1907 results about "Hydraulic fracturing" patented technology

The present invention relates to the technical field of oil and natural gas exploitation, and discloses a real-time monitoring and intelligent control system for hydraulic fracturing cracks in oil reservoirs, including: a real-time monitoring module, which is used to collect crack geometric morphology parameters and construction operation parameters in real time during crack expansion; a nonlinear modeling module, which is connected to the real-time monitoring module, and is used to construct a nonlinear dynamic model of crack expansion according to the collected crack expansion parameters and construction operation parameters, and output a predicted value of crack morphology; an optimization control module, which is connected to the nonlinear modeling module, and is used to calculate the optimized construction parameters according to the nonlinear dynamic model, including injection pressure, injection flow rate and viscosity of fracturing fluid. The present invention realizes precise control of crack expansion, intelligent optimization of construction parameters and efficiency improvement through the closed-loop linkage of real-time monitoring, nonlinear modeling, optimization control and feedback execution.

The present invention belongs to the technical field of fracture network optimization in oilfield exploitation. Specifically disclosed are a method and system for optimizing complex fracture networks in shale reservoirs. The method comprises: S1, on the basis of geological-engineering bimodal data fusion, constructing a three-dimensional digital twin of heterogeneous reservoirs; S2, synchronously calculating the interactions among fluid flow, rock fracturing and proppant transport during a hydraulic fracturing process; and S3, automatically and iteratively optimizing a combination of fracturing operation parameters. By means of constructing a closed-loop system consisting of geological modeling, multi-field coupling simulation, intelligent optimization and dynamic correction, efficient design and real-time optimization of complex fracture networks in shale reservoirs are realized.

The invention relates to the technical field of oil and gas field development, and discloses an ultra-large type true triaxial hydraulic fracturing fracture evolution path prediction method and system.The prediction method comprises the steps that a coupling geomechanical model integrating microscopic, macroscopic and wellbore flow scales is constructed; initializing the model and performing crack initial expansion simulation; collecting construction data in real time, and dynamically optimizing model parameters through a data assimilation algorithm; performing fracture evolution advanced prediction by using the updated model; and generating an optimization decision based on the prediction result and feeding back to the construction site. According to the method, fusion of a multi-scale physical mechanism and real-time dynamic prediction is realized, and accurate prediction and active control can be performed on crack expansion under the ultra-large true triaxial condition.

The invention relates to the technical field of data acquisition and data analysis, in particular to a hydraulic fracturing test crack propagation monitoring system which comprises a monitoring system and is used for monitoring crack propagation behaviors in the hydraulic fracturing process in real time. Constant or dynamically changing confining pressure and axial pressure are provided; the pore pressure dynamic regulation and control unit is used for accurately controlling the injection pressure, flow and saturation of fracturing fluid and simulating fracture propagation behaviors under different seepage conditions; the multi-physics field sensing monitoring network unit is used for collecting strain, sound wave signals and a surface displacement field in the crack expansion process in real time; full-scale monitoring of rock fracture propagation is realized, an influence mechanism of pore pressure and time effect on fracture evolution is disclosed, an accurate prediction means is provided for shale gas development and deep engineering, and the fracturing effect and engineering safety are remarkably improved.

The invention relates to the technical field of hydraulic fracturing, in particular to a method for evaluating effectiveness of fracture parameters of artificial fracturing of a horizontal well. The method comprises the following steps that information collection based on ground process parameters and underground dynamic parameters is conducted on the horizontal well artificial fracturing construction process, and fracturing working condition data are obtained; according to the fracturing working condition data, the fracture expansion of the horizontal well is monitored in real time, digital conversion processing is conducted, and real-time fracture monitoring data is generated; performing micro-seismic signal analysis on the real-time crack monitoring data, and performing crack network space distribution calculation to generate crack network distribution data; performing reservoir stress field dynamic evolution analysis according to the fracture network distribution data to generate stress field distribution data; and carrying out propping agent migration trajectory tracking according to the stress field distribution data to generate propping agent distribution data. According to the method, the reservoir stress field dynamic evolution analysis and the proppant migration mechanical model are combined, and the effectiveness of the fracture parameters can be evaluated more accurately.

