RU2391486C1 - Tool to lower pipes into well - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil-and-gas industry, namely to smooth-end-pipes tripping. Pipe tripping tool comprises elevator, pipe pinchers and coupling device. Note here that said coupling device represents two-stage semi-rings with handles pivoted together with their free ends locked in closed state. Note also that lower stage can be fitted on pipe coupler end while upper stage represents detachable elements with their inner surface representing a funnel coated with wear resistant material. Lower part is furnished with spring-loaded locking elements.

EFFECT: simple and reliable design, lower risks of damaging threaded ends on pipes to be coupled.

2 dwg

Description

The invention relates to the oil and gas industry, and in particular to the technology of tripping operations of pipes with smooth ends, for example, casing pipes or pipes of overlapping wells.

It is known "Device for centering pipes" (autosw. SU No. 603740, ЕВВ 19/00, publ. Bulletin No. 15 of 04/25/1978), containing cylindrical elements with slots mounted one inside the other on a common axis, with this, in order to increase reliability, by preventing displacement of the pipe string during the centering process, the surface of the inner element in contact with the pipe is eccentric relative to its outer surface, the surface of the inner element having a line of contact with the surface of the outer element.

The disadvantages of this device are:

- high requirements for manufacturing accuracy and relative position of the outer and inner cylindrical elements of the device, because centered pipes after bringing the device into working position should be on the same axis for proper screwing them together;

- low reliability of the longitudinal fixation of the pipes placed inside the device, when the efforts of the locking screw may not be enough to hold one of the pipes, which can lead to its unauthorized disruption and impact on the end (or thread) of the other pipe and mutual damage to the ends (or threads) of the screwed pipes .

The closest in technical essence and the achieved result is a "Tool for lowering tubing into the well" (patent RU No. 2257460, ЕВВ 19/00, publ. Bull. No. 21 dated 07/27/2005), consisting of a pipe elevator with an earring, pipe wrenches, a spider, and it includes a docking device made in the form of a two-stage union sleeve equipped with a handle with an open longitudinal pharynx under the tubing, the lower stage being able to fit on the end of the coupling of the tubing and is associated with the outer diameter of this coupling, and the upper stage is made in the form of a funnel with a diameter of a small base located on the boundary between the steps, corresponding to the outer diameter of the tubing, and the lower stage of the docking device is coupled to the coupling along its outer diameter for more than half coupling perimeter.

The disadvantages of this device are:

- the difficulty of centering screwed pipes, because the operator is forced to hold the docking device on the lower pipe coupling and at the same time guide the upper pipe to the open mouth of the device, which is difficult when the attachment is swaying strongly and can lead to damage to the thread of the lower pipe on the surface of the device;

- the impossibility of complete screwing pipes due to the design of the docking device.

The technical task of the invention is the creation of a simple and reliable design of the device for guiding and centering pipes with smooth ends in the process of screwing and lowering into the well, eliminating damage to the threads of the joined pipes.

The technical problems are solved by a tool for lowering pipes into the well, including an elevator, pipe wrenches, a docking device made in the form of a two-stage union sleeve equipped with handles, the lower stage being made to fit on the pipe end face, and the inner surface of the upper stage is made in the form of a funnel .

New is that the docking device is made in the form of a sleeve diametrically cut into two parts, the parts of which are pivotally connected by one ends, and the other ends of the parts are made with the possibility of fixing in the closed state of the sleeve, while the upper stage is made in the form of removable elements, the inner surface of which the inside is covered with an elastic wear-resistant material made with the possibility of sliding interaction with the pipe nipple thread, and the lower part of the upper stage is equipped with a spring-loaded fix draining elements.

Figure 1 shows a docking device mounted on the sleeve end of the pipe, partially in section. Figure 2 - docking device, top view.

The tool for lowering the pipes into the tell-tale includes an elevator, pipe wrenches (not shown), a docking device made in the form of a two-stage union sleeve equipped with handles 1 (Fig. 1), the lower stage 2 being fixed due to internal radial protrusions 3 from longitudinal downward movements the coupling end 4 of the pipe 5, while centering the device relative to the coupling end 6 of the pipe 5, and the upper stage 7 has an inner surface 8 made in the form of a funnel.

