388 results about "Unconventional oil" patented technology

The invention relates to the technical field of unconventional oil-gas exploration, and discloses a well-seismic integrated horizontal well geosteering risk evaluation method, which comprises the following steps: S1, acquiring three-dimensional seismic data, measurement while drilling data and geological logging data through a well-seismic integrated data acquisition platform; s2, constructing a horizontal well geosteering dynamic model based on multi-source heterogeneous data, and integrating a seismic inversion result and real-time drilling parameters; by establishing a well-seismic data dynamic fusion mechanism and a multi-source risk quantification model, the problem of space-time dislocation of seismic inversion and measurement-while-drilling data is solved, the recognition precision of a fault boundary, a lithologic interface and a pressure abnormal zone is ensured to be matched with drilling position changes in real time, risk misjudgment caused by model updating lag in a traditional method is eliminated, and the accuracy of the method is improved. The accuracy and timeliness of geosteering decision making of the complex structure area are improved; by monitoring well track deviation and geological model prediction deviation in real time, the risks of well wall instability and target deviation are avoided, and the operation safety of the horizontal well in the full life cycle is guaranteed.

The invention discloses a rapid simulation and layered injection-production real-time optimization method suitable for a complex oil reservoir, and belongs to the field of unconventional oil reservoir numerical simulation, and the method comprises the following steps: 1, constructing a GMM-XGB hybrid model based on a Gaussian mixture model and an XGBoost algorithm; 2, constructing a layered connected network model based on a physical model; step 3, carrying out automatic history fitting by adopting an ES-MDA algorithm; and 4, establishing a layered injection and production real-time optimization objective function mathematical model, and performing layered injection and production real-time optimization based on an SHADE algorithm. According to the method, the recovery efficiency of the complex oil reservoir can be improved, the stable production period of an oil field is prolonged, and efficient utilization of resources and maximization of economic benefits are achieved.

The invention provides a high and low temperature true triaxial fracturing, seepage and microscopic monitoring experiment system and method. The system comprises a three-dimensional model and a reaction kettle module, the triaxial stress loading module is arranged at the bottom and the periphery of the cavity of the three-dimensional model and reaction kettle module; a fracturing module; a temperature control module; and a crack monitoring module. Through internal and external integral temperature control, large-range temperature adjustment and stable control of-15 DEG C to 130 DEG C are realized; monitoring points such as acoustic emission, resistivity and the like are carried to explain and analyze the dynamic change rule of the crack in real time; through the innovative structural design of the device, the functions of kettle body sealing, high-stress-difference triaxial synchronous loading, radial uniform seepage and the like are achieved, the experimental requirements of hydrate in-situ generation and decomposition, large-size rock sample saturation, high-stress-difference fracturing experiments and the like are met, the true-triaxial large-physical-model experimental application scene is expanded, and the experimental efficiency is improved. And technical support is provided for fracturing transformation process optimization, scheme design and the like of unconventional oil and gas resources such as deep shale gas and hydrates.

The invention discloses a deep learning assisted acceleration fracturing construction parameter intelligent real-time optimization method, and belongs to the field of unconventional oil and gas field development, and the method comprises the steps: constructing a structured sample database covering geological attributes, engineering parameters and fracturing effect responses, and carrying out the unified preprocessing of multi-source data; constructing a multi-modal space-time collaborative prediction model, and combining a multi-expansion time permissible convolutional network, a three-dimensional residual network and a cross attention mechanism; supervised learning training is carried out based on a database, sparse regularization and learning rate scheduling are introduced, and the model precision and generalization ability are improved; a hierarchical collaborative optimization framework of outer-layer Bayesian search-inner-layer CMA-ES refinement is provided, and reservoir transformation volume maximization and construction feasibility are achieved under complex constraints; compared with an existing method, optimization parameters of the method include the cluster distance and the section distance and further include the displacement, the sand concentration, the fracturing fluid type and other construction parameters, and real-time optimization of the fracturing construction parameters can be achieved through the machine learning agent model.