The invention discloses a thin mutual coal seam fracturing, gasification and carbon sequestration integrated method. The method comprises the steps of geological exploration and coal seam refined evaluation; a middle horizontal well is drilled downwards from the ground; top and bottom horizontal wells are planned and drilled in the uppermost and lower sandstone stratums of the thin mutual coal seam; a plurality of top and bottom fishbone wells are drilled obliquely downwards and upwards in the top and bottom horizontal wells; oxygen-enriched water vapor is injected into the middle horizontal well through a continuous oil pipe, the oxygen-enriched water vapor is squeezed into the reservoir under the action of high pressure, and fracturing operation is conducted; initiating an underground gasification process of the coal seam, and synchronously performing extraction operation of the coal seam gas; supercritical CO2 fracturing operation is conducted on the top horizontal well and the bottom horizontal well; injecting water-based fracturing fluid into the top horizontal well and the bottom horizontal well; gasified materials generated by coal seam combustion gasification and desorbed methane gas are extracted through the middle horizontal well, and supercritical carbon dioxide injected before is sealed for a long time. According to the method, the limitation of a traditional hydraulic fracturing technology can be solved, and the transformation effect of the reservoir can be improved.

The invention discloses a method for calculating the migration of a proppant in a horizontal well fracturing crack and the global flow conductivity of the crack, and relates to the field of unconventional oil and gas reservoir yield increase renovation, and the method comprises the following steps: (1) establishing a reservoir geologic model according to on-site logging exploration data; (2) establishing a hydraulic fracturing crack propagation fluid-solid coupling model; (3) establishing a horizontal well fracturing inter-cluster flow distribution model; (4) constructing a propping agent migration liquid-solid two-phase flow model in the hydraulic fracture; (5) solving the fluid-solid coupling model and the proppant migration model through loop iteration, and predicting the concentration distribution of the proppant in the hydraulic fracture; and (6) on the basis of the crack width and the proppant distribution result, calculating the hydraulic fracturing crack global flow conductivity. According to the method, the proppant migration model is solved by adopting a high-order discrete format, dynamic coupling simulation of hydraulic fracture propagation and proppant migration under the mine field scale is realized, the global flow conductivity of the hydraulic fracture is calculated, and reference is provided for evaluation and optimization of unconventional reservoir fracturing transformation.

The invention relates to the technical field of machine learning, in particular to a rock mass crustal stress field inversion method and system based on machine learning and a storage medium. The method comprises the following steps: S1, constructing a three-dimensional virtual model of a target rock mass, and obtaining geological data at each position in an inversion target area; s2, acquiring a geological type in the inversion area, and acquiring rock mass parameters of a rock mass corresponding to a sampling point; s3, a plurality of sets of test data are obtained through a hydraulic fracturing method and a drilling method and preprocessed, and learning data and detection data are obtained; s4, a rock mass stress prediction model is created, the rock mass stress prediction model comprises m sub-models, the learning data are used for training the sub-models, and the sub-models are verified based on the detection data. According to the invention, the problem of inaccurate inversion of the rock mass stress field is solved, and the inversion precision of the rock mass crustal stress field is improved.

A preparation method of a self-suspending proppant for hydraulic fracturing is characterized in that solid ceramsite is changed into a porous reinforced structure, a self-repairing function is introduced, bio-based macromolecules are adopted to replace a traditional surfactant, the environmental protection property is improved, nano-deposition and microwave technologies are introduced, the performance is improved, meanwhile, the energy consumption is reduced, and the compression resistance enhancement and self-repairing characteristics are newly added; and the method adapts to more complex stratum working conditions.

Described is a system for conveying wet sand. The system includes containers with a slip coating for storing wet sand. Each container includes an outlet formed in a bottom portion to facilitate removal of the wet sand from the container to a hopper. Each hopper has end walls, side walls, and an interior wall extending at an angle from the top to the bottom of the hopper to reduce an area of the outlet. A flow gate over the outlet controls discharge of the wet sand from the hopper onto a conveyor belt of a conveyor system. The hopper also includes a vibration system coupled to its exterior surface for shaking the hopper to assist in releasing sand. A discharge assembly is located at the end of the conveyor system for directing wet sand from the conveyor belt.

