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Sliding guide drilling closed-loop control system and sliding guide drilling closed-loop control method

A closed-loop control and sliding-steering technology, which is applied in the automatic control system of drilling, directional drilling, drilling equipment, etc., can solve problems such as affecting drilling progress and increasing drilling cost, so as to improve wellbore quality, operation efficiency and control accuracy. Effect

Active Publication Date: 2015-10-21
CHINA NAT OFFSHORE OIL CORP +1
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AI Technical Summary

Problems solved by technology

Obviously, this way of swinging the tool face relying on the experience of the driller will affect the drilling progress and increase the drilling cost

Method used

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Embodiment Construction

[0019] The present invention will be described in detail below with reference to the drawings and embodiments.

[0020] Such as figure 1 As shown, the closed-loop control system for sliding steering drilling of the present invention includes a dynamic measurement subsystem 10, a ground monitoring and decision-making subsystem 20, and an execution subsystem 30.

[0021] Among them, the dynamic measurement unit subsystem 10 includes a top drive angle / torque measurement unit 101 for measuring the top drive rotation angle or torque, a weight-on-bit measurement unit 102 for measuring the weight on bit / torque near the bit, and a The measurement-while-drilling unit 103 for measuring actual drilling hole trajectory parameters such as well deviation and azimuth and tool faces of downhole power drilling tools.

[0022] The ground monitoring and decision-making subsystem 20 includes a drilling parameter acquisition unit 201, a borehole trajectory correction unit 202, a control decision unit 203...

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Abstract

The invention relates to a sliding guide drilling closed-loop control system and a sliding guide drilling closed-loop control method. The system comprises a dynamic measuring sub system, a ground monitoring sub system and an executing sub system, wherein the dynamic measuring sub system measures parameters such as the well deflection, the orientation and the underground motor drill tool surface in real time and sends the parameters to the ground monitoring sub system; when the ground monitoring sub system discovers that the actually drilled wellbore trajectory deviates from the designed wellbore trajectory through comparison, a wellbore trajectory to be drilled is determined again according to the designed wellbore trajectory and the target spot; a top drive / turntable-bit pressure combined control plate obtained according to the many-body dynamics simulation design analysis is combined to determine the top drive / turntable rotating angle and a bit pressure regulating strategy; then, the underground tool surface and bit pressure stability is maintained through regulating the top drive / turntable rotating angle and the traveling block speed by the executing sub system and dynamically regulating the drift and the bit pressure of the underground motor drill tool surface; the sliding guide drilling wellbore trajectory closed-loop automatic control is realized; the operation efficiency and the control precision of the directional wellbore trajectory are effectively improved; and the wellbore quality is improved.

Description

Technical field [0001] The invention relates to a closed-loop control system for controlling the wellbore trajectory during directional drilling in an oil and gas field and a control method thereof, in particular to a closed-loop control system and its control for automatically controlling the wellbore trajectory when a lead screw motor is used for sliding-steering directional drilling method. Background technique [0002] In directional wells (especially high dogleg) drilling operations, the lead screw motor power drilling tool has always been dominant. Lead screw motors mainly have two working modes: rotation mode and orientation mode (or guided mode). In the process of drilling in rotary mode, the rotary table or top drive uses a low speed to rotate the drill string from the ground to transmit power to the drill bit. The elbows of the motor will evenly point in different directions to drill in a straight line. Due to changes in stratum lithology, drilling tool systems and dr...

Claims

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Application Information

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IPC IPC(8): E21B44/00E21B7/04
Inventor 李汉兴姜伟曹砚锋周建良何保生程载斌武广瑷李峰飞
Owner CHINA NAT OFFSHORE OIL CORP
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