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Transient negative pressure unbalanced drilling device and method

An underbalanced drilling and negative pressure technology, which is applied to drilling equipment and methods, drilling equipment, earthwork drilling and production, etc., can solve the problems of reservoir pollution and low mechanical penetration rate, so as to protect the reservoir and increase the mechanical penetration rate , low cost of manufacturing and use and maintenance

Inactive Publication Date: 2017-01-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art, aiming at the problems of low ROP and serious reservoir pollution in the process of balanced and overbalanced drilling, to provide an instantaneous negative pressure underbalanced drilling device and method, which can reduce the drill string At the same time of longitudinal vibration, the axial vibration energy of the drill string is used to generate periodic instantaneous negative pressure at the bottom of the well, which reduces the rock breaking strength, improves rock breaking efficiency and ROP, reduces drilling capital investment, and protects the reservoir to a certain extent. layer from contamination

Method used

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  • Transient negative pressure unbalanced drilling device and method
  • Transient negative pressure unbalanced drilling device and method

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Embodiment

[0019] The main structure of the instantaneous negative pressure underbalanced drilling device described in this embodiment includes an upper joint 1, a diversion compression sleeve 2, an upper diversion compression sleeve flow channel 21, a ball seat body 3, a lower diversion joint 4, The lower guide joint flow channel 41, the lower guide joint central flow channel 42, the ball retainer 5, the ball 6 and the positioning pin 7; the lower joint 4 is provided with a through lower guide joint central flow channel extending along its axis direction. Road 42, the outer side is provided with the lower guide joint flow channel 41 of annular structure and the upper guide compression sleeve flow channel 21; the lower end of the lower joint 4 is provided with a connecting thread for connecting an external drill bit; the lower joint 4 The middle and upper parts are sequentially set with a ball seat body 3, a diversion compression sleeve 2 and an upper joint 1 from bottom to top, and the u...

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Abstract

The invention belongs to the technical field of oil and gas development technology and relates to a transient negative pressure unbalanced drilling device and a method. Drilling is achieved by adding the transient negative pressure unbalanced drilling device into a drilling column, an upper connector is driven by the upper portion of the drilling column to uniformly rotate in the clockwise direction, when the transient negative pressure unbalanced drilling device is driven by the drilling column to vibrate upward, a ball blocks an annulus drilling fluid channel, annulus drilling fluid in an upper diversion pressing sleeve flow channel increases pressure, annulus drilling fluid in a lower diversion connector flow channel reduces pressure simultaneously, and transient negative pressure is formed at the bottom of a well; when the drilling column vibrates downward, the lower diversion connector flow channel is opened, the annulus drilling fluid can be circulated normally, the annulus drilling fluid in the upper diversion pressing sleeve flow channel and the lower diversion connector flow channel can communicate, and pressure is recovered equally; and transient negative pressure unbalanced drilling can be achieved in the circulation. The transient negative pressure unbalanced drilling device is simple in structure, convenient to use and safe and reliable, does not consume drilling liquid energy, has no influence on a drilling tool structure, and is low in machining and manufacturing cost and using and maintenance cost.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of petroleum and natural gas development, and relates to an instantaneous negative pressure underbalanced drilling device and method for reducing drill string vibration and increasing mechanical drilling speed. [0003] Background technique: [0004] During oil and natural gas drilling, the drill string and the annular space are filled with drilling fluid. Its main functions include balancing formation pressure, carrying cuttings, and cooling the drill bit, among which balancing formation pressure is an important guarantee for the safe drilling process. Due to the existence of drilling fluid, the rock at the bottom of the well is in a three-dimensional stress state due to the huge liquid pressure, and its shape is enhanced, making it more difficult to break. increase, the difficulty of rock breaking increases rapidly, the ROP decreases, and the drilling cycle is prolonged. On the other hand, when the...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B21/08
CPCE21B7/00E21B21/08
Inventor 李志娜李振春王鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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