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79 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.
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
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
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
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
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
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
A method of optimizing a geological model by scanning the hole angle
This invention discloses a method for optimizing a geological model by scanning the well inclination angle. It aims to solve the problem of low efficiency and poor accuracy in directional drilling where the geological model inclination angle is constantly fitted to the actual drilling curve to correct the geological model. The core steps are as follows: Step 1: Establish a geological steering model for the current drilling based on the logging and structure of the completed well. Step 2: Set the actual logging curve of the drilling trajectory AB segment as the target curve, and extract the simulated curve from the geological steering model along this segment of the well trajectory. Step 3: Set the inclination scanning range 'a' and the scanning step size 'dlt', read the well inclination angle ∠A at point A, and perform an inclination scanning of the well inclination of segment AB with a step size of 'd1t' within the range of ∠A-a to ∠A+a, extracting the simulated curve from the model at each inclination angle. Step 4: Calculate the similarity between the simulated curve and the target curve using the similarity calculation formula within the range of ∠A-a to ∠A+a, and record the inclination angle difference when the similarity is the maximum. Step 5: Use the angle difference recorded in Step 4 to make the geological model angle after point A equal to the original angle plus the angle difference. Step 6: To ensure continuous model updates, calculate the inclination point forward from point A, thereby guiding directional drilling.
Owner:SINO-OIL SUNSHINE (BEIJING) SCI & TECH CO LTD
A non-contact rotary electric and signal transmission device for rotary geological guidance
This utility model relates to the field of geological exploration equipment and power generation technology, and in particular to a non-contact rotary power and signal transmission device for rotary geological steering. The device includes a main body with connecting components fixedly connected to its side. By integrating the power generation mechanism coaxially with the geological steering sub, this utility model avoids the need for additional power generation devices installed outside the drill string or in other locations downhole. This simplifies the overall drilling system structure, reduces space constraints caused by additional components, facilitates operation in confined wellbore environments, does not disrupt the normal drilling process, and eliminates the need for large-scale modifications to existing drilling techniques and equipment. The device can seamlessly integrate with existing rotary geological steering systems, ensuring uninterrupted geological steering functionality. Precise control of the air gap between the stator coil and the permanent magnet rotor is required to ensure high magnetic coupling efficiency while avoiding excessive mechanical vibration and damage.
Owner:BEIJING JIAHE HUITUO PETROLEUM TECH
A multi-element information fusion based deep shale gas horizontal well geosteering method
The present application belongs to the technical field of horizontal well geosteering, and discloses a multi-element information fusion based deep shale gas horizontal well geosteering method, which comprises box optimization, pilot plan modeling, accurate landing and target entering, and horizontal section accurate adjustment. The present application is used for multi-element information fusion based deep shale gas horizontal well geosteering, and rich techniques and methods are accumulated for deep shale gas horizontal well geosteering technology. Through rapid identification of box characteristics, real-time tracking and research, accurate landing and target entering, and fine geosteering tracking, the horizontal section box drilling rate is continuously improved.
Owner:PETROCHINA CO LTD
Stratigraphic dip angle calculation method based on horizontal well geosteering while drilling
The invention discloses a stratigraphic dip angle calculation method based on horizontal well geosteering while drilling, which belongs to the technical field of drilling engineering, and specifically comprises the following steps: determining the reservoir thickness of a horizontal well according to drilling information of a vertical well of an adjacent framework of the horizontal well; determining the distance from a window entering point of the horizontal well to the top of a reservoir, the current hole drift angle of the horizontal well and the length of a horizontal section when the horizontal well penetrates out of a target stratum according to actual drilling information of the horizontal well; the stratum tendency is determined according to the field seismic section condition, and whether the horizontal well drills through the stratum belongs to top penetration or bottom penetration is judged; and calculating a stratigraphic dip by combining the thickness of the horizontal well reservoir, the distance from the window entering point of the horizontal well to the top of the reservoir, the current hole drift angle of the horizontal well, the length of the horizontal section when the horizontal well penetrates out of the target layer, the stratigraphic tendency and the condition that the horizontal well penetrates out of the reservoir. The technical problem that in the prior art, the stratigraphic dip angle cannot be calculated under the condition that no geophysical analysis condition exists or geophysical accurate testing cannot be carried out is solved.
