Drilling technology for the horizontal section of the intercept well in structural coal
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The Third Institute of Resources and Environment Investigation of Henan Province, Zhengzhou Henan 450000, China

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P634

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    Abstract:

    Coalbed methane is an unconventional natural gas resource. Traditionally it is extracted by surface drilled vertical wells through water drainage and depressurizing, but this method has low output and poor economic benefit. The intersected well set is a kind drilling technology for coalbed methane mining, which is composed of a vertical target well and an intercept horizontal well. The horizontal well can be connected with the vertical well inside the coal seam ,or in the roof or bottom of the coal seam; while at present, most horizontal wells are drilled inside the coal seam. Coalbed methane horizontal wells are a kind of technology which is not very expensive but can increase production effectively. It has been used more and more in coalbed methane mining. This paper introduces drilling technology for the horizontal section of the intercept well in structural coal where the coal seam structure has formed local structural stratification, such as broken coal, broken coal, chlamy coal, and the stability of the coal seam is poor. The successful completion of the intersected well set under this geological condition is of great significance to further enrich the development technology for coalbed methane and to promote the overall development of high-,medium- and low-rank coalbed methane.

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History
  • Received:March 31,2021
  • Revised:March 31,2021
  • Adopted:July 06,2021
  • Online: December 06,2021
  • Published: September 01,2021