FIELD: earth or rock drilling, particularly pump equipment.
SUBSTANCE: formation tester comprises jet pump installed on flexible smooth tube, as well as nozzle and mixing chamber provided with diffuser arranged in jet pump body. Jet pump body also has stepped through channel adapted to receive functional inserts, namely insert for formation pressure build-up curve recording in under-packer space and blocking insert. Blocking insert is fitted with check valve installed in central through channel thereof and circulation valve located in side wall of blocking insert. Mechanical or mechanical-hydraulic upper packer is arranged below jet pump on flexible smooth tube. Jet pump is installed in casing pipe above productive formations in the well. Lower packer formed as cup of elastic material with opened top and conical side wall is installed below upper one and is connected to flexible smooth tube. Cup bottom is secured to flexible smooth tube in air-tight manner. Centering ring for packer centering in casing pipe is located below lower packer and is connected to flexible smooth pipe. Autonomous logging assembly is installed at lower perforated end of flexible smooth tube. Distance L between packers is not less than outer diameter D of flexible smooth tube in area of lower packer installation. Method involves lowering jet pump connected to flexible smooth tube into well along with recording background physical properties of well bore zones in productive formation with the use of autonomous recording assembly; removing upper packer when predetermined depth is reached; injecting acid solution or breakdown fluid in productive formation through perforated end of flexible smooth tube; injecting working fluid in flexible smooth tube through hole annuity and recirculated line to flush blocking insert out of the stepped through channel to ground surface; installing functional insert in above channel to record formation pressure build-up curve in under-packer space; injecting working liquid in jet pump nozzle; creating differential pressure drawdown in under-packer space; extracting reaction products or breakdown fluid from productive formation; measuring well outputs at 2-3 differential pressure drawdown values; rapidly stopping working liquid supply to jet pump nozzle and recording formation pressure build-up curve in under-packer space with the use of autonomous logging assembly; removing upper packer; repeatedly injecting working liquid to jet pump nozzle to remove lower packer; lifting flexible smooth tube and equipment during jet pump operation along with recording physical rock fields along well hole in productive formation area and stopping working liquid supply to jet pump nozzle, i.e. removing lower packer after productive formation zone passing; lifting flexible smooth tube and equipment to ground surface.
EFFECT: intensification of cased or open-hole well survey and test operations.
5 cl, 2 dwg
