Reverse wetting agent as well as preparation method and application thereof

A technology of wetting reversal and reaction products, applied in the field of petroleum exploration, can solve the problems of reduced drag reduction rate of slick water, difficult cracks, and large filtration loss, etc., to increase the effective flow radius of pore throats and weaken the physical and chemical effects. , the effect of reducing the saturation of bound water

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty of deep shale gas fracturing, the main performance is that the resistance reduction rate of slick water has limited room for improvement, especially in fractures. The width is narrow, so the frictional resistance of the fracture is large, and the proppant with different particle sizes carried by the slick water is difficult to enter the fracture and the carrying distance after entering the fracture is small)
In addition, low-viscosity slick water has a large filtration loss (deep shale gas is a fracture system that connects and extends different scales, and low-viscosity slick water is often used in the early construction stage), which also leads to a small fracture width under the same construction conditions. Difficulties in adding sand to construction
[0003] In the past, in order to solve the above problems, the viscosity of slick water was often increased appropriately to reduce fluid loss and improve the carrying capacity of proppant. The resistance reduction rate of slick water is reduced, so the reduction of displacement will lead to the reduction of fracture width and the difficulty of proppant entering fractures of different scales

Method used

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  • Reverse wetting agent as well as preparation method and application thereof
  • Reverse wetting agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0061] The object of this preparation example is to prepare a wetting reversing agent A1 containing 10% alkyltrimethylammonium bromide, 0.3% perfluorolauryl polyoxyethylene ether, 5% fatty acids and 84.7% water.

[0062] Step 1: Under the condition of continuous stirring at 800rpm, add water, alkyltrimethylammonium bromide and perfluorolauryl polyoxyethylene ether in order.

[0063] Step 2: Under the condition of continuous stirring at 800 rpm, add fatty acids to the solution obtained in step 1 until it is completely dissolved to obtain the reaction system.

[0064] Step 3: Under the condition of continuous stirring at 800 rpm and the reaction system prepared by stirring step 2 at a temperature of 35 °C for 1 hour, the wetting reversing agent A1 was obtained.

Embodiment 1

[0066] The present embodiment is used to illustrate the preparation and performance characterization of a water slip system.

[0067] (1) Take 99.3g of water, pour it into the agitator, adjust the speed of the agitator until the whirlpool formed by the liquid can see the top of the shaft of the mixer pulp leaf.

[0068] (2) Slowly and evenly add the weighed anti-drag agent 0.1g, stirring for 5min ~ 10min to make it completely dissolved.

[0069] (3) Add 0.3g of the weighed clay stabilizer and stir continuously to make it mix evenly.

[0070] (4) Add the wetting reversing agent A10.3g prepared by the weighed preparation example 1, continuously stir for 2min, form a uniform solution, stop stirring, and get a slippery water system for backup.

[0071] The performance of the prepared water slip system was tested, and the results showed that the surface tension was 19.1 mN / m and the interfacial tension was 0.9 mN / m, and the contact angle of the water slip system was 123°, and the conta...

Embodiment 2-3

[0073] The steps of Examples 2-3 are substantially consistent with Example 1, the difference is that the dosage of each component is changed (the specific dosage of each component is shown in Table 1 below, water is the margin) to prepare a slippery water system and test its performance, the result is shown in Table 1.

[0074] Table 1

[0075]

[0076]

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Abstract

The invention provides a reverse wetting agent. The reverse wetting agent comprises the following components or a reaction product of the following components: a component A) alkyl trimethyl ammonium bromide; the component B is a fluorine surfactant; component C) fatty acid; and optionally, component D) water. According to the wetting reversal agent provided by the invention, the alkyl trimethyl ammonium bromide, the fluorine surfactant and the fatty acid are combined for use, so that the wetting reversal agent has a good wetting reversal function.

Description

Technical field [0001] The present invention relates to the field of petroleum exploration, specifically to a wetting reversing agent and preparation method and application thereof. Background [0002] At present, with the large-scale promotion and application of shale gas horizontal well volumetric fracturing technology, shale gas horizontal well volumetric fracturing technology has been successfully applied in the exploration and development of shale gas with a depth of 3500m or more. However, with the deepening of the exploration and development process, shale gas with a depth of 4000m and deep has a greater amount of resources, and once a breakthrough is made to the middle and shallow layers, it will greatly change the development pattern of China's shale gas and its position in the world shale gas energy pattern. However, due to the difficulty of deep shale gas fracturing, it is mainly manifested in the limited room for the reduction rate of slippery water, especially in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/60C09K8/68C09K8/88
CPCC09K8/584C09K8/604C09K8/602C09K8/68C09K8/882
Inventor 蒋廷学魏娟明丁士东张旭东贾文峰
Owner CHINA PETROLEUM & CHEM CORP
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