6results about How to "Reduce pumping pressure" patented technology

This invention relates to the field of slickwater technology, specifically to a high-efficiency proppant-carrying slickwater. It comprises a shear-responsive smart thickener and inorganic salts dispersed in an aqueous phase; the smart thickener is composed of ABA-type temperature-ion dual-responsive block copolymers and nano-silica particles with surface-grafted hydrophobic alkyl chains and cationic groups. The slickwater of this invention exhibits ultra-low viscosity and high drag reduction during the pumping stage (low temperature, high shear); upon entering a fracture, the synergistic effect of temperature rise and instantaneous high-speed shear triggers hydrophobic association of the copolymer and interweaving of the nanoparticles, forming a three-dimensional network structure; under the low-shear environment within the fracture, the network structure self-reinforces through ordered reconstruction of ion pairs, achieving high-viscosity proppant carrying. Its core lies in transforming the inherent temperature rise and shear effects of the process into a driving force for constructing a proppant-carrying network, thereby effectively resolving the contradiction between low-friction pumping and high proppant carrying capacity in slickwater volumetric fracturing and significantly reducing reservoir damage.

The application discloses a shotcrete rebound-reducing agent and a preparation method thereof. The shotcrete rebound-reducing agent is prepared from the following raw materials in mass percentage: 15-30% of a quick-setting component, 2-5% of a viscosity-increasing component, 10-15% of a reinforcing component, 2-5% of an anti-freezing component, 1-4% of a stabilizer, and the rest of water; and the viscosity-increasing component is a combination of polyvinylpyrrolidone and modified carboxymethyl cellulose. The prepared shotcrete rebound-reducing agent has the advantages of good sprayability, high hourly strength, good anti-freezing and stability, and the like, can improve the working performance of shotcrete, reduce the content of a quick-setting agent and significantly reduce the rebound rate of shotcrete, and has good economic benefits.

The invention discloses an on-site mixed emulsion explosive for an underground mine upward hole and a preparation method of the on-site mixed emulsion explosive. The emulsion explosive comprises nitric acid, sodium nitrate or urea, water, a compound oil phase, a sensitizer, an accelerant, modified chitosan and sodium carboxymethyl cellulose. The preparation method of the emulsion explosive comprises the following steps: S1, uniformly mixing ammonium nitrate, sodium nitrate, water and a compound oil phase, and emulsifying to obtain an emulsion matrix; s2, preparation of sensitizer liquid: S21, mixing sodium nitrite with water to obtain a first mixed solution; s22, uniformly mixing the modified chitosan with the first mixed solution to obtain a second mixed solution; s23, uniformly mixing sodium carboxymethyl cellulose with the second mixed solution to obtain a sensitizer solution; and S3, separately conveying the accelerant liquid and the sensitizer liquid, and mixing the accelerant liquid and the sensitizer liquid with the emulsion matrix to prepare the emulsion explosive. According to the invention, the problem that the produced emulsion matrix is high in viscosity and difficult to convey due to the pursuit of high viscosity of the on-site mixed emulsion explosive in the use process is solved.

The invention discloses high-lift pump concrete and a preparation method thereof, and belongs to the technical field of building materials. The high-lift pump concrete is prepared from the following raw materials in parts by mass: 400 to 500 parts of cement, 150 to 200 parts of fly ash, 60 to 100 parts of mineral powder, 700 to 750 parts of coarse aggregate, 300 to 400 parts of fine aggregate, 50 to 90 parts of fiber, 1 to 5 parts of retarder, 20 to 25 parts of water reducing agent and 120 to 170 parts of water, the water reducing agent comprises a polycarboxylic acid water reducing agent and sodium lignin sulfonate. According to the designed preparation scheme of the high-lift pumped concrete, the pumping pressure of the concrete can be reduced, the construction performance can be improved, the pipeline blockage phenomenon can be avoided, the later strength development can be promoted, and the high-lift pumped concrete is not prone to drying shrinkage and excellent in comprehensive performance. The concrete raw materials limited by the invention have no compatibility problem, and have good stability.

The invention discloses a compact rock fracturing device and method based on CO2 phase state change. The compact rock fracturing device comprises a compact rock sample with a central through hole, and further comprises an injection module configured to inject fluid into the compact rock sample; the upper sealing assembly and the lower sealing pipe fitting are both arranged in the center through hole, the upper sealing assembly and the lower sealing pipe fitting are oppositely arranged, an open hole section is defined by the upper sealing assembly, the lower sealing pipe fitting and the center through hole, and fluid is injected into the open hole section; the temperature control module comprises a cold control unit and a thermal control unit, and the cold control unit and the thermal control unit are communicated into the open hole section; and the fluid monitoring module is used for monitoring the pressure and temperature of the fluid in the naked eye section. The fluid temperature and pressure alternating effect can degrade the mechanical property of the compact rock sample; the fluid phase state change induces the generation of dominant fracturing fractures, and the two synergistically act to achieve the purpose of strengthening the reconstruction of the compact rock sample.

The utility model discloses a top contact detection limiting mechanism of a tunnel vault filling pipe, which comprises a base, a movable top cover, a spring, a limiting bolt, a sealing ring and a proximity detection switch, the base is fixedly arranged at the top end of the filling pipe, and the movable top cover is movably sleeved on the base and can move up and down; the spring is vertically installed on the base, and the top of the spring makes contact with the movable top cover and provides upward elastic force for the movable top cover. The limiting bolt vertically penetrates through the movable top cover, the bottom of the limiting bolt is fixedly connected to the base through threads, a top cap of the limiting bolt conducts elevation limiting on the movable top cover, a cover hood is further arranged on the movable top cover and covers the limiting bolt, a height space is reserved in the cover hood, and allowance is provided for ejection of the limiting bolt; the proximity detection switch is embedded in the base and used for detecting whether the movable top cover is pressed downwards or not. The device can detect whether the top end of the infusion tube reaches the top surface of a tunnel or not when the infusion tube is driven by the linear driving actuator to move upwards.