263 results about "Well engineering" patented technology

The invention relates to a preparation method and application of a composite leakage-proof agent while drilling, and belongs to the technical field of petroleum drilling engineering. The composite leakage-proof agent while drilling is prepared from the following components in percentage by mass: 20-45% of nano composite particles, 15-35% of a multi-stage fiber reinforced network material, 10-20% of an intelligent response blocking agent, 5-10% of a high-temperature-resistant additive, 1-5% of a dispersing agent and the balance of deionized water, wherein the sum of the contents of all the components is 100%. According to the composite leak-proof agent while drilling provided by the invention, the temperature-sensitive resin with a core-shell structure is introduced, so that a three-dimensional synergistic mechanism of nano-composite particle filling-multistage fiber network bridging-intelligent response curing is realized, and efficient and environment-friendly plugging of an ultrahigh-temperature and high-pressure stratum is realized. The success rate of one-time plugging is increased from 45% to 92%, the average operation time is shortened by 60%, and an efficient solution is provided for deep and ultra-deep drilling.

The invention relates to an intelligent inversion method and system for well drilling overflow shaft gas distribution based on a self-encoder, and belongs to the technical field of oil gas and geothermal development drilling and completion engineering. Comprising the following steps: step 1, accurately solving multiphase flow parameters of a shaft; 2, in combination with the drilling working condition and the geological condition of a specific overflow high-risk well section, based on a Monte Carlo sampling method, eight parameters are changed, uniform sampling is carried out, and a high-precision simulation data set is formed; step 3, constructing a neural network model for gas cut state inversion based on an auto-encoder neural network; 4, training is carried out; 5, standardizing one-dimensional time sequence parameters in the monitoring data; and inputting into a trained neural network model for gas cut state inversion based on an auto-encoder neural network to obtain distribution data of the overflow gas in the shaft in a time period in which the time sequence parameter at the current moment is located. According to the invention, the real-time rapid inversion of the gas distribution in the parallel cylinder during the drilling overflow parallel control period is realized.

The invention is suitable for the technical field of petroleum drilling engineering, and provides a drilling overflow early recognition method based on self-supervised learning, which comprises the following steps: constructing drilling multidimensional parameters into a time sequence sample by using a sliding time window, and inputting the time sequence sample into a multi-branch consistency constraint twinning network (MCSiam); the MCSiam firstly performs data enhancement on a sample, then extracts a local spatial-temporal feature and a long-term dependency relationship through an encoder composed of CNN-LSTM, and performs multi-branch comparative learning, consistency constraint optimization and predictor prediction and model optimization, and the finally trained model is used for early recognition of drilling overflow. The MCSiam is superior to a traditional method and other deep learning models in performance indexes such as accuracy, the calculation complexity is low, the applicability is wide, overflow early recognition is achieved, efficient and reliable technical support is provided for petroleum drilling safety and well control safety, and the method has good practicability and innovativeness in the field of drilling overflow early recognition.

The invention relates to the technical field of petroleum drilling engineering, and particularly discloses an analysis and prediction system based on petroleum drilling and production data, which realizes virtual reconstruction of a physical drilling system by constructing a digital mapping body, and adopts a multi-source sensor network to collect drill string vortex frequency and wellbore temperature field gradient data. Forming a time sequence feature set through time sequence alignment and fusion processing; performing differential transformation and modal decomposition on the feature set to extract transient response feature vectors and generate a risk distribution diagram; establishing a parameter-risk correlation model, and decoupling mechanical vibration and thermal stress interference by solving a physical equation to obtain a dynamic risk index; the risk indexes and the process parameters are mapped to a three-dimensional grid to construct a multi-dimensional feature space, a feature fusion grid is adopted to achieve information aggregation and reconstruction, and comprehensive risk assessment indexes are generated; a dynamic early warning threshold value is established according to the evaluation indexes, and drilling parameters are optimized in real time through closed-loop control.