Owner:PETROCHINA CO LTD
Horizontal well while-drilling geological early warning method and device
The embodiment of the invention discloses a horizontal well while-drilling geological early warning method and device. The method comprises the following steps: acquiring adjacent well data and designed horizontal well trajectory data, and establishing a first geosteering model of a designed well according to the adjacent well data and the designed horizontal well trajectory data; acquiring actual drilling data of the first drilling, and loading the actual drilling data of the first drilling to the first geosteering model to obtain a second geosteering model of the actual drilling; real drilling data in the drilling process are obtained in real time, the second geosteering model is updated according to the real drilling data obtained in real time, a geosteering stage is determined based on the first geosteering model and the second geosteering model, and an early warning mechanism and an early warning threshold value corresponding to the geosteering stage are determined; a first early warning parameter and a second early warning parameter are obtained, and horizontal well while-drilling geological early warning is conducted according to the first early warning parameter, the second early warning parameter, the early warning mechanism and the early warning threshold value. Therefore, the non-production time and the windowing failure rate are reduced, and the drilling rate of the reservoir is improved.
Owner:CHINA OILFIELD SERVICES LTD
A Multi-Dimensional Geological Steering Method for Horizontal Wells in Medium-Deep Coalbed Methane Formations
This invention discloses a multi-dimensional geological steering method for horizontal wells in medium-deep coalbed methane formations, comprising the following steps: S1 establishing a three-dimensional seismic-geological model of the marker layer and the target coal seam; S2 determining the well inclination angle of each marker layer encountered; S3 predicting the depth, thickness, dip angle, and spatial distribution characteristics of the target coal seam; S4 using a layer-by-layer approximation method to ensure accurate target entry of the horizontal well; S5 comprehensively analyzing horizontal section data to ensure a high drilling success rate; S6 adjusting and optimizing the model. This invention is applicable to the field of coalbed methane development technology. It adopts a layer-by-layer approximation control technique for the well inclination angle of the marker layer to quantitatively determine the optimal well inclination angle for each marker layer. During actual drilling, geological steering personnel only need to determine whether the well inclination angle meets the design when each marker layer is encountered, simplifying the analysis content and steps, saving analysis time when there is a large deviation from the designed marker layer depth, and improving drilling efficiency.
Owner:SHANXI JINXIANG COAL-TO-GAS CO LTD +4
Anticorrelation in propagation resistivity logs for geosteering
PCT designated stageWO2025221450A1Electric/magnetic detection for well-loggingSurveyGeosteeringWell logging
Aspects of the disclosure provide for using anticorrelation in propagation resistivity logs to detect boundary approaching conditions. Geosteering may be performed based on the detected boundary approaching conditions. The boundary detection and geosteering may be for a high angle well. The anticorrelation may be between attenuation resistivity and phase shift resistivity.
Owner:SCHLUMBERGER TECH CORP +3
Geological steering method established based on interactive seismic forward modeling
PendingCN121956138ADiscretization adaptability is strongSolve the problem of insufficient characterizationSurveySeismic signal processingGeosteeringPorosity
The invention discloses a geosteering method based on interactive seismic forward modeling establishment, and relates to the technical field of geosteering in oil-gas exploration and development. The method comprises the steps of firstly establishing a work area and constructing a seismic wave velocity field through an interactive interface, then generating a depth domain seismic section, then interactively drawing a stratigraphic position line and a fault line based on the section, discretizing the stratigraphic position line and the fault line into a space point set with geological attributes, then constructing a triangular mesh model based on the point set, identifying a stratigraphic framework, and finally, constructing a seismic wave velocity field based on the triangular mesh model. Then dynamically estimating shale content and porosity based on measured data of a drilled section, obtaining longitudinal wave velocity through rock physical forward modeling, extrapolating and interpolating the longitudinal wave velocity by combining a stratigraphic framework, establishing a velocity model for seismic forward modeling, and performing seismic wave field forward modeling to obtain a seismic wave field; and finally, carrying out multi-dimensional feature comparison on the forward modeling response and the actual seismic section, if a matching criterion is met, making a guiding strategy, otherwise, reversely adjusting model parameters and carrying out forward modeling iteration again until matching.
