sealed full-hydraulic drilling jar comprises an outer cylinder and an inner shaft arranged in the outer cylinder, wherein the outer cylinder comprises a locking cylinder, a spline outer cylinder, an upper valve cylinder, a lower valve cylinder, a hydraulic cylinder and a joint which are sequentially connected; the inner shaft comprises a spline shaft, a valve core shaft and a piston which are connected in sequence, and the valve core shaft is arranged in an upper valve cylinder, a lower valve cylinder and a hydraulic cylinder which are connected in sequence. The jar further comprising: the first valve body is arranged between the valve core shaft and the outer cylinder and is sleeved on the valve core shaft; the top of the first meter valve body is provided with a sealing surface which is used for matching with the outer cylinder to form linear sealing when the first meter valve body is struck; the second meter valve body is arranged between the valve core shaft and the outer cylinder, sleeved on the valve core shaft and positioned at the lower end of the first meter valve body; the bottom of the second meter valve body is provided with a sealing surface which is used for matching with the outer cylinder to form linear sealing when the second meter valve body is knocked down. When the valve core shaft is impacted upwards, the drill string needs to be lifted upwards, under the double action of hydraulic oil and the valve core shaft, the first metering valve moves upwards, the circular arc-shaped line sealing surface of the first metering valve is contacted with the first conical surface sealing seat on the inner wall surface of the upper valve barrel to form line sealing, at the moment, the first step of the valve core shaft and the first metering valve are in slight interference fit, pressure required for sealing the first metering valve can be generated, sealing can be generated to prevent oil from leaking from the valve core shaft, hydraulic oil can only be slowly drained through an overflow hole in the first metering valve, so that high pressure is formed in the lower valve barrel and the hydraulic cylinder, and energy storage of the drill string; when the first step of the valve core shaft passes through the first metering valve again, the arc-shaped line sealing surface of the first metering valve body is separated from the first conical surface sealing seat, pressure-out oil is suddenly unloaded, the stored energy of the drill string is released, and upward shock is generated.

The hydraulic jarring relies on the hydraulic pressure in the pit pressure force compression spring energy storage, and the jarring power of production is relatively less, and the unfreezing ability is limited, for example:

the patent numbers are: CN201721443531.3, published 2018-06-01 discloses a new hydraulic jar, relating to the field of oil field underground salvage. The hydraulic jar includes: the upper joint, the outer cylinder and the lower joint are communicated from top to bottom in sequence; the outer cylinder includes: the small-diameter inner cavity section and the large-diameter inner cavity section are communicated up and down; the upper and lower jarring bodies are axially slidably sleeved in the outer barrel, and the upper end of the upper jar body and the lower end of the lower jar body are respectively used for jarring the upper joint and the lower joint; the sealing element is sleeved on the lower shock body and used for dynamically sealing an annular gap between the lower shock body and the small-diameter inner cavity section, and the outer diameter of the sealing element is smaller than the inner diameter of the large-diameter inner cavity section; the upper elastic piece is arranged in a pressure applying cavity formed by the upper shock body and the small-diameter inner cavity section, and the upper end and the lower end of the upper elastic piece are respectively abutted against the upper joint and the lower shock body; the lower elastic part is arranged in a pressure relief cavity formed by the lower jarring body and the outer cylinder body, and the upper end and the lower end of the lower elastic part are respectively abutted against the lower jarring body and the lower joint; the wall of the large-diameter inner cavity section is provided with a pressure relief hole communicated with the pressure relief cavity. When the fishing tool or the fish is blocked, the pipe column is not easy to lift, at the moment, working fluid (such as water) is pumped into the pipe column, and enters the upper part of the upper shock body and a pressure applying cavity formed between the upper shock body and the small-diameter inner cavity section. Because the sealing element seals the annular gap between the lower impact body and the small-diameter inner cavity section in a dynamic manner, the working liquid in the pressure applying cavity cannot flow into the pressure releasing cavity. The working liquid gathered above the upper shock body and in the pressure applying cavity drives the upper shock body, the lower shock body and the sealing element to slide downwards. After the sealing element enters the large-diameter inner cavity section, the outer diameter of the sealing element is smaller than the inner diameter of the large-diameter inner cavity section, the sealing element cannot seal an annular gap between the lower impact body and the large-diameter inner cavity section in a movable mode, the pressure applying cavity is communicated with the pressure releasing cavity, and therefore working liquid enters the pressure releasing cavity from the pressure applying cavity and flows out from the pressure releasing hole. Meanwhile, the lower impact body slides downwards to compress the lower elastic part and impact the lower joint, then the lower elastic part recovers and gives upward driving force to the lower impact body, and the lower impact body drives the upper impact body and the sealing part to slide upwards. Until go up the upward sliding compression of jarring body elastic component to jar upper joint, then go up the elastic component reconversion and give upward jar driving force that the body is downward, go up jar body and drive down jar body, sealing member and slide downwards. Until the lower impact body slides downwards to compress the lower elastic part and impact the lower joint, then the lower elastic part recovers the original state to drive the lower impact body, the upper impact body and the sealing part to slide upwards. Repeating the above process, the upper and lower jarring bodies reciprocate up and down, and the upper and lower joints are jarred for many times to realize releasing the jam.

