754 results about "Horizontal wells" patented technology

The invention belongs to the technical field of petroleum and natural gas engineering, and particularly relates to a priori knowledge embedded unsupervised learning geology-engineering dessert comprehensive evaluation method, which comprises the following steps: S1, obtaining an evaluation data set of a research area, and preprocessing and standardizing the evaluation data set; s2, dividing the evaluation data set into a positive index and a negative index according to the prior knowledge, constructing positive and negative ideal points through the prior knowledge, and fusing to generate an unsupervised evaluation data set; s3, clustering is carried out on the unsupervised evaluation data set by adopting principal component analysis and an incremental online k-means algorithm; and S4, according to category labels obtained by clustering, determining geological-engineering dessert grades by adopting a standardized variable distance grading evaluation method, and carrying out segmented clustering optimization and perforation position optimization on the geological-engineering dessert grades. According to the method, a supervised evaluation effect is achieved through an unsupervised algorithm, comprehensive evaluation of the dessert of the fractured horizontal well section is achieved, and the problem of unlabeled data evaluation is effectively solved.

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

The invention discloses a method for controlling rock burst through staged fracturing of a coal mine ground horizontal well. The method comprises the steps that 1, the applicability of controlling the rock burst through staged fracturing of the ground horizontal well is judged; 2, calculating a fracturing anti-impact efficiency index, and obtaining the position of an optimal fracturing target rock stratum; 3, fracturing construction parameters are calculated theoretically; 4, pressure test experiment inspection is conducted, the fracturing construction parameters obtained in the step 3 are optimized, a pump injection pressure-displacement curve of the fractured target rock stratum is obtained, and the displacement under the minimum pump injection pressure is determined through fitting calculation; 5, a numerical model is constructed according to the coal seam and stratum structure, different fracturing parameters are set, a fracturing numerical simulation test is conducted on the target fracturing horizon, and the optimal total liquid quantity parameters corresponding to different fracturing degrees and meeting the expected rock burst prevention and control requirement are obtained; and 6, drilling well fracturing construction is conducted according to the determined fracturing construction parameters. The method is particularly suitable for pressure relief and scour prevention by adopting an L-shaped horizontal well to carry out staged fracturing on a thick and hard roof target rock stratum on the ground.

The invention discloses a displacement potential energy gradient oriented injection-production reconstruction optimization method between fracturing segments, and relates to the technical field of oil and gas field development. The method comprises the following steps: firstly, establishing an oil reservoir three-dimensional numerical model according to oil reservoir interpretation data, simulating in an oil reservoir numerical simulator by using the oil reservoir three-dimensional numerical model to obtain a global pressure field and a fluid flow velocity change condition in the oil reservoir, constructing a fluid potential field model, and determining potential energy gradients among injection-production units; constructing an objective function and setting constraint conditions by taking the most balanced potential energy gradient distribution among all injection and production units in the fluid potential field model as an optimization objective, solving the objective function based on a particle swarm algorithm, and optimizing the horizontal well multi-stage fracturing inter-section injection and production scheme to obtain the optimal horizontal well multi-stage fracturing inter-section injection and production scheme. The control device is used for controlling the injection-production process device between the multistage seam sections of the horizontal well, quantitative characterization and active control of an oil reservoir fluid potential field are achieved, and a basis is provided for improving the injected fluid sweep volume and the crude oil recovery rate of an oil reservoir.

The application discloses a metal soluble sealing assembly and a horizontal well staged fracturing process. The metal soluble sealing assembly comprises a connecting body, a releasing hand (12) arranged at the lower end of the connecting body, a necking portion and an inner cavity of the releasing hand, and the inner cavity contains a dissolving agent (13). A setting mechanism is arranged axially along the connecting body. After the setting mechanism is set in a casing (20), the thickness between the cross section of the releasing hand (12) cut from the necking portion (12-1) and the inner cavity is smaller than the wall thickness of other parts of the inner cavity. The problems that the existing bridge plug cannot simultaneously consider the pressure-bearing capacity and the dissolving rate in some special cases and the problem that the dissolving rate adjustment is limited for different working conditions are solved.

