RU1600420C - Device for gripping and releasing plain-end drill pipes - Google Patents

Abstract

FIELD: well drilling and operation. SUBSTANCE: device body 1 has radial recesses for pipe introduction and is suspended by hoist rope 3 with the aid of flexible ties 4 and 5. Installed in sides of body 1 are two pipe gripping members with levers of which each is connected with ties 4. Secured to body 1 is control lever 8 for limited turning relative to body 1. Suspended from free end of lever 8 is additional flexible link 9. Connected with its one end to hoist rope 3 above point of attachment of ties 4 and 5 is the other additional flexible link 10 whose other end is connected with body 1. Point of attachment of link 10 to body 1 is symmetrical relative to points of attachment of respective ends of flexible ties 4 and 5 on pipe gripping member and lever 8. To catch a pipe, lever 8 is lowered. Under gravity body 1 lowers, flexible ties 4 are tensioned to turn pipe gripping member up to pipe and to grip it. To release pipe, link 10 is pulled. Body 1 is raised to release pipe from pipe gripping member and device is withdrawn. Then, device is lifted by means of rope 3 up to its initial position. To release grip, link 9 is tensioned to turn lever 8. Then, body 1 is lifted to unload it by means of flexible ties 5. When rising, body 1 loosens tie 4 and pipe gripping member, turning round its axis, free radial recess of body 1, and device is withdrawn from pipe by link 9. EFFECT: extended field of application of device. 4 dwg

Description

 The invention relates to techniques for drilling and operating wells, can be used in installations for drilling and well repair.

 The aim of the invention is to expand the scope.

 In FIG. 1 shows a lifting installation with two positions of the described device (when lifting pipes with a dashed line); figure 2, the proposed device with a captured pipe; figure 3 is the same side view; figure 4 is the same, top view.

 The pipe gripping device comprises a housing 1 having a radial groove 2 for introducing the pipe (shown by thin lines) and suspended on the hoisting rope 3 by means of flexible rods 4 and 5. In the housing 1 on the sides there are two pipe clamping elements 6 equipped with levers 7, each of which is connected with flexible rods 4. A lever 8 is pivotally mounted on the housing with the possibility of limited rotation relative to it.

 The device is additionally equipped with two flexible links 9 and 10, one of which 9 is suspended on the free end of the lever 8, and the other 10 is connected at one end to the hoisting rope 3 above the point of attachment of the flexible rods 4, 5, and the other end is connected to the housing 1 of the device . At the same time, its fixing point on the housing is located symmetrically relative to the fixing points of the corresponding ends of the flexible rods 4, 5 on the pipe-clamping elements 6 and the control lever 8.

 The device operates as follows.

 When lifting the pipe string, the upper worker, located at the side, after unscrewing the candle, holding the device for gripping at the level of hands by the lever 8, leads him to the candle. To put on the grip, the worker, pressing on the lever 8, pulls the rod 5, thereby lifting the casing 1 of the relative traction cargo rope 3. At the same time, the rods 4 and pipe clamping elements 6 are loosened, turning on their axes, release the radial groove 2. In this state, the device is guided onto the pipe until it is touched, after which the worker releases the lever 8 and the housing 1, under the action of its own mass, goes down and thrust 4, pulling, rotate the tube clamping elements 6 until it stops with the pipe, thereby capturing the pipes . Then the worker, using the drive of the traction (cargo) rope 3, raises the captured pipe from the lower coupling connection, transfers it to the pipe shop and lowers the candle at a distance of 1.5 to 3 m to the stop of its lower end on the floor of the lower working platform. In this position, the capture device is lowered below the flight level. To release the candle from the grip, the upper worker, pulling the flexible link 10, lifting the housing 1, releases the pipe body from the pipe-clamping elements 6, removes the device from the pipe, and then with the help of the traction rope 3 raises it to its original position.

 When the pipe string is lowered into the well, the candles are cycled up. To do this, the upper worker captures the candles in the tube store using the device described above in the initial position, after which the candle rises to the lower coupling connection and the lower end of the candle is inserted into the column coupling. In this position, the gripping device is 1.5-2.5 m higher than the upper working due to the difference in the level of the column coupling and the lower working platform. To release the gripper, the upper worker pulls the already flexible link 9, thereby turning the lever 8, and raises the housing 1, unloading it by means of the rod 5. Housing 1, rising, loosens the rod 4, the pipe-clamping elements 6 rotate around their axes, release the radial groove 2 and the device with the same link 9 is pulled from the candle, freeing it for subsequent make-up with the column.

Claims (1)

 DEVICE FOR CAPTURE AND RELEASE OF SMOOTH DRILLING PIPES, characterized in that, in order to expand the scope of application, it is equipped with two additional flexible links, one of which is attached to the hoist rope above the point of attachment of flexible rods on it and the second end is connected to the body, and the other link is suspended on the free end of the control lever, while the fastening point of the first flexible link on the body is symmetrical with respect to the fastening points of the corresponding ends of the flexible rods on the pipes clamping elements and the control lever.

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