162 results about "Carbon dioxide flooding" patented technology

The invention provides a visualization microscopic experimental device and a visualization microscopic experimental method for displacing super heavy oil by using high-temperature high-pressure carbon dioxide, and belongs to the technical field of oil production. The device comprises a model clamper clamping a microscopic visual model, a replacement system, a back pressure system, a confining pressure system, a pressure monitoring system, a temperature control system and an image acquisition system. The device can control temperature and pressure simply and conveniently, has a small use space, is superior in safety performance, is simple and convenient to operate, can accurately simulate an oil reservoir actual condition, can clearly observe oil-gas action changes during carbon dioxide displacement in real time under a visual condition, and has very important significances for researching a precipitation law of asphaltene, the influence of the precipitation law on the recovery ratio, and the widespread use and promotion of a carbon dioxide displacement experiment in the petroleum industry.

The invention belongs to the technical field of the chemicals in an oil field, which discloses a temperature-resistant salt-tolerant foaming agent carbon dioxide flooding profile control and a preparation method thereof. The foaming agent comprises 15-30% of anion-nonionic surfactant host, 6-20% of nonionic assistant foaming agent, 2-5% of organic micromolecule foam stabilizing agent and 50-77% of water. The preparation method for the temperature-resistant salt-tolerant foaming agent carbon dioxide flooding profile control comprises the following steps of: adding the anion-nonionic surfactant host and water into a reaction kettle in sequence; heating to 40-60DEG C, stirring and dissolving; then adding the nonionic assistant foaming agent; after the nonionic assistant foaming agent is dissolved, continuing to add the foam stabilizing agent to stir; and evenly dissolving to obtain the product. The foaming agent disclosed by the invention is suitable for the carbon dioxide flooding plugged channeling profile control under the geological conditions that temperature is not higher than 110DEG C, and the degree of mineralization is not higher than 150000ppm.

The invention provides an omnibearing coproduction system and method by utilizing coal grading. A standby coal system is respectively connected with a lump coal pyrolysis system and a pea coal pyrolysis system; a gasification system uses air as an input, semicoke generated by the pea coal pyrolysis system as a raw material, and generated gasified coal gas as a heat carrier of the lump coal pyrolysis system; lump coal pyrolysis oil gas generated by the lump coal pyrolysis system is used as a heat carrier of the pea coal pyrolysis system, part of generated lump coke is output as metallurgical coke, and the rest lump coke is used as a raw material for preparing carbide; pyrolysis coal gas generated by the pea coal pyrolysis system enters a crude gas treatment system, generated pyrolysis tar is used for hydrogenation grading, and generated semicoke is respectively used as semicoke for power generation and semicoke for gasification; and the crude gas treatment system uses pyrolysis coal gas generated by the pea coal pyrolysis system as a raw material, generated recovery waste heat is applied to a waste heat boiler of a power generation system, and generated carbon dioxide enters a carbon dioxide displaced coal gas system.

The invention relates to an improved carbon dioxide drive oil production method which is applied to oil production in oil fields. The invention is characterized in that A. carbon dioxide is injected into a gas injection well; and B. under the condition of continuous injection of carbon dioxide, peripheral production wells are opened for production and closed discontinuously. In the period of closing the well, the pressure of an oil pool at the periphery of the gas injection well raises, and when the pressure raises to a certain extent, the production wells are opened for production; with the production of the opened production wells, the pressure of the oil pool at the periphery of the gas injection well decreases and when the pressure decreases to a certain extent, the production wells are closed; and the above steps are repeatedly circulated. The method has the effects that the drive oil effect can be improved and the recovery ratio of the oil pool is improved; and when the pressureraises, part of carbon dioxide can be dissolved into the crude oil; when the pressure decreases, the carbon dioxide can be separated from the crude oil so as to form small bubbles and the volume of the crude oil is obviously expanded compared with the volume of the crude oil when the carbon dioxide is not separated. As the carbon dioxide is injected continuously, the expanded crude oil expands todownstream, thus driving the downstream crude oil to flow to the production wells.

