278 results about "Shale oil and gas" patented technology

The invention belongs to the technical field of artificial rock core preparation, and in particular relates to a preparation method of an artificial rock core of jointing shale. The method comprises the following steps: mixing and stirring cement, quartz sand, clay and gypsum powder; adding a small amount of cereal and scraps of paper into the mixture, adding water into the mixture and stirring uniformly; casting the mixture in a layered manner to form a cement test sample; and coating lubricating oil between every two layers, and drying the cement test sample for molding, thereby obtaining the artificial rock core of the jointing shale. By the preparation method, the cement test sample with certain fracture development, bedding development and brittleness can be obtained, and the mechanical properties of a bedding plane (1), a natural fracture (2), a hydraulic fracture (3) and the like of the jointing shale rock can be simulated relatively accurately, so that shale oil and gas can be developed effectively. According to the preparation method, the used materials are simple, the cost is low, and the operation is simple and convenient.

The invention provides a complicated rock core preparation method based on CT scanning and 3D printing. Based on a combined technology of CT scanning and 3D printing, the reappearance of an underground rock pore structure characteristic is realized, and the visualization of oil-gas-water distribution inside a rock core can be achieved. Through a 3D printing technology, the visualization and actualization of the digital rock core and a network model can be achieved, and the underground core pore structure can reappear in a real object form. More importantly, with the continuous input and development of unconventional oil-gas fields such as carbonate rocks, shale oil and gas and compact oil and gas, the complicated rock core preparation method has the advantage that by using the combined technology of CT scanning and 3D printing, a new thought and method is provided for representation and preparation of special rock cores.

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.

The embodiment of the present invention provides a method for extracting oil and gas from underground oil shale by microwave heating and its simulation experiment system. , inject microwave strong absorption medium into the generated longitudinal fractures; carry out direct microwave radiation heating on the oil shale ore layer and the microwave strong absorption medium, and conduction heating of the microwave strong absorption medium with temperature increase to the oil shale The ore layer, and the generated oil and gas are exported through the transverse fractures. The method of the embodiment of the present invention utilizes microwave heating, and by making cracks in the oil shale bed, filling it with a microwave strong absorption medium, it can effectively improve the microwave absorption efficiency, make the oil shale bed heat up rapidly, and increase the oil and gas content of the oil shale. mining efficiency.

The invention discloses a detection method and a device for effective fractured intervals in an unconventional shale oil and gas reservoir. The method includes: collecting logging information and core sample information of intervals of interest; calculating volume contents of all minerals in rock generating the intervals of interest according to the collecting logging information and the core sample information; calculating the poisson ratio of all mineral constituents in the rock generating the intervals of interest according to the core sample information and rock space volume average elastic parameter models; calculating the fragility index of the rock generating the intervals of interest according to the volume contents of all the minerals and the poisson ratio of all the mineral constituents in the rock generating the intervals of interest; and selecting the intervals of interest with the high rock fragility index in the shale as the effective fractured intervals in the unconventional shale oil and gas reservoir. By means of the detection method and the device for the effective fractured intervals in the unconventional shale oil and gas reservoir, the actual production requirement for selecting the effective fractured intervals in exploration and development of the unconventional shale oil and gas reservoir can be met.

The invention discloses reusable slippery water fracturing fluid for a shale oil and gas reservoir. The reusable slippery water fracturing fluid for the shale oil and gas reservoir comprises the following components in percentage by weight: 0.02 to 0.08 percent of a resistance reducing agent, 0.7 to 1.5 percent of a discharge aid, 8 to 12 percent of an auxiliary discharge aid, 5 to 10 percent of an interfacial tension-reducing synergist, 0.05 to 0.1 percent of a clay stabilizer, 0.007 to 0.01 percent of a sterilizing agent, 0.04 to 0.06 percent of a scale inhibitor and the balance of water. The reusable slippery water fracturing fluid for the shale oil and gas reservoir has the beneficial effects that (1) the resistance reducing agent can be dispersed and dissolved quickly to form a uniform system, so the problem of difficulty in large-scale intermediate liquid preparation in a shale fracturing process is solved; (2) the slippery water fracturing fluid can be reused, so the treatment cost of return liquid is reduced; (3) the resistance reducing ratio of the slippery water is more than 75 percent, so large-displacement construction is realized, the requirement on pump injecting equipment is reduced, and the frictional resistance of the slippery water in a pipeline in a large-displacement fracturing construction process can be effectively reduced; and (4) the slippery water fracturing fluid has a wide application range, strong temperature adaptability and temperature adaptability, and low requirement on water quality.

