128 results about "Hydraulic fracturing" patented technology

A hydraulic fracturing process comprises, during a time interval T1, pumping a first fracturing fluid comprising first coke proppant particles into a subterranean formation, such that a first weight of the first coke proppant particles, WCP1, is pumped into the subterranean formation. The process also comprises, during a time interval T2 that occurs before or after T1, pumping a second fracturing fluid differing from the first fracturing fluid and comprising non-coke proppant particles and optionally second coke proppant particles into the subterranean formation, such that a second weight of the second coke proppant particles, if any, WCP2, is pumped into the subterranean formation, where WCP1 / WCP2≥1.2.

A method for performing a refracturing operation using coke proppant particles comprises refracturing a subterranean formation that has been previously hydraulically fractured with respect to a hydrocarbon well by injecting a fracturing fluid comprising a carrier fluid and coke proppant particles into the subterranean formation via a wellbore of the hydrocarbon well.

This invention belongs to the field of oil and gas development and exploitation engineering technology, specifically relating to a method for determining the initiation zone and sequence of fractures during multi-layer fracturing and filling operations in loose sandstone reservoirs. Based on the basic physical properties and pumping parameters of each sub-layer, this invention establishes the time-varying process of fluid absorption and wellbore pressure at each sub-layer during multi-layer fracturing and filling operations, enabling rapid identification of sub-layers that have initiated fractures and those that have not. Furthermore, based on the fractured sub-layers, this invention iteratively corrects the fluid absorption capacity of each sub-layer and calculates the changes in fluid pressure at the wellbore of the un-fractured sub-layers, thus determining the sub-layers that will subsequently initiate fractures at each stage. This provides the order and timing of fracture initiation for construction design and on-site analysis, offering a basis for construction design and field analysis.

This invention belongs to the field of fracture characterization and reservoir hydraulic fracturing simulation technology. It discloses a method and related equipment for characterizing natural fractures and simulating reservoir damage evolution using a phase-field model. By distinguishing primary and secondary natural fractures based on a discrete fracture network and constructing a model, it achieves accurate characterization of the different sizes and spatial heterogeneity of primary / secondary natural fractures in the model. Natural fractures are characterized as mechanically weak surfaces with differentiated parameters. Hydraulic fractures can capture and interact with natural fractures. Combining a phase-field damage model and a rock mechanics constitutive model, it can accurately simulate key behaviors such as activation and deflection during natural fracture propagation without pre-setting fracture paths, avoiding numerical instability and low computational efficiency. Through dynamic coupling analysis of the entire fluid-solid-damage process, it takes into account the influence of multiple factors such as geostress and fluid pressure, improving the accuracy of phase-field simulation, reducing simulation distortion, providing reliable support for fracturing design optimization, helping to improve reservoir stimulation effects and production benefits, and ensuring the smooth implementation of fracturing processes.

This invention discloses a system for evaluating, monitoring, and warning the effectiveness of hydraulic fracturing in deep mines. The system comprises a data acquisition layer, a data processing layer, an intelligent analysis layer, a visualization layer, and an application layer. This invention constructs a standardized engineering database by integrating geological, construction, and microseismic monitoring data; it utilizes fractal geometry theory and dynamic inversion algorithms to build a digital three-dimensional fracture network model; it performs parallel calculations of multi-dimensional quantitative evaluation indicators such as pressure relief effect, fracture system effectiveness, and achievement of engineering objectives; and it combines machine learning models for intelligent diagnosis and graded early warning. This invention solves the problems of existing technologies, such as single evaluation dimensions, reliance on experience, and delayed early warning. It realizes the transformation of fracturing effect evaluation from experience-based judgment to multi-dimensional quantitative intelligent evaluation, and the leap from passive response to proactive early warning, providing precise decision support for safe and efficient mining in deep mines.

