Petroleum Reservoir Evaluation and Development ›› 2022, Vol. 12 ›› Issue (4): 651-656.doi: 10.13809/j.cnki.cn32-1825/te.2022.04.013

• Field Application • Previous Articles     Next Articles

Application of circulating well flushing technology in southern Yanchuan CBM Field

SHAO Xiaoping(),CUI Bin,LIU Yaru(),XIE Xinhan,SONG Guanwei,REN Lichang,XU Jiehua   

  1. Sinopec Linfen Coalbed Methane Branch, Linfen, Shanxi 041000, China
  • Received:2022-04-28 Online:2022-08-26 Published:2022-09-02
  • Contact: LIU Yaru E-mail:1183602682@qq.com;1174334581@qq.com

Abstract:

During the drainage and gas production process of coalbed methane development, due to the pressure drop, the pulverized coal is prone to appear and brought into fracturing sand. At present, the pulverized coal and the deposition of fracturing sand have become the key factors restricting the continuous and stable drainage and production of coalbed methane. As the proportion of pulverized coal pump blockage in southern Yanchuan CBM Field is high, in order to effectively reduce the occurrence of this kind of operation, prolong the maintenance free period of gas wells, ensure the continuity of the production of the gas wells and cut the operation cost, a circulating well flushing device is developed and the supporting process is formulated. After the field tests, it is clear that the automatic circulation well flushing process can effectively reduce the pump inspection times of the gas well, the hollow rod automatic circulation well flushing process can effectively prolong the maintenance-free operating period of the gas well, and the pump down well flushing process can effectively improve the pump efficiency and increase the daily liquid production of the gas wells. The application results show that the CBM circulating well flushing device and supporting process are well applied in the mine, which can effectively improve the liquid flow velocity in the oil pipe, carry the sand and pulverized coal in the oil pipe to the ground, solve the pump sticking, pump plugging and pump leakage, and provide a new idea for on-site control of pulverized coal.

Key words: pulverized coal, automatic circulation well flushing process, hollow rod automatic well flushing technology, well flushing process under pump, maintenance-free operating free period

CLC Number: 

  • TE37