阅读说明：本技术 一种易于引入的可退铅封油套管补接器 (Easy-to-introduce lead-removable oil seal casing pipe patching device ) 是由 补声军 郑廷碧 张腾飞 于 2021-08-30 设计创作，主要内容包括：本发明提供一种易于引入的可退铅封油套管补接器,包括上接头和外筒,上接头的下部与外筒的上端固定对接,外筒内还设置有内筒,内筒的上端与上接头的下端对应设置有相匹配的端部花键,用以传递扭矩,内筒内设置有卡瓦,且内筒的内表面设置有与卡瓦相配合的锁紧螺纹斜面,且内筒内位于卡瓦的下端处设置有用于卡瓦限位的卡瓦限位槽,卡瓦限位槽的下侧设置有卡瓦控制卡,内筒的下端还设置有铅封环,铅封环的上下两侧还设置有铅封挡环。以解决现有补接器内卡瓦的工作状态具有极大的不确定性。使用不便,甚至会造成补接失败,同时,工具不可脱手,对现场使用造成极大的安全隐患的问题。属于油气开采套管补接技术领域。(The invention provides an easily-introduced returnable lead sealing oil casing pipe patching device which comprises an upper joint and an outer cylinder, wherein the lower part of the upper joint is fixedly butted with the upper end of the outer cylinder, an inner cylinder is also arranged in the outer cylinder, the upper end of the inner cylinder and the lower end of the upper joint are correspondingly provided with matched end part splines for transmitting torque, slips are arranged in the inner cylinder, a locking thread inclined plane matched with the slips is arranged on the inner surface of the inner cylinder, a slip limiting groove used for limiting the slips is arranged at the lower end of the slips in the inner cylinder, a slip control card is arranged on the lower side of the slip limiting groove, a lead sealing ring is also arranged at the lower end of the inner cylinder, and lead sealing retaining rings are also arranged on the upper side and the lower side of the lead sealing ring. The problem that the working state of the slips in the existing make-up connector is greatly uncertain is solved. The use is inconvenient, the repair connection failure can be even caused, and meanwhile, the tool can not be taken off the hand, so that the problem of great potential safety hazard to field use is solved. Belongs to the technical field of oil gas exploitation casing patching.)

1. An easily-introduced returnable lead-sealing oil casing pipe resupply device comprises an upper joint (1) and an outer cylinder (2), wherein the upper part of the upper joint (1) is provided with an internal thread matched with a resupply oil casing pipe, the lower part of the upper joint (10) is fixedly butted with the upper end of the outer cylinder (2), the inner cylinder (4) is also arranged in the outer cylinder (2), the returnable lead-sealing oil casing pipe resupply device is characterized in that the upper end of the inner cylinder (4) and the lower end of the upper joint (1) are correspondingly provided with matched end part splines for transmitting torque, a slip (5) is arranged in the inner cylinder (4), the inner surface of the inner cylinder (4) is provided with a locking thread inclined plane (41) matched with the slip (5), a slip limiting groove (42) for limiting the slip is arranged at the lower end of the slip (5) in the inner cylinder (4), a slip control card (43) is arranged at the lower side of the slip limiting groove (42), and a lead sealing ring (7) is also arranged at the lower end of the inner cylinder (4), lead sealing baffle rings (8) are arranged on the upper side and the lower side of the lead sealing ring (7).

2. The easy-to-introduce lead-removable oil-sealing casing pipe patch according to claim 1, wherein: the device is characterized by further comprising a semicircular guide shoe (3), the lower end of the outer barrel (2) is in butt joint with the upper end of the semicircular guide shoe (3), and the lower end of the semicircular guide shoe (3) is a guide inclined plane.

3. The easy-to-introduce lead-removable oil-sealing bushing rejoining device as claimed in claim 2, characterized in that the upper end and the lower end of the outer cylinder (2) are provided with internal threads, the lower part of the upper joint (1) and the upper end of the semicircular guide shoe (3) are provided with external threads matching with the internal threads at the upper end and the lower end of the outer cylinder (2), the upper end and the lower end of the outer cylinder (2) are respectively in threaded connection with the upper joint (1) and the semicircular guide shoe (3), and an O-shaped sealing ring (10) is further arranged between the upper joint (1) and the outer cylinder (2).

4. The easy-to-introduce lead-removable oil-sealing casing pipe patch according to claim 1, wherein: an A-shaped packing (6) is arranged on the lower part in the outer cylinder (2) and positioned on the upper side of the semicircular guide shoe (3).

5. The easy-to-introduce lead-removable oil-sealing casing pipe patch according to claim 1, wherein: the inner diameter of the lower part of the upper joint (1) is provided with a sleeve limiting shoulder (11).

Technical Field

The invention relates to an easily introduced unleaded oil seal casing pipe patching device, and belongs to the technical field of oil and gas exploitation casing pipe patching.

