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166 results about "Geosteering" patented technology
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Geosteering is the optimal placement of a wellbore based on the results of realtime downhole geological and geophysical logging measurements rather than three-dimensional targets in space. The objective is usually to keep a directional wellbore within a hydrocarbon pay zone defined in terms of its resistivity, density or even biostratigraphy. In mature areas, geosteering may be used to keep a wellbore in a particular section of a reservoir to minimize gas or water breakthrough and maximize economic production from the well. In the process of drilling a borehole, geosteering is the act of adjusting the borehole position (inclination and azimuth angles) on the fly to reach one or more geological targets. These changes are based on geological information gathered while drilling. Originally only a projected target would be aimed for with crude directional tools. Now the advent of rotary steerable tools and an ever-increasing arsenal of geophysical tools enables well placement with ever-increasing accuracy. Typically a basic tool configuration will have directional and inclination sensors, along with a gamma ray tool. Other options are neutron density, look ahead seismic, downhole pressure readings et al. Due to the vast volume of data generated, especially by imaging tools, the data transmitted to surface is a carefully selected fraction of what is available. Data is collected in memory for a data dump when back on surface with the tool.
Multi-sensor dynamic calibration method in rotary geosteering drilling
The invention provides a multi-sensor dynamic calibration method in rotary geosteering drilling, and relates to the technical field of petroleum engineering and drilling, and the method comprises the following steps: collecting original sensing data in real time through a multi-source sensor array deployed on a rotary geosteering drilling tool, wavelet packet decomposition is combined with an improved sliding window algorithm to carry out online denoising processing on original data, and a three-dimensional feature matrix containing environmental interference factors is established; and based on the three-dimensional feature matrix, constructing a dynamic calibration model based on depth time sequence association, respectively processing sensor body feature flow and environment interference feature flow by using a dual-channel LSTM network, performing dynamic weight distribution and fusion on dual-channel features by means of a gating attention mechanism, and outputting a dynamic deviation compensation coefficient of each sensor. The parameter set is generated and reconstructed through the three-dimensional feature matrix, the two-channel network and cooperative calibration, the drilling efficiency and precision are improved, errors are reduced, and intelligent development is promoted.
Owner:HEILONGJIANG GETAI TECH DEV CO LTD
Well-seismic integrated horizontal well geosteering risk evaluation method
The invention relates to the technical field of unconventional oil-gas exploration, and discloses a well-seismic integrated horizontal well geosteering risk evaluation method, which comprises the following steps: S1, acquiring three-dimensional seismic data, measurement while drilling data and geological logging data through a well-seismic integrated data acquisition platform; s2, constructing a horizontal well geosteering dynamic model based on multi-source heterogeneous data, and integrating a seismic inversion result and real-time drilling parameters; by establishing a well-seismic data dynamic fusion mechanism and a multi-source risk quantification model, the problem of space-time dislocation of seismic inversion and measurement-while-drilling data is solved, the recognition precision of a fault boundary, a lithologic interface and a pressure abnormal zone is ensured to be matched with drilling position changes in real time, risk misjudgment caused by model updating lag in a traditional method is eliminated, and the accuracy of the method is improved. The accuracy and timeliness of geosteering decision making of the complex structure area are improved; by monitoring well track deviation and geological model prediction deviation in real time, the risks of well wall instability and target deviation are avoided, and the operation safety of the horizontal well in the full life cycle is guaranteed.
Owner:ZHANJIANG RUIFAN PETROLEUM TECHNOLOGY CO LTD
Dielectric-based geosteering
A method can include receiving dielectric data from a downhole dielectric tool of a drillstring disposed in a borehole in a target material that includes a target material boundary between the target material and one or more other materials; generating a geosteering command, based at least in part on the dielectric data, that calls for orienting a drill bit of the drillstring with respect to the target material boundary; and issuing the geosteering command to a geosteering actuator of the drillstring.
