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A dynamic control system and method for the tool face of a downhole directional dynamic drilling tool

A dynamic control and tool face technology, which is applied to the automatic control system of drilling, directional drilling, drilling equipment, etc., can solve problems such as difficulty in determining the angle of the rotating top drive or turntable, the deviation of the wellbore from the designed trajectory, and the reduction of drilling efficiency. Achieve the effects of improving control accuracy and operating efficiency, improving wellbore quality, and reducing the probability of sticking and stuck pipe

Active Publication Date: 2017-10-03
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the conditions of formation lithology changes, mud flow changes and drill bit wear, the tool face of the dynamic drilling tool is prone to deviation, causing the actual wellbore to deviate from the designed trajectory
At present, the general method to deal with this problem is to lift the drill after stopping drilling and readjust the downhole motor to make the tool face of the downhole motor point to the correct position, but this method reduces the efficiency of drilling operations
The tool face of the downhole drilling tool can be measured in real time by using the measurement while drilling equipment, and the direction of the tool face of the downhole dynamic drilling tool can be adjusted or corrected by rotating the top drive or the rotary table according to the measurement results, but due to the drill string system in the measurement while drilling equipment Long and extensive drill string system contact with the borehole wall, making it difficult to determine the angle required to turn the top drive or rotary table

Method used

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  • A dynamic control system and method for the tool face of a downhole directional dynamic drilling tool
  • A dynamic control system and method for the tool face of a downhole directional dynamic drilling tool
  • A dynamic control system and method for the tool face of a downhole directional dynamic drilling tool

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Experimental program
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Effect test

Embodiment 1

[0022] like figure 2 As shown, when the top drive is used for drilling, the dynamic measurement unit subsystem 10 includes a mud pump speed measurement unit 101, a traveling block position measurement unit 102, a top drive lifting force measurement unit 103, a top drive angle torque measurement unit 104 and Downhole measurement while drilling unit 105 .

[0023] Feedback control subsystem 20 includes mud pump pump speed acquisition unit 201, traveling block information acquisition unit 202, top drive information acquisition unit 203, tool face acquisition unit 204, main control program unit 205, drilling tool information unit 206, drilling fluid information unit 207 , formation information unit 208 , control strategy unit 209 , measurement and control information unit 210 , speed control unit 211 for mud pump pumping drilling fluid, traveling block position control unit 212 and top drive angle control unit 213 . Wherein, the output ends of the mud pump speed measuring unit 1...

Embodiment 2

[0028] like image 3 As shown, when the rotary table is used for drilling, the principle and structure of the dynamic control system for the tool face of the downhole directional dynamic drilling tool implemented in this implementation are similar to those of the top drive for drilling, the difference is that:

[0029] In the dynamic measurement unit subsystem 10, the hook position measurement unit 106 is used to replace the traveling block position measurement unit 102, the hook load measurement unit 107 is used to replace the top drive lifting force measurement unit 103, and the turntable angle torque measurement unit 108 is used to replace the top drive angle The torque measuring unit 104 and other units are the same as those in the first embodiment.

[0030] In the feedback control subsystem 20, the hook information collection unit 214 that is electrically connected to the hook position measurement unit 106 and the hook load measurement unit 107 is used to replace the trav...

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Abstract

The invention relates to a dynamic control system and method for a tool face of a downhole directional dynamic drilling tool. The dynamic control system includes a dynamic measurement subsystem, a feedback control subsystem, a user interaction subsystem and an execution subsystem; Drilling tool information, drilling fluid information, formation information and control strategies, the feedback control subsystem establishes a multi-body dynamic model of the drilling system based on the received drilling tool information, drilling fluid information and formation information, and the dynamic measurement subsystem measures the drilling process Various information of the drilling system in the center, and pass this information to the feedback control subsystem; the feedback control subsystem judges whether the downhole drilling tool tool face exceeds the set threshold, and calculates the required top drive / turntable through multi-body dynamics simulation. The angle of rotation, the position of traveling block / hook and the pump speed of the mud pump drive the top drive / rotary table, traveling block / hook and mud pump to continue drilling so that the tool face of the downhole drilling tool returns to the designed position to complete Dynamic adjustment control of the tool face of the downhole drilling tool.

Description

technical field [0001] The invention relates to a control system and method of an oil and gas field downhole drilling tool, in particular to a dynamic control system and method for a downhole directional dynamic drilling tool face based on a multi-body dynamic model. Background technique [0002] Sliding steerable drilling is a common method for directional drilling operations, which uses downhole angled power drilling tools to build deflection. However, under the conditions of formation lithology changes, mud flow changes and drill bit wear, the tool face of the dynamic drilling tool is prone to deviation, causing the actual wellbore to deviate from the designed trajectory. At present, the general method to deal with this problem is to lift the drill after stopping the drilling and readjust the downhole motor so that the tool face of the downhole motor points to the correct position. However, this method reduces the efficiency of drilling operations. The tool face of the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B44/00E21B7/04
Inventor 姜伟程载斌何保生王平双曹砚锋周建良李汉兴武广瑷李峰飞
Owner CHINA NAT OFFSHORE OIL CORP
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