61 results about "Multiple fractures" patented technology

A method and apparatus for orchestrating multiple fractures at multiple well locations in a region by flowing well treatment fluid from a centralized well treatment fluid center is disclosed that includes the steps of configuring a well treatment fluid center for fracturing multiple wells, inducing a fracture at a first well location, measuring effects of stress fields from the first fracture, determining a time delay based in part upon the measured stress effects, inducing a second fracture after the time delay at a second location based upon the measured effects, and measuring the stress effects of stress fields from the second fracture. Sensors disposed about the region are adapted to output effects of the stress fields. Location and orientation of subsequent fractures is based on the combined stress effects of the stress fields as a result of the prior fractures which provides for optimal region development.

According to one aspect of the invention, a pulse detonation tool is provided for fracturing subterranean formations. The pulse detonation tool includes a pulse detonation combustor and creates an isolated zone within a wellbore. The tool generate a series of repeating supersonic shock waves that are directed into the subterranean formation to cause propagation of multiple fractures into the formation. According to another aspect of the invention, a method and system for fracturing a subterranean formation using pulse detonation is provided.

The stimulated rock volume (SRV) of a subterranean formation may be increased by pumping viscous fracturing fluid into the formation in a first stage to create or enlarge a primary fracture, decreasing the pumping in order for the fluid to increase in viscosity within the primary fracture, and then continuing to pump viscous fluid into the formation in a second stage. The fluid pumped into the second stage is diverted away from the primary fracture and a secondary fracture is created. The directional orientation of the secondary fracture is distinct from the directional orientation of the primary fracture. The fluid of the first stage may contain a viscosifying polymer or viscoelastic surfactant or may be slickwater.

A method and apparatus for initiating and propagating a vertical hydraulic fracture in unconsolidated and weakly cemented sediments from a single bore hole to control the fracture initiation plane and propagation of the hydraulic fracture, enabling greater yield and recovery of petroleum fluids from the formation. An injection casing with multiple fracture initiation sections is inserted and grouted into a bore hole. A fracture fluid carrying a proppant is injected into the injection casing and opens the fracture initiation sections to dilate the formation in a direction orthogonal to the required fracture azimuth plane. Propagation of the fracture is controlled by limiting the fracture fluid injection rate during fracture initiation and propagation and maintaining a minimum fracture fluid viscosity. The injection casing initiation section remains open after fracturing providing direct hydraulic connection between the production well bore, the permeable proppant filled fracture and the formation.

The invention provides a method for carrying out fracture CT (Computed Tomography) scanning and monitoring on initiation and extension of a large-size volcanic hydraulic fracture, which belongs to the field of volcanic gas reservoir and fracturing during oil and gas field development. The method is characterized in that CT scanning is respectively carried out on a rock sample of a volcanic before and after a hydraulic fracture physical modeling fracture test, and the monitoring on the large-size volcanic hydraulic fracture and intuitive analysis on a fracture initiation and extension rule of the hydraulic fracture can be realized through comparing changes of the rock sample before and after the test. According to the method provided by the invention, a fracture initiation and extension process of each scanning cross-section fracture can be clearly and intuitively reflected under the situations of different primary stress differences before and after fracturing, rock pore, development degree of a natural fracture and discharge capacity and viscosity of a fracturing liquid, and an important role is played in researching a fracturing fracture initiation and extension mechanism which adapt to characteristics of multiple fractures and fractured-vuggy reservoir of the volcanic.

The invention proposes a quick high-voltage switch. The switch comprises N vacuum arc-extinguishing chambers, N electromagnetic repulsion operation mechanisms and one energy storage and trigger unit, wherein the N vacuum arc-extinguishing chambers are connected in series; each vacuum arc-extinguishing chamber is connected with one electromagnetic repulsion operation mechanism; and the N electromagnetic repulsion operation mechanisms are controlled to be switched on or off by the energy storage and trigger unit. According to the quick high-voltage switch, multiple fractures are connected in series, so that the opening travel of the insulated fractures is increased and a higher voltage can be withstood; and only one energy storage and trigger unit is used for control, so that the switch-on and switch-off synchronicity is high and the integral switch-on and switch-off time is unchanged.