The invention discloses an unconventional oil and gas yield prediction method based on space-time Transform, which is characterized in that geological parameters, fracturing construction parameters and production dynamic data are fused, and time sequence dependency and spatial heterogeneity of modeling parameters are synchronized by utilizing a space-time attention mechanism. Firstly, normalization and space-time alignment are carried out on multi-source data, and a joint input matrix is constructed; then, a dynamic change trend of fracturing construction parameters is extracted through a time attention module, a space contribution weight of geological parameters is quantified through a space attention module, and a space-time interaction matrix is introduced to capture a multi-dimensional coupling relation; and finally, outputting a yield prediction result through feature fusion and MLP. According to the method, the dependence of a traditional model on a single data source is broken through, the precision and interpretability of unconventional oil and gas yield prediction are remarkably improved, and reliable technical support is provided for oil and gas field development strategy optimization.

The invention discloses a CO2-oil near-miscible phase pressure acquisition system and method based on convective mixing, and belongs to the field of CO2 oil displacement. The system comprises a high-temperature and high-pressure reaction kettle, a temperature and pressure control system, a gas injection module, a liquid injection module and a monitoring control module. According to the method, the oil phase and the carbon dioxide are induced to form a convective mixing effect by dynamically regulating and controlling the injection flow rate, and when no interface of the system reaches a mutual convective mass transfer state, the system pressure corresponding to a phase interface disappearance critical point is directly recorded as a near-miscible-phase pressure value. The near-miscible pressure value obtained by the method is high in accuracy, the single test time is shortened to 1 hour, the test period is remarkably shortened, near-miscible pressure parameters under different temperature conditions can be measured in a short time, the CO2-oil near-miscible pressure can be measured by simulating a high-temperature and high-pressure environment of a stratum, and the method is suitable for popularization and application. And high-timeliness key phase state data support is provided for unconventional oil and gas reservoir development.

The invention discloses a three-dimensional fine geological modeling method for conventional and unconventional oil and gas reservoirs, which comprises the following steps of: firstly, performing multi-source data integrated management: integrating heterogeneous data such as drilling data (lithology and logging curves), a geological profile map, seismic exploration data (seismic waves and induced polarization), construction dynamic data (tunnel face sketches and laser point clouds) and the like; unified storage and dynamic calling are realized; by integrating multi-source data of earthquake, logging, geochemistry and the like, a high-precision three-dimensional model is established, such as a drilling data regularization processing algorithm and a point cloud hole filling algorithm, the problems of inconsistent data formats and space missing are effectively solved, and the geometric precision and topological integrity of the model are improved. Therefore, the problems of difficulty in multi-source heterogeneous data fusion and insufficient model precision in existing oil and gas reservoir three-dimensional geological modeling are solved; through the multi-dimensional data fusion and intelligent modeling technology, the precision of the three-dimensional geologic model of conventional and unconventional oil and gas reservoir development is improved.

The invention provides a shale oil pyrolysis adsorption oil and free oil correction method based on a nuclear magnetic experiment, and belongs to the field of exploration and development of unconventional oil and gas fields. According to the method, on the basis of a shale rock physical experiment and a shale nuclear magnetic resonance experiment, the occurrence space and content of adsorbed oil are determined by using multi-state nuclear magnetic resonance experiments such as original sample, saturated oil, washing oil and different temperatures, so that a nuclear magnetic adsorbed oil model is constructed, and the content of the adsorbed oil is determined by further combining a different-temperature-order parallel crushed sample lithologic pyrolysis experiment-nuclear magnetic combined measurement experiment. The content of the free oil and the content of the adsorbed oil are calculated through the two-dimensional nuclear magnetism T1-T2 spectrum semaphore, the content of the free oil and the content of the adsorbed oil are compared and analyzed, the difference between the nuclear magnetism adsorbed oil and the pyrolysis adsorbed oil is matched with a free hydrocarbon curve to achieve adsorbed oil correction, and the free oil and the adsorbed oil are obtained.