Owner:SCHLUMBERGER TECH CORP
Grouting reinforcement method for directional drilling of goaf
The invention provides a goaf directional drilling grouting reinforcement method which comprises the following steps: S1, determining a goaf treatment engineering grade and a design standard, and delimiting a goaf treatment range according to the engineering grade and the design standard; the method comprises the steps of S1, determining the position, coordinates and spatial arrangement of a drilling target spot, S2, determining the position, coordinates and planar arrangement of a directional well site, wellhead coordinates and planar arrangement of a directional well site, S4, designing a drilling track form and a drilling well bore structure, and S5, designing a drilling track form and a drilling well bore structure, the drilling track form comprising at least one of a straight line-curve form, a straight line-curve-straight line form and a straight line-curve-curve form. And S5, the drilling technology and drilling track control are determined, and drilling and drilling track control are conducted through directional drilling track measurement control equipment, near-bit geosteering equipment and rotary steering drilling equipment. The goaf directional drilling grouting reinforcement method is wide in treatment range, low in treatment cost and low in construction risk.
Owner:CHINA COAL SCI & ENG ECOLOGICAL ENVIRONMENT TECH CO LTD
Resistivity inversion interpretation by ai assistant during geosteering job
Some implementations include a system configured for real-time well path optimization of a wellbore being drilled into a subsurface formation, the system comprising: a downhole tool including a resistivity sensor; a drilling assembly coupled to a drill bit, the drilling assembly including the downhole tool; and a learning machine configured to, compare an input image of a resistivity inversion against an archive of historical data; generate, based on the comparison, a real-time well path suggestion; and output the real-time well path suggestion to a user interface.
Owner:HALLIBURTON ENERGY SERVICES INC
Geosteering control framework
A method can include rendering a graphical user interface to a display; receiving data; responsive to determining boundary locations for formations in the subsurface environment using the data, automatically rendering the boundary locations in the graphical user interface; responsive to determining extended boundary locations in the subsurface environment for a region beyond an end of the borehole using the boundary locations, automatically rendering the extended boundary locations in the graphical user interface; responsive to determining a target location in the region using the extended boundary locations, automatically rendering the target location in the graphical user interface; and, responsive to generation of a trajectory from an end of the borehole location to the target location, automatically rendering the trajectory in the graphical user interface.
Owner:SCHLUMBERGER TECH CORP
Geosteering control framework
A method can include acquiring resistivity measurements using a downhole tool of a drillstring disposed in a borehole in a subsurface environment; performing a resistivity measurement-based inversion to generate a structural representation of a portion of the subsurface environment that includes an end of the borehole; generating a control instruction using an artificial intelligence framework and the structural representation, where the control instruction is for lengthening the borehole along a current borehole trajectory or a different borehole trajectory; and controlling the drillstring to lengthen the borehole based on the control instruction.
Owner:SCHLUMBERGER TECH CORP
Underground geosteering closed-loop control system and control method
PendingCN119102578Areduce interventionHigh control precisionSurveyDirectional drillingGeosteeringLoop control
The invention provides an underground geosteering closed-loop control system and method.The underground geosteering closed-loop control system and method can complete real-time design track correction and borehole track and control instruction generation underground so as to improve the accuracy and response speed of a control instruction, and the system comprises an information collection unit arranged underground and including a dynamic attitude measurement sensor LWD short section; the central control unit is in communication connection with the information acquisition unit; a real drilling track calculation module, a design track correction module, a self-closed loop control program module and an artificial intelligence prediction module are arranged in the central control unit; a track correction module is designed to obtain geological parameter data of the LWD short section, and the deviation value delta 0 between the geological parameter data and the geological requirement is calculated; when the geology deviation value delta0 is larger than a threshold value epsilon0, a second design trajectory is regenerated according to the geosteering trajectory adjustment principle; and the artificial intelligence prediction module inputs the first to-be-drilled track or the second to-be-drilled track into the control instruction artificial intelligence prediction model, and outputs a new rotary steering tool control instruction.
