89 results about "Lithic fragment" patented technology

The invention provides an old well reexamination method and system based on a multi-modal digital rock debris virtual well, and the method comprises the steps: obtaining mineralogical data of an old well rock debris sample, optimizing an original well logging curve of an old well through the combination of Bayesian correction, predicting an undrilled layer of the old well through the constraint of a long-short-term memory network neural model and seismic data, and obtaining an optimal well logging curve; and the potential level of the undrilled layer of the old well is quantitatively evaluated through the potential matrix, so that the problems of deep rock debris data, low review efficiency and difficulty in potential layer identification in traditional old well review are solved.

The invention relates to the technical field of oil and gas drilling and production, and discloses a method for determining the sphericity of rock debris, computing equipment and a machine readable storage medium. The method for determining the sphericity of the rock debris comprises the following steps: acquiring an original image of a rock debris sample, and preprocessing the original image to obtain a target image; according to the target image, edge detection is carried out, rock debris adhesion particles are separated, the rock debris contour is determined, geometric parameter calculation is carried out according to the rock debris contour, target geometric parameters of the rock debris sample are determined, and the target geometric parameters comprise the actual area, the perimeter, the minimum circumcircle area, the equivalent ellipse long axis length and the equivalent ellipse short axis length; and determining the rock debris sphericity of the rock debris sample according to the target geometric parameter and the lithology type of the rock debris sample. Finally, high-precision, high-efficiency and low-cost rock debris sphericity measurement is realized.

A continuous logging method and device is provide, where the method includes obtaining drilling fragment samples and full-diameter core samples, and screening out target rock cuttings from the drilling fragment samples; performing a micro-indentation experiment on the target rock cuttings to obtain a static parameter thereof; performing a triaxial compression experiment on the full-diameter core samples to obtain a dynamic parameter and a static parameter thereof; determining a first correspondence between the static parameter of the target rock cuttings and the dynamic parameter of the full-diameter core samples; determining a second correspondence between logging data and the static parameter of the target rock cuttings based on the first correspondence; and drawing a formation mechanical property profile based on the second correspondence. The method solves the problem of conventional methods which cannot draw a continuous and complete profile of the mechanical property of the whole well section.

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

The invention belongs to the technical field of seismic exploration, and discloses a multi-source data fusion-based real-time logging-while-drilling rock debris lithology identification method, which comprises the following steps of: 1, scanning known rock debris to obtain typical multi-source data, performing nonlinear dimensionality reduction fusion to obtain typical low-dimensional feature data, and establishing a typical rock debris sample feature database; 2, the while-drilling logging rock debris is scanned to obtain real-time multi-source data; a third step of performing nonlinear dimension reduction fusion on the real-time multi-source data to obtain real-time low-dimensional feature data; 4, classifying the real-time low-dimensional feature data in combination with a typical rock debris sample database, and establishing an accurate lithologic columnar section; 5, predicting an initial lithologic profile; sixthly, the initial lithologic section is calibrated in real time through the accurate lithologic columnar section, and a final lithologic section is obtained. According to the method, the real-time multi-source data is obtained in real time, the identification result is more accurate, the multiplicity of solutions is reduced, and the lithologic section predicted before drilling is more accurate.

This invention provides a PDC single-tooth rock-breaking experimental device and a method for analyzing the rock-breaking mechanism. The experimental device includes a rock-breaking device body, a PDC tooth cutting depth adjustment mechanism, a cutting speed adjustment mechanism, and a cutting force measurement mechanism. The cutting speed adjustment mechanism can adjust the cutting speed of the rock sample; the rock-breaking device body is used to fix and install the cutting depth adjustment mechanism; the cutting depth adjustment mechanism can clamp the PDC tooth and precisely control its inclination angle and cutting depth; the cutting force measurement mechanism can monitor the cutting force on the rock sample. The method includes the following steps: setting parameters such as cutting depth, cutting speed, and inclination angle; monitoring the cutting force and recording the dynamic rock crushing process; sieving and collecting rock fragments, determining the mass fraction of different groups of rock fragments, and preliminarily determining the ductile-brittle crushing mode of the rock based on the distribution pattern of the rock fragments. This invention has the advantages of precisely controlling the cutting depth, PDC tooth inclination angle, and cutting speed.

