Sewage online concentrated fracturing fluid and preparation method thereof

Abstract

The invention provides a sewage online concentrated fracturing fluid and a preparation method thereof. The sewage online concentrated fracturing fluid comprises the following components in parts by weight: 30-35 parts of polyacrylamide; 1 to 2 parts of chitin; 2.5 to 3 parts of an EDTA-4Na; 1 to 2 parts of chitosan; 1-2 parts of sodium alginate; 0.5 to 1 part of ethylene diamine disuccinate sodium; 0.5 to 2 parts of glucose; 0.5 to 1 part of rhamnolipid; 0.1 to 0.3 part of sodium polyaspartate; 0.1 to 0.3 part of carbon quantum dots; 2 to 3 parts of diacetone alcohol; 35-52 parts of an ethylene glycol solution; 2 to 3 parts of polyoxyethylene (20) sorbitan monolaurate; 3 to 4 parts of polyoxyethylene (80) sorbitan monolaurate; and 4-5 parts of sorbitan fatty acid ester. Different stratum produced water and different temperature online liquid preparation can be adopted, low-temperature and high-temperature gel breaking is thorough, site construction is simple, construction seasons are not limited, and the application range is wide.

Description

technical field [0001] The present application relates to the field of fracturing fluid technology, in particular to an online concentrated fracturing fluid for sewage and a preparation method thereof. Background technique [0002] In the process of oil and gas exploration and development, hydraulic fracturing technology plays a vital role. At present, guar gum fracturing fluid system is commonly used in hydraulic fracturing. The guar gum system has problems such as complex construction process, long time for liquid preparation, waste of raw materials, and incomplete gel breaking. [0003] The invention patent with authorized notification number CN106167698B discloses an on-line fracturing fluid and its preparation method. It has the characteristics of temperature resistance and shear resistance, low viscosity of the flowback liquid, and wide application range, but there are still the following deficiencies: [0004] 1. The fracturing fluid is composed of agents A and B. I...

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Problems solved by technology

[0004] 1. The fracturing fluid is composed of agents A and B. In this way, at least two pumps must be prepared at the construction site, and there are also cases where the dosing ratios of the two agents are different. The accuracy of on-site dosing is not easy to control, resulting in unstable cross-linking Case;

[0005] 2. The fracturing fluid can only be mixed with clean water at normal temperature, resulting in a waste of clean water resources and cold damage to oil wells in low-temperature reservoirs. Currently, the purchase cost of clean water for fracturing in oil fields is tens of yuan / m 3 It not only wastes water resources, but also increases the cost of fracturing, and its application is greatly restricted in areas where clean water is scarce;

[0006] 3. The storage environment temperature of the fracturing fluid should not be too low (it will cause solidification if it is too low), so it can only be mixed at room temperature, which makes it difficult to mix fluid in winter construction, further restricting the fracturing construction

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