WAY OF SECONDARY DEVELOPMENT OF PRODUCTIVE POOL Russian patent published in 2002 - IPC

FIELD: oil and gas industry. SUBSTANCE: development of oil-bearing water-subjacent pools at final stage of construction of well. Proposed way includes sinking of casing string with plugs made of material destroyed chemically in well. Plugs are positioned in opposition to oil-bearing portion of pool. Tubing string is lowered into space of casing string after pressure grouting. Polymer material and chemical reagent are pumped into water-bearing part of pool in zone of location of plugs. After dissolution of plugs reagent is forced into pool and well is adopted for operation. In this case hollow plugs enter inside string with bottom parts and have weakened sections. They are set in opposition to water-bearing part of pool. Tubing string placed under atmospheric pressure is sunk in well with shearing funnel and destructible valve at end. Valve is destroyed and depression on water-bearing part of pool is formed by way of communication of face zone of pool with internal space of tubing string. Cement bridge is constructed after pumping of polymer material into water-bearing part of pool and before pumping of chemical reagent into zone of location of plugs, opposite to filter of water-bearing part of pool. EFFECT: reliable development of oil-bearing part of pool with decreased labor and material input. 4 dwg