阅读说明：本技术 一种无限循环短节 (Unlimited circulation nipple joint ) 是由 侯立东 冯炜 王德刚 于 2020-07-02 设计创作，主要内容包括：本发明的一种无限循环短节属于石油作业设备技术领域,包括壳体,其壳体的侧壁上螺纹连接着旁通水嘴,壳体内腔中置有芯轴,芯轴的前端置于换向活塞芯杆内、换向活塞芯杆尾端的芯轴上依次套装着换向中间芯杆、弹簧、弹簧套挡圈和锁紧螺母,芯轴尾部套装着平衡活塞和连接环,换向活塞芯杆的内孔直口上安装中心水嘴。本发明的一种无限循环短节,结构设计合理,使用操作方便,有效的解决了钻井过程中出现的井漏问题,工作效率高、节省人力、财力和时间,避免了严重的井漏会引发井壁坍塌、卡钻和井喷的事故。发现井漏无需起钻,能得到立即处理,避免井漏逐步扩大。能够进行无限次的随钻堵漏作业,有效保护BHA钻具组合和井下仪器,并且不影响正常作业。(The invention discloses an infinite circulation nipple, which belongs to the technical field of petroleum operation equipment and comprises a shell, wherein the side wall of the shell is in threaded connection with a bypass water nozzle, a core shaft is arranged in the inner cavity of the shell, the front end of the core shaft is arranged in a reversing piston core rod, a reversing middle core rod, a spring sleeve retainer ring and a locking nut are sequentially sleeved on the core shaft at the tail end of the reversing piston core rod, a balance piston and a connecting ring are sleeved on the tail part of the core shaft, and a central water nozzle is arranged on an inner hole straight opening of the reversing piston core. The infinite circulation nipple joint provided by the invention has the advantages of reasonable structural design and convenience in use and operation, effectively solves the problem of lost circulation in the drilling process, has high working efficiency, saves manpower, financial resources and time, and avoids the accidents of well wall collapse, drill sticking and blowout caused by serious lost circulation. The well leakage can be immediately processed without pulling out the well, and the gradual expansion of the well leakage is avoided. The drilling plugging device can perform unlimited times of drilling plugging operation, effectively protect BHA drilling tool assemblies and underground instruments, and does not influence normal operation.)

1. The utility model provides an unlimited circulation nipple joint, including casing (1), threaded connection is being gone up on the lateral wall of its characterized in that casing (1) bypass water injection well choke (2), casing (1) inner chamber is put dabber (19), the front end of dabber (19) is put in switching-over piston core bar (6), core bar (9) in the middle of the suit is in proper order on dabber (19) of switching-over piston core bar (6) tail end, spring (10), spring housing retaining ring (11) and lock nut (12), balanced piston (13) and go-between (16) are being put to dabber (19) afterbody suit, the front end of dabber (19) is arranged in to installation center water injection well choke (5) on the hole straight mouthful of switching-over piston core bar (6).

2. The infinite loop short section according to claim 1, characterized in that the lower end of the reversing piston core rod (6) is butted with the upper end of the reversing middle core rod (9), the ends are uniformly provided with the equal-division teeth (20) which are matched, butted and meshed for use, and the guide grooves (21) are arranged between the adjacent equal-division teeth (20).

3. The infinite loop short section according to claim 1 or 2, characterized in that the threaded hole of the reversing piston core bar (6) is provided with the central side water nozzle (3), the outer diameter sealing groove of the reversing piston core bar (6) is provided with the sealing ring (7), and the outer diameter guiding belt groove of the reversing piston core bar (6) is provided with the guiding belt I (8) for the piston rod.

4. The infinite loop short section according to claim 1 or 2, characterized in that the front end of the spring (10) is arranged in the spring hole sleeve of the reversing middle core rod (9), and the tail end is arranged in the spring sleeve retainer ring of the spring sleeve retainer ring (11).

5. The infinite loop short section according to claim 1 or 2, characterized in that the outer diameter guide belt groove of the balance piston (13) is provided with a piston rod guide belt II (14); and a sealing ring (15) is arranged in an outer diameter sealing ring groove of the balance piston (13).

6. The infinite loop short section according to claim 1 or 2, characterized in that the inner hole of the connecting ring (16) is in spline connection with the outer diameter of the mandrel (19), the outer diameter of the connecting ring (16) is in threaded connection with the thread of the inner hole of the casing (1), and a sealing ring (18) is arranged in a groove at the tail end of the mandrel (19) to seal the inner hole of the casing (1) and the mandrel (19).

7. An infinite loop short as claimed in claim 1 or 2, characterized in that the mandrel (19) outside the coupling ring (16) is threaded with a back cap (17).

