Continuous circulation drilling system and method

A technology of drilling and normal circulation, which is applied in drilling equipment and methods, drilling equipment, earthwork drilling and production, etc. It can solve the problems of pump stuck, cuttings sinking, overflow and lost circulation, etc., and avoid borehole wall Loss of stability, elimination of influence, and the effects of avoiding lost circulation

Inactive Publication Date: 2017-08-01
中石化石油工程技术服务有限公司 +2
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  • Abstract
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  • Application Information

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Problems solved by technology

In this way, due to the stop and recovery of drilling fluid circulation before and after connecting a single drill pipe, the pressure in the annular space fluct...

Method used

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  • Continuous circulation drilling system and method

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] refer to figure 1 , a continuous circulation drilling system, including a drilling tool 1, a rotating blowout preventer 2 sequentially connected from top to bottom, a normal circulation outlet manifold 9, a fully sealed blowout preventer 3, an upper cross 4, and an anti-rotation hanger 5 , Inverted semi-sealed blowout preventer 6, semi-sealed blowout preventer for well control blowout prevention 7, lower cross 8 and casing head 14, and high pressure side circulation manifold 11 connected to upper cross 4, riser manifold 10. The high-pressure pipeline 12 and the throttling manifold 13 connected to the lower cross 8.

[0016] According to the continuous circulation drilling method of the aforementioned continuous circulation drilling system, the implementation steps are as follows:

[0017] In the normal positive circulation during norma...

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Abstract

The invention relates to a continuous circulation drilling system and method. The continuous circulation drilling system is formed by connecting of a rotating blowout preventer, a full-sealing blowout preventer, a semi-sealing blowout preventer, a four-way joint, an anti-rotation hanger, a circulation outlet, a high-pressure side circulation opening, a throttling flow path and the like. According to the system, in drilling of a complex stratum, drilling liquid circulation is still kept during the period of making a connection, accordingly stable equivalent circulating density and unintermittent rock debris discharging are achieved in the whole drilling period, downhole pressure is kept balance, the borehole condition is improved overall, the situations that downhole accidents such as pump suffocation, jamming of a drilling tool and overflow occur due to sand setting, wellbore instability and unbalance of the downhole pressure caused by making the connection in common drilling are avoided, and the success rate and safety of complex stratum drilling operation are improved.

Description

technical field [0001] The invention relates to a continuous circulation drilling system and method for complex structured wells in the technical fields of oil and gas drilling, geological exploration and mine drilling. Background technique [0002] During conventional drilling operations, every time a single drill pipe is drilled, it needs to be connected to another single pipe. At this time, it is necessary to stop the drilling fluid circulation in the well, connect the new single pipe, and then start the pump to resume circulation. In this way, due to the stop and recovery of drilling fluid circulation before and after connecting a single drill pipe, the pressure in the annular space fluctuates greatly, which often leads to a series of downhole problems such as cuttings sinking, well wall collapse, pump sticking, overflow and lost circulation. question. In unstable formations, narrow density windows, long horizontal sections, large displacement, and deep well drilling, t...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B21/08
CPCE21B7/00E21B21/08
Inventor 张桂林张晓明牛洪波刘晓兰唐洪林张晶晶王朔张晓林吴明波杨恒涛
Owner 中石化石油工程技术服务有限公司
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