Background

With the continuous progress of oil and natural gas exploitation, many oil and gas wells developed in early years have long service life and severe working environment, oil pipes and casings used for exploitation are inevitably corroded in different degrees, and oil pipes and casings with serious corrosion have the phenomena of local leakage and whole-section damage. The damage of oil pipes and casings will cause the interruption of oil and gas exploitation work and cause great economic loss to oil fields. Aiming at the situation, after the corroded sections of the damaged casings and oil pipes are mostly milled or cut and taken out, the casings are repaired and connected by using a casing repair connector, and the original casings are replaced by new casings. Ensuring normal exploitation work of petroleum and natural gas.

The casing pipe patching device is an oil casing pipe patching tool and is mainly used for patching and breaking a leaking oil casing pipe column. When the underground oil casing is broken and leaked, the broken and leaked part and the upper oil casing can be taken out through the working procedures of milling, cutting and the like. Then the packer type oil casing pipe coupler and a new oil casing pipe column are put in. The upper and lower butt joints are realized and permanently sealed to finish the repair joint operation. The oil casing pipe patching device is a connector for new and old oil casing pipes when a new oil casing pipe is put in after an underground damaged oil casing pipe is taken out.

However, the currently commonly used lead seal oil casing pipe patching device has the following defects due to the structural limitation:

1) the slips are in a free state in the inner cylinder, and the real-time state of the slips is not fixed, so that the slips are not always in an introduction position when being contacted with the lower oil casing, but are propped against the end part of the oil casing, so that the slips cannot be normally introduced, and the slips need to be lifted and put down for many times when being used on site until the slips are introduced. The uncertainty of the working state of the slip causes time and labor waste during use and even causes the failure of make-up connection.

2) The inner cylinder is in the outer cylinder, so that the lead seal ring can be extruded conveniently, tool sealing is realized, and the inner cylinder is also in a free state. Because of the working characteristic, after the claw fishing of the lead sealing oil casing pipe patching device is realized, if the working state needs to be quitted on site, the claw fishing cannot be realized, namely, the tool cannot be taken off the hand. This creates a significant safety hazard for field use.

Disclosure of Invention

The invention provides an easily-introduced rejoining device of a lead-removable oil-sealing casing pipe, which aims to solve the problem that the working state of a slip in the existing rejoining device has great uncertainty. The use is inconvenient, the repair connection failure can be even caused, and meanwhile, the tool can not be taken off the hand, so that the problem of great potential safety hazard to field use is solved.

In order to achieve the purpose, the easily-introduced returnable lead sealing oil casing pipe patching device comprises an upper connector and an outer cylinder, wherein an internal thread matched with the patching oil casing pipe is arranged on the upper part of the upper connector, the lower part of the upper connector is fixedly butted with the upper end of the outer cylinder, an inner cylinder is further arranged in the outer cylinder, a matched end part spline is correspondingly arranged at the upper end of the inner cylinder and the lower end of the upper connector and used for transmitting torque, slips are arranged in the inner cylinder, a locking thread inclined plane matched with the slips is arranged on the inner surface of the inner cylinder, a slip limiting groove used for limiting the slips is arranged at the lower end of the slips in the inner cylinder, a slip control card is arranged on the lower side of the slip limiting groove and used for fixing the positions of the slips, a lead sealing ring is further arranged at the lower end of the inner cylinder, and lead sealing blocking rings are further arranged on the upper side and the lower side of the lead sealing ring.

In the casing pipe patching device, the upper end and the lower end of the outer cylinder are provided with internal threads, the lower part of the upper joint and the upper end of the semicircular guide shoe are provided with external threads matched with the internal threads at the upper end and the lower end of the outer cylinder, the upper end and the lower end of the outer cylinder are respectively in threaded connection with the upper joint and the semicircular guide shoe, and an O-shaped sealing ring is also arranged between the upper joint and the outer cylinder;

in the casing pipe patching device, the lower part in the outer cylinder is positioned on the upper side of the semicircular guide shoe and is also provided with an A-shaped packing, so that the sealing of the tool at the initial stage and under a smaller pressure is realized;

in the casing pipe patching device, a casing pipe limiting shoulder is arranged on the inner diameter of the lower part of the upper joint;

in the bushing patching device, the lower end of the outer cylinder is butted with the upper end of the semicircular guide shoe, and the lower end of the semicircular guide shoe is a guide inclined plane.

Compared with the prior art, the invention ensures that the slips are fixed in the inner cylinder in real time, and the underground oil casing is introduced once when the slips are used on site, so that the completion of the patch connection operation is smoothly realized, the slips do not need to be lifted and put down for many times, the working time is saved, and the working efficiency is improved; the spline design (which can be a single spline shown in figure 2 or a multi-head spline) at the end part between the upper joint and the inner cylinder can ensure normal torque transmission while the inner cylinder axially moves to extrude the lead sealing baffle ring and the high-pressure seal after the lead sealing ring deforms, so that the tool can be used for releasing hands when needed. Solves the hidden trouble of field use, and is suitable for popularization and application.

