阅读说明：本技术 一种井下连续向下震击解卡装置及方法 (Underground continuous downward-jarring stuck freeing device and method ) 是由 金锋 张佳 王凌 郑波强 黄保黔 万文财 王文 张腾飞 张泽丽 郑廷碧 于 2020-12-29 设计创作，主要内容包括：本发明公开了一种井下连续向下震击解卡装置及方法,该装置包括外筒部分和心轴部分,所述外筒部分包括从上至下依次螺纹连接在一起的上接头、上套筒、上连接体、中间套筒、下连接体以及花键套；所述心轴部分包括螺纹连接在上接头内孔上的分流帽以及贯穿在上套筒和上连接体中的阀杆,在分流帽的中心开设有盲孔,在盲孔的侧壁上开设有分流孔,所述的阀杆从上至下外径逐渐缩小的为台阶轴结构,在阀杆的大轴上端固定安装有上部扶正套。本发明能有效提高解卡成功率,为油田提供了可靠的解卡工具；而且本发明克服了不同排量下需要进行频率匹配才能产生有效震击的问题,可以在任意排量下均可以产生连续震击。(The invention discloses a device and a method for releasing a stuck by continuously downward jarring in a well, wherein the device comprises an outer cylinder part and a mandrel part, wherein the outer cylinder part comprises an upper joint, an upper sleeve, an upper connector, a middle sleeve, a lower connector and a spline housing which are sequentially connected together by threads from top to bottom; the spindle part comprises a shunting cap in threaded connection with an inner hole of the upper joint and a valve rod penetrating through the upper sleeve and the upper connecting body, a blind hole is formed in the center of the shunting cap, shunting holes are formed in the side wall of the blind hole, the valve rod is of a step shaft structure with gradually reduced outer diameter from top to bottom, and an upper centering sleeve is fixedly mounted at the upper end of a large shaft of the valve rod. The invention can effectively improve the success rate of unfreezing and provides a reliable unfreezing tool for the oil field; the invention overcomes the problem that effective jarring can be generated only by frequency matching under different discharge capacities, and continuous jarring can be generated under any discharge capacity.)

1. A downhole continuous downward jarring stuck freeing device comprising an outer barrel portion and a mandrel portion, characterized in that: the outer barrel part comprises an upper joint (1), an upper sleeve (7), an upper connector (9), a middle sleeve (10), a lower connector (14) and a spline housing (15) which are sequentially connected together through threads from top to bottom; the central spindle part comprises a shunting cap (2) which is in threaded connection with an inner hole of an upper joint (1) and a valve rod (3) which penetrates through an upper sleeve (7) and an upper connector (9), a blind hole is formed in the center of the shunting cap (2), shunting holes are formed in the side wall of the blind hole, the valve rod (3) is of a stepped spindle structure with the outer diameter gradually reduced from top to bottom, an upper centering sleeve (4) is fixedly arranged at the upper end of a large spindle of the valve rod (3), a middle centering sleeve (8) is sleeved in the middle of the large spindle of the valve rod (3), the middle centering sleeve (8) is limited by the end part of the upper connector (9), a spring (5) is arranged between the upper centering sleeve (4) and the middle centering sleeve (8), a valve seat (12) is in sliding connection with the inner hole of the middle sleeve (10), a slip (11) is in threaded connection with the upper end of the valve seat (12), and a limiting boss (23) is arranged, the lower end of the valve seat (12) is in threaded connection with a piston rod (17), the piston rod (17) penetrates through the middle sleeve (10) and the lower connecting body (14) and is in sliding fit with an inner hole of the lower connecting body (14), the upper portion of the piston rod (17) is in threaded connection with a limiting ring (13), and an overflowing hole is formed in the side wall of the middle sleeve (10) and between the lower end of the limiting ring (13) and the upper end of the lower connecting body (14).

2. The downhole continuous downward jarring stuck freeing device of claim 1, wherein: the springs (5) are arranged in pairs, and a gasket (6) is arranged between the two springs (5).

3. The downhole continuous downward jarring stuck freeing device of claim 1, wherein: the upper end of the slip (11) is matched with the lower end of the upper connecting body (9) through a conical surface.

4. The downhole continuous downward jarring stuck freeing device of claim 1, wherein: the outer wall of the valve seat (12) is sleeved with a sand scraping ring (19) and two Gray rings (20).

5. The downhole continuous downward jarring stuck freeing device of claim 1, wherein: the joint of the valve seat (12) and the piston rod (17) is in threaded connection with a locking screw (21).