The invention is applicable to the technical field of petroleum drilling engineering, and provides a drilling overflow early recognition method based on deep reinforcement learning, which comprises the following steps of: firstly, collecting and preprocessing data, and then constructing and optimizing a drilling overflow early recognition model based on a near-end strategy optimization (PPO) algorithm, and finally, collecting data in real time in drilling operation, preprocessing the data, inputting the data into the model, analyzing the change of the characteristic quantity according to a PPO algorithm, judging whether an overflow sign exists according to an overflow drilling process flow, and if so, early warning according to a Reward function strategy. According to the method, a traditional threshold value method and machine learning are combined, a deep reinforcement learning algorithm is used for optimizing drilling parameter threshold values, characteristic quantity is monitored in real time to capture changes before overflow, historical data are self-learned to recognize an overflow mode, and dependence on field operators is reduced; meanwhile, model decision logic is displayed, understanding and trust of engineers are enhanced, more reliable overflow monitoring guarantee is provided for drilling operation, accident risks are reduced, and wellbore safety is guaranteed.

The invention belongs to the field of petroleum and natural gas drilling engineering, and particularly relates to an ocean fine pressure control drilling inspection device and method. A wellhead monitoring device is used for monitoring locking information of a hoop of an annular blowout preventer; the drill floor monitoring device is used for monitoring the coupling information of the drilling tool; the gas cut monitoring device is used for monitoring gas cut information in the well pipe; the pressure monitoring and automatic control system state monitoring device is used for monitoring valve information of the wellhead device; and the remote control center is used for receiving information sent by the wellhead monitoring device, the drill floor monitoring device, the gas cut monitoring device and the pressure monitoring and automatic control system state monitoring device. According to the invention, state monitoring of different processes such as a drill floor surface, a well mouth, a gas cut state, pressure monitoring and an automatic control system is realized, information interaction with a fine pressure control well drilling control center can be realized, whole-process monitoring of an equipment operation process is guaranteed, safety of a fine pressure control well drilling operation process is guaranteed, and labor force is saved.

The invention belongs to the technical field of petroleum and natural gas drilling engineering, and particularly relates to a borehole friction coefficient segmented inversion method based on a genetic algorithm and string mechanics, which comprises the following steps of: acquiring specified data of a construction well, dividing a borehole of the construction well to be predicted into well sections with fixed lengths, defining depth ranges of the well sections, and setting a global search range of a friction coefficient; initializing the population size, the maximum number of iterations, the selection probability, the crossover probability and the mutation probability of the genetic algorithm, and performing downward inversion section by section from a wellhead section: initializing a candidate friction coefficient population of a current well section, setting a sectional friction coefficient, calculating a hook load at the tail of the current section, and calculating the maximum number of iterations; iterative optimization is carried out until a termination condition is met, and then the optimal friction coefficient of the section is output and fixed; and iteratively executing until inversion of all well sections is completed, outputting a full-borehole segmented friction coefficient profile, and realizing intelligent segmented inversion of the borehole friction coefficient by combining a tubular column mechanical model and a genetic algorithm, so that the prediction precision of the friction coefficient is improved, and the well drilling design and construction are optimized.

The invention discloses a reamer electromechanical driving mechanism and method capable of detecting the position state of a blade, and relates to the technical field of tools of petroleum drilling engineering, the reamer electromechanical driving mechanism comprises a power assembly, a lead screw assembly, an ejector rod, a locking assembly, a rotation detector and a displacement detector which are mounted in a drill collar; the power assembly is connected with the lead screw assembly, the lead screw assembly is connected with the ejector rod, the ejector rod is connected with the reamer blade, the power assembly rotates and drives the ejector rod to move up and down through the lead screw assembly, and the ejector rod moves up and down to drive the reamer blade to be unfolded or folded. The locking assembly is assembled on the ejector rod, and after the reamer blade is unfolded in place, mechanical self-locking is conducted on the ejector rod. The rotation detector is assembled beside the lead screw assembly to detect rotation of the lead screw assembly, and the displacement detector is assembled beside the ejector rod to detect up-and-down movement of the ejector rod. The opening and closing state of the cutter wing is measured and uploaded through the rotating detector and the displacement detector, the cutter wing is expanded in place, the underground condition can be judged easily, and controllable multiple reaming is achieved.