The utility model provides a rock debris sampler for geological prospecting, and relates to the field of geological prospecting, the rock debris sampler comprises a sampler body, the sampler body is movably sleeved with a connecting sleeve, the connecting sleeve is fixedly sleeved with a fixing ring, and the surface of the fixing ring is fixedly connected with eight fixing plates; a supporting shaft is rotationally connected between every two adjacent fixing plates, the supporting shafts are fixedly sleeved with supporting legs, and torsional springs are fixedly connected between the supporting legs and the fixing plates. Through cooperation of the supporting legs, the fixed rings, the sliding rings, the first connecting pieces, the second connecting pieces, the transverse plates and other structures, a plurality of triangular stabilizing units are formed together, loads such as vibration and impact generated when the sampler works are converted into tension and compression stress in the transverse plates from concentrated stress at the joints of the supporting legs, and the stability of the sampler is improved. Therefore, the stress concentration phenomenon of connecting points of the supporting legs is effectively avoided, and the risk of fatigue fracture of welding points is effectively reduced.

The application discloses a kind of paragenetic metamorphic rock weathering crust weathering alteration index calculation method, comprising: the mass percentage of element of mud logging cuttings is determined;The mass percentage of element is normalized;The mass percentage of element after normalization is converted into oxide molar ratio;According to the change trend of element oxide molar ratio, the relative loss and relative enrichment trend of various elements in paragenetic metamorphic rock weathering crust is judged;According to the trend of element relative loss or enrichment, the easily soluble element and the element easy to remain are determined, and the new paragenetic metamorphic rock weathering crust weathering alteration index calculation formula is fitted;The molar ratio of element oxide is brought into the new calculation formula established, according to the size of the weathering alteration index value calculated, paragenetic metamorphic rock weathering crust is identified, and paragenetic metamorphic rock weathering crust structure is divided.The application provides important technical support for oil and gas basin paragenetic metamorphic rock weathering crust reservoir research.

The invention relates to the technical field of unconventional resource development, in particular to a method and a device for determining lithology space-time distribution characteristics of coal measure gas, and the corresponding method comprises the following steps: building a sequence stratigraphic framework of a target work area according to rock debris logging data and logging data of the target work area; determining dominant storage lithology corresponding to each coal series gas; according to the sequence stratigraphic framework and the advantage storage lithology corresponding to each type of coal measure gas, establishing a well connection section and a lithology plane graph; and according to the well connection profile and the lithologic plan, determining the lithologic spatial-temporal distribution characteristics of the coal-series gas. The effective determination method of the lithology space-time distribution rule is formed on the basis of combination of the sequence strata, the rock core and the logging, rock core constraint, logging lithology correction and high-precision sequence strata isochronous framework constraint, and then the lithology space-time distribution rule of coal bed gas, coal series shale gas and coal series tight sandstone gas evaluation is determined.

The present application relates to a kind of lithology identification technical field, it is a kind of lithology identification method, device and electronic equipment based on cutting fluorescence image and Raman spectrum fusion, including corresponding cutting sample is non-petroleum hydrocarbon fluorescence cutting fluorescence image, application Gaussian weighting method dynamic segmentation fluorescence area, obtain high, medium, low fluorescence intensity area image and no fluorescence area image, and determine the gray value range of each area image and fluorescence area proportion, and bring into mineral type discrimination rule and match, obtain corresponding mineral species and mineral content;Again with lithology identification rule and match, obtain corresponding lithology identification result.The present application can be without any experimental instrument in the lithology identification, directly through the gray value range of reaction fluorescence intensity, combined with the mapping relationship of established fluorescence intensity and mineral composition directly obtain mineral species and mineral content, both can effectively save drilling cost, and quickly, accurately identify lithology.

