RU2070958C1 - Device for perforation of formation - Google Patents

Abstract

FIELD: oil and gas producing industry, in particular, devices for perforation of formation to ensure maximum hydrodynamic coupling of well with formation. SUBSTANCE: device for perforation of formation has suspension in form of pipes located inside body, rotary unit in form of hydraulic downhole motor, rotary motion transmission unit in form of gimbal gear, cutting unit in form of side mill, feed unit of cutting member in form of ball joint engageable with control and supporting bushings, unit for signalling on the end of cutting cycle and return of device to transportation position. Located outside the body is anchor unit in form of hydraulically unbalanced bushing with retainers. EFFECT: increased depth of perforation channel. 6 dwg

Description

 The invention relates to the oil and gas industry, in particular, to devices for opening the formation, not creating deformation in the channel zone.

 Known devices for opening the formation, in which the opening is carried out either by drilling on a flexible drive [1] or on a rigid [2] or by milling with disk cutters [3] In the first case, it is difficult to transfer sufficient torque to the flexible drive, in the second and third channel depth is limited by the diameter devices i.e. no more than 1/3 of the diameter. In addition, in all three, the cutting mode is designed for a more durable metal material, and when the column exits into the cement, jamming of the cutting elements is possible.

 A device for opening the formation is known, where the opening is performed by a pivotally fixed cutting rod [4] With this method of opening the formation, a sufficient (1.0 1.5 D) depth of the perforation channel is achieved, and the metal cutting mode is maintained. The device is equipped with an electric motor, a flexible drive, a tension spring, a flexible thread, an articulated cartridge. The disadvantage of this device is its limited power of the engine and drive, the lack of reliable fixation on the cutting point.

 The aim of the invention is to improve the hydrodynamic connection of the formation with the well by increasing the depth of the drainage channels and the filtration area.

 This goal is achieved by the fact that the device is equipped with a cutting element in the form of a rod, a ball joint that is resistant to significant loads, a hydraulic drive of the rotation unit and the feed unit of the cutting element, which provides effective cutting of the column, the rotation transmission unit in the form of a cardan transmission, the anchor unit, the signaling unit about the end of the cutting cycle and return to the transport position, which allows for effective opening of the formation at several points in one run (on pipes).

 In FIG. 1 shows the proposed device, as well as the transport position, a longitudinal section; figure 2 section a And figure 1; Fig. 3, section B B of Fig. 1; figure 4 anchor node; 5 and 6, the device is in the operating position and section, respectively.

 The device for opening the formation includes a housing 1, inside which there is a rotation unit, a rotation transmission unit, a cutting unit, a cutting element supply unit and an alarm unit about the end of the cutting cycle and the device is returned to the transport position. Outside the housing is an anchor assembly.

 The rotation unit is a downhole hydraulic screw motor with sufficient speed and power characteristics sufficient for efficient column cutting 2. The rotation transmission unit is represented by a cardan transmission 10 transmitting torque from the spindle 11 of the rotation unit through a splined joint 16 to the cutting unit. The cutting unit is represented by a side mill 9, mounted on two thrust bearings 8 in a ball joint 3 of the feed unit of the cutting element. The feed unit of the cutting element consists of a control sleeve 6 located in spline mesh with the housing and rigidly connected to the downhole motor housing, receiving the force from the differential pressure on the rotation unit, rigidly connected to the housing of the support sleeve 5 and the ball joint 3 resting on it , which is a ball truncated from above and from the sides, on the side surfaces of which control fingers are fixed. The body of the device, the control sleeve and the support sleeve have a side cutout for the exit of the cutter. The control sleeve, in addition, has a cutout that excludes the rotation of the ball joint in the horizontal plane, and horizontal grooves interacting with the fingers of the joint. The signaling unit about the end of the cutting cycle and the return of the device to the transport position is represented by radial holes in the housing 12 and disk springs, on which the control sleeve 7 rests. The anchor assembly is represented by a hydraulically unbalanced sleeve 13 located outside the housing, with spring-loaded clamps pivotally attached to it 14, having radial holes and a conical surface for the expansion of the clamps.

The device operates as follows. The device descends to the cutting point on the pipes, the mouth is sealed. When liquid is injected into pipes under the action of a working pressure drop across the downhole motor, the armature sleeve moves upward until the dies jam between the conical surface of the body and the walls of the column. At the same time, under the influence of a differential pressure, the control sleeve moves downward, overcoming the force of cup springs. In this case, the horizontal grooves of the sleeve interact with the control fingers of the ball joint, turning it around the horizontal axis and introducing the cutter to which the torque is transmitted from the downhole motor spindle into contact with the column wall. The process of cutting the perforation channel. In this case, the sleeve is shifted down and at the end of the cutting cycle, corresponding to the milling cutter deviation of 45 ^o from the vertical, opens radial holes in the device body, communicating the tube space with the annulus. The fluid injection pressure drops, which is a signal of the end of the cutting cycle. The fluid injection into the pipes stops, the Belleville springs return the control sleeve to its original position, and the latter to the vertical position of the cutter. The device moves to a new cutting point, and the cycle repeats.

Claims (1)

 A device for opening a formation comprising a body with a longitudinal channel in the wall, a body suspension, a cutting element in the form of a rod placed opposite the longitudinal channel and made with a hinge support, a rotation unit of a cutting element, a transmission transmission unit, a kinematic connecting rotation unit with a cutting element, a unit supply of the cutting element for deflecting the rotating cutting element to the wall of the well and the signaling unit about the end of the cutting cycle, characterized in that it is equipped with an anchor unit made in the form of hydraulic and an unbalanced sleeve with clamps pivotally mounted on it, located outside the housing having radial holes, a conical surface and a suspension in the form of pipes, and the rotation unit is made in the form of a downhole hydraulic motor and has a rotation transmission unit made in the form of a cardan transmission, while the feed of the cutting element is made in the form of a ball truncated from above and from the sides of the ball and a spring-loaded sleeve interacting with it, made with the possibility of perceiving the pressure drop from the rotation unit, and the signal unit The information about the end of the cutting cycle is made with the unit for returning the cutting element to the transport position and has a control sleeve placed in the housing opposite its radial holes, and cup springs placed in the lower part of the housing under the sleeve.

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