The invention provides an oil field carbon dioxide driving extraction gas carbon dioxide separating recovery system. The oil field carbon dioxide driving extraction gas carbon dioxide separating recovery system comprises an oil gas separating tower, a first compressor, a cooler, a condensation filter, a heat exchanger, an activated carbon adsorption bed, a particle filter, a heater, a second compressor and a membrane separation device. According to the oil field carbon dioxide driving extraction gas carbon dioxide separating recovery system, on basis of arrangement of the oil gas separating tower, the first compressor, the cooler, the condensation filter, the heater exchanger, the activated carbon adsorption bed, the particle filter, the heater, the second compressor and the membrane separation device, carbon dioxide gas coarse-fine separation from high carbon dioxide concentration extraction gas can be achieved, and the system is suitable for single well extraction gas carbon dioxide separation and applied to separating recovery of carbon dioxide in oil field small and medium-scale extraction gas.

The invention relates to the technical field of oil extraction of oil fields, in particular to a diversified carbon-dioxide flooding oil extraction method. By adjusting parameters including minimum mixed-phase pressure, injection ratio, injection pressure, injection speed and the like of liquid carbon dioxide and water and utilizing alternative injection and flooding of the carbon dioxide and the water to perform crude oil extraction, the oil extraction speed and the recovery efficiency are improved.

The invention discloses an extraction method for coal bed gas in a composite old mined-out area formed through a lower tool post method. The method comprises the steps that a horizontal well is constructed at a middle rock layer between an upper old mined-out area and a lower old mined-out area, extraction is carried out, and the coal bed gas extraction amount within the unit time is recorded as Q1; when the extraction amount is decreased to be below 10-20% of Q1, fracturing is carried out for extraction again, and the coil bed gas extraction amount is recorded as Q2; when the extraction amount is decreased to be below 10-20% of Q2, fracturing is carried out again, and the extraction amount is recorded as Q3; when the extraction amount is decreased again to be 10-20% of Q3, carbon dioxide displacement is carried out; then, extraction is carried out again and not stopped until the extraction amount is decreased to 6 m<3>/min. By means of the method, the problems that only a ground vertical well drilling method is adopted for extracting the old mined-out area in the prior art, the effect contact area of an extraction drilling well and an old mined-out area storage layer is small, and the extraction range is limited are solved; sources near the upper old mined-out area coal bed layer are extracted together with lower old mined-out coal bed gas, and the cost is saved.

The invention relates to the technical field of oil-gas field development and carbon dioxide underground storage, in particular to a device and a method for surveying a migration law of carbon dioxideduring carbon dioxide flooding and sequestration. The device comprises an injection system, a seal cavity clamping system and an information collection system; a formation condition is simulated inside the seal cavity clamping system, and an injection well and producing wells communicating with the bottom of a formation are arranged over the seal cavity clamping system; the injection system is connected with the seal cavity clamping system and injects a certain amount of carbon dioxide, and the producing wells are used for discharging crude oil to the outside; and the information collection system includes a gas detector and an information data processing computer, and the gas detector and the information data processing computer are in signal connection. The migration law of carbon dioxide can be simulated and obtained, and real-time plugging is performed when the diffusion range of carbon dioxide reaches a leakage threshold value; and a plugging technology is evaluated and has important significance in leakage prevention and sequestration of carbon dioxide in practical production.

The invention provides a fleeing proof agent for the carbon dioxide flooding of oil reservoirs with ultra-low permeability and the application of the fleeing proof agent. The invention is characterized in that: the main agent of the fleeing proof agent is the amine substance of organic compounds; the fleeing proof agent comprises at least one amine substance and a release agent; the release agent is the ethanol comprising a certain amount of water, a hydrocarbon substance or nitrogen; the release agent is used to prevent the chemical reaction caused by the premature contact between the amine and the carbon dioxide. The invention is suitable for the gas channeling inhibition during the carbon dioxide flooding process for oil reservoirs with ultra-low permeability. The invention has the advantages that: the fleeing proof agent mainly block the gas channeling channel by the salt precipitation generated by the reaction between the carbon dioxide and the amine; the generation time of the salt precipitation is controlled by the injection volume of the release agent; the swept volume displaced by the carbon dioxide is enlarged, and the improvement of the economic benefit of carbon dioxide flooding is favored.