Some embodiments of the present disclosure relate to a method for operating a hydraulic fracturing system, the method comprising the steps of: establishing fluid communication between a pumping unit and a fracturing missile; determining if fluids are flowing between the pumping unit and the fracturing missile; if fluids are determined to be flowing, stopping the fluid communication between the pumping unit and the fracturing missile; and establishing fluid communication between the pumping unit and a bleed-off receiver. Other embodiments of the present disclosure relate to a system for performing a hydraulic fracturing operation.

The invention relates to the technical field of coal mine safety mining, and discloses a coal rock gas disaster protective layer drilling hierarchical regulation and control method which comprises the following steps: S1, geological survey; s2, drilling and pressure relief; s3, hydraulic fracturing is carried out; s4, gas extraction is carried out; s5, top plate deep hole blasting; s6, advanced cave building energy absorption flexible supporting is carried out; s7, grouting reinforcement is conducted; and S8, continuous regulation and control. According to the protection layer drilling grading regulation and control method for coal rock gas disasters, multiple functions are integrated into a single drilling hole, resource saving, cost reduction and efficiency improvement are achieved, mine environment interference is effectively reduced, meanwhile, the state of a coal rock gas system is continuously regulated and controlled, the timeliness and flexibility of disaster prevention and control are ensured, and the protection layer drilling grading regulation and control method is suitable for popularization and application. The method adapts to different geological conditions, enhances coal mine safety, embodies double benefits of green mining and economic optimization, and marks the leading-edge progress of a coal mine safety technology.

The invention belongs to the technical field of coal mining, and discloses a working face initial mining period hydraulic fracturing top cutting drill hole arrangement method based on an asymmetric three-hinged arch structure so as to solve the technical problems existing in initial mining period hard top plate treatment in the prior art. Comprising the steps that the position of a key layer is judged, the fracture distance of a hard roof of a working face is judged, the horizontal position of an upper roof fracture is determined based on an asymmetric three-hinged arch structure, the vertical height, namely the caving height h, of a hydraulic fracturing cut roof is determined, and fracturing holes of conventional straight holes are constructed in a working face open-off cut and transportation roadways and return air on the two sides. Fracturing holes in the cut holes are constructed perpendicular to the coal wall, drilling construction is conducted through drilling equipment, and the steps of conventional drilling fracturing, directional long drilling fracturing and the like are conducted respectively. According to the method, the rock mass strength is reduced, mine pressure disasters caused by overall caving of the large-area suspended roof are effectively controlled, frame pressing and rock burst disasters are avoided, the respective advantages of a conventional straight hole and a directional hole phase are fully played, and a guarantee is provided for safe and efficient stoping.

The invention provides a coal seam hydraulic fracturing parameter dynamic optimization method based on deep learning, and belongs to the technical field of coal seam parameter optimization based on computer data processing. The method comprises the following steps: firstly, acquiring a coal seam slice CT image with spatial continuity; secondly, designing a coal seam structure-physical parameter intelligent sensing model, and performing joint prediction on coal seam image semantic recognition and physical property estimation; then, performing coal seam three-dimensional structure reconstruction and regional layering modeling by utilizing a prediction output result, and performing finite element mesh division and material attribute accurate mapping on the basis to construct a coal seam three-dimensional finite element model; and finally, a coal seam hydraulic fracturing parameter multi-objective optimization problem is constructed, a coal seam physical information embedded agent model is designed, the optimization problem is dynamically solved in combination with a multi-objective evolutionary algorithm, and optimal hydraulic fracturing parameters are obtained. On the basis of deep learning, multi-source information, structural parameters and material attributes are fused, and intelligent development of coal seam hydraulic fracturing design is promoted.