The present application belongs to the technical field of oil exploration, and discloses a method for evaluating the development degree of sand-mudstone reservoir-cap assemblage, which specifically comprises the following steps: conducting regional data analysis for a study area, and mastering the core / cuttings data, logging data and oil testing and production testing data of drilled wells, as well as the seismic data and seismic interpretation horizon data of the whole work area; conducting pre-stack deterministic inversion based on Zeoppritz equation to obtain the data body of the ratio of P-wave velocity to S-wave velocity in the work area; extracting the numerical value of the ratio of P-wave velocity to S-wave velocity along the sandstone layer interpreted by the seismic data to obtain the plan view of the sandstone reservoir; extracting the numerical value of the ratio of P-wave velocity to S-wave velocity along the mudstone layer interpreted by the seismic data to obtain the plan view of the mudstone cap rock; quantifying the relative development degree of the reservoir-cap assemblage by a development degree index calculation formula, constructing the plan view of the development degree index of the sand-mudstone reservoir-cap assemblage, and quantitatively dividing the development degree of the reservoir-cap assemblage. The present application can clearly define the development range of high-quality reservoir-cap assemblage, delineate the favorable exploration area, and further guide the well site deployment of exploration wells.

The invention relates to the technical field of low-permeability compact oil and gas field development, in particular to a variable-sequence fracturing method and device for improving the complexity of fractures between horizontal well sections. The method comprises the steps that a block variable-sequence fracturing model is constructed based on target horizontal well drilling cuttings logging response characteristics, target block coring rock mechanical parameters, target block ground stress parameters and target block construction data; based on the block variable-sequence fracturing model, determining a variable-sequence fracturing depth section of a reservoir along the path of a target horizontal well shaft; a target horizontal well variable-sequence fracturing scheme is determined by combining the target horizontal well construction process conditions and the target horizontal well shaft along-way reservoir variable-sequence fracturing section depth; and on the basis of the target horizontal well variable-sequence fracturing scheme, variable-sequence fracturing is conducted on the target horizontal well. The method is suitable for field requirements of staged fracturing transformation of various oil and gas reservoir horizontal wells, the adaptability to various lithologic reservoirs such as sandstone, carbonate rock and limestone is high, and the technical application range is wide.

This invention belongs to the field of natural gas extraction technology in deep thin coal and rock formations. It discloses a directional anti-sticking drill string assembly and drilling method for horizontal wells in deep thin coal and rock formations. A closed-loop control system is formed between the drill bit trajectory control mechanism and the wellbore dressing and anti-sticking mechanism, encompassing near-bit high-precision sensing, real-time data transmission while drilling, surface analysis feedback control, active downhole directional correction, and synchronous wellbore dressing and protection. Multi-directional gamma sensors positioned near the drill bit provide high-resolution formation information; the bend structure of the downhole power drill string provides the direction of the wellbore trajectory; the non-magnetic bearing section ensures the stability of measurement while drilling and the reliability of communication; the surface control unit enables real-time decision-making and trajectory correction; and the wellbore dressing and anti-sticking mechanism simultaneously improves wellbore stability and cuttings carrying capacity. This significantly enhances the drilling throughput and resistance to coal seam collapse in complex sections of thin coal and rock formations while ensuring trajectory controllability, reducing the risk of sticking due to wellbore instability and cuttings accumulation.