Drawings

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

FIG. 2 is a structural schematic diagram of splines at the end parts of the upper joint and the inner cylinder.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

Examples

Referring to fig. 1 and 2, the embodiment provides an easily-introduced removable lead-sealing oil casing pipe patching device, which comprises an upper connector 1 and an outer cylinder 2, wherein the upper part of the upper connector 1 is provided with an internal thread matched with a patching oil casing pipe, and the thread type is the same as that of the patching oil casing pipe for connecting a new replacement oil casing pipe. The internal diameter of 1 lower part of top connection is provided with the spacing circular bead 11 of sleeve pipe, the spacing circular bead 11 of sleeve pipe is the last limit position of old oil sleeve pipe in the use of instrument, the upper end and the lower extreme of urceolus 2 all have the internal thread, the lower part of top connection 1, the upper end of semicircle guide shoe 3 all has with urceolus 2 upper and lower both ends internal thread assorted external screw thread, and the upper and lower both ends of urceolus 2 respectively with top connection 1 and semicircle guide shoe 3 threaded connection, still be provided with O shape sealing washer 10 between top connection 1 and urceolus 2, urceolus 2 is connected with top connection 1 and semicircle guide shoe 3 through connecting thread, form a sealed cavity, and simultaneously, inner tube 4, lead seal fender ring 8, lead seal ring 7 forms high-pressure seal, the 6 departments of A type packing provide low pressure seal, the lower extreme of guide shoe 3 is the guide inclined plane.

An inner barrel 4 is arranged in the outer barrel 2, the upper end of the inner barrel 4 is correspondingly provided with a matched end part spline 9 with the lower end of the upper joint 1, the end part spline 9 can be a single spline as shown in the figure or a multi-head spline and is used for being matched with the upper end part spline of the inner barrel 4 to transmit torque and realize tool release, a slip 5 is arranged in the inner barrel 4, the inner surface of the inner barrel 4 is provided with a locking thread inclined plane 41 matched with the slip 5 for grabbing and dragging a downhole casing, a slip limiting groove 42 used for slip limiting is arranged at the lower end part of the slip 5 in the inner barrel 4, a slip control card 43 is arranged at the lower side of the slip limiting groove 42, the slip limiting groove 42 is used for being matched with the slip 43 control card to fix the position of the slip, the slip 5 is ensured to be smoothly introduced into the downhole casing to realize patching operation, after grabbing and dragging is finished, the lead sealing ring 8 and the lead sealing ring 7 are downwards extruded to force the lead sealing ring 7 to deform, and high-pressure sealing is realized.

The lower part in the urceolus 2 is located the semicircle guide shoe 3 upside and is provided with A type packing 6, realizes the sealing when instrument initial stage and less pressure, and the lower extreme of inner tube 4 still is provided with lead seal ring 7, and the upper and lower both sides of lead seal ring 7 still are provided with lead seal and keep off ring 8, warp under the extrusion of inner tube 4, realize high-pressure seal.

The working principle is as follows: a. connect when the lead seal patching ware of new oil casing lowermost end is close oily casing in the pit, slowly rotate on one side and transfer the patching ware, make the oily casing in the pit pass through inside the semicircle guide shoe 3 gets into the patching ware, the oily casing in the pit passes through slips 5 after A type packing 6, slips 5 is pushed up earlier, later is bloated, let the oily casing in the pit pass through, after the oily casing in the pit passes through slips 5, continue to go upward the spacing circular bead 11 of sleeve pipe of supreme joint 1, the completion is grabbed and drags for.

b. After the grabbing and fishing are finished, the pipe column is lifted upwards, the slips 5 bite the underground oil casing pipe, and the make-up connector integrally enables the slips 5 to be attached to the locking spiral inclined surface 41 of the inner cylinder 4. The larger the uplift load, the tighter the slips 5 catch. Meanwhile, the inner cylinder 4 downwards extrudes the lead seal retaining ring 8 and the lead seal ring 7 under the action of pulling force, so that the lead seal ring 7 deforms, a gap between the patching device and the grappling oil sleeve is filled, and sealing is realized.

c. The A-shaped coil root 6 and the deformed lead seal ring 7 act together to seal the outer space of the oil sleeve. The A-type packing 6 is mainly used for sealing at the initial stage of a tool and under small pressure, and the lead seal ring 7 is mainly used for high-pressure sealing in a deformation mode. If a better high-pressure sealing effect is required, the effect can be achieved only by increasing the lifting force and waiting for the lead sealing ring 7 to be fully deformed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.