METHOD OF AND PUMPING UNIT FOR LIFTING OF FORMATION FLUID Russian patent published in 2003 - IPC

FIELD: oil producing industry. SUBSTANCE: invention relates to recovery of liquids from wells of any depth using plunger suction device. Proposed method of lifting of formation fluid comes to lowering suction device with plunger and valve into tubing string mounted inside well casing string, building rarefaction in bottom-hole region by means of plunger, opening of valve filling of above-plunger space with fluid, closing of valve and lifting fluid in above-plunger space to surface. Provision is made for passage of fluid from bottom-hole region into tube space and above-plunger space and additionally from tube space into inner space of tubing string. Valve is force opened at initial moment of plunger lowering and is force closed at initial moment of plunger lifting. Well pumping unit contains casing string, tubing string, packer installed in bottom-hole region, suction device with plunger and valve, and pull member with drive. Plunger of suction deice is placed directly in tubing string. Valve is mounted in plunger groove. Channels are made in packer to connect bottomhole region with tube space. Channels made in plunger to connect underplunger space with undervalve space. Holes made in tubing string higher than packer connect tube space with inner space of tubing string. Pull member is directly coupled with valve and is made in form of flexible element passing over idler sheave mounted in bottom-hole region and is connected with drive. One run carries valve and the other is passed through port in packer. Tubing string is made of polymeric reinforced tubes, and plunger and valve are manufactured of polymeric reinforced materials. EFFECT: increased capacity. 4 cl, 2 dwg