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 relates to a well drilling type oil gas preparing system through gasification and dry distillation of oil shale at a normal position and a technical method thereof. At least two parallelly arranged directional wells are arranged in an oil shale layer, the horizontal sections of the directional wells are arranged at the bottom of the oil shale layer, an igniting well is respectively arranged between the tail ends of the horizontal sections of the directional wells and the ground, a plurality of auxiliary gasifying wells are arranged between the horizontal sections of the directional wells and the ground, the horizontal sections of the directional wells are arranged between the vertical sections of the directional wells and the igniting wells, and a plurality of oil gas collecting wells are arranged between the gasifying area and the ground. The technological procedure includes: igniting for reverse fire power penetration and expanding a gasification and dry distillation passage; gasifying and dry-distilling the oil shale layer of the gasifying area in positive, negative or fixed point mode; loosening and heating the oil shale layer in a dry distillation area so as to produce cracks on the dry distillation area and generate oil shale oil gas and combustible gas; collecting the oil shale oil gas through an oil gas collecting well; and condensing and separating the oil shale oil gas on the ground surface, thereby obtaining oil shale oil and combustible gas. The well drilling type oil gas preparing system through gasification and dry distillation of the oil shale at the normal position integrates shaft building, oil shale exploitation and ground surface dry distillation oil preparing technology, shortens the production process, is small in investment, high in efficiency and safe and protects the environment.

The invention belongs to the technical field of oil field chemicals and relates to a supercritical carbon dioxide thickening agent as well as a preparation method and application thereof. The invention provides a copolymer comprising CO2-philic monomers and tackifying monomers. The invention further provides a preparation method of the copolymer and use of the copolymer as a thickening agent in the development of shale gas. The supercritical carbon dioxide thickening agent is high in yield and good in repeatability and simultaneously has high efficiency and environmental friendliness, and a synthetic method is simple. The prepared copolymer which is used as the thickening agent has the characteristics of high solubility in carbon dioxide, good tackifying performance, environmental friendliness and the like and can be applied to the exploiting field of shale oil and gas resources such as CO2 crushing, and the purpose of efficient and environment-friendly construction is achieved.

The invention discloses a method for analyzing the rock facies of a shale bed section. The method includes the following steps that a classification and naming rule of the rock facies is established; the rock facies boundary is recognized; the types of the rock facies are divided; the characteristics of the rock facies are described, and thus the favorable rock facies can be made definite; the distribution range of the rock facies is analyzed; comprehensive assessment of the rock facies is conducted. The analysis method is simple, clear, practical and easy to operate. By the adoption of the analysis method, the exquisite layering problem of a large set of extremely-thick and monotonous shale bed section can be solved quickly, and thus 'selecting the best from the splendid' in layer commenting and section choosing as well as in fracturing layer choosing using the rock facies as the unit is carried out based on the geology, development and engineering integrated principle, and therefore the economic aims of decreasing costs and increasing benefits and the aim of improving the single-well production capacity of shale oil and gas can be achieved.

The invention discloses a method for extracting shale oil gas through in-situ catalytic oxidation of oil shale. The method comprises the following steps: (1) drilling a plurality of hot gas injection wells and producing wells till a target oil shale layer; (2) hydrofracturing for artificial fracture forming through vertical well perforation or horizontal well drilling, and during fracture forming, uniformly mixing a propping agent and a catalyst according to a certain volume ratio and pressing a mixture together with a fracturing fluid into underground fractures till a whole fracturing zone is full of the propping agent and the catalyst; (3) injecting hot mixed gas into the oil shale layer through the hot gas injection wells so as to heat the oil shale layer till the temperature of the oil shale layer reaches 200 DEG C; (4) when the temperature of the oil shale layer reaches a certain range, stopping heating the mixed gas and continuing to inflate room-temperature mixed gas into the oil shale layer; and (5) exploiting the shale oil gas, and separating and treating on the ground. By the method, the acting range of the catalyst is widened, the catalytic effect of the catalyst is enhanced, a condition is provided for sufficient reaction of the oil shale, and thus the energy utilization rate of in-situ exploitation of the oil shale is increased and the reaction time is prolonged.

The invention provides a quantitative evaluation method of a shale oil and gas enrichment index on the basis of multi-factor nonlinear regression. The method comprises the following steps: constructing a quantitative evaluation index of a shale oil deposit, and carrying out the quantitative analysis of a one-dimensional geological factor; and synthesizing multi-dimensional geological factors to establish a nonlinear regression formula, and carrying out the quantitative evaluation of a shale oil deposit enrichment region. The quantitative evaluation method of the shale oil and gas enrichment index on the basis of the multi-factor nonlinear regression combines various geological factors which affect shale oil deposit development, establishes a nonlinear shale oil deposit representation formula based on multi-dimensional geological parameters, improves a quantitative level of the geological factors on representing the shale oil deposit, and can provide an important reference basis for the evaluation of the shale oil deposit enrichment region in a high-mature exploration area.

The invention discloses a shale oil and gas resource potential grading evaluation criterion method and relates to an evaluation criterion. The method mainly includes: discussing oiliness of different types of argillaceous dolomite according to absolute oil content (S1) and relative oil content parameter (S1/TOC), establishing shale oil resource grading evaluation criterion by utilizing knee points according to correlation between the S1 and the TOC, and dividing shale oil and gas resources into four classes of enriched, medium enriched, low-efficiency and invalid resources. By the principle and the method, the oiliness of the different types of argillaceous dolomite is discussed from the perspectives of hydrocarbon generation and expulsion, and a method for quickly evaluating shale oil and gas resource potential is established. In addition, the shale oil and gas resource potential grading evaluation criterion is provided from the perspectives of shale oil and gas resource quantity and shale oil recoverability for the first time, theoretical support is provided for optimal selection of basins containing shale oil and gas in China, and the shale oil and gas resource potential grading evaluation criterion is directly related to decision making for investment and exploration direction of an exploratory area.

