Patent ID: 8397808

Claim:
A bore-hole jet device for formation hydrofracturing and surveying horizontal wells, comprising a jet pump and a packer, which are arranged on a pipe string, an active nozzle and a mixing chamber with a diffuser being coaxially arranged in a body of the jet pump, the jet pump body being also provided with a stepped pass channel narrowing from top downwards and having a seat between the steps of the stepped pass channel, a channel for supplying a fluid pumped out of a well in communication with the stepped pass channel below the seat, and a channel for supplying an active working medium in communication on an outlet side with the active nozzle and on an inlet side with a hole annulus around the pipe string, the stepped pass channel being made coaxially to the pipe string and communicating with it, the channel for supplying a fluid pumped out of a well and the channel for supplying an active working medium being each provided with a check valve and with a limit stop for a shutoff member of the check valve, when each check valve member moves upward to a respective seat of the respective check valve, the stepped pass channel being made with the possibility of installing a sealing unit made as a hollow stepped cylindrical housing covering a sealing element, the sealing element being provided with an axial channel for passing a rigid logging cable therethrough, on which a logging instrument is suspended via a cable head below the jet pump body, a cylindrical guide separation bushing is arranged above the stepped pass channel and coaxially to it in the jet pump body, the bushing being cantilever-attached by its top end to the top portion of the jet pump body with the use of a threaded connection, longitudinal slit-like openings are made in the wall of the guide separation bushing, the lower free end of the guide separation bushing being spaced from the upper end of the stepped pass channel at a distance S equal to 0.05-0.2 diameters D 1 of the upper end of the stepped pass channel, the inner diameter d of the guide separation bushing being equal to 1.05 to 1.2 diameters D 1 of the upper end of the stepped pass channel, and the width h of the slit-like openings in the guide separation bushing being not greater than the distance H between the adjacent slit-like openings, the diameter D 2 of the pass channel below the seat being in the range from 0.90 to 0.96 of the diameter D 1 of the upper end of the stepped pass channel, and the diameter D 3 of the rigid logging cable being in the range from 0.2 to 0.7 of the diameter D 1 of the upper end of the stepped pass channel.