37results about How to "Reduce pumping pressure" patented technology

The invention relates to a temperature-sensitive plugging cement paste for oil well cementation and a preparation method of the temperature-sensitive plugging cement paste. The temperature-sensitive plugging cement paste for oil well cementation contains the following components in parts by weight: 100 parts of cement, 0-55 parts of lightening admixture, 1-20 parts of fluid loss agent, 0.1-10 parts of set retarder, 0-20 parts of filler, 0.1-10 parts of defoaming agent, 0.1-10 parts of temperature-sensitive shape memory polymer particles, 0-10 parts of fruit husks, 1-10 parts of rubber powder,1-10 parts of vermiculite and 20-150 parts of water. The temperature-sensitive plugging cement paste for oil well cementation, disclosed by the invention, has a good effect on plugging cracks with different sizes and has the advantages such as good plugging effect, relatively low pumping pressure and no influences to thickening time and later strength development of the cement paste for well cementation as comparison with a plugging paste made of a single inorganic material.

The invention discloses a plasticity stabilizer for mechanical spraying mortar. The plasticity stabilizer comprises the following ingredients in parts by mass: 20-22 parts of a retarder, 20-22 parts of a water reducer, 12-14 parts of cellulose ether, 0.5-1 part of a thixotropic agent, 25-30 parts of bentonite and 15-20 parts of attapulgite. The plasticity stabilizer is applicable to the mechanicalspraying mortar, and can improve thixotropy, water retention, pumpability and storability of the mortar.

The invention discloses a pumping concrete admixture capable of improving pumpability and a preparation method thereof. The admixture comprises the following raw materials (by weight): 70-80 parts ofcopper tailings, 20-30 parts of granulated blast-furnace slag, and 0-0.1 part of an additive. The additive is composed of triethanolamine, polyvinyl alcohol and a polycarboxylic plasticizer. The copper tailings from wet mill concentration contain lots of fine particles of less than 5 um. Through processes such as surface modification, drying, grinding, etc., the concrete admixture capable of effectively reducing bleeding and segregation of pumping concrete and remarkably enhancing pumpability can be prepared. Solid wastes can be largely utilized, the cost of the product is low, and the economic value is high. Thereby, the preparation method accords with the national circular economy and sustainable development policy.

The invention disclosesan oil phase for a medium-low temperature sensitization process emulsion explosive and prepared from a coal-to-oil intermediate product. Theoil phase comprises the coal-to-oil intermediate product, a wax material, an SP-80 emulsifier and a polymer surfactant according to a weight ratio of (45-55): (15-20): (25-30): (5-10); and the four materials are metered and added into a mixing tank to be heated, stirred and mixed for 40-70 min, the temperature is controlled to be 75 +/-5 DEG C, and the materials are mixed to form the composite oil phase, wherein the coal-to-oil intermediate product is a semi-finished product in the coal-to-oil production process, namely the coal-to-oil intermediate product. The oil phase has the advantages that no other oil phase material is added, various performance indexes of the produced emulsion explosive can completely reach the national standard, and the product has the advantages of good fluidity, low pumping pressure and the like. The composite oil phase has the advantages of higher calorific value, favorable safety performance, convenience in use, low price, wide sources of various raw materials and higher economic benefit.

The invention discloses a fracturing well completion method. The method is applied to the reservoir exploitation of low permeability oil and gas reservoirs, tight oil or shale oil and the like. The method comprises the steps that a light drive pipe is adopted to perform fracturing, a spile bridge plug is prefabricated in a well shaft above a production layer using a constant oil pipe after fracturing is conducted, the bridge plug is used for isolating the reservoir in pump lowering well completion or subsequent pump inspection operation process to prevent external liquid from contacting the reservoir, and a sealing plug at the bottom of a production column is used for switching on and off a production pipeline in the bridge plug. Fracturing needs to be conducted on the low permeability oiland gas reservoirs, the tight oil or the shale oil to obtain industrial oil gas flow, if conventional operation is conducted, well killing needs to be conducted in the pump lowering or pump inspection operation process, well killing liquid in the well shaft easily enters a stratum to damage the stratum, and the yield after fracturing is conducted is reduced. If pressurizing operation is conducted, the problems of long construction period and high cost exist, and an electric pump cannot be lowered during pressuring operation. The method overcomes the defects of the conventional operation and the pressurizing operation, and efficient exploitation of the low permeability oil and gas reservoirs is achieved.