The invention provides a substance balance method for predicting carbon dioxide flooding oil reservoir indexes. The substance balance method for predicting the carbon dioxide flooding oil reservoir indexes comprises the following steps of: 1, giving application conditions of a carbon dioxide flooding substance balance equation; 2, building a substance balance equation applicable to the carbon dioxide flooding; 3, storing oil reservoir parameters and determining a calculation parameter; 4, calculating the parameters of the corresponding time period, wherein the parameters of the corresponding time period include the oil yield and the gas injection volume; and 5, using the parameters obtained through the calculation in the fourth step to determine the carbon dioxide flooding oil reservoir indexes such as the injection-production ratio and the recovery percent. The substance balance method for predicting carbon dioxide flooding oil reservoir indexes has the advantages that the substance balance equation which considers the compressibility of the oil reservoir rock fluid and is applicable to the carbon dioxide flooding is built; an application method of the substance balance equation is given; and an effective method is provided for predicting the carbon dioxide flooding oil reservoir indexes.

The invention discloses a pressure vessel for CO2 displacement and pressure reduction combined mining of hydrates. The pressure vessel comprises a kettle body, a piston, a kettle lid and a support, wherein the piston is in sealed fit with the inner wall of the kettle body and can move up and down; the kettle lid is connected and arranged at the top of the kettle body; the support is arranged at the bottom of the kettle body in a supporting manner; a pressure detection port, a gas inlet/outlet and a temperature detection port which can be connected to an inner cavity of the kettle body are arranged on the kettle lid; a micro-porous filter is mounted at one end, which is close to the kettle lid, of the inner cavity of the kettle body; and a temperature sensor and a one-way valve are arranged on the piston. The pressure vessel is simple in structure and convenient to operate and study, natural gas hydrates can be synthetized in the vessel, unreacted gases can also be discharged in an equal pressure manner, decomposition of the hydrates is avoided, and the hydrates can be tableted, so that intuitive determination for CO2 displacement and pressure reduction combined mining of the hydrates as well as CO2 displacement mining of methane hydrates is realized.

A carbon dioxide driven electrical power plant for integration with surrounding utilities. This power plant uses the earth's gravitational effect on mass, provided by solid carbon dioxide, to create work. This work is then harnessed in the form of electrical power. The carbon dioxide gas released during the formation of dry ice and during the sublimation stage when the dry ice is dispensed at the bottom of a vertical shaft is recycled through a gas filtration system and liquefaction system to create additional dry ice.

The invention provides a well testing determination method for the carbon dioxide displacement front. The well testing determination method includes the steps that 1, well testing interpretation models are built and include a reservoir model and a seepage flow mathematical model; 2, the well testing interpretation models are solved numerically through pressure equation linearization; 3, according to the basic reservoir physical property test data, an analogy method is used for solution through basic well testing interpretation parameters to obtain pressure data in the pressure drawdown/recovery well testing process, and the pressure data are processed to obtain pressure and pressure semilogarithm or double logarithmic curves; 4, practical pressure and pressure semilogarithm or double logarithmic curves are fitted through the obtained result to calculate a target function value; 5, the carbon dioxide displacement front is determined according to the parameters obtained in the step 4 and a relational expression for solving the carbon dioxide displacement front. In the method, various physical property changes in the carbon dioxide displacement process and own characteristics of the stratum and injection wells are considered, and the accuracy of determining the carbon dioxide displacement front is improved.

The invention discloses a plugging agent for oil field gas driving, and the plugging agent is mainly applied to profile control and water plugging employing a carbon dioxide flooding well in an oil field. The plugging agent comprises the following components in percentage by weight: 0.2%-0.7% of a plugging agent tackifier for oil field gas driving, 0.2%-1.5% of a cross-linking agent and the balance of water. The plugging agent is prepared by the following steps: firstly, adding clear water to a liquid dispensing tank at the ratio, starting stirring, and evenly scattering the plugging agent tackifier for oil field gas driving; and stopping stirring, so as to prepare the plugging agent for use after a thickening agent is completely dissolved and dispersed. The cross-linking agent is added according to the actual requirement ratio during fracturing construction. The plugging agent is convenient to prepare, and large in gelling viscosity when used by matching with the cross-linking agent; gas escape is relatively well prevented; and the plugging agent can play a good role in profile control and water plugging by using the carbon dioxide flooding well.

The present invention relates to a method for inhibiting the asphaltene deposition damage during a hypotonic reservoir carbon dioxide flooding process through a nanometer fluid. The method comprises: simultaneously injecting carbon dioxide and a nanometer fluid into a hypotonic oil reservoir or alternatively injecting carbon dioxide and a nanometer fluid into a hypotonic oil reservoir. According to the present invention, through the injection of the nanometer fluid, the nanoparticles in the nanometer fluid can effectively adsorb asphaltene so as to prevent the damage on the reservoir due to the deposition of the asphaltene on the sand.

