Application of thermal tackifying emulsion polymer, and fracturing fluid sand carrying agent and slickwater drag reducer based on thermal tackifying emulsion polymer

Abstract

The invention provides a fracturing fluid sand-carrying agent and a slickwater drag reducer based on a thermal tackifying emulsion polymer, and the thermal tackifying emulsion polymer is applied to the process of increasing the yield of petroleum and natural gas through hydraulic fracturing and is used for preparing the fracturing fluid sand-carrying agent or the slickwater drag reducer on site. The thermal tackifying emulsion polymer is obtained by polymerizing a temperature-sensitive macromolecule, an anionic monomer and an acrylamide monomer, and the temperature-sensitive macromolecule is apolyoxyethylene-polyoxypropylene-polyoxyethylene triblock polymer. According to the invention, the defects that a conventional fracturing fluid system needs to be dissolved and crosslinked in advance, and the fluid preparation process is tedious are overcome, and meanwhile, the defect that the sand carrying performance or the drag reduction efficiency of a traditional fracturing fluid or the slickwater drag reducer becomes poor due to thermal thinning is overcome.

Description

technical field [0001] The invention belongs to the technical fields of oilfield chemistry and petroleum and natural gas fracturing production stimulation, and particularly relates to the application of thermal viscosity-increasing emulsion polymer as a suspended sand-carrying agent in fracturing fluid and as a drag reducer in slippery water. Background technique [0002] Hydraulic fracturing is an important technical measure for increasing production of oil and natural gas wells and increasing injection of water injection wells. It is not only widely used in low permeability oil and gas reservoirs, but also has achieved good results in stimulation of medium and high permeability oil and gas reservoirs. This technology uses surface high-pressure pumps to inject high-viscosity liquid with proppant such as quartz sand or ceramsite into the well at a displacement far exceeding the absorption capacity of the formation, and build up high pressure at the bottom of the well; when th...

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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the prior art, to provide the use of heat-increased emulsion polymers, and to provide fracturing fluid sand-carrying agents and slick water drag reducers based on the emulsion polymers, so as to solve the needs of conventional fracturing fluid systems Pre-dissolution, cross-linking, and cumbersome liquid preparation process defects, while overcoming the traditional fracturing fluid or slick water drag reducer due to "thermal thinning" (viscosity decreases with increasing temperature), which leads to poor sand-carrying performance or drag reduction efficiency lack of

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