RU2439285C1 - Device for equipment retrieval from side wellbore of multihole well - Google Patents

Abstract

FIELD: gas and oil production.

SUBSTANCE: invention can be applied in retrieval of equipment or pipe string elements from side wellbores of multihole well. Device for retrieval of equipment from side wellbores of multihole well includes case with side port made at one side of the case above arrester with passage duct, and collet with grip lugs, mounted in the case below arrester and capable of limited axial movement up to the arrester. Arrester is fixated to the case walls. Case is equipped with ball support, and connecting thread is made in adapter connected rigidly to bushing with spherical inner surface where ball support is installed with possible limited radial leaning.

EFFECT: reliable simple construction of device allows for application in side wellbores of multihole wells without additional equipment, thus reducing manufacturing and operation costs.

2 dwg

Description

The invention relates to the oil industry, and in particular to equipment for fishing operations in the well, and can be used to extract equipment or elements of pipe columns from the sidetracks of a multilateral well (MZS).

The well-known "Rod catcher" (patent RU No. 2191246 C2, 7 E21B 31/18, publ. Bull. No. 29 from 10.20.2002), including a hollow body with connecting threads for connecting on one side with an adapter with oblique holes, and on the other, with a funnel, a conical surface is made on the inner surface of the housing, interacting with the outer conical surface of the collet, on the inner surface of which teeth are cut along a helical line, protrusions are made on the sub to fix the collet from turning relative to the housing.

The disadvantages of this rod catcher are:

- the inability to use the device in the lateral trunks of the MZS without an additional deflecting device, which significantly reduces the possibility of its use and leads to an increase in material costs;

- the possibility of using it only when removing the remaining in the well of the string of pump rods;

- complexity in manufacturing and, as a result, high material costs.

The closest technical solution is "Catcher" (patent RU No. 2171355 C1, 7 E21B 31/18, publ. Bull. No. 21 dated 07/27/2001), including a hollow body with side windows, a spring installed in it and placed under it with the possibility of limited axial movement of the collet with gripping protrusions at the ends of its feathers, mated on a spherical surface with feathers of the collet, the outer surface of the lower ends of the feathers and the inner surface of the housing under the side windows in contact with each other are made conical, and the magnitude of the axial movement collets are smaller than the conical surface of the body under the side windows, the surface of the gripping protrusions associated with the inner surface of the feathers of the collet is located at an acute angle to the axis of the collet.

The disadvantages of this catcher are:

- the inability to use the device in the lateral trunks of the MZS without an additional deflecting device, which significantly reduces the possibility of its use and leads to an increase in material costs;

- complexity in manufacturing and, as a result, high material costs.

The technical task of the invention is to create a reliable simple design of a device for extracting equipment from the sidetrack of a multilateral well, allowing it to be used in the sidetracks of the MZS, and to reduce the cost of its manufacture and operation.

The technical problem is solved by a device for extracting equipment from the sidetrack of a multilateral well, comprising a body with side windows and a conical narrowing at the bottom, a restrictor with a passage channel, a connecting thread for connecting to a pipe string connected to the body, and installed in the body below the limiter with the possibility of limited axial moving up to the limiter collet with gripping protrusions at the lower ends of its feathers, the outer ends of which are made conical interacting with a conical narrowing of the body.

What is new is that the limiter is made fixed relative to the walls of the housing, and the side window is made on one side of the housing above the limiter, while the housing is equipped with a ball bearing on top, and the connecting thread is made in the sub, rigidly connected to the sleeve with an internal spherical surface into which is inserted ball bearing with the possibility of limited radial deflection.

Figure 1 shows a device for extracting equipment from the side trunk of the MZS with a longitudinal section.

Figure 2 shows the removal of equipment by the device from the sidetrack of a multilateral well in longitudinal section.

The device comprises a housing 1 (Fig.1, 2) with a side window 2 located above the stop 3, which is made fixed relative to the walls of the housing 1. In the lower part of the housing 1 can be made, for example, teeth 4. In the housing 1 is installed with the possibility of longitudinal moving up to the limiter 3 of the collet 5. The housing 1 is equipped with a ball bearing 6. On top of that, if necessary, for example, with a large diameter production casing 7 (figure 2) of the lateral barrel 8 of the MZS (not shown) and a small diameter of the device, the ball bearing 6 may be equipped with a center 9. torus connecting thread 10 is formed in-sub 11 connected to the sleeve 12 with the inner spherical surface 13 in which is inserted a ball joint 6 with the possibility of limited radial deflection.

The device operates as follows.

A pipe string (not shown) is connected to the sub 11 (Fig. 1) by a thread 10 and the device is lowered into the interval 1.5-2.0 m above the entrance to the side trunk 8 (Fig. 2) of the MZS. Turn on the mud pump and with rotation continue the descent of the device. In this case, due to the pressure difference on the side window 2 (Fig. 1, 2), the ball bearing 6 is deflected along the spherical surface 13 in the sleeve 12 by a predetermined amount, and the device enters the side barrel 8. In the event that the equipment has an estimated interval of 14 (shown conditionally), for example, a packer, pipe string, etc. no tool landing is observed, which means that the device did not fall into the side trunk 8. In this case, it is necessary to raise the tool 1.5-2.0 m above the entrance to the side trunk 8, rotate the pipe string 90 ° and repeat the device entry into the side trunk 8. The centralizer 9, if equipped with a ball bearing 6, centers the device in the side trunk 8. When approaching the equipment 14 (figure 2), for example, with a gripping head 15, a coupling, a lock, etc., which must be removed, teeth 4 (figure 1) on the lower part of the housing 1, if necessary, clean the sludge deposited on the equipment s. Next, the collet 5 with its petals rests on the upper part of the equipment 14 and moves up to the stop in the limiter 3. After that, the collet 5 with its petals captures it from the outside. When lifting the tool, the collet 5 remains in place, and the housing 1 moves up and the upper end of the collet 5 with its circular protrusion 16 rests against a sample 17 on the housing 1, the outer side 18 of the petals of the collet 5 abuts against the conical part 19 of the lower end of the housing 1, preventing equipment from falling out when it rises to the surface. Further tension of the pipe string disrupts the equipment and removes it from the well.

The advantage of the proposed device for extracting equipment from the sidetrack of a multilateral well is that its reliable, simple design allows it to be used in the side trunks of multilateral wells without additional equipment and reduce the cost of its manufacture and operation.

Claims (1)

A device for extracting equipment from the sidetrack of a multilateral well, including a housing with side windows and a conical narrowing at the bottom, a restrictor with a passage channel, a connecting thread for connecting to a pipe string connected to the housing, and installed in the housing below the limiter with the possibility of limited axial movement up to limiter collet with gripping protrusions at the lower ends of its feathers, the outer ends of which are made conical, interacting with the conical narrowing of the body, distinguishing I mean that the stopper is made fixed relative to the walls of the casing, and the side window is made on one side of the casing above the stopper, while the casing is equipped with a ball bearing on top, and the connecting thread is made in the sub, rigidly connected to the sleeve with an internal spherical surface into which the ball Support with limited radial deflection.

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