Owner:CORGIS PETROLEUM TECH CONSULTING (BEIJING) CO LTD
A method for multi-layer formation inversion of a while-drilling electromagnetic boundary-probe instrument
ActiveCN121500419BElectric/magnetic detection for well-loggingBorehole/well accessoriesGeosteeringAlgorithm
The present application relates to well logging technology, and discloses a multilayer formation inversion method of a while-drilling electromagnetic boundary detection instrument, which comprises two stages of offline training and online inversion. In the offline stage, first, a plurality of formation structure types are constructed and training samples are generated; then, the original response vector of the forward modeling of the samples is enhanced and reconstructed to improve the data dimension and sensitivity; then, for each formation type, a dedicated gradient optimization set is trained by a supervised descent method. In the online stage, the original response measured in real time is subjected to the same feature reconstruction, and its belonging formation type is intelligently judged, and the matched gradient optimization set is automatically called to perform rapid iterative inversion. In the inversion iteration, dynamic attenuation regularization and geological prior constraint are integrated to effectively suppress noise, guarantee stability and geological rationality. The present application realizes rapid, accurate and stable inversion of complex multilayer formation, and significantly improves the reliability of while-drilling geosteering.
Owner:YIBIN KUNTUOSHEN ELECTRONIC TECHNOLOGY CO LTD
Method and device for spatial homing of horizontal well geosteering picture to 3D seismic
The application discloses a horizontal well geosteering picture three-dimensional seismic space homing method and equipment, and belongs to the field of physical exploration. The application finally obtains three-dimensional seismic data volume after space homing of a geosteering picture through the following steps: collecting data, establishing a well track information base, obtaining digital information in the geosteering picture after digitizing the engineering drawing, obtaining the space coordinates of the geosteering picture by using the well track information base, three-dimensional seismic space homing of a target formation geosteering picture and the like. The application uses the well track as a bridge, and directly connects the two-dimensional geosteering result with the three-dimensional seismic, so that the geosteering picture reflects the real stratum, and the three-dimensional seismic data volume directly embodies the real stratum, the purpose of objectively evaluating the three-dimensional seismic data volume from the same observation angle, and effectively predicting the depth, the dip angle, the breakpoint position and the microstructure is achieved. The application is applied to shale gas horizontal well drilling, and is further applied to the explanation and analysis of the geological structure.
Owner:CHINA NAT PETROLEUM CORP +1
Geosteering method based on formation dielectric properties estimated from logging-while-drilling measurements
A drilling system performs a method for identifying a reservoir in a formation. The processor measures a first dielectric constant of the formation at a selected depth or depth interval using a first electromagnetic wave or signal emitted through the formation at the selected depth or depth interval in a borehole in the formation at a first frequency; measuring a second dielectric constant of the formation at a selected depth or depth interval using a second electromagnetic wave or signal emitted through the formation at a second frequency at the selected depth or depth interval in the borehole in the formation; and identifying a reservoir in the formation based on the first dielectric constant at the selected depth or depth interval and the second dielectric constant at the selected depth or depth interval.
