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Method and system for determining paraffin removal period of oil well

A determination method and wax removal technology, which are used in cleaning tools, earth-moving drilling, wellbore/well components, etc., can solve the problems of reducing oil well productivity, affecting economic benefits, and poor wax removal effect, achieving strong practicability and efficiency. Effectiveness

Pending Publication Date: 2020-07-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waxing in the oil well will gradually reduce the inner diameter of the oil outlet channel, increase the resistance of the oil flow, reduce the productivity of the oil well, and even block the oil flow channel, causing the oil well to stop production
If the number of wax removals is too small, the effect of wax removal is not good, and the wax deposition will become more and more serious; if the number of wax removals is too high, the labor intensity of workers will be increased, money will be wasted, and economic benefits will be affected

Method used

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  • Method and system for determining paraffin removal period of oil well
  • Method and system for determining paraffin removal period of oil well
  • Method and system for determining paraffin removal period of oil well

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Such as figure 1 As shown, the method for determining the oil well wax removal cycle provided in this embodiment includes:

[0063] S1. Get the current wax removal cycle; the current wax removal cycle is the difference between the current wax removal time and the last wax removal time;

[0064] S2, according to the current wax removal process, the tension of the traction rope when the wax removal device is lowered to determine the level of resistance to wax removal;

[0065] S3. Determine the next waxing cycle according to the current waxing cycle and the level of resistance to waxing.

[0066] Exemplarily, obtaining the current wax removal period includes obtaining the current wax removal period stored in advance; or, obtaining the current wax removal period includes determining the difference between the current wax removal time and the last wax removal time, and the difference The value is used as the current wax removal cycle. The wax removal cycle is the time interval fro...

Embodiment 2

[0120] In this embodiment, the method for determining the wax removal period will be further described by taking the case where the depth of the wax precipitation point of an oil well exceeds 2 km as an example.

[0121] The most common wax removal depth in oil well wax removal is 2km, and when the wax removal cost is settled, the wax removal depth is 2km as a node, that is, when the wax removal depth is less than 2km, it is a kind of wax removal price. Wax costs will increase substantially. The general wax removal depth is 50-100m below the wax precipitation point. When the oil well depth is above 4km, due to the higher geothermal temperature, wax formation will not occur in the part exceeding the depth of 4km. Therefore, the wax removal with a depth of less than 2km can be called shallow wax removal; the wax removal with a depth of more than 2km is called deep wax removal. Because the oil well has a temperature gradient in the depth direction, the higher the oil well, the high...

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Abstract

The invention provides a method and system for determining a paraffin removal period of an oil well, and belongs to the technical field of oil extraction engineering. The method comprises the following steps of obtaining a current paraffin removal period, wherein the current paraffin removal period is the difference value between current paraffin removal time and previous paraffin removal time; determining the level for blocking paraffin removal according to the tension of a traction rope when a paraffin removal device is lowered in the current paraffin removal process; and determining the next paraffin removal period according to the current paraffin removal period and the level for blocking paraffin removal. The next paraffin removal period is determined by the current paraffin removal period and the level for blocking paraffin removal, a paraffin removal plan can be formulated in advance, and the problems that the paraffin removal times are too few, so that oil paraffin precipitation is serious, and oil well production is influenced or the problems that the manpower, time and capital are wasted due to too many times of oil well paraffin removal are avoided. The method and the system for determining the paraffin removal period of the oil well have very strong practicability and effectiveness.

Description

Technical field [0001] The invention relates to a method and a system for determining the wax removal period of an oil well, and belongs to the technical field of oil extraction engineering. Background technique [0002] In the process of extracting crude oil, the paraffin dissolved in the crude oil will crystallize and precipitate from the crude oil as the external pressure and temperature decrease. With further changes in conditions, paraffin wax is continuously precipitated, and its crystals will accumulate and settle on equipment and tools such as tubing, casing, sucker rod, and oil pump. This phenomenon is called wax deposition. Oil well waxing is a mixture of black semi-solid and solid paraffin, asphalt, gum, silt and other impurities. The higher the wax content in crude oil, the more serious the wax formation in the oil well. [0003] The wax removal methods in the prior art include mechanical wax removal, thermal wax removal, chemical wax removal, and microbial wax remova...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B37/02E21B37/00
CPCE21B47/00E21B37/02E21B37/00Y02A20/204
Inventor 金子涵王宏曹鹏王光辉陈文袁梓钧胥珍珍南雨岑杜洋岳清政张新海冯京涛史贺东李子文李冠军
Owner PETROCHINA CO LTD
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