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Breakdown fluid and preparation method thereof

A technology of fracturing fluid and lye, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as shrinkage, lower fracturing fluid viscosity, and poor technical and economic effects, so as to improve adaptability and durability thermal performance, reducing hydraulic fracturing power demand, and inhibiting the effect of coagulation

Active Publication Date: 2011-10-26
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hydraulic fracturing is one of the main offensive measures for the reconstruction of oil and gas layers in low-permeability oilfields. The guar gum or hydroxypropyl guar gum fracturing fluids currently used are mostly freshwater-based fracturing fluids, which are suitable for offshore oilfields with little fresh water resources or for high-pressure When the well needs high-salinity and high-density water-based fracturing fluid, this fracturing fluid system is prone to shrinkage in seawater with high ionic strength, which reduces the viscosity of the fracturing fluid, thereby affecting the sand-carrying ability of the fracturing fluid , reduce the use effect of fracturing fluid, the technical and economic effect becomes worse, and it is difficult to meet the needs of fracturing construction

Method used

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  • Breakdown fluid and preparation method thereof
  • Breakdown fluid and preparation method thereof
  • Breakdown fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] a. First prepare the thickener, the steps are as follows:

[0055] 1. Pretreat the melon collagen powder under high temperature steam;

[0056]2. Pump 50 liters of mixed solvent of ethanol and water (volume ratio 4:1) into the reaction kettle, start the mixer, slowly add 15kg of melon collagen powder (flaky); then add 0.1kg of cetyl trimethyl Ammonium chloride as a phase transfer catalyst;

[0057] 3. Stir and heat up to 30°C-40°C at a heating rate of 1°C-3°C / min;

[0058] 4. Pump 0.9kg NaOH and 2.5 liters of H 2 O, alkalized for 30 minutes;

[0059] 5. After the alkalization finishes, add dropwise the propylene oxide (mol ratio 1: 1), pump 0.9kg NaOH and 2.5 liters of H 2 O;

[0060] 6. Rise to 50-70°C at a heating rate of 1°C-3°C / min, and react for 4-6 hours;

[0061] 7. After the reaction, wash with glacial acetic acid and ethanol, then dry and pulverize to obtain the thickener of the following formula:

[0062]

[0063] b. Use a graduated cylinder to meas...

Embodiment 2

[0065] a. First prepare the thickener, the steps are as follows:

[0066] 1. Pretreat the melon collagen powder under high temperature steam;

[0067] 2. Pump the mixed solvent (volume ratio 4:1) of 50 liters of ethanol and water into the reaction kettle, start the stirrer, and slowly add 15Kg melon collagen powder (flaky). Add 0.1kg cetyltrimethylammonium chloride as phase transfer catalyst;

[0068] 3. Stir and heat up to 30°C to 40°C at a heating rate of 1°C to 3°C / min;

[0069] 4. Pump 0.9kg NaOH and 2.5 liters of H 2 O, and alkalized for 30 minutes;

[0070] 5. After alkalization finishes, add dropwise the ion pair monomer 3-chloro-2-hydroxypropyl-N of 9.75kg, N-dimethyl-carboxybetaine and 4.0kg chloroethanol (molar ratio 1: 1), Pump in 0.9 kg NaOH and 2.5 liters of H 2 O;

[0071] 6. Rise to 50-70°C at a heating rate of 1°C-3°C / min, and react for 4-6 hours;

[0072] 7. After the reaction, wash with glacial acetic acid and ethanol, then dry and pulverize to obtain ...

Embodiment 3

[0076] a. First prepare the thickener, the steps are as follows:

[0077] 1. Pretreat the melon collagen powder under high temperature steam;

[0078] 2. Pump 50 liters of mixed solvent of ethanol and water (volume ratio 4:1) into the reaction kettle, start the mixer, slowly add 15Kg of melon collagen powder (flaky); add 0.1kg of cetyl trimethyl chloride Ammonium chloride is used as a phase transfer catalyst;

[0079] 3. Stir and heat up to 30°C to 40°C at a heating rate of 1°C to 3°C / min;

[0080] 4. Pump 0.9kg NaOH and 2.5 liters of H 2 O, and alkalized for 30 minutes;

[0081] 5. After alkalization finishes, add dropwise the ion pair monomer 2 of 9.42kg, 3-epoxypropyl-N, the sodium chloroacetate aqueous solution of N-dimethyl-sulfobetaine and 4.7kg (molar ratio 1: 1), pump 0.9kg NaOH and 2.5 liters of H 2 O.

[0082] 6. Rise to 50-70°C at a heating rate of 1°C-3°C / min, and react for 3-5 hours;

[0083] 7. After the reaction, wash with glacial acetic acid and ethanol,...

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Abstract

The invention relates to a breakdown fluid and a preparation method thereof. The breakdown fluid comprises the following components: thickener 0.3-1.2%, clay stabilizer 0.5-2%, bactericide 0.01-0.2%, cleanup additive 0.2-1%, and the balance of water-borne working fluid, wherein the thickener is a betaine-type amphoteric thickener based on guar gum derivatives and has a structural formula (I): wherein R is selected from hydroxylpropyl group, hydroxyethyl group, carboxymethyl group and 2-hydroxylpropyl-N,N,N-trimethyl group; R1 and R2 independently represent C1-C4 alkyl group, R3 represents carboxylate radical COO<-> or sulfonate radical SO3<->; and the degree of substitution of R is 0.02-0.6, and the degree of substitution of the betaine type amphoteric ions is 0.02-0.6.

Description

technical field [0001] The invention relates to a fracturing fluid and a preparation method thereof. Background technique [0002] Hydraulic fracturing is one of the main offensive measures for the reconstruction of oil and gas layers in low-permeability oilfields. The guar gum or hydroxypropyl guar gum fracturing fluids currently used are mostly freshwater-based fracturing fluids, which are suitable for offshore oilfields with little fresh water resources or for high-pressure When the well needs high-salinity and high-density water-based fracturing fluid, this fracturing fluid system is prone to shrinkage in seawater with high ionic strength, which reduces the viscosity of the fracturing fluid, thereby affecting the sand-carrying ability of the fracturing fluid , reduce the use effect of fracturing fluid, and the technical and economic effect becomes worse, making it difficult to meet the needs of fracturing construction. [0003] Therefore, there is a need for an improved...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 李学军莫成孝王雪山陈小华陈晃张福铭
Owner CHINA NAT OFFSHORE OIL CORP
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