Owner:四川天石和创科技有限公司
Well-ground geosteering closed-loop control method and system
According to the well-ground geosteering closed-loop control method and system, the design track can be adaptively adjusted according to geological information of real-time drilling, and drilling safety is guaranteed; an artificial intelligence prediction technology is applied to well track and instruction prediction, the accuracy and response speed of a control instruction are improved, and the control method comprises the steps that underground continuous attitude measurement data and LWD measurement parameter data are obtained; continuously comparing geological deviation values between the LWD measurement parameter data and geological requirements along the actual drilling track; when the geology deviation value is larger than a threshold value epsilon 0, a second design track is obtained through automatic design; when the geology deviation value is smaller than or equal to a threshold value epsilon 0, the continuous actual drilling track is compared with the first / second design track, and geometric deviation is calculated; when the geometric deviation is larger than a threshold value epsilon 1, a second to-be-drilled track is recalculated according to the first / second design track; and inputting the to-be-drilled track and the drilling operation parameters corresponding to the to-be-drilled track into the control instruction prediction model to obtain a new control instruction.
Owner:四川天石和创科技有限公司
Target trajectory for geosteering drilling of a wellbore
A method comprises retrieving geoscience data of a subsurface formation into which a wellbore is being drilled and retrieving drilling operation data for drilling the wellbore. The method includes determining at least one of an optimized target trajectory of a path of the wellbore to be drilled or a series of control operations for the drilling in order to follow the path of the wellbore to be drilled, independent of using waypoints as input and based the geoscience data and the drilling operation data. The method includes modifying geosteering of the drilling of the wellbore based on the at least one of the optimized target trajectory or the series of the control operations.
Owner:HALLIBURTON ENERGY SERVICES INC
High-precision while-drilling natural gamma-ray spectrum imager
PendingCN119333106AImprove calculation accuracyaccurately determineConstructionsBorehole/well accessoriesGeosteeringEnergy window
According to the high-precision while-drilling natural gamma-ray spectrum imager, a high-precision gamma-ray spectrum detector is selected as a sensor module, a high-energy-resolution energy spectrum diagram is obtained through energy correction processing, a stable window method is selected for energy spectrum drift correction of instrument temperature change, and the energy spectrum drift correction step is simplified; the energy spectrum drift channel number and the energy window moving range are determined by searching a K peak, a U peak and a Th peak so as to ensure the accuracy of energy window division, the high-precision potassium, uranium and thorium element content measured in real time in each sector in the stratum is obtained after spectrum unfolding, data processing, interpolation imaging and other operations are carried out according to the measurement result of each sector, and the accuracy of energy window division is improved. The real-time azimuth imaging graph of each sector is displayed, parameters such as the organic carbon content and the shale type can be accurately judged according to the imaging graphs, more accurate and more comprehensive information is provided for geosteering, the drilling success rate is greatly increased, and the operation risk is reduced.
Owner:ARENA PETRO
Multi-dimensional geosteering method for middle-deep layer coal bed gas horizontal well
The invention discloses a multi-dimensional geosteering method for a middle-deep layer coal bed gas horizontal well. The method comprises the following steps that S1, three-dimensional earthquake-geologic models of a marker bed and a target coal bed are established; s2, the hole drift angle of each marker bed during drilling is determined; s3, predicting the depth, thickness, stratigraphic dip and spatial distribution characteristics of the target coal seam; s4, ensuring accurate target entering of the horizontal well by adopting a layer-by-layer approaching method; s5, comprehensively analyzing horizontal section data to ensure high drilling rate; the method is suitable for the technical field of coal bed gas development, the marker bed hole drift angle layer-by-layer approaching control target entering technology is adopted, the optimal hole drift angle of each marker bed is quantitatively determined, in the actual drilling process, geosteering personnel only need to judge whether the hole drift angle meets the design or not when drilling is carried out on each marker bed, the analysis content and steps are simplified, and the efficiency is improved. And the analysis time when the depth deviation with the designed marker bed is large is saved, and the drilling time efficiency is improved.