The invention discloses a vertical shaft duct piece splicing device and a construction method thereof, and belongs to the technical field of vertical shaft engineering construction.The vertical shaft duct piece splicing device comprises a moving trolley, an overturning assembly, a clamping mechanism and a lifting mechanism, a support of the overturning assembly is vertically arranged on the moving trolley, and an overturning plate is rotationally connected to the support and provided with two guide columns; the overturning oil cylinder is used for driving the overturning plate to be switched between the horizontal state and the vertical state. A base of the clamping mechanism is provided with two guide holes for two guide columns to penetrate through, a clamping piece is rotationally arranged in a rotating groove of the base, an elastic piece is installed in the rotating groove and connected with the clamping piece, and when a duct piece is placed on a turnover plate in a horizontal state, the clamping piece can be pushed to be rotationally inserted into a hanging hole of the duct piece, and the elastic piece is stretched. The lifting mechanism is arranged on the overturning plate and can drive the base to drive the clamping piece to vertically move downwards. The vertical shaft duct piece splicing construction method adopts the vertical shaft duct piece splicing device. The device is high in stability, high in assembly precision and low in safety risk.

The invention discloses an oil-gas well high-pressure test automatic oil supply lubrication anti-leakage pollution device, and belongs to the technical field of oil-gas well logging engineering. According to the technical scheme, a lubricating section body used for supplying oil to a cable for lubrication is connected with a pressure guiding and drainage section body; the blowout prevention flow choking part is connected with the pressure guide and drainage section main body; a liquid gathering drainage cup is arranged between the blowout prevention flow choking part and the pressure guide drainage section main body; and the liquid receiving disc is connected with the lubricating section main body. The beneficial effects are that oil is automatically supplied for lubrication, and the problem of pollution caused by overflow and accumulation of lubricating grease manually coated on the cable surface is solved; liquid accumulated in the liquid gathering drainage cup naturally releases pressure in the inverted liquid gathering drainage cup, then freely falls into a liquid receiving plate and enters a ground recycling bin along a pipeline; the problems of pollution and high-pressure damage caused by leakage of the anti-spraying head during high-pressure testing are solved; the safety performance is good, the flow choking sealing filler adopts the polyurethane annular packing, the high-pressure performance is high, the elasticity is good, the sealing performance is high, high-pressure sealing can be effectively dealt with, and harm caused by high-pressure leakage can be prevented.

The invention relates to an underground HPHT area identification method and device, and belongs to the technical field of petroleum drilling engineering.The method comprises the steps that an initial temperature predicted value is calculated based on a temperature physical model, and an initial pressure predicted value is calculated based on a pressure physical model; extracting time sequence characteristic data and static characteristic data from the initial temperature prediction value, the initial pressure prediction value and the drilling data; respectively inputting the time sequence characteristic data and the static characteristic data into two base models of a completely trained integrated learning model to obtain a temperature compensation value and a pressure compensation value; and obtaining a final temperature prediction value based on the initial temperature prediction value and the temperature compensation value, obtaining a final pressure prediction value based on the initial pressure prediction value and the pressure compensation value, and identifying the HPHT region based on the final temperature prediction value and the final pressure prediction value. According to the method, the prior knowledge of the physical model and the learning ability of the integrated learning model are combined, and the prediction precision of the temperature and the pressure under the complex geological condition is effectively improved.

The invention discloses a disassembly-free top drive drilling device pulley and guide rail system, relates to the field of petroleum drilling engineering, and solves the problems that a top drive drilling device is too long in assembly and disassembly time and too high in safety risk when applied to a telescopic derrick drilling machine. The derrick is divided into an upper derrick section and a lower derrick section; the slide rail comprises an upper slide rail section and a lower slide rail section; the upper-section sliding rail and the lower-section sliding rail are hooked through a hook; an upper-section sliding rail and a lower-section sliding rail are respectively arranged on two sides of the inner sides of the derrick upper section and the derrick lower section; two ends of the pulley are in contact with the upper-section slide rail and the lower-section slide rail; the working surfaces of the upper-section sliding rail and the lower-section sliding rail in contact with the tackle are on the same plane to form a tackle guide channel; the middle of the pulley is connected with a top drive; the top drive is hung below the traveling block and moves up and down along with the traveling block. According to the disassembly-free top drive well drilling device pulley and guide rail system, the assembly and disassembly time is saved, the danger in the assembly and disassembly process is reduced, and the well drilling efficiency and the construction quality are improved.

