Method for calculating accumulated water injection amount based on water flooded layer saturation change
A technology of saturation and water injection volume, which is applied in the fields of climate change adaptation, earthwork drilling and production, complex mathematical operations, etc., and can solve problems such as large errors in accumulated water injection volume in water-flooded layers, inability to represent reservoir water production rate, and defects in calculation processes, etc. , to achieve the effect of good promotion value and economic benefits
Active Publication Date: 2020-08-28
BC P INC CHINA NAT PETROLEUM CORP +1
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[0014] However, there are defects in the above calculation process. The denominator of the fraction on the right side of Equation (2) is the cumulative injection volume, that is, the w Cumulative fluid production, the numerator is the cumulative water production, and the right side of formula (2) cannot represent the saturation S w When the reservoir water production rate, but the cumulative water production from the beginning of reservoir water production is (K-1) φ(S w -S wi ) The average water production rate during this period of time
F in formula (3) w That is not S w function, therefore, the cumulative water injection in the water-flooded zone obtained through (3) has a large error from the actual
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[0075] Based on the experimental data of relative permeability and water flooding oil resistivity of Chang 6 core in Jing'an Oilfield, Ordos Basin, the accumulated water injection volume is calculated by using the method of the present invention. The experimental core comes from the Chang 6 layer in the X area of Jing'an Oilfield in the Ordos Basin. The sample depth is 1703.8m. The rock particle size is fine sandstone, and the pore type is mainly intergranular pores. seepage reservoir. In the water flooding experiment, the core after washing oil and salt was firstly treated with CaCl with a concentration of 85000mg / l 2 The solution was saturated, and then the crude oil with a viscosity of 1.96mPa·s was used to simulate the flooding to the state of bound water, and then the Na with a salinity of 620mg / L 2 SO 4 The aqueous solution is displaced to a residual oil state. During the water flooding process, water saturation and core resistivity were measured at different floodi...
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The invention provides a method for calculating accumulated water injection amount based on the water flooded layer saturation change. According to the method, the accumulated water injection amount calculation is divided into three calculation methods according to different stages of oil layer water injection; when the oil layer only produces oil, the unit volume reservoir water injection amountis the function of the water saturation change; and when the oil layer produces oil and water at the same time, the water saturation change is comprehensively considered. The method is of great significance in accurate calculation of the water-flooded layer mixed liquid electrical resistivity and remaining oil saturation, provides a scientific basis for adjustment of a development scheme in oil areas, water-cut control and production stabilization and potential excavation in old wells and has great popularization value and economic benefits.
Description
【Technical field】 [0001] The invention belongs to the technical field of oilfield development, and in particular relates to a method for calculating cumulative water injection volume based on changes in saturation of water-flooded layers. 【Background technique】 [0002] At present, many oil fields have adopted the water injection development method. After years of water injection, some oil reservoirs have entered the medium-high water cut stage. The identification of water-flooded layers is of great significance for oil stabilization and water control. The difficulty in calculating the water saturation of the water-flooded zone is the calculation of the resistivity of the mixed fluid in the reservoir. The cumulative water injection volume is a key parameter for the calculation of the mixed fluid resistivity of the water-flooded zone. The current literature usually uses the material balance method to calculate the cumulative water injection volume. The basic principle of the ...
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IPC IPC(8): E21B43/20E21B49/00G06F17/15
CPCE21B43/20E21B49/00G06F17/15Y02A10/40
Inventor 刘行军赵保华王自亮文晓峰井素娟曹孟鑫吴建华张伟杰
Owner BC P INC CHINA NAT PETROLEUM CORP