Owner:BAKER HUGHES OILFIELD OPERATIONS LLC
A rotary steering device for zero blind area geological parameter measurement
This application provides a rotary steering device for zero-blind-zone geological parameter measurement, relating to the field of engineering drilling technology. It includes a connecting section, an upper spindle, a lower spindle, and a drill bit connected in sequence. The connecting section houses a power supply and communication module. The upper spindle has a bushing with a rotary steering module mounted on it, and the lower spindle houses an azimuth gamma geological steering module. It also includes two transmission mechanisms. The first transmission mechanism comprises a first part and a second part, which generate an excitation magnetic field to electrically connect the power supply and communication module to the rotary steering module. The second transmission mechanism comprises a third part and a fourth part, which abut against each other to electrically connect the power supply and communication module to the azimuth gamma geological steering module. By using the second transmission mechanism to power and communicate with the azimuth gamma geological steering module, and using the first transmission mechanism to power and communicate with the rotary steering module, near-drill bit measurement capabilities are integrated into the rotary steering system, achieving closed-loop steering control, improving drilling accuracy, and ensuring wellbore trajectory quality.
Owner:ORIENT ENERGY & TECH CO LTD
Real time interactive geosteering using virtual reality
Examples of a method, system, and control system are disclosed herein. In one embodiment, a method comprises obtaining real time measurement data of a subsurface formation while drilling one or more wellbores into the subsurface formation; performing inversions of the measurement data to transform the measurement data into physical geology representations surrounding the one or more wellbores; communicating the measurement data and physical geology representations with two or more users, the two or more users including at least one remote user equipped with virtual reality (VR) equipment configured for interactive viewing of the measurement data and geology representations in real time and interactive control of drilling operations at the one or more wellbores; receive inputs from the two or more users; and adjusting at least one drilling parameter in at least one wellbore during drilling operations in response to the inputs from at the at least one remote user.
Owner:HALLIBURTON ENERGY SERVICES INC
Shale oil dessert guiding method based on all-component hydrocarbon correction and astronomical framework
PendingCN121915906Aimprove accuracyIndex improvesSurveyEarth material testingGeosteeringWell logging
The invention belongs to the technical field of petroleum and natural gas geological exploration and development, and particularly relates to a shale oil dessert guiding method based on all-component hydrocarbon correction and an astronomical framework. The method comprises the following steps: 1, acquiring a shale full diameter or well wall coring sample of a target block and logging data; 2, performing controlled experiment treatment on the rock sample to obtain original pyrolysis parameters and light hydrocarbon loss; 3, constructing an all-component free hydrocarbon recovery model, and obtaining the corrected real free hydrocarbon content; 4, carrying out detrending and pre-whitening pretreatment on the natural gamma logging curve of the target well; 5, mapping the corrected total organic carbon and oil saturation index to the isochronous framework; 6, according to geochemical parameters, shale oil dessert grading evaluation standards are established, and dessert layers of a class I, a class II and a class III are divided; 7, based on stratigraphic framework and dessert layer phase distribution, horizontal well trajectory design and real-time geosteering are guided. And the longitudinal resolution and the transverse isochronism of sweet spot prediction are effectively improved.
Owner:NORTHEAST GASOLINEEUM UNIV
A logging while drilling and measurement integrated drill tool combination
This invention discloses an integrated logging-while-drilling (LOD) and measurement drill string assembly, relating to the field of oil and gas drilling engineering technology. It provides a series connection scheme for core protective drill string components, offering two switchable configurations: one with a mud motor and one without. Both configurations consist of an azimuth density neutron logging sub, a bidirectional communication power supply sub, an acoustic logging sub, a resistivity logging sub, an upper connecting sub, a flexible sub, a lower connecting sub, an azimuth gamma logging sub, and a steering actuator connected in series according to a fixed logic. The configuration with a mud motor only requires adding a mud motor at a designated location to complete the structural switch, without changing the series connection of the remaining subs. This assembly scheme is applicable to various drilling scenarios such as offshore exploration and development, deepwater drilling, complex directional wells, highly deviated wells, and horizontal wells. It enables integrated operations of geological steering, formation evaluation, and wellbore stability analysis during drilling, effectively improving drilling efficiency and reducing operational risks.
