Patent RU-2241864-C1 (RU)
Inventor: KHOMINETS ZINOVIJ DMITRIEVICH
IPC: F04F5/54
Filed: 2003-05-15
Granted: 2004-12-10
Abstract: FIELD: oil producing industry; pumping facilities. 
     SUBSTANCE: according to proposed method jet pump with stepped through channel in its housing is lowered into well tubing string together with packer with through channel arranged lower than jet pump , and self-contained logging complex mounted on lower end of tubing string. In process of lowering self-contained logging complex into open hole, background values of physical parameters of bottom hole formation zone are recorded and when preset depth is reached, releasing of packer is carried out and packer is set higher than formations to be tested. Functional insert is lowered on logging cable or wire along tubing and is set in through channel to record curves of pressure built up in underpacker space. Said insert is furnished with bypass valve and check valve installed lower than insert and self-contained pressure gauge. Liquid working medium is delivered into nozzle of jet pump to build number of differential pressures in well underpacker space, and well production rate is measured at each differential pressure value. Then delivery of liquid working medium into jet pump nozzle is sharply stopped with disconnection of overpacker space of well from underpacker space by means of check valve, and, using self-contained pressure gauge, building up of formation pressure in underpacker space of well is recorded with transmission of information from underpacker space of well to surface along logging cable. Then liquid working medium is delivered into jet pump nozzle to build up pressure on producing formation, and physical parameters in bottom hole formation zone of producing formation are measured by self-contained logging complex. Then bypass valve in insert is open by pulling logging cable or with to set underpacker and overpacker spaces in communication and equalizing pressure between then. Then functional insert is taken out for recording curves of pressure built up, packer is removed and tubing string with jet pump, packer and self-contained logging complex is lifted. In process of lifting, logging complex is used to record physical parameters of bottom hole formation zone in intervals of location of producing formations and near them. Well jet unit gas tubing string-mounted packer, jet pump with nozzle and mixing chamber with diffuser installed in housing, and stepped through channel is made, and functional insert to record curves of pressure build up with self-contained pressure. Self-contained logging complex for measuring physical values is installed on tubing string lower than packer. Jet pump is installed over well formations at distance h equal to   where h is vertical component of distance from jet pump to formation foot;   is formation pressure  ;   is maximum tolerable pressure differential in formation,  ; g is free fall acceleration,  ;   is density of liquid in well,  . Jet pump is made with following relationship of sizes: ratio of diameter of inlet section of mixing chamber   to diameter of outlet section of nozzle   is form 1.1 to 2.4; ratio of length of mixing chamber   to diameter of inlet section of mixing chamber   is form3 to 7; ratio of length of nozzle   to diameter of its outlet section  $$$ id form 1 to 8; distance L from outlet section of nozzle to inlet section of mixing chamber is form 0.3 to 2 diameters of outlet section of nozzle  ; angle   to tilting of diffuser generatrix to longitudinal axis of diffuser is form 4 o  to 14 o . Thanks to it intensification of researching and testing of open hole wells is provided, first of all wells with curved open holes, and optimization of arrangement and dimensions of jet pump operating together with self-contained logging complex is ensured. 
     EFFECT: improved reliability of well jet unit in operation. 
     3 cl, 3 dwg