Determining method of gas suction proportions of gas suction sections of gas injection well

Abstract

The invention provides a determining method of the gas suction proportions of the gas suction sections of a gas injection well. The determining method comprises the steps that the current temperaturesand current pressure of all formation depths in a target well are obtained; the current molar volume of gas at all the formation depths is determined based on the current temperatures and the currentpressure of all the formation depths; based on the current molar volume of the gas at all the formation depths, the non-gas-suction theoretical pressure of all the formation depths is determined whenthe wellhead pressure of the target well is P0; and the gas suction proportions of all the formation depths are determined based on the current pressure and the non-gas-suction theoretical pressure of all the formation depths. According to the determining method of the gas suction proportions of the gas suction sections of the gas injection well, flow testing of downhole gas is converted into high-precision temperature and pressure testing, and the influence of complex factors during gas flow testing is avoided.

Description

technical field [0001] The invention relates to a method for determining the gas-suction ratio of the gas-suction profile of a gas injection well, and belongs to the technical field of downhole testing in oil fields. Background technique [0002] With the deepening of oilfield development, non-hydrocarbon gas injection development technology has gradually been applied on a large scale, and more and more development measures such as downhole injection of air, oxygen-reduced air, and nitrogen have been applied. In downhole gas flow testing in oilfields, turbine flowmeters are usually used for steam flow testing, but the flow measurement lower limit of the range is relatively high and the resolution is high, which cannot meet the requirements of small displacement non-hydrocarbon gas injection profile testing. Aiming at the flow test of non-hydrocarbon gas, there are methods and instruments using thermal mass flowmeter for testing. The test effect of small flow gas is better th...

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Problems solved by technology

In downhole gas flow testing in oil fields, turbine flowmeters are usually used for steam flow testing, but the flow measurement lower limit of the range is relatively high and the resolution is high, which cannot meet the needs of small-displacement non-hydrocarbon gas injection profile testing.

Aiming at the flow test of non-hydrocarbon gas, there are methods and instruments using thermal mass flowmeter for testing. The test effect of small flow gas is better than that of turbine flowmeter, but the measurement probe of this type of instrument is easily contaminated by impurities such as downhole oil. The measurement data is abnormally large, and the test data cannot be interpreted, etc.

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