METHOD OF BOREHOLE AND WELLHEAD EQUIPMENT LAYOUT FOR WELL SURVEY ENVISAGING INJECTION OF INJECTION FLUID TO FORMATION AND EXTRACTION OF FLUIDS FROM FORMATION Russian patent published in 2014 - IPC E21B47/00 E21B43/00 E21B33/03 

FIELD: oil and gas industry.

SUBSTANCE: invention suggests the method of borehole and wellhead equipment layout for well survey envisaging injection of injection fluid to the formation and extraction of fluids from the formation, which includes running in of a flow string to the well with a jet pump or a circulation valve intended for compressor operation with isolation of the flow string and annular space. At that the tubing shoe is run in up to the level of upper perforation holes or as much as closer to it. The packer is set at distance of 20 metres at most from the tubing shoe, over the packer or as close as possible to it at one of the flow string pipes one or two circulation valves or a jet pump and a mandrel below them with one or two remote (permanent) pressure and temperature quartz sensors for tubular and annular space. The well head is equipped with a packaging arrangement consisting of a lubricator, two wellhead pressure and temperature sensors to control buffer and annular parameters, a choke chamber with an adjustable choke, a multiphase flow meter, a sampler allowing oil, water and gas sampling in conditions of the well operation, a discharge unit comprising two angled bends and two choke chambers. Connection of a feeder is envisaged for pumping of injection fluid or delivery of working agent from a tank to the buffer line or annular space. The line from the feeder is equipped with a branch pipe via the choke chamber with the adjustable choke back to the tank; a flow meter is mounted in the line from the feeder to the well downstream the branch line in order to control volume of the fluid fed to the well. In order to increase reliability of pressure and temperature measurement one or two self-contained or remote pressure and temperature sensors are mounted under the packer. In order to increase accuracy of phase debit measurement in the formation flow at the flow string over the packer or below it a downhole multiphase flow meter is mounted with functions of continuous monitoring of phase consumption as well as function of downhole pressure and temperature measurement.

EFFECT: for the purpose of direct and back circulation in the well bore a direct and return circulation valves are included into composition of the downhole assembly.

4 cl, 2 dwg