In addition, in the field of unfreezing of logging operations, an electric jar is provided, hydraulic oil or a lead screw compression spring is driven by a motor to store energy, the generated jar force is smaller, and the electric jar is suitable for unfreezing of logging instruments and is not suitable for unfreezing operations of large-scale tubular columns such as underground sand control tubular columns or drilling tubular columns. Therefore, a jar capable of generating a large jarring force in the underground is needed to meet the jam release operation requirements of large-scale tubular columns such as sand control tubular columns or drilling tubular columns in horizontal wells.

Disclosure of Invention

Aiming at the problems that mechanical shock is not suitable for wells with complex structures and spring energy storage shock force of hydraulic or electric jars is small, the invention provides the underground shock stuck releasing device and the using method thereof, which solve the stuck releasing problem of large-scale pipe columns such as sand control pipe columns or drilling pipe columns in horizontal wells and reduce production cost.

The technical solution of the invention is as follows:

the underground jarring stuck-releasing device comprises a jar controller and an underground jar, wherein the jar controller is connected with the underground jar through a cable; the underground jar is provided with an inner cylinder and an outer cylinder, two ends of the outer cylinder are respectively connected with an upper joint of the jar and a lower joint of the jar, a partition table is arranged in an inner cavity of the outer cylinder, the inner cylinder is arranged in an inner cavity above the partition table, and an energy storage capacitor is arranged in an inner cavity below the partition table; the inner cylinder is internally provided with a shock block externally wound with an induction coil, and a driving coil is fixed outside the shock block, the energy storage capacitor is connected with a shock controller on the ground through a cable, the driving coil is connected with the energy storage capacitor through a lead, and the energy storage capacitor is provided with a liquid flow hole.

The energy storage capacitor is at least provided with one stage, the energy storage capacitor is respectively a primary energy storage capacitor and a secondary energy storage capacitor, the primary energy storage capacitor and the secondary energy storage capacitor are connected with the cable in parallel, and the liquid flow holes of the primary energy storage capacitor and the secondary energy storage capacitor are communicated with the center hole of the middle partition table in the inner cavity of the outer barrel, the center hole of the inner barrel and the center holes of the upper joint and the lower joint of the jar knocker.

The number of the drive coils is equal to that of the energy storage capacitors, and the drive coils are respectively a primary drive coil and a secondary drive coil which are respectively connected with the primary energy storage capacitor and the secondary energy storage capacitor through leads.

The middle part of the shock block is small in outer diameter, two ends of the shock block are hammer-shaped, and the induction coil is wound on the middle part of the outer wall of the shock block.

The lower part of the inner cavity of the inner cylinder is provided with a shock block seat, the shock block seat is provided with a central hole, and the upper end of the central hole is provided with a chamfer which is matched with the lower part of the shock block.

The distance from the shock block seat to the top of the inner cylinder is set to be 3-5 m; the primary drive coil and the secondary drive coil are respectively fixed at the lower part and the middle part of the outer wall of the inner cylinder and positioned at two sides of the shock block.

