RU2519091C2 - Assembly of joint and transfer of detonation of shaped-charge perforator - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to shaped-charge perforator assemblies and is designed to joint the cases together and to transmit detonation. Proposed assembly comprises first and second parts articulated by split joint. Transfer charge is arranged in said first part and connected via first intake charge with detonating cord. Second intake charge is arranged in second charge and connected with second detonating cord. Blank bore is made at said first part with thread at bore part to accommodate damping sleeve. Transfer shaped-charge is arranged inside damping sleeve. Damping sleeve and transfer shaped-charge are secured inside said blank bore by the sleeve screwed to said first part.

EFFECT: higher reliability.

3 dwg

Description

The invention relates to nodes of a cumulative casing punch and is intended to connect the casings and transmit detonation.

Analogs are known that contain the first and second parts, interconnected by a detachable hinge, a transfer charge placed in the first part and connected through the first receiving charge to the detonating cord, a second receiving charge placed in the second part and connected to the second detonating cord (see for example, a description of the invention to patent RU 2081305, IPC 6 E21B 43/117, publication date 06/10/1997; description of the invention to application RU 9610935, IPC 6 E21B 43/116, publication date 07/20/1998).

A disadvantage of the known analogues is the insufficiently high reliability of operation.

The closest analogue is the Cantilever body puncher knot connection and detonation transmission unit, comprising first and second parts interconnected by a detachable articulated joint, a transfer charge placed in the first part and connected via a first receiving charge to the detonating cord, a second receiving charge placed in the second part and connected to the second detonating cord (see, for example, the description of the invention to patent RU 2120028, IPC 6 E21B 43/117, publication date 10/10/1998).

The disadvantage of the closest analogue is not high enough reliability

The technical result of the claimed solution is to increase the reliability of operation.

The essence of the technical solution is expressed in that the assembly comprises first and second parts interconnected by a detachable articulated joint, a transfer charge placed in the first part and connected through the first receiving charge to the detonating cord, a second receiving charge placed in the second part and connected to a second detonating cord, characterized in that in the first part there is a blind hole with a thread on the part of the hole in which the shock-absorbing sleeve is placed, the transfer gears are located inside the shock-absorbing sleeve th cumulative charge, while the shock-absorbing sleeve and the transfer charge are fixed inside the hole by means of a sleeve connected by a threaded connection to the first part, the first receiving charge and detonating cord are fixed in the sleeve by means of an additional sleeve of elastic material.

The essence of the technical solution is illustrated by the following drawings.

Figure 1 is a view in longitudinal section;

figure 2 is a view in longitudinal section of the first part;

figure 3 is a view in longitudinal section of a detachable swivel.

The knot of connection and transmission of detonation of a cumulative casing punch contains a first part 5 and a second part 6, interconnected by a detachable swivel (Fig.1, 2, 3). The cumulative transfer charge 1 is placed in the first part 5 and connected through the first receiving charge 2 to the detonating cord 7. The second receiving charge 3 is placed in the second part 6 and connected to the second detonating cord 8. In the first part 5 there is a blind hole with a thread on the part of the hole in which the shock-absorbing sleeve 15 is placed. Inside the shock-absorbing sleeve 15, the cumulative transfer charge 1 is placed. The shock-absorbing sleeve 15 and the cumulative transfer charge 1 are fixed inside the blind hole of the first part 5 by means of the sleeve 9, s unity threaded connection with a first portion 5 (Figure 1). The shock-absorbing sleeve 15 compensates for the part of the load from the explosion of the transfer cumulative charge 1 and the transfer of the load to the walls of the first part 5. The first receiving charge 2 and detonating cord 7 can be fixed in the sleeve 9 by means of an additional sleeve 11 of elastic material (figure 2). The first part 5 and the second part 6 have grooves for sealing elements and threaded sections on their outer surfaces to provide a threaded connection to the housing of the corresponding module of the cumulative casing punch. In the first part 5, blind holes for the tool can be located, by means of which the first part 5 is connected by rotation along the thread with the housing of the corresponding module of the cumulative casing punch (Figs. 1, 2). In the second part 6, chamfers can be made on the outside to interact with a wrench-type tool when connecting the second part 6 by threading with the case of the corresponding module of the cumulative casing punch (Fig. 1). The shock absorbing sleeve 15 may be made of rubber. The first part 5 and the second part 6 have high tightness and protection of the internal parts from moisture and soil particles.

The detachable articulation of the first part 5 and the second part 6 provides not only the connection and disconnection of adjacent modules of the cumulative casing punch, but also the rotation of the modules of the cumulative casing punch by an angle φ between the longitudinal axes of the modules when the cumulative casing punch is placed in a well with curved sections (Fig. 3 ) Moreover, the largest angle φ between the longitudinal axes of the first part 5 and the second part 6 is determined by the position of the cumulative casing punch with a nominal diameter of 50 mm in a casing with a diameter of 168 mm. The operation of the cumulative transfer charge 1 and receive charge 3 at the largest angle φ has been experimentally confirmed.

The cumulative transfer charge 1 by means of a cumulative jet is guaranteed to penetrate a steel barrier with a thickness of 45 mm or less.

In the developed designs, the maximum thickness of punched steel partitions is not more than 10.5 mm, thereby guaranteeing the transfer of detonation from the transfer cumulative charge 1 to the receive charge 3.

The safety of the knot and transmission of the detonation of the cumulative casing punch is ensured by the design and strength of the material of the first part 5 and the second part 6.

The results of tests of the knot of connection and transmission of detonation of a cumulative case perforator with filling the air gap between the first part 5 and the second part 6 with chips and soil are positive and confirm an increase in the reliability of operation.

When using the first part 5 as the upper extreme element of the first upper module of the cumulative casing punch, lowered on the cable, the transfer charge 1 is connected to the electric detonator 4, while the wire 14 after the electric detonator 4 is connected at its end with a screw connection to the sleeve 12 (figure 2). A centering sleeve 10 may be located on the electric detonator 4 (FIG. 2).

After installing and equipping the cumulative transfer charges and receiving charges of the first part 5 and the second part 6 to adjacent modules of the cumulative casing punch, the modules are connected by detachable articulation by pre-positioning at an angle of about 90 °, introducing the end of the second part 6 into the first part 5 and turning until the longitudinal axes of the modules coincide. The adjacent modules of the cumulative casing punch can be connected before lowering into the well.

After the cumulative case perforator lowered into the well reaches the desired location, a detonation wave is initiated, which propagates along the perforator along detonation cords with overcoming the first part 5 and second part 6 when the cumulative transfer charges 1 and receiving charges 3 are triggered with the destruction of the thin elements of the first part 5 and the second part 6, facing each other, by a cumulative jet of transfer cumulative charges 1.

Claims (1)

A knot of connection and transmission of detonation of a cumulative casing punch, containing the first and second parts interconnected by a detachable hinge, a transfer charge placed in the first part and connected through the first receiving charge to the detonating cord, a second receiving charge placed in the second part and connected to a second detonating cord, characterized in that in the first part there is a blind hole with a thread on the part of the hole in which the shock-absorbing sleeve is located, inside the shock-absorbing sleeve a cumulative transfer charge is placed, wherein the shock absorbing sleeve and the transfer charge are fixed inside the hole by means of a sleeve connected by a threaded connection to the first part.

Images