Owner:TIANJIN SHUZHI SPACE ENERGY EQUIPMENT CO LTD
While-drilling electromagnetic wave resistivity logging inversion method based on quasi-Newton method
The invention provides a while-drilling electromagnetic wave resistivity logging inversion method based on a quasi-Newton method, and relates to the technical field of oil-gas exploration and development, and the method comprises the steps: collecting the actual measurement response data of an isotropic or anisotropic target stratum, constructing a three-layer TI medium stratum model, and determining the to-be-inverted parameters; performing global optimization by adopting a genetic algorithm, and outputting an optimal result as an initial value; constructing a quasi-Newton inversion model containing a regularization term, dynamically updating a Jacobian matrix by using a Broyden updating rule, introducing a diagonal adaptive damping matrix to replace a fixed damping factor, and adaptively adjusting the damping strength according to a parameter relative increment ratio; and inputting the initial value into the improved model for iterative operation until a termination condition is met. The method gets rid of manual experience dependence, avoids local extremum convergence, improves the inversion precision, reduces the number of iterations, improves the calculation efficiency, accurately inverts key parameters, meets the requirements of real-time geosteering engineering, and improves the oil-gas exploration and development efficiency.
Owner:QILU UNIVERSITY OF TECHNOLOGY (SHANDONG ACADEMY OF SCIENCES)
A method for geosteering in a horizontal well in a tight sand gas reservoir
ActiveCN116856845Beffective combinationProtection methodSurveyDirectional drillingGeosteeringWell logging
This invention provides a geological steering method for horizontal wells in tight sandstone gas reservoirs. First, relevant data from the target well and adjacent wells are acquired. Then, using this data, the geological characteristics of the target sandstone body, its micro-structure, reservoir heterogeneity, and stratigraphic occurrence are determined. Next, using well logging interpretation from adjacent wells and geophysical channel characterization, a refined three-dimensional geological model based on seismic constraints is established to clarify the sandstone body distribution and interlayer development. A geological profile is established along the well trajectory to determine the location of the horizontal well trajectory. Finally, trajectory optimization is performed. This steering method effectively combines geological and seismic data, using three-dimensional geological modeling to reasonably predict the distribution of reservoir sandstone bodies and scientifically assess interlayer development. The geological steering method and its implementation effectiveness are effectively guaranteed, and it can meet the geological steering requirements of different gas reservoirs and well areas with significantly different geological characteristics.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
A method for improving the sweet spot drilling rate of horizontal wells using seismic-geological integration in volcanic formations
The present invention relates to the field of petroleum geology and is a method for improving the sweet spot drilling rate of horizontal wells by integrating seismic and geological methods in volcanic formations. The method comprises: basic data compilation, reservoir sweet spot identification, reservoir sweet spot inversion, fine velocity field construction, depth domain inversion modeling, model verification and correction, and geological guidance while drilling. The method for improving the sweet spot drilling rate of horizontal wells by integrating volcanic formation geology into the present invention is systematic and comprehensive. It can effectively improve the structural interpretation accuracy of volcanic formations with complex lithologic combinations, predict the distribution of interlayer tight oil sweet spots, reduce errors in horizontal well design, and reduce the number of adjustments during drilling. It can better optimize drilling trajectories while integrating engineering technologies, thereby improving the sweet spot drilling rate and has great application potential in oilfield development.
Owner:PETROCHINA CO LTD
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
Ai-assisted stratigraphic modeling and geosteering utilizing gamma ray measurements
PCT designated stageWO2025250915A1Directional drillingNuclear radiation detectionGeosteeringComputational physics
A method for modeling a subsurface region using Artificial Intelligence (AI), including: drilling of at least one reference well into a subsurface region, initializing a first stratigraphic model of the subsurface region, initializing a first gramma ray model, receiving first gamma ray measurements from a gamma ray sensor coupled to a first tool of a first drill string traversing the subsurface region during the drilling of an additional well, determining that a first difference between the first gamma ray model and the received first gamma ray measurements exceeds an error threshold, updating the first stratigraphic model based on the first difference, updating the first gamma ray model, and outputting the updated first stratigraphic model and the updated first gamma ray model.
Owner:SCHLUMBERGER TECH CORP +3