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A Judgment Method of Chemical Viscosity Reduction Auxiliary Screw Pump Lifting Heavy Oil Technology

An auxiliary screw, chemical viscosity reduction technology, applied in construction and other directions, can solve the problems of lack of judgment means, occupying pump volume and other problems, and achieve the effect of reducing trial production losses

Active Publication Date: 2019-08-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(6) Suitable for high gas content wells - the screw pump will not be gas-locked, so it is more suitable for oil and gas mixed transportation, but the free gas at the inlet of the downhole pump will occupy a certain pump volume
However, there is a lack of relevant judgment means, and tentative production and mining will bring a huge economic burden. Therefore, a set of methods is needed to judge whether the viscosity value of crude oil at the bottom of the well can meet the upper limit of the screw pump inlet, and then correctly guide the oil field to carry out the screw pump. production development

Method used

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  • A Judgment Method of Chemical Viscosity Reduction Auxiliary Screw Pump Lifting Heavy Oil Technology
  • A Judgment Method of Chemical Viscosity Reduction Auxiliary Screw Pump Lifting Heavy Oil Technology
  • A Judgment Method of Chemical Viscosity Reduction Auxiliary Screw Pump Lifting Heavy Oil Technology

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Take a well in Xinjiang Oilfield as an example to judge the ability of the screw pump to lift crude oil. The oil well only produces oil, but does not produce gas or water;

[0060] S100. Determine the relevant parameters of the oil reservoir and oil well of the well as shown in Table 2; the back pressure of the wellhead is 0.5MPA;

[0061] Table 2

[0062]

[0063] S200, daily output 3m 3 / d can determine that the lifting speed is 0.0176m / s, and the depth of the reservoir can determine that the head of the screw pump is 15.50MPA;

[0064] S300, measure the viscosity-temperature curve of the oil reservoir on-site by the viscosity of crude oil under formation conditions (such as figure 1 );

[0065] S400: Calculate the oil wells in sections, calculate the viscosity of the crude oil according to the relationship between the reservoir depth and the viscosity of the crude oil, make a section every 100m, make an average value of the viscosity of the crude oil every 100m...

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Abstract

The invention discloses a method for judging the chemical-viscosity-reduction assisted thickened-oil screw pump lifting technology. The method includes: determining relevant parameters of oil-deposit oil wells produced and developed, determining lift of a screw pump through oil deposit depth, determining lifting speed according to daily output, performing subsection calculation on the oil wells, and calculating friction loss of each section in subsection iteration; summarizing linear loss and wellhead back pressure, comparing the sum of the linear loss and the wellhead back pressure with the lift of the screw pump, and if values are different, repeating the step after viscosity-temperature curves are changed till the values are identical; calculating viscosity of crude oil, corresponding to reservoir temperature, at the position of the downhole through the viscosity-temperature curves. Screw pump lifting is prepared for mining of thickened oil, the chemical viscosity reduction technology is matched in order to prevent insufficient lifting capacity, and certain guidance is given whether to adopt screw pump or not in on-site production and development of shallow thickened oil.

Description

technical field [0001] The invention relates to a method for judging a chemical viscosity-reducing auxiliary screw pump lifting heavy oil process, and belongs to the technical field of oilfield exploitation. Background technique [0002] The screw pump has excellent performance advantages in the process of oil well lifting: Compared with other mechanical oil production equipment, the screw pump oil production system has the following advantages: (1) High pump efficiency - The screw pump has high volumetric efficiency, generally 70% to 90% , The pumping efficiency of ordinary oil pump is 30% to 60%, and the pump efficiency of electric submersible pump is 40% to 50%. The screw pump is one of the pumps with the smallest energy consumption and high pump efficiency among the existing oil production machinery and equipment. (2) Save investment - Compared with electric submersible pump, hydraulic piston pump and beam pumping unit, screw pump is the first choice for exploration wel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/008
CPCE21B47/008
Inventor 叶仲斌朱诗杰陈蕾舒政刘舒羽施雷庭陈洪
Owner SOUTHWEST PETROLEUM UNIV
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