The invention discloses a horizontal well multi-cluster fracturing crack propagation prediction and parameter optimization method and device, and the method comprises the steps: inputting the target input data of a target fracturing section into a fracturing crack propagation prediction model, and outputting a crack propagation prediction result; the target input data comprises preprocessed geological parameters and engineering parameters; the fracturing crack propagation prediction model is obtained by training according to a preset training set; the preset training set is a data set obtained by performing data enhancement on the input sample data and the corrected crack expansion sample data; based on the fracturing fracture propagation prediction model, determining the contribution degree of each geological parameter and engineering parameter in the target input data to a fracture propagation prediction result, and screening key parameters influencing multi-cluster fracture equilibrium propagation; and adjusting engineering parameters in the key parameters to serve as optimization engineering parameters by taking a crack propagation prediction result meeting a multi-cluster crack balanced propagation requirement as a target. According to the method, accurate and rapid prediction of crack propagation and targeted optimization of engineering parameters can be realized.

The invention relates to the technical field of oil and gas exploitation downhole tools, in particular to a multi-stage speed reduction gas anchor capable of being horizontally separated. The problems that an existing gas anchor is low in separation efficiency under the working conditions of a horizontal well and a high gas-liquid ratio, and gas locking of a liquid discharging pump is easily caused are solved. An annular separation cavity is formed between the outer pipe body and the inner insertion pipe. The outer pipe body is provided with an exhaust hole used for exhausting separated gas and a reverse flow guide hole used for guiding in a gas-liquid mixture to be separated. At least one set of speed reduction separation device is arranged in the annular separation cavity and comprises a plurality of half cone bodies which are sequentially arranged in the fluid direction, the large circular face end of each half cone body is fixed to the inner wall of the outer pipe body, and the small circular face end of each half cone body is cut to form a first semicircular arc and a second semicircular arc which are different in axial distance so as to form an asymmetric fluid channel. Efficient gas-liquid separation is achieved through forced fluid deceleration and disturbance, dependence on gravity is avoided, pump gas locking can be effectively prevented, and the pump efficiency is improved.

The invention relates to a refracturing seam distribution method based on a comprehensive dessert prediction model, which comprises the following steps: S1, collecting well logging data, well deviation data and well bore structure parameters of a target horizontal well, and extracting geological attribute values sounding along a well bore; s2, calculating rock mechanical parameters along a shaft according to the data collected in S1; s3, calculating classification thresholds of all attributes of all wells and an average value of the classification thresholds, and determining classification thresholds of all geological and rock mechanics parameters of the block; s4, establishing a geological dessert profile, an engineering dessert profile and a comprehensive dessert profile; S5, importing the geological dessert profile, the engineering dessert profile, the comprehensive dessert profile, rock mechanical parameters, the initial fracturing perforation position of each well and the well cementation quality sound amplitude channel into visual software, and drawing a refracturing comprehensive dessert diagram; and S6, on the basis of the refracturing comprehensive dessert diagram, in combination with a refracturing process tool, optimizing a comprehensive dessert type I reservoir and a comprehensive dessert type II reservoir, and completing refracturing seam distribution position optimization design. The method solves the problem that the cloth seam position is difficult to accurately optimize and determine.

The invention discloses a digital twinning-based intelligent control system and method for butt-joint drilling of a horizontal well penetrating through a goaf coal pillar, and relates to the technical field of drilling and coal mine safety. The system comprises a data acquisition and transmission module for acquiring and transmitting multi-source heterogeneous data of a to-be-drilled goaf; the digital twinning module constructs a digital twinning model; the while-drilling perception and dynamic risk assessment module is used for acquiring and processing while-drilling measurement data and fusing the data with digital twinborn model data to generate a visual dynamic risk field; the intelligent decision and control module is used for generating a safe drilling path and a drilling parameter control instruction; the execution and well control module executes the control instruction and regulates and controls drilling equipment and a well control device; and the man-machine interaction module is used for displaying the risk information and realizing man-machine According to the method, the conversion of drilling safety from passive response to active prediction and intelligent control is realized, and the safety and the success rate of drilling operation penetrating through the goaf coal pillar are improved.