The invention relates to a viscosity reduction type liquid phase composition, a preparation method and application thereof, in particular to a viscosity reduction type water reducing agent applied tosimilar construction modes such as tubular piles and sleepers, a preparation method and application thereof, and belongs to the technical field of concrete admixtures. The invention provides a liquidphase composition, which comprises the following components: (1) one or two or more polymers P selected from polymers of polyether macromonomers and micromonomers; and (2) one or two or more water reducing agents Q selected from a water reducing type polycarboxylate water reducing agent, a slow release type polycarboxylate water reducing agent and a slump retaining type polycarboxylate water reducing agent; wherein the proviso is that the liquid phase composition comprises two or more polymers P or two or more water reducing agents Q. The liquid phase composition disclosed by the invention canbe widely applied to multiple fields of commercial concrete of pumping type tubular piles, high-strength concrete pumping and high stone powder machine-made sand, and meets the requirements of different application fields such as tubular piles or sleepers on the performance of concrete admixtures.

The invention discloses a self-compacting concrete and a preparation method thereof. The self-compacting concrete is prepared from 112 to 154 parts of cement, 95 to 125 parts of modified mineral powder, 75 to 85 parts of coal ash, 800 to 1100 parts of broken stone, 195 to 233 parts of coarse sand, 455 to 580 parts of fine sand, 110 to 150 parts of water and 8 to 12 parts of an additive. The concrete is low in water-binder ratio, high in strength, easy to operate, small in pumping pressure and long in pumping distance, and the compactness and compressive strength of the concrete are improved.

The invention provides a packer which comprises a packing part and a well washing assembly connected with the packing part, the well washing assembly comprises a well washing sleeve assembly and a concentric adjusting cylinder, the well washing sleeve assembly is connected with the packing part, a liquid inlet hole is formed in the well washing sleeve assembly, and the well washing assembly is controlled by an electric control mechanical arm; the concentric adjusting cylinder is movably arranged in the well washing sleeve assembly in the axial direction of the well washing sleeve assembly, the concentric adjusting cylinder is provided with a sealing position for shielding the liquid inlet hole and a liquid inlet position for avoiding the liquid inlet hole, and the outer wall of the concentric adjusting cylinder is in threaded fit with the well washing sleeve assembly so that the concentric adjusting cylinder can be screwed in and screwed out of the well washing sleeve assembly; according to the packer, on one hand, the problem of high-pressure differential separate injection is solved, on the other hand, the pump pressure for well washing is reduced, the well washing displacement is improved, separate injection of a well with large interlayer pressure difference (within 15 MPa) can be met, meanwhile, a spring structure of a common high-pressure-difference well washing packer is omitted, and the service time of the packer is prolonged.

The invention discloses a bidirectional gas valve kit for a sealed cabin of an underwater robot and gas a nozzle matched therewith. The bidirectional gas valve kit comprises a ventilating bolt A, a ventilating bolt B, a plug and a nut. The ventilating bolt A is mounted on a cover of the sealed cabin through the nut, the lower end of the ventilating bolt A is located outside the cover of the sealedcabin and the lower end of the ventilating bolt A is located in the cover of the sealed cabin, and the lower end of the ventilating bolt A is connected to the ventilating bolt B through a thread; andthe plug is mounted at the upper end of the ventilating bolt A. The bidirectional gas valve kit can restore quickly by means of deformation of a spring at the moment of being taken away after suckingand pressurizing the sealed cabin. A valve element of the ventilating bolt B is ejected to an upper cover by the spring to isolate the cabin and outside, so that air backflow during suction or pressurizing due to pressure difference between the indie and outside of the cabin is avoided, and therefore, it is closer to an ideal condition of sucking and pressurizing the sealed cabin. The bidirectional gas valve kit sucks and pressurizes the sealed cabin at one step, so that the maintenance and preparation work efficiency of the underwater robot is improved.

