595 results about "Oil shale gas" patented technology

A process and system for recovering hydrocarbonaceous products from in situ oil shale formations. A hole is drilled in the oil shale formation and a processing gas inlet conduit is positioned within the hole. A processing gas is pressurized, heated, and introduced through the processing gas inlet conduit and into the hole. The processing gas creates a nonburning thermal energy front within the oil shale formation so as to convert kerogen in the oil shale to hydrocarbonaceous products. The products are withdrawn with the processing gas through an effluent gas conduit positioned around the opening of the hole, and are then transferred to a condenser wherein a liquid fraction of the products is formed and separated from a gaseous fraction.

A kind of mining oil gas method of the convection heating up oil-shale, involves the underground solid state energy and the mineral mining method improvement. The existing technical mining method efficiency is low, the cost is high, the scale is small, the big area implements and lacks the market competition ability with difficulty. This invention through in the ground arrangement group well, and selects the compression fracture method causes the group well to be interlinked, then the gap takes turns to choose the note hot-well and work-well, hot-well pours into 400 deg.C - 700 deg.C steam along the note oil-shale the ore level, heats up the ore level causes cheese root thermal decomposition to form the oil gas, and carries after the low temperature steam or the water along the production separates to the ground, finally forms the oil gas product. In the separation process may simultaneously the pre- hot water, and uses the water-injection well withdraws with work-well the convection way dries up oil-shale and the ore level around shale region afterheat, thus realized the goal of this invention is fast, big scale, low cost from oil-shale ore level mining oil gas.

The invention discloses a shale gas well productivity evaluation and prediction method. The method comprises the following steps: an expression of a differential equation of a single-phase seepage mathematical model is obtained; the differential equation is solved and represented by a pressure form to obtain a seepage velocity and output formula; a deliverability equation is determined through fitting production data; the derived output formula is arranged to obtain a shale gas horizontal well staged fracturing output formula; boundary pressure (pe) required to be known can be known from the shale gas output formula; and as shale gas has the influences of absorption and desorption, a deviation factor is required to be corrected to obtain formation pressure of a shale gas reservoir. The prediction method deduces the deliverability equation for a shale vertical well and a horizontal well according to the desorption and dispersion characteristics of the shale gas, so that a shale gas output evaluation method is built, the precise output prediction is obtained, and the economic efficiency is improved.

The invention discloses a method and a system used for determining well control dynamic reserves of a shale gas well. The method comprises the steps of obtaining an initial formation pressure of a shale gas reservoir, and calculating a well bottom flow pressure through structure data and production data of the gas well; establishing a first interpolation table based on a conversion relationship between a pressure and a pseudo-pressure to establish a corresponding relationship between the pressure p and the pseudo-pressure m(p); establishing a second interpolation table based on given basic parameters and Za(p) defined by a matter balance equation of the shale gas reservoir to establish a corresponding relationship between the pressure p and a ratio of the pressure p to Za(p); and based on the initial formation pressure, the well bottom flow pressure and the production data, determining the well control dynamic reserves of the shale gas well by adopting the first interpolation table, the second interpolation table and a productivity equation. According to the method and the system, a shut-in pressure is not needed to recover an evaluated average formation pressure in calculation; and a calculation result is suitable for various applications such as reasonable shale gas well production allocation, reasonable development technology policy making, development scheme optimization and the like.

The invention provides a process and device for carrying out stage dry distillation on oil shale under the state of full recycle, with the gas as the heat carrier. The oil shale is divided into three different sizes (such as 0-6mm, 6-20mm and 20-50mm) through crushing and screening, and the oil shale is firstly dried and heated to the temperature between 50 DEG C and 150 DEG C by the waste smoke exhausted from gas heating furnaces and then enters into the different sizes of furnaces for dry distillation to undergo dry distillation. After being treated by water spraying and an indirect cooling tower, a rotary trapper and an electric trapper for oil collection, the dry distillation oil and gas undergo oil-gas-water separation, and after separation, the oil enters into a storage tank, the water enters into a circulating water tank and the first part of gases serves as the heat carrier and is recycled, the second part of gases is used as the fuels for the heating furnaces and the third part of gases is used as the fuel gases for power generation.

