3results about How to "Avoid early release" patented technology

The invention provides a biodegradable ammonium persulfate coating gel breaker for fracturing operation and a preparation method of the biodegradable ammonium persulfate coating gel breaker. The preparation method comprises the following steps: determining a mass ratio R of rosin glyceride to ethyl cellulose according to a target reservoir temperature T, and calculating a coating weight gain ratio coefficient K and the total mass of a coating material according to target delayed gel breaking time t; preparing a core material ammonium persulfate into a water phase, and emulsifying in an oil phase to form a reversed-phase microemulsion; a gradient interface deposition method is adopted, a coating solution A prepared from rosin glyceride and part of ethyl cellulose and a coating solution B prepared from the remaining ethyl cellulose are dropwise added in sequence, and a coating material is sequentially deposited on a core material liquid drop interface through pressure reduction to form a compact bottom layer and a slow-release main body layer; according to the invention, the coating layer is biodegradable, chlorine-free and corrosion-free, through the cooperation of the material ratio and the process, the accurate and controllable delay of the gel breaking time at high temperature is realized, the reservoir is effectively protected, and the fracturing effect is improved.

The utility model relates to a drinking food gas pressure detection device, and belongs to the technical field of gas pressure detection. The device mainly comprises a supporting table, a stand column, a sliding block, a mounting block, a locking bolt, a pressure gauge, a puncture needle, an exhaust valve, a shear type lifting mechanism, a bottle support and a knurled handle. The shear type lifting mechanism and the bottle support are matched to stably fix a beverage bottle at a detection position, carbon dioxide gas in a beverage enters the carbon dioxide containing cavity through the puncture needle for pressure detection, the problem that carbon dioxide is released in advance in a hand-cranking mode is avoided, it is guaranteed that a measurement result is closer to a true value, and the sealing ring guarantees the sealing performance of the device; the surface of the knurled handle is provided with anti-slip lines, so that a worker can conveniently hold the knurled handle by hand to lift the whole device together with the beverage and shake up the carbonated beverage, the carbon dioxide is more fully released, and the detection precision is improved.

The application discloses a kind of concrete internal curing agent for high-temperature underground chamber and its preparation method, belong to concrete material technical field.The internal curing agent is composed of sealing film liquid and superabsorbent polymer, sealing film liquid is compounded by epoxy modified polyurethane emulsion, nano silicon dioxide, carboxyl-containing acrylate copolymer, temperature-sensitive polyether polyol and coupling agent in proportion, form the core-shell structure with sealing film liquid as shell, SAP as core, with good high-temperature resistance and alkali resistance.The internal curing agent does not affect the working performance of concrete, in the high-temperature environment of 30~90 DEG C, when the hydration process of cement causes the pH value of pore solution in concrete to rise, the temperature of concrete rises and internal water shortage occurs, sealing film gradually ruptures under the synergistic effect of high temperature and high alkali, releases the water stored by SAP, provides the required free water for the continuous hydration of cement in concrete, effectively improves the strength and durability of concrete under high-temperature conditions.