A dynamic reserve calculation method for offshore abnormally high pressure gas reservoirs
A technology of dynamic reserves and calculation methods, which is applied in the fields of earthwork drilling and production, design optimization/simulation, wellbore/well components, etc. It can solve the problem of inability to grasp the initiative of gas field development, inability to accurately grasp gas field development dynamics, and difficulty in gas field development adjustment. and other problems to achieve the effect of strong operability
Active Publication Date: 2021-07-27
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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Problems solved by technology
At present, a set of methods for accurately calculating the dynamic reserves of offshore abnormally high-pressure gas reservoirs has not been formed, so it is impossible to accurately grasp the development status of gas fields, which makes it difficult to adjust the development of gas fields, and cannot grasp the initiative of gas field development
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[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0028] The present invention provides a method for calculating dynamic reserves of offshore abnormally high-pressure gas reservoirs, comprising the following steps:
[0029] 1) Determine the virtual geological reserves of the target abnormally high-pressure gas reservoir.
[0030] Applying the material balance method, if there is a constant-volume sealed gas reservoir with normal pressure, and its original formation pressure is the same as that of the abnormally high-pressure gas reservoir, after it is put into production, the apparent formation pressure p / Z and cumulative gas production G p The linear variation relationship of is completely consistent with the abnormally high pressure gas reservoir, such as figure 1 Shown in the first straight line segment I. Then, according to the gas production and pressure data in the early stage of the developm...
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The present invention relates to a method for calculating the dynamic reserves of offshore abnormally high-pressure gas reservoirs, comprising the steps of: 1) determining the target abnormality through the pressure drop equation of the closed gas reservoir at constant volume at normal pressure according to the gas production and pressure data in the early stage of the development of the target abnormally high-pressure gas reservoir The virtual geological reserves of high-pressure gas reservoirs; 2) Calculate the effective compressibility coefficient of the target abnormal high-pressure gas reservoir according to the effective compressibility coefficient calculation model; 3) Calculate the accuracy of the effective compressibility coefficient of the target abnormal When the coefficient is greater than 0.9, determine the effective compressibility coefficient of the target abnormally high-pressure gas reservoir; otherwise, return to step 2); 4) Calculate the dynamic reserves of the target abnormally high-pressure gas reservoir according to the dynamic reserve prediction model of the abnormally high-pressure gas reservoir. The method of the present invention predicts dynamic reserves based on early production data of abnormally high-pressure gas reservoirs, only needs production and pressure data, is quantified, has strong operability, and provides a key technical means for calculating dynamic reserves of offshore abnormally high-pressure gas fields.
Description
technical field [0001] The invention relates to a method for calculating the dynamic reserves of an abnormally high-pressure gas reservoir in the early stage of development, in particular to a method for calculating the dynamic reserves of an offshore abnormally high-pressure gas reservoir. Background technique [0002] From the experience of developed gas fields at home and abroad, it can be seen that when offshore abnormally high-pressure gas fields are in the early stage of development, the dynamic reserves calculated based on early production data are too large; difficulty. At present, a set of methods for accurately calculating the dynamic reserves of offshore abnormally high-pressure gas reservoirs has not been formed, so it is impossible to accurately grasp the development status of gas fields, which makes it difficult to adjust the development of gas fields, and it is impossible to grasp the initiative of gas field development. Contents of the invention [0003] I...
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IPC IPC(8): E21B49/08G06F30/20
CPCE21B49/087G06F30/20
Inventor 王帅胡光义谭先红朱国金张利军田虓丰吴昊孙依依张慧范虎
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD