DIFFICULT TURONIAN GAS PRODUCTION METHOD Russian patent published in 2021 - IPC E21B43/267 E21B43/11 C09K8/60 

FIELD: gas production industry.

SUBSTANCE: invention relates to the gas production industry, in particular to methods of increasing the productivity of wells using hydraulic fracturing and can be used in the development of hard-to-recover gas deposits characterized by high heterogeneity and clay content. The method involves drilling a directional well with a descending profile. The production casing is lowered with subsequent perforation or liner. During drilling, the well is oriented in azimuth along the minimum stresses. Areas of productive formations are sequentially opened using a drilling mud based on an emulsion of a mixture of gas oil and water in a ratio of 7: 1. The wellbore is cased with a production string. Production casing is perforated with combined charges. Multi-stage hydraulic fracturing is carried out using a liquid based on diesel fuel. In this case, a system of parallel fractures directed along the lines of natural fracturing is formed.

EFFECT: invention increases efficiency of developing hard-to-recover gas reserves due to use of hydrocarbon-based primary drilling fluids and multi-stage hydraulic fracturing using high-viscosity hydrocarbon-based gel.

1 cl, 4 dwg