A method to solve the water lock effect

A technology of water-locking effect and water-locking, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor durability, high cost, damage, etc., and achieve the goals of convenient operation, cost-saving use, and increased oil well productivity Effect

Active Publication Date: 2016-01-20
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects that the water-locking effect is easy to occur in the oil and gas exploitation process, the existing method for releasing the water-locking effect is relatively costly, and the durability of suppressing the water-locking effect is poor, and provides A method to solve the water lock effect, preventing the damage caused by water lock to crude oil production during oil well operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 adds superhydrophilic TiO 2 / Hydrophobic polyvinylidene chloride mixed powder to solve water lock effect

[0044] 10mg of superhydrophilic TiO with a mass ratio of 90 / 10 2 / Hydrophobic polyvinylidene chloride mixed powder is added to the pipeline after the water-locking effect has been generated. It is observed that the water in the pipeline is discharged back to the outside of the pipeline, the air path is opened, and the water-locking effect is released.

[0045] According to the evaluation method of the durability of inhibiting water-locking damage, when water is added to the pipeline for the 20th time, there is still no water-locking effect, that is, the number of times of inhibiting water-locking damage is more than 20 times.

[0046] where TiO 2 The contact angle of polyvinylidene chloride is close to 0°, and the contact angle of polyvinylidene chloride is 120°.

[0047] Conclusion: After adding super-hydrophilic and hydrophobic mixed powders, th...

Embodiment 2

[0048] Example 2 Adding superhydrophilic diatomaceous earth / hydrophobic silicon carbide mixed powder to solve the water lock effect

[0049] Add 10 mg of super-hydrophilic diatomaceous earth / hydrophobic silicon carbide mixed powder with a mass ratio of 70 / 30 to the pipeline after the water lock effect is generated, and it is observed that the water in the pipeline is discharged back to the outside of the pipeline, and the gas The road is opened, and the water lock effect is lifted.

[0050] According to the evaluation method of the durability of inhibiting water-locking damage, when water is added to the pipeline for the 20th time, there is still no water-locking effect, that is, the number of times of inhibiting water-locking damage is more than 20 times.

[0051] Among them, the contact angle of diatomite powder is close to 0°, and the contact angle of silicon carbide powder is 110°.

[0052] Conclusion: After adding super-hydrophilic and hydrophobic mixed powders, the wate...

Embodiment 3

[0053] Example 3 Adding a mixed powder of superhydrophilic alumina / hydrophobic graphite powder to solve the water lock effect

[0054] Add 10 mg of super-hydrophilic alumina / hydrophobic graphite powder mixed powder with a mass ratio of 50 / 50 into the pipeline after the water-lock effect is generated, and it is observed that the water in the pipeline is discharged back to the outside of the pipeline, and the gas path is opened , the water lock effect is lifted.

[0055] According to the evaluation method of the durability of inhibiting water-locking damage, when water is added to the pipeline for the 20th time, there is still no water-locking effect, that is, the number of times of inhibiting water-locking damage is more than 20 times.

[0056] Among them, the contact angle of alumina is close to 0°, and the contact angle of graphite powder is 100°.

[0057] Conclusion: After adding super-hydrophilic and hydrophobic mixed powders, the water-locking effect can be solved, and it...

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Abstract

Disclosed is a method for solving water block effect, the method comprising: adding functional powder to pores producing water block to eliminate the water block, the functional powder being amphiphilic powder, or mixed powder consisting of ultra-hydrophilic powder and hydrophobic powder, the particle density of the functional powder being greater than 1 g / cm3, and the average particle diameter of the functional powder being less than 100 microns. The method of the present invention is simple, easy, of low cost, and has wide sources of raw material. During the use of the method, the functional powder reduces liquid-phase interfacial tension, and has good durability for inhibiting water block damage because the functional powder is small solid particles easily held in tiny holes or cracks on rock surfaces. In addition, compared with an acidifying method, the present invention greatly improves the inverted discharge effect, better solving the water block effect, thus greatly improving the productivity of an oil well.

Description

technical field [0001] The invention relates to a method for solving the water lock effect. Background technique [0002] During drilling, completion, workover and production operations, foreign phases are trapped in porous media in many cases. When another immiscible phase infiltrates into the reservoir, or the saturation of the original immiscible phase in the porous medium increases, the relative permeability will be damaged, and the permeability of the reservoir and the relative permeability of oil and gas will be significantly reduced. When the immiscible phase is water, this phenomenon is called water lock-in. [0003] The water-locking effect will produce water-locking damage, that is, the damage caused by water immersion into the oil layer during oil well operation. After water immersion, the water saturation in the near wellbore area will increase, the capillary resistance of the oil-water interface in the rock pores will increase, and the Jiamin effect will cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/03
CPCC09K8/03C09K8/52C09K8/60
Inventor 方海平李景烨狄勤丰许友生盛楠王自强
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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