Superficial layer heavy oil reservoir single-phase flow screw pump lifting prejudgment method

Abstract

The present invention discloses a superficial layer heavy oil reservoir single-phase flow screw pump lifting prejudgment method. The method comprises the following steps: selecting an oil well with a suitable depth for production of a screw pump, determining relevant parameters of the produced and developed oil reservoir oil well, determining the lift and the lifting speed of the screw pump, and calculating the gravity pressure loss; performing subsection calculation of the oil well, and performing subsection iteration calculation of the frictional resistance loss of each section; performing summation of the frictional resistance loss of each section to obtain a total frictional resistance loss, and performing summation of the total frictional resistance loss and the gravity pressure loss to obtain a linear loss, comparing the linear loss with the lift of the screw pump obtained in the step 2, if the linear loss is larger than the lift of the screw pump, allowing the screw pump not to be lifted; and or else, lifting the screw pump. The superficial layer heavy oil reservoir single-phase flow screw pump lifting prejudgment method is a method for determining whether the screw pump is lifted or not aiming at the superficial layer heavy oil reservoir with high crude oil viscosity and free from gas and water so as to give a certain guide for the determination of whether the screw pump is employed for production and development of the field superficial layer heavy oil or not.

Description

technical field [0001] The invention relates to a method for predicting the lift of a single-phase flow screw pump in a shallow heavy oil reservoir, and belongs to the technical field of oil field exploitation. Background technique [0002] For the production and development of shallow heavy oil reservoirs, the self-flowing ability of oil wells is limited, and mechanical pumping and other means are commonly used. In the application of various mechanical pumps, due to its excellent performance-high pump efficiency, simple ground equipment, no pollution, low noise, wide range of crude oil viscosity and easy operation, etc., the screw pump is widely used for shallow oil pumping. Tibetan production development. The superior performance of the screw pump also leads to certain restrictions on its applicable conditions. Generally, the crude oil viscosity range that the screw pump can lift is less than 8000mPa·s, and the head range is generally within 1800m. Although there are als...

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Problems solved by technology

The superior performance of the screw pump also leads to certain restrictions on its applicable conditions.

Generally, the viscosity range of the crude oil that the screw pump can lift is less than 8000mPa s, and the head range is generally within 1800m. Although there are screw pumps for ultra-deep wells at this stage, their promotion is relatively small.

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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