The invention discloses a refracturing method by naturally selecting dessert temporary blocking size for a horizontal well. The refracturing method comprises the steps that a well with certain geologic reserves is selected, and geological dessert areas of the whole horizontal well which needs to be subjected to refracturing are ruled again; a new rock mechanics crack initiation order is predicted;the dessert area with rich accumulation of oil and gas and with the best physical property is found, and a first fracture is pressed to be open; the first fracture is blocked through a temporary blocking agent, fracturing liquid is pumped into continuously, the pressure rises, the dessert area of the secondary grade is selected, and a second fracture is pressed to be open; multiple fractures of athird fracture, a fourth fracture and the like are sequentially pressed to be open, and fracturing of the multiple fractures with naturally selected desserts in a segment is realized; and meanwhile,the powder-like high-strength water-soluble temporary block agents are put into the fractures so as to form temporary blocking on the end of the main fracture, the net pressure in the fracture is increased, the micro-fracture which cannot crack originally is pressed to be open, or the new branch fracture is formed, and a larger transformation size is obtained. According to the refracturing method,the defect that a sleeve is deformed, and consequently, a downhole tool cannot be tripped into is effectively overcome, and recovering and increasing of the productivity of the horizontal well are facilitated.

The invention provides a method and system for optimizing spacing of shale fracture network perforation clusters. The method and system analyze and solve changes of induced stress during full three-dimensional expansion of multiple fractures in the case of multiple perforation clusters by employing finite element numerical simulation, local maximum and minium horizontal main stress difference around fractures is eliminated by using inter-fracture stress interference, local horizontal main stress of a stratum is approximately isotropic, a local optimum stress field is formed, main facture diverting and natural fracture opening are promoted, and a network of fractures is thus formed.

A method and apparatus for initiating and propagating a vertical hydraulic fracture in unconsolidated and weakly cemented sediments from a single bore hole to control the fracture initiation plane and propagation of the hydraulic fracture, enabling greater yield and recovery of petroleum fluids from the formation. An injection casing with multiple fracture initiation sections is inserted and grouted into a bore hole. A fracture fluid carrying a proppant is injected into the injection casing and opens the fracture initiation sections to dilate the formation in a direction orthogonal to the required fracture azimuth plane. Propagation of the fracture is controlled by supplying fracture fluid independent to the two opposing wings of the hydraulic fracture. The injection casing initiation section remains open after fracturing providing direct hydraulic connection between the production well bore, the permeable proppant filled fracture and the formation.

Disclosed is a frame-type pressurizing multipurpose guider. The frame-type pressurizing multipurpose guider is characterized by being composed of a main frame (1) and a guide barrel (2), a positioner (3) is arranged at one end of the main frame, triangular three toes (4) are arranged at the tail end of the positioner, a nut (5) is arranged at the other end of the main frame, an external thread (6) of the guide barrel is matched with the nut, a guide hole (7) is arranged in the guide barrel, and an inner hexagon groove (9) is arranged at the tail of the guide barrel. The frame-type pressurizing multipurpose guider has the advantages that according to knowledge of human anatomy, fractures of irregular bones of a human body are multiple fractures, especially fractures of scaphoid, calcaneus, astragali and the like; when fixing in the guide barrel is needed, a guide needle can be accurately implanted at one step, so that artificial osteoporosis caused by repeated implanting of the guide needle can be avoided to realize stable fixing of a screw. The frame-type pressurizing multipurpose guider is convenient for fracture pressurizing, pressurizing can be conveniently performed by the guider when the scaphoid fractures, separates, shifts, closes and restores for the convenience of early healing of fracture, and the frame-type pressurizing multipurpose guide is suitable for implanting of the guide needle of the guide barrel for various fractures of the irregular bones of the human body.

The invention provides an abrasive jet injection multiple fracturing device. The device comprises multiple stages of spray guns which are connected in series, wherein each spray gun is a hollow cylinder, and at least two nozzles are formed on the side wall of each spray gun; the spray guns comprise a primary bottom spray gun which is arranged on the lower part of the abrasive jet injection device and multiple stages of upper spray guns which are positioned on the upper part of the bottom spray gun; a slide bushing capable of sealing the nozzle of the spray gun in the stage is arranged in each upper spray gun; an accommodating hole for accommodating the nozzle is formed on the side wall of each spray gun; a nozzle cap is sleeved outside the nozzle, and an inner hole of the nozzle cap is matched with the outer wall of the nozzle; the nozzle cap is in threaded connection with the accommodating hole, so that the nozzle is fixed on the side wall of each spray gun; and a splash-proof block is arranged on the outer wall of each spray gun close to the nozzles. The abrasive jet injection multiple fracturing device can effectively prevent splash-return jet from eroding and destroying a spray gun body, prolongs the service life of the spray guns, and simultaneously, reduces the manufacturing cost of the spray guns.

