Method and device for determining reasonable productivity of oil reservoir well, electronic equipment and medium

Abstract

The invention discloses an oil reservoir oil well reasonable productivity determination method and device, electronic equipment and a medium. The method comprises the following steps: respectively establishing flowing bottomhole pressure and static pressure equations, and predicting flowing bottomhole pressure and static pressure; calculating well bottom production pressure difference, and establishing a relation curve between the oil well yield and the well bottom production pressure difference; according to the relation curve, flow type classification is conducted on the single well; and reasonable productivity determination is carried out for different types of single wells. The method for determining the reasonable productivity of the oil well is provided for different flow types by dividing the flow types of the oil well of the ultra-deep fault solution reservoir, and the method has certain guiding significance for researching the reasonable productivity of the oil well of the same kind of oil reservoirs.

Description

technical field [0001] The present invention relates to the field of oil reservoir engineering, more specifically, to a method, device, electronic equipment and medium for determining the reasonable production capacity of an oil well in an oil reservoir. Background technique [0002] Productivity refers to the production capacity of an oil well, and production refers to the amount of crude oil produced by an oil well. Oil well productivity is the main basis for oilfield investment and decision-making. The main purpose of studying the reasonable productivity of oil wells is to maintain the production at a faster rate of oil recovery under high oil recovery and recover the investment as soon as possible. In the process of oil field development, oil nozzle is controlled as the main means of productivity control. Enlarging the nozzle and reducing the production pressure difference at the bottom of the well can increase the productivity of the oil well within a certain pressure d...

AI Technical Summary

Problems solved by technology

Advantages of the method: it can take into account the development of reservoirs and the actual flow capacity of fluids, and is applicable to various types of reservoirs, especially for strongly heterogeneous reservoirs and unconventional reservoirs. Testing the actual liquid supply capacity of the reservoir can better understand the actual production situation of the oil well, and determine the reasonable production capacity of the oil well based on this. Changing the size of the nozzle generally takes about 7 days to stabilize

However, for ultra-deep fault-karst reservoirs, because the vertical permeability of the breccia zone (core) is significantly higher than that of the plane, the permeability of the fracture zone (wing) is generally lower than that of the breccia zone (core), and fluid flow The vertical flow is dominant, and the lateral flow is supplemented; the vertical flow range is large, and the fluid starts to flow to the bottom of the well from several hundred meters below the bottom of the well; Non-linear, high-speed non-linear and other types of flow, the flow law is very complicated, does not conform to Darcy's law, that is, the productivity index is no longer a fixed value, and the production of oil wells cannot be allocated according to the formula q=JΔp;

[0011] Second, the differentiated pressure propagation law leads to the processing and interpretation method of the system well test to be improved

However, for ultra-deep fault-karst reservoirs, firstly, the production layer is not fixed, and the initial static pressure is not a fixed value, but depends on the propagation range of the pressure wave; Mainly, supplemented by lateral propagation, after the pressure wave reaches the wings, it continues to propagate downward until it encounters a closed formation vertically, that is, the pressure propagation law of ultra-deep fault-karst reservoirs is significantly different from that of conventional clastic reservoirs, so , there are no theoretical formulas and mature methods that can be used for reference in calculating the production pressure difference of fault-karst reservoirs, and can only rely on field measurements;

[0012] Finally, due to the deep burial of the oil field, the completed vertical depth of the oil well exceeds 7000m, which belongs to the ultra-deep well. At present, the system well test pressure gauge cannot be lowered to the bottom of the well.

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