Cable through holes are formed in the lower body of the upper connector of the jar and the partition in the outer cylinder, and the cables penetrate through the lower well pipe column, the upper connector of the jar and the outer cylinder and are connected with the primary energy storage capacitor and the secondary energy storage capacitor; a cable through hole in the upper connector of the jar is obliquely arranged at the lower part of the upper connector body of the jar, so that an outlet of the cable through hole is tightly attached to the inner wall of the outer barrel; the cable through hole in the outer cylinder partition is tightly attached to the inner wall of the outer cylinder.

The downhole string is coiled tubing.

The jar controller is internally provided with a control chip and at least provided with two power interfaces, and a cable is connected with the control chip; the jar controller can be connected with an external power supply and charges the energy storage capacitor through a cable.

The shock absorber is further connected between the downhole tubular column and the downhole jar, the shock absorber is provided with a shock absorber upper joint, a shock absorption spring and a shock absorber lower joint, a shock absorption partition table is arranged in an inner cavity of the shock absorber upper joint, a center hole is formed in the shock absorber lower joint, the upper end portion of the shock absorber lower joint is hung on the shock absorption partition table, and the shock absorption spring is installed between the lower body of the shock absorption partition table below and the shock absorber lower joint.

An inner cavity at the upper part of the upper joint of the shock absorber is provided with an internal thread to be connected with a downhole tubular column, and an external thread is arranged on the excircle at the lower part of the lower joint of the shock absorber to be connected with the upper joint of the shock absorber; the height of the inner cavity above the shock absorption partition table in the shock absorber upper joint is larger than the height of the shock absorption spring when the shock absorption spring is not compressed.

A using method of an underground jarring stuck-releasing device comprises the following steps:

A. the underground jarring jam releasing device is inspected and assembled on the ground, and the lower end of a jar lower connector of the underground jar is connected with a fishing tool;

B. the underground jarring unfreezing device is lowered to the top of the fish through a downhole tubular column, and the fish is fished up through a fishing tool;

C. the method comprises the following steps that a jar controller is connected with an external power supply, an energy storage capacitor is charged through a cable, and after the energy storage capacitor is fully charged, the jar controller controls an underground jar to generate an upward jar force to finish a jar;

after the primary shock is finished, injecting liquid into the well through the well descending pipe column, pushing the shock block to return to the initial position, preparing for secondary shock, and repeating the steps until fish falls and is unfrozen.

Compared with the existing underground jarring stuck-releasing device, the underground jarring stuck-releasing device has the remarkable using effect that the driving coil and the induction coil are arranged in the underground jarring stuck-releasing device according to the electromagnetic induction principle, and the induction coil is wound outside the jarring block. The underground jar of the invention utilizes the energy storage capacitor to store energy, converts the electric energy into the kinetic energy of the jar block by the electromagnetic induction principle, can carry out multi-stage acceleration, and leads the jar block to generate larger kinetic energy, thereby being capable of generating stronger jar force. Compared with spring energy storage of a hydraulic jar, the jar shocking force is larger, and the unfreezing effect is better. Compared with a mechanical jar utilizing a lifting pipe column for energy storage, the vertical pipe column unfreezing device is more suitable for underground pipe column unfreezing operation in a horizontal well.

In addition, in order to protect the downhole tubular column, a shock absorber is connected between the downhole tubular column and the jar, so that the downhole tubular column above the device can be effectively protected, and the damage of the jar unfreezing operation to the downhole tubular column is avoided.

In addition, the invention utilizes the mode of positive circulation well fluid to reset the shock block which is shot, has simple operation and convenient construction, and is also beneficial to the unfreezing operation of fish falling from the lower part.

In conclusion, the pipe column releasing device is suitable for releasing the stuck pipe column in the well, is particularly suitable for releasing the stuck pipe column of the sand control pipe column and the drilling pipe column in the horizontal well, can generate obvious using effect, improves the releasing construction efficiency and the releasing success rate, and has good application prospect.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the structure of the shock absorber of the present invention.

Fig. 3 is a schematic view of the construction of the jar of the present invention.

Detailed Description

The present invention is described in detail below with reference to the accompanying drawings, and the detailed description and technical contents of the present invention are described below with reference to the accompanying drawings, however, the drawings are only for reference and illustration, and are not used to limit the protection scope of the present invention. The following description is only a preferred embodiment of the present invention, and other equivalent variations applying the present invention should fall within the protection scope of the present invention.