The invention belongs to the technical field of sandstone type uranium ore geological drilling, and particularly relates to a compact mudstone stratum coring bit suitable for sandstone type uranium ore geological drilling. According to the drill bit, the inner cutting teeth and the outer cutting teeth are arranged in a staggered mode, the top ends of the inner cutting teeth and the outer cutting teeth are located at different heights and are arranged in a stepped mode, so that in the rotating process of the drill bit, the high-position cutting teeth firstly make contact with a stratum for cutting to form a broken free face, and the low-position cutting teeth further cut to expand the formed cutting free face; a stratum cutting free surface is enlarged compared with a drill bit in the prior art, so that the effect of improving the drilling efficiency is achieved. In addition, the water gaps are evenly distributed close to the cutting teeth, and cut rock debris is removed in time.

The utility model relates to the technical field of rock debris sampling, especially to a bucket type rock debris sampling device. The bucket type rock debris sampling device is arranged on a slurry tank for receiving rock debris slurry, and a mounting frame group for fixing the sampling device is arranged on the slurry tank. The sampling device comprises a shell and a conveying mechanism arranged in the shell. A plurality of groups of material taking mechanisms are arranged on the conveying mechanism at equal intervals. A discharge hopper for receiving samples is arranged on the shell. The bucket type rock debris sampling device provided by the utility model realizes the automation and continuous sampling function of rock debris sampling. The samples taken are more representative. The conveying mechanism is driven by a motor to automatically complete the whole process of rock debris digging, lifting and pouring, greatly reducing the labor intensity and avoiding sample confusion caused by human factors, and providing more reliable analysis basis for geological personnel.

The invention discloses a high-pressure water jet drilling method and nozzle based on authigenic abrasives, and relates to the field of geological drilling equipment.The nozzle of a double-layer structure comprises a nozzle inner sleeve and a nozzle outer sleeve which are coaxially arranged together in a sleeved mode, at least one sand suction hole is formed in the side wall of the nozzle outer sleeve, and the front end of the nozzle inner sleeve is located in the nozzle outer sleeve; a confluence area is formed at the outlet of the nozzle jacket; the sand suction holes are communicated with the confluence area to generate a siphonic effect, external rock debris is sucked into the confluence area and mixed with a high-speed water column, and then the rock debris is accelerated to form high-speed abrasive water jet to impact the rock surface. Abrasive water jet is formed by self-generated rock debris of the drill bit, mechanical, hydraulic and abrasive triple rock breaking is achieved by combining rotation of the drill teeth, and the drilling speed and the rock breaking efficiency are greatly improved; the double-layer structure nozzle modular design is adopted, the structure is compact, assembling and maintaining are rapid and convenient, ground complex abrasive adding equipment is not needed, local materials are used, and zero-cost abrasive supply is achieved.

The invention relates to the technical field of geological drilling, and discloses an intelligent geological drilling control system and method based on real-time rock debris analysis, and the system comprises a data collection module which is used for obtaining all feature data of screened rock debris and real-time drilling data, a preprocessing module which is used for preprocessing all the obtained feature data, and a data analysis module which is used for analyzing the real-time drilling data. Analysis is carried out according to the preprocessed feature data of the screened rock debris and real-time drilling data, and a drilling strategy is intelligently generated according to an analysis result; the drilling strategy generated by the data analysis module is transmitted to the execution module based on 5G communication; and the execution module is used for executing the drilling strategy generated by the data analysis module. Rock debris multi-dimensional characteristic data in the drilling process and real-time data such as ground stress and fluid activity around a drill hole are collected, interference is eliminated through a preprocessing module, the format is unified, and then a first drilling index and a second drilling index are obtained through a data analysis module.

The invention provides a control method and device for a drilling and pole erecting all-in-one machine. The method comprises the steps that the target drilling depth and the pole erecting perpendicularity are set, and a mechanism is started; geological state data and mechanical operation data such as drill rod torque, rotating speed, feeding pressure and rock debris conveying rate are collected in real time; the drilling depth control stability is judged, and an unstable process is triggered when the drilling depth is unstable; in the process, the torque fluctuation frequency and the rock debris conveying abnormal fluctuation are cooperatively analyzed to obtain the geological suitability grade; analyzing the frequency spectrum evolution trend of the vibration signal based on the grade so as to evaluate the mechanical resonance stability; and in combination with the geological suitability grade and the resonance stability, the feeding rate and the lifting speed are dynamically adjusted by adopting fuzzy reasoning, a stable working condition parameter combination is formed, a parameter migration knowledge base is constructed, and a similar parameter template is subsequently matched to generate a cooperative control instruction. According to the technical scheme, self-adaptive parameter migration is realized, and the operation stability and safety are improved.