The invention relates to the technical field of petroleum drilling engineering, and particularly discloses a drilling plugging agent as well as a preparation method and application thereof. According to the plugging agent, nano silicon dioxide and graphene oxide serve as a composite matrix, and the well drilling plugging agent with excellent dispersion stability, compact plugging performance, temperature resistance, salt resistance and reservoir friendliness is obtained through silane coupling agent graft modification and polymer copolymerization composite modification. The technical defects that an existing nano plugging agent is prone to agglomeration, poor in compatibility with drilling fluid, insufficient in extreme working condition resistance and the like are overcome, the preparation process is simple and controllable, the cost is relatively low, the plugging agent can be added into water-based or oil-based drilling fluid according to the mass ratio of 0.5-5%, the plugging agent is suitable for shale, deep high-temperature high-pressure high-salt complex stratums and the like, a compact plugging layer can be formed, and the plugging effect is good. Shale micro-cracks and deep stratum large cracks are effectively blocked, and the problems that a traditional blocking agent is prone to agglomeration, poor in extreme working condition resistance and the like are solved.

The invention discloses a high-temperature well cementation cement expanding agent and a preparation method thereof, and belongs to the technical field of oil-gas well engineering well cementation materials. The high-temperature well cementation cement expanding agent is prepared from the following raw materials in parts by weight: 30-40 parts of dolomite; 10 to 20 parts of serpentine; 5 to 10 parts of hedenbergite; 5 to 10 parts of scolecite; 25-35 parts of slaked lime powder; 5-10 parts of quartz powder; the high-temperature well cementation cement expanding agent comprises the following chemical components in percentage by weight: more than 13wt.% and less than 23wt.% of MgO, more than 38wt.% and less than 55wt.% of CaO, more than 18wt.% and less than 32wt.% of SiO2, less than 3.5 wt.% of Al2O3 and less than 1wt.% of Fe2O3. The particle sizes of the high-temperature well cementation cement expanding agent are as follows: Dx (10) is less than or equal to 4 microns, Dx (50) is less than or equal to 10 microns, and Dx (90) is less than or equal to 20 microns. The invention also discloses a preparation method of the high-temperature well cementation cement expanding agent. Starting from cement main body minerals, through lattice solid solution, core-shell structure wrapping and other means, an expansion component and the hydration process of cement can achieve a synergistic reaction, and therefore the effective expansion effect is achieved in the cement gelling structure forming process.

The invention relates to a deep-water under-salt drilling wellbore pressure fine regulation and control system and method, and belongs to the technical field of oil and gas development drilling and completion engineering. The system comprises a wellbore inlet which is sequentially connected with an inlet displacement meter, a drilling fluid pump and a drilling fluid tank outwards, and a wellhead outlet is sequentially connected with a wellbore pressure regulation and control device, a slurry pump, an outlet flow meter and a slurry pool; the inlet displacement meter, the outlet displacement meter and the shaft pressure regulation and control device are all connected to the fine pressure control drilling system, the safety equivalent drilling fluid density of salt bed open hole sections of different depths can be obtained by accurately calculating the shaft temperature field and the equivalent circulation density and considering the influence of rock stratum creep characteristics on the drilling fluid density and the creep diameter shrinkage rate, and the drilling fluid density of the salt bed open hole sections of different depths can be obtained. And the wellhead return pressure is adjusted in real time, so that the precise regulation and control of the wellbore pressure are realized.

The invention provides a well bottom ECD accurate determination method based on a field multi-point cycle test, and belongs to the technical field of petroleum and natural gas drilling engineering. Comprising the following steps: selecting at least three different-depth test points on a casing section, and synchronously obtaining pump pressure, drilling fluid rheological parameters and borehole-drill rod geometric data; preprocessing the data; calculating annulus pressure loss, drill rod pressure loss and drill bit pressure loss of each test point based on an API standard formula; establishing a pumping pressure-pressure consumption associated linear equation set and solving annulus and drill rod pressure consumption correction coefficients; and outputting a shaft bottom ECD for eliminating naked eye interference in combination with the real-time drilling parameters and the inversion coefficient. According to the method, the multi-point cycle test and the dynamic inversion model are combined, the deviation between the theoretical model and the actual working condition is quantified through the correction coefficient, the weighted least square and the matrix condition number pre-judgment technology are combined, the problem of ECD calculation misalignment of a traditional method is solved, and the pressure control precision and safety in a complex drilling scene are remarkably improved.

