Downhole flow channel type pressure control device, downhole pressure management drilling system and drilling method thereof

A managed pressure drilling and flow channel technology, which is applied in wellbore/well components, earthwork drilling, flushing wellbore, etc., can solve the problems of unseen systems or devices, save drilling time, reduce leakage, reduce The Effect of Drilling Costs

Active Publication Date: 2021-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no relevant reports on related systems or devices that can realize this function at home and abroad.

Method used

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  • Downhole flow channel type pressure control device, downhole pressure management drilling system and drilling method thereof
  • Downhole flow channel type pressure control device, downhole pressure management drilling system and drilling method thereof
  • Downhole flow channel type pressure control device, downhole pressure management drilling system and drilling method thereof

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Embodiment Construction

[0043] In order to make the technical solutions and advantages of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, and are not exhaustive of all the embodiments. And in the case of no conflict, the embodiments and the features in the embodiments of the present invention can be combined with each other.

[0044] image 3 The wellbore pressure comparison chart of the traditional managed pressure drilling method and the wellbore pressure of the downhole managed pressure drilling method of the present invention is shown. exist image 3 middle:

[0045] p L For the lower limit pressure curve of safe drilling fluid density, the larger value between collapse pressure and formation pore pressure is usually taken;

[0046] p H For the upper limit pressure curve o...

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Abstract

The invention provides a downhole runner-type pressure control device, and a downhole pressure-control well drilling system and method. The downhole runner-type pressure control device comprises an inner cylinder connected with a drilling tool, an outer cylinder capable of rotating relative to the inner cylinder, a control assembly connected to the outer cylinder for receiving an operation instruction and conducting instruction transforming, and a linkage assembly connected with the outer cylinder and the control assembly; and the linkage assembly changes the area of a runner in a wellbore under the effect of the control assembly through a linkage action, and thus wellbore pressure adjusting is achieved. The downhole runner-type pressure control device can apply the return pressure in thedownhole and only apply the return pressure to the position above the stratum needing return pressure, and thus drilling leakage is reduced or prevented.

Description

technical field [0001] The invention relates to the technical field of oil drilling operations, in particular to an downhole channel type pressure control device capable of implementing downhole pressure controlled drilling, an downhole pressure controlled drilling system and a drilling method thereof. Background technique [0002] Managed pressure drilling is an adaptive drilling technique that precisely controls the annular pressure profile throughout the wellbore. This technology can maintain the wellbore pressure within the safe drilling fluid density window range during drilling, and can effectively avoid downhole complex situations such as formation fluid invasion and leakage, and is especially suitable for deep water wells, deep wells and other wells with narrow safe drilling fluid density windows . [0003] At present, the widely used MPD system is mainly composed of pressure measurement while drilling (PWD), rotary control head (RCD), automatic choke manifold, cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/08
CPCE21B21/08
Inventor 柯珂王磊魏辽张辉王果张进双孙连忠周号博
Owner CHINA PETROLEUM & CHEM CORP
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