Weighting water-based fracturing drag reducer

Abstract

The invention discloses a weighting water-based fracturing drag reducer. The weighting water-based fracturing drag reducer comprises a base solution and a weighting agent, wherein the base solution comprises the following components in percentage by weight: 0.02%-0.1% of drag reducer, 0.5%-0.1% of conditioning agent and the balance of water; and the weighting agent is one or a mixture of more of ZnCl2, Zn(NO3)2, CuC12 and Cu(NO3)2 in arbitrary proportions; and the drag reducer is an inverse emulsion, and the conditioning agent is a methanol solution of 3 percentage by weight of ethyoxyl non-ionic type fluorocarbon surfactant. The novel weighting material is added to the drag reducer, so that the density of the drag reducer is increased, and the liquid column weight of the drag reducer in a pipeline is increased, thus the construction pressure is effectively reduced, the construction risk is reduced, and the construction success is ensured.

Description

technical field [0001] The invention relates to a water-based fracturing drag reducing fluid in the field of production stimulation and transformation in the development process of oil and gas fields. technical background [0002] The buried depth of deep high-temperature reservoirs is very large. In addition to the high reservoir temperature, high formation pressure coefficients and large closure stress gradients often occur. The construction pressure is usually high when it is transformed, even exceeding the existing equipment. Construction pressure limit. For example, Well Wucan 1 in Tarim Oilfield has a well depth of more than 6,000 m and a formation pressure coefficient greater than 2.0. After calculation, it is found that if a conventional fracturing fluid system is used for fracturing, the operating pressure will reach 103 MPa, exceeding the working limit of existing fracturing equipment. For this type of reservoir, it is necessary to simultaneously reduce the fricti...

AI Technical Summary

Problems solved by technology

[0003] At present, in the process of field use in oil fields, various methods of aggravating fracturing fluids are adopted, generally adding soluble sodium salts and potassium salts. The reason for choosing sodium salts and potassium salts is that the current conventional fracturing fluid system is alkaline, and other Non-sodium and potassium salts will precipitate in the system, which will affect the performance of the liquid, but the ability to add weight to sodium and potassium salts is limited

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