The invention relates to the technical field of oil and gas drilling and completion engineering, in particular to a rock core hydration strain monitoring method and device based on multi-source fusion data, and the method comprises the steps: collecting first hydration strain data generated in the hydration process of a rock core through a rock core hydration strain monitoring system; inputting the first hydration strain data into a noise reduction model to obtain second hydration strain data after noise reduction; the second hydration strain data are converted into hydration stress data through an evolution model, distribution and evolution prediction results of the hydration stress in time and space are obtained, and the evolution model is obtained based on strain sample sequence data and stress label training and used for representing the mapping relation between the hydration strain and the hydration stress. The method accurately identifies the core hydration expansion evolution characteristics and predicts the well wall stability state, improves the experimental analysis efficiency and the result reliability, and has an important value for researching well wall stability monitoring and prevention and control.

The invention discloses an electricity-to-oil intelligent digital driving method and system adaptive to a petroleum drilling working condition, and belongs to the field of petroleum drilling engineering.The method comprises the steps that petroleum drilling data are collected through a multi-source sensor group, and the collected data are sent to an edge gateway controller to be preprocessed; a multi-source data stream obtained through preprocessing is sent to a cloud end, and a multi-source database is constructed; the intelligent torque prediction model is deployed at the cloud end, real-time estimation of the current drill bit load torque is achieved according to data in the multi-source database, and a drill bit prediction torque value is obtained; the cloud end issues the predicted torque value obtained through calculation to the edge gateway controller, and the edge gateway controller generates an actual control instruction according to the received predicted torque value. Safe and stable operation of drilling operation can be effectively guaranteed.

The invention relates to the technical field of petroleum and natural gas drilling engineering, and discloses a deep well geological exploration tunneling parameter control system and method, and the system comprises a signal collection and synchronization module which collects drilling parameters and aligns timestamps; the initialization and modeling module is used for calculating fluid transmission time lag and blade skim-over frequency; the active disturbance generation module generates a target bit pressure instruction superposed with sine disturbance to drive load application; the two-channel feature extraction and verification module aligns the historical torque and the current pressure according to time delay and calculates the confidence coefficient in combination with the frequency; the adaptive decision and closed-loop control module uses the confidence coefficient to correct the gain and update the reference bit pressure to form a closed loop. A dual-channel verification framework based on fluid-structure interaction transmission time lag and blade characteristic frequency is constructed, the covering effect of long-distance drill column friction torque on real cutting torque in deep well operation is effectively stripped, and it is ensured that a control system only responds to effective rock breaking action.

The invention belongs to the technical field of petroleum drilling engineering, and discloses a drilling fluid leakage position prediction positioning system, which comprises a data acquisition module, a data processing and analysis subsystem, an intelligent diagnosis subsystem, a scientific decision subsystem and a visualization module, and is characterized in that the data acquisition module is used for acquiring multi-source data in a drilling process in real time; and the data processing and analysis subsystem is used for carrying out data cleaning and feature extraction on the collected data. According to the scheme, multi-dimensional data of geology, engineering, fluid and the like are integrated, and through combination of machine learning and a mechanism model, the layer position of leakage, the type of leakage and the width of a crack are judged with high precision. According to the method, the leak-proof and leak-stopping scheme is designed, the leak-proof and leak-stopping material with good leak-stopping performance and high material quantitative score is recommended, the leak-proof and leak-stopping scheme is further designed, the well leakage analysis and leak-stopping technology of the fractured stratum has pertinence, effectiveness and scientificity, technical support is provided for leakage prevention and control, and therefore the service is provided for scientific and high-quality well drilling and efficient exploitation of oil fields.

The invention relates to the field of petroleum and natural gas drilling engineering, and discloses a bent screw control device and method and a bent screw sliding guide system. The bent screw control device comprises a main body shaft, a lower joint, a friction outer cylinder, a friction inner cylinder, a clutch module and a control module. The control module can clutch the friction outer barrel and the friction inner barrel and control the clutch duration of the friction outer barrel and the friction inner barrel in the directional drilling working condition, torque transmission among the clutch drill rod, the main body shaft, the friction inner barrel, the clutch module, the friction outer barrel, the lower connector and the bent screw is achieved, the actual tool face angle of the bent screw is close to the expected tool face angle, and the drilling efficiency is improved. Therefore, the difference between the actual tool face angle and the expected tool face angle of the bent screw rod meets the required range, and effective control and balance of orientation of the bent screw rod are achieved.

