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Temperature-resistant and salt-resistant silica gel fracturing fluid and preparation and application thereof

A technology of temperature resistance and salt resistance, fracturing fluid, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of long synthesis cycle, influence on viscosity increase performance, high cost, and achieve good temperature resistance and salt resistance. , the stability is easy to control, the effect of good viscosity increasing effect

Active Publication Date: 2021-11-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two key factors restricting the development of this technology at this stage: ①The total salinity of flowback water is generally between tens of thousands to hundreds of thousands, or even higher, and the types and quantities of mineral ions contained in flowback water are different in different regions It is also relatively large. It is difficult for the commonly used natural thickeners and indoor synthetic thickeners to completely hydrate and swell under such high salinity conditions; Most of them are organic matter, which will cause the thickener to rot and deteriorate after being placed for a long time, seriously affecting its viscosity-increasing performance
[0004] At home and abroad, most of the existing studies on temperature-resistant and salt-resistant fracturing fluids focus on the preparation of seawater-based fracturing fluids. For example, Chinese patent CN105331352A discloses a seawater-based fracturing fluid and a preparation method for seawater-based fracturing fluids. Chinese patent CN106190088A discloses a heat-resistant and salt-resistant instant thickener for seawater-based fracturing fluid and its preparation method. Although the salinity of the seawater-based fluid involved in these prior art reaches 40000-50000ppm, the used Most of the thickeners use the method of indoor molecular design. By introducing multifunctional groups such as hydrophilic groups, temperature-resistant groups and salt-resistant groups on long-chain molecules, the temperature-resistant and salt-resistant performance of fracturing fluids is improved. , although the thickener synthesized by this method has certain heat-resistant and salt-resistant properties, there are still problems such as complex synthesis process, long synthesis cycle, low product yield and high cost, and as the degree of salinity continues to increase, its Salt tolerance tends to be inhibited, and it is difficult to maintain good properties in flowback water with extremely high salinity

Method used

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  • Temperature-resistant and salt-resistant silica gel fracturing fluid and preparation and application thereof
  • Temperature-resistant and salt-resistant silica gel fracturing fluid and preparation and application thereof
  • Temperature-resistant and salt-resistant silica gel fracturing fluid and preparation and application thereof

Examples

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Effect test

Embodiment 1

[0050] This embodiment provides the preparation method of acidic silica sol and investigates the influence of the pH value of acidic silica sol on its stability:

[0051] Wherein, the preparation method of described acidic silica sol comprises:

[0052] Weigh 5g of sodium silicate solid with a purity of 99.8% in the room and add it to a beaker filled with 95g of deionized water, and heat and stir in a water bath at 50-60°C until the sodium silicate solid is completely dissolved to obtain Sodium silicate aqueous solution with a viscosity of 4.5-5.5mPa·s, based on the total mass of sodium silicate aqueous solution as 100%, the mass concentration of silicon dioxide is 5% (ignoring 0.2% of other soluble substances and extremely A small amount of insoluble matter), the rest are alkali metal salts and deionized water;

[0053] Take another beaker, and dilute concentrated hydrochloric acid with a mass concentration of 37% according to the volume ratio of 100:85 to water into a dilut...

Embodiment 2

[0060] This embodiment provides the preparation method of acidic silica sol and investigates the influence of the mass concentration of silicon dioxide on its stability:

[0061] Wherein, the preparation method of described acidic silica sol comprises:

[0062] Weigh 2.5g, 5g, 7.5g, 10g, 15g, 20g, 25g of sodium silicate solids in the room and add them to 97.5g, 95g, 92.5g, 90g, 85g, 80g, 75g of deionized Put it in a beaker of water, and heat and stir in a water bath at 50-60°C until all the sodium silicate solids are dissolved to obtain an aqueous solution of sodium silicate with a viscosity distribution between 2.5-12mPa·s. The total mass of the aqueous solution of sodium silicate Calculated as 100%, the mass concentration of silicon dioxide is 2.5%, 5%, 7.5%, 10%, 15%, 20% and 25% respectively, and the rest is alkali metal salt and deionized water;

[0063] Then the above sodium silicate aqueous solution was added into dilute hydrochloric acid solution with a mass concentra...

Embodiment 3

[0069] This example provides three kinds of temperature-resistant and salt-resistant silica gel fracturing fluid, and the flow chart of its preparation method is as follows figure 1 shown, from figure 1 It can be seen that the preparation method comprises the following specific steps:

[0070] Preparation of acidic silica sol:

[0071] Weigh 5g of sodium silicate solid in the room and add it into a beaker filled with 95g of deionized water, and heat and stir in a water bath at 50-60°C until all the sodium silicate solid dissolves to obtain a viscosity of 4.5- 5.5mPa·s sodium silicate aqueous solution, based on the total mass of sodium silicate aqueous solution as 100%, wherein the mass concentration of silicon dioxide is 5%, and the rest is alkali metal salt and deionized water;

[0072] Then the above-mentioned sodium silicate aqueous solution was added to the dilute hydrochloric acid solution with a mass concentration of 25% for mixing, so that the pH value of the formed a...

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Abstract

The invention provides a temperature-resistant and salt-resistant silica gel fracturing fluid and preparation and application thereof. The temperature-resistant and salt-resistant silica gel fracturing fluid is prepared by mixing acidic silica sol and pretreated fracturing return water according to the pH value of a mixed solution of 7.5-8.5 and gelatinizing the silica sol. The acid silica sol, namely the silicon dioxide sol, is used as a thickening agent, the thickening agent and the pretreated high-mineral-degree fracturing return water are directly subjected to online preparation to obtain the temperature-resistant and salt-resistant silica gel fracturing fluid, the used acid silica sol thickening agent has good temperature resistance and salt resistance, the preparation process is simple, the cost is low, and a good tackifying effect can still be kept in high-salinity fracturing return water. The stability of the temperature-resistant and salt-resistant silica gel fracturing fluid can be controlled by adjusting the pH value of the acidic silica sol and the content of silicon dioxide, namely the stability of the temperature-resistant and salt-resistant silica gel fracturing fluid is easy to control.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant silica gel fracturing fluid and its preparation and application, belonging to the technical field of oil and gas development and reservoir transformation. Background technique [0002] Hydraulic fracturing technology plays an important role in the stimulation of unconventional oil and gas reservoirs, and fracturing fluid is an important part of hydraulic fracturing technology, its main function is to create fractures and transport proppant along the open fractures , to form sand-filled fractures with high conductivity. The extension and expansion of hydraulic fractures and the carrying and migration of proppant require the fracturing fluid to have a certain viscosity, so the viscosity-increasing characteristic of fracturing fluid is one of the important indicators for evaluating the performance of fracturing fluid. [0003] Among them, temperature and salinity are important factors af...

Claims

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Application Information

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IPC IPC(8): C09K8/66C09K8/84
CPCC09K8/665C09K8/845
Inventor 周福建许航姚二冬李源柏浩
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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