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A closed-loop control system and control method for sliding steerable drilling

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

Active Publication Date: 2017-10-03
CHINA NAT OFFSHORE OIL CORP +1
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  • Description
  • Claims
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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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  • A closed-loop control system and control method for sliding steerable drilling
  • A closed-loop control system and control method for sliding steerable drilling
  • A closed-loop control system and control method for sliding steerable drilling

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Embodiment Construction

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

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

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

[0022] The surface monitoring and decision-making subsystem 20 includes a drilling parameter acquisition unit 201 , a well trajectory correction unit 20...

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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 and control method for controlling wellbore trajectory during directional drilling in oil and gas fields, in particular to a closed-loop control system and control method for automatically controlling wellbore trajectory when using a steering screw motor for slide-steering directional drilling method. Background technique [0002] Steering screw motor power drilling tools have always had an advantage in directional wells (especially high dogleg) drilling operations. There are two main modes of operation for lead screw motors: rotary mode and directional mode (or guide mode). During drilling in rotary mode, the rotary table or top drive rotates the drill string from the surface at low speed to transmit power to the drill bit, and the motor's elbows point evenly in different directions to drill in a straight line. Due to changes in formation lithology, changes in drilling tool system and drilling en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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