SU1530746A1 - Mechanical jar - Google Patents

Abstract

This invention relates to the oil and gas industries. The goal is to simplify the design and increase the reliability of operation due to the impact of axial movement of the hollow rod. For this, in the area of screw cutting of the surface of the hollow stem 4 and the corresponding surface of the upper sleeve 11 of the trip unit, evenly around the circumference, longitudinal grooves 13 are made with a depth equal to the depth of the screw cutting. In this case, the sleeve 11 is installed with the possibility of alignment of its grooves with the longitudinal grooves of the rod 4 in the initial position. The tilt angle of the screw thread is made greater than the friction angle. When the maximum tensile load is reached, the screw thread protrusions are aligned with the longitudinal grooves in the section of the screw surface of the rod 4. The latter comes out of the screw engagement with the sleeve 11 and moves abruptly upwards, while the striker strikes the anvil. The upward impact force is transmitted to the stuck tool. 4 il.

Description

installed with the possibility of matching in the initial position of its grooves with the longitudinal grooves of the rod. The front faces of the protrusions 1A of the bushings 11A and the faces of the end projections 15 of the lower bushings 8 that respond to them are inclined with an obtuse angle at the tops of the protrusions. The angle of the screw thread is made greater than the friction angle. When up

In order to maximize the tensile load, the protrusions of the screw thread are aligned with the longitudinal grooves in the section of the screw surface of the stem A. The latter comes out of the screw engagement with the sleeve 11 and moves sharply upwards, while the striker strikes the anvil. The upward impact force is transmitted to the stuck tool. 4 il.

The invention relates to the oil and gas industry, namely to impact devices for freeing stuck pipes.

The purpose of the invention is to simplify the design and increase the reliability of operation for c4eY receiving shocks during axial movement of the hollow rod.

FIG. 1 shows the mechanical IASS, general view, section; in fig. 2 is a section A-A in FIG. one; on fig.Z - section bb in fig. one; in fig. - node 1 in FIG. one .

The mechanical ss consists of a housing 1 with an anvil 2 in the upper part and an inner shoulder 3-. In Kopn, the axial stem is placed with a hollow rod k with a drummer 5. For transmitting the rotation, the hollow rod is connected to the case by splined engagement, and the hammer in the upper part has replaceable adjusting sleeve 6. The housing is filled with lubricating oil, while the floating piston 7 is installed in it. Under the inner collar 3 of the housing there is an interlock assembly made in the form of two sleeves, the bottom of which (sleeve 8) is spring-loaded relative to the housing axial direction with a spring 9. Screw cutting 10 is made on the outer surface of the hollow stem, for interacting with which on the upper sleeve 11 there is made a screw screw 12 corresponding to it 12. In the section of screw cutting the surface of the hollow rod and the corresponding surface of the upper sleeve 11 of the clutch assembly are evenly circumferentially formed longitudinal grooves 13 (Fig. 2) with a depth equal to the depth of the screw thread, and the longitudinal grooves of the upper sleeve of the trip unit and the hollow rod are combined

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in the starting position. The lower sleeve 3 of the trip unit is secured against rotation by the spline engagement with the hollow stem.

The upper and lower hubs of the decoupling unit have end lugs for interaction with each other, while the front faces of the upper lugs of the upper hub 1 and the side edges of the lugs 15 of the lower hub, which correspond to them, are inclined with an obtuse angle at the tops of the lugs. The angle of the screw thread of the hollow rod and the corresponding sleeve is made greater than the friction angle.

Mechanical ss works as follows.

The jar is connected to the pipe string using an upper sub, lowered into the well, and the lower sub is screwed into the shank of a stuck tool, while the pressure of the lubricating oil in the housing 1 is equalized with the pressure of the well fluid using the floating piston 7.

After connecting the CCA with the tool sticking to the tool, the npi-lift pipe string creates a high load on the IWS, which is transmitted to the hollow Rod k, while in its screw engagement with the upper sleeve 1J of the uncoupling unit, which is bounded from upward displacement by the inner shoulder 3 , at the points of contact of the screw threads 10 and 12, a torque is created which is a component of the axial force applied to the hollow rod k, the value depends on the magnitude of the force applied and the angle of inclination of the screw heating. Torque tends to deploy the upper sleeve 11 relative to the hollow stem C. The reversal of the upper sleeve 11 relative to the hollow stem k, in turn, is prevented by the lower sleeve 8 of the trip unit. When the calculated tensile load is reached, the upper sleeve 11 starts to unfold under the effect of the generated torque and squeezes the lower sleeve 8 with the end tabs, overcoming the force of the spring 9, the pre-compression of which, and therefore the calculated tensile load, are determined by the height of the replaceable adjusting sleeve 6.

When the maximum tensile load is reached, the protrusions of the screw threading of the upper sleeve 11 are aligned with the longitudinal grooves in the section of the helical surface of the hollow stem +, while the hollow stem leaves the screw engagement with the upper sleeve of the tripping assembly and abruptly moves upwards, while the drummer 5 moves through the replaceable adjusting sleeve 6 strikes the hull anvil 2, and the lower sleeve 8 remains in the pressed position. Using a replaceable adjusting sleeve 6, the stroke of the striker is adjusted depending on the length of the pipe string in order to maximize its elastic properties in order to achieve maximum impact force. The upward impact force is transmitted to the stuck tool. For the next strike, the column of pipes is lowered, with the hollow rod | moves down until it stops and under the action of the spring 9, the sleeve of the trip unit is reset to its original position, the upper sleeve 11 is screwed into the hollow rod, the cycle is repeated

Claims (1)

Invention Formula Mechanical ss, including a housing with an anvil in the upper part and an inner shoulder, mounted in the housing with the possibility of axial movement of a hollow rod with a hammer and screw cutting on the outer surface, the release unit in the form of two sleeves located under the inner shoulder of the housing; end protrusions, the upper of which has interacting with a screw thread of a hollow stem, an internal screw thread that responds to it, and the bottom is secured against rotation and spring-loaded relative to the body in the axial direction, which is so that, in order to simplify the design and increase reliability in operation, due to shock during axial movement of the hollow stem, on the section of the screw cutting of the surface of the hollow stem and the corresponding surface of the upper sleeve of the trip unit, evenly around the circumference, longitudinal grooves are made with a depth equal to the depth of the screw thread, the upper bushing of the disengagement assembly is installed with the possibility of combining its longitudinal grooves with the longitudinal grooves of the hollow stem in the initial position, front edges of the protrusions of the upper bushing of the uncoupling unit and the corresponding edges of the end protrusions of the lower bushing of the uncoupling node are oblique with an obtuse angle at the tops of the protrusions, and the angle of inclination of the screw thread is made exceeding the friction angle. ./ five. 1530746 B-B eleven FIG 3 I Fi (.