Technical Field

The invention belongs to the technical field of petroleum operation equipment, and particularly relates to an infinite circulation short joint.

Background

With the development of oil and gas exploration and development, the number of deep wells, complex wells and special process wells is increased year by year, the well leakage problem is a very difficult problem in the well drilling process, a large amount of manpower, financial resources and time are often wasted, serious well leakage can cause well wall collapse, drilling blockage and blowout accidents, even one well can be scrapped, and huge economic loss is caused. Although many plugging techniques and methods have been proposed, the problem of drilling lost circulation has not been effectively solved to date. The main reason is that the lost circulation is not treated in time, so that the lost circulation is more serious and even out of control. The development of well drilling technology, downhole power tools and measurement while drilling instruments are commonly used, and the fault of the downhole tools or instruments can be caused by the passing of plugging materials, so that the leakage is found to need to be taken out of a drill to replace a plugging drilling tool combination, the operation efficiency is reduced, the operation cost is improved, the leakage cannot be immediately treated, the leakage is gradually enlarged, and the stability of a well wall and the safety of well control are seriously influenced. The traditional leakage stoppage joint can only be used for opening and closing the bypass once or for a plurality of times, and the operation effect cannot be effectively improved.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an infinite circulation short joint.

The invention relates to an infinite circulation nipple, which comprises a shell, wherein the side wall of the shell is in threaded connection with a bypass water nozzle, a mandrel is arranged in the inner cavity of the shell, the front end of the mandrel is arranged in a reversing piston core rod, a reversing middle core rod, a spring sleeve check ring and a locking nut are sequentially sleeved on the mandrel at the tail end of the reversing piston core rod, a balance piston and a connecting ring are sleeved at the tail part of the mandrel, and a central water nozzle is arranged on an inner hole straight port of the reversing piston core rod.

As a further improvement of the invention, the lower end of the reversing piston core rod is butted with the upper end of the reversing middle core rod, the end of the reversing piston core rod is uniformly provided with equal teeth matched with the butting and meshing for use, and guide grooves are arranged between the adjacent equal teeth.

As a further improvement of the invention, a threaded hole of the reversing piston core rod is provided with a central side water nozzle, a sealing ring is arranged in an outer diameter sealing groove of the reversing piston core rod, and a guide belt I for the piston rod is arranged in an outer diameter guide belt groove of the reversing piston core rod.

As a further improvement of the invention, the front end of the spring is arranged in a spring hole sleeve of the reversing middle core rod, and the tail end of the spring is arranged in a spring sleeve retainer ring of a spring sleeve retainer ring.

As a further improvement of the invention, a guide belt II for the piston rod is arranged in a guide belt groove on the outer diameter of the balance piston; and a sealing ring is arranged in the groove of the outer diameter sealing ring of the balance piston.

As a further improvement of the invention, the inner hole of the connecting ring is in a spline structure and is connected with the spline of the outer diameter of the mandrel, the outer diameter thread on the connecting ring is connected to the thread of the inner hole of the shell, and the groove at the tail end of the mandrel is internally provided with a sealing ring for sealing the inner holes of the mandrel and the shell.

As a further improvement of the invention, the mandrel outside the connecting ring is in threaded connection with the back cap.

The infinite circulation nipple joint is reasonable in structural design and convenient to use and operate, effectively solves the problem of lost circulation in the drilling process, is high in working efficiency, saves manpower, financial resources and time, and avoids the accidents of well wall collapse, drill jamming and blowout caused by serious lost circulation, even one well can be scrapped, and the problem of huge economic loss is caused. The well leakage can be timely treated when being found, and the underground power tool, the measurement-while-drilling instrument and the plugging drilling tool are combined and used simultaneously, so that the well leakage is found without tripping, the operation efficiency is greatly improved, the operation cost is reduced, the well leakage can be immediately treated, the well leakage is prevented from being gradually enlarged, and the stability of a well wall and the safety of well control are ensured. The traditional leakage stoppage joint can only be used for opening and closing the bypass once or for a plurality of times, and the operation effect cannot be effectively improved. The infinite circulation nipple can perform infinite leakage stoppage operation while drilling, effectively protect BHA drilling tool assemblies and underground instruments, and does not influence normal operation.

Drawings

FIG. 1 is a longitudinal cross-sectional view of the present invention;

FIG. 2 is an enlarged view of a portion of the structure of FIG. 1A;

FIG. 3 is an enlarged view of a portion of the structure of FIG. 1B;

FIG. 4 is a schematic structural view of a reversing piston core rod;

FIG. 5 is a schematic structural view of an intermediate core rod.

Detailed Description

The infinite loop short joint of the present invention will be further described with reference to the accompanying drawings.