The present invention provides a method for describing the heterogeneity of a carbon dioxide drive reservoir layer. The method comprises: Step 1, calculating the permeability difference of blocks, anddetermining a reasonable permeability differential limit according to the permeability difference of study areas; Step 2, processing a permeability interpretation result in a certain study area and calculating the permeability difference of a grid model; Step 3, using a numerical simulation means to study the influence of different methods on the carbon dioxide drive gas breakthrough time; Step 4, analyzing the influence of physical and chemical properties of crude oil in the carbon dioxide drive on the ratio of gas to oil; Step 5, using the numerical simulation means to analyze the flow difference of different permeability value models; and Step 6, using the ratio of gas to oil in the actual model to fit, compare and correct the average permeability value. By virtue of the construction method provided by the present invention, according to the parameters that can be provided in the numerical simulation, a method for discretizing the permeability curve is established, and a numericalsimulation basis is provided for the improvement of the numerical simulation accuracy of the carbon dioxide drive and the quantitative characterization of the displacement mechanism thereof.

The invention discloses an extraction method for mining formed composite old mined-out area coalbed methane through a lower caving method. The method includes the steps that coalbed methane extraction is conducted by constructing a horizontal well at the position 1-5 meters above a lower goaf fissure zone; when the extraction amount of the coalbed methane is dropped to 10-20% of Q, segmented crushing is conducted, extraction is conducted on the goaf coalbed methane again, and when the extraction amount of the coalbed methane is dropped to 10-20% of Q again, supercritical carbon dioxide is injected to drive and replace the coalbed methane; extraction is conducted again till the extraction amount is dropped to 6 m<3>/min, and extraction is stopped. By means of the method, the problems that when a ground vertical drilling well is separately used to conduct extraction on a goaf originally, the effective contact area between the extraction drilling well and a goaf reservoir is small, and the extraction range is limited are solved; while the coalbed methane of the goaf on the lower layer is extracted, the coalbed methane resource close to the upper portion of the goaf is also extracted, and cost is saved; meanwhile, the horizontal well is located in the rock stratum, and therefore shaft collapse and blocking of the drilling well in a coal seam are avoided.

The invention provides a compound type anti-gas-channeling agent for carbon-dioxide flooding. The compound type anti-gas-channeling agent for carbon-dioxide flooding is prepared from the following raw materials: polymer gel and precipitate base fluid; on the basis that the total mass of the polymer gel is 100%, the polymer gel is prepared from the following raw materials: 0.5-1% of polyacrylamide, 0.1-0.5% of an organic metal crosslinking agent, 0.5-2% of a resin crosslinking agent, 0.05-0.2% of a stabilizing agent and the balance of simulation formation water; on the basis that the total mass of the precipitate base fluid is 100%, the precipitate base fluid is prepared from the following raw materials: 2-15% of a precipitation solution and the balance of simulation formation water. The compound type anti-gas-channeling agent for carbon-dioxide flooding is good in anti-gas-channeling effect.

The invention discloses an experimental device for ultrasonically promoting gas in CO2 (Carbon Dioxide) drive produced liquid to desorb. The device comprises a high pressure gas tank which is connected with a visual solution absorbing reaction kettle connected with data acquisition recording equipment, and the bottom of the visual solution absorbing reaction kettle is connected with an ultrasonic generating system. According to the device, the de-compressive desorbing process of the CO2 drive produced liquid in a separator can be simulated in the presence of ultrasonic waves, an initial condition and a terminating condition of the experiment are likely to be controlled, the repeatability of experiment is good, the data measurement record is accurate, the combination of ultrasonic frequencies and power can be diversified, and the desorbing phenomenon is visual, therefore the dissolving characteristics, desorbing characteristics and the ultrasonic reinforced desorbing function of the CO2 in the drive produced liquid can be beneficially and deeply studied.

