Association-type non-crosslinking fracturing fluid and preparation method thereof

A polymer and monomer solution technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of limited application range of fracturing fluid, not suitable for large-scale fracturing construction, difficult to control water loss, etc.

Active Publication Date: 2013-07-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the introduction of this technology in my country, some improvements have been made in practice and some effects have been achieved. However, some problems have also been exposed. The most important ones are that the performance and cost of the working fluid are difficult to balance, the temperature resistance is poor, and the water loss is difficult to control. 1. It is difficult to fractu

Method used

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  • Association-type non-crosslinking fracturing fluid and preparation method thereof
  • Association-type non-crosslinking fracturing fluid and preparation method thereof
  • Association-type non-crosslinking fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Example 1 Synthesis of Water-Soluble Hydrophobic Association Polymer Fracturing Fluid Thickener—Copolymerization Method

[0071] A water-soluble hydrophobic association polymer fracturing fluid thickener was prepared by copolymerization. See Table 1 for monomers, initiators, feed ratios of instant aids, water insolubles and viscosities under different temperature conditions.

[0072] Table 1 Associative thickener prepared by copolymerization

[0073]

[0074] Note: AM, NaAA, C12DMAAC, C14DMAAC, and C18DMAAC represent acrylamide, sodium acrylate, dodecyl dimethyl allyl ammonium chloride, tetradecyl dimethyl allyl ammonium chloride, octadecane respectively dimethyl allyl ammonium chloride.

[0075] In Table 1, the synthetic instant aid is composed of: sodium sulfate: urea: sodium formate: OP=2:1.5:0.25:0.25 (mass ratio), wherein OP is alkylphenol polyoxyethylene ether (OP-10).

[0076] In Table 1, the initiator I consists of: ammonium persulfate: sodium bisulfite = ...

Embodiment 2

[0091] Example 2 Synthesis of water-soluble hydrophobically associated polymer fracturing fluid thickener - hydrolysis after copolymerization

[0092] A water-soluble hydrophobically associated polymer fracturing fluid thickener was prepared by hydrolysis after copolymerization. See Table 3 for monomers, initiators, feed ratios of instant aids, water insolubles, and viscosities at different temperatures.

[0093] Table 3 Associative thickeners prepared by hydrolysis after copolymerization

[0094]

[0095] In Table 3, the composition of the synthetic instant aid is: sodium sulfate: urea: sodium formate: OP=2:1.5:0.25:0.25 (mass ratio).

[0096] In Table 3, the initiator I consists of: ammonium persulfate: sodium bisulfite = 1:1 (mass ratio).

[0097] In Table 3, the composition of initiator II is: ammonium persulfate: sodium bisulfite: V40=0.5:1:0.5 (mass ratio).

[0098] Mix all components in Table 3 except the initiator in a 2000mL beaker, pass high-purity nitrogen gas...

Embodiment 3

[0105] Example 3 Synthesis of Water-Soluble Hydrophobic Association Polymer Fracturing Fluid Thickener——Adiabatic Copolymerization and Cohydrolysis

[0106]Preparation of water-soluble hydrophobically associated polymer fracturing fluid thickener by adiabatic copolymerization and cohydrolysis. According to the feed ratio in Table 5, first add water (deionized water or reverse osmosis water) into a container with a stirred ceramic, stainless steel or glass inner wall, and then add NaOH, because a lot of heat will be generated when the alkali dissolves, so pay attention to the speed of adding NaOH not too fast. Then add AM, C12DMAAC (or C14DMAAC, C18DMAAC), AMPS (if any) instant aids in turn to stir the above components evenly, then control the temperature of the material to 25°C, and transfer it to a thermally insulated container with a ceramic inner wall with a temperature detector , Nitrogen flow for 15 minutes, add initiator, continue nitrogen flow for 15 minutes, stop nitr...

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Abstract

The invention provides association-type non-crosslinking fracturing fluid and a preparation method thereof. The association-type non-crosslinking fracturing fluid is prepared from hydrophobic modified partial hydrolytic polyacrylamide and derivatives of the hydrophobic modified partial hydrolytic polyacrylamide serving as active ingredients, a gel breaker, potassium chloride, an optional surface active agent and water, wherein each of the molecular structures of the hydrophobic modified partial hydrolytic polyacrylamide and the derivatives of the hydrophobic modified partial hydrolytic polyacrylamide contains acrylamide monomer unit, at least one biparental unsaturated monomer unit and at least one an anion alkene unsaturated monomer unit. As the molecular structure of a thickening agent contains a biparental monomer unit, a reversible super-molecule network can be formed in an aqueous solution through intermolecular hydrophobic association, and the high viscosity and the suspending power required by the fracturing fluid can be obtained without needing chemical crosslinking. The association-type non-crosslinking fracturing fluid based on the thickening agent has the characteristics of simple composition, low residue content, low damage, low friction, shear resistance, temperature resistance and salt resistance and can turn into a new generation of fracturing fluid system for replacing guanidine gum and fracturing fluid thereof.

Description

technical field [0001] The invention belongs to the fields of petroleum engineering and chemical industry, and in particular relates to an associative non-crosslinked fracturing fluid and a preparation method thereof. Background technique [0002] In the petroleum industry, a suitable fluid is injected into the formation under high pressure to provide enough energy to exceed the original formation overlying pressure, resulting in cracks in the formation rock, and the fluid simultaneously carries 20-40 mesh of quartz sand, ceramsite, glass Proppants such as microbeads are transported into fractures, and when the pressure is released, these proppants stay in the newly created fractures, creating new fluid passages, thereby increasing the output of oil and gas wells or enhancing the injection capacity of water wells, that is, hydraulic pressure. Fracture, this fluid is called fracturing fluid. [0003] Fracturing fluid is one of the keys to the success of hydraulic fracturing....

Claims

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Application Information

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IPC IPC(8): C09K8/68C08F220/56C08F220/06C08F220/58C08F226/02C08F212/14
CPCC08F220/56C09K8/68C09K8/88C08F220/06C08F226/02
Inventor 郭拥军罗平亚
Owner SOUTHWEST PETROLEUM UNIV
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