Correlated flux injection section test method and construction technique

Abstract

A method is used for measuring flow injected into a section. A tracer with polymerization characteristic is released into the oil pipe of a flooding well. A part of the tracer goes through a water faucet, flows into the ring space of an oil sleeve and enters an injection layer when passing by an eccentric distributor. When the tracer is released into the oil sleeve, an instrument with two detectors should be placed at a position through which the tracer flows. When the tracer flows through two detectors in the ring space of the oil sleeve, a reciprocal change signal will be measured by the upper and the lower detectors. The other part of the tracer continues to flow down in the oil tube and the change signal is also measured by the upper and the lower detectors. Two wave crests appear on a well log. Owing to the good polymerization characteristic of the tracer, minor fluid state change combined, the small area of the ring space of the oil tube, short going-through time and the narrow width of the crest, the inner crest value of the oil tube and the crest value of the ring space of the oil sleeve can be determined. As the inner crest value of the oil tube is removed, the time when the tracer goes through the upper and the lower detectors can be worked out. Because the section of flow speed is known, the monolayer injection flow can be worked out according to an arithmetic mode.

Description

1. Technical field [0001] The invention relates to a correlation flow injection profile testing method and a construction process for layered measurement of oil field distribution injection wells by using a radioactive correlation measurement method. 2. Background technology [0002] In the field of injection profile logging, the main logging methods for measuring injection wells are turbine flowmeter, electromagnetic flowmeter, ultrasonic flowmeter, target flowmeter, isotope tracer logging and neutron oxygen activation logging. Among them, the first four logging methods are mainly used for the measurement of general injection wells (excluding the situation where there is a water-absorbing layer at the upper part of the bell mouth). At present, the most widely used of these methods is the electromagnetic flowmeter, which has a wide measurement range. Range and high measurement accuracy, the measurement lower limit can reach 1m 3 / d. The remaining three methods also have hi...

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Problems solved by technology

Isotope tracer logging is widely used, but with the development of oilfields, due to long-term erosion by water bodies, large pores are formed in the formation part of the well, and when the isotope tracer arrives, it directly enters the deep formation, making the isotope tracer The abnormal display of the tracking log curve is weakened, causing interpretation errors

In addition, this method is also affected by deep penetration perforation, fracturing, contamination, channeling, leakage, and fluid viscosity of polymer injection wells, which will also greatly affect the accuracy of logging results, so for this part of wells However, isotope tracer logging can no longer meet the needs of injection profile logging

Neutron oxygen activation logging is a new logging method recently developed. This method can accurately measure the layered water injection volume outside the tubing, and has been widely used in oil fields. However, the lower limit of this method is relatively low. high (10m 3 / d or so), and the test cost is high, so its application scale is limited to a certain extent

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