The application discloses a kind of based on microseismic crack face construction and seepage evaluation method, belong to geological analysis technical field.Use hydraulic fracturing to the detection area, the microseismic source position identification generated by rock mass rupture;Determine the best fitting crack plane from the clustered microseismic source position, extract the spatial orientation information of hydraulic fracturing induced crack;Reconstruct the spatial distribution range of hydraulic fracturing induced crack in the plane, obtain the induced crack geometry of limited scale;Discretize the geometry of induced crack face, construct a simplified hydraulic fracture plane at the perforation location and discretize, form the crack geometry set containing induced crack and hydraulic fracture;Embed the crack geometry set containing induced crack and hydraulic fracture into the rock geometry model, carry out reservoir seepage simulation under real working conditions, quantitative evaluation.It is simple in steps, convenient to use, and has good imaging effect.

The application discloses a deep coal seam no-roadway gas extraction and deep geothermal resource exploitation integrated method, which comprises the following steps: S1, constructing a U-shaped well; S2, arranging a double-layer casing assembly in the U-shaped well; S3, arranging a plurality of annular packers on the double-layer casing assembly in the horizontal well section, and then connecting the double-layer casing assemblies in sections into an integrated whole; S4, performing hydraulic fracturing on the horizontal well section through the double-layer casing assembly; and S5, extracting gas through the double-layer casing assembly, and injecting cold water through the double-layer casing assembly, so that the high-temperature gas exchanges heat with the cold water, and the cold water is heated to become hot water. The application realizes deep coal seam no-roadway gas extraction and deep geothermal resource exploitation, solves the problem that deep coal seam gas is difficult to extract when shallow coal seams are exploited, reasonably exploits coal seam gas resources, reduces the gas extraction engineering quantity, and utilizes geothermal resources, thereby bringing more benefits to coal mines.

The present application relates to coal mining technical field, provide a kind of method for determining the effective influence radius of hydraulic fracturing, comprising the following steps: S1, drilling fracturing borehole in target rock formation;S2, respectively drilling first observation borehole and second observation borehole on the two sides of the fracturing borehole, the interval D1 between the first observation borehole and the fracturing borehole is less than the interval D2 between the second observation borehole and the fracturing borehole;S3, the original water quantity of the first observation borehole and the second observation borehole is determined, then the fracturing borehole is subjected to hydraulic fracturing;S4, according to the water quantity change of the first observation borehole and the second observation borehole, determine the effective influence radius R of hydraulic fracturing.The method greatly reduces the initial workload and material cost of drilling construction, hole sealing and instrument installation, so that the field test work can be quickly started and completed, and the time for determining the radius of hydraulic fracturing is greatly reduced.

This invention relates to a ball-operated plugging device for downhole pulsating hydraulic fracturing, comprising a main body assembly. A conical valve seat is disposed in the middle of the main body assembly, and an umbrella-shaped valve is slidably connected within the conical valve seat. The umbrella-shaped valve includes a valve head boss and a valve stem. A self-excited oscillation chamber is also provided at the bottom of the conical valve seat. A spring support seat is disposed below the self-excited oscillation chamber, with a central circular hole at the geometric center of the spring support seat. A spring is placed on the spring support seat, and the top of the spring contacts the valve head boss of the umbrella-shaped valve. A through-hole flow channel is provided in the middle of the umbrella-shaped valve, with its upper and lower ends communicating with cavity A and cavity B, respectively. The valve stem of the umbrella-shaped valve passes through the spring, and its bottom is inserted into the central circular hole of the spring support seat. A spherical groove is provided at the top of the umbrella-shaped valve for placing a soluble plugging ball. This invention can adjust the pressure variation of the pulsating fluid at the bottom of the well during construction.

A manifold assembly includes a high-pressure section including a module with one or more side inlets and a mounting block assembly including a template mounted on the module, a cavity defined through the template, and one or more brackets disposed in the cavity and configured to support a portion of a piping assembly passing through the cavity.