The invention discloses a tight oil and gas reservoir horizontal well volume fracturing fracture network wave and volume prediction method, which comprises the following steps of: based on geological engineering parameters of a fractured horizontal well and microseism monitoring fracture volume data, calculating weight factors of each geological and engineering parameter by establishing a multi-factor evaluation model; aiming at a to-be-predicted fracturing section, combining the solved weight factor and the geological parameters of the perforation positions of the fracturing clusters in the fracturing section, and calculating a fracturing crack-making efficiency coefficient representing the distribution uniformity of fracturing fluid; multiplying the original micro-seismic monitoring fracture volume of the fractured section by the calculated fracture forming efficiency coefficient to obtain a corrected effective fracture network wave and volume; according to the method, the fracture forming efficiency coefficient is introduced to correct the original microseismic monitoring volume, the problem that prediction results of an existing method are generally large is solved, accurate quantitative prediction of the effective fracture network waves and the volume is achieved, and a scientific basis is provided for fracturing effect evaluation and scheme optimization.

The invention relates to the technical field of petroleum and natural gas well cementation, in particular to a well cementation floating device with a turbulence function, and aims to solve the problem that cement is easy to settle at the bottom of a casing during horizontal well cementation operation by a wet shoe method. The device comprises a main body, a turbulence assembly and a valve assembly, two ends of the main body are through; the turbulence assembly and the valve assembly are arranged in the main body; the turbulence assembly is communicated with the valve assembly; the turbulence assembly comprises a turbulence pipe; the turbulent flow pipe is provided with a first port and a second port; the first port is arranged at the upper end of the turbulence pipe, and the second port is arranged at the lower end of the turbulence pipe; spiral blades are arranged in the turbulent flow pipe; the first port and the second port are communicated up and down to form a turbulent flow channel. According to the scheme, through cooperation of the turbulence assembly and the valve assembly, the flowing effect of the bottom can be enhanced, sediments such as cement at the bottom can be effectively scoured, and blockage is avoided; and meanwhile, the wet shoe channel can be replaced in the fracturing operation, and the construction efficiency is improved.

The invention discloses an ultra-short radius directional horizontal well windowing sidetrack drill and a drilling construction method thereof, and relates to the field of drilling construction. According to the ultra-short radius directional horizontal well windowing sidetrack drill and the drilling construction method thereof, a titanium alloy drill rod and a flexible drill rod are connected, a flexible universal joint is arranged between the titanium alloy drill rod and the flexible drill rod, a non-magnetic flexible drill rod is connected with the flexible drill rod, a flexible screw motor is connected with the non-magnetic flexible drill rod, and a centralizer is connected with the flexible screw motor. According to the well drilling construction method, horizontal well drilling is carried out after the bottom of a lateral window is drilled through a drill bit along a whipstock, a new operation instruction is transmitted into an MWD wireless orientator while drilling in a flexible screw motor through a drill bit track adjusting system, and the drill bit is controlled through a bent connector to change the moving track. According to the method, in the horizontal drilling process, the moving track of the drill bit can be changed according to the requirements of customers.

