50results about How to "Prevent gas blowing" patented technology

The invention relates to a low temperature and low hydration heat cementing concrete system used in the natural gas hydrate layer cementing field. The objective of the invention is to effectively reduce the heat release of the cement hydration, prevent the hydrate from decomposing because of large heat and reduce the harm of the hydrate to the cementing. The whole performance of the cement under the low heat release condition is improved by adding materials which can reduce the whole hydration heat release of the cement using G grade oil well cement as base material. (1) The proper addition of superfine slag with a specific surface area between 6000 and 12000cm2/g can make sure the strength properties of the early and later stage of the cement. (2) The hydration heat is further reduced by adding fly ash with a lower hydration activity. (3) An amount of gypsum component is added so that the cement paste has certain expansion property at a low temperature to prevent the cement paste shrinking at a low temperature. The low temperature and low hydration heat cementing concrete provided by the invention has an obvious effect for reducing the whole cement hydration heat and a good effect for preventing the deep water hydrate decomposition.

The invention relates to a propane-injecting shallow heavy oil reservoir exploitation method. The propane-injecting shallow heavy oil reservoir exploitation method includes the following steps: a horizontal injection and production well network is arranged in a shallow heavy oil reservoir exploitation area, an injection well and a production well are arranged in the oil layers at the same vertical plane position to form an injection and production well pair, the injection well is a horizontal injection well, the production well is a horizontal production well, and the horizontal injection and production well network comprises at least one injection and production well pair; injected steam circulation preheating is carried out simultaneously via the injection well and the production well; after the temperature of the oil layer between the horizontal section of the injection well and the horizontal section of the production well is increased to a predetermined temperature, the injection well and the production well simultaneously stop circulation preheating, propane starts to be continuously injected into the injection well, and the amount of the injected propane is 5000m3/d to 25000m3/d; and the production well starts continuous oil production. The propane-injecting shallow heavy oil reservoir exploitation method has the characteristics of high recovery rate, propane recycling, low exploitation cost, high economic benefit, low energy consumption, low emission, environment-friendliness and the like, and is easy and safe to operate.

The invention belongs to sea deep water complex well cementing which is suitable for low temperature, tending to superficial water-gassed-out. The mineral components and mass percent composition are: 23-45 wt.% of tricalcium silicate, 12-25 wt.% of calcium sulphoaluminate, 15-23 wt.% of dicalcium silicate, 3-10 wt.% of gypsum, 4-8 wt.% of calcium carbonate, and residual celite, calcium aluminate and other microelement. The using process of the deep water complex well cementing includes: adding 0-3 wt.% of coagulant, 0-1.2 wt.% of retarder, 15-45 wt.% of hollow microglobin and water to prepare a low density cement slurry system of 1.35-1.60g/cm3 which has a controllable gelled time and has a perfect right-angle gelling capacity, a set cement volume microdilatancy and develops fast at low temperature. The inventive deep water low temperature complex well cementing has a high early strength, a short curing time, a powerful channeling-preventing ability, and microdilatancy, which provides a powerful guarantee to improve the deep water complex well quality.

The invention provides a device for injecting pulverized coal into an oil layer and an ignition method for in-situ oil combustion and belongs to the field of exploitation through in-situ oil combustion. The device for injecting the pulverized coal into the oil layer comprises an oil pipe arranged in an injection well or a production well, a pulverized coal spray-blowing system arranged on the ground and an injection pipeline, wherein the pulverized coal spray-blowing system is provided with a pulverized coal input port and a spray-blowing port, the spray-blowing port sprays out the pulverized coal, the injection pipeline is connected between the oil pipe and the spray-blowing port of the pulverized coal spray-blowing system, and the pulverized coal sprayed out of the spray-blowing port is delivered to the oil pipe. The device can improve the ignition effect for in-situ oil combustion and can also improve the development effect of the in-situ oil combustion.

