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High-temperature acidic plant adhesive fracturing fluid and preparation method thereof

A technology of plant glue and fracturing fluid, which is applied in the field of fracturing and oil production in oilfields, can solve the problems of high water insoluble content, bottom layer damage, secondary pollution, etc., and achieve the effect of fast dissolution speed

Inactive Publication Date: 2019-10-11
北京宝丰春石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The temperature resistance is within 130 °C, which cannot meet the requirements of high temperature reservoir fracturing
[0004] 2. Conventional fracturing fluids are generally alkaline, and alkaline substances are easy to form precipitation with high-valent metal ions in the formation, causing damage to the bottom layer
[0005] And for acidification treatment in some special formation environments, or special operating environments that need to cooperate with carbon dioxide injection, fracturing fluids need to work under acidic conditions, and alkaline fracturing fluids cannot meet the requirements.
[0006] 3. Hydroxypropyl guar gum has a high water-insoluble content. During fracturing, not only will filter cakes be formed on the surface of the cracks, but also some residues will be left in the formation and support cracks, causing secondary pollution
It can be seen from the specific examples that this fracturing fluid is recommended for oil wells whose well temperature is lower than 90°C, which cannot meet the fracturing requirements of high-temperature wells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1, a high-temperature acidic vegetable gum fracturing fluid, consisting of the following components in mass percentage: 0.55% thickener, 1.5% conditioner, 0.8% cross-linking agent, 0.5% drainage aid, 0.5% clay stabilizer %, fungicide 0.1%, demulsifier 0.1%, and the balance is water.

[0038] The thickener is one or more of guar gum, hydroxypropyl guar gum, carboxymethyl hydroxypropyl guar gum.

[0039] The preferred thickener of the present embodiment is carboxymethyl hydroxypropyl guar gum, which is a kind of anionic and nonionic double derivative of guar gum, through double chemical modification, i.e. propylene oxide and sodium chloroacetate It is prepared by reacting with guar gum in tetrahydrofuran medium and introducing hydrophilic groups carboxymethyl and hydroxypropyl into the molecular structure of guar gum.

[0040] After modification, the water-insoluble matter is reduced, the water-soluble speed is accelerated, and the anti-corrosion storage performa...

Embodiment 2

[0054] Embodiment 2, a kind of preparation method of high-temperature acid vegetable glue fracturing fluid, comprises the following steps:

[0055] a. Take 1000mL water in the mixer, start stirring, add 5.50g thickening agent, then add 5.00g clay stabilizer, 5.00g drainage aid, 5.00g demulsifier, 1.00g bactericide in sequence, add after sticking 15.00g conditioner, keep stirring for 5min, place at 30°C for 4h to stabilize the viscosity;

[0056] b. Take 70ml of base liquid, add 0.56g of temperature-controlled cross-linking agent under stirring state, and use RS6000 high temperature and high pressure rheometer to evaluate the temperature and shear resistance after stirring. The test temperature is 160°C and the shear rate is 170s -1 , Cutting time 100min.

[0057] The final viscosity of the jelly is greater than 50mPa·s, showing good temperature and shear resistance.

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PUM

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Abstract

The invention relates to a high-temperature acidic plant adhesive fracturing fluid and a preparation method thereof. The high-temperature acidic plant adhesive fracturing fluid comprises, by mass, 0.55% of a thickening agent, 1.5% of a conditioner, 0.8% of a cross-linking agent, 0.5% of a cleanup additive, 0.5% of a clay stabilizer, 0.1% of a sterilizing agent, 0.1% of a demulsifying agent and thebalance water. The fracturing fluid has the advantages that a fracturing fluid system can be used under an acidic condition, and the damage of alkaline substances to a stratum is avoided; meanwhile,the fracturing fluid can be applied to CO2 fracturing construction; the acid plant glue fracturing fluid system is suitable for the well temperature of 160 DEG C.

Description

technical field [0001] The invention relates to a fracturing fluid for oil and gas field fracturing reconstruction, which belongs to the technical field of oil field fracturing and recovery, in particular to an acidic, high-temperature-resistant carboxymethyl hydroxypropyl guaridine fracturing fluid. Background technique [0002] With the increasing depth of exploration and development of oil and gas reservoirs, the temperature of oil and gas well reservoirs is also getting higher and higher, and wells above 130 °C are common; Fracturing fluid, this system is mainly an alkaline fracturing fluid system based on additives such as hydroxypropyl guar gum and organic boron crosslinking agent, which has the following disadvantages: [0003] 1. The temperature resistance is within 130°C, which cannot meet high temperature reservoir fracturing. [0004] 2. Conventional fracturing fluids are generally alkaline, and alkaline substances are easy to form precipitation with high-valent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90
CPCC09K8/685C09K8/887C09K8/90
Inventor 王中鹏
Owner 北京宝丰春石油技术有限公司
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