The application discloses a drilling blowout prevention and gas extraction integrated hole sealing device and method, which comprises a sleeve, a tee joint, a gas extraction pipe and a surge bag. The integrated hole sealing device is installed at a control hole, at which time gas extraction operation can be performed on each control hole, and then hydraulic fracturing operation is continuously performed in a burst pressure hole. After one of the control holes is connected with a crack generated by the burst pressure hole, part of the gas and water-coal mixture will be discharged into the surge bag from the control hole. The surge bag is rapidly expanded from a folded state, thereby playing a buffering role. The control hole can extract gas, discharge water and discharge residue, the danger of a large amount of gas and water-coal mixture being suddenly discharged from the control hole is avoided, and whether each control hole is connected with the burst pressure hole can be known by observing the change of the surge bag. The control hole is temporarily blocked, thereby facilitating the continuous fracturing operation on other control holes, and finally all the control holes can be efficiently and accurately connected during the hydraulic fracturing process of the burst pressure hole.

The application discloses a coal rock hydraulic fracturing signal identification method based on an MLP neural network model, microseismic characteristic parameters capable of representing different coal rock lithologies are screened out first, then microseismic characteristic parameters corresponding to different types of coal rock lithologies are obtained, and the above data is divided into a training set and a verification set; then an MLP neural network model with a specific structure is constructed, the model is trained and learned by using the training set, the weights and bias terms of the MLP neural network model are optimized and updated by using a BP algorithm, after the optimization training is finally completed, all microseismic data in the hydraulic fracturing process are input into the model, the model can accurately output the coal rock lithology labels corresponding to each group of data after identification, and the coal rock hydraulic fracturing signal distinguishing process is completed; thereby, the lithology and horizon information of the hydraulic fracturing coal rock rupture are identified, the search range of microseismic positioning inversion is reduced, and finally the efficiency and accuracy of the microseismic positioning inversion are effectively improved.

The present disclosure relates to a kind of water deep penetration guide seam fracturing reservoir engineering design methods, comprising: using water deep penetration perforation method, drill open horizontal long hole in the top of thick oil layer, the horizontal long hole is drilled in low water content direction on plane, and drainage channel is formed in the part where water drive oil capacity is weak;The penetration length of the water deep penetration perforation is determined according to the development thickness of oil layer, injection-production connection relationship, injection-production distance, the number of perforation is in the same direction on the top of each subdivision layer blocked by interlayer, and it is 0.2-0.4m away from upper barrier or interlayer;After the water deep penetration perforation, hydraulic fracturing is carried out to form artificial fracture, let the drilled horizontal long hole guide the longitudinal position and horizontal trend of artificial fracture, to improve the flow conductivity again, realize the purpose of "targeting" tapping of remaining oil enrichment site in the cubic of injection-production well positive rhythm oil layer.

This invention relates to the technical field of deep well mining, and particularly to a real-time analysis and early warning method for true triaxial hydraulic fracturing test data. The method includes the following steps: acquiring multi-source monitoring data during the true triaxial hydraulic fracturing test, wherein the multi-source monitoring data includes mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; assigning verification weights matching the test conditions based on the heterogeneous attributes of the mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; and verifying the acquisition timestamps and range matching of each data point using the verification weights to generate a standard dataset. The real-time analysis and early warning method for true triaxial hydraulic fracturing test data provided by this invention can simultaneously capture the stress field, fluid transport, deformation state, and internal fracture evolution characteristics of rock samples, improving the comprehensiveness of rock sample condition characterization and solving the problem of one-sided condition perception.

The application discloses an in-layer well arrangement method for deep shale gas and a related device, relates to the technical field of oil and gas field development, and comprises the following steps: performing geological sweet spot evaluation on reservoir geological parameters, performing engineering sweet spot evaluation on engineering parameters, obtaining the geological sweet spot evaluation result and the engineering sweet spot evaluation result, and determining a platinum target body of a target block; obtaining position parameters of a lower high-quality target layer section and an upper high-quality target layer section in the platinum target body; generating an in-layer initial well arrangement scheme based on the position parameters; inputting the in-layer initial well arrangement scheme into a hydraulic fracturing numerical simulation model; carrying out multiple-group hydraulic fracturing numerical simulation; obtaining crack shape data and post-production pressure evolution data corresponding to each group of simulation results; comparing and analyzing each group of simulation results according to the crack shape data and the post-production pressure evolution data; and outputting an optimal inter-well spacing and an optimal longitudinal target body combination. The application significantly reduces the risk of inter-well channeling, improves single-well productivity and the overall development efficiency of a platform.