The invention provides a method for inverting a carbon dioxide flooding frontal edge by multi-point continuous pressure measurement data. The method for inverting the carbon dioxide flooding frontal edge by the multi-point continuous pressure measurement data comprises the steps that 1, the actually measured continuous bottom-hole flowing pressure of a gas injection well and an oil production well are determined, and an actual measured continuous injection-production pressure difference is calculated according to the actually measured continuous bottom-hole flowing pressure of the gas injection well and the oil production well; 2, the theoretical continuous bottom-hole flowing pressure of the gas injection well and the oil production well are calculated, and a theoretical continuous injection-production pressure difference is calculated according to the theoretical continuous bottom-hole flowing pressure of the gas injection well and the oil production well; and 3, a carbon dioxide additional pressure drop is calculated according to the actually measured and the theoretical continuous injection-production pressure difference, and the equivalent wave and the radius of carbon dioxide are inverted. The method for inverting the carbon dioxide flooding frontal edge by the multi-point continuous pressure measurement data is accurate in result and easy to implement, and has significant meaning on improving the exploitation effect of carbon dioxide flooding and achieving scientific management of carbon dioxide flooding reservoirs.

The conveying and absorption agent, preferably for the active substances of the pharmaceutical, dietetic, and cosmetic preparations, consists of the extract from the hemp seeds, obtained by action of carbon dioxide. Advantageously, the extract is a component of the fat or wax base of the pharmaceutical or cosmetic preparation, preferably composed of the propolis relieved of its pollen contents. According to the method of production of the conveying and absorption agent from the hemp seeds for the active substances of the pharmaceutical, dietetic, and cosmetic preparations, the hemp seeds are ground down to hemp flour, being then pressure-extracted with carbon dioxide to the hemp oil. The hemp seeds are ground down to fine-grain flour, which is then powered into the extraction cartridges that are inserted into the extractor. Extractor is then closed and the carbon dioxide is then driven into it at the temperature between 35° C.-45° C. and the pressure between 25 MPa and 35 MPa, advantageously 40° C. and pressure 29 MPa. With the hemp oil extraction process slowed down, the carbon dioxide pressure in the extractor is reduced down to the ambient atmospheric pressure value and the hemp oil is separated from the carbon dioxide which is subsequently led away from the extractor to the reserve tank, where it will be stored in its supercritical condition. For removal of chlorophyll and waxes, 2%-35% in weight of the crushed silicon sand is mixed into the hemp oil extracted. Following the surface absorption, the crushed silicon sand is filtered out.

The invention discloses a gas-liquid separator for an oil field, and belongs to the technical field of gas-liquid separation of the oil field ground technology. The gas-liquid separator for the oil field is designed for solving the problem that after gas channeling occurs in a carbon dioxide flooding oil field, desorption of a large amount of carbon dioxide gas dissolved in produced liquid is difficult. The gas-liquid separator of the oil field comprises a shell, an ultrasonic system is arranged in the shell, and the ultrasonic system can generate ultrasonic waves so as to improve the desorption rate of carbon dioxide gas in the produced liquid. According to the gas-liquid separator of the oil field, the desorption rate of carbon dioxide gas in the produced liquid is improved through the cavatition effect and the mechanical effect of the ultrasonic waves, desorption of carbon dioxide gas in the produced liquid of the carbon dioxide flooding oil field is accelerated, carbon dioxide gas entering the produced liquid of the separator can be effectively desorbed within a standard set period, and the problem that desorption of carbon dioxide gas in the produced liquid of the carbon dioxide flooding oil field is difficult is solved.

The invention discloses a system and a method for producing synthesis gas from carbon dioxide enhanced coal-bed methane. The system comprises a carbon dioxide trapping system, wherein power plant flue gas is connected to a carbon dioxide storage tank by virtue of the carbon dioxide trapping system; the outlet of the carbon dioxide storage tank is divided into two paths, wherein one path is connected to a carbon dioxide pressure-injection system and the other path is connected to a third flow controller; the carbon dioxide pressure-injection system is connected to an extracted gas storage tank sequentially by virtue of an injection well, an extraction well and an extracted gas purifying device; the outlet of the extracted gas storage tank is divided into two paths, wherein one path is connected to a second flow controller and the other path is connected to a first flow controller; the first flow controller and the third flow controller, after being connected, are connected to the reaction channel of a methane catalytic reforming reactor by virtue of a gas composition analysis device; synthesis gas H2 and CO can be generated by the reaction channel; the second flow controller is connected to the heating channel of the methane catalytic reforming reactor; and the heating channel is connected to the carbon dioxide trapping system, so that the efficient utilization of carbon dioxide and coal-bed gas is achieved.