关键词: 煤层气, 智能排采, 煤粉管理, 精细控压, 定量算法, 排采制度

Abstract: Coalbed methane is complex in terms of geological conditions,and the on-site manual management mode largely constrains the effective realization of gas production potential in coalbed methane wells,making economic development difficult.Intelligent dewatering and gas production technology is one of the important approaches to reduce cost and improve efficiency,and to enhance large-scale development benefits for coalbed methane wells.During dewatering and gas production of medium-shallow coalbed methane wells,there are challenges such as the lack of quantitative algorithms for production regimes,difficulty in coordinating production regimes with reservoir energy and gas-water production and supply,and difficulty in continuous dewatering due to coal fines-induced pump sticking.Therefore,full life-cycle intelligent dewatering and gas production technology and intelligent coal fines control technology were developed,and field application effects were introduced using the Yunlian Muai coalbed methane field as an example.The results show that the intelligent dewatering and gas production technology for medium-shallow coalbed methane wells embeds quantitative algorithms for production regimes,and divides the dewatering and production process into six stages:equipment break-in stage,single-phase water stage,casing pressure buildup stage,pressure-controlled production enhancement stage,stable production stage,and decline stage.Corresponding system functions are invoked stage-by-stage for intelligent control,enabling quantitative,intelligent,and refined management throughout the full life cycle.For the problem of coal fines-induced pump sticking,real-time monitoring and early warning of parameters such as bottomhole flowing pressure and torque are used to intelligently identify coal fines in the wellbore;combined with an intelligent well-washing technology without moving the tubing string,refined management of flowing pressure during well washing is achieved,effectively solving production challenges caused by coal fines-induced pump sticking.This intelligent technology yields significant cost reduction and efficiency improvement,and achieves coordinated unity of low cost,high efficiency,high quality,and refined and intelligent management,providing technical references for efficient coalbed methane development.

Key words: coalbed methane, intelligent dewatering and production, coal fines management, refined pressure control, quantitative algorithm, dewatering and production regime