A side slag discharging device for large-diameter reverse circulation drilling, comprising a slag discharging body and a central body. The slag discharging body is in the shape of a short cylinder, and the central body passes through the slag discharging body, with the two being rotationally matched. The central body is of a hollow structure, and the slag discharging body is of a cavity structure. An annular cavity is formed between the central body and the slag discharging body. The slag discharging body is provided with a slag discharging port, which is located tangentially on the side of the slag discharging body, and the slag discharging port communicates with the annular cavity of the slag discharging body. An internal plug is provided inside the central body, and the internal plug closes the upper part of the central body. An air passage of the central body is provided on the side wall of the central body, and an air passage of the internal plug communicating with the air passage of the central body is provided above the internal plug. A side window is provided in the middle of the central body, and the side window communicates with the annular cavity. When the device of the present invention is installed on a common power head drill and a rotary table drill, it can be used for large-diameter reverse circulation drilling construction, which can greatly improve the construction efficiency and reduce the production cost. The present invention is not only suitable for power head drills with a small through diameter, but also can be used for rotary table drills in oil drilling and engineering drilling.

The invention discloses a casing centralizer with a pipe diameter adjusting function, and relates to the technical field of petroleum and natural gas drilling engineering equipment, the casing centralizer comprises two fixing rings which are symmetrically distributed left and right, the outer surface of each fixing ring is provided with a plurality of fixing seats at equal intervals in the circumferential direction, and each fixing seat is rotatably connected with a connecting plate; an elastic plate is arranged between the left connecting plate and the right connecting plate in the horizontal direction, and the two ends of each elastic plate are rotationally connected with the two adjacent connecting plates respectively. By rotating the adjusting bolt, the driving screw rod and the fixing pipe are in threaded transmission, and the distance between the two fixing rings is accurately controlled, so that the annular supporting frame formed by the connecting plate and the elastic plate generates controllable radial deformation; stepless adjustment of the supporting outer diameter is achieved, different borehole sizes are accurately matched, the problem that a centralizer with a fixed size is insufficient in supporting or difficult to descend is solved, it is ensured that a casing pipe is efficiently centered, and a foundation is laid for forming a uniform cement sheath.

The invention discloses a volume fractured horizontal well segmentation clustering method based on mechanical specific energy and a genetic algorithm, and relates to the field of well drilling and completion engineering in petroleum and natural gas. A traditional geometric division method is difficult to meet the refining requirement on a segmentation scheme in actual engineering; drilling dynamic data are collected, a drilling dynamic data set table under the equal well depth interval is formed according to the well depth step length, and drill torque and bit pressure are calculated; mechanical specific energy of the horizontal well section is calculated according to the drilling dynamic data set table, and a mechanical specific energy value set along a borehole is obtained; generating an initial population based on a set constraint condition, and obtaining the fitness of each individual in the initial population; randomly extracting a set number of individuals from the initial population to form a candidate set, and performing fitness calculation, selection, crossover and mutation operations until the maximum number of iterations is reached to complete iterative optimization; and outputting an optimal segmentation scheme and perforation cluster distribution, and performing drilling construction according to the optimal segmentation scheme and the perforation cluster distribution.

The utility model relates to the technical field of drilling engineering, and particularly discloses a locking device of a flashboard blowout preventer, which comprises a hydraulic cylinder head, the hydraulic cylinder head is provided with an inner hole and an observation groove communicated with the inner hole, the hole wall of the inner hole is provided with at least two first locking petals protruding along the radial direction, and the first locking petals are distributed at intervals along the circumferential direction. A lock groove is formed in the middle of each first lock petal; the manual locking shaft is arranged in the inner hole in a penetrating manner; the locking shaft sleeve is arranged outside the manual locking shaft in a sleeving mode, and second locking petals corresponding to the first locking petals are arranged on the peripheral face of the locking shaft sleeve; the locking rod is used for being arranged in the observation groove in a penetrating mode and inserted into the locking hole so as to drive the locking shaft sleeve and the manual locking shaft to rotate around the axis, and therefore the second locking petal can rotate in the locking groove till the second locking petal is opposite to the first locking petal so as to be locked in the axial direction. The locking device of the flashboard blowout preventer is simple in structure, convenient to operate, safe and reliable, and is not easily locked due to corrosion and other reasons through matched locking of the first locking petal and the second locking petal.

