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45 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.
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
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
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
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
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
Dual sweet spot quantitative evaluation method and device for unconventional reservoirs
The present application relates to a kind of oil and gas exploration and development technical field, a kind of unconventional reservoir double sweet spot quantitative evaluation method, device, including in the same development horizon of the region to be evaluated, select m well to carry out fracturing test, downhole television test and production fluid profile analysis;Take the correlation degree of each double sweet spot reservoir sample with the multiple characteristic factors of logging data information is high, based on the weight coefficient of each characteristic factor obtained by grey correlation method;Determine the double sweet spot reservoir quality factor of each double sweet spot reservoir sample, when drilling geosteering, preferentially select the formation drilled by double sweet spot reservoir quality factor, when fracturing cluster design, preferentially select the cluster by double sweet spot reservoir quality factor for fracturing.The present application solves the problem that the sweet spot reservoir is directly evaluated by relying on logging static data, leading to the large deviation of the capacity of sweet spot reservoir and fracturing reconstruction, improves the matching rate of double sweet spot evaluation result and production after fracturing, improves the drilling rate of this kind of reservoir, realizes the effective fracturing of this kind of reservoir.
Owner:CHINA NAT PETROLEUM CORP +1
Ultra-deep well efficient rock breaking method based on special-shaped compact cutting tooth drill bit
The invention discloses an ultra-deep well efficient rock breaking method based on a special-shaped compact cutting tooth drill bit, and relates to the technical field of deep well rock breaking. The ultra-deep well efficient rock breaking method comprises the following steps that a first state event generated by a geosteering module is obtained; acquiring a second state event generated by a rock breaking parameter optimization module; the cooperative control center calls a preset cooperative strategy matrix for state matching based on the first state event and the second state event, a target cooperative strategy is determined, and the dimension of the cooperative strategy matrix is composed of geological demand strength and rock breaking efficiency strength; according to the target collaboration strategy, a collaboration instruction packet is generated, and the collaboration instruction packet at least comprises a track instruction sent to a track control module and a parameter adjustment constraint instruction sent to a rock breaking parameter optimization module; the cooperative instruction packet is issued to a track control module and a rock breaking parameter optimization module; the stability of the rock breaking efficiency is greatly improved.
Owner:XINJIANG PETROLEUM ENERGY SERVICE CO LTD
Drilling systems for geosteering with historical data and associated methods and devices
PCT designated stageWO2026135969A1Directional drillingAutomatic control for drillingGeosteeringWell drilling
A method of drilling a wellbore includes collecting historical data from a formation. The method further includes defining a stratigraphic signature of a region of interest in the historical data. The method also includes identifying boundary conditions of the region of interest. The method further includes capturing a real-time measurement from a downhole tool. The method also includes comparing the real-time measurement to the historical data. The method further includes determining a probability of the real-time measurement from the downhole tool being vertically positioned in the region of interest.
Owner:BAKER HUGHES OILFIELD OPERATIONS LLC
Anticorrelation in propagation resistivity logs for geosteering
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
Geosteering control framework
Owner:SCHLUMBERGER TECH CORP
Geosteering control framework
A method may include receiving resistivity data acquired by a downhole tool of a drillstring disposed at least in part in a borehole in a subsurface environment, where the borehole includes a downhole end, and where the borehole defines a borehole axis; receiving seismic data for the subsurface environment, where the seismic data include spatial locations; and generating a displacement field using the resistivity data and the seismic data, where the displacement field specifies displacement values with respect to the spatial locations of the seismic data.
