SU1663168A1 - Reactive forces compensator for downhole motor - Google Patents

Abstract

The invention relates to drilling equipment and m. used in drilling directional, horizontal and branched horizontal wells. The goal is to simplify the design. For this, the sliding work support elements are made in the form of arcuate strips 4 and cylindrical sleeves 5 and 6 fixed at their ends. The coupling 5 is from the connecting thread side for connecting the housing 1 with the stator system of the downhole motor to the housing of the left thread 7. The coupling 6 installed freely, and the housing 1 with it in the working position has a ledge 8. The sharp edges of the strips 4 are pressed into the walls of the wells, preventing further rotation of the housing 1, the movement of which along the axis of the well is not difficult due to a significant excess axial load over the friction forces of the layout elements against the borehole walls. Before lifting the assembly, the tool is rotated by the rotor of the drilling rig several turns to the right. 2 Il.

Description

The invention relates to a drilling technique and may be used in drilling directional, horizontal and branched horizontal wells with downhole motors.

The purpose of the invention is to simplify the design of the downhole motor reactive torque compensator.

FIG. 1 schematically shows a downhole motor reactive torque compensator; in fig. 2 shows section A-A in FIG. one.

The downhole motor torque moment compensator includes a housing 1 with a nipple 2 at one end to communicate with a stator downhole engine (not shown) and with ufta 3 at the other end

for communication with drill pipes (not shown). The body 1 has sliding support elements made in the form of arcuate bars 4 and cylindrical sleeves 5 and 6 fixed to their ends. The coupling 5 is located on the nipple side and is connected to the body 1 with the left thread 7, and the coupling 6 is mounted on the body 1 freely. Case 1 has a step 8, limiting the movement of clutch 6, fixing it in the working position.

In the initial position, the end face of the coupling 5 screwed onto the body rests on the end face 9 of the nipple 2, and the end face of the sleeve 6 forms, with the shoulder 8 of the housing 1, a gap H, the value of which is less than the length of the left thread 7. Distance

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between the ledge 8 of the housing and the end face 9 of the nipple 2 is greater than the total length of the couplings 5 and 6 and the arcuate bar 4 along its generatrix.

The supporting surface of the arcuate strips in the section plane, perpendicular to the axis of the housing, has a trapezoidal shape with a large base at the periphery. Such a shape of the bearing surface due to the presence of sharp edges 10 ensures reliable engagement of the slats for the walls of the well.

The compensator of the reactive torque of the downhole motor works as follows.

When the assembly is launched into the well, the support bars are deformed, the diameter along the support bars becomes equal to the diameter of the well, regardless of the change within the known limits of the latter. When starting the bouting motor, its body and shaft rigidly connected with it begin to rotate from the reactive moment to the left, screwing coupling 5 along the left-hand thread 7 until the coupling 6 stops in the ledge 8, after which further rotation of the bottom-hole engine leads to compression of the support bars. 4 and an increase in the force pressing them against the walls of the well. The sharp edges of the 10 support bars 4 are pressed into the walls of the well, preventing further rotation of the downhole motor housing, moving the latter along the axis of the well does not significantly complicate due to significant

the increase of the axial load force friction elements of the layout of the borehole wall.

Before lifting the assembly, the tool is rotated by the rotor of the drilling rig a few turns to the right in order to move the sleeve 5 to its original position, which reduces the rigidity of the support bars 4 and facilitates lifting the tool.

The use of the device prevents the rotation of the drill string from the reactive moment of the downhole motor, which simplifies the drilling technology.

Claims (1)

Claims: Downhole Motor Reactive Moment Compensator, including a housing with connecting threads for coupling with the stator system of the downhole motor on the one hand and with the drill pipes on the other, the sliding support elements located on the housing, characterized in that, in order to simplify the design, sliding work elements are made in the form of arcuate bars and cylindrical couplings fixed at their ends, the coupling from the connecting thread side for connecting the housing with the stator system the downhole motor is connected to the housing with a left-hand thread, the other coupling is mounted on the housing freely, and the housing for interacting with it in the working position has a step. Stenma snvvs / iy Aa 2