The invention discloses a method for extracting shale oil and gas from oil shale in situ. The method comprises the steps that hot nitrogen is injected into an oil shale layer to crack kerogen in situ; after being extracted and separated, combustible gas which is generated initially is injected into a well together with the nitrogen by a certain proportion to have chemical reaction with the oil shale, so as to further crack organic substances in the oil shale, and extract shale oil and combustible gas; the hot nitrogen is an inert gas which is not only a carrier for transferring heat but also a carrier which carries shale oil and gas to above the ground; meanwhile, due to the pressure action of fluid, an oil and gas channel is favorably formed in the oil shale layer. The circulating combustible gas can have chemical reaction with the kerogen in the oil shale, so as to accelerate the reaction. According to the method for extracting shale oil and gas from the oil shale in situ, mining cost and risks are greatly reduced, the operability is greatly improved, problems caused by a surface dry distillation technology and an existing in-situ technology are fundamentally solved, the construction difficulty and cost are effectively reduced, and the method does not pollute underground water, is environment-friendly and is non-toxic.

A method for heating materials by application of radio frequency (“RF”) energy is disclosed. For example, the disclosure concerns a method for RF heating of petroleum ore, such as bitumen, oil sands, oil shale, tar sands, or heavy oil. Petroleum ore is mixed with a substance comprising susceptor particles that absorb RF energy. A source is provided which applies RF energy to the mixture of a power and frequency sufficient to heat the susceptor particles. The RF energy is applied for a sufficient time to allow the susceptor particles to heat the mixture to an average temperature greater than about 212° F. (100° C.). Optionally, the susceptor particles can be removed from the mixture after the desired average temperature has been achieved. The susceptor particles may provide for anhydrous processing, and temperatures sufficient for cracking, distillation, or pyrolysis.

A system and method for extracting hydrocarbon products from oil shale using nuclear energy sources for energy to fracture the oil shale formations and provide sufficient heat and pressure to produce liquid and gaseous hydrocarbon products. Embodiments of the present invention also disclose steps for extracting the hydrocarbon products from the oil shale formations.

The invention relates to the technical field of shale gas exploitation, in particular to a liquid CO2 fracturing technology for a shale gas well. When the liquid CO2 fracturing technology is constructed, a fracturing pump truck, a sealed fracturing blender truck, a CO2 boosting pump truck, a measuring truck, a fracturing pipeline truck, a CO2 tank vehicle and a CO2 storage tank need to be arranged; the fracturing pipeline truck is provided with a pressure manifold and a high pressure manifold; and the measuring truck is provided with a monitoring instrument. The liquid CO2 fracturing technology is characterized in that the liquid CO2 fracturing technology is executed according to six steps of placing fracturing equipment and construction vehicles, testing the pressure, processing pre-acid, constructing liquid CO2 fracturing, closing the well after carrying out fracturing and opening the well for gushing and carrying out flowback after carrying out fracturing. The liquid CO2 fracturing technology for the shale gas well implements high flowback speed and short operation period and basically has harmlessness to a shale gas reservoir stratum.

