Electromagnetic distance measurement guide system for double solenoid set during drilling

A technology of double solenoids and steering systems, which is applied in the directions of measurement, earthwork drilling, wellbore/well components, etc. It can solve the problems of wasting drilling time, long measurement and data transmission time, etc.

Inactive Publication Date: 2010-10-06
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

On the basis of MGT and RMRS, the inventor researched and designed "a solenoid group electromagnetic ranging and guiding system while drilling" in the previously applied pat

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  • Electromagnetic distance measurement guide system for double solenoid set during drilling
  • Electromagnetic distance measurement guide system for double solenoid set during drilling
  • Electromagnetic distance measurement guide system for double solenoid set during drilling

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Embodiment Construction

[0048] The present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0049] Such as figure 1 As shown, the hardware of the electromagnetic ranging and guidance system with double solenoid group while drilling is mainly composed of double solenoid group pup joints, modified MWD, ground equipment and so on. The modified MWD is placed in the drilling, at the installation position of the traditional MWD behind the drill bit, to detect two sets of rotating magnetic fields with different frequencies generated by the sub-joint of the double solenoid group in the adjacent well (drilled). Then, the detected magnetic vector signal is used by the data analysis and adjacent well spacing calculation program in the MWD downhole processor to calculate the relative position of the sub-section of the double solenoid group to the modified MWD, and transmit the calculation results to the surface display system. Furthermore, combined with the pos...

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Abstract

The invention discloses an electromagnetic distance measurement guide system for a double solenoid set during drilling. The system can provide accurate guide measurement and calculation for well track control of double horizontal wells, communicated wells, U-shaped wells, infill wells, and other complex-structure wells. The system mainly comprises a double solenoid set pup joint, a converted MWD,a ground display system, ground equipment, and the like. The double solenoid set pup joint serving as a magnetic signal emission source is put into a drilled well, two rotating magnetic fields with different frequencies are generated, and the system has the measurement accuracy equivalent to the RMRS. During measurement and calculation, the spacing between adjacent wells and relative azimuth can be accurately detected and calculated without dragging the double solenoid set pup joint. Therefore, the measurement can be finished in short time. The data analysis and adjacent well spacing calculation program of the system can be put underground, only a little of calculated necessary data is transmitted to the ground, and the data transmission time is saved. Meanwhile, by improving the current intensity of a solenoid coil, and the like, the intensity of the magnetic signal emission source is improved, and the distance measurement range of the system is easily increased. The system has the advantages of high guide accuracy, wide distance measurement range, short measurement time, and simple structure, and is an effective high-tech means for the detection and control of the distance between the adjacent wells during drilling.

Description

technical field [0001] The invention relates to an electromagnetic guidance system for measuring the distance of adjacent wells while drilling, and belongs to the technical field of underground resources drilling and production engineering. Background technique [0002] In the exploitation of underground resources such as oil, natural gas and coalbed methane, complex structure wells such as double horizontal wells, interconnected wells, U-shaped wells and infill wells require accurate detection of the distance between adjacent wells while drilling. At present, the measurement-while-drilling tools commonly used in China cannot directly measure the distance between adjacent wells, so it is difficult to meet the special requirements of detection-while-drilling for the distance between adjacent wells in wells with complex structures. Although foreign countries have developed electromagnetic guidance systems while drilling (such as MGT, RMRS, etc.) that can basically meet the abo...

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Application Information

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IPC IPC(8): E21B47/09E21B47/02E21B47/092
Inventor 高德利刁斌斌
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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