A Prediction Method of Reservoir Index in the Process of High Salt Reservoir Development
A technology of reservoir development and prediction method, applied in the field of reservoir development, can solve problems affecting reservoir development effect and reservoir permeability decline
Active Publication Date: 2021-05-11
CHINA NAT OFFSHORE OIL CORP +1
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[0003] During the development of such reservoirs, with the decrease of formation pressure and the increase of water content, salt precipitation will occur in near-wellbore reservoirs and inside the wellbore, which will lead to a gradual decrease in reservoir permeability and affect such Reservoir development effect
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[0012] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0013] The present invention proposes a method for predicting reservoir indicators during the development of high-salt reservoirs, comprising the following steps:
[0014] 1) Use one-dimensional core displacement experiments to obtain the permeability loss rate and permeability retention rate chart of the target oilfield under different formation water salinity, different core permeability, different formation pressure, and different water saturation, and obtain the salt Analysis of the timing of emergence. The specific process is as follows:
[0015] ① Select the experimental conditions for the water flooding experiment. The first experimental condition is the formation pressure simulated by the experiment, and the second experimental condition is the salinity of the injected water. The selected experimental conditions are as follows: set the format...
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The invention relates to a method for predicting reservoir indexes during the development of high-salt reservoirs. Permeability loss rate and permeability retention rate charts under different pressures and water saturation conditions, and obtain the timing of salt precipitation; 2) Use numerical simulation methods and apply actual geological models to simulate injection of formation water into target formations for development, Obtain the distribution of formation pressure and water saturation near the production well during the development process; 3) Based on the distribution of formation pressure and water saturation near the production well obtained in step 2), combined with the distribution obtained in step 1) The relationship between the timing of salting out in the reservoir and the distribution of formation pressure and water saturation, restart the digital model after salting out in the reservoir, modify the permeability of the salting out area; continuously modify the permeability of the reservoir and range.
Description
technical field [0001] The invention relates to a method for predicting reservoir indicators during the development of high-salt reservoirs, belonging to the technical field of reservoir development. Background technique [0002] With the continuous development of exploration and development technology, more and more high-salt oil reservoirs have been gradually discovered. The reservoir fluid properties of such oil reservoirs are better, but the salinity of formation water is higher (generally as high as 200,000mg / L or more). At present, such high-salt reservoirs have low oil recovery rate and low recovery degree, and have great mining potential. Therefore, in the development process of such reservoirs, it is necessary to select a reasonable development method according to the seepage characteristics and laws in the reservoir development process, so as to effectively improve the development effect of such reservoirs. [0003] During the development of such reservoirs, with ...
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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 李南朱国金谭先红袁忠超田虓丰刘新光彭世强吴昊贾振王帅杨依依
Owner CHINA NAT OFFSHORE OIL CORP