The invention provides a fracture-cavity carbonate reservoir uncertainty modeling method and a device thereof. The method comprises steps: a modeling method of cause control is adopted, at least one uncertain geological parameter is selected to carry out uncertainty modeling on first discrete distribution models for different types of reservoirs, and second discrete distribution models are acquired; the second discrete distribution models are integrated to form a third discrete distribution model, wherein the third discrete distribution model contains multiple fracture-cavity reservoir three-dimensional discrete distribution models; and the fracture-cavity reservoir three-dimensional discrete distribution models in the third discrete distribution model are screened to acquire a fourth discrete distribution model with at least one fracture-cavity reservoir three-dimensional discrete distribution model kept. The scheme takes into account the differences of reservoir scales, the influences of uncertainty and the constraints of geological laws and causes on the modeling process, and also avoids the problems of inconsistent understanding of production dynamics and connectivity and inaccurate reserves when only one model is built in the past.

The present invention discloses an offshore fractured horizontal well post-fracture effectiveness evaluation method. The method comprises establishing a matrix linear flow equation; calculating an initial fracture half-fracture length and an initial fracture gap according to the established matrix linear flow equation; establishing a numerical model based on the calculated initial fracture half-fracture length and the initial fracture gap; and fitting a daily gas production and a cumulative gas production through numerical simulation based on the established numerical model, and adjusting the initial fracture half-fracture length and the initial fracture gap according to the fitting result, so as to realize complete fitting. Through the above technical scheme, an evaluation method which combines a horizontal well multiple fracture analytic model and a horizontal well multiple fracture numerical simulation is provided, and multiplicity of the numerical model can be avoided while the accuracy of an analytic solution can be raised.

A multi stage liner with cluster valves for completing and performing multiple fracture stimulations along a length of wellbore. Groups of cluster valves, with isolation between such groups of cluster valves, and a method of using same, are provided to achieve increased oil and gas flow to a wellbore in openhole or cased hole applications for oil and gas wells.

A controlled rate of propagation of the fluid saturation front or thermal front is desired in may oil and gas and geothermal operations. Natural fractures and fractures created during hydraulic stimulation may have heterogeneous hydraulic properties resulting in uneven flow distributions, therefore leading to short-circuiting and breakthrough issues. The present invention relates to wellbores connected hydraulically by multiple fracture zones; methods are directed to control for even flow distribution among fractures, regardless of heterogeneities in fracture hydraulic properties, and to control propagation of saturation fronts and thermal fronts in subsurface reservoirs.

A cyclic steam soak (CSS) stimulation method for producing heated hydrocarbons from a viscous hydrocarbon-containing formation comprises the steps of: a) drilling a well (1) having a substantially horizontal or inclined lower section (3) into the viscous hydrocarbon-containing formation (4) substantially along the trajectory of the minimum compressive horizontal stress Sh; b) cutting at selected intervals along the length of the lower well section (3) substantially disk-shaped cavities (5A-5D) into the viscous hydrocarbon-containing formation (4) by a rotating hydraulic jet cutting device (6); c) completing the well (1); d) injecting steam into the well (1) and disk-shaped cavities (5A-5D) at such an elevated pressure that the hydraulic pressure in at least one disk-shaped cavity 5A is above the formation fracturing pressure, thereby fracturing the formation (4) and permitting the steam to invade the formation surrounding the fracture and to heat hydrocarbons in the steam invaded zone; e) interrupting steam injection and producing heated hydrocarbons via the well (1); and f) repeating steps (d) and (e) a number of times.

The invention provides an appearance defect detection method and device. The method comprises: after a to-be-detected image is acquired, to-be-merged defect regions can be picked out from multiple defect regions according to morphological characteristics of each defect region, then the to-be-merged defect regions are merged according to association relationship between any two adjacent to-be-merged defect regions, and then defect types of the merged defect regions and unmerged defect regions are respectively determined. Therefore, by selectively merging the defect regions, multiple fractured parts originally belonging to the same defect type can be reintegrated, multiple scattered points densely distributed also can be merged into a whole, the problem that an existing product appearance detection technology can not judge whether to merge multiple defects for obtaining a complete appearance defect is effectively solved, defect forms required by the defect regions are restored on the whole, false detection probability is reduced, and appearance defect detection accuracy is improved.