The invention discloses a hydraulic fracture monitoring system and method based on an underground micro-seismic sensor network, and belongs to the field of coal mining, and the system comprises a plurality of micro-seismic sensors which are used for collecting micro-seismic signals generated by rock fracture; the plurality of data acquisition substations are used for receiving and processing the micro-seismic signals; the data transmission substation is used for converting the micro-seismic signal processed by the data acquisition substation into an optical signal; the micro-seismic server performs micro-seismic event analysis according to the optical signal; the mining network switch is connected with the data transmission substation and the micro-seismic server and is used for network data exchange; the in-mine ring main unit is connected with the mining network switch and the micro-seismic server to form a communication network of the system; in order to solve the problem that hydraulic fracture detection precision is low due to the fact that micro-seismic signals generated by hydraulic fracture and coal mining activities are difficult to accurately distinguish in a complex underground environment, the hydraulic fracture detection method and device distinguish the micro-seismic signals generated by hydraulic fracture and coal mining activities by dividing a fracture area and a mining area, and the real-time monitoring precision of hydraulic fracture expansion is improved.

The invention relates to the technical field of rock mechanics and petroleum and natural gas engineering, and particularly discloses a hydraulic fracture fracturing monitoring system, method and device based on optical fiber monitoring, and the system comprises a hydraulic fracturing simulation platform which is used for applying three-dimensional stress to a hydraulic fracturing test piece so as to simulate a stratum stress environment; the fracturing fluid injection device is used for injecting pre-prepared fracturing fluid into the test piece, so that a crack in the test piece expands; a plurality of strain sensor groups embedded in the test piece in the preparation process of the test piece; the optical fiber sensing demodulation device is used for collecting strain data detected by the plurality of strain sensor groups; and the data processing device is in communication connection with the optical fiber sensing demodulation device and is used for acquiring the strain data and processing the strain data so as to determine real-time state data of crack expansion in the test piece. According to the scheme, the fracture strain can be monitored in real time, and the accuracy and controllability of the hydraulic fracturing process are improved.

The invention belongs to the technical field of safe mining of coal mines, and relates to a hydraulic fracturing roof-cutting entry retaining method based on a crushing agent, which comprises the following steps of: calculating to obtain a target fracturing horizon height h of roof-cutting entry retaining according to a working face height M and a residual crushing coefficient KZ of a roof; calculating the crack initiation pressure P of a target fractured position of the roof-cut entry retaining according to the rock stress P * and the tensile strength R of the rock at the fractured position of the roof-cut entry retaining; drilling is conducted according to the drilling position, the drilling length L and the drilling angle alpha; the prepared BC-efficient soundless cracking agent flowable pasty slurry is injected into a drill hole through a hydraulic fracturing system and is fractured at a target fractured layer, and after the BC-efficient soundless cracking agent flowable pasty slurry is subjected to standing reaction, the drill hole is fractured for multiple times in a single-hole retreating mode. The problems that a large amount of water resources are consumed, the rock permeability is possibly increased due to high-pressure water injection, and mine water disaster hidden dangers are caused are solved.

A compartmentalized hydraulic fracturing (frac) system may include a mono line configured to carry frac fluid into a well. The system may include a plurality of zones, each zone comprising: a set of one or more frac pumps each configured to pump frac fluid into the mono line, an isolation valve configured to control the flow of frac fluid between the set of frac pumps and the mono line; and a bleed valve configured to release pressurized frac fluid from the set of frac pumps when in an open position. The system may include partition walls between the plurality of zones. The system may include a control system configured to deactivate or reactivate a zone of the plurality of zones by controlling the set of frac pumps, the isolation valve, and the bleed valve of the zone.

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.

A method for producing hydrocarbon fluids via a hydrocarbon well comprises providing petroleum coke proppant particles having an Amott index for oil of at least 0.02, an Amott index for water of at most 0.1, and a pseudo Amott index of at most 0.35. The method also comprises, for each of a number of stages of the hydrocarbon well, introducing a fracturing fluid comprising a carrier fluid and the petroleum coke proppant particles into a subterranean formation via a wellbore of the hydrocarbon well and then producing hydrocarbon fluids from the subterranean formation via the wellbore of the hydrocarbon well.

