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Fire-resistant non-injury fracturing fluid thickening agent and preparation method and usage thereof

A fracturing fluid thickener and high-temperature resistance technology, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., to achieve the effects of improved temperature resistance, safety, easy industrial production, and improved high temperature resistance.

Inactive Publication Date: 2011-11-23
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patents CN1439691 and CN1621484 propose small molecule surfactant fracturing fluid ratio with long carbon chain alkyl trimethyl quaternary ammonium salt and oleic acid as main components The cost of foreign clean fracturing fluids has been greatly reduced, about three times the cost of vegetable gum fracturing fluids. Unable to form stable worm-like aggregates, it is only suitable for hydraulic fracturing operations in low-temperature formations with temperatures below 80°C
[0005]China.com "Suggestions on my country's Oil and Gas Resources Development Strategy" (Chen Zhouqi, www.china.org.cn, 2002 / 3 / 5) pointed out that many major oil fields on land in my country have entered the middle and late stages of development, and low-permeability or ultra-low-permeability oil and gas reservoirs with a buried depth of more than 3,500 meters account for more than half of the total recoverable reserves. The inevitable trend faced by old oilfields, the existing fracturing fluid can no longer meet the needs of my country's energy exploitation, and it is an urgent task to develop a non-harmful fracturing fluid with good temperature resistance and moderate cost

Method used

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  • Fire-resistant non-injury fracturing fluid thickening agent and preparation method and usage thereof
  • Fire-resistant non-injury fracturing fluid thickening agent and preparation method and usage thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Preparation of cationic thickener polyethylene oxide monobehenate methyl dihydroxyethyl ammonium bromide (DHAB-2)

[0021] Weigh 2040g (6 moles) of behenic acid and 17g of tetramethylammonium chloride, put them into a 5-liter autoclave, heat up to 125°C, and mix them with ethylene oxide under a pressure of 0.45MPa 721 g (16.4 mol) were reacted and matured for 5 hours. Then open the pressure relief valve at 75°C and vent slowly. It is washed with 2Kg of 10% salt water, dehydrated and filtered to obtain 2510 g of polyethylene oxide monobehenate.

[0022] According to the standard GB 7385-1987 method to analyze the content of ethoxy group, the average added mole number of ethylene oxide is 2.2. The fatty acid reacted with ethylene oxide in this step can also be replaced by fatty alcohol or fatty amine with equivalent carbon chain length. In addition to quaternary onium salts, Lewis acids or Lewis bases can also be used as catalysts in this reaction.

[0023] Weigh ...

Embodiment 2

[0028] Example 2: Preparation of anionic thickener polyethylene oxide monobehenate sodium sulfate (DSN-2)

[0029] Weigh 100g (0.25 mol) of polyethylene oxide monobehenate prepared in Example 1, put it in a 250mL three-necked flask, heat it to 115~120℃, and keep stirring for 10~15 minutes Add 25.5g (0.37mol) of sulfamic acid, stir and react at 120-125°C for 2 hours, cool to room temperature, add sodium hydroxide to neutralize, until the pH value reaches 7.5-8.5. The crude product was recrystallized with a mixed solvent of acetone and ethyl acetate at a volume ratio of 75:25, and then dried at 60°C to obtain 89 g of pure yellowish powder, which was measured according to the standard GB / T 5173-1995 method The content of anionic surfactant was 96.3%, and the yield was 77.4%.

Embodiment 3

[0030] Example 3: Using cationic thickener DHAB-2 to prepare high temperature non-damaging fracturing fluid

[0031] Take three beakers with a capacity of 500 ml, add 200 ml of a 2% (weight fraction) potassium chloride aqueous solution to each beaker, and add 2g, 4g and 6g of the DHAB- synthesized in Example 1 into the three beakers. 2. Stir fully to dissolve completely, and get a harmless fracturing fluid;

[0032] The viscosity of the fracturing fluid at different temperatures was measured by Brookfield PVS rheometer. The results are shown in the following table:

[0033] Temperature(℃) 60 80 100 110 120 130 Viscosity (cp) 170S -1 1%DHAB-2 115 63 28 - - - 2%DHAB-2 162 124 106 74 22 - 3%DHAB-2 308 246 184 120 72 48

[0034] It can be seen from the above table that the temperature resistance of fracturing fluid increases with the increase in the amount of thickener DHAB-2; however, without adding any high temperature stabilizer, the fracturing fluid...

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Abstract

The present invention is thickener for heat resistant no-harm fracturing fluid and its preparation process and use. The thickener in the general expression of R1-X-(EO)m(PO)n-Y, wherein R1 is long chain hydrophobic group, EO is ethoxy group, PO is 2-oxidized propyl group, m and n are average addition molar numbers, X is linking group ether bond, ester bond or amido bond, Y is hydrophilic group quaternary ammonium group, carboxyl group, sulfuric group or sulfonic group, is prepared through esterification or addition and further reaction. When the thickener is applied, the thickener in 1-3 weight portions and high temperature stabilizer in 0.05-0.4 weight portion are added into base fluid compounded with halogen salt in 2-3 weight portions and water in 100 weight portions to obtain heat resistant no-harm fracturing fluid for increasing yield of oil-gas field.

Description

Technical field: [0001] The invention belongs to the technical field of fracturing fluids in oil and gas fields, and in particular relates to a small-molecule surfactant thickener for high-temperature-resistant and harmless fracturing fluids and a preparation method thereof. Background technique: [0002] U.S. "International Society of Petroleum Engineers Journal" 1998 page 43 (article number SPE39785) once reported that the plant glue fracturing fluid widely used in the oil and gas field fracturing stimulation is not enough to pump into the formation after the completion of the construction. 40%, a large number of "non-proppant solids" remaining inside the formation will block artificial diversion fractures and formations, making formation permeability unable to be significantly improved and seriously reducing oil recovery. [0003] U.S. Patent U.S.P.5,551,516 proposes a clean fracturing fluid based on small-molecule surfactants, which adjusts its viscosity by adjusting th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/66
Inventor 严云飞杨海洋
Owner UNIV OF SCI & TECH OF CHINA
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