The invention discloses a tobacco stem extracting method based on a local symmetric relation. The method mainly includes the steps that 1, a symmetry characteristic graph and a stroke width characteristic graph are obtained through a transform method based on local symmetry, then the symmetry characteristic graph, the stroke width characteristic graph and an original graph are combined into a five-channel characteristic space, and then a region growing algorithm is used in the characteristic space to obtain tobacco stem communicating regions; 2, a hierarchical clustering method is used for connecting multiple fractured communicating regions belonging to one tobacco stem, and a communicating region filtering method based on a threshold value is used for obtaining the last main tobacco stems; after the tobacco stems are extracted, tobacco leaves are sorted by using the positions of the tobacco stems, or stems of the tobacco leaves are rejected to ensure cigarette quality.

The invention discloses a method and a device for calculating fracture conductivity value of a horizontal well to be fractured. The method comprises the following steps: for each fractured horizontalwell, calculating the fracture half length according to the first actual production data of each fracturing point; according to the fracturing potential value of each fracturing point, the candidate models of multiple fracture conductivity values are established respectively, the simulated yield data being generated by the numerical simulator respectively; selecting a candidate model whose fittingvalue between the simulated yield data and the second actual yield data is smaller than a preset fitting threshold as the selected model; according to the selected model, the fracture conductivity ofeach fracturing point is calculated. Based on the fracture conductivity and fracture potential values of fractured horizontal wells, the fracture conductivity values of the data points of the horizontal wells to be fractured are calculated. The fracture conductivity calculated by this scheme has a high accuracy in predicting the production rate, which provides an effective data basis for fracturing design of horizontal wells to be fractured and can better guide the development.

The invention discloses a process for the communicated multi-bed exploitation of deep thin-bed natural alkali, salt and saltpeter cross wells which are buried more deeply and have thinner ore beds. The process is characterized in that the well distance is enlarged to be about between 400 and 500 meters by using the stratum cracks and vertical cracks at a depth of more than 1,200 meters underground, the characteristics that the vertical cracks extend in different directions, but the main crack direction extends longer, and techniques for detecting trend, ground stress and crack direction of the ore beds, and the wells can be communicated within a proper time period so as to prolong the service life of brine wells and improve the economy of the brine exploitation. Meanwhile, natural alkali beds on both sides of each crack can effectively contact with and be dissolved in injecting miscellaneous water by making use of the characteristics that the water solubility of dunn bass and top bottom plates of the alkali ore beds is much smaller than that of the alkali bed, and the ore beds and the top bottom plates can be cracked by multiple fractures so as to furthest make use of natural alkali resources. The deep-thin bed natural alkali, salt and saltpeter which are buried more deeply and have thinner ore beds can be explored by using the process, and favorable economic benefit and social benefit can be obtained.

The invention provides a krischner wire with a sliding sleeve, is used for multiple-fracture treatment, and belongs to orthopedics instruments. The sliding sleeve (2) is sleeved in a wire body section of the krischner wire (1), the wire body section of the krischner wire is provided with one or two bosses (3), the sliding sleeve can freely rotate along a vertical axis in the wire body and is limited by the bosses to be not capable of moving up and down obviously along the vertical axis of the wire body, a hole (4) is arranged on or an ear-shaped handle (10) with holes is protruded a side of the sliding sleeve , tension band materials (7) are facilitated to attach to the sliding sleeve. An annular pre-breaking incisura (6) is arranged at a junction between a wire tail end of the krischner wire and the bosses (3) on wire tail side to facilitate to break the wire tail end. The krischner wire and the tension band materials are integrated linked through the sliding sleeve to limit the krischner wire to move in bones, so that the operation is facilitated, and fixing is reliable; and the krischner wire, the sliding sleeve and the tension band materials can be made of metal or high molecular materials, and can be sterilized in an integral package.

The invention provides a cross fixator for head, neck and limbs fractures. The fixator comprises a cross clapboard, wherein the cross clapboard is formed by connection of a vertical clapboard and a horizontal clapboard through a sheet axis 2; a cervico-occipital top cap is connected to the upper end of the vertical clapboard, a chest saddle spinal fixing band is connected with the lower end of the horizontal clapboard in the middle of the vertical clapboard; the other end of the chest saddle spinal fixing band is connected with a chest saddle; the upper end of the chest saddle is provided with a mandible fixed holder; a supporting column of the mandible fixed holder is arranged between the mandible fixed holder and the chest saddle; and two ends of the horizontal clapboard are connected with a shoulder lock fixing band respectively, and the other end of each shoulder lock fixing band is connected with the chest saddle. The cross fixator has the advantages of simple structure, convenience in operation, strong function compatibility, strong emergency response and convenience in portability, and is particularly suitable for front-line field rescuing of disasters, so that a wounded person with head and neck wounds can be steadily transferred to a fixed stretcher with all speed, and batch rescue and hemostasis to multiple trauma and multiple fracture can be implemented with all speed.