Owner:SCHLUMBERGER TECH CORP
Inversion method for borehole electromagnetic wave detection interface and implementation system thereof
ActiveCN115980861BElectric/magnetic detection for well-loggingWater resource assessmentGeosteeringAnalogue computation
This invention discloses an inversion method for azimuth electromagnetic wave (AEM) detection interfaces during drilling, comprising: performing forward modeling simulations on different historical logging state points based on historical logging data, historical steering information, and geological information related to the target layer in the target reservoir area; calculating the amplitude ratio and phase difference data corresponding to each measuring point; training a preset neural network model based on this to generate a logging inversion model for realizing the inversion of azimuth electromagnetic wave logging data; acquiring the amplitude ratio and phase difference data of the current measured point obtained by the azimuth electromagnetic wave detection instrument during logging while drilling; and using the logging inversion model to output the corresponding logging inversion results for real-time geological steering. This invention eliminates the need to store a large forward model library, has high computational efficiency, can be used for real-time geological steering, and eliminates the cumbersome calibration process of azimuth electromagnetic waves, directly mapping the measurement signal to the geological signal.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
Method for improving geosteering traversal rate based on deep learning
The invention relates to the field of geological exploration, and discloses a method for improving geosteering traversal rate based on deep learning, comprising: performing stratum occurrence analysis on a target work area to obtain a first analysis result, and predicting a trajectory trend of a drilling horizontal section based on the result; geological feature data and historical while-drilling curve data in the target work area are obtained, and geological attributes of a target stratum are analyzed according to the data; constructing a deep learning algorithm learning library based on historical while-drilling curve data; based on a deep learning algorithm learning library, constructing a small-layer automatic identification model through feature optimization and algorithm training; preprocessing the forward drilling while-drilling curve data, and inputting the data into the small-layer automatic identification model to obtain small-layer probability distribution; on the basis of the small layer probability distribution, obtaining actual geological small layer classification of the position where the drill bit is located through data inverse coding; and generating a trajectory regulation and control instruction according to the actual geological small layer classification so as to improve the geosteering penetration rate of the high-quality reservoir of the horizontal well.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
Active geosteering method for horizontal section of horizontal well
The invention relates to the technical field of oilfield exploration, development and evaluation, in particular to an active geosteering method for a horizontal section of a horizontal well. The method comprises the steps that a target horizontal well and a reference well are determined, and the spatial relation between the initial actual drilling track of the target horizontal well and an initial actual drilling target layer is determined; a target actual drilling track is obtained, a target actual drilling target layer is determined, and the space relation between the target actual drilling track and the target actual drilling target layer is determined; based on the target horizontal well actual drilling track and the target actual drilling target stratum, comprehensively obtaining a predicted target stratum by means of multiple prediction methods; selecting at least two control points in the obtained prediction target layer; connecting the control points in sequence by taking the current well bottom as a starting point to obtain a pre-drilling track; drilling the target horizontal well according to the pre-drilling track; and the steps are executed circularly until the final target point is reached, and drilling is completed. According to the method provided by the invention, various information sources are comprehensively utilized, the well track is actively corrected, and the drilling rate, the recovery rate and the economic efficiency of the oil-containing sandstone are improved.
Owner:DAQING OILFIELD CO LTD +1
Horizontal well soft landing geosteering method
The invention relates to a horizontal well soft landing geosteering method, and belongs to the technical field of petroleum and natural gas exploration and development. The horizontal well soft landing geosteering method which is simple and convenient to operate, scientific and rigorous is provided by fully utilizing the key influence factor of the stratum vertical thickness, climbing for looking for, searching for the soft landing point, anchoring the soft landing point and taking the soft landing point as the target as the guidance. The method has general applicability to whether the mark and the target layer have the same inclination and inclination angle in exploration and development mine field practice, namely whether the vertical thickness of the overlying stratum of the target layer changes in the three-dimensional space or not, the method is scientific and rigorous, easy to operate and accurate in result, soft landing of the horizontal well can be completely achieved, and the method has a wide application prospect. And powerful technical support is provided for high-efficiency passing of the horizontal section after soft landing and realization of two core key indexes of reservoir height drilling encounter rate and track smoothness of the horizontal well.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
Geosteering control framework
Owner:SCHLUMBERGER TECH CORP
Automatic geosteering based on distance to oil-water contact
Examples described herein provide a computer-implemented method for performing automatic geosteering. The method includes receiving, by a processing system, formation evaluation data from a bottom hole assembly disposed in a wellbore. The method also includes determining, by the processing system, position data of a formation boundary from the formation evaluation data. The method also includes extrapolating, by the processing system, the position data to generate extrapolated position data of the formation boundary. The method also includes adjusting a trajectory of the wellbore based at least in part on the extrapolated position data of the formation boundary.
Owner:BAKER HUGHES OILFIELD OPERATIONS LLC