The invention relates to the technical field of lithology identification, in particular to a lithology identification method and device based on fusion of a rock debris fluorescence image and a Raman spectrum, and electronic equipment. The lithology identification method comprises the following steps: dynamically segmenting a fluorescence region by applying a Gaussian weighting method according to a rock debris fluorescence image of which a corresponding rock debris sample is non-petroleum hydrocarbon fluorescence; obtaining high, medium and low fluorescence intensity area images and non-fluorescence area images, determining gray value ranges and fluorescence area proportions of the area images, and substituting the gray value ranges and the fluorescence area proportions into mineral type judgment rules for matching to obtain corresponding mineral types and mineral contents; and matching with the lithology identification rule to obtain a corresponding lithology identification result. According to the lithology identification method, the participation of any experimental apparatus is not needed during lithology identification, the mineral type and the mineral content are directly obtained by directly reflecting the gray value range of the fluorescence intensity and combining the established mapping relation between the fluorescence intensity and the mineral components, the drilling cost can be effectively saved, and the lithology can be rapidly and accurately identified.

The invention provides a neonatology gypsum salt rock prediction and salt bottom layer blocking method, and relates to the technical field of petroleum drilling exploration, and the method comprises the steps: predicting the top, bottom and thickness of a gypsum salt rock layer for a target region based on seismic data, drilling time and rock debris logging data, and obtaining a preliminary prediction result; predicting the top, bottom and thickness of the gypsum salt rock stratum of the target area through the element logging data to obtain an element logging prediction result; and the preliminary prediction result and the element logging prediction result are integrated, the gypsum salt rock thickness and the salt bottom of the target area are predicted, and layer blocking is achieved. The method is suitable for predicting the thickness and the top and the bottom of the gypsum salt rock formed by continental deposition of a neonatology ancient-recent line, on the basis of seismic data processing and interpretation and rock debris logging data during drilling, element logging data is combined, gypsum salt rock thickness prediction and salt bottom layer blocking are carried out, the layer blocking prediction accuracy is improved, the gypsum salt rock drilling risk is reduced, and the drilling cost is reduced. The drilling cost and period are saved, field requirements are met, and the method has important application value in the aspect of drilling engineering.

The application discloses a lithology identification method and system applied to oil drilling, wherein the method steps comprise the following: collecting geophysical data in a work site before the drilling process; preprocessing the geophysical data to obtain processed data; performing feature extraction on the processed data to obtain a training set and a test set; constructing a lithology classification model by using the training set and the test set; completing lithology prediction before the oil drilling process by using the lithology classification model to obtain a prediction result; drilling based on the prediction result; collecting rock size data and rock debris data during the drilling process; and completing lithology identification based on the rock size data and the rock debris data. The application adopts multiple geophysical data, comprehensively applies data processing and artificial intelligence algorithms for analysis and processing, can more accurately distinguish and distinguish geological lithology, effectively improves the efficiency and accuracy of lithology identification, and has wide application prospect and economic value.

The invention relates to an air reverse circulation rock sample conical divider and a method thereof. The divider comprises an upper rotational flow cylinder assembly, an upper gate assembly, a middle sample storage device assembly, a lower gate assembly and a lower division sampler assembly which are sequentially and hermetically connected from top to bottom. The upper rotational flow cylinder assembly achieves efficient gas-solid separation through a tangential inlet and an internal rotational flow structure. The lower division sampler assembly is provided with a rotatable conical cylinder and a proportion-adjustable division disc, so that uniform dispersion and accurate proportion division can be realized. Opening and closing of the upper gate and the lower gate are sequentially controlled in the drilling process, continuous and automatic collection and division of rock debris are achieved, the problems that in a traditional method, samples are polluted, sample division is uneven, and efficiency is low are effectively solved, and the device is particularly suitable for on-site rapid sampling operation of field geological exploration.