The present disclosure provides a drilling tool and a method for full-length insertion of a fracturing casing into an underground directional borehole. The drilling tool comprises a reaming bit, a torque-transmitting casing, a torque-transmitting shaft, and a pilot bit; the reaming bit is provided with a first through hole; the torque-transmitting casing and the reaming bit are coaxially arranged, and the reaming bit is connected to one end of the torque-transmitting casing; the other end of the torque-transmitting casing is provided with a first connecting portion, the inner wall of the torque-transmitting casing is provided with a keyway and a separation guide groove, and the separation guide groove is communicated with the keyway; the torque-transmitting shaft passes through the first through hole and the torque-transmitting casing; the outer wall of the torque-transmitting shaft is provided with a torque-transmitting member, one end of the torque-transmitting shaft is provided with a second connecting portion, the pilot bit is connected to the other end of the torque-transmitting shaft, and the outer diameter of the pilot bit is less than the inner diameters of the first through hole and the torque-transmitting casing. The drilling tool of the present application allows large-bore fracturing casings to be inserted into directional boreholes, reducing the cost of fracturing engineering, and facilitating high-flow and high-pressure hydraulic fracturing operations.

The invention relates to the technical field of oil exploitation, and discloses a device for simulating hydraulic fracturing to reform a shale reservoir under limited temperature and pressure, the device comprises a bottom plate, an auxiliary feeding mechanism is arranged on the bottom plate, the auxiliary feeding mechanism is used for auxiliary feeding, the bottom plate is connected with a jacking mechanism, and the jacking mechanism is used for jacking the bottom plate. The jacking mechanism is used for jacking and applying external pressure, the auxiliary feeding mechanism is connected with a vibration diffusion mechanism, and transformation modes of the shale reservoir under different pressure conditions can be accurately simulated by accurately controlling confining pressure, axial pressure and fluid pressure; the shale core sample is filled with the gold tube, so that the integrity of the sample can be kept under the condition of effectively transmitting confining pressure, and quantitative analysis of the sample after fracturing transformation is facilitated; after set gas components are injected into the sample bin pipe, water injection fracturing is carried out, and quantitative characterization of the fracturing process is achieved by monitoring the content of fluid produced after fracturing.

In a general aspect, the present disclosure relates to a blender system for use in a hydraulic fracturing system. The blender system includes a mixing tub and a movable divider associated with the mixing tub. The divider is movable between an open position and a closed position. When the divider is in the open position, liquid can flow between a first portion of the mixing tub and a second, distinct portion of the mixing tub. When the divider is in the closed position, the divider prevents liquid flow between the first and second portions. A divider control system can move the divider between the open and closed positions. A first input pump pumps fluid into the first portion of the mixing tub, and a first output pump pumps fluid from the first portion of the mixing tub. A second input pump pumps fluid into the second portion of the mixing tub, and a second output pump pumps fluid from the second portion of mixing tub.

Provided is a method for judging geology of a time-delayed extremely intense rockburst as to deep tunnel engineering. Information about geological structures is recorded according to methods such as geological mapping and advanced geological prediction of the tunnel face. Geometric characteristics of burst craters formed during the rockburst are recorded by utilizing advanced geological drilling and profile scanning technologies in a rockburst-damaged zone. 3D geostress in the rockburst-damaged zone is measured by using a stress relief method or a hydraulic fracturing method to determine the orientation of the maximum principal stress. A 3D numerical calculation model is established based on initial geostress testing results and physical and mechanical parameters of rock and structural discontinuities obtained through on-site geological investigations. By conducting excavation simulations under different combinations of structural discontinuities and performing numerical calculation, the risk of time-delayed extremely intense rockburst disasters at current locations after tunnel excavation is judged.

