A device and method for accurately determining the remaining oil storage position of an oil well

Abstract

The invention discloses a device and method for accurately measuring the position of a residual oil reservoir of an oil well. The device comprises a hydraulic system, a forward hydraulic pipeline, a reverse hydraulic pipeline, a measuring chamber, a pressure sensor, a sampling valve, a wire hole, a fluid resistivity meter, a sample pipeline and a sample transferring device. The device and method have the advantages that the measuring chamber of an instrument is used as a pumping chamber for pump in and out, continuous pumping in and out is changed into one-by-one pumping in and out, a complicated mechanical unit is omitted, true stratum samples can be obtained from most oil and gas wells, and the sampling speed is high; for a special complicated oil layer, the resistivity meter and the high-precision pressure meter are used so that underground fluid recognition can be achieved, the instruments are simple, and the reliability is improved; when the device is adopted by a well, by repeatedly going down to the well to obtain the true stratum fluid samples for testing, the accurate positions of the residual oil reservoirs of all perforation sections can be measured.

Description

technical field [0001] The invention relates to a device and technology for accurately measuring the remaining oil storage position of an oil well in the field of production logging. Background technique [0002] Oil wells, namely oil and gas production wells, cased wells. In the early, middle and late stages of its life, formation oil saturation logging or production profile logging is required. This is very important for oil and gas well management, water injection scheme design, oil and gas field development design and adjustment. [0003] Saturation logging refers to the measurement of formation oil saturation. In the cased hole, the logging series based on radioactive logging should be used, including carbon-oxygen ratio energy spectrum logging, neutron lifetime logging, and pulsed neutron-neutron logging. [0004] Carbon-to-oxygen ratio (C / O) energy spectrum logging, oil has high carbon content and water has high oxygen content, and the relative content of C and O a...

AI Technical Summary

Problems solved by technology

[0008] However, the current logging methods cannot accurately determine the depth from which the crude oil is stored in the formation, and the depth from which there is no oil, and all of them contain water

Because of this, the oil wells cannot be plugged properly, the water cut cannot be lowered, the crude oil production efficiency is extremely low, and the cost per ton of oil is extremely high

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