This invention discloses a geological experimental pretreatment method for PDC drill cuttings, comprising: cleaning the acquired cuttings sample; identifying and removing false cuttings such as fragments and solidified mud particles by quantifying and judging the physical and visual characteristics of the cuttings based on preset identification rules, ensuring the authenticity of the sample; performing refined lithological classification on the remaining true cuttings based on classification rules, such as distinguishing between carbonate rocks and clastic rocks; and selectively identifying target cuttings from the classified true cuttings according to the specific geological experimental purpose. This invention establishes a standardized processing procedure that can significantly improve the purity and stratigraphic representativeness of cuttings samples, thereby ensuring the accuracy and reliability of subsequent geological experimental analysis data.

The invention relates to the technical field of oil exploration, in particular to a three-dimensional quantitative fluorescent logging method which comprises the following steps: acquiring and preprocessing solid samples (well wall coring, well drilling coring and rock debris) and liquid samples (drilling fluid additives and drilling fluid), and acquiring fluorescence data after mathematical statistics; and combining the fluorescence data to calculate the oil concentration and the contrast level, judging the property of the crude oil and calculating the oiliness index, finally identifying the property of the reservoir fluid according to the oiliness index and the contrast level parameter, and determining whether the reservoir fluid is a gas layer, an oil layer, a same oil-water layer, a water layer or a dry layer by means of a two-dimensional interpretation chart and the like. According to the invention, the technical effect of effectively and accurately identifying the reservoir fluid properties in geological exploration is achieved.

This invention relates to the field of oil and gas exploration technology and discloses an automatic identification method for drilling cuttings lithology. The method includes: acquiring drilling cuttings images collected from different well areas; preprocessing the drilling cuttings images to obtain target images that meet preset requirements; using a deep learning model to identify the target images and segment them into multiple individual cuttings images; extracting features from the individual cuttings images based on a neural network algorithm; classifying and labeling rock types in the feature space based on the extracted features using the KNN algorithm to establish an automatic identification model for drilling cuttings lithology; and using the automatic identification model to identify the target drilling cuttings. The automatic identification method for drilling cuttings lithology disclosed in this invention is simple to operate, has high identification efficiency, accurate lithology identification, and a wide range of applications.

The invention discloses a rock mechanical parameter determination method and device, electronic equipment and a storage medium. The method comprises the following steps: collecting a shale horizontal well rock debris sample, and carrying out rock debris longitudinal and transverse wave velocity measurement on the shale horizontal well rock debris sample to obtain a shale horizontal well rock debris longitudinal and transverse wave time difference; a rock debris longitudinal and transverse wave time difference weak medium correction relation is obtained, the shale horizontal well rock debris longitudinal and transverse wave time difference is corrected through the rock debris longitudinal and transverse wave time difference weak medium correction relation, and the corrected shale horizontal well rock debris longitudinal and transverse wave time difference is obtained; shale horizontal well element logging is obtained, the mineral content of the shale horizontal well is calculated through the shale horizontal well element logging, and the stratum density of the shale horizontal well is obtained; and calculating the rock mechanical parameters of the shale horizontal well by using the corrected longitudinal and transverse wave time difference of the shale horizontal well rock debris and the stratum density of the shale horizontal well. According to the scheme, the rock mechanical parameters of the shale horizontal well can be obtained, and technical support is provided for horizontal well fracturing design.

