SU734390A1 - Hydraulic jars - Google Patents

Description

The invention relates to a drilling technique, namely, devices for releasing a stuck drilling tool in a well. An open-type hydraulic ss is known, including a housing, a differential chamber and a shock rod 1. A tensile force equal to the product of a hydraulically unbalanced ss area and the hydrostatic pressure of the washing liquid column must be applied to the ss operation. Therefore, when working in deep wells filled with an enhanced mud solution, it is impossible to put YASS into operation due to the limited strength of the drill string. Known designs of closed type are known, whose operation does not depend on the hydrostatic pressure in the annulus. The closest in technical dryness to the present invention is a closed-type hydraulic IASS, including a housing with an anvil, a stem and a hydraulic brake consisting of a piston and a stepped brake chamber 2. The disadvantage of this ssa is the design complexity, the longer ssa length, its flexibility, and how as a result, a small shock force. The purpose of the invention is to reduce the dimensions of the SSA, as well as to ensure the possibility of its operation both in low-temperature and high-temperature wells. This goal is achieved by the fact that in a hydraulic system comprising a housing with an anvil, brushes and a piston hydraulic brake with a stepped brake chamber, the latter is concentrically placed in the stem, with a hydraulic communication channel in the stem body, which informs a smaller brake chamber step with a well space. The drawing shows a hydraulic IASS in section. The hydraulic ss comprises a housing 1 with a shoulder 2, which is an anvil; pin 3, screwed into sub 4; a piston hydraulic brake consisting of a stepped chamber 5 and a piston 6. The hydraulic brake is placed concentrically in the rod 3, the piston 6 of the hydraulic brake is mounted on a separating tube 7, which is screwed on the lower sub 8.

In the upper part of chamber 5 there is a hole for filling with brake fluid, which is closed by plug 9. In piston 6, longitudinal channels are drilled into which rods 10 are inserted, of the required length and diameter. The brake fluid flows through the annular gap between the rod 10 and the walls of the channel. 8-10 such channels can be drilled in the piston, which are successively interconnected, thus forming a labyrinth passage of the required length for the flow of fluid.

A channel 11 is drilled in the body of the rod 3, which communicates with a smaller step a of the brake chamber 5. Through the separation plug 12, the pressure in the brake chamber is maintained equal to the annular pressure of the washing liquid column, thereby providing favorable sealing conditions, their rings 13 and 14 and increases the performance of ss as a whole.

Works as follows.

After transferring to the mechanical compressive load equipment, the sub 4 with the rod 3 is displaced relative to the separation tube to its lowest position. In this case, the piston 6 departs from the collar of the tube 7, and the brake fluid freely flows over the wide annular gap c.

When lifting the drill pipe string, the tensile force is transmitted through the sub 4 to the rod 3, which begins to move upwards. The piston 6 presses against the collar of the tube 7, tightly closing the annular gap into. From this point on, the brake fluid in the lower part of the chamber can flow into the upper only along the narrow annular gap formed between the walls of the danal and the rod 10.

Depending on the conditions of the work, the required hydraulic pressure for the flow of brake fluid is regulated by the total length or gap between the channel walls and the rod 10.

Due to this, the elastic strain energy is accumulated in the drill string. As the stem 3 moves upward, its internal annular groove appears above the sealing sleeve

15, after which the brake fluid flows over a wide annular gap between the walls of the piston and the annular groove of the brush 3 in the absence of hydraulic resistance.

In this case, elastic compression of the pipe string occurs, as a result of which the speed of movement of the rod 3 increases sharply, and it strikes with its cylindrical protrusion into the ledge 2 of the housing 1.

For re-strike

The drilling tool is once again allowed to create a compressive load, and the sub 4, together with the stem 3, freely returns to its lowest position.

During the subsequent tensioning of the drill

tool re-strike occurs.

If necessary, a torque can be transmitted to the located equipment through the sub pipe 4 and the rod 3 through the drill pipe string.

The described YASS has advantages over known constructions. The length of the cop was reduced by about 2 times compared with the cops adopted for the prototype. Yass is versatile, can be successfully used both in deep and shallow

wells. During operation, good performance and reliability of the SSA was confirmed.

Claims (2)

1. USSR author's certificate number 175461, cl. E 21 V 31/02, 1965. 2.R Zantsev N. F. To the question of the work of a hydraulic system. Lime higher educational institutions. “Oil and Gas, No. 5, 1963, p. 21-26 (prototype).