Owner:SHANXI JINXIANG COAL-TO-GAS CO LTD +4
Intelligent underbalanced coiled tubing drilling (UBCTD) geosteering operations advisory system and method of use
A method that may include obtaining well path data describing a first well path through one or more formations. The method may include obtaining first acquired drilling parameter data in real-time during a drilling operation for a predetermined well, wherein the drilling operation corresponds to the first well path. The method may include determining, by a computer processor, first predicted drilling data using a machine-learning model, the well path data, and the first acquired drilling parameter data, wherein the first predicted drilling data may include a predicted well path. The method may include determining whether the first predicted drilling data satisfies a predetermined criterion. The method may include determining, in response to determining that the first predicted drilling data fails to satisfy the predetermined criterion, an adjusted well path. The method may include transmitting a first command to update the drilling operation to implement the adjusted well path.
Owner:SAUDI ARABIAN OIL CO
Electromagnetic inversion method and device based on well electric shock joint modeling
PendingCN119556369AReduce the multi-solution of electromagnetic inversionadd depthGeological measurementsGeosteeringWell logging
The invention relates to geophysical inversion, in particular to an electromagnetic inversion method based on well electric-seismic joint modeling, which comprises the following steps: acquiring actually measured apparent resistivity data; well-to-seismic joint stratum thickness and stratum apparent resistivity modeling based on geosteering; performing one-dimensional band source apparent resistivity inversion based on a nonlinear least square fitting algorithm; and outputting a stratum apparent resistivity inversion result. The method is based on geosteering, the advantages of three geophysical prospecting methods of earthquake, logging and electromagnetism are fully fused and played, the multiplicity of electromagnetic inversion solutions is reduced, the inversion depth and accuracy are improved, and powerful guarantee is provided for subsequent section interpretation, well position deployment, fluid identification and other operations. The invention also provides a device for realizing the electromagnetic inversion method based on well electric shock joint modeling.
Owner:SI CHUAN SHENG ZI RAN ZI YUAN TOU ZI JI TUAN WU TAN KAN CHA YUAN YOU XIAN GONG SI
Geosteering control framework
A system and method may include receiving data acquired by a downhole tool of a tool string disposed at least in part in a borehole in a subsurface region. The system and method may also include inverting the data using a trained machine learning model to generate a structural feature of the subsurface region. The system and method may further include controlling operation of the tool string based at least in part on the structural feature of the subsurface region.
Owner:SCHLUMBERGER TECH CORP
Near-bit formation resistivity imaging system and method
PendingCN119412022AReal-time measurementRealize the display effectSurveyWater resource assessmentGeosteeringGround system
The invention discloses a near-bit formation resistivity imaging system and method. The near-bit resistivity imaging and wireless signal transmitting short section performs multi-sector resistivity measurement under at least one depth of a near bit and encoding and transmitting of wireless short transmission electromagnetic wave signals through a resistivity button electrode array; the wireless signal receiving short section receives the cross-screw wireless short transmission electromagnetic wave signal and decodes and transmits the cross-screw wireless short transmission electromagnetic wave signal to the slurry pulse transmission short section; the mud pulse transmission short section is used for coding resistivity measurement data and transmitting the resistivity measurement data to a ground system in a mud pulse manner; and the ground system receives, decodes, displays and images the mud pulse signals. According to the technical scheme, near-bit resistivity imaging of different depths is achieved in the drilling process, real-time measurement, uploading and display of resistivity imaging data are achieved in the mode of cross-screw wireless electromagnetic wave short transmission and mud pulse combined transmission, refined geosteering under the complex geological condition is assisted, and the drilling efficiency is improved. And a technical support is provided for improving the drilling rate of oil and gas reservoirs.