The present invention relates to a preparation method and application of a composite while-drilling leak-proof agent, and belongs to the field of oil drilling engineering technology. The composite while-drilling leak-proof agent is prepared from the following components in percentage by mass: 20-45% nano-composite particles, 15-35% multi-stage fiber-reinforced network materials, 10-20% intelligent response plugging agent, 5-10% high-temperature resistant additive, 1-5% dispersant, and the balance is deionized water, and the total content of each component is 100%. The composite while-drilling leak-proof agent provided by the present invention introduces a core-shell structured thermosensitive resin to realize a three-dimensional synergistic mechanism of "nano-composite particle filling-multi-stage fiber network bridging-intelligent response curing", thereby realizing efficient and environmentally friendly plugging of ultra-high temperature and high-pressure formations. The success rate of single plugging is increased from 45% to 92%, and the average operation time is shortened by 60%, providing an efficient solution for deep and ultra-deep drilling.

The invention provides a method and system for determining the track of a ground reverse inclined shaft of a steeply inclined seam, and relates to the technical field of steeply inclined seam mining and ground drilling engineering. A wellbore trajectory design basic model is established based on coal seam boundary elevation, coal seam inclination angle, effective thickness and roof mechanical parameters; constructing a rectangular plane coordinate system on the top plate side of the goaf to obtain a space coupling relation between a shaft track and a rock stratum structure; smooth transition of a wellbore track is achieved through segmented arrangement of a vertical well section, a deflecting section and a reverse inclining section; determining a rock stratum movement line and calculating an included angle by combining ground surface movement monitoring, and delimiting a safety protection zone between the rock stratum movement line and a roof fracturing target layer; and finally, a trajectory equation of each well section is established with the safety protection zone, the rock stratum movement line intersection point and the rock stratum movement influence boundary as constraints, and a reverse inclined shaft trajectory meeting the requirements for interference avoidance safety and fractured layer coverage precision is obtained.

The invention belongs to the technical field of underground pipeline inspection well engineering, and particularly provides a double-wall reinforced soil inspection well structure and a construction method.The double-wall reinforced soil inspection well structure is installed on a natural foundation and comprises a supporting structure, a foundation reinforcing structure and a well body structure; the lower portion of the supporting structure is inserted into the natural foundation, the foundation reinforcing structure is connected to the portion, in the supporting structure, of the natural foundation, the well body structure is connected to the portion, above the foundation reinforcing structure, of the well body structure, and the well body structure comprises a bottom plate, a wall body outer plate, a wall body inner plate, a cover plate and a well cylinder with a cover. The problems that an existing inspection well is large in construction difficulty, long in construction period and high in engineering cost are solved, and the inspection well is easy to construct, short in construction period and low in engineering cost.

The invention discloses a fracture-vug stratum well wall rock mechanical parameter prediction method based on well drilling chipping rock hardness in the fields of geomechanics, oil and gas well engineering and petroleum and natural gas exploitation. The method comprises the following steps: (1) well drilling chipping rock pretreatment and hardness testing; (2) constructing a quantitative relationship between rock skeleton mechanical parameters and hardness based on a homogeneous isotropic numerical model; (3) extracting stratum fracture-cavity structure characteristic parameters, and constructing fracture-cavity development rock numerical models of different sizes; (4) performing numerical simulation to calculate rock mechanical parameters of the fracture-vug development rock numerical models of different sizes; (5) well wall rock mechanical parameters of the fracture-cavity stratum are obtained through calculation; the invention provides a brand new theory and method for predicting and evaluating the mechanical parameters of the well wall rock of the complex structure stratum, and has important significance on safe drilling, efficient fracturing and the like of unconventional oil and gas resources such as deep and ultra-deep oil and gas, especially deep shale oil and gas of fracture-cavity development, deep complex carbonate rock oil and gas and the like.