Three new embodiments to the Chattanooga Process that convert or upgrade oil bitumen, a combination of oil sands and bitumen, a combination of sand and bitumen, and oil shale to high grade low sulfur (about 0.1 to 0.5 wt. % sulfur, or less) crude oil. The invention relates to a continuous process for producing synthetic crude oil (SCO) from oil sand bitumen which has been extracted from under ground via in situ processes, or strip mined and extracted via hot water extraction processes before upgrading. It can also apply to kerogen extracted in situ from shale underground. The process involves treating the hot bitumen with sand from an extraction process or the hot oil from kerogen with ground shale containing kerogen in a fluid bed reactor where the reactant and fluidizing medium is only hydrogen. The invention also relates to a continuous process for producing synthetic crude oil (SCO) from oil shale kerogen. The invention relates to a continuous process for producing synthetic crude oil from oil bearing material, e.g., oil shale or oil sand (tar sand), through continuous process for producing synthetic crude oil from bituminous oil sand (tar sand) or shale. The process includes treating the oil sand (tar sand) or shale to produce a fluidizable feed, feeding the fluidizable feed to a fluidized bed reactor, and fluidizing and reacting the fluidizable feed in the fluidized bed reactor with a feed of hydrogen provided by a feed stream having a stream containing hydrogen in a concentration greater than 90 vol % (90 vol %-100 vol % H2). In one embodiment, the invention relates to a continuous process which can recover methane and ethane from a recycle hydrogen stream. In one embodiment, the process can recover PSA tail gas as feed to a hydrogen plant. In one embodiment, the process can be operated to reduce or eliminate the requirement for externally provided methane feed to the hydrogen plant.

The invention belongs to the technical field of unconventional oil gas production increasing transformation and particularly, relates to a shale gas horizontal well refracturing productivity calculation method. The method comprises the following steps of: by using a shale reservoir as an elastic material which is small in deformation, establishing a stress-strain model and a reservoir physical property parameter dynamic model; establishing a continuity equation in kerogen and an inorganic substance; respectively carrying out numerical solution on an established solid deformation control equation and shale gas multiscale seepage equation; bringing geological parameters, physical property parameters and primary fracturing design parameters of a shale gas well reservoir into a shale gas fluid-solid coupling numerical model, and recording a pressure field and hydraulic fracture flow conductivity of the reservoir; and bringing refracturing design parameters into the shale gas fluid-solid coupling numerical model, and calculating productivity of a shale gas well after refracturing. According to the method disclosed by the invention, seepage characteristics and stress-pressure field dynamic variations of the shale reservoir are considered, productivity and a recovery ratio of the shale reservoir after refracturing are predicted, and shale gas horizontal well refracturing optimizationdesign is guided.

A process and apparatus for generating hydrogen from oil shale. Crushed oil shale may be placed in a chamber and combusted with carbon monoxide, oxygen and steam to form a gas stream of hydrogen and carbon monoxide. The hydrogen and carbon monoxide stream may be passed through a mechanism to produce hydrogen. In one embodiment, the hydrogen and carbon monoxide stream may be passed through a catalytic converter to produce hydrogen and carbon dioxide. The hydrogen and carbon dioxide may be cooled further and passed through a scrubber to remove the carbon dioxide such that hydrogen is produced. In another embodiment, the hydrogen and carbon monoxide may be passed through fluidized beds of magnetite to produce metallic iron, carbon dioxide and water. The metallic iron may then be conveyed to another chamber, where it may be treated with steam, producing magnetite and hydrogen.

The invention discloses a low-temperature carbonization apparatus and method for oil sand, oil sludge, oil shale and biomass. The apparatus comprises a delivery apparatus, a storage bin, a metering apparatus, a drying furnace and a surge bin. The method comprises the following steps: drying, preheating, carbonizing, and cooling. The core of the invention is an external heating type rotary carbonization furnace which realizes the pyrolysis of oil sand, oil shale, oil sludge (oil sludge on the ground, oil sludge at the bottom of a tank and oil-containing sludge from oil refinery) and biomass, and the product is high in purity and low in loss. The invention effectively solves the problems of solid materials such as adhesion, wall accretion and the like in the pyrolysis process by material returning. The technology provided by the invention is simple in process and reliable and stable in operation, and has obvious advantages in the treatment of small particle materials such as oil shale, oil sand, oil sludge (oil sludge on the ground, oil sludge at the bottom of a tank and oil-containing sludge from oil refinery), biomass and the like.