The invention relates to a moderate sand adding, pressurizing and acid fracturing method for improving the fracture-vug type reservoir transformation effect. The moderate sand adding, pressurizing and acid fracturing method sequentially comprises the following steps of (1) establishing a target reservoir artificial fracture model, calculating to obtain the average fracture width of the artificial fracture model in a reservoir, taking 1/3 of the average fracture width as the upper limit value D of the particle size of a propping agent, and measuring the safe sand adding concentration R when the particle size of the propping agent is D; (2) determining a critical net pressure increase value of a natural fracture in the target reservoir with acid fracturing started; and (3) carrying out sand adding, pressurizing and acid fracturing construction on the target reservoir. According to the moderate sand adding, pressurizing and acid fracturing method, based on the characteristic that the net pressure is rapidly increased after sand is added into the fracture-vug type reservoir, a pump injection program is dynamically adjusted, a scheme is optimized in real time, residual acid after acid fracturing and the propping agent are transported to the far end of a fracture together, a near-end acid etching support and a far-end propping agent support are formed, the flow conductivity of a seepage channel in an acid fracturing affecting range is enhanced, the mining efficiency of a fractured-vuggy oil and gas reservoir is improved, and wide market application prospects are achieved.

The invention provides a ceramsite floating restraining and resistance reducing agent and a method for reducing the floating degree of ceramsite in pumped ceramsite concrete. A method for detecting the ceramsite floating index for representing the floating degree of the ceramsite is provided, a reverse vibrating treatment measure and a reverse secondary hitting method are adopted, operation is easy and fast, and the result reliability is high. According to the ceramsite floating restraining and resistance reducing agent and the method applying the ceramsite floating restraining and resistance reducing agent to reducing the floating degree of the ceramsite in the pumped ceramsite concrete, pumping resistance can be effectively lowered, the pumping and lubricating effect can be improved, the pumping speed can be increased, pumping pressure can be lowered, and the percent of the slump of the ceramsite concrete doped with the ceramsite floating restraining and resistance reducing agent to the slump of ceramsite concrete without being doped with the ceramsite floating restraining and resistance reducing agent is not lower than 90%.

The invention belongs to the technical field of washing machines, and particularly discloses an automatic putting device and a washing machine. The automatic feeding device comprises a distribution box, the distribution box is provided with at least one liquid storage cavity, a liquid outlet is formed in the bottom of the side wall of one end of the distribution box, and the liquid outlet is communicated with the liquid storage cavity; the pumping unit is arranged at one end of the distribution box, and the pumping unit comprises a liquid suction pipe arranged at the bottom of the pumping unit; when the distribution box is separated from the pumping unit, the liquid outlet is sealed by the unsealing assembly, and when the distribution box is matched with the pumping unit in place, the unsealing assembly is far away from the liquid outlet, and the liquid suction pipe extends into the liquid storage cavity in a sealed mode to be communicated with the liquid storage cavity. The washing machine comprises the automatic putting device. According to the automatic putting device and the washing machine, the structure of the automatic putting device is simplified, and the cost of the automatic putting device and the washing machine is reduced.

The invention discloses an oil phase prepared from a coal-to-oil intermediate product for high-temperature sensitization process emulsion explosive and a preparation method of the oil phase. The oil phase is composed of the coal-to-oil intermediate product, a wax material, an SP-80 emulsifier and a polymer surfactant according to a weight ratio of (50-55):(12-17):(18-22):(5-10). The four materials are metered and added into a mixing tank to be heated, stirred and mixed for 40-70 min, the temperature is controlled to be 75+/-5 DEG C, and mixing is carried out to form the compound oil phase; and the coal-to-oil intermediate product is a semi-finished product in the coal-to-oil production process, namely a coal-to-oil intermediate product. The invention has the advantages that: no other oil phase material is added, various performance indexes of the produced emulsion explosive can completely reach the national standard, and the product has the advantages of good fluidity, low pumping pressure and the like. The composite oil phase has the advantages of higher calorific value, favorable safety performance, convenience in use, low price, wide sources of various raw materials and higher economic benefit.