39results about How to "Good temperature resistance and shear resistance" patented technology

The invention discloses a single-component full-function fracturing fluid additive and a preparation process thereof. The process comprises the following steps: mixing ethylene glycol, isopropanol, 1-butanol, 1-hexanol and 1-octanol, and conducting heating to uniformly disperse the mixture to obtain a water-based dispersant; adding a high-molecular polymer thickening agent and an auxiliary agent into a water-based dispersing agent, wherein the auxiliary agent is one or more of a clay stabilizer, a discharge aiding agent, a drag reducer, an anti-emulsifying agent, a filtrate reducer, a corrosion inhibitor and a sterilizing agent; conducting stirring at a high speed to obtain suspension; and slowly stirring the suspension at a low speed, conducting cooling, and collecting a suspension sample when the temperature of the suspension is reduced to room temperature. The additive has the characteristics of good temperature resistance, shearing resistance, salt resistance, sand suspension and the like. The problems that an existing fracturing fluid system is serious in stratum pollution, difficult to dissolve, single in function, poor in performance and the like are solved, and the additive has the advantages of being good in use performance, environmentally friendly, capable of saving energy and reducing consumption and can be used as a clean and environment-friendly single-component type full-function fracturing fluid additive.

The invention relates to a carboxymethyl hydroxypropyl guanidine gum fracturing fluid which is used for fracturing reformation of a high-temperature and low-permeability reservoir. The carboxymethyl hydroxypropyl guanidine gum fracturing fluid comprises the components by weight percent: 0.25-0.6% of carboxymethyl hydroxypropyl guanidine gum, 0.2-0.6% of cross-linking agent, 0.2-0.4% of cross-linking regulator, 0.5-1% of clay stabilizer, 0.05-0.1% of bactericidal preservative, 0.2-0.5% of discharge aiding agent, 0.0001-0.15% of ammonium persulfate and the balance of water. A preparation method of the fracturing fluid comprises the steps of: adding clear water into a large tank, adding the carboxymethyl hydroxypropyl guanidine gum into the large tank under the stirring condition, and then sequentially adding the clay stabilizer, the discharge aiding agent, the cross-linking regulator and the bactericidal preservative into the large tank; and stirring for 10 minutes until the concentration or the viscosity of liquid at the upper part and the lower part of the large tank is uniform and consistent. During fracturing construction, the cross-linking agent and gel breaker are added into the large tank according to the requirement. The carboxymethyl hydroxypropyl guanidine gum fracturing fluid has the effects of being suitable for the reservoir temperature of 80-200DEG C, reducing the residue of the fracturing fluid and the construction friction, and meeting the demand of fracturing reformation of the high-temperature and low-permeability reservoir.

The invention discloses a multi-lithologic fracturing crack test method, which includes the following steps: (1) rock matrix production: according to different rock mechanical parameters, the mass ratios of cement, quartz sand and water are prepared to simulate shale respectively. , cuboid sheet of coal rock and limestone; (2) simulation of fracture system: in the process of making rock sheet, the pre-set paper sheets are used to simulate coal rock, shale bedding and coal rock cleavage; (3) sample combination; ( 4) Sample drilling: According to the characteristics of the horizontal well and vertical well, drill a counterbore with a length of 16 cm and a diameter of 14 mm on the surface of the sample along the direction parallel or perpendicular to the bedding, cement the simulated wellbore, and reserve the lower part. 2cm open-hole section; (5) select the type of proppant; (6) perform the Gaza process; (7) evaluate the conductivity of the proppant. Therefore, the present invention is a simulation method capable of quantitatively and accurately predicting the true propagation trajectory of the staged fracturing fractures in horizontal wells.