Study On The Test Technology And Well Test Analysis Method For Low Permeability Formation

Oil fields in eastern China continental sandstone reservoir of bay of annulus Bohai sea for low permeability and low permeability reservoir most do not have the flowing capacity of oil testing well. In recent years, with the gradual deepening of the exploration, low permeability reservoir of oil testing technology in production has been the dominant position, with well testing as the main body, a pipe column to complete a number of operations to become the well testing technology development direction.This paper summarized in low permeability reservoir geological features in general on the basis of the law, in the light of our country low permeability oil and gas reservoir percolation characteristic, established a low-velocity non-Darcy percolation equation, is obtained by considering starting pressure gradient testing analysis chart; for low permeability oil and gas reservoir without radial flow pressure data, put forward early stage small signal extraction and amplification technology in well test analysis, formed four kinds of typical curve, reduces the early chart curve fitting multiple solutions; in low permeability non flowing wells buildup pressure data, to establish a wellbore flow in vertical pipe flow equation and the DST stratum percolation equation, obtained by DST flow and restoration of joint analysis method, thus improving the well test data interpretation and the interpretation accuracy rate. At the same time, the" new DST pressure-controlled with select tester valve system" research, successfully developed to select tester valve key pressure control test system, the problem of the low permeability reservoir well testing long time open well annulus liquid discharge need to keep the pressure of the problem, ensuring low permeability reservoir test pressure well testing the normal shut in the well; the hydraulic jet pump technology research, achieved a positive, reverse discharging alternating operation, the formation of both the energy and the tubing and drill pipe matched with hydraulic jet pump supporting technology series, solves the low permeability reservoir oil and drill-stem testing liquid, capacity to implement difficult problem; in addition to sand, oil-water separation, metering, heating for the multifunctional metering device development, solve the low permeability reservoir in heavy oil well, sand well jet pump ground water treatment and other technical problems; and through the test string to optimize, form a set of suitable for the reservoir of low permeability well test process test string, thereby broadening formation testing and other downhole operations, such as perforation, acidification, fracturing, induced flow, cement squeeze work such as compatibility, better suited to the needs of long time of open well drainage in low permeability reservoir needs, Finally has formed a set of suitable for low permeability oil and gas reservoir test technology and test analysis method, through the field application effect.