Method for predicting the lifting of two-phase flow screw pump of shallow-layer heavy oil reservoir

Abstract

The invention discloses a method for predicting the lifting of two-phase flow screw pump of a shallow-layer heavy oil reservoir. The method comprises the following steps: selecting an oil well in a proper depth for screw pump production; determining the relevant parameters for the produced and developed oil well of the oil reservoir; according to the depth of the oil reservoir, determining the delivery lift of the screw pump; determining the lifting speed on the basis of the daily production amount; calculating the oil well in sections; performing iterative calculations in sections for the friction resistance loss of each section; summing up the general friction resistance loss and the gravity pressure loss to obtain the linear loss; comparing the linear loss with the delivery lift of the screw pump obtained from the step 2; if the linear loss is greater than the delivery lift, then indicating that the screw pump cannot lift; and otherwise, using the screw pump to lift. The method is designed as a method to predict whether a screw pump is used to lift for production or not for a shallow-layer heavy oil reservoir containing high-viscosity crude oil, gas, and water and provides certain guidance on whether to use a screw pump to produce and develop shallow-layer heavy oil.

Description

technical field [0001] The invention relates to a method for predicting the lifting of a two-phase flow screw pump in a shallow heavy oil reservoir, and belongs to the technical field of oilfield exploitation. Background technique [0002] During the production and development of shallow heavy oil reservoirs, when crude oil flows into the crude oil near the well, due to the drop in formation pressure, the crude oil begins to degas in large quantities, and the viscosity of crude oil begins to rise; resulting in insufficient formation energy to lift crude oil to the wellhead, such Under such circumstances, pumps are usually used to pump crude oil. Excellent performance advantages of screw pump: high pump efficiency, saving investment, simple ground equipment, no pollution, low noise, wide range of crude oil viscosity, convenient operation, etc. limits. Generally, the crude oil viscosity range that the screw pump can lift is lower than 8000mPa·s, which is also the limit value...

AI Technical Summary

Problems solved by technology

Excellent performance advantages of screw pump: high pump efficiency, saving investment, simple ground equipment, no pollution, low noise, wide range of crude oil viscosity, convenient operation, etc. limits

Generally, the crude oil viscosity range that the screw pump can lift is lower than 8000mPa·s, which is also the limit value that the screw pump itself can lift, but this is not the case in actual situations. Due to the influence of some external factors, the screw pump Lifting crude oil viscosity is less than 8000mPa·s

[0003] When lifting heavy oil for a well, if the lift pump cannot be selected correctly, the workload will increase invisibly; if the screw pump is selected, the overload may damage the screw pump, resulting in economic losses for the oil field unit.

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