6. The downhole continuous downward jarring stuck freeing device of claim 1, wherein: a set of semicircular through grooves are formed in the inner wall of the spline sleeve (15), semicircular grooves corresponding to the semicircular through grooves are formed in the outer wall of the piston rod (17), a set of steel balls (16) are arranged between the semicircular through grooves and the semicircular grooves, an oil plugging hole for injecting oil is formed in the side wall of the spline sleeve (15), and an oil plug (22) is in threaded connection with the oil plugging hole.

7. A downhole continuous downward jarring stuck freeing method based on the downhole continuous downward jarring stuck freeing device as claimed in any one of claims 1-6, characterized in that: the mud circulating pressure is led in from the upper joint and then is sprayed out from the shunting holes on the shunting cap, so that the valve rod is pushed to move downwards, the spring is compressed, the lower end of the valve rod is contacted with the upper end surface of the valve seat, at the moment, the valve rod moves downwards together with the piston rod connected to the lower end of the valve seat, when the internal pressure of the tool is continuously increased, the piston rod and a lower drilling tool connected to the lower end of the piston rod are relatively fixed and fixed, when the internal pressure of the tool is continuously increased, an upper pipe column connected to the upper joint and the spline housing move upwards relatively, namely, the lower end surface of the lower end of the spline housing is separated from a shoulder on the piston rod, at the moment, the inner conical surface of the slip; because of the limit ring, the upper pipe column can not continuously rise after moving for a certain distance, at the moment, the spring rebounds rapidly to enable the valve rod and the valve seat to be rapidly separated, the slip continues to fall back, the internal circulation pressure of the tool is established, at the moment, the upper pipe column rapidly moves downwards under the action of self hanging weight and elastic deformation, because of the circulation pressure in the tool, the valve rod is pushed again and the spring is compressed, the lower end of the valve rod is enabled to be contacted with the upper end face of the valve seat again, because the inner hole of the slip is provided with the limit boss, the valve rod acts on the limit boss of the inner hole of the slip, the contact between the valve rod and the upper end face of the valve seat is delayed, at the moment, the internal circulation pressure of the tool still exists, the lower end face of the lower end of; after the downward shock happens, the inner conical surface of the slip is attached to the outer conical surface of the upper connecting body, the slip returns to the initial state under the action of the upper connecting body, the lower end of the valve rod is contacted with the upper end surface of the valve seat again under the action of the mud circulating pressure, and the whole tool moves repeatedly again, so that the purpose of continuous shock is achieved.

Technical Field

The invention relates to a device and a method for releasing downhole continuous downward jarring, and belongs to the technical field of oilfield downhole tools.

Background

The jar is separated and is stuck the instrument that the drilling accident was stuck in the prevention and processing in the oil gas exploration exploitation in-process, and the weak point of current jar is separated and is stuck the instrument and mainly lie in: 1. the inability to produce continuous jarring; 2. the jarring tonnage is unstable; 3. when different well conditions meet the stuck drill, the shock mode can not achieve the purpose of releasing the stuck drill by vibration; 4. the effect of the different displacements on the downward blow is greater.

Disclosure of Invention

The invention aims to provide a device and a method for releasing the underground continuous downward shock which have reliable performance and simple and convenient operation and can generate continuous shock, so as to overcome the defects in the prior art.

The technical scheme of the invention is as follows: a continuous downward jarring unfreezing device in a well comprises an outer cylinder part and a mandrel part, wherein the outer cylinder part comprises an upper joint, an upper sleeve, an upper connector, a middle sleeve, a lower connector and a spline housing which are sequentially connected together in a threaded manner from top to bottom; the central spindle part comprises a shunting cap which is connected with an inner hole of the upper connector in a threaded manner and a valve rod which penetrates through the upper sleeve and the upper connector, a blind hole is arranged at the center of the shunting cap, a shunting hole is arranged on the side wall of the blind hole, the outer diameter of the valve rod gradually decreases from top to bottom to form a step spindle structure, an upper centering sleeve is fixedly arranged at the upper end of a main spindle of the valve rod, a middle centering sleeve is sleeved at the middle part of the main spindle of the valve rod and is limited by the end part of the upper connector, a spring is arranged between the upper centering sleeve and the middle centering sleeve, a valve seat is connected in the inner hole of the middle sleeve in a sliding manner, a slip is connected at the upper end of the valve seat in a threaded manner, a limiting boss is arranged in the inner hole of the slip, a piston rod is connected at the lower end of the valve, the upper part of the piston rod is in threaded connection with a limiting ring, and an overflowing hole is formed in the side wall of the middle sleeve and located between the lower end of the limiting ring and the upper end of the lower connecting body.

Further, the springs are arranged in pairs with a washer disposed between the two springs.

Furthermore, the upper end of the slip is matched with the lower end of the upper connecting body through a conical surface.