Owner:CHINA NAT PETROLEUM CORP +1
Effective resistivity models for geosteering decisions
PCT designated stage expiredWO2025019024A1Electric/magnetic detection for well-loggingSurveyGeosteeringWell drilling
A method comprises obtaining measurement data of a subsurface formation while drilling a wellbore in the subsurface formation. The method comprises generating a horizontal resistivity model of the subsurface formation at respective depths along the wellbore based on the measurement data. The method comprises generating a vertical resistivity model of the subsurface formation at the respective depths along the wellbore based on the measurement data. The method comprises generating an effective resistivity at the respective depths along the wellbore based on the horizontal resistivity model and the vertical resistivity model to indicate a formation resistivity in each direction of the wellbore. The method comprises performing a drilling operation based on the effective resistivity.
Owner:HALLIBURTON ENERGY SERVICES INC
Geosteering Copilot Assistant
A method and a system comprising: disposing a bottom hole assembly (BHA) into a wellbore, wherein the BHA comprises a measurement assembly; acquiring one or more measurements with the measurement assembly; acquiring historical data from the wellbore; extracting relevant information from the historical data; training a machine learning (ML) model with the relevant information to form a trained ML model; and providing an answer to a question utilizing the trained ML model.
Owner:HALLIBURTON ENERGY SERVICES INC
Geosteering control framework
A method can include receiving data acquired via a drillstring in a borehole in a subsurface environment; determining boundary locations for formations in the subsurface environment using at least a portion of the data, where an end of the borehole is disposed in one of the formations; determining extended boundary locations in the subsurface environment for a region beyond the end of the borehole using the boundary locations; determining a target location in the region; generating a trajectory from an end of the borehole location to the target location; and executing a directional drilling system to control directional drilling of the drillstring that extends the borehole beyond the end of the borehole towards the target location.
Owner:SCHLUMBERGER TECH CORP
Geosteering parameter modeling method suitable for complex thin layer
The invention belongs to the technical field of petroleum and natural gas drilling exploration and development, and discloses a geosteering parameter modeling method suitable for a complex thin layer, which comprises the steps of seismic data collection and geological profile evaluation, geological data analysis and target window feature determination, drilling trajectory guiding model establishment, drilling dynamic tracking, real-time borehole correction and the like. And accurate guiding is realized. Target window control is carried out by combining a layer thickness method and a segmentation method, and a drilling trajectory is monitored in real time by adopting a'five maps and one table 'tracking method, so that efficient passing of a drill bit in a target reservoir is ensured. According to the method, the drilling rate under the narrow target window geological condition is remarkably improved, the drilling risk is reduced, and the development efficiency and economic benefits of the shale gas well are improved.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
Intelligent real-time updating method and system for stratigraphic framework with geosteering-while-drilling
The present disclosure belongs to the field of geological prospecting and particularly relates to an intelligent real-time updating method and system for a stratigraphic framework with geosteering-while-drilling, aiming to solve the problems of insufficient precision in position and dipping angle of a stratigraphic framework due to differences in parameters measured by different instruments for well logging and mud logging while drilling. The method of the present disclosure comprises: obtaining existing well data, and acquiring well logging data and images imaged while-drilling in real time; constructing an initial stratigraphic framework model, eliminating abnormal values, and conducting dimensionality reduction; and based on dimensionality reduction well logging data, conducting non-linear clustering through a density peak clustering method, obtaining a marker layer primary prediction result through a marker layer prediction model of a depth belief network and conducting correction, to obtain a corrected stratigraphic framework model and to adjust a drilling trajectory.
