Method for hot cleanout and paraffin removal of oil well

An oil well and hot washing technology, which is applied to cleaning equipment, earthwork drilling, wellbore/well components, etc., can solve the problems of long recovery period of pumping wells and formation pollution of oil wells, and achieve the effect of reducing wax cleaning cost and investment.

Inactive Publication Date: 2005-11-30
黄灏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the injected water cannot be discharged in time, the well will be killed and the formation of the oil well will be polluted, and the recovery period of the pumping well will be long

Method used

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  • Method for hot cleanout and paraffin removal of oil well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A conventional pumping unit with a theoretical displacement of 1 cubic meter per hour is used to pump oil.

[0033] Put the water tank boiler into 8m 3 For water, the oil well casing gas is used to preheat the water to 70-90°C, and the gas in the casing is controlled to be discharged so that the internal pressure of the casing is lower than the rated pressure of the hot water pump. The above-mentioned hot water heated to 70-90°C is reheated to 100-120°C through the boiler car. Insulate the wellhead, use the water inlet pipe in the double-pipe structure to inject the above-mentioned superheated water at 100-120°C into the casing 4 for 5 minutes, the superheated water will flow down the outer wall of the oil pipe 6, and control the water flow to 0.8-1.2m 3 / hour, which is similar to the theoretical discharge of the pumping unit, so that part of the wax is melted. At the same time, the natural gas in the oil well is collected through the gas header in the double-pipe st...

Embodiment 2

[0037] Put the water tank boiler into 8m 3 For water, the oil well casing gas is used to preheat the water to 70-90°C, and the gas in the casing is controlled to be discharged so that the internal pressure of the casing is lower than the rated pressure of the hot water pump. Insulate well at the wellhead, stop the pumping unit, and reheat the above-mentioned hot water heated to 70-90°C to 100-120°C through the boiler car. Use the water inlet pipe in the double-pipe structure to inject the above-mentioned 100-120°C superheated water into the casing, and continuously inject 3-4 cubic meters of 100-120°C superheated water to melt all the wax deposits in the oil well. Start the pumping unit, and at the same time, continuously inject superheated water of 100-120 degrees, and the water injection flow rate is 1 cubic meter per hour, so as to ensure that the melted wax is completely discharged from the oil pipe to avoid re-waxing.

[0038] The above-mentioned embodiment 2 is suitable...

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Abstract

This invention discloses a paraffin removing method of oil well, which comprises the following steps: injecting 100-120 Deg.c superheated water to the tube when the mine pore is insulating; making the superheated water flowing down along the outer wall of oil tube whose inner wall has paraffin; fusing the paraffin. Such method can remove the paraffin deposit in the oil tube of oil well, and can discharge paraffin in time with low water consumption. It injects superheated water near ideal displacement of pumping unit, so it has smaller pollution to oil well ground layer.

Description

technical field [0001] The invention relates to a method for removing wax from an oil well, more specifically, to a method for removing wax from an oil well by hot washing. Background technique [0002] At present, among the methods of wax removal in oil wells, the wax removal effect of hot washing of boiler cars is complete and thorough, so it has been widely used. It mainly uses a boiler car to heat the water to about 80 degrees, and then injects hot water into the casing of the oil well through the water inlet pipe, and enters the oil pipe from the casing to melt the wax, and then melts the wax from the oil pipe through the pumping unit. The wax is extracted. It is difficult to heat the water to more than 100 degrees because of the one-time heating of the boiler car. After heating, the temperature of the water is low. The injected hot water can only melt and discharge the wax when it is pumped out by the pumping unit. The amount of hot water required is large. Conventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/00
Inventor 黄灏
Owner 黄灏
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