The invention relates to an oil extraction method for injecting water among well fissures of multistage fractured horizontal well at intervals. The oil extraction method sequentially comprises the following steps: carrying out staged fracturing on a shaft of a horizontal well, so as to form multiple fractured fissures vertical to the shaft of the horizontal well; arranging a one-way valve at each odd-level fissure, respectively, and arranging an injection allocation valve at each even-level fissure, respectively; carrying out exploiting for a period of time by virtue of natural energy at the initial production stage until the bottom hole pressure drops to a bubble point pressure; automatically switching off the one-way valves and automatically switching on the injection allocation valves by virtue of interval fissure water injection exploiting, and simultaneously injecting water into an oil sleeve annular space formed between an oil pipe and a sleeve for displacement; and after injected water flows into the even-level fissures for a period of time, stopping the injection of water, automatically switching off the injection allocation valves, and simultaneously automatically switching on the one-way valves, so that crude oil is produced through the odd-level fissures and enters the oil pipe. The method has the beneficial effects that the process is simple, the operation is convenient, the cost can be lowered, the uniform displacement can be realized, the yield is increased, and the practical application value is relatively high.

The invention discloses a qi-benefiting and bone-growing Chinese medicinal preparation, which is a medicament prepared from the following raw materials in parts by weight: 10-60 parts of astragalus, 3-30 parts of dangshen, 2-15 parts of Chinese angelica, 1-15 parts of peach kernel, 1-15 parts of safflower, 3-18 parts of fortune's drynaria rhizome, 5-18 parts of himalayan teasel root, 2-12 parts of red paeony root and 3-12 parts of szechuan lovage rhizome. A preparation method of the preparation comprises the following steps of: adding astragalus, dangshen, Chinese angelica, peach kernel, safflower, fortune's drynaria rhizome, himalayan teasel root, red paeony root and szechuan lovage rhizome serving as raw materials into 6-12 times of water; performing reflux extraction for 2-4 times, every time for 1-2 hours; combining filtrates; concentrating into an extract of which the density is 1.10-1.30; preparing into particles taking white sugar and corn starch as auxiliary materials with a spray drying process; bagging; and packaging. The preparation can be used for organizing haematoma at the initial stage of bone fracture, filling tissue defects, fixing fractured ends, enhancing the reactivity of injured bones to stress at the medium and later stages of fracture, and stimulating bone-growing activity. The Chinese medicinal preparation can be used for quickly improving the body conditions of patients suffering from traumatic fracture, in particular patients suffering from severe fracture trauma and multiple fracture and aged weak and fractured patients, improving appetite, relieving pain, relieving swelling, making patients suffering from fractures recover early, and accelerating healing.

The invention belongs to an instrument of the department of orthopaedics, and provides a kirschner wire provided with a ring, which can be used for multiple fracture treatment. A wire body section of the kirschner wire (1) is sleeved with the ring (2) which can freely rotate along a longitudinal axis of a wire body; two bosses (3 and 4) or a groove are / is formed in the wire body section for limiting vertical movement of the ring (2); and the ring (2) can adopt a round shape, a flat round shape, a laced shape, an irregular ring shape or a distortion shape; the boss on the point side of the kirschner wire can adopt a section of thread (4); the boss on the tail side of the kirschner wire can adopt a section of polygon body (3); a ring-shaped preliminary broken incisure (5) is arranged in the junction position of the tail section of the kirschner wire and the boss (3) on the tail side of the kirschner wire; and the kirschner wire, the ring and a tension band material can adopt metal or polymer materials, and overall package and disinfection are performed for standby application. The kirschner wire and the tension band material are connected into a whole through the ring, so that the sliding of kirschner wire in a bone is limited, the structure is simple, the surgical operation is convenient, and the fixation is reliable.