A method comprises hydraulically fracturing a subterranean formation by introducing a fracturing fluid comprising coke proppant particles and a carrier fluid into the formation, where the carrier fluid has a base viscosity of at most 0.8 centipoise (cP) at 25 degrees Celsius (° C.). A hydrocarbon well comprises a wellbore that extends within a formation, a production casing string that extends within the wellbore, perforation clusters formed within the production casing string, hydraulic fractures formed in the formation proximate to the perforation clusters, and a fracturing fluid comprising coke proppant particles and a carrier fluid within at least a portion of the hydraulic fractures, where the carrier fluid has a base viscosity of at most 0.8 cP at 25° C. Another method comprises providing a carrier fluid having a viscosity of at most 0.8 cP at 25° C. and forming a fracturing fluid comprising the carrier fluid and coke proppant particles.

An embodiment of a manifold of a hydraulic fracturing system includes a flow cross junction including an inlet flow bore. In addition, the manifold includes a coupling adapter including an external shoulder and a connection device. The connection device is to connect to an output of a pump of the hydraulic fracturing system, and the coupling adapter is removably inserted within the inlet flow bore such that the connection device is positioned outside of the inlet flow bore. Further, the manifold includes a retainer ring connected to the flow cross junction and compressed against the external shoulder.

The invention belongs to the field of coal mine rock burst and gas control, and relates to a high-gas coal seam mining method with cooperation of hydraulic fracturing pressure relief and high drainage roadway, which comprises the following steps: constructing a trend high drainage roadway, and constructing a hydraulic fracturing drill hole and fracturing in an air return crossheading; constructing layer-crossing drilling holes from the trend high drainage roadway to the air return crossheading; tunneling an air return crossheading and ventilating; performing hydraulic fracturing drilling and fracturing in the open-off cut; constructing a layer-penetrating hole from the end part of the trend high drainage roadway to the open-off cut; tunneling a cut hole and ventilating; the air return crossheading is connected with the air return main roadway; bedding drilling and fracturing are carried out in self-air-return crossheading construction; and hydraulic fracturing drilling and fracturing are conducted on the transportation crossheading, the transportation crossheading is tunneled and ventilated, and working face stoping is conducted. Pressure relief is carried out before roadway tunneling, a smooth air flow path can be formed before roadway tunneling and in the tunneling process to extract gas, newly generated gas on a tunnel face can be rapidly extracted, gas extraction can be continuously carried out during stoping, and safety of the whole production process is guaranteed.

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 and a device for determining fracture closure pressure based on hydraulic fracturing are provided. The method includes: determining a leak-off volume of a fluid during a refrac cycle according to a fluid pressure during the refrac cycle; generating a stiffness change curve during the refrac cycle according to the leak-off volume of the fluid and the fluid pressure; and determining the fracture closure pressure according to the stiffness change curve. A hydraulic coupling mechanism and change characteristics during a pressure attenuation process are quantitatively characterized, and characteristic response corresponding to a pressure drop curve before and after the fracture closure are accurately described, thereby providing a method and a device for determining fracture closure pressure with clear physical significance and objective effectiveness.

The invention provides a hydraulic fracturing pressure relief method for a multi-layer thick and hard top plate of an extra-thick coal seam. The method comprises the steps that the rock stratum occurrence of the multi-layer thick and hard top plate is obtained through a top plate drilling method; based on a rock mechanics experiment method and a roof peeping method, the stability of the multi-layer thick and hard roof is evaluated, and a fracturing target layer in the multi-layer thick and hard roof is judged; directional drill holes are formed in the fracturing target layer according to the rock stratum occurrence; the fractured target layer is subjected to fracture forming in the directional drilling process through abrasive jet and staged fracturing; and the crack expansion range of the fractured target layer is monitored in real time based on the in-hole micro-seismic monitoring method, and fracturing construction parameters are dynamically adjusted according to the crack expansion range. According to the hydraulic fracturing pressure relief method for the multi-layer thick and hard roof of the extra-thick coal seam, by means of rock stratum testing before fracturing, determination of fracturing construction key parameters and monitoring after fracturing, the good pressure relief effect of the multi-layer thick and hard roof is guaranteed, and effective prevention and control of strong mine pressure disasters of the multi-layer thick and hard roof are achieved.