The invention discloses a horizontal well fracturing perforation parameter optimization method and device considering non-uniform crustal stress and a medium, and relates to the field of unconventional oil and gas reservoir yield increase renovation. The method comprises the steps that a three-dimensional non-uniform crustal stress field of reservoir fracturing is constructed; the method comprises the following steps of: performing grid division on a hydraulic fracture by using a fracture unit, acting a three-dimensional non-uniform ground stress field on a divided grid, and establishing a constitutive model of reservoir rock deformation and stress in a hydraulic fracturing process; according to the constitutive model, establishing a flow model of the fracturing fluid in the horizontal shaft, the perforation hole and the hydraulic fracture; establishing an expansion criterion of the hydraulic fracture in the fracture length and fracture height directions; according to the expansion criterion and the flow model, the expansion results of the horizontal well fracturing cracks under different perforation parameters are simulated; and the horizontal well fracturing perforation parameters are optimized according to the expansion result. According to the method, the defects of a uniform crustal stress field assumption and a plane crack propagation assumption in the prior art are overcome, and the optimization of the horizontal well fracturing perforation parameters in the non-uniform crustal stress field is realized.

A method for controlling a fracture height in unconventional oil and gas reservoirs under multi-bedding interference is provided. The method includes: obtaining geological parameters of a target horizontal well, and determining a fracturing fluid and construction parameters based on a production capacity target of the target horizontal well; determining a hydraulic fracturing process of the target horizontal well based on a hydraulic fracturing model for processing the multi-bedding interference, and evaluating the fracture height; comparing the fracture height with an expected control height, if the fracture height is greater than the expected control height, reducing a displacement of the fracturing fluid or a total time of a hydraulic fracturing to update the construction parameters until the fracture height is less than the expected control height; and performing the hydraulic fracturing on the target horizontal well based on updated construction parameters.

The invention relates to the technical field of oil and gas field development engineering, in particular to an unconventional oil and gas reservoir fracturing flexible material assisted sand carrying-sand control whole process numerical simulation method which comprises the following steps: 1) acquiring a basic parameter data set; 2) respectively establishing corresponding liquid phase-solid phase interaction force models for the proppant and the flexible material; and 3) establishing a numerical model according to the liquid phase-solid phase interaction force model of the proppant and the flexible material, and simulating the whole process of flexible material-proppant cluster conveying, laying and backflow. Through the numerical simulation method provided by the invention, the change conditions of the flexible material-proppant cluster laying form, such as a visual cloud picture, an effective laying area, a particle average flow velocity change curve, flow conductivity and fracture permeability, under different working condition parameters can be simulated; therefore, objective evaluation of the efficient laying effect and the flow conductivity of the fracturing propping agent assisted by the flexible material is realized, and suggestions are provided for site construction parameter optimization.

The invention discloses a reservoir fracture distribution prediction method and system based on big data, and relates to the technical field of oil and gas field development, and the method comprises the steps of multi-source data collection and fusion, multi-scale feature extraction and optimization, hybrid model construction and three-dimensional fracture probability body generation, and fracture distribution prediction and visual display. According to the method, prediction blind areas are reduced by collecting multi-source heterogeneous data, physical constraints are achieved by introducing a Griffith criterion so as to enhance geological rationality, dynamic data and static geological data of fracturing construction are subjected to combined modeling, dynamic fusion of multi-source data is achieved, timeliness of crack prediction is improved, in addition, the physical constraint hybrid model is adopted, and the prediction efficiency is improved. And spatial characteristics and dynamic response are considered through a CNN-GBDT hybrid architecture, a fracture mechanics criterion is embedded to enhance interpretability, real-time access of logging-while-drilling data in the drilling process is supported, and key technical support can be provided for unconventional oil and gas development.

The invention discloses a method for predicting the adsorption property of gas in shale through an improved E-L-F model, and relates to the technical field of unconventional oil and gas development and carbon dioxide geological sequestration, and the method comprises the steps: providing an L-F improved adsorption model based on an L-F adsorption model in combination with a Langmuir + k isothermal adsorption model; based on the L-F improved adsorption model, an improved E-L-F adsorption model is provided in combination with an E-L adsorption model; and the precision of the improved E-L-F adsorption model is verified through experimental data fitting. According to the method, by fusing the Langmuir theory, the Freundlich theory and the Extended-Langmuir theory, an adsorbent heterogeneity parameter n, a high-pressure empirical parameter k and a parameter eta i representing the proportion of adsorption gas to adsorption sites are introduced, the surface characteristics and the high-pressure effect of an adsorption layer are effectively corrected, and the prediction precision of the adsorption amount of CH4 and CO2 in shale is remarkably improved. Experiments show that the average absolute relative deviation of the model in a single-component system and a mixed gas system is lower than 2.3%, and the model is suitable for optimal design of a CO2 enhanced shale gas exploitation technology and CO2 safety storage assessment.