The invention discloses an intelligent tracer liquid production profile transient monitoring interpretation system and interpretation method, and relates to the technical field of oil and gas exploitation, the system comprises a tracer deployment module, a wellhead sampling module, a transient flow simulation module and an interpretation analysis module; according to the method, intelligent chemical tracer deployment and transient flow model analysis are combined, non-intervention type monitoring is achieved by pre-burying the oil-soluble / water-soluble inert tracer on the outer side of the horizontal well completion pipe string, and the limitation that traditional production logging needs downhole operation is broken through; a full-flow one-dimensional single-phase transient flow model covering a horizontal shaft, an inclined well section and a surface pipeline is established, pressure flow distribution is iteratively solved by adopting a discrete difference method, a tracer group flushing model and an arrival model are connected in parallel, and the liquid production speed and profile contribution of each production layer are accurately analyzed by inverting wellhead high-frequency sampling data. Real-time dynamic monitoring under complex well conditions can be achieved, production interference is avoided, and the inert tracer is resistant to high temperature and corrosion environments and wide in applicability.

The application provides a direct push storage type production logging system and method, which comprises a depth-time recording device, which obtains a real-time logging depth signal by using a sensor and a winch assembly parameter of a working machine; a downhole detection module connected with a winch of an oil well working machine and a tubing, which pushes the detection module to a measurement target layer by connecting the tubing to form a pipe column with a certain length to obtain downhole logging data; a downhole storage module which stores the downhole detection data; and a collection control module which communicates with the depth-time recording device and the downhole storage module, and which is used for realizing data collection and correction and generating a logging file corresponding to data and depth. By using the above system, even under the condition of complex well conditions such as inclined wells or horizontal wells, the target layer can be reliably and stably reached, and the overall downhole production or injection condition can be obtained, and the data is corrected based on the downhole magnetic positioning data, so that repeated data processing is avoided, and the detection efficiency and reliability are significantly improved.

The invention relates to the field of horizontal well logging of high petroleum and natural gas engineering, in particular to a horizontal well output profile imaging logging instrument. The horizontal well output profile imaging logging instrument comprises a shell and supporting structures in groups, the supporting structures are evenly arranged on the shell in the circumferential direction, a detection assembly is arranged on each supporting structure, and each detection assembly comprises a capacitance sensor and / or an electrode sensor. The same sensors on all the supporting structures are arranged in the casing pipe in an annular array coaxial with the casing pipe to form a circular imaging face, equal-diameter imaging is conducted on the circular imaging face, the logging instrument further comprises a data processing module connected with the sensors and a power module used for supplying power, and the testing accuracy is improved.

The invention discloses a tight sandstone gas reservoir horizontal well volume fracturing fracture characteristic parameter obtaining method and device and a storage medium. The method comprises the following steps that S10, the change relation of the pumping pressure, the displacement and the sand ratio along with time is obtained based on a fracturing construction curve; and S20, the effectiveness of fracturing construction is judged. And S30, geological parameters, well completion parameters and construction parameters of a fracturing implementation well are obtained, and a horizontal well fracturing geological model, a stress field model and a wellbore model are established. And S40, fracturing pump injection program parameters are input based on the fracturing construction bulletin. And S50, on the basis of the geological parameters, the well completion parameters and the construction parameters, fracturing crack characteristic parameters are solved. With the adoption of the method, the form and characteristic parameters of the fracturing crack can be obtained after the field fracturing construction is finished, so that a support is provided for evaluating the fracturing yield increasing effect.

The present application relates to a kind of determination methods of fracturing horizontal well controlled reserves, belong to oil and gas reservoir exploration and development technical field.The determination method of fracturing horizontal well controlled reserves of the present application, comprising the following steps: based on the length of horizontal section of fracturing horizontal well, the angle between horizontal section and maximum horizontal principal stress, limit drainage radius and the half fracture length of fracturing fracture, the area of the region surrounded by the maximum envelope line of fracturing horizontal well seepage field is calculated, and the control area of fracturing horizontal well is obtained;Based on the product of fracturing horizontal well control area, oil layer effective thickness and single storage coefficient, the control reserves of fracturing horizontal well is determined.The determination method of fracturing horizontal well controlled reserves of the present application simplifies single well control area into the maximum drainage area of single well that can control oil layer fluid seepage from the seepage angle, which can effectively simplify the calculation process and improve the calculation efficiency.

