Search

CN-224228649-U - Pressure-controlled circulation valve

CN224228649UCN 224228649 UCN224228649 UCN 224228649UCN-224228649-U

Abstract

The utility model provides a pressure-controlled circulating valve, which belongs to the field of conventional oil and gas well fracturing test combined operation processes and comprises a mandrel, an upper joint, a rupture disc outer cylinder and a lower joint, wherein the upper joint is tubular, a first pipe for inserting an upper tool is formed at the upper part of the upper joint, a second pipe is formed at the lower part of the upper joint, the upper part of the mandrel is slidably inserted into the second pipe, the first pipe is communicated with the second pipe through a third pipe, the inner diameter of the third pipe is equal to the inner diameter of the mandrel, the inner diameter of the first pipe is larger than the inner diameter of the third pipe, and the inner diameter design ensures the smoothness of fluid in the flowing process and reduces the pressure loss. The slope is formed at the joint of the first pipe and the third pipe, the slope can effectively guide the flowing direction of fluid, the resistance and erosion of the fluid in the flowing process are reduced, particularly under the working condition of high sand quantity such as sand fracturing, the erosion of mud sand to the upper joint can be effectively reduced, and the service life of the circulating valve is prolonged.

Inventors

  • LI ZHENXIANG
  • YIN DECAN
  • ZENG PENGHUI
  • LI FAQUAN
  • DAI JUNQING
  • ZHANG CHI
  • DAI YINHONG
  • WANG YUE

Assignees

  • 中国石油化工股份有限公司
  • 中国石油化工股份有限公司勘探分公司

Dates

Publication Date
20260512
Application Date
20250623

Claims (10)

  1. 1. A pressure-controlled circulation valve, comprising: A mandrel (1), wherein the mandrel (1) is tubular; The upper joint (2) is in a tubular shape, a first pipe (21) for inserting an upper tool is formed at the upper part of the upper joint (2), a second pipe (22) is formed at the lower part of the upper joint (2), the upper part of the mandrel (1) is slidably inserted into the second pipe (22), the first pipe (21) and the second pipe (22) are communicated through a third pipe (23), the inner diameter of the third pipe (23) is equal to the inner diameter of the mandrel (1), the inner diameter of the first pipe (21) is larger than the inner diameter of the third pipe (23), and a slope (24) is formed at the joint of the first pipe (21) and the third pipe (23); The rupture disc outer cylinder (3), the said rupture disc outer cylinder (3) is set up in the middle part periphery of the said dabber (1), and the upper portion of the said rupture disc outer cylinder (3) connects with inferior part of the said upper joint (2); The lower connector (4) is sleeved on the periphery of the lower part of the mandrel (1), and the upper part of the lower connector (4) is connected with the lower part of the rupture disc outer cylinder (3).
  2. 2. The pressure controlled circulation valve of claim 1, wherein, The second pipe (22) is provided with a circulation hole (25), and the mandrel (1) is provided with a flow passage (11) matched with the circulation hole (25).
  3. 3. The pressure controlled circulation valve of claim 1, wherein, The upper inner periphery of the rupture disc outer cylinder (3) is in threaded connection with the lower outer periphery of the upper joint (2).
  4. 4. The pressure-controlled circulation valve of claim 3, A first sealing ring (61) is arranged between the upper joint (2) and the rupture disc outer cylinder (3); A second sealing ring (62) is arranged between the upper joint (2) and the mandrel (1).
  5. 5. The pressure controlled circulation valve of claim 1, wherein, The outer rupture disc cylinder (3) is provided with a rupture disc (31) matched with the mandrel (1); a shearing pin (5) is arranged between the upper joint (2) and the mandrel (1).
  6. 6. The pressure controlled circulation valve of claim 1, wherein, The upper inner periphery of the lower joint (4) is in threaded connection with the lower outer periphery of the rupture disc outer cylinder (3).
  7. 7. The pressure controlled circulation valve of claim 6, wherein, A third sealing ring (63) is arranged between the rupture disc outer cylinder (3) and the lower joint (4); A fourth sealing ring (64) is arranged between the rupture disc outer cylinder (3) and the mandrel (1).
  8. 8. The pressure controlled circulation valve of claim 1, wherein, The periphery of the lower joint (4) is provided with a fifth sealing ring (65).
  9. 9. The pressure controlled circulation valve of claim 1, wherein, The upper joint (2) is provided with internal threads.
  10. 10. The pressure controlled circulation valve of claim 1, wherein, The lower joint (4) is provided with external threads.