Referring to fig. 1 to 3, a downhole jar stuck freeing device includes a jar controller 1 and a downhole jar 5, the jar controller 1 being connected to the downhole jar 5 by a cable 2; the underground jar 5 is provided with an inner cylinder 5.3 and an outer cylinder 5.2, two ends of the outer cylinder 5.2 are respectively connected with an upper joint 5.1 and a lower joint 5.10 of the jar, a partition table is arranged in an inner cavity of the outer cylinder 5.2, the inner cylinder 5.3 is arranged in an inner cavity above the partition table, and an energy storage capacitor is arranged in an inner cavity below the partition table; the inner cylinder 5.3 is internally provided with a shock block 5.5 externally wound with an induction coil 5.6, and a driving coil is fixed outside the shock block, the energy storage capacitor is connected with a shock controller 1 positioned on the ground through a cable 2, the driving coil is connected with the energy storage capacitor through a lead, and the energy storage capacitor is provided with a liquid flow hole.

On the basis of the first embodiment, the invention also has the following embodiments:

example two

The energy storage capacitor sets up the one-level at least, the energy storage capacitor be one-level energy storage capacitor 5.8 and second grade energy storage capacitor 5.9 respectively, one-level energy storage capacitor 5.8 and second grade energy storage capacitor 5.9 are parallelly connected with cable 2, the liquid flow hole of one-level energy storage capacitor 5.8 and second grade energy storage capacitor 5.9 is linked together with the centre bore of the middle partition of urceolus 5.2 inner chamber, the centre bore of inner tube 5.3 and the centre bore of jar ware top connection 5.1 and jar ware lower clutch 5.10, allows well liquid to pass through.

EXAMPLE III

The number of the drive coils is equal to that of the energy storage capacitors, namely a primary drive coil 5.7 and a secondary drive coil 5.4, and the primary drive coil 5.7 and the secondary drive coil 5.4 are respectively connected with a primary energy storage capacitor 5.8 and a secondary energy storage capacitor 5.9 through leads.

Example four

The middle part of the shock block 5.5 is small in outer diameter, two ends of the shock block are hammer-shaped, and the induction coil 5.6 is wound on the middle part of the outer wall of the shock block 5.5.

EXAMPLE five

The lower part of the inner cavity of the inner cylinder 5.3 is a shock block seat, the shock block seat is provided with a central hole, and the upper end of the central hole is provided with a chamfer which is matched with the lower part of the shock block 5.5.

The distance from the shock block seat to the top of the inner cylinder 5.3 is set to be 3 m-5 m, so that the shock block 5.5 can generate enough shock force; the primary driving coil 5.7 and the secondary driving coil 5.4 are respectively fixed at the lower part and the middle part of the outer wall of the inner cylinder 5.3 and positioned at two sides of the shock block 5.5.

EXAMPLE six

Cable through holes are formed in the lower body of the upper connector 5.1 of the jar and the partition in the outer cylinder 5.2, and the cable 2 penetrates through the lower well pipe column 3, the upper connector 5.1 of the jar and the outer cylinder 5.2 to be connected with a primary energy storage capacitor 5.8 and a secondary energy storage capacitor 5.9; a cable through hole in the upper connector 5.1 of the jar is obliquely arranged at the lower part of the body of the upper connector 5.1 of the jar, so that an outlet of the cable through hole is tightly attached to the inner wall of the outer cylinder 5.2; the cable through hole in the outer cylinder 5.2 partition is tightly attached to the inner wall of the outer cylinder 5.2, so that the cable 2 passing through the cable through hole can be attached to the inner wall of the outer cylinder 5.2.

EXAMPLE seven

The tubular string 3 is coiled tubing.

Example eight

The jar controller 1 is internally provided with a control chip and at least provided with two power interfaces, and the cable 2 is connected with the control chip; the jar controller 1 can be connected with an external power supply and charges the energy storage capacitor through the cable 2.

