CN-117662067-B - Diverter valve and downhole power tool

CN117662067BCN 117662067 BCN117662067 BCN 117662067BCN-117662067-B

Abstract

The invention provides a diverter valve and an underground power tool, wherein the diverter valve comprises an upper joint, a piston, a spring and a lower joint, the upper joint is provided with a first flow passage which is axially arranged, the upper end of the upper joint is connected with an upstream drill column, the lower end of the upper joint is fixedly and hermetically connected with the lower joint, the lower joint is provided with a second flow passage which is axially arranged, the lower end of the lower joint is fixedly connected with downstream equipment, the second flow passage comprises a first section and a second section, the piston and the spring are arranged in the first section, the lower end of the piston is in contact with the upper end of the spring, a central orifice is arranged on the piston, the central orifice can generate throttling pressure difference to drive the piston to downwards compress the spring, the lower joint is provided with a diverter hole, the initial position of the piston is used for sealing the diverter hole, and the ratio of the flow area of the diverter hole to the downstream distance of the piston is increased from top to bottom. The downhole power tool includes the diverter valve. The invention has the advantages of meeting the requirement of small rated displacement of the screw rod, simultaneously increasing the circulation displacement, circulating drilling cuttings and propping agent out of a shaft, and the like.

Inventors

LIU ZHIYAO
MAO HU
FANG FUJUN
YUE MING
LIU JIALIN
PENG HAO
MA XIAOLONG
LI YUANYUAN
SUN ZHAOYAN
DONG ZHIGANG
YI JUNLIANG
SONG DAN
DAI QING
LI XUEFEI

Assignees

中国石油天然气集团有限公司
中国石油集团川庆钻探工程有限公司

Dates

Publication Date: 20260508
Application Date: 20220901

Claims (10)

1. A diverter valve is characterized in that the diverter valve comprises an upper joint, a piston, a spring and a lower joint, wherein, The upper joint is provided with a first flow passage which is axially arranged, the upper end of the upper joint is connected with an upstream drill string, and the lower end of the upper joint is fixedly and hermetically connected with the lower joint; the lower joint is provided with a second flow passage which is axially arranged, and the lower end of the lower joint is fixedly connected with downstream equipment, wherein the second flow passage comprises a first section and a second section, and the diameter of the first section is larger than that of the second section; The piston and the spring are arranged in the first section, the lower end of the piston is in contact with the upper end of the spring, the outer wall of the piston is in contact with the inner wall of the first section, a central orifice is arranged on the piston, and the central orifice can generate a throttling pressure difference when fluid flows through to drive the piston to downwards compress the spring; The outer wall of the lower joint is provided with a diversion hole, and the diversion hole communicates the first section with the outside of the lower joint; the flow dividing hole comprises more than one inverted T-shaped throttling hole which are uniformly distributed along the circumferential direction of the lower joint and are positioned on the same plane; The initial position of the piston seals the shunt hole; From top to bottom, the ratio of the flow area of the diversion hole to the downstream distance of the piston is gradually increased.
2. The diverter valve of claim 1, wherein the one or more inverted-T orifices comprise 2-6.
3. The diverter valve of claim 1, further comprising a packing disposed on the first segment and configured to form a dynamic seal with a piston surface.
4. The diverter valve of claim 1, further comprising a seal disposed between the upper and lower fittings.
5. The diverter valve of claim 1, wherein the upper joint comprises a first barrel section and a second barrel section, the first barrel section having an outer diameter greater than an outer diameter of the second barrel section, the second barrel section having an outer diameter equal to a diameter of the first section, the second barrel section disposed in the first section.
6. The diverter valve of claim 5, wherein the second barrel section is fixedly connected to the first section by threads.
7. The diverter valve according to claim 1, wherein the lower connector lower end is further provided with a housing, the housing outer wall is provided with threads, and the lower connector lower end is fixedly connected with downstream equipment through threads.
8. The diverter valve of claim 1, wherein the diverter valve has an input flow of 76-550 l/min, an output flow of 76-189 l/min, and a diverter flow of 0-361 l/min.
9. The diverter valve of claim 5, wherein the first barrel section has threads on an inner wall thereof, the threads decreasing in diameter from top to bottom.
10. A downhole power tool comprising the diverter valve according to any one of claims 1-9, further comprising a screw motor and a shoe, the screw motor being arranged at the lower end of the diverter valve, the shoe being arranged at the lower end of the screw motor.

