SU636370A1 - Casing pipe centralising device - Google Patents

Description

(54) CENTRAL PIPE CENTER

The invention relates to the technique of drilling oil and gas wells.

Known centralizer containing a movable body with a cam l.

The disadvantage is that it is not possible to provide centrifuing of the pipes, taking into account compensation for tolerances on the pipe.

A centralizer is known, consisting of upper and lower grippers mounted on a hinge, frame and power cylinders 2.

The drawback of the device lies in the impossibility of ensuring the centering of the pipes with regard to the compensation of tolerances on ovality due to the absence of movable sliders in the grippers.

The aim of the invention is to provide a centering of the pipes, taking into account the compensation of tolerances on ovality.

The goal is achieved due to the fact that the grippers are equipped with spring-loaded straps and sliders, the straps are connected to the hinge, and the sliders of the upper grips have spring-loaded sharptt.

In (lig. 1 --- general view of the centralizer; in Fig. 2, section A-A in Fig. 1; in Fig. 3 crawl. In the window in Fig. 4, the upper grip slider; in Fig. 5, the grip of the gripper .

The centralizer is designed for launching the casing KOLON1YY (see Fig. L) and consists of c-anina 1, filled as c & b, four grips 2, (two lower and HBjjc upper), arranged in parallel horizontal planes x one above the other, four pneumatic cylinders 3, which are driven, grippers 2 and pneumatic control systems (ohm, Fig. 3x. Stanin 1 (see. Fig. 1) consists of a vertical support 4, on which brackets 5 are fixed for mounting the grippers 2 and pneumatic cylinders 3.

Claims (2)

The axes of all grippers are on the same vertical line. The grip 2 (see FIG. 2 consists of a human; tei 6 mounted on brackets 5 on the hinge 7. When the tube of the jaw 6 is prefixed, the CNf are covered with a failure, forming a closed jaw. Slides 8 and 9 are placed in the jaw x 6 2 point clamping of the upper expandable pipe through June after preliminary enveloping it with the jaws 6. In the slide blocks 8 (see Fig. 3) of the lower grippers 2 for the hard installation of the centralizer on the bottom tube, the crackers 10. In the sliders 9 (see, Fig. 4) Upper grips 2 Nentri handles Eherkhnaya pipe, provided for the external balls 11, 12jtc ecnechukdcii the possibility of turning the top pipe,. Letting it go, while taking into account the compensation for tolerances on the ovality of the pipe is carried out by the lever 13; 13 bolts fi and 16 coenmisnoTCH with rods 17. The second HORSE g 17 The hinge 18 is connected to the head 19 screwed onto the front end of the 2 O rod and porous 21 ° C 3. To guarantee the pre-coverage of the tube, the jaws 6, followed by its centering by the sliders 8 and 9, provide spring straps 22 which are connected at one end to the hinge 7, and at the other end to the hinge 16. For ensuring the minimum required travel of POL351 8 and 9 at The opening of the gripper 2 on the jaw x 6 is provided for 23. The pneumatic system (see Fig. 5) is designed to control the grips 2 (of the hub and consists of two-position four-way air distributors 2 n 25 with pneumatic control and three-way air flow regulators Yab, 27 and 28. A centralizer is brought to the axis of the borehole and the nugglish grippers 2 are put on the end of the ayushka end of the casing string. When the three-way valve 26 is turned on (see Fig. 5, entering the rodless cavities of the pneumatic cylinders of their 3 nips 2 close the latter, while the pipes first cover with the jaws 6 and then tightly crawl with T1s 8. After the capture of the upper end of the casing string, guide tube, the lower part of which she misses the jaws 6 raskrETye upper gripper 2. When the three-way valve 27 (see. fig.b) there is a switching of the four-way air distributor 25 and the compressed air entering the rodless cavities of the pneumatic cylinders 3 of the upper grippers 2 closes the latter. In this case, the top. the pipe is also first covered by the jaws 6 of the upper grips 2 and only then precisely centered by the sliders 9 along the axis of the casing string. Then, the top pipe is lowered down and its threaded end enters the lower pipe sleeve. After swinging and turning on the three-way valve 28 (see Fig. 5), four-way air distributors 24 and 25 are switched simultaneously and compressed air, entering the rod cavities of all four pneumatic cylinders 3, opens all four grips 4. After opening all the grips 2, the centralizer is retracted from the axis wells in the inoperative position. After the centralizer is retracted to the non-operating position, the next pipe is pushed in and the cycle is repeated from the beginning. Claim Invention A centering device for casing, consisting of upper and lower grippers, is installed {hinged on a hinge, bed and power cylinders, characterized in that, in order to ensure the centering of the pipes, taking into account the compensation of ovality tolerances, the grips are equipped with spring-loading slides and sliders , and the straps are connected to the hinge, and the slides of the upper hooks have spring-loaded balls. Sources of information taken into account in the examination: 1.Baraz V. I. Technical tools that increase occupational safety in drilling, M., Nedra 1971, p. 36-41. 2. Baraz V. I. Technical means increasing labor safety in drilling, M., Nedra, 1971, p. 31-26. Rig. {