RU2136840C1 - Disconnecting device - Google Patents

Abstract

FIELD: oil and gas production industry. SUBSTANCE: device actually relates to construction and repair of wells. Device has internal body and external body adapted for telescopic interaction. Located between internal and external bodies is ball-type detent. Seat is adapted for telescopic interaction with internal body of device and with ball-type detent. Device is provided with setting pipe union, and seat is provided with circular locking ring and is adapted for additional telescopic interaction with external body of device. Application of aforesaid embodiment of disconnecting device allows at minimal labour and time for carrying out technological operations such as lowering and cementation of incomplete casing strings for isolation of medium and upper flooded beds with application of only one cementation plug, etc. in vertical, inclined, and horizontal wells. In performing aforesaid operations, cost is reduced by 1.8-2.0 times, and emergency situations are made less probable. Device is simple in design, easy to manufacture and operate. EFFECT: higher efficiency. 1 dwg

Description

 The invention relates to the field of oil and gas industry, specifically to the construction and repair of wells.

 Known "Disconnecting device of the drill string" (see ed. St. N 1062370, according to MKI E 21 B 17/00, 08/04/1980.), Including the upper and lower telescopically connected cases with a stop between them, placed in the respective sockets, and a hollow sleeve configured to interact with said stopper.

 Closer to the proposed “Disconnecting device” (see the book “Handbook of a Drilling Engineer”, Volume 2, edited by V. I. Mishchevich, N. A. Sidorov, M., “Nedra”, 1973, p. 187 , Fig. XIX.4), including a telescopic interaction between the inner and outer shells with a ball retainer between them, a saddle made with the possibility of telescopic interaction with the inner shell and the ball retainer.

 Both the analogue and the prototype cannot be used to install casing shanks during well cementing, since an excessively narrowed central channel prevents the passage of the cork plug during cementing.

 The objective of the invention is to create the design of a disconnecting device for installing casing shanks.

 The problem is solved by the described disconnecting device, including made with the possibility of telescopic interaction between each other, the inner and outer bodies with a ball retainer between them, a saddle made with the possibility of telescopic interaction with the inner body and the ball retainer. New is that it is equipped with an installation pipe, and the saddle is equipped with an annular retaining ring and is made with the possibility of additional telescopic interaction with the outer casing.

 Studies of patent and scientific and technical literature have shown that such a combination of essential features is new and has not been used before, and this, in turn, allows us to conclude that the technical solution meets the criterion of "novelty."

 The attached drawing shows a General view of the proposed device.

 The disconnecting device of the pipe string contains: inner 1 and outer 2 bodies, telescopically connected to each other by a ball retainer 3, located in the sockets 4 and 5, made in the housings 1 and 2 in the form of coaxial holes, the screw 6, the seat 7, keeps the ball retainer from falling out, made with the possibility of telescopic interaction with the outer casing 2 and the ball lock 3. In the transport position, the saddle 7 holds the shear screw 8. In addition, the device is equipped with a mounting pipe 9, and the saddle 7 is equipped with an annular stop ring 10. In this case, the seat 7 is made with the possibility of additional telescopic interaction with the inner casing 1. The disconnecting device is equipped with the necessary seals 11 and 12 and the thrust ring 13. For connecting to the necessary technological equipment, connecting threads 14, 15 and 16. The number of ball clamps 3 may vary, symmetrically spacing over the cross section depending on the operating conditions.

 The device operates as follows.

 To the installation pipe 9 on the thread 14, a tubing string (tubing) is connected (not shown in the drawing), a shoe pipe (not shown in the drawing) is attached to the thread 15 of the outer casing 2, and the necessary set of casing pipes to the thread 16 ( not shown in the devil). A device thus connected is lowered into the well to a predetermined depth and cement mortar is injected. The injection of cement mortar ends with the passage and landing in the saddle 7 of the forcing plug (not shown in the drawing), while the retaining ring 10 fixes the position of the forging plug. The subsequent increase in pressure causes the shear screw 8 to be cut off and the saddle 7 to be moved down, which causes the sockets 5 to open and the ball clips 3 to fall inside the device, this, in turn, causes the inner 1 and outer 2 cases to disengage. Next, the tubing with the inner casing 1 is removed to the surface, and the outer casing 2 with the saddle 7 remains in the well.

 The use of a disconnecting device will allow technological work (lowering and cementing the “fly” liners to shut off the middle and upper waterfloods using only one cementing plug, etc.) at the minimum cost of labor and time in vertical, deviated and horizontal wells. When performing the above work, the device will reduce costs by 1.8-2.0 times and reduce emergency situations. The device is simple in design, technologically advanced in manufacture and operation.

References:
1. Analogue: "Disconnecting device of the drill string", ed. N 1062370, according to MKI E 21 B 17/00, dated 04/08/1980

 2. Prototype: "Disconnecting Device", book "Handbook of a Drilling Engineer", volume 2, edited by V.I. Mishchevich, N.A. Sidorova, M., "Nedra", 1973, p. 187, fig. XIX. 4.

Claims (1)

 The disconnecting device, comprising a telescopic interaction between the inner and outer bodies with a ball retainer between them, a saddle made with the possibility of telescopic interaction with the inner housing and a ball retainer, characterized in that it is provided with an installation pipe, and the saddle is provided with an annular retaining ring and made with the possibility of additional telescopic interaction with the outer casing.