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Phosphate anhydrous fracturing fluid gelling agent and preparation and applications thereof

An anhydrous fracturing fluid and gelling agent technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as troublesome fracturing construction, large construction energy consumption, poor fluidity, etc., and achieve the speed of gel formation. Fast, easy fracturing operation, good flow performance

Active Publication Date: 2014-12-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this technology are: (1) toluene solvent is added in the process of synthesizing the gelling agent, which is easy to pollute the environment and is not conducive to environmental protection; (2) the dialkyl phosphate aluminum synthesized by this method uses a long Carbon-chain alcohols, the finished products are mostly high-viscosity liquids or paste-like solids, with poor fluidity and high energy consumption for on-site construction (often need to heat and mix liquid), causing troubles for on-site fracturing construction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) First, add 25g of phosphoric acid, 20g of phosphorus pentoxide and 26g of dodecanol into a 250mL three-necked flask equipped with a mechanical stirrer, a condenser and a thermometer, and react at a constant temperature of 60°C for 5h. After the constant temperature reaction is completed, the temperature is lowered to 50° C., the temperature is maintained, and the stirring is stopped. That is, the polyphosphate intermediate is obtained.

[0019] (2) Add the mixed alcohol composed of 8g of n-butanol, 18g of n-pentanol and 30g of n-octanol to another three-necked flask, and react at constant temperature for 1h at 50°C to obtain 56g of mixed alcohol, stop stirring for later use .

[0020] (3) All 56 g of mixed alcohols at 50° C. were put into the monoalkyl phosphate flask. At 90 ° C, constant temperature reaction 6h. That is, dialkyl phosphate.

[0021] In 100ml of n-pentane, add 1.0g of the phosphate ester anhydrous fracturing fluid thickener obtained above and 3.0...

Embodiment 2

[0023] (1) First, add 22g of phosphoric acid, 20g of phosphorus pentoxide and 26g of dodecanol into a 250mL three-necked flask equipped with a mechanical stirrer, a condenser and a thermometer, and react at a constant temperature of 70°C for 5h. After the constant temperature reaction is completed, the temperature is lowered to 50° C., the temperature is maintained, and the stirring is stopped. That is, the polyphosphate intermediate is obtained.

[0024] (2) Add mixed alcohol consisting of 10 g of n-propanol, 20 g of n-pentanol and 35 g of n-hexanol into another three-necked flask, and react at a constant temperature at 50° C. for 1 hour to obtain 65 g of mixed alcohol. Stop stirring for later use.

[0025] (3) All 65 g of mixed alcohols at 50° C. were put into the monoalkyl phosphate flask. At 90 ° C, constant temperature reaction 6h. That is, dialkyl phosphate.

[0026] In 100ml of n-hexane, add 1.0g of the phosphate ester anhydrous fracturing fluid gelling agent obtaine...

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Abstract

The invention relates to a phosphate anhydrous fracturing fluid gelling agent and a preparation method thereof. The preparation method comprises the following steps: by taking phosphoric acid, phosphorus pentoxide and C12-C18 alcohol as raw materials, reacting for 4-6 hours at a temperature of 60-70 DEG C so as to obtain a monoalkyl phosphate ester, wherein the molar ratio of phosphoric acid to phosphorus pentoxide to the C12-C18 alcohol is (1.3 to 1.3 to 1)-(1.1 to 1.1 to 1); and reacting the monoalkyl phosphate ester with a mixed alcohol of propyl alcohol or / and butyl alcohol, amyl alcohol, hexyl alcohol or / and capryl alcohol so as to obtain a dialkyl phosphate ester, wherein the molar ratio of the mixed alcohol to the monoalkyl phosphate ester is (4 to 1)-(2 to 1), and the mixed alcohol comprises 7-10% of propyl alcohol and / or butyl alcohol, 20-40% of amyl alcohol, and 50-60% of hexyl alcohol or / and capryl alcohol in percentage by mass. The phosphate gelling agent is good in flowability, suitable for continuous fracturing construction, and low in cost, and can, with short-carbon-chain alkanes, form an anhydrous fracturing fluid with a viscosity of 90-140 mPa.s.

Description

technical field [0001] The invention relates to a phosphate ester anhydrous fracturing fluid gelling agent and its preparation and application. Background technique [0002] Chinese patent CN00100278.3 discloses an aluminum phosphate ester oil-based fracturing fluid gelling agent and a preparation method thereof. This phosphate aluminum oil-based fracturing fluid gelling agent is composed of short carbon chain alkyl (C 1 -C 4 ), medium length carbon chain alkyl (C 6 -C 10 ) and long carbon chain alkyl (C 12 -C 18 ) composed of dialkyl phosphate aluminum and its solvent toluene, the preparation steps are: (1) reacting triethyl phosphate and phosphorus pentoxide to prepare polyphosphate intermediate; (2) polyphosphate intermediate and Butanol, pentactyl alcohol, the mixed alcohol reaction of cetyl to octadecyl alcohol generates dialkyl phosphate intermediate; (3) dialkyl phosphate reacts with aluminum sulfate to generate dialkyl phosphate aluminum; (4) add Toluene solve...

Claims

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Application Information

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IPC IPC(8): C09K8/70C09K8/64
CPCC09K8/64C09K8/70
Inventor 薛小佳徐永高慕立俊赵振峰李宪文张矿生吕海燕吴江范华波刘静李志忠李楼楼刘锦吕宝强
Owner PETROCHINA CO LTD
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