At the same time, the docking device is made in the form of a sleeve diametrically cut into two parts and consists of two half rings 9 (Fig. 2) and 10, connected at one end with a swivel joint 11, and having, on the opposite side, for locking in a locked state, a lock 12. The lock 12 can be made of any known design, which allows you to adjust the locking force of the device at the sleeve end 6 (figure 1) of the pipe 5, for example, in the form of a rotary latch 13 (figure 2), fixed with an axis 14 in the groove 15 of the protrusion 16 half rings 10 s possible awn rotation in a plane perpendicular to the central axis of symmetry of the device. The rotary latch 13 has at the end a thread 17 with an adjusting nut 18 screwed onto it, and the half ring 9 contains a protrusion 19 with a groove 20 corresponding to the protrusion 16 with the groove 15 of the half ring 10.

The inner surface 8 (Fig. 1) of the upper stage 7 of the device is coated from within with elastic wear-resistant material 21 and is removable in the form of metal inserts 22 (usually 2 pcs.), Gummed, for example, with a rubber layer and fixed in the upper stage 7 of the device using screws 23, with the possibility of sliding interaction with the nipple thread 24 of the descent pipe 25.

The inner radial protrusions 3 fixing the lower stage 2 have bevels 26 from top to bottom and are made at the same time, thanks to the springs 27, pressed inside the lower part of the upper stage 7 of the device.

The device operates as follows.

At the wellhead, for example, by means of a spider (not shown), a pipe 5 is fixed, on the coupling end 6 of which a docking device is installed, fixing it with the lower stage 2 using the protrusions 3 on the coupling end 4 of the pipe 5 and closing it with a lock 12 (Fig. 2). To do this, move the rotary latch 13 around the axis 14 into the groove 15 of the half ring 10 until the threaded end 17 of the groove 20 of the protrusion 19 of the half ring 9 contacts and fix it by tightening the nut 18 until it stops against the end 28 of the protrusion 19. In this case, the device is tightly fixed in the closed position due to, for example protruding inside the lower stage 2 (figure 1) of the rubber rings 29.

Then, with the help of the elevator, the pipe 25 is hooked up and lowered, guiding it with a nipple thread 24 inside the upper stage 7 of the docking device. In this case, due to the elastic coating 21 on the inner surface 8 of the upper stage 7, unauthorized shocks are suppressed and softened when the nipple thread 24 of the pipe 25 interacts with the surface 8, thereby eliminating damage to the thread 24. Upon reaching the locking tabs 3, the thread 24 of the pipe 25 begins to interact with the bevels 26 protrusions 3, which, overcoming the resistance of the springs 27, move inside the lower part of the upper stage 7 of the device, without interfering with the fixation and screwing of the nipple thread 24 of the pipe 25 at the sleeve end 6 of the pipe 5. At the end of the make-up of pipes 5 and 25, the docking device is removed by opening the lock 12 (Fig. 2) and, holding the handles 1, part the rings 9 and 10 around the hinge 11 apart. The operation is repeated until all pipes are screwed up.

After completion of work, in case of damage to the elastic coating 21 (Fig. 1) of the inner surface 8 of the upper stage 7 of the device, unscrew the screws 23 and remove the inserts 22, replacing them with new ones. As a result, the device is always ready for use.

The advantage of the proposed tool for lowering pipes into the well is that the design of the docking device allows you to reliably center and screw pipes with smooth ends, eliminating damage to the threads of the joined pipes.

Claims (1)

A tool for lowering pipes into the well, including an elevator, pipe wrenches, a docking device made in the form of a two-stage cap sleeve equipped with handles, the lower stage being made to fit on the pipe end face, and the inner surface of the upper stage is made in the form of a funnel, characterized in that the docking device is made in the form of a sleeve diametrically cut into two parts, the parts of which are pivotally connected by one ends, and the other ends of the parts are made with the possibility of fixing in a closed m bushing state, the upper stage is formed as a removable element, the inner surface of which is coated with a wear-resistant elastic material adapted to slidably interact with threaded pipe nipple and the bottom of the upper stage provided with a spring-loaded locking elements inside.

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