DEVICE FOR FLUID LIFTING BY SUBMERSIBLE ELECTRICAL PUMP THROUGH CASING STRING Russian patent published in 2002 - IPC

FIELD: operation of wells; applicable in fluid pumping by electrical pump through casing string. SUBSTANCE: device has body 1 with upper and lower projections 2,3, respectively, and bypass channels 2 and coupling freely installed between body projections. Coupling is compound and includes rigidly connected between each other upper cylindrical and lower conical sections 6,7. Coupling has end seal 8 relative to upper projection 2. Secured to coupling is flexile collar 11. Supporting-stopping appliance of device has, at least, three slips 12 with single-side tooth cutting. Slips are uniformly located by means of recess connections 13 on lower conical section 7 of coupling. Installed between lower projection 3 and coupling is spacer in form of connection 14 with vertical slots 145 and washer 16 on its upper end. Spring 17 rests on washer 16, upper section of spring is located in bore 18. Run of spring 17 facilitates engagement of washer 16 with end of lower conical section 7 of coupling. Supporting-stopping appliance includes also ring 19 with leaf springs 20 rigidly secured to its internal surface. Springs 20 are located in slots 15 and recesses 21. Toothed slips 12 are hinged by tie rods 22 with ring 19. During short- time trial starting of electric pump 25, fluid enters zone located above collar 11, and under action of the latter of weight of fluid column, collar 11 together with coupling, overcoming force of spring 17, move down on stopping run. Slips 12 moving along recesses 13 engage with their teeth the walls of casing string 23 to provide for reliable stopping of device. EFFECT: extended field of application and increased operate reliability, and simplified operation. 3 cl, 1 dwg