The application provides an ultrasonic-hydraulic coupling fracturing coal seam permeability increasing method and system, and the permeability increasing method comprises the following steps: obtaining coal seam plasticity, brittleness and crack development degree parameters; comparing threshold value preselection modes, the plasticity index is greater than threshold value preselection mode one, ultrasonic pretreatment is performed on conventional hydraulic fracturing, the plasticity index and the crack development degree are both greater than threshold value preselection mode two, ultrasonic-hydraulic synchronous fracturing is performed, otherwise, conventional hydraulic fracturing is performed and mode three is on standby; corresponding fracturing modes are executed, construction parameters are monitored in real time, mode three based on cavitation effect is triggered for crack network reconstruction and plugging removal in case of abnormality; the process is stopped when the standard is met, otherwise, mode three is repeated. The application is suitable for different coal seam characteristics, ultrasonic pretreatment reduces the difficulty of crack initiation, synchronous fracturing optimizes crack morphology, abnormal plugging removal guarantees the effect, improves the coal seam permeability and construction efficiency, and reduces energy consumption and risks.

The present application relates to the technical field of coal mine disaster prevention, and discloses a coal mine complex structure water control and anti-scouring device and a use method, which comprises a drill rod body and a drill bit, the drill bit is installed at the front end of the drill rod body, a grouting channel and a fracturing channel are integrated in the drill rod body, and an inflatable sealing element is arranged in the drill rod body; a fluid supply assembly comprises a slurry supply element and a water source supply element, the slurry supply element and the water source supply element are respectively connected with the grouting channel, the fracturing channel and a cleaning channel; a monitoring control assembly comprises a flow monitoring element and a pressure monitoring element, and is electrically connected with the fluid supply assembly and the drill rod, and is used for monitoring operation parameters in real time and regulating the working state of each component. Through integrated design, grouting plugging, drilling cleaning and hydraulic fracturing operation are completed in a single drilling, a stress transfer, water power dredging, energy release and artificial water guide pressure relief structure is constructed, the stress field and the seepage field are synchronously regulated, the complex disaster is radically cured, and the treatment efficiency, precision and safety are improved.

The utility model discloses a water -cooled coal bed gas hydraulic fracturing system, this system passes through integrated high -efficient water -cooling unit, effectively solved traditional coal bed gas hydraulic fracturing system in air -cooled heat dissipation efficiency low, energy consumption is high, loud and frequent maintenance technical problem. System adopts plate heat exchanger and circulating cooling water system, has realized the accurate control of hydraulic oil temperature, has improved system energy efficiency and operating stability significantly, especially suitable for coal mine underground limited space and high dust environment. The system has heat dissipation efficiency high, compact structure, energy consumption is low and maintenance cycle long etc. advantage, provides strong support for the efficient exploitation of coal bed gas.

This invention provides a repeated fracturing method using flexible knotted temporary plugging balls to seal perforations, belonging to the field of oil and gas field development. The method first identifies oil and gas enrichment zones and completes wellbore pretreatment. Then, slickwater is injected to divide the horizontal well section into three zones based on pressure drop and flow velocity. Gel fracturing fluid is injected into the high-filtration-velocity zone to seal old fractures. Subsequently, temporary plugging balls of different sizes are deployed according to the characteristics of each zone, with pressure-flow dual monitoring to address leakage and accumulation. Mixed sand hydraulic fracturing is injected and parameters are dynamically adjusted. Finally, the wellbore is cleaned and the effect is evaluated. This invention solves the problem of leakage and accumulation of temporary plugging balls due to uneven flow field in the horizontal section, reducing the leakage rate to below 8% and the accumulation rate to below 5%, with a target perforation reach rate exceeding 92%, significantly improving reservoir stimulation effectiveness and production capacity.

