Abstract
In order to effectually resolve the problems as embarrassing solving and cumbersome calculation in design and simulation of hydraulic fracturing in coal petrography, the productivity prediction analysis software of horizontal wells has been developed in this study based on the object-oriented visual programming environment. The analysis software can determine the rock mechanics parameters, the distribution of crustal stress and the coalbed methane production, which can greatly improve the work efficiency of the engineering staff. The software has better applicability and can provide a foundation for the analysis of CBM productivity prediction. The results show that: simulation analysis is of high precision, can satisfy the actual engineering needs. Fracture number and half-length have a greater impact on fracturing horizontal well production; moreover, crack width almost has no influence on production.
Highlights
The permeability of coal seams in China is low with mostly less than 50 mD
The cracks of hydraulic fracturing are closely related to the strata structure, rock mechanics property and ground stress (Clarkson et al, 2011; Keim et al, 2011)
Fracturing crack simulation analysis belongs to an important subject of hydraulic fracturing technology research field
Summary
The permeability of coal seams in China is low with mostly less than 50 mD. Almost all coalbed methane wells with the gas production above 1000 m3/d are reformed by hydraulic fracturing during the past 20 years of coalbed methane exploration and development process (Archer and Roland, 2001). Hydraulic fracturing can effectively ameliorate flow channel, improve coal rock diverting capacity and increase productivity, which has become the effective measure of CBM exploration. It has caused universal attention and special research of domestic and foreign experts and scholars. In case of hydraulic fracturing operation failure, it will cause the destruction of coal seam pressure system, the abandon of coalbed methane well and significant economic loss. Hydraulic fracturing crack simulation analysis has become the key problem on coal rock fracture design, construction and production forecast. The results can provide the fundamental basis for resource evaluation and fracturing stimulation plans, and have important practical significances for exploration and development of coalbed methane wells
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