A method for calculating cumulative water injection based on changes in water-flooded layer saturation
A saturation and water injection technology, used in climate change adaptation, earthwork drilling, complex mathematical operations, etc., can solve problems such as large errors in cumulative water injection in water-flooded layers, inability to represent reservoir water production rate, and calculation process defects. , to achieve the effect of good promotion value and economic benefits
Active Publication Date: 2022-08-05
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0075] Based on the data of the Erdoz Basin's Jing'an Oilfield Long 6th Rock Heart Seeping and Water Dedication resistivity experimental data, the method of accumulating water injection is calculated using the method of the present invention. Experimental rock heart comes from 6 floors in the X area of Jing'an Oilfield in the Ordos Basin, with a sample depth of 1703.8m, the granular grain size is fine sandstone, the pore type is mainly grain pores, the pore degree is 13.57 %, the water saturation is 43.11 %, which is low pores and low. Emile storage layer. When the water -driven oil experiment, the rock heart after washing the oil after washing the salt was washed with a concentration of 85000mg / L CACL 2 The solution is saturated, and then the viscosity is 1.96MPA · S simulation the crude oil drive to the constant water state, and then began to use NA with mineralization to 620mg / L 2 So 4 The water solution is driven to the remaining oil state. In the process of water drive, mea...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The present invention proposes a method of accumulating water injection based on water flood -based saturation changes. This method divides the cumulative calculation of water injection according to the different stages of the oil layer water injection. It is divided into three calculation methods.The volume reservoir injection water is a function of water saturation change. When the oil layer oil and water come out, the change of water saturation is considered comprehensively.This method is of great significance for the accurate calculation of the water flooding hybrid fluid resistance and remaining oil saturation. It provides a scientific basis for adjusting the adjustment of the old oil zone development plan, controlling water -controlling oil, and old well digging.Essence
Description
【Technical Field】 [0001] The present invention belongs to the field of oilfield development technology, which involves a method of accumulating water injection based on water flood -based saturation changes. 【Background technique】 [0002] At present, many oilfields use water injection development methods. After many years of water injection, some oils have entered the stage of high water content. The water flooding layer recognition is of great significance to stabilize oil control. The difficulty of the water saturation calculation of the water flooding layer is the calculation of the hybrid fluid resistivity in the reservoir. The cumulative water injection volume is a key parameter for the calculation of the water flooding hybrid fluid resistivity. At present, the material balance method is usually used when the accumulation of water injection is calculated. The basic principle of the material balance method is that when the unit volume water flooding layer is saturated at a c...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
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