Furthermore, the outer wall of the valve seat is sleeved with a sand scraping ring and two Glare rings.

Further, the joint of the valve seat and the piston rod is in threaded connection with a locking screw.

Furthermore, a set of semicircular through grooves are formed in the inner wall of the spline sleeve, semicircular grooves corresponding to the semicircular through grooves are formed in the outer wall of the piston rod, a set of steel balls are arranged between the semicircular through grooves and the semicircular grooves, an oil plugging hole for injecting oil is formed in the side wall of the spline sleeve, and the oil plugging hole is in threaded connection with an oil plug.

Meanwhile, the invention also provides a downhole continuous downward jarring stuck freeing method based on the downhole continuous downward jarring stuck freeing device, slurry circulating pressure is led in from an upper connector and then is sprayed out from a shunting hole on a shunting cap, thereby pushing the valve rod to move downwards and compressing the spring to make the lower end of the valve rod contact with the upper end surface of the valve seat, at the moment, the valve rod moves downwards together with the piston rod connected with the lower end of the valve seat, when the internal pressure of the tool is continuously increased, the piston rod and the lower drilling tool connected to the lower end of the piston rod are relatively fixed, and when the internal pressure of the tool is continuously increased, the upper pipe column connected to the upper joint and the spline sleeve relatively move upwards together, namely, the lower end surface of the lower end of the spline sleeve is separated from the shoulder on the piston rod, the inner conical surface of the slip is separated from the outer conical surface of the upper connector, and the limiting boss on the slip falls back on the outer circle of the step of the valve rod; because of the limit ring, the upper pipe column can not continuously rise after moving for a certain distance, at the moment, the spring rebounds rapidly to enable the valve rod and the valve seat to be rapidly separated, the slip continues to fall back, the internal circulation pressure of the tool is established, at the moment, the upper pipe column rapidly moves downwards under the action of self hanging weight and elastic deformation, because of the circulation pressure in the tool, the valve rod is pushed again and the spring is compressed, the lower end of the valve rod is enabled to be contacted with the upper end face of the valve seat again, because the inner hole of the slip is provided with the limit boss, the valve rod acts on the limit boss of the inner hole of the slip, the contact between the valve rod and the upper end face of the valve seat is delayed, at the moment, the internal circulation pressure of the tool still exists, the lower end face of the lower end of; after the downward shock happens, the inner conical surface of the slip is attached to the outer conical surface of the upper connecting body, the slip returns to the initial state under the action of the upper connecting body, the lower end of the valve rod is contacted with the upper end surface of the valve seat again under the action of the mud circulating pressure, and the whole tool moves repeatedly again, so that the purpose of continuous shock is achieved.

Due to the adoption of the technical scheme, the invention has the advantages that:

1. the invention can effectively improve the success rate of unfreezing and provides a reliable unfreezing tool for the oil field;

2. the invention overcomes the problem that effective jarring can be generated only by frequency matching under different discharge capacities, and continuous jarring can be generated under any discharge capacity;

3. the invention relates to a continuous downward jarring jam releasing tool, which belongs to a salvaging jam releasing tool, has reliable working performance and simple and convenient operation, can be suitable for various underground operations such as well repair, salvaging and the like, and can be widely used in various domestic oil fields.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the slips;

fig. 3 is a cross-sectional view C-C of fig. 2.

Description of reference numerals: 1-upper joint, 2-flow dividing cap, 3-valve rod, 4-upper centering sleeve, 5-spring, 6-gasket, 7-upper sleeve, 8-middle centering sleeve, 9-upper connector, 10-middle sleeve, 11-slip, 12-valve seat, 13-limiting ring, 14-lower connector, 15-spline sleeve, 16-steel ball, 17-piston rod, 18-O-shaped ring, 19-sand scraping ring, 20-Glare ring, 21-anti-loose screw, 22-oil plug and 23-limiting boss.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.