Description

Diverter valve and downhole power tool Technical Field The invention relates to the technical field of drilling equipment, in particular to a diverter valve and a downhole power tool. Background At present, shale gas development mainly adopts a horizontal well development mode, after horizontal well drilling is completed, fracturing is required, and after fracturing is completed, continuous oil pipe drilling is generally adopted to grind an inner bridge plug. In the fracturing process of shale gas horizontal wells, the sleeve deformation phenomenon often occurs, so that the bridge plugs used are soluble, but for various reasons, the soluble bridge plugs are often not completely dissolved in the well, so that the well bore is blocked. To remove the well bore blockage, continuous oil pipe is used to drill and mill the well through the drill and mill pipe string. After the sleeve is deformed, the diameter of the sleeve is greatly reduced, a screw motor matched with the inner diameter of the sleeve and grinding shoes cannot pass through the deformation point of the sleeve, and smaller screw motor and grinding shoes are required to drill and grind a through well. Therefore, a diverter valve is needed to be designed, which not only meets the requirement of small rated displacement of a screw motor, but also can increase the circulation displacement of a shaft and effectively circulate out drill cuttings and propping agents in the shaft. Disclosure of Invention The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, it is an object of the present invention to provide a diverter valve that can circulate cuttings and proppant out of the wellbore while increasing the circulation displacement while meeting the low rated displacement requirements of the screw. It is another object of the present invention to provide a downhole power tool that can circulate cuttings and proppant out of the wellbore while increasing the circulation displacement while meeting the low rated displacement requirements of the screw. In order to achieve the above object, the present invention provides, in one aspect, a diverter valve including an upper joint, a piston, a spring, and a lower joint, wherein, The upper joint is provided with a first flow passage which is axially arranged, the upper end of the upper joint is connected with an upstream drill string, and the lower end of the upper joint is fixedly and hermetically connected with the lower joint; the lower joint is provided with a second flow passage which is axially arranged, and the lower end of the lower joint is fixedly connected with downstream equipment, wherein the second flow passage comprises a first section and a second section, and the diameter of the first section is larger than that of the second section; The piston and the spring are arranged in the first section, the lower end of the piston is in contact with the upper end of the spring, the outer wall of the piston is in contact with the inner wall of the first section, a central orifice is arranged on the piston, and the central orifice can generate a throttling pressure difference when fluid flows through to drive the piston to downwards compress the spring; The outer wall of the lower joint is provided with a diversion hole, and the diversion hole communicates the first section with the outside of the lower joint; The initial position of the piston seals the shunt hole; From top to bottom, the ratio of the flow area of the diversion hole to the downstream distance of the piston is gradually increased. In an exemplary embodiment of an aspect of the present invention, the flow dividing hole may include one or more inverted T-shaped orifices uniformly distributed along the circumference of the lower joint and located on the same plane. In an exemplary embodiment of an aspect of the present invention, the one or more inverted T-shaped orifices may include 2 to 6. In an exemplary embodiment of an aspect of the present invention, the diverter valve may further include a packing disposed on the first section and sleeved on the piston, the packing being disposed on the first section and capable of forming a dynamic seal with a surface of the piston. In one exemplary embodiment of an aspect of the present invention, the diverter valve may further include a seal disposed between the upper joint and the lower joint. In one exemplary embodiment of an aspect of the present invention, the upper joint may include a first barrel section having an outer diameter greater than an outer diameter of a second barrel section having an outer diameter equal to a diameter of the first section, and a second barrel section disposed in the first section. In an exemplary embodiment of an aspect of the invention, the second barrel section and the first section may be fixedly connected by threads. In an exemplary embodiment of an aspect of the present invention, a housing may be furthe