DEVELOPMENT METHOD OF GAS WELL WITHOUT PACKER IN CONDITIONS OF ABNORMALLY LOW FORMATION PRESSURES Russian patent published in 2010 - IPC E21B43/25 E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to development of gas wells in conditions of abnormally low formation pressures - ALFP, especially in conditions of decreased formation pressures. Development method of gas well without packer in ALFP conditions involves gas supply from operation wells to booster compression station - BCS, where gas is compressed to the pressure of 5.0-5.5 MPa. After BCS the gas is supplied to gas processing facility - GPF, where gas is cleaned from mechanical impurities and water, and gas is supplied under pressure of 3.0-4.0 MPa to cluster site of the developed well and then to booster station to which process water is pumped at the same time. The obtained liquid-gas mixture is compressed to the value of 7.0-10.0 MPa. After that gas-liquid mixture is supplied to separator where gas-liquid mixture is separated into high pressure gas and liquid. Liquid is supplied to pump station, and high pressure gas is supplied to ejector to which there also supplied is foam-forming liquid - FFL. Aerated foam-forming liquid - AFFL obtained on ejector is supplied to flexible pipe - FP of coil tubing unit which is lowered to tube space of the well with stops in every 50-100 m. At each FP burial step the supply of FFL to ejector is stopped, and high pressure gas is supplied to FP by passing the ejector, forcing away damping liquid and AFFL to day surface and by performing well ventilation till gas influx is obtained from productive formation. After FP is buried to the depth of 200-300 m together with supply of AFFL thereto there supplied to after-tube space of the developed well is gas from GPF with pressure of 3.0-4.0 MPa. After gas influx is obtained, the well is developed till it is brought to process mode; after that FP is removed from well, and well is brought into operation.

EFFECT: reducing the time required for well development and providing influx from formation of gas well without packer in ALFP conditions with abnormal coefficient lower than 0,2.

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