The embodiment of the invention comprises the following steps: the structure schematic diagram of the underground continuous downward jarring jam releasing device is shown in figures 1-3, and comprises an outer cylinder part and a mandrel part, wherein the outer cylinder part comprises an upper joint 1, an upper sleeve 7, an upper connecting body 9, a middle sleeve 10, a lower connecting body 14 and a spline sleeve 15 which are sequentially connected together through threads from top to bottom; the central spindle part comprises a shunting cap 2 which is connected with an inner hole of an upper joint 1 in a threaded manner and a valve rod 3 which penetrates through an upper sleeve 7 and an upper connecting body 9, a blind hole is arranged at the center of the shunting cap 2, shunting holes are arranged on the side wall of the blind hole, the outer diameter of the valve rod 3 gradually decreases from top to bottom to form a stepped spindle structure, an upper centering sleeve 4 is fixedly arranged at the upper end of a large shaft of the valve rod 3, a middle centering sleeve 8 is sleeved at the middle part of the large shaft of the valve rod 3, the middle centering sleeve 8 is limited by the end part of the upper connecting body 9, a spring 5 is arranged between the upper centering sleeve 4 and the middle centering sleeve 8, a valve seat 12 is connected in a sliding manner in the inner hole of an intermediate sleeve 10, a slip 11 is connected with the upper end thread of the valve seat 12, a limiting boss 23 is arranged in the inner hole of the slip 11, a piston rod 17 is connected with the lower end thread of the valve seat 12, a limit ring 13 is connected to the upper portion of the piston rod 17 through a thread, an overflow hole is formed in the sidewall of the intermediate sleeve 10 between the lower end of the limit ring 13 and the upper end of the lower connecting body 14, and a distance between the lower end of the limit ring 13 and the upper end of the lower connecting body 14 is denoted by L in fig. 1. The springs 5 are arranged in pairs, with a washer 6 being arranged between the two springs 5. The upper end of the slip 11 is matched with the lower end of the upper connecting body 9 through a conical surface. The outer wall of the valve seat 12 is sleeved with a sand scraping ring 19 and two GREEN rings 20. The connecting part of the valve seat 12 and the piston rod 17 is in threaded connection with a locking screw 21, so that the valve seat 12 and the piston rod 17 are prevented from loosening. The inner wall of the spline sleeve 15 is provided with a group of semicircular through grooves, the outer wall of the piston rod 17 is provided with semicircular grooves corresponding to the semicircular through grooves, a group of steel balls 16 are arranged between the semicircular through grooves and the semicircular grooves, the side wall of the spline sleeve 15 is provided with an oil plugging hole for injecting hydraulic oil or lubricating steel balls 16, and the oil plugging hole is in threaded connection with an oil plug 22. The threaded connections of the various components are fitted with O-rings 18 to improve the seal of the overall tool.

The working principle of the invention is as follows:

the invention introduces the slurry circulation pressure from the upper joint 1, and then is sprayed out from the shunting hole on the shunting cap 2, and then push the valve stem 3 to descend, and compress the spring 5, make the lower end of the valve stem 3 contact with upper end face A of the valve base 12, the valve stem 3 moves down together with piston rod 17 connected to lower end of the valve base 12 at this moment, when the internal pressure of the tool is continuously increased, the piston rod 17 and the lower drilling tool connected to lower end of the piston rod 17 are relatively fixed and motionless, when the internal pressure of the tool is continuously increased, the upper pipe column connected to the upper joint 1 and the spline housing 15 move relatively upwards together, namely the lower end face B of the lower end of the spline housing 15 is separated from the shoulder on the piston rod 17, the internal conical surface of the slips 11 and the external conical surface of the upper connector 9 are separated from each. Because of the limit ring 13, the upper pipe column can not continuously rise after moving for a distance L, at the moment, the spring 5 rapidly rebounds to rapidly separate the valve rod 3 from the valve seat 12, the slip 11 continuously falls back, the internal circulation pressure of the tool is established, at the moment, the upper pipe column rapidly moves downwards under the action of self-hanging weight and elastic deformation, due to the circulating pressure in the tool, the valve rod 3 is pushed again and the spring 5 is compressed, so that the lower end of the valve rod 3 is contacted with the upper end surface A of the valve seat 12 again, because the inner hole of the slip 11 is provided with the limiting boss 23, the valve rod 3 acts on the limiting boss 23 of the inner hole of the slip 11 at the moment, the valve rod 3 is prevented from contacting with the upper end surface A of the valve seat 12, the internal circulation pressure of the tool still exists at the moment, so that the lower end surface B of the lower end of the spline housing 15 comes into contact with the shoulder on the piston rod 17, at which time a downward blow is generated. After the downward shock happens, the inner conical surface of the slip 11 is attached to the outer conical surface of the upper connecting body 9, the slip 11 is restored to the initial state under the action of the upper connecting body 9, the lower end of the valve rod 3 is contacted with the upper end surface A of the valve seat 12 again under the action of the mud circulation pressure, and the whole tool moves repeatedly again, so that the purpose of continuous shock is achieved.

The mandrel part adopts a slip structure, and the slip structure can achieve the effect of continuous shock; when different well conditions meet the stuck drill, the hanging weight of the drilling tool assembly above the stuck drill part is utilized to generate stable and reliable jarring tonnage under different discharge capacities, so that the purpose of jarring and releasing the stuck drill is achieved; after the jarring function takes place, utilize mud circulation pressure to provide mechanical energy to reach the best and continue downward jarring effect.