The invention discloses a method for calculating the geological sweetness and the engineering sweetness of shale gas. The method selects evaluation parameters with independence, the accumulated yield after pressing is taken as a basis, weight allocation of the parameters is calculated by adopting a grey relevant degree method, and the sweetness of shale is represented by applying a calculating method of a European type paste progress. According to the method for calculating the geological sweetness and the engineering sweetness of the shale gas, the problems that the pertinence of fracturing construction section cluster partition conducted on a well is not strong and the effective gassing section cluster proportion is not high in a shale oil and gas reservoir are successfully solved, and the strong evidence is provided for optimization of a sectional fracturing section and a cluster position of a horizontal well, so that the target of cost decreasing and benefit increasing is furthest achieved.

An evaluation method for different types of pore evolution in shale is related, which is applied to the field of unconventional oil and gas research. As the shale depth or maturity increases, different types of pores (including intergranular pores, intragranular pores, organic pores and fractures) developed in shale are constantly changing, which is important for shale oil and gas accumulation. The present invention starts from the high-resolution scanning electron micrography of shale, and respectively extracts the areal porosity of different types of pores based on the division criteria of different types of pores and pore identification in the established shale, and combines the low-temperature N₂, CO₂ adsorption experiments and the high-pressure mercury intrusion experiments to obtain the total pore volume and establish the evolution chart of different types of pores. The proposed method has an important application value for the exploration of unconventional shale oil and gas resources.

The invention discloses a processing method of shale refracturing. The processing method of shale refracturing comprises the steps that shale samples are subjected to initial fracturing and secondaryfracturing, tracks are displayed with different colors, and hydraulic fracture forms is analyzed after two-time fracturing, intuitive interference characteristics of the two fracturing fracture formsafter shale refracturing can be obtained; and in addition, the steering characteristics of initial fracturing fractures of the shale samples under the action of temporary plugging agents are analyzed,the characteristics of initial fracturing pump pressure curves of the shale samples and secondary fracturing pump pressure curves of the first shale sample are analyzed, support for a shale reservoirrefracturing well technological parameter design is provided, and the processing method is of great significance for reactivating shale oil and gas wells which are abandoned or are about to be abandoned. The processing method can be used not only for physical simulation of refracturing shale gas reservoir rock mass, but also for other dense reservoir rock mass, and improves the applicability.

The invention relates to a multi-cluster perforating and fracturing completion pipe string and construction method. The pipe string is composed of a completion pipe string body, a well cementation rubber plug, a plurality of blockers, a multi-cluster perforating gun and a cable. The completion pipe string body is formed by sequentially connecting a float shoe, a float collar, an explosion valve and a plurality of preset ball seats through a casing pipe, and the well cementation rubber plug is located at the upper end of the float collar in the well cementation work later period; the outer diameters of the blockers are sequentially increased according to grades, and the blockers are inserted in the preset ball seats respectively; and the multi-cluster perforating gun is connected with the tail ends of the blockers, and the tail end of the multi-cluster perforating gun is connected with the cable. The method comprises the steps that firstly, the completion pipe string body is sent to the designated position inside a naked-eye shaft; well cementation work is carried out; and first-stage fracturing work, second-stage fracturing work, third-stage fracturing work, fourth-stage fracturing work and fifth-stage fracturing work are sequentially completed. The pipe string and the construction method are applicable to multi-cluster perforating and fracturing construction of the shale oil and gas reservoir layer.

The embodiment of the invention discloses a shale oil and gas microwave resonance impact collaborative production-increasing technical method. The shale oil and gas microwave resonance impact collaborative production-increasing technical method comprises the following steps that S100, a shale bed is subjected to inherent frequency detection and vibration and temperature detection; S200, an electric pulse excitation source is controlled to emit a high-energy pulse wave band to be subjected to harmonic resonance with shale, and thus the shale cracks to form a crack; S300, the microwave frequency, the penetration depth and the microwave absorbent delivery quantity are determined; S400, variable-power electromagnetic waves are superimposed on the basis of high-energy electric pulse waves, an oil reservoir is heated through a variable-power high-frequency medium polarization heat-generation mechanism, the viscosity of shale oil and the plasticity and toughness of the reservoir are lowered,and the reservoir brittle rupture tendency is enlarged; and S500, the reservoir is improved, and collaborative production-increasing is realized. The advantages of an electromagnetic wave heating production-increasing technology and a frequency spectrum resonance impact production-increasing technology are combined, the high-energy impact waves with the inherent frequency of the target reservoir are superimposed on the electromagnetic wave heating basis, and the characteristics of low pollution, low energy consumption and the like are realized.