Identification method for fluid property of carbon dioxide intruded open oil-gas reservoir
An identification method and technology of carbon dioxide, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of increasing the difficulty of analyzing fluid properties, high operating costs, and limiting the number of samples to be sampled.
Active Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Regarding the study of the fluid properties of such oil and gas reservoirs, there are certain limitations in both wellhead sampling and bottom-hole sampling, especially in offshore deepwater oil fields, which further limits the number of sampling samples due to high operating costs, further increasing the difficulty of fluid property analysis
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Embodiment 1
[0065] 1) Samples were taken from 3 wells in the target reservoir, and 15 samples (8 gas samples and 7 oil samples) were obtained, and the component data of the obtained samples were normalized to obtain a set of gas sample molar compositions and a set of gas samples. The molar composition of the set oil sample is shown in Table 1.
[0066] Table 1 Molar compositions of gas and oil samples
[0067]
[0068] 2) Remove CO from the gas sample molar composition 2 After calculating the mole fraction of CO 2 The percentage content of each component in the gas sample is obtained to get CO removal 2 The molar composition of the gas sample, remove CO in the molar composition of the oil sample 2 After calculating the mole fraction of CO 2 The percentage content of each component in the oil sample was obtained to get CO removal 2 The molar composition of the oil sample, the results are shown in Table 2.
[0069] Table 2 to CO 2 The molar composition of gas and oil samples
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The invention provides a restoring method for fluid property of a carbon dioxide intruded open oil-gas reservoir, wherein the method comprises the steps of normalizing representative fluid components, and obtaining a gas sample molar composition and an oil sample molar composition; respectively calculating total molecular mole masses of the gas sample and the oil sample according to the gas sample molar composition and the oil sample molar composition; performing CO2 elimination calculation on the gas sample molar composition and the oil sample molar composition, and obtaining a CO2 eliminated gas sample molar composition and a CO2 eliminated oil sample molar composition; calculating the fluid total mass of a gas cap gas area and the fluid total mass of an oil area by means of an existing oil-gas reservoir parameter; calculating the total mole number of the gas cap gas area and the total mole number of the oil area before CO2 intrusion, and furthermore obtaining the mole number of each component of the gas cap gas area and the oil area after CO2 elimination; and finally calculating the fluid composition of the original oil-gas reservoir after fluid mixing of the gas cap gas area and the oil area. The identification method further comprises measuring the fluid density of the original oil-gas reservoir. The invention further provides an application of the identification method in representing change of the fluid property of the open oil-gas reservoir after carbon dioxide intrusion.
Description
technical field [0001] The invention relates to the field of hydrocarbon fluid property analysis, in particular to a fluid property identification method for carbon dioxide intrusion into open oil and gas reservoirs. Background technique [0002] The existing sampling methods for studying the properties of high-temperature and high-pressure fluids in oil and gas reservoirs include wellhead sampling and bottom-hole sampling, both of which have their own advantages and disadvantages. Most of them adopt the wellhead sampling method. The advantage of this method is that it is simple and easy to operate, and the cost is low. The disadvantage is that the composition of hydrocarbon samples is different from that under the conditions of oil and gas reservoirs because the wellhead pressure is lower than the reservoir pressure. Volatile oil or condensate gas is extremely sensitive to sampling pressure due to its near-saturation state, and some samples will be taken from the bottom hol...
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IPC IPC(8): E21B43/16E21B49/00
Inventor 陈志海姜凤光张玉来
Owner CHINA PETROLEUM & CHEM CORP