Owner:INSTITUTE OF GEOLOGY AND GEOPHYSICS CHINESE ACADEMY OF SCIENCES
Well logging while drilling data transmission system and transmission method based on underwater acoustic communication technology
The invention provides a logging-while-drilling data transmission system and method based on an underwater acoustic communication technology, and the method comprises the steps: enabling logging-while-drilling data to be intelligently compressed through an annular underwater acoustic communication transmitting transducer disposed at the upper end of a logging-while-drilling short section and an annular underwater acoustic communication receiving transducer at a well mouth, and converting the data into a sound wave signal at a well bottom; the drilling fluid is sent from the well bottom to the well mouth in an underwater acoustic communication or acoustic wave mode through a drilling fluid channel in the drill hole. The real-time transmission efficiency of the logging-while-drilling data can be greatly improved through the rate of underwater acoustic communication, and the logging-while-drilling data can be rapidly provided for well drilling engineers in real time. Real-time processing and comprehensive explanation are carried out on logging while drilling data transmitted in real time on a drilling site, and real-time optimization and adjustment of a well track can be carried out according to a comprehensive explanation result, so that intelligent geosteering drilling is realized, the drilling rate of a high-quality reservoir is finally improved, and the oil and gas yield of a single well is increased.
Owner:OPTICAL SCI & TECH (CHENGDU) LTD
Coal bed gas horizontal well geosteering device
The utility model discloses a coal bed gas horizontal well geosteering device, which relates to the technical field of geosteering equipment, and comprises a base, a sliding seat is arranged on the base in a sliding manner, a positioning plate is mounted on the sliding seat, the top end of the positioning plate is connected with a drill rod through a bearing, a driven gear is mounted at the tail end of the drill rod, and the driven gear is meshed with the sliding seat. The driven gear is meshed with a transmission gear, the transmission gear is driven by a motor, and a sliding groove is formed in the drill rod. According to the coal bed gas horizontal well geosteering device, the arranged pushing structure drives the linkage rod to slide in the sliding groove, the adjusting plate can be driven to deviate with the positioning shaft as the axis through cooperation of the mounting groove, the swing groove, the pushing rod and the positioning shaft, and the adjusting plate drives the drill bit to conduct deviation adjustment relative to the drill rod; the structure is integrally arranged on the inner side of the drill rod and can be protected, the driving source is arranged at the tail end of the drill rod through linkage of the linkage rod, and power supply is not affected.
Owner:SHAANXI HUACHEN GASOLINEEUM TECH
A method for predicting fractured carbonate buried hill reservoirs based on geological guidance and multi-scale fusion.
This invention relates to the field of geophysical exploration and oil and gas geological analysis technology, and discloses a method for predicting fractured reservoirs in carbonate buried hills based on geological guidance and multi-scale fusion. The method includes: constructing a three-dimensional geological guidance constraint body using paleogeography and fault systems as geological priors; characterizing the fracture response mechanism using Gabor wavelet frequency division and structural tensor; constructing sensitive attributes and predicting the fracture body using a multi-branch convolutional neural network that fuses multi-source seismic attributes; and calculating the fracture complexity index based on the predicted fracture body to classify and zone the buried hill fractures. This invention introduces geological guidance constraints to improve the geological consistency of the prediction results; utilizes multi-scale Gabor frequency division and structural tensor analysis to achieve multi-scale fracture characterization; enhances model interpretability and prediction accuracy by fusing multi-source attributes through a multi-branch convolutional neural network; and achieves quantitative reservoir classification through the fracture complexity index, effectively guiding well location deployment and drilling decisions.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Thin reservoir horizontal well geosteering method based on three-dimensional model real-time adjustment
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.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
Geosteering methods and systems for improved drilling performance
A method and system for geosteering may generate a misfit function using a spline function. The misfit function may be used to accurately map errors or differences between TVD-based measurement data for one or more reference wells and MD-based measurement data collected during drilling of a subject well, in order to accurately determine a stratigraphic location of the subject well.
