System using solenoid groups to achieve electromagnetic guiding distance measurement while drilling

Abstract

The invention provides a system using solenoid groups to achieve the electromagnetic guiding distance measurement while drilling (MWD) and providing precise guiding measurement and calculation for the directional drilling control of dual horizontal wells, communicated wells, infill wells, relief wells and other complex wells. The system mainly comprises a nipple joint of the solenoid group, a converted MWD device, an adjacent well distance calculation system and surface equipment. By arranging two orthogonal solenoid groups as a magnetic signal emission source in a drilled well, the system of the invention can generate a rotating magnetic field just as that generated by the rotating magnetic nipple joint of an RMRS (rotating magnet ranging system), thus ensuring the measurement precision equivalent to that of the RMRS; meanwhile, by using the method for increasing the current intensity of the solenoid coil, the system of the invention can increase the intensity of the magnetic signal emission source and help extend the distance measurement range; and the invention has the advantages of high guiding accuracy, wide distance measurement range and simple structure, thus providing an effective hi-tech way for the detection and control while drilling the adjacent well distance.

Description

technical field [0001] The invention relates to a distance-while-drilling detection system for adjacent wells of complex-structured wells, and belongs to the technical field of underground resource drilling and production engineering. Background technique [0002] In the development of oil, natural gas, coalbed methane and other underground oil and gas resources, complex structure wells such as double horizontal wells, U-shaped wells, multi-lateral wells, cluster wells, infill wells and interconnected 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, R...

AI Technical Summary

Problems solved by technology

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 above requirements, their core technologies are still kept secret and monopolized.

In addition, MGT (Magnetic Guidence Tool) uses a solenoid as a magnetic signal emission source, and the range of the MGT can be increased by increasing the current intensity of the solenoid coil, etc., but its measurement accuracy is limited, and it is generally used in double-horizontal wells; RMRS (Rotating Magnet Ranging System) is simple in structure and easy to use, and it is also the system with the highest measurement accuracy in the current guidance system while drilling. However, because the permanent magnet group sub-joint is used as the magnetic signal emission source, its signal source strength is severely limited. Difficulty increasing the ranging range of RMRS

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