The utility model relates to an anti-blocking well drilling sleeve joint, and belongs to the technical field of well drilling sleeve joints. The anti-blocking drilling casing joint comprises a first pipeline, a threaded lantern ring, a first joint, a second joint and a second pipeline, one side of the first pipeline is in meshed connection with the first connector through threads, the connection strength and the sealing performance are guaranteed, the end face of the first connector is machined through a mirror face machining technology, the flatness of the attaching face of the first connector and the second connector is high, and detention of rock debris is effectively reduced, and right-handed spiral flow guide lines are formed in the inner walls of the first pipeline, the second pipeline and the connectors. The thread sleeve ring is made of a duplex stainless steel material, trapezoidal threads matched with external threads of the second connector are machined on the inner wall of the thread sleeve ring, pre-tightening force is applied through rotary meshing, the compression amount of the sealing ring is accurately increased, and the self-cleaning sealing ring is particularly suitable for a shale gas horizontal well. And the rock debris passing efficiency is greatly improved compared with that of a traditional connector.

The present application relates to a kind of telescopic printing lead device for horizontal well, relate to oil well workover technology equipment field, for solving the problem of construction difficulty caused by printing lead device matched with logging technology use, higher cost, longer construction time.Problems include: connecting barrel assembly, one end is connected with upper delivery string, the other end of connecting barrel assembly is provided with sliding cavity;Printing lead module, along the first direction telescopic setting in sliding cavity;Extrusion piece, movably arranged in sliding cavity, and located between printing lead module and the bottom of sliding cavity;Limiting structure, between connecting barrel assembly and printing lead module, for preventing printing lead module from sliding out of sliding cavity.The device in the present application is pulled out to ground, and the specific production orientation of the first lead print in the wellbore can be found by using the second lead print as reference point.In this way, the type and size of the falling object, the degree of wellbore deformation and the orientation of the wellbore can be accurately judged when lowering into horizontal section.

The application provides a method and device for establishing a fine choke system in a middle-deep shale gas horizontal well flowback stage, and the method comprises the following steps: S100, collecting original data of a research area; S200, calculating a production pressure difference corresponding to different choke sizes; S300, obtaining a stress sensitivity curve of the production pressure difference corresponding to different choke sizes; S400, obtaining artificial fracture parameters through history matching; S500, establishing a flowback model; S600, establishing a flowback numerical model; and S700, analyzing based on a numerical simulation result of the flowback numerical model. The application solves the problem that a field horizontal well flowback system lacks theoretical support and technical guidance, can reduce the influence of stress sensitivity damage, support agent backflow and embedding, and ground process erosion or blockage in the flowback process, and lays a foundation for maximizing the productivity of a shale gas well.

The invention discloses a thin reservoir horizontal well geosteering method based on real-time adjustment of a three-dimensional model, which is used for predicting lithology of sand bodies between wells and geosteering the horizontal well by normalizing gamma curves of logging and logging, and comprises the following steps of: 1, normalizing natural gamma curve data of the horizontal well while drilling obtained from logging; the strain is named as GRL; 2, normalizing a logging natural gamma curve according to the mudstone baseline value of the natural gamma curve, and naming the logging natural gamma curve as GRC; 3, performing data inspection on the GRL curve and the GRC curve of the same horizontal well, and splicing the two inspected curves of the horizontal well into GRU; according to the method, in the aspect of mismatching of the data obtained by the logging measurement method and the logging measurement method, the accuracy of the logging measurement data is improved through normalization processing; the matching of the logging data increases the transverse information of the continuous drilling sand body of the horizontal section, and greatly improves the accuracy of the inter-well sand body prediction.

The embodiment of the present application provides a method for testing horizontal well liquid production profile by using quantum dot tracer, and relates to the field of detection and analysis. The method for testing horizontal well liquid production profile by using quantum dot tracer comprises the following steps: S1, selecting different quantum dot tracers according to the composition of fracturing fluid and the number of fracturing sections of the horizontal well; S3, determining the dosage of the quantum dot tracer of each fracturing section according to the requirement of the construction site; S5, mixing the required amount of the quantum dot tracer into the fracturing fluid and pumping to the bottom layer; wherein, different quantum dot tracers are used in each fracturing section; S7, sampling at the flowback port and analyzing to determine the production condition of each section. The method can better realize the test of the horizontal well liquid production profile.

