BORE-HOLE JET DEVICE FOR FORMATION HYDRAULIC FRACTURING AND HORIZONTAL WELL EXAMINATION AND A METHOD FOR THE OPERATION THEREOF

摘要

The inventive device comprises a jet pump (2) and apacker (3). The body (4) of the pump (2) comprises a nozzle (5) andmixing chamber (6) with a diffuser (7), which are coaxially arrangedtherein, and a stepped through channel (8) which is made therein, tapersfrom the top downward and is provided with a seat (9) between the steps.The channel (8) is made coaxially with a pipe string (1) and is coupledthereto. Each of the channels (10, 11) for supplying pumped from thewell and active media is provided with a return valve (13, 14) and arestrictor (15, 16) for limiting the displacement of the locking member(17, 18) of the return valve (13, 14) upward with respect to the seat (19,20) thereof. A sealing unit (21) in the form of a hollow stepped bodywith a sealing element (22) can be arranged in the through channel (8).An axial channel (23) for passing a rigid logging cable (24) with a well-logginginstrument (25) is made in the sealing element (22). A guidingseparation bush (26) which is cantilever fitted by the top end thereofto the top part of the body (4) of the pump (2) is mounted above thechannel (8) axially thereto in the body (4) of the pump (2). Longitudinalslotted orifices (27) are made in the wall of the separation bush (26). Theinvention makes it possible to improve the reliability of the device andto optimise the sequence of operations during the well test.