The invention belongs to the field of geological exploration and development, and discloses a primary barium or strontium isotope and content determination method of barite mud rock debris. Comprising the following steps: carrying out classification and grading pretreatment on samples, carrying out barium or strontium element detection on the three types of samples, analyzing and calculating the content of the barium or strontium element based on isotope concentration, detecting a result of a sample stripping method and determining a final result. According to the method, through specific sample pretreatment, isotope concentration calculation, stripping inspection and other method processes, the problem that barite mud well rock debris cannot be used for obtaining the isotope and content parameters of the paleo-environment trace element index barium or strontium element of the native stratum is solved; a practical and effective method and template are provided for how to realize experimental analysis-level pollutant treatment under similar mud pollution conditions, how to utilize sensitive conventional test parameters and how to accurately obtain original stratum trace element information. The method is easy to operate and low in economic cost, and the correctness of the result can be effectively guaranteed through the self-checking link.

The invention discloses a rock debris homing method, device and equipment and a storage medium, and relates to the technical field of oil-gas exploration, and the method comprises the steps: collecting logging data of other wells in a preset range of a target well, so as to obtain lithology data of different lithology layers, and obtaining lithology and GR data of adjacent wells; calculating an average GR value of different lithology based on the adjacent well lithology data and the adjacent well GR data; simulating a GR curve based on the measured lithology data of the target rock debris section and the average GR value; dividing the target rock debris section to obtain a plurality of small layer sections, and calculating the difference between the measured GR curve and the simulated GR curve corresponding to each small layer section under different variable offsets and a plurality of thickness expansion and contraction proportion variables corresponding to different lithologic sections; and homing the lithologic interface of the small layer section and the layer thickness of each lithologic small layer in the small layer section based on the offset and the thickness expansion ratio corresponding to the optimal value in all the difference values. According to the method, automatic rock debris depth homing can be achieved, homing efficiency is improved, and labor cost is saved.

The invention discloses a method for extracting calcareous microfossils of consolidated sediments, which comprises the following steps: S1, taking a rock core sample or a rock debris sample of the consolidated sediments, cleaning the surface of the rock core sample or the rock debris sample, and crushing the rock core sample or the rock debris sample to obtain a debris sample; s2, weighing a chipping sample, soaking the chipping sample in water, heating the chipping sample, and then freezing the chipping sample to obtain a frozen sample; s3, hydrogen peroxide is added into the frozen sample and mixed, then sieving and cleaning are conducted, and first particles are obtained; adding a weakly alkaline reagent and heating to obtain a first mixture; s4, adding an anti-flocculating agent into the first mixture, mixing, and carrying out ultrasonic treatment to obtain a second mixture; and then sieving, cleaning, drying and collecting a particle sample. According to the method, more calcareous microfossils are physically separated out, chips adhering to the surfaces of the calcareous microfossils fall off, chemical decomposition of the fossils and adhering particles is promoted, meanwhile, preservation of fossil shells is facilitated, and fine particles are prevented from being flocculated and precipitated.

The application provides a drilling and sampling device and method for breaking limestone strata. The sampling device comprises a drill rod joint, a blocking ball, a core barrel and a drill bit. The drill rod joint comprises an upper drill rod connecting part and a lower core barrel connecting part. A drilling fluid conversion cavity is arranged in the core barrel connecting part. A drilling fluid circulation port is arranged on the core barrel top cover. First and second drilling fluid circulation channels are arranged on the side walls of the core barrel and the drill bit respectively. Each drilling fluid circulation channel is communicated with the drilling fluid conversion cavity. When the blocking ball is arranged at the drilling fluid circulation port, the drilling fluid is circulated through the first and second drilling fluid circulation channels. When the blocking ball is removed, the drilling fluid is circulated normally through the core barrel. The application can realize the local function of the drilling fluid hole bottom, ensure that the cuttings are not accumulated at the hole bottom, and improve the drilling efficiency of the broken limestone strata. Meanwhile, the device can realize two drilling fluid circulation paths, and avoids the complexity of carrying multiple drilling tools by the survey drilling machine.