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Microemulsion for improving core wettability

A technology of wetting performance and microemulsion, applied in the field of additives for oil and gas reservoir exploitation operations, can solve problems such as low adjustability, and achieve the effects of strong adjustability, reduced capillary pressure, and good compatibility

Inactive Publication Date: 2012-01-25
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering the influence of formation wettability comprehensively, when the wettability of reservoir rock is neutral and weakly hydrophilic (65°<water contact angle<90°), the capillary pressure is small, which helps the working fluid Flowback can also eliminate the adverse effect of formation wettability on crude oil flow, and a large number of experiments have also proved that the recovery rate is the highest when the wettability of reservoir rocks is neutral and weakly hydrophilic. The core is changed to a neutral and weakly hydrophilic agent
The substances that can change the wettability of rocks are mainly surfactants. Traditional single-chain surfactants will cause wettability reversal due to their own structure limitations, and the adjustability is small.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of microemulsion for improving rock core wetting performance, composition and weight are as follows:

[0034] Get 10g OP-4, 40g OP-15, 5g Gimini1231 (R=12, s=4, X=Cl - ), 45g ethanol.

[0035] The preparation method is: mixing at normal temperature to obtain a uniform and transparent system, which is the product microemulsion.

[0036] The performance parameter of the microemulsion of this implementation is as follows:

[0037]Rock core 1 is a strongly hydrophilic rock core, and the contact angle between water and the rock core surface is 27.4°. After soaking the hydrophilic rock core with a treatment solution containing 0.1% microemulsion, the contact angle between water and the rock core is 80.4°; Core 2 is a strongly lipophilic rock core, and the contact angle between water and the rock core surface is 170.3°. After soaking the lipophilic rock core with a treatment solution containing 1% microemulsion, the contact angle between water and the rock core is 84....

Embodiment 2

[0039] A kind of microemulsion for improving rock core wetting performance, composition and weight are as follows:

[0040] Take 55g OP-10, 5g Gimini1231, 20g isopropanol, 20g ethanol.

[0041] The preparation method is: mixing at normal temperature to obtain a uniform and transparent system, which is the product microemulsion.

[0042] The performance parameter of the microemulsion of this implementation is as follows:

[0043] Core 3 is a strongly hydrophilic core, and the contact angle between water and the core surface is 31.2°. After soaking the hydrophilic core with a treatment solution containing 0.05% microemulsion, the contact angle between water and the core is measured to be 80.6° ; After soaking the lipophilic rock core 2 with a treatment solution containing 0.5% microemulsion, the contact angle between water and the rock core is 80.1°.

Embodiment 3

[0045] A kind of microemulsion for improving rock core wetting performance, composition and weight are as follows:

[0046] Get 60g AEO-9, 3g Gimini1631 (R=16, s=4, X=Br - ), 37g isopropanol.

[0047] The preparation method is: mixing at normal temperature to obtain a uniform and transparent system, which is the product microemulsion.

[0048] The performance parameter of the microemulsion of this implementation is as follows:

[0049] Soak the hydrophilic core 3 with a treatment solution containing 0.03% microemulsion, and the contact angle between water and the core is 81.7°; the core 4 is a strong lipophilic core, and the contact angle between water and the core surface is 162.8°. After immersing the oil-wet core with the treatment solution containing 0.3% microemulsion, the contact angle between water and the core is 80.4°.

[0050] The microemulsion of the present invention has a mass concentration of 0.01% to 5%, and can be directly added to the injection fluid of oil...

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Abstract

The invention relates to microemulsion for improving core wettability. The microemulsion consists of a Gimini quaternary ammonium salt cationic surfactant, a nonionic surfactant and an aid of lower alkyl alcohol; a mass ratio of the Gimini quaternary ammonium salt cationic surfactant to the nonionic surfactant is 1:(1-60); and the aid accounts for 30 to 50 mass percent of the microemulsion. The microemulsion has a characteristics of oil-water miscibility, can improve the wetting condition of a stratum to a neutral weakly waterwet condition, and obviously reduce the surface tension of working fluid so as to reduce capillary pressure, remove water lock, reduce starting differential pressure and contribute to the flowback of the working fluid, so that the stratum is prevented from being damaged by the working fluid and the effect of stably increasing production of an oil gas well is achieved.

Description

technical field [0001] The invention belongs to the field of oil and gas reservoir mining additives, in particular to a microemulsion for improving the wetting performance of rock cores. Background technique [0002] In the process of oil and gas development, after foreign fluids such as drilling fluid, cementing fluid and fracturing fluid invade the reservoir, due to the retention of capillary force, the driving pressure of the formation cannot completely discharge the foreign fluid from the formation, and the water saturation of the reservoir will increase. , the permeability of the oil and gas phase will decrease, resulting in liquid lock, and at the same time, the oil and gas recovery will be reduced, and the damage of the injected fluid to the reservoir will be increased. The flowback of the working fluid and the recovery of crude oil have opposite requirements on the wettability of the formation. When the formation is oil-wet, the capillary drop phenomenon is beneficia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/82
Inventor 郭丽梅郭燕崔明月杨振周胥云卢拥军崔伟香
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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