The invention provides an underground automatic ball throwing tool, a well drilling coring device and an underground automatic ball throwing method.The underground automatic ball throwing tool comprises a shell provided with an inner cavity and an underground control unit fixedly arranged on the cavity wall of the inner cavity, and the underground control unit is provided with a detection component, a control component and a driving component; the detection component is used for receiving a push-down signal or a recovery signal sent from the ground, and the control component is connected to the detection component and used for controlling the driving component to drive the ball releasing unit to execute ball releasing when the detection component detects the push-down signal or controlling the driving component to drive the ball releasing unit to recover when the detection component detects the recovery signal; the ball releasing unit is provided with a ball containing channel and a push-pull rod connected with the driving component. Based on the electric control technology, the ball throwing operation is carried out by receiving the push-down signal sent from the ground, and the automatic ball throwing device can be suitable for automatic and efficient ball throwing in the environments such as inclined shafts and horizontal wells.

The utility model relates to a development multiple complex oil layer different type horizontal well three -dimensional visual model relates to teaching mould technical field, concretely relates to a development multiple complex oil layer different type horizontal well three -dimensional visual model, including high angle analog well and arc horizontal analog well and oil layer group analog layer, its characterized in that, oil layer group analog layer setting is two, is oil layer group analog layer and lower oil layer group analog layer respectively, oil layer group analog layer and lower oil layer group analog layer overlap setting, crack analog piece is set up in oil layer group analog layer, the utility model discloses simple structure, easy to make, the display effect is obvious, solved the problem that the existing teaching mould can not directly observe high angle analog well and arc horizontal analog well in stratum threading, can directly and visually show high angle analog well and arc horizontal analog well in stratum threading trajectory and its contact situation with horizontal seam.

The present disclosure relates to a method and a flow control device for in-situ recovery ('ISR') of metals from an orebody. The method comprises drilling at least one vertical parent well into a formation comprising the orebody, and subsequently, drilling a plurality of lateral wells for performing a blasting operation to create a fractured rock silo within the formation. Next, an ISR drilling operation is carried out within the fractured rock silo by drilling further wells, including injection and production wells. Carrying out an ISR process, where casing strings comprising the flow control device is run into the injection and production wells, where the casing strings within injection wells are for injecting a fluid into each ISR well to dissolve the metal therein, and subsequently collecting a pregnant solution, comprising the dissolved metal, from the orebody via the production well and the casing strings therein.

The invention discloses a natural gas reservoir refracturing yield increasing method and application thereof, and relates to the technical field of unconventional oil and gas development yield increasing. The unconventional natural gas reservoir refracturing yield increasing method comprises the steps that a cover layer horizontal well is drilled below an original horizontal well of a reservoir; supercritical CO2 fracturing is conducted in the cover layer horizontal well to form an artificial fracture, re-fracturing is conducted on the original reservoir horizontal well to enable the fracture to extend and expand to be communicated with the artificial fracture of the cover layer horizontal well, supercritical CO2 in the cover layer horizontal well is diffused into the reservoir, and natural gas in the reservoir is displaced into the original reservoir horizontal well; and after natural gas in the original horizontal well of the reservoir is further exploited, the original horizontal well of the reservoir is closed, CO2 gas continues to be injected into the horizontal well of the cover layer, and the horizontal well of the cover layer is closed after injection operation is completed. The method is simple in operation process, low in implementation cost and remarkable in yield increasing effect, the problems that in existing unconventional natural gas reservoir fracturing, the artificial fracture coverage area is small, the fracture control range is insufficient and the like can be solved, and meanwhile effective technical support can be provided for unconventional natural gas extraction and CO2 geological sequestration.

