A drilling pressure control valve for radial drilling
A technology of radial drilling and control valves, which is applied in earthwork drilling, wellbore/well components, flushing wellbore, etc., and can solve problems such as unstable drilling operations, reduced drilling efficiency, and increased operating costs , to achieve the effect of simple structure, good practicability and low operating cost
Active Publication Date: 2022-06-07
YANGTZE UNIVERSITY
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Problems solved by technology
For deep wells and ultra-deep wells, oil pipes and workover rigs have been proposed for radial drilling. The device is to use small-sized titanium alloy pipes behind the nozzles. However, in actual work, bending caused by excessive drilling pressure often occurs. Or the situation that the titanium alloy pipe is scrapped due to crushing, the drilling operation cannot be carried out normally and stably, the drilling efficiency is reduced, and the operating cost is increased. It is necessary to develop a control valve to control the drilling pressure of the tubing in real time downhole
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[0022] The radial drilling pressure control valve is composed of a casing 1, a throttling sleeve 2 and a mandrel 6; an end cover 12 is installed in a port at one end of the casing 1 through a set screw 11, and a casing on one side of the end cover 12 is installed. A mandrel 6 is installed in the body 1 through the throttling sleeve 2, one end of the mandrel 6 extends through the end cover 12 to the outer end of the casing 1, and the end of the mandrel 6 extending to the outer end of the casing 1 is provided with an external thread; An external thread is provided on the circumference of the other end of the body 1 ; the mandrel 6 is slidably connected with the end cover 12 .
[0023] The central hole of the throttle sleeve 2 of the control valve is in the shape of a funnel, and the casing 1 on one side of the throttle sleeve 2 is provided with a drain hole 7 . The throttling sleeve 2 is threadedly connected with the mandrel 6, and an elastic sealing ring 3, a V-shaped sealing r...
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The invention relates to a control valve, in particular to a drilling pressure control valve for radial drilling. It consists of a housing, a throttling sleeve and a mandrel; a mandrel is installed in the housing through a throttling sleeve, a guide body is fixedly installed on the mandrel, a friction block is slidably installed on the guide body, and the shell corresponding to the friction block The body is provided with a friction block through hole; the top of the friction block extends into the friction block through hole. The control valve has simple structure and good practicability. Through the jacking action of the guide body, the friction block can protrude radially outward, thereby preventing the oil pipe from continuing to move downward. Large-scale bending or crushing failure of the titanium alloy pipe caused by the radial drilling operation cannot be carried out normally and stably, which reduces the drilling efficiency and increases the operating cost. positive meaning.
Description
technical field [0001] The invention relates to a control valve, in particular to a radial drilling pressure control valve. Background technique [0002] At present, some oil wells, especially old wells, have the phenomenon of small oil seepage, low oil production, and low collection efficiency. Therefore, it is necessary to increase the oil output of oil wells and improve the oil recovery rate, which has positive significance for energy utilization and saving production costs. [0003] At present, in order to solve the above-mentioned problems of small oil seepage and low oil production in old wells, radial drilling technology is generally used. By drilling radial holes in the oil layer to increase the permeable area and increase the permeability, thereby increasing the oil production. For radial drilling, coiled tubing is mainly used with flexible pipes and diverters for radial drilling. This technology is mainly suitable for shallow wells. For deep wells and ultra-deep...
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IPC IPC(8): E21B21/10
CPCE21B21/10
Inventor 刘少胡黄腾辉马卫国吴春洪
Owner YANGTZE UNIVERSITY