A formula for improving the recovery ratio of authigenic CO2 comprises, by mass, 5-15 parts of ammonium bicarbonate, 1-5 parts of bioactive agents, and the balance water which is not beyond 35 DEG C. In use, the formula is directly injected in the stratum and dissolved to generate CO2 through heat of the stratum; when the temperature of the stratum is below 35 DEG C, the CO2 is obtained through composite effect of the heat of the stratum and the bioactive agents. The formula can be applied to the fields of oil field oil displacement, fracturing and well repair, and achieves the purposes of improving the recovery ratio, and promoting fracturing fluid flowing-back. Foams are generated while gas is formed, stability of the foams is high, gas channeling can be effectively prevented, and the formula has the advantages of foam displacement of reservoir oil and foam well killing.

The invention provides a super heavy oil well profile control agent which comprises composition a and composition b, wherein the composition a comprises components in percentage by mass as follows: 0.5%-1% of hydrolysis polyacrylamide, 0.5%-2% of an organic crosslinking agent, 0.1%-0.5% of a heat stabilizer, 0%-1% of a slow gelatinizing agent and the balance of water; the composition b comprises a gas generation agent and a surfactant; the gas generation agent is liquid carbon dioxide or urea; when the gas generation agent is liquid carbon dioxide, the mass ratio of liquid carbon dioxide to the surfactant is (80-100): (6-8); when the gas generation agent is urea, the mass ratio of urea to the surfactant is (70-150): (5-12). The super heavy oil well profile control agent can effectively prevent gas channeling, influence of planar gas channeling on oil displacing is reduced, voidage of the stratum can be effectively compensated, the stratum pressure is increased, the throughput effect of an oil well is improved, and the output per period is increased.

The invention discloses an oil well cement paste self-healing agent suitable for an acid gas pool. The method for preparing the oil well cement paste self-healing agent suitable for the acid gas pool comprises the steps that (1) acid activation treatment and modification treatment are conducted on expanded perlite with the particle size ranging from 80 meshes to 120 meshes; (2) one or more of the self-healing materials such as copper sulfate, silver nitrate, barium hydroxide and lead acetate are mixed with water with the mass ratio of 1:50-100; (3) 10 g to 50 g of the modified expanded perlite is added to 200 mL to 1000 mL of a self-healing solution, so that a modified expanded perlite-seal-healing material mixed solution is prepared; (4) the mixed solution is placed in a spray dryer to be dried for two hours at the temperature of 250 DEGC to 300 DEG C, and then the oil well cement paste self-healing agent is obtained. The oil well cement paste self-healing agent can be adapted to the underground complicated working condition, is good in durability and temperature resistance, and capable of improving the mechanical property of set cement, the long-term sealing integration of acid gas well cement rings is guaranteed, and the production life of a gas well is prolonged.

The invention discloses a combined thermal recovery method for a thickened oil reservoir with a gas cap. According to the method, heating of the top of an oil layer is achieved through a method of igniting the gas cap, and combustion heat of a top air layer is utilized to heat the whole oil layer, thereby reducing viscosity of crude on the contact face between the gas cap and a thickened oil layerand achieving the cross-well communication between a vertical well and a horizontal well; flue gases produced after combustion further reduces the viscosity of the thickened oil and provides energy to the entire oil reservoir. The combined thermal recovery method for the thickened oil reservoir with the gas cap not only achieves the exploitation of the thickened oil reservoir with the gas cap, but also saves the steam injection amount through the combustion of the gas cap, and entirely improves the comprehensive benefits of the thickened oil exploitation in the vertical well and horizontal well in a steam driving stage.

The invention relates to a pure oxygen and diesel combined heat carrier generator system comprising a pure oxygen combined heat carrier generator. The input end of the pure oxygen combined heat carrier generator is connected respectively with a pure oxygen pipeline, a diesel pipeline and a water pipeline. The output end of the pure oxygen combined heat carrier generator is connected with an oil layer through a combined heat carrier delivery pipeline. The combined heat carrier delivery pipeline comprises a pure oxygen combustion chamber (29), a circulating water temperature sensor (30), a heat carrier gasification chamber (31), a heat carrier pressure transmitter (32), a heat carrier temperature sensor (33), a heat carrier safety bypass device (34), and a heat carrier safety emptier (35), wherein the pure oxygen combustion chamber (29), the circulating water temperature sensor (30), the heat carrier gasification chamber (31) and the heat carrier pressure transmitter (32) are connected in sequence through a pipeline. The pure oxygen and diesel combined heat carrier generator system has the advantages that operation cost can be reduced effectively, zero carbon emission and energy-saving emission are achieved, gas channeling caused by increased nitrogen content is prevented, and the system is applicable to the exploration of heavy oil and oil sands by the SAGD technology.