The present application relates to a kind of drill and mill tool for drilling out oil and gas field wellbore metal blockage, especially a kind of anti-deviation grinding high-efficiency workover mill shoe suitable for horizontal well and high-deviation well.The anti-deviation grinding high-efficiency workover mill shoe mainly comprises a workover mill shoe joint, an anti-deviation grinding ball device, a workover mill shoe small cutter wing A, a honeycomb abrasive, a workover mill shoe eccentric cutter wing, a workover mill shoe small cutter wing B, a workover mill shoe base body and a workover mill shoe water eye.The workover mill shoe base body is circumferentially arranged with five rows of anti-deviation grinding ball devices on the outer side, and the front end surface of the workover mill shoe cutter wing is arranged with a single row of multi-layer honeycomb abrasives.The invention has high drilling efficiency, the bottom cutter wing is of eccentric structure, which avoids the occurrence of zero cutting speed point, the same layer of abrasives can form a complete cutting edge in a wave shape, and the tooth arrangement angle is optimized to improve the drilling efficiency.The anti-deviation grinding ball device plays a supporting role to prevent the workover mill shoe from damaging the inner wall of the casing during rotation.

The invention relates to a horizontal well fracturing casing deformation risk grading method and system, and belongs to the technical field of oil development. The method comprises the following steps: establishing a casing deformation prediction model according to three-dimensional seismic data and a logging curve; performing casing deformation risk value calculation on each section in the single well trajectory according to the casing deformation prediction model; and performing fracturing casing deformation risk grading division according to the casing deformation risk value obtained through calculation. According to the method, the casing deformation prediction model is established based on the dimensional seismic data and the logging curve, the casing deformation risk value calculated by the casing deformation prediction model is used for fracturing casing deformation risk grading division, the casing deformation risk is simulated through numerical values, the economic cost is low, and through verification of a horizontal well of a Gimachil oil and gas field of an oil and gas field in the Uyghur autonomous region of Xinjiang, the fracturing casing deformation risk is classified. The result reliability is high; the method provides guidance for follow-up fracturing casing deformation prevention and control measures, and can improve the overall development effect of oil and gas fields.

The present application relates to the technical field of impact low pressure prevention and treatment, and particularly relates to a method for preventing and treating impact ground pressure in an overlying residual coal pillar influence area, which comprises the following steps: determining a key layer of surrounding rock above a working face to be mined and a residual coal pillar in an overlying layer as a preset fracturing layer; determining a fracturing area to be fractured of the preset fracturing layer through the working face to be mined and the residual coal pillar, and the projection of the fracturing area to be fractured in a gravity direction covers the working face to be mined and the residual coal pillar; drilling a horizontal well in the preset fracturing layer after setting a vertical shaft on the ground, and then fracturing the preset fracturing layer; and adjusting the fracturing operation through a crack extension rate in the fracturing process. The method for preventing and treating impact ground pressure in the overlying residual coal pillar influence area adjusts the fracturing operation according to the crack extension rate to pre-fracture the surrounding rock above the residual coal pillar, and improves the safety of coal mining.

The invention provides a shale oil stratigraphic development degree identification chart construction method and identification method, and the method comprises the steps: carrying out the element analysis of a shale core or rock debris sample, and obtaining the geochemical parameters of a stratum; rock core observation is carried out on the shale rock core or rock debris sample, and the bedding development degree of the stratum is obtained; on the basis of the geochemical parameters and the bedding development degree, geochemical parameters which are highly related to the bedding development degree are obtained; and obtaining a bedding development degree identification chart based on the geochemical parameters having strong correlation with the bedding development degree. According to the method, the correlation between the stratigraphic element geochemical parameters and the bedding development degree is analyzed, the element geochemical parameter combination strongly related to the bedding development degree is selected, and then the bedding development degree recognition intersection chart is established and used for recognizing the bedding development degree. The method for identifying the bedding development degree while drilling is provided for the shale oil horizontal well.