METHOD OF BUILDING AND OPERATION OF UNDERGROUND GAS STORAGE IN SANDWICH-TYPE NONUNIFORM LOW PENETRATION SLIGHTLY CEMENTED TERRIGENOUS RESERVOIRS WITH UNDERLAYING WATER-BEARING STRATUM Russian patent published in 1999 - IPC

FIELD: gas industry. SUBSTANCE: method comes to drilling injection-development wells equipped with flow tubings, injection into pay-out bed of gas and extraction of gas. Injection-development wells are drilled with horizontal termination of bore hole and are arranged in clusters with vertical well. First pay-out bed and partially underlaying water bearing stratum are drilled in and local characteristics of bed are determined. Basing on obtained data, well profile and program of injection-development wells with horizontal termination of bore hole are defined more accurately. Then 3-8 injection-development wells with horizontal termination of bore hole are drilled. Horizontal termination of bore holes are arranged along radii from center of cluster and are lined with filters length of each horizontal termination of bore hole being 250 m and more. Point of entry of each horizontal termination of bore hole into top of pay-out bed is arranged at a distance not less that 100 m from vertical well bore hole which is used as injection well. EFFECT: reduced building costs. 2 cl, 3 tbl, 2 dwg