The application provides a low-permeability rock layer pulse type hydraulic fracturing device and a pulse fracturing method, relates to the technical field of fracturing devices, and discloses the following technical scheme: a fracturing rod is provided with a front end blocking air bag and a rear end blocking air bag at the front end and the rear end of the fracturing rod, respectively; a pair of auxiliary fracturing air bag sliding sleeves are further arranged on the rod body between the front end blocking air bag and the rear end blocking air bag; the fracturing hole comprises a front section fracturing hole, a middle section fracturing hole and a rear section fracturing hole; the displacement generated by the auxiliary fracturing air bag sliding sleeves is used for positioning the fracturing position; and the front section fracturing hole, the middle section fracturing hole and the rear section fracturing hole are used for partition fracturing. The power transmission is more efficient, so that the propelling rod no longer bears huge propelling pressure, and the risk of damage is reduced; low-amplitude pulse pressure and high-amplitude pulse fracturing are used for fracturing according to the rock fracture opening and the distribution range, a low-permeability rock layer pulse fracturing method is formed, accurate and efficient fracturing of the low-permeability rock layer is realized, and more uniform fracturing effect is ensured.

The application discloses a kind of deep-buried mine thick coal seam hard roof partitioned cooperative fracturing method.Working face hard roof breakage position is determined, according to hard thick roof constraint boundary condition, the position of roof breakage is determined;Affected by the goaf of last working face, the roof of mining working face presents different boundary conditions on its two side coal pillars, wherein simply supported is formed at the section coal pillar of empty side, solid side section coal pillar forms fixed support, while the roof in goaf is difficult to form hinged structure, according to the layout of adjacent working face, the hard thick roof is regarded as a whole, different fracturing means are used in empty side and solid side roadway, and partitioned pressure relief is implemented, hydraulic fracturing fracturing method is implemented in the roadway of empty side of working face, and blasting fracturing method is implemented in the roadway of solid side.The application will solve the problem of hard thick roof strong rock pressure prevention and control in deep-buried mine thick coal seam, help to prevent and control the appearance of deep-buried mine strong rock pressure, and can also scientifically control the sudden instability of hard thick roof breakage.

A method and system for calculating an extension length of a main fracture in hydraulic fracturing, and a medium are provided. The method includes: acquiring a water hammer wave signal at a wellhead after pump shutdown during hydraulic fracturing; obtaining a time for a water hammer wave to travel from the wellhead to a bridge plug; calculating an average velocity of the water hammer wave moving in a well; performing a Fourier transform on a local signal with linear trend removed, to obtain a frequency spectrum of the local signal of the water hammer wave; extracting a fundamental frequency corresponding to a maximum value point in the frequency spectrum of the local signal of the water hammer wave as a response frequency in a main fracture; calculating a propagation time of the water hammer wave in the main fracture; and calculating an extension length of the main fracture.

The completions process eliminates the Oil & Gas Industry's need for fracking and improves the production process. This process uses energy and electricity, instead of chemicals and hydraulic fracturing to create pathways (fractures) which enable the formation to deliver petroleum fluids to the surface. This process reduces our carbon footprint and eliminates the chemical dangers to the water table and threat of earthquakes.

A hydraulic fracturing system with damage accumulation monitoring includes a plurality of hydraulic fracturing equipment positioned at a wellsite, including one or more pumps configured to pressurize a fracturing fluid and a distribution system fluidly coupled to receive and consolidate fracturing fluid from the plurality of pumps for injection into a wellhead. The hydraulic fracturing system also includes a damage accumulation monitoring system, including a plurality of sensing devices integrated into respective components of the plurality of hydraulic fracturing equipment, the plurality of sensing devices configured to measure a plurality of usage parameters of the respective components, and a processing device configured to receive the plurality of usage parameters and determine respective damage accumulation measurements of the respective components based at least in part on the usage parameters.

