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Drilling overflow control method and system

A control method and control method technology, applied in earthwork drilling, wellbore flushing, wellbore/well components, etc., can solve problems such as inability to effectively control drilling overflow

Active Publication Date: 2022-03-29
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Abstract
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Problems solved by technology

[0003] Existing technologies and methods mostly focus on the monitoring and identification of overflow, and cannot effectively control the overflow of drilling

Method used

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  • Drilling overflow control method and system
  • Drilling overflow control method and system
  • Drilling overflow control method and system

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0038] Those skilled in the art know that the embodiments of the present invention can be implemented as a system, device, device, method or computer program product. Therefore, the present disclosure may be embodied in the form of complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0039] In view of the fact that the existing technology cannot effectively control the overf...

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Abstract

The invention provides a drilling overflow control method and system. The overflow control method of the drilling includes: adding back pressure at the drilling wellhead; obtaining the increase rate of the bottom hole overflow or the decline rate of the bottom hole pressure after the drilling well head is added back pressure; according to the increase speed of the bottom hole overflow or the bottom hole Judging the overflow type by the pressure drop rate; when the overflow type is underbalanced overflow, obtain the drilling parameters; calculate the maximum allowable initial overflow volume according to the drilling parameters; Select the overflow control method of drilling to control the overflow of the well; when the overflow type is gravity displacement overflow, according to the initial bottomhole overflow, the bottomhole overflow within the late arrival time and the wellhead Pressure selects the overflow control method of drilling to control the overflow of drilling, which can effectively control the overflow of drilling and win time for overflow control.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to a drilling overflow control method and system. Background technique [0002] Overflow is one of the most common downhole complex accidents that affect drilling safety. Overflow will not only increase the investment cost of exploration and development, resulting in low efficiency of oil and gas development, but also cause major vicious accidents such as pipe sticking and blowout if the control is not effective. In recent years, with the development and application of precise MPD technology, the overflow and leakage caused by conventional technology "unpredictable" and "uncontrollable" have been improved. Therefore, it is of great significance to study the overflow control method based on fine pressure control. [0003] Existing technologies and methods mostly focus on the monitoring and identification of overflow, and cannot effectively control the overflow of drill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/08
CPCE21B21/08
Inventor 史肖燕周英操蒋宏伟郭庆丰
Owner BC P INC CHINA NAT PETROLEUM CORP
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