Long-carbon-chain amide glycine betaine clean fracturing fluid and preparation method thereof

Abstract

The invention relates to long-carbon-chain amide glycine betaine clean fracturing fluid and a preparation method thereof. The glycine betaine amphiprotic surface active agent long-carbon-chain (more than 18 carbons) amide glycine betaine is used as a main agent, the carbon chain of the glycine betaine is long, the glycine betaine is dissolved in the water and is likely to form gel after being stirred, so that the fracturing fluid is good in viscosity. In addition, the clean fracturing fluid by adopting the long-carbon-chain (more than 18) amide glycine betaine as the main agent adsorbs less rock stratum, the consumption of the surface active agent is effectively reduced, the calcium resistance is strong, the gel is thorough to break, no residue exists, and the harm on the stratum is small. The prepared long-carbon-chain amide propyl glycine betaine clean fracturing fluid can be well applied to an oil field and plays an important role in increasing the yield of the oil-gas field.

Description

[0001] Field: [0002] The invention relates to a preparation method of a long carbon chain (18 and above) amide betaine type clean fracturing fluid, and evaluates the clean fracturing fluid. technical background: [0003] As the development of oil and gas field resources becomes more and more difficult, improving fracturing technology has become the main measure for increasing production and injection of oil and gas reservoirs. As an important part of fracturing technology, fracturing fluid plays an important role in increasing production of oil and gas fields. For a long time, the adsorption and damage of fracturing fluid to the formation have been the difficulty and focus of research. Water-based fracturing fluids prepared from natural vegetable gum, cellulose, and synthetic polymers have a large amount of adsorption during the fracturing process, and the gel is not broken thoroughly. cracking effect. [0004] At present, clean fracturing fluids with good gel-breaking ab...

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Problems solved by technology

The fracturing fluid has good temperature resistance, sand-carrying performance, and thorough gel breaking, but its anti-calcium ability is not strong, and it is easy to form precipitation with divalent cations in water, reducing the fracturing effect

[0006] Literature (Liu Guanjun, Li Xiaorui, Ding Li, etc. Oilfield Chemistry, 2012, 29(3): 275-277.) prepared CHJ clean fracturing fluid with anionic surfactant as the main agent and KCl as the auxiliary agent. Low surface tension and interfacial tension, but easy to form precipitation with formation water, causing blockage

[0007] Literature (Wang Junwei. Contemporary Chemical Industry, 2012, 41(2): 133-136.) prepared a clean fracturing fluid with cationic surfactant as the main agent and organic acid sodium salt as the auxiliary agent, with high viscosity and good antibacterial performance , but the amount of adsorption on rocks is large, which increases the amount of surfactant and increases the cost

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