METHOD FOR MAKING LOW-PERMEABILITY CURVED SCREEN IN POROUS MEDIUM AT UNDERGROUND GAS STORAGE

摘要

FIELD: oil and gas industry.;SUBSTANCE: according to the method, existing wells are selected in an isolated zone of formation or coordinates of the new wells are marked in a site plan for drilling to create a low-permeable in-formation screen. A table of selected wells with graded growing filtration and capacity properties -FCP is compiled. The necessary volume of the screen is determined and minimized along the radius of the local screen of the well, which has the least FCP, and corresponding optimal volumes and radius of local screens, volumes of solutions and amount of gas for creation of local screens are determined. Creation of the common curved screen is started successively from the first well with the lowest FCP by pumping the calculated volumes of the solution and gas thereinto. The second well is selected which FCP is higher than in that of the previous one. The calculated volumes of the solution and gas are injected. This order is maintained up to the last well. The width of the screen, its radius and the volumes of materials and reagents used are determined by analytical dependencies using optimizations. As a result, substantial saving of reagents is achieved. Water pumping-out is not required. No downhole wells are required with their equipment with high-performance submersible pumps. No pumping and utilisation of formation water is required. Use of natural gas simplifies the technology of screen creation. The replacement of natural fuel gas with waste gas makes the technology cheaper and improves the ecological situation in the storage area.;EFFECT: increased reliability due to screen solution and gas injection, cheaper and simple screen technology and improvement of ecological conditions at the area of the gas storage.;5 tbl, 4 dwg