Key technologies of horizontal well fracturing for deep coal-rock gas:A case study of Jurassic in Baijiahai area,Junggar Basin
The Jurassic coal seam in the Baijiahai area of the Junggar Basin is characterized by a low elastic modulus,high Poisson's ratio,and low hardness,presenting challenges in vertical well hydraulic fracturing such as difficulty in sanding and low gas production.To address these issues,a technical approach of"verification+exploration"was implemented.This involved on-site verification of cluster interference and exploration of the effects of different fracturing fluids on increasing production.Key findings from this approach include:① Field Tests on Vertical Wells:It was observed that targeting coal seams as the preferred layer for horizontal well drilling could yield better development outcomes.② Optimization of Fracturing Parameters:Important parameters that affect sanding difficulties and stimulation volume include cluster spacing,displacement,viscosity,proppant particle size,and sanding scale.A fracturing technology combining large displacement,high viscosity,and extensive sanding is recommended.③ Field Application of Fracturing Fluids:The use of gel fracturing fluids for long fractures and the subdivision cutting volume transformation in horizontal wells have proven to be effective techniques.These processes have significantly enhanced the production benefits of deep Jurassic coal-rock gas in the Baijiahai area,achieving remarkable results.The success of this study provides a technical breakthrough and support for the exploration and development of deep coal-rock gas,holding significant implications for the development of coal-rock gas resources in the Junggar Basin.
Junggar BasinBaijiahai areadeep coal-rock gashydraulic fracturinghorizontal well
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