1927 results about "Horizontal wells" patented technology

The invention relates to the technical field of hydraulic fracturing, in particular to a method for evaluating effectiveness of fracture parameters of artificial fracturing of a horizontal well. The method comprises the following steps that information collection based on ground process parameters and underground dynamic parameters is conducted on the horizontal well artificial fracturing construction process, and fracturing working condition data are obtained; according to the fracturing working condition data, the fracture expansion of the horizontal well is monitored in real time, digital conversion processing is conducted, and real-time fracture monitoring data is generated; performing micro-seismic signal analysis on the real-time crack monitoring data, and performing crack network space distribution calculation to generate crack network distribution data; performing reservoir stress field dynamic evolution analysis according to the fracture network distribution data to generate stress field distribution data; and carrying out propping agent migration trajectory tracking according to the stress field distribution data to generate propping agent distribution data. According to the method, the reservoir stress field dynamic evolution analysis and the proppant migration mechanical model are combined, and the effectiveness of the fracture parameters can be evaluated more accurately.

The invention relates to the technical field of unconventional oil-gas exploration, and discloses a well-seismic integrated horizontal well geosteering risk evaluation method, which comprises the following steps: S1, acquiring three-dimensional seismic data, measurement while drilling data and geological logging data through a well-seismic integrated