The invention relates to a carbonization system of an oil shale fluidized bed. Oil shale with high oil content and low pyrolysis temperature is used as a carbonization material; high-temperature steam-gas and circulating hot ash are utilized to fluidize and heat the oil shale in a carbonization chamber of the fluidized bed; after ash removal, mixed airflow of generated shale oil and noncondensable gas and vapour in the carbonization chamber of the fluidized bed enters a cooler; the condensed oil-water mixture is divided into shale oil and water through the oil-water separator; the shale oil is transported to a shale oil storage tank; the water is purified and is conducted to the cooler; and noncondensable gas which is not condensed through the cooler is transported to a fuel gas storage tank. Oil shale carbocoal produced through the carbonization chamber of the fluidized bed is directly transported to a boiler of an oil shale carbocoal circulating fluidized bed, is burned and discharges heat; one part of the produced steam-gas is used as fluidized wind of the carbonization chamber of the fluidized bed; the residual steam-gas is conducted to a steam turbine-dynamo system, applies work and generates electricity; and part of circulating ash in the boiler is used as a heat source of the carbonization chamber of the fluidized bed. The carbonization system can realize high-efficient, clean and economic comprehensive utilization of the oil shale.

The invention relates to the technical field of horizontal well fracturing, and discloses a new fracturing process suitable for the encrypted development of a shale gas well, which comprises the following steps of (1) collecting the data; (2) analyzing the stress and compressibility; (3) designing the interval of the segment clusters; (4) designing the number of clusters; (5) carrying out the temporary plugging design in the midway; (6) designing the construction displacement; (7) designing a fracturing scale; and (8) designing a sand adding mode. According to the essence of the method, the small-section multi-cluster segmented design of reducing the section cluster spacing is carried out on the target horizontal well by analyzing the single well ground stress characteristics and the compressibility of the shale gas well of encrypted development; meanwhile, the pumping design of the variable-density perforation, midway ball throwing temporary plugging and continuous sand adding is combined, and finally, the effect of improving the single well transformation complexity and the reservoir transformation efficiency is achieved, the volume transformation of the whole horizontal well isachieved, the crack complexity is improved, the transformation strength is improved to a larger extent through improvement of a sand adding mode and a pumping program, and meanwhile the single well construction cost is reduced.

The comprehensive optimized oil shale utilizing method includes crushing and sieving oil shale ore, dry distilling the 8-80 mm size component in retort furnace to produce shale oil and fuel gas, crushing the semicoke waste into 8 mm below size, mixing the crushed semicoke waste and 8 mm below size waste grain from oil refining to form mixed fuel for the circulating fluidized bed boiler, using the produced steam partially for externally supplying and partially to drive turbine generator, and using the cinder in producing cement, haydite and building block. The present invention provides one new way for comprehensive utilization of giant oil shale resource.

The invention discloses a method for extracting shale oil gas by an oil shale in-situ topochemical method. The method includes: a partial chemical reaction area is formed in an underground oil shale stratum via hot mixed gas; in the whole process, a series of 'chain reactions' are induced by means of controlling concentrations of injected hot mixed gas and recovered hot mixed gas, and along with gradual temperature rising and range widening of the reaction area, porosity and permeability of the oil shale stratum increase continuously, heat strengthening reaction processing is realized finally, and self catalytic cracking of the oil shale stratum from inner to outer is achieved to generate shale oil and fuel gas. After the chain reactions are over, fixed carbon in the oil shale stratum is continuously enabled to react to generate low-heating-value gas via the hot mixed gas, high-temperature waste heat in the area finished in cracking reaction is recycled, and self-supporting and maximal utilization of energy for the oil shale stratum cracking are realized. By the aid of the method, exploring method, environmental harms and commercial risks can be reduced.