Owner:MAGNETIC VARIATION SERVICES LLC
Method and device for measuring radial detection depth of near-bit azimuth gamma while-drilling tool
The invention discloses a measuring method and device for the radial detection depth of a near-bit azimuth gamma tool while drilling. The measuring method comprises the steps that an azimuth gamma receiving short section is arranged around an azimuth gamma transmitting short section; according to the outer diameter of the azimuth gamma emission nipple, a gamma source rock core with the radiation intensity matched with the inner diameter is selected; the gamma source core is arranged outside the azimuth gamma emission short section in a sleeving mode; testing the gamma counting rate of the near-bit azimuth gamma while-drilling tool; increasing the radial width of the gamma source rock core, and testing the gamma counting rate; when the gamma source core is increased from a target radial width and the gamma counting rate cannot be increased, the target radial width is the radial detection depth of the near-bit azimuth gamma while-drilling tool under a radiation intensity; the gamma source cores with different radiation intensities are replaced, and radial detection depths under different radiation intensities are measured. According to the method, the intuition and the reliability of a measurement result are improved, so that field geosteering and well track adjustment can be guided and supported more accurately.
Owner:CHINA NAT PETROLEUM CORP +1
Complex structure stratum while-drilling azimuth electromagnetic wave logging parameterization inversion method
The invention discloses a complex structure stratum while-drilling azimuth electromagnetic wave logging parameterization inversion method, and belongs to the field of oil exploration and development. The method comprises the following steps: s1, modeling a complex geologic structure, constructing a 2D complex geologic model, and parameterizing the 2D complex geologic model; s2, analyzing response characteristics of the 2D complex geological model according to the 2D complex geological model established in the s1, and carrying out influence factor and sensitivity analysis; s3, obtaining observation data according to response characteristics of s2, and constructing an objective function; and s4, in combination with s2 and s3, performing inversion on the parameterized 2D complex geological model by using a PT-MCMC inversion method to realize fine reconstruction of the complex stratum. According to the method, fine reconstruction of the complex stratum is achieved, good inversion precision is achieved, and the characterization capacity and the calculation efficiency are both considered. The method provides support for real-time geosteering, reservoir evaluation, layer interface prediction and the like of oil and gas fields.
Owner:SOUTHWEST PETROLEUM UNIV
A method for geosteering a horizontal well
The application discloses a horizontal well geosteering method, comprising the following steps: acquiring basic data of adjacent wells around a to-be-drilled horizontal well; comparing target reservoirs to obtain the numerical values of the top depth and the bottom depth of the target reservoirs of the adjacent wells and the predicted values of the top depth and the bottom depth of the to-be-drilled horizontal well; comparing X-ray element data to predict the sandstone types of the target reservoirs and the reaction characteristics of the X-ray element data; obtaining the reservoir thicknesses of each adjacent well and the to-be-drilled horizontal well, and establishing a target reservoir thickness model; when the to-be-drilled horizontal well is under construction, drilling to a target point, analyzing and judging whether the actual sandstone type of a drilled formation is the predicted sandstone type, analyzing whether the actual sandstone type is consistent with the predicted value, and when the results are all yes, determining that the model is correct, and continuing to perform horizontal well geosteering. The method can timely correct the prediction result of a seismic inversion reservoir, provide a basis for trajectory adjustment of horizontal well construction, improve the drilling rate of the reservoir, and improve the success rate of trajectory adjustment.
Owner:CHINA PETROCHEMICAL CORP +3
Methods and systems for predicting fluid type while geosteering
A method for predicting fluid properties includes measuring one or more measured fluid properties of a mud gas at a surface of a wellbore. The method also includes measuring one or more mud gas properties of the mud gas at the surface of the wellbore. The method also includes predicting one or more first predicted fluid properties using one or more pre-trained machine-learning (ML) models. The one or more first predicted fluid properties are predicted based at least partially upon the one or more mud gas properties. The method also includes comparing the one or more measured fluid properties to the one or more first predicted fluid properties. The method also includes re-training the one or more pre-trained ML models to produce one or more re-trained ML models in response to the comparison.
Owner:SCHLUMBERGER TECH CORP