The invention discloses a method for extracting oil by injecting foam air and oxygen-enriched pyrolysis thermochemcial composite air into an oil reservoir in a flooding mode. The method comprises the steps that in the first injection step, a foaming agent is injected into the oil reservoir so as to generate foam; in a second injection step, an oxygen-enriched air mixture is injected subsequently, and ignition is conducted on a stratum; and subsequently, the air is injected for oil displacement production. Large pore paths can be blocked by the foam, water is blocked while oil is not blocked, and hypertonic pore paths are sealed; and since the foam and the air are alternately injected, gas channeling can be effectively prevented, the purposes of modifying and flooding can be achieved, residual oil can be better displaced, communication of areas unswept by injected water is achieved, and the crude oil displacement and sweeping efficiency are improved. The foaming agent is an anionic surfactant with high activity, and can be used for lowering oil-water interfacial tension greatly, improving the wettability of the surface of rock and improving the displacement efficiency of an injectant, and accordingly the purpose of increasing the recovery ratio is achieved. Advantages of the technologies of foam flooding and air flooding are fully achieved, the sweeping coefficient is increased more efficiently, and the displacement efficiency is improved more efficiently.

The present invention provides a compressor and a refrigeration system thereof, wherein the compressor includes: a shell, a lower flange structure arranged in the shell from bottom to top, a first compression cylinder and a second compression cylinder, the first The compression cylinder includes: a cylinder body, a roller and a sliding piece. A sliding piece groove is arranged on the inner wall of the cylinder body. The roller is arranged in the cylinder body. The sliding piece is arranged in the sliding piece groove and cooperates with the roller. There is a first reset part between the slide grooves, a lock groove corresponding to the position of the pin groove is arranged on the slide piece, the end of the slide piece far away from the roller forms a first cavity with the bottom of the slide piece groove, and a second A channel to connect the first cavity with the inner cavity of the housing; a second cavity is formed between the first end of the pin and the sliding piece, and a third cavity is formed between the second end of the pin and the bottom of the pin groove , the technical solution of the present invention solves the problem in the prior art that the capacity-changing cylinder of the compressor is easily overloaded after being unloaded and then restarted.

The invention discloses styrene and acrylate latex and a preparation method and application thereof, and belongs to the field of well cementing materials. The preparation method of the styrene and acrylate latex comprises the following steps of polymerizing of seed emulsion: adding styrene, acrylate, unsaturated acid or salt thereof, a buffer agent, and deionized water into a reactor, leading nitrogen gas, adding an initiator, and reacting for 80 to 100min at the temperature of 60 to 88 DEG C, so as to obtain the seed emulsion polymerizing part; singly dripping the acrylate, and the mixture ofthe initiator, the buffer agent, and the unsaturated acid or salt thereof into a reactor, simultaneously finishing dripping, and warming at the temperature of 80 to 90 DEG C, so as to obtain the styrene and acrylate latex. The seed emulsion polymerizing monomer contains 14% to 75% of styrene and 24% to 85% of acrylate; the soap-free emulsion polymerizing monomer contains 92% to 99% of acrylate; the percentage of the seed emulsion polymerizing part in the total polymer is 5% to 25%. The preparation method has the advantages that the technology is simple, the consumption time is short, the prepared styrene and acrylate latex has good stability, and the properties of cement mortar are greatly improved.

The invention discloses a cement additive and a preparation method thereof. The cement additive comprises the following components, by weight: 15-20 parts of acrylamide, 40-60 parts of xylene, 5-10 parts of organic boron, 10-20 parts of triethanolamine, 10-20 parts of urea, 0.5-2 parts of mirabilite, 3-6 parts of gypsum, 12-30 parts of calcium chloride, 3-10 parts of sodium acetate, and 100-150 parts of water. The additive has the following advantages: when the additive is added into cement, the volume of the additive is expanded, such that cement gas channeling can be effectively prevented, while cement body strength can be improved. The method is simple and feasible; investment is low; and the method is easy to realize.