The invention provides a full cycle dry distillation process and a system which use oil shale (coal) to produce shale oil; the technological process includes that the distillation of the oil shale is processed in an oil shale distillation system which is composed of an oil shale input storage tank, a non-oxygen coal-gas heating retort and a semi-coke discharge device to generate pyrogenous coal gas and the semi-coke; the pyrogenous coal gas is separated and purified by a pyrogenous coal gas multi-stage purifying system composed of a coal gas collecting pipe, an oil-washing tower, an intercooling tower and an electrical oil trap; the obtained coal gas is preheated by a coal gas preheating system composed of a fluidized bed combustion furnace, a spiral feeder and a duster collector and then is fed into the non-oxygen coal-gas heating retort for the dry distillation of the oil shale; the oil product separated from the oil-washing tower, the intercooling tower and the electrical oil trap is purified and collected through an oil product purifying and collecting system so that the shale oil product is obtained; the semi-coke and the sludge generated during the dry distillation and purification process are used as the materials for the preheating of the coal gas. The dry distillation process in the invention can effectively realize the functions of dry distillation, dust separation and combusting the semi-coke and sludge generated during the process of dry distillation for the preheating of the coal gas; thereby, the sources is utilized sufficiently and the environmental protection requirement is fulfilled.

The invention relates to a water-based drilling fluid suitable for a long-section horizontal well of a shale gas and an application of the water-based drilling fluid. The water-based drilling fluid is prepared from the following components in parts by weight: 100 parts of water, 0.5-5 parts of bentonite, 0.1-0.4 part of sodium carbonate, 0-8 parts of an inorganic salt, 1-5 parts of a filtrate reducer, 0.1-1 part of a viscosity enhancer and carrying agent, 0-1.5 parts of a wetting agent, 0.5-5 parts of a shale inhibitor, 1-5 parts of a lubricant, 1-6 parts of a micro-nano blocking agent, 0-3 parts of a viscosity reducer, 0-1 part of a pH modifier and 0-280 parts of a weighting material. According to the drilling fluid, the density can reach 2.3g/cm<3>, the high-temperature and high-pressure filter loss is smaller than 5ml and the rheological property, the filtration reducing property, the lubricity and the inhibitive ability are equivalent to those of an oil-based drilling fluid; the surface performance of the shale can be improved, the hydrophobicity can be strengthened and the compressive strength of the shale is retarded; the water-based drilling fluid has good antifouling property and high sealing capacity; shale micro cracks can be sealed; pressure transmission is retarded or blocked; and the well-bore stability of the shale is facilitated.

The invention relates to a comprehensive utilization process of oil shale. Oil shale raw ore is crushed by a crushing and screening device until the particle size is less than 15mm; one part of crushed oil shale particles are transported to a screw feeder and then to a microwave drum dry distillation device, the oil shale particles absorb microwave and generate high temperature methane gas, distilled char and methane gas are entered into a closed solid and gas separating device, separated high temperature methane gas is entered into a condensing and recycling device and cooled to separate the oil shale; low temperature methane gas after oil extraction is entered into an internal combustion engine to be combusted for power generation and/or entered into a circulating fluidized bed boiler to be combusted, heat quantity released from the combustion is transmitted to water by the heating surface of a boiler, the superheated steam is supplied as working fluid or sent into a steam turbine to generate electricity; carbon-content of the slag and ashes is less than 2 percent and the finished product can be directly as building raw materials without roasting. The invention has the advantages of short process, comparatively small occupying space, high comprehensive utilization, low cost, being scientific and rational, etc.

The invention discloses a treatment method for flowback fluid in horizontal well fracturing exploitation of oil fields and unconventional oil and gas fields, such as natural gas and shale gas. The method comprises the steps of: removing scale-forming elements from fracturing flowback fluid by flocculation and sedimentation; and converting chloride ions in waste water into hypochlorite and chlorine gas by using an acousto-optic electrical excitation effect, and carrying out deep oxidation without adding extra oxidants in the whole process. According to the method, components influencing the preparation of the fracturing fluid are removed, and other useful components are reserved completely or partially, thereby reducing the waste liquid treatment cost, and reducing the addition cost of additives during the preparing of the fracturing fluid. According to the method provided by the invention, the process flow is short, the cost is low and the efficiency is high, and is particularly suitable for treating flowback fluid with high oil content, high COD (chemical oxygen demand) and high turbidity produced by horizontal well fracturing construction as well as waste waters produced by various kinds of oil fields.