This invention relates to the field of underground gas extraction in coal mines, specifically to a deep-hole regionalized gas extraction process for coal mines. The process includes area division and geological assessment; drilling operations are conducted by using a directional drilling rig to drive the drill bit and cutting device towards the extraction unit; the directional drilling rig is then fed in reverse; the water injection pressure of the clean water pump is controlled to be greater than the elastic force of spring one of the cutting device, thus pushing the cutting body of the cutting device to perform a flapping motion; the water injection pressure of the clean water pump is also controlled to be greater than the elastic force of spring two of the cutting device, causing water to be sprayed through the nozzle of the cutting device towards the borehole wall, stimulating the borehole wall to expand and generate new cracks; after the drill bit is removed from the borehole, pipes are installed inside the borehole. This invention provides a convenient, remotely controlled deep-hole regionalized gas extraction process for coal mines, facilitating hydraulic fracturing operations.

This invention discloses a method and system for collaborative identification of hydraulic fracturing construction anomalies and fracturing effectiveness. It collects geological data of the fracturing reservoir and multi-source construction data, and performs standardized preprocessing. The fracturing construction process is divided into multiple core stages, and real-time stage status identification is performed. Multi-source dimensional features are extracted for each identification stage, and fracturing initiation confidence index, expansion effectiveness index, and anomaly risk index are constructed and calculated. Based on the three core indices and stage status variables, the types of construction anomalies are classified and identified. Simultaneously, a comprehensive score for fracturing effectiveness is calculated and effectiveness levels are assigned. Finally, matching construction and treatment suggestions are output in a linked manner. This invention achieves collaborative identification of rapid anomaly conditions and real-time evaluation of fracturing effectiveness during fracturing construction. It relies only on low-cost monitoring parameters easily obtained in underground coal mines. Through phased dynamic modeling, it significantly reduces the cross-stage misjudgment rate, fully meeting the on-site engineering needs of "construction, identification, and adjustment simultaneously" in underground coal mine fracturing.

The invention discloses a hydraulic fracturing ground microseismic event positioning method, a storage medium and equipment, and the method comprises the following steps: 1) carrying out the space grid division of a fracturing operation region through employing a multi-stage grid, building a multi-stage index file, and initializing a dynamic correction library file; 2) establishing a 3D layered velocity model; (3) ray tracing is completed according to the node coordinate parameters of space gridding, the speed model and the coordinates of the detection points, and a time difference curve of each grid point is obtained; 4) establishing a dynamic correction library according to the time difference curve of each grid point; 5) performing time difference adjustment on the original microseism profile, and performing event detection on the adjusted profile; and 6) performing energy scanning and positioning on the microseism event by adopting a mesh generation offset superposition method. According to the method, the 3D speed model with the occurrence and the static dynamic correction library are adopted, the positioning data processing efficiency can be improved, and the overall form of the positioning result can be closer to the real fracturing condition.

The present application belongs to the technical field of hot dry rock development, and particularly relates to a fracturing fluid thickening agent for hot dry rock hydraulic fracturing and a preparation method thereof. The fracturing fluid thickening agent for hot dry rock hydraulic fracturing comprises the following raw material components in parts by weight: acrylamide 14-18 parts, 2-acrylamide-2-methylpropanesulfonic acid 6-8 parts, methyl methacryloyloxymethyl trimethoxysilane 4-6 parts, sodium p-styrenesulfonate 3-5 parts, water 60 parts, emulsifier 4-6 parts, and white oil 25-45 parts. The fracturing fluid thickening agent for hot dry rock hydraulic fracturing provided by the present application can realize hydrophobic association thickening in water, has high drag reduction performance at low viscosity under high temperature, has good temperature resistance and shear resistance at high viscosity, has good stability, and can meet construction requirements.