Stimulation Techniques of Coalbed Methane Reservoirs

Table 6

Comprehensive assessment.

Classification	Stimulation technique	Factor				Total score (√)
		Stimulation effectiveness	Influence range	Duration	Environment
Laboratory-scale stimulation technique	Cryogenic liquid nitrogen (CLN)	√√√	√√√	√√	√√√	11
	Microwave heating (MH)	√√	√√√	√√	√√	9
	High-voltage electric fracturing (HVEF)	√√	√√√	√√√	√√	10
	Acidification reconstruction (AR)	√√√	√√	√√	√	7
	Microbial stimulation (MS)	√	√√	√	√	5
Field-scale stimulation technique	Hydraulic fracturing (HF)	√√√	√√√	√√√	√	10
	Hydraulic slotting (HS)	√√	√√	√√√	√	8
	Hydraulic punching (HP)	√√	√√	√√√	√	8
	Deep-hole blasting (DHB)	√	√√	√√√	√√	8
	Liquid CO2 phase-change fracturing (LCO2PCF)	√√	√	√√√	√√√	9
	Underground CMM extraction under mining-induced stress-relieved seams (EUMISRS)	√√√	√√√	√	√	8
	Gas injection (GI)	√√√	√√√	√	√√√	10