Under the control of the jar controller 1 located on the ground, the primary energy storage capacitor 5.8 discharges to the primary driving coil 5.7, the induction coil 5.6 on the jar block 5.5 generates induction current, the induction current is in a magnetic field generated by the primary driving coil 5.7, the induction coil 5.6 is acted by ampere force to drive the jar block 5.5 to move upwards, when the jar block 5.5 moves to the upper end of the secondary driving coil 5.4, the jar controller 1 controls the secondary energy storage capacitor 5.9 to discharge, based on the same principle, the secondary driving coil 5.4 continuously pushes the jar block 5.5 to move upwards, the jar block 5.5 continuously accelerates, and finally impacts the lower end part of the jar upper joint 5.1 of the underground jar 5 to form a jar.

Example nine

Still being connected bumper shock absorber 4 between tubular column 3 and the bumper shock absorber 5 in the pit, bumper shock absorber 4 is equipped with bumper shock absorber top connection 4.1, damping spring 4.2 and bumper shock absorber lower clutch 4.3, and bumper shock absorber top connection 4.1's inner chamber is equipped with the shock attenuation and separates the platform, bumper shock absorber lower clutch 4.3 be equipped with the centre bore, the upper end tip hangs the shock attenuation separate the bench face, damping spring 4.2 installs and separates between platform below and bumper shock absorber lower clutch 4.3's lower part body. The shock absorber 4 is arranged between the downhole tubular column 3 and the downhole jar 5, so that the downhole tubular column above the device can be protected, and the damage to the downhole tubular column caused by the unfreezing of the jar can be avoided.

An inner cavity at the upper part of the upper joint 4.1 of the shock absorber is provided with an internal thread to be connected with the lower well pipe column 3, and an external thread is arranged on the excircle at the lower part of the lower joint 4.3 of the shock absorber to be connected with the upper joint 5.1 of the shock absorber; the height of the inner cavity above the shock absorbing partition in the shock absorber upper joint 4.1 is larger than the height of the shock absorbing spring 4.2 when the shock absorbing spring is not compressed.

When the shock absorber 4 receives upward impact force, the impact force is transmitted to the shock absorbing spring 4.2 from the lower shock absorber joint 4.3 and then transmitted to the upper shock absorber joint 4.1 from the shock absorbing spring 4.2, and due to the shock absorbing effect of the shock absorbing spring 4.2, the impact force received by the upper shock absorber joint 4.1 is greatly reduced.

A using method of an underground jarring stuck-releasing device comprises the following steps:

A. inspecting and assembling the underground jarring jam release device on the ground, and connecting the lower end of a jar lower connector 5.10 of the underground jar 5 with a fishing tool;

B. the underground jarring unfreezing device is lowered to the top of the fish through a downhole tubular column, and the fish is fished up through a fishing tool;

C. the method comprises the following steps that a jar controller 1 is connected with an external power supply, an energy storage capacitor is charged through a cable 2, and after the energy storage capacitor is fully charged, a downhole jar 5 is controlled to generate an upward jar force through the jar controller 1 to finish a jar; in the process, the underground jar 5 drives the fishing tool to move upwards and upwards to fish, and the shock absorber 4 can effectively reduce the impact of the shock force on the upper underground pipe column to avoid damaging the upper underground pipe column.

After the primary jarring is completed, liquid is injected into the well through the well descending pipe column 3, the jar block 5.5 is pushed to return to the initial position to prepare for secondary jarring, and the process is circulated until fish falls and is unfreezed.

According to the embodiment, the underground jar 5 stores energy by using the capacitor, electric energy is converted into kinetic energy of the jar block 5.5 by the electromagnetic induction principle, multi-stage acceleration can be performed, the jar block 5.5 generates larger kinetic energy, and accordingly larger jar force is generated. Compared with a mechanical jar utilizing a lifting pipe column for energy storage, the vertical pipe column unfreezing device is more suitable for underground pipe column unfreezing operation in a horizontal well. The invention generates the shock force according to the electromagnetic induction principle, is not influenced by the well body structure, is suitable for the stuck releasing operation of the underground pipe column, and is particularly suitable for the stuck releasing operation of the sand control pipe column and the drilling pipe column in the horizontal well. Wide application range, large shock force, good jam release effect and wide application prospect.

The embodiments described above are merely exemplary embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and teaching of the present invention. Many variations, combinations, and modifications of the aspects disclosed herein are possible and are within the scope of the invention, which is, therefore, not to be limited by the above description.