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Method for judging chemical-viscosity-reduction assisted thickened-oil screw pump lifting 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, etc., to achieve the effect of reducing trial production losses

Active Publication Date: 2017-05-31
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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  • Method for judging chemical-viscosity-reduction assisted thickened-oil screw pump lifting technology
  • Method for judging chemical-viscosity-reduction assisted thickened-oil screw pump lifting technology
  • Method for judging chemical-viscosity-reduction assisted thickened-oil screw pump lifting 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 lifting capacity of the screw pump. This oil well only produces oil, no gas or water;

[0060] S100, determine the relevant parameters of the oil reservoir of this well as in Table 2; wherein the wellhead back pressure 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 reservoir depth can determine that the head of the screw pump is 15.50MPA;

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

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

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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 the heavy oil lifting process of a chemical viscosity-reducing auxiliary screw pump, which belongs to the technical field of oilfield exploitation. Background technique [0002] Screw pumps have excellent performance advantages in the oil well lifting process: Compared with other mechanical oil production equipment, screw pump oil production systems have the following advantages: (1) High pump efficiency - high volumetric efficiency of screw pumps, generally 70% to 90% , The pump efficiency of ordinary well pump is 30%-60%, and the pump efficiency of electric submersible pump is 40%-50%. The screw pump is one of the pumps with the least energy consumption and high pump efficiency in the existing oil production machinery and equipment. (2) Saving investment - Compared with electric submersible pumps, hydraulic piston pumps, and beam pumping units, screw pumps are the first choice for exploration wells, test...

Claims

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Application Information

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Patent Type & Authority Applications(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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