Special heat-salinity-resistant drag reducer for shale gas fracturing and manufacturing technology thereof

Abstract

The invention provides a special heat-salinity-resistant drag reducer for shale gas fracturing. The special heat-salinit-resistant drag reducer is prepared from the following raw materials by mass percent: 20-40 percent of nonionic monomers, 10-30 percent of salinity-resistant monomers, 1-10 percent of an emulsifier, 0.1-0.8 percent of an initiator, 0.1-1.5 percent of sodium bisulfite, 5-20 percent of an organic solvent, 1-3 percent of a phase inversion agent and the balance of deionized water. A manufacturing technology of the special slickwater resistance reducing agent comprises the steps of raw material mixing, modulation and modification, purification for impurity removal and modulation and modification. The manufacturing technology is simple, high in production efficiency and low in production cost, and can effectively reduce the production and application costs of the drag reducer, and meanwhile, the prepared drag reducer is quick in dissolution, low in energy consumption, good in shearing resistance, nontoxic, pollution-free and dust-free, nondestructive to health, good in fluidity, easy to operate, and high in heat-and-salinity resistance. Therefore, on one hand, the application requirements for shale gas exploitation are effectively met, and the exploitation cost is lowered, and on the other hand, damages caused by shale gas resource exploitation to the natural environment and threats caused by shale gas resource exploitation to the health of operators can be effectively reduced.

Description

technical field [0001] The invention relates to a special temperature-resistant, salt-resistant and drag-reducing agent for shale gas fracturing and a production process, belonging to the technical field of chemical preparations. Background technique [0002] At present, in the process of developing shale gas resources, in order to improve the production efficiency, it is often necessary to adjust and transform the gas storage structure of the shale layer, and in the adjustment and transformation of the shale layer structure, the current method is mainly to use the drag-reducing water fracturing Because the drag-reducing water is also called slick water, the current shale gas exploitation technology is also called slick water hydraulic fracturing shale gas exploitation technology, and the performance of slick water is the key to shale gas development. However, in actual use, during slick water fracturing construction, due to the high speed of the booster pump, high friction ...

AI Technical Summary

Problems solved by technology

[0002] At present, in the process of developing shale gas resources, in order to improve the production efficiency, it is often necessary to adjust and transform the gas storage structure of the shale layer, and in the adjustment and transformation of the shale layer structure, the current method is mainly to use the drag-reducing water fracturing Because the drag-reducing water is also called slick water, the current shale gas exploitation technology is also called slick water hydraulic fracturing shale gas exploitation technology, and the performance of slick water is the key to shale gas development. However, in actual use, during slick water fracturing construction, due to the high speed of the booster pump, high friction will be generated, which will increase the movement resistance of slick water and cause slick water The effective working pressure of the slick water is greatly reduced, and in severe cases, the slick water will even deteriorate, which will seriously affect the exploitation of shale gas resources. In view of this situation, the current main method is to add drag reducing agents to the slick water to reduce slippery water. However, most of the currently used drag reducers are imported products with high cost, and most of them are in the form of solid powder or colloid, with slow dissolution rate and poor shear resistance, and are harmful to the human body. It has certain toxicity, heavy pollution, and relatively poor fluidity, so it causes a lot of inconvenience to the actual use. In view of this situation, a new drag reducer and its corresponding production process are urgently developed. Meet the needs of actual production

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