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

A fracturing fluid thickener and high temperature resistant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of difficulty in obtaining large-scale popularization and application, inability to form stable worm-like aggregates, and surfactants. Short hydrophobic chain and other problems, to achieve the effect of safe and easy industrial production, sufficient proppant suspension and transport performance, and stable viscosity

Inactive Publication Date: 2007-12-05
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the main active ingredient used in it is dihydroxyethyl ammonium chloride, which needs to be prepared by selective catalytic hydrogenation under high temperature and high pressure conditions. Not only is the process more complicated and dangerous, but it is also expensive, and the cost is lower than that of ordinary plant glue. More than 20 times that of lysate, it is difficult to obtain large-scale promotion and application
[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-l

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

[0018] Embodiment 1: prepare cationic thickener polyethylene oxide monobehenate methyl dihydroxyethyl ammonium bromide (DHAB-2)

[0019] Weigh 2040g (6 moles) of behenic acid and 17g of tetramethylammonium chloride, add it into a 5-liter autoclave, heat up to 125°C, and mix it with ethylene oxide under a pressure of 0.45MPa 721 g (16.4 mol) was reacted and aged for 5 hours. Then open the pressure reducing valve at 75°C and slowly vent. Wash with 2Kg of 10% salt water, dehydrate and filter to obtain 2510g of polyethylene oxide monobehenate.

[0020] Analyze the content of ethoxy group according to the method of standard GB7385-1987, and the average addition mole number of ethylene oxide is 2.2. In this step reaction, the fatty acid reacted with oxirane can also be replaced by aliphatic alcohol or aliphatic amine having a suitable carbon chain length. In addition to the quaternary onium salt, the catalyst in this reaction can also use Lewis acid or Lewis base.

[0021] Take ...

Embodiment 2

[0026] Embodiment 2: prepare anionic thickener polyethylene oxide monobehenate sodium sulfate (DSN-2)

[0027] Weigh 100 g (0.25 mol) of polyethylene oxide monobehenate prepared in Example 1, place in a 250 mL three-necked flask, heat to 115-120 ° C, and stir continuously for 10-15 minutes Add 25.5g (0.37 moles) of sulfamic acid, stir and react at 120-125°C for 2 hours, cool to room temperature, add sodium hydroxide for neutralization, until the pH value reaches 7.5-8.5. The crude product was recrystallized with a mixed solvent of acetone and ethyl acetate with a volume ratio of 75:25, and then dried at 60°C to obtain 89g of a pure yellowish powder. The anion was measured according to the method of standard GB / T5173-1995 The content of surfactant is 96.3%, and the yield is 77.4%.

Embodiment 3

[0028] Example 3: Preparation of high-temperature non-harmful fracturing fluid with cationic thickener DHAB-2

[0029] Get three capacity beakers that are 500 milliliters, all add the potassium chloride aqueous solution of 200 milliliters 2% (weight fraction) in each beaker, add the synthetic DHAB among 2g, 4g and 6g embodiment 1 respectively in three beakers- 2. Thoroughly stir until completely dissolved to obtain harmless fracturing fluid;

[0030] The viscosity of the fracturing fluid at different temperatures was measured with a Brookfield PVS rheometer, and the results are shown in the table below:

[0031] 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

1 84

120

72

48

...

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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, where, 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 the...

Claims

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Application Information

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