The invention discloses a lower limb multiple fracture fixing support for pre-hospital first aid. The lower limb multiple fracture fixing support comprises a waist fixing plate connected with a hip joint turnplate through a connection strip, the hip joint turnplate is connected with a clamping strip which is connected with a clamping buckle, the clamping buckle is mounted on a thigh fixing plate,a second connection seat is arranged on the thigh fixing plate and connected with a second extensible supporting rod which is connected with a knee joint turnplate, the knee joint turnplate is connected with a first extensible supporting rod which is connected with a first connection seat, the first connection seat is arranged on a shank and foot fixing plate, a plurality of hook & loops are arranged on each of the waist fixing plate, the thigh fixing plate and the shank and foot fixing plate, the knee joint turnplate is provided with a laser tube, the hip joint turnplate is provided with a hip joint light receiving head, and an ankle portion of the shank and foot fixing plate is provided with an ankle joint light receiving head. Laser is adopted to locate hip, knee and ankle joints; quick-assembly design is adopted, so that quick, accurate and efficient pre-hospital first aid is ensured.

The invention discloses a multi-directional traction frame for closed reduction of tibial fracture. The multi-directional traction frame comprises a bottom plate having a bearing effect, wherein the bottom plate is fixed to an outside device through four-corner mounting holes; sliding chutes are formed in two ends in the bottom plate, and a sliding block is in sliding connection to the inner partof each sliding chute; a first supporting plate and a second supporting plate are rotatably connected to the upper sides of the two sliding blocks, and the upper side of the first supporting plate andthe upper side of the second supporting plate are rotatably connected through a hinge; a plurality of clamping chutes are formed in a fixed rod; a movable block is in movable and clamped connection to the inner part of each clamping chute; and a first connecting rod, a second connecting rod and a holding plate are sequentially and rotatably connected to each movable block, a rotating button is rotatably connected to the inner part of each holding plate, and a clamping rod is in meshed connection to the center of each rotating button. According to the multi-directional traction frame disclosedby the invention, through discretionary rotation of the first connecting rod and the second connecting rod, and through rotating second screw rods, the multi-directional traction frame can be fixed at discretionary position, and besides, the angle of the holding plates can be in universal regulation, so that the clamping rods can be moved leftwards, rightwards, forwards and backwards, and furthereffective traction for multiple fracture sites can be achieved.

The invention discloses a culturing technology for upright-ladybell-root in-vitro regeneration tissue. Upright ladybell roots are campanulaceae plants, and medicinal materials of the upright ladybellroots are dried roots of adenophora tetraphylla or adenophora hunanensis. Digging is carried out in spring and autumn, stem leaves and fibrous roots are removed, soil is cleaned, cork is scraped, anddrying in the sun is carried out. The upright ladybell roots are long conical or long cylindrical, some roots are slightly curved or warped, and a plurality of half-moon-shaped stem marks exist on theperiphery, and are in disc section shapes; surfaces are yellowish white or light brownish yellow, residual brown cork frequently exists at sunken portions, a plurality of deep-sunken transverse striations are arranged at the upper portions and are intermittent annular striations, and longitudinal wrinkles and longitudinal furrows are arranged at the lower portions. The weight is light and porous,bending easily occurs, and fracture surfaces are yellowish white and uneven, and have multiple fractures. The smell is feeble, and the flavor is sweet and light; the roots which are rough and long instrip, dry, rich, yellowish white in color and completely-clean in scarfskin are good. According to the culturing technology, the upright ladybell roots with bud stem sections serve as explants, upright-ladybell-root in-vitro regeneration is achieved through processes such as bud induction, bud enrichment culturing, rooting culturing, seedling hardening and transplanting, and a technical supportis provided for mass breeding, rapid propagation and new-species popularization.

The invention belongs to the technical field of coal seam macroscopic fracture prediction, and particularly relates to a coal seam macroscopic fracture dominant development orientation prediction method, which comprises the steps of 1, selecting a coal wall picture, processing an original coal wall image by adopting different gray thresholds, taking white as an area with a gray value smaller thanq, and taking black as other parts; 2, carrying out information input and output, including single fracture picture input, multiple fracture picture input and fracture information output; 3, preprocessing the image, wherein as the underground shooting condition is limited, crack pictures often have poor definition and are reasonable in structure, and noise reduction processing, binarization optimization, image edge detection and the like can be automatically carried out on the preprocessed pictures, so that the digital pictures reach the actual application standard, the tedious workload of workers can be greatly reduced, and the efficiency and accuracy of field recognition are improved.