The invention discloses a fracturing fluid spontaneous imbibition numerical simulation method considering chemical osmotic pressure, and belongs to the technical field of unconventional oil-gas exploration and development, and the fracturing fluid spontaneous imbibition numerical simulation method comprises the following steps: step 1, describing mathematical problems in a fracturing fluid spontaneous imbibition phenomenon, and carrying out mathematical model assumption; 2, determining the real speed of the water phase based on the seepage speed of the water phase; 3, determining a salt ion migration control equation under an oil-water two-phase flow condition; 4, based on the oil-water two-phase flow control equation considering the chemical osmotic pressure and the salt ion migration control equation under the oil-water two-phase flow condition, establishing a fracturing fluid spontaneous imbibition mathematical model considering the chemical osmotic pressure; 5, spatial discretization is conducted on the fracturing fluid spontaneous imbibition mathematical model; and step 6, determining spontaneous imbibition numerical simulation parameters, and performing numerical method solution on the fracturing fluid spontaneous imbibition mathematical model. According to the method, the accuracy of spontaneous imbibition numerical simulation of the fracturing fluid can be effectively improved.

The invention discloses a metal in-situ anchoring carbon nanocluster catalyst as well as a preparation method and application thereof, and belongs to the technical field of unconventional oil and gas resource development. The metal in-situ anchored carbon nano-cluster catalyst provided by the invention is amorphous nano-particles without pore channel confinement, all active sites are exposed on the surface, and macromolecular organic matters in an in-situ pyrolysis process can be directly adsorbed and activated; the metal center is anchored to a flexible carbon skeleton in an atomic scale through M-N-C and M-O-C coordination bonds, and high dispersity and structural stability are still kept at the formation temperature of 500 DEG C; meanwhile, the catalyst is easily and uniformly injected into an oil shale reservoir through fracturing fluid and is well dispersed in a complex pore network, and the solid-solid catalytic interface efficiency is remarkably improved; the catalyst does not have a strong acid center, promotes selective fracture of C-C / C-H bonds mainly through metal electron transfer, and reduces the risk of formation blockage; therefore, the method has a good application prospect in oil shale in-situ pyrolysis.

The invention provides a current crustal stress direction well profile continuous interpretation method. The method comprises the steps that S1, the current crustal stress direction is interpreted through multi-source data; s2, analyzing the applicability of the current crustal stress direction interpretation method; and S3, determining the continuous current crustal stress direction of the well section. According to the method, the current crustal stress direction in the longitudinal direction of the complex structure area such as wrinkle deformation and fracture can be accurately and continuously explained, support is provided for track optimization and borehole wall stability analysis of the horizontal well in the complex structure area, and safe and efficient exploitation of unconventional oil and gas resources is achieved.

The invention relates to the technical field of unconventional oil and gas reservoir exploitation, in particular to a tool capable of achieving full bore after intelligent opening of multiple sliding sleeves and a tool construction method, and aims to relieve the technical problem that the success rate is low when the sliding sleeves are opened in an intelligent mode in related technologies. According to the tool capable of achieving the full bore after the intelligent opening of the multiple sliding sleeves is pressed, when the first outer barrel is pressed, pressure acts on the first starting sliding sleeve, after a first fixing shear pin is cut off, the first starting sliding sleeve loses limitation, and the moving stroke is reserved for a first magnetic block; when the opening tool passes through the first magnetic block, the magnetic pole generated by the opening tool is the same as that generated by the inner end of the first magnetic block, the first magnetic block slides outwards in the radial direction of the first outer barrel, and therefore limitation to the inner sliding sleeve is relieved, the inner sliding sleeve slides by pressing the interior of the first outer barrel again, the through hole is not blocked any more, and the sliding sleeve assembly is opened. By means of the design, the influence of underground complex working conditions on sliding sleeve opening is effectively reduced, and the success rate of sliding sleeve opening is guaranteed.

The embodiment of the invention provides a fracturing staged clustering method and device for a horizontal well. The method comprises the steps that well periphery natural fracture distribution data and well logging interpretation data of a target horizontal well are obtained; according to the well periphery natural fracture distribution data and the well logging interpretation data, performing preliminary segmentation on a well periphery reservoir of the target horizontal well to obtain different types of reservoirs; horizontal well clustering fracturing crack propagation models are constructed for the different types of reservoirs respectively; performing fracture propagation simulation according to the horizontal well clustering fracturing fracture propagation model to obtain a fracturing fracture form; determining single-section perforation cluster parameters of different types of reservoirs according to the fracturing fracture form; and according to the single-section perforation cluster parameters and the well logging interpretation data, the specific section position and the perforation cluster position of the target horizontal well are determined. According to the method, the unconventional oil and gas reservoir fracturing transformation effect can be improved.

The invention discloses a three-dimensional oil saturation imaging method and system based on multi-frequency electromagnetic-acoustic wave coupling, and the method comprises the following steps: transmitting an electromagnetic wave signal to a stratum through a multi-frequency electromagnetic array, and receiving an electromagnetic response signal reflected by the stratum; synchronously transmitting high-frequency sound wave pulses, collecting sound wave reflection signals and extracting stratum interface information; the formation resistivity distribution is calculated based on the electromagnetic response signal, the formation boundary is constrained by combining the sound wave reflection signal, and the resistivity multiplicity is eliminated through a joint inversion algorithm; utilizing a deep learning model to fuse electromagnetic and sound wave data, and constructing an oil saturation three-dimensional grid model; and three-dimensional saturation distribution is dynamically displayed through a visual platform, and injection-production scheme optimization is guided. The method is high in resolution, low in condition dependence degree, low in cost and high in modeling precision, achieves three-dimensional perspective oil reservoir through multi-physics field coupling and high-precision three-dimensional modeling, is suitable for remaining oil potential tapping, unconventional oil and gas development and carbon sequestration monitoring, and facilitates intelligent oil field construction.

In order to solve the problems of high calculation complexity and low efficiency in hydraulic fracturing numerical simulation, the invention provides a method for parallel simulation of hydraulic fracturing crack propagation. A three-dimensional fracture grid is constructed by adopting a displacement discontinuity method (DDM) and a finite volume method (FVM), and stress and fluid pressure distribution in fractures are calculated. Crack expansion is driven by optimizing DDM stress coefficient matrix generation and combining FVM to calculate crack tip pressure. OpenMP multi-thread scheduling and Intel MKL and Eigen library optimization are adopted, LU or QR decomposition is dynamically selected according to the matrix scale, and therefore the calculation efficiency is improved. According to the method, by initializing a three-dimensional fracture grid, optimizing a stress matrix, constructing a fluid-solid coupling equation set, carrying out iterative solution, checking convergence and generating a three-dimensional fracture expansion model, efficient fracture expansion simulation is achieved, and an efficient and accurate numerical tool is provided for fracture design of unconventional oil and gas reservoirs.

The invention discloses a CO2-heavy salt water collaborative sealing device and sealing method, and relates to the technical field of crossing of unconventional oil and gas reservoir development and carbon sealing technology, a drilling structure extends to a fluid sealing storage layer from the earth surface in the vertical direction, and the part, located on the fluid sealing storage layer, of the drilling structure gradually inclines in the horizontal direction from top to bottom; the bottom end of the base extends in the horizontal direction; the casing pipe structure is arranged in the well drilling structure and extends synchronously with the well drilling structure, and a well cementation structure is arranged between the part, located above the fluid seal storage layer, of the casing pipe structure and the well drilling structure; the sleeve structure is located in the fluid sealing storage layer, and a liquid outlet is formed in the horizontally-extending part of the sleeve structure. The inner pipe structure is located in the sleeve structure, a gap is formed between the inner pipe structure and the sleeve structure, the bottom end of the inner pipe structure is located in the horizontally-extending part of the sleeve structure and provided with a gas outlet, and the problem that in the prior art, the absorption efficiency is low in the gas-liquid fluid mixing process, and consequently efficient fluid mixing cannot be achieved is solved.

The invention relates to a high-pressure hydrogen nano-pore permeability testing device and method based on double-chamber pressure balance, and belongs to the technical field of unconventional oil gas. The device comprises a high-pressure gas source, a pressurization module, a double-layer nested core reaction kettle module and a high-frequency data acquisition and safety monitoring module; by constructing a double-layer nested structure that inner cavity hydrogen is actively wrapped by outer cavity nitrogen and cooperating with an all-metal knife edge hard sealing device and a different flow pattern permeability calculation method, accurate measurement of the Ndarcy grade permeability of the compact cover rock is successfully achieved, the industrial pain point that a traditional device is inaccurate in measurement, unstable in measurement and unsafe is thoroughly solved, and the method is suitable for large-scale popularization and application. And key experimental technology guarantee and scientific data support are provided for closure evaluation of underground hydrogen storage engineering and exploration and development of natural hydrogen resources.

The invention provides a mixing control method, device and equipment for oil field dry powder fracturing fluid and a medium. The method comprises the steps that mixing process data are collected in real time; establishing a virtual model based on the internal structure of the target equipment; performing dynamic simulation on fluid flow in the liquid preparation tank by using fluid dynamics, and constructing a real-time fluid motion model; based on a chemical kinetics principle, establishing a chemical kinetics model of dry powder dissolution, cross-linking reaction and gel breaking reaction, and fusing material characteristic parameters into the chemical kinetics model; inputting data of the mixing process into the virtual model, performing dynamic calibration on the virtual model through a real-time fluid motion model and a chemical kinetic model, dynamically adjusting water quality data, a material ratio and stirring conditions, and performing multi-scene real-time simulation analysis on the mixing process; and executing corresponding dry powder fracturing fluid blending control on the target equipment according to the blending simulation data. The fracturing fluid mixing quality and efficiency can be improved, and the development efficiency of unconventional oil and gas reservoirs can be improved in an auxiliary mode.

The invention relates to the technical field of unconventional oil-gas exploration, in particular to a high-clay shale oil in-situ accumulation dynamics mechanism and mode evaluation method. The method comprises the following steps: collecting fluid pressure, temperature data, displacement pressure, oiliness, brittleness index, hydrostatic pressure, vitrinite reflectivity and density value of a shale sample at each depth position point of an exploratory well of each exploration point; calculating abnormal sensitivity; further acquiring ground temperature evaluation credibility; obtaining a self-adaptive fitting weight; acquiring the actual fluid pressure of the exploratory well of each survey point at each depth; acquiring the pressure coefficient of the shale sample at each depth position point of the exploratory well of each survey point; obtaining a self-sealing reservoir forming mode and a retention reservoir forming mode of shale oil; based on the vitrinite reflectivity, the oiliness, the brittleness index and the pressure coefficient, a shale oil enrichment area evaluation comprehensive index is constructed, and the in-situ flow of the high-clay shale is evaluated. According to the method, the accuracy of in-situ self-sealing reservoir formation, retention reservoir formation and dynamic mechanism evaluation of the high-clay shale is improved.

The invention relates to the technical field of unconventional oil-gas exploration, in particular to a well-seismic integrated geological model intelligent construction and reservoir gas-bearing prediction system, which is characterized in that a data acquisition and preprocessing module generates multi-dimensional feature mapping through wavelet transform denoising and principal component analysis; the well-seismic integrated modeling module adopts a Transform and BiGRU hybrid model to fuse well-seismic data, and constructs a three-dimensional geologic model adaptive to a fracture network; the dynamic gas-bearing prediction module is used for predicting an adsorbed gas / free gas ratio and gas saturation based on a Monte Carlo-Bayesian framework; the real-time iteration module corrects model parameters through online optimization and multi-source data feedback; and the output and visualization module generates a dynamic distribution diagram and an uncertainty interval, and through efficient multi-source data processing, construction of a high-precision three-dimensional geologic model, dynamic prediction of gas content and quantification of uncertainty, prediction precision, timeliness and decision reliability of exploration are improved in combination with real-time iterative optimization of the model and visualization output.

The invention discloses a method for enhancing coalbed methane recovery efficiency by an external magnetic field, which comprises the following steps of: arranging a plurality of electrified coils or magnetic field generators connected with a power supply in a coalbed to generate an alternating magnetic field in the coalbed; cH4 molecules show diamagnetism under the action of a magnetic field, a repulsive effect is generated in a coal seam, and the adsorption effect of CH4 and a coal body is weakened; and on the other hand, as the coal body contains ferromagnetic or paramagnetic minerals, the alternating magnetic field excites the annular eddy current in the coal body through electromagnetic induction so as to generate Joule heat. Therefore, coal matrix expansion and microfracture expansion can be induced by temperature rise of the coal body, the permeability of the coal body is further improved, and more channels are provided for CH4 desorption and flowing; the clean, efficient and environment-friendly coal bed gas exploitation method is provided on the basis of superposition of multiple production increasing mechanisms, and a new technical approach is provided for exploration and development of unconventional oil and gas resources.

The application discloses a method for controlling and managing casing deformation of an unconventional oil and gas well, which comprises the following steps: evaluating casing deformation risks existing in a single section of a gas well, and determining which casing deformation risks exist in the single section of the gas well, wherein the casing deformation risks include fault development, natural fracture development, microstructure development, frequent layer crossing, poor cementing quality and hole diameter expansion; and corresponding control methods are performed according to different types of risks. The application realizes effective control and management of casing deformation without carrying out geological modeling and fracturing simulation and without lowering high-cost monitoring instruments.

The present invention relates to the technical field of chemical experimental equipment for oil and gas fields, and specifically to a fracturing fluid reservoir damage evaluation device and an operating method thereof, which is composed of a liquid storage tank, a chromatography device, a bracket, a receiving container and a height adjuster; the present invention utilizes the characteristics of different liquids passing through a porous medium at different times and rates during the filtration of a porous medium, and lays silica gel particles of different particle sizes on a chromatography column to form a porous structure, simulates the structure of an unconventional oil and gas reservoir to evaluate the degree of damage caused by the fracturing fluid to the reservoir, and screens out the fracturing fluid that can protect the unconventional oil and gas reservoir. The experiment of the present invention is carried out at normal temperature and pressure, avoiding the experimental risk of high-pressure displacement, and the liquid can be automatically added to the chromatography column by adjusting the height of the liquid storage tank, which will not cause the shaking of the liquid in the chromatography column, avoiding the experimental error caused by direct liquid addition, and the operation method is simple and convenient to control, solving the problems of long experimental cycle and high experimental cost of existing reservoir damage evaluation experiments.

The invention designs an environment-friendly blowout device suitable for a high-salinity gas well, and belongs to the technical field of unconventional petroleum and natural gas extraction. The device comprises a two-stage concentric liquid remover and a combustion purification system which are connected in sequence. The two-stage concentric liquid remover realizes efficient separation of gas, liquid and solid phases through two-stage centrifugal separation. And a self-adaptive liquid discharge and gas control mechanism is arranged at the bottom of the two-stage concentric liquid remover, so that flow fluctuation self-adaptive sealing can be realized. Pretreated gas enters a combustion tank, is discharged through a torch pipe and is ignited, and generated combustion gas and solid particles are sprayed and purified in all directions and sprayed liquid is recycled through a spraying and recycling device above the combustion gas and the solid particles. The device integrates multiple technical functions such as buffering and pressure stabilizing, multi-phase separation, all-directional spraying purification, fire-liquid isolation, flow fluctuation self-adaption, automatic sealing, explosion prevention and fire retardance, the three-phase separation efficiency is remarkably improved, salting-out particles entering the environment are reduced, and equipment and technical supports are provided for green development of a hypersalinity gas well.

The invention belongs to the technical field of rock mass engineering and oil and gas resource development, and discloses a hydraulic fracture monitoring method based on pump injection curve fluctuation frequency. According to the hydraulic fracture monitoring method, in the on-site fracturing process, the expansion degree and the fracture type of the hydraulic fracture in the reservoir are preliminarily judged by comparing the fluctuation degree of the on-site pump injection curve monitored in real time with the fluctuation degree of the test pump injection curve. According to the corresponding relation between the fluctuation degree of the pumping curve and the hydraulic fracture obtained through the method, the expansion degree and the fracture type of the hydraulic fracture in a fracturing site can be economically and efficiently judged, and the problems that fracture monitoring in previous fracturing engineering is greatly influenced by the environment and high in cost are solved. Therefore, the method can reduce the time and economic cost of hydraulic fracture field monitoring, and provides reference for unconventional oil and gas exploitation design and evaluation.