FIELD: engines and pumps; mining art.
SUBSTANCE: unit incorporates a jet pump (JP) mounted on the string and a packer. JP housing has a stepwise through channel (STC) with a mounting seat arranged between the steps and pumped-out well medium feed channels. The STC is arranged aligned with the string and communicates with it, while the aforesaid feed channels are provided with check valves and the valve shut-off element up-travel limiters. The STC can incorporate a sealing assembly in the form of a casing with a sealing element and a logging cable channel. A cylinder guide bush-separator (BS) is arranged above the STC and aligned with it in the JP housing, the aforesaid BS being fastened by its top end as a cantilever at the JP housing upper part. The BS walls are provided with lengthwise slot-like holes. The BS lower free end is arranged at a certain distance from the STC upper end face. The BS inner diameter, the STC upper end face diameter, the BS slot-like holes widths and the distances between adjacent slot-like holes are intercorrelated.
EFFECT: higher reliability and efficiency of the unit in testing the well and optimisation of testing procedures.
2 dwg