Description

Pressure-controlled circulation valve Technical Field The utility model belongs to the field of conventional oil and gas well fracturing test combined operation processes, and particularly relates to a pressure-controlled circulating valve. Background The fracturing test combined operation technology and the application thereof are an efficient oil and gas well development technology, and integrate a plurality of links such as stratum test, fracturing transformation and the like into one pipe column, reduce construction period and cost through optimizing a flow, and improve stratum permeability and oil and gas yield. The technology not only improves the efficiency of oil and gas exploration and development, but also provides powerful support for economic and effective development of oil and gas fields. The pressure-controlled circulating valve is one of core components in the fracturing test combined technology, and realizes the opening and closing of the valve by controlling the annular pressure, so that the circulating function is realized, and different operation requirements are met. In the fracturing process, the circulating valve can control the injection and discharge of fracturing fluid, so that the smooth proceeding of fracturing operation is ensured. However, there are some limitations to the design of conventional pressure controlled recirculation valves. The inside of the upper joint is in a ladder-shaped structure, and when sand is added for fracturing, the upper joint is easy to be eroded by muddy sand, so that the service life is reduced. The erosion not only can influence the sealing performance of the circulating valve, but also can cause the valve to be blocked or lose efficacy, thereby bringing potential safety hazards to construction. Disclosure of utility model The utility model aims to provide a pressure-controlled circulating valve, which solves the problem that an upper joint of the existing pressure-controlled circulating valve is easy to be eroded by muddy sand. In order to achieve the above object, the present utility model provides a pressure-controlled circulation valve comprising: The mandrel is tubular; The upper joint is tubular, a first pipe for inserting an upper tool is formed at the upper part of the upper joint, a second pipe is formed at the lower part of the upper joint, the upper part of the mandrel is slidably inserted into the second pipe, the first pipe is communicated with the second pipe through a third pipe, the inner diameter of the third pipe is equal to the inner diameter of the mandrel, the inner diameter of the first pipe is larger than the inner diameter of the third pipe, and a slope is formed at the joint of the first pipe and the third pipe; The rupture disc outer cylinder is sleeved on the periphery of the middle part of the mandrel, and the upper part of the rupture disc outer cylinder is connected with the lower part of the upper joint; And the lower joint is sleeved on the periphery of the lower part of the mandrel, and the upper part of the lower joint is connected with the lower part of the outer cylinder of the rupture disc. Optionally, the second pipe is provided with a circulation hole, and the mandrel is provided with a flow passage matched with the circulation hole. Optionally, an upper inner periphery of the rupture disc outer cylinder is threadedly connected with a lower outer periphery of the upper joint. Optionally, a first sealing ring is arranged between the upper joint and the outer cylinder of the rupture disc; And a second sealing ring is arranged between the upper joint and the mandrel. Optionally, the outer rupture disc cylinder is provided with a rupture disc which is matched with the mandrel; and a shearing pin is arranged between the upper joint and the mandrel. Optionally, an upper inner periphery of the lower fitting is threadably coupled to a lower outer periphery of the rupture disc outer cylinder. Optionally, a third sealing ring is arranged between the outer cylinder of the rupture disc and the lower joint; A fourth sealing ring is arranged between the outer cylinder of the rupture disc and the mandrel. Optionally, a fifth sealing ring is arranged on the periphery of the lower joint. Optionally, the upper joint is provided with an internal thread. Optionally, the lower joint is provided with external threads. The pressure-controlled circulating valve has the beneficial effects that the pressure-controlled circulating valve comprises a mandrel, an upper joint, a rupture disc outer cylinder and a lower joint, wherein the upper joint is tubular, a first pipe for inserting an upper tool is formed at the upper part of the upper joint, a second pipe is formed at the lower part of the upper joint, the upper part of the mandrel is slidably inserted into the second pipe, the first pipe and the second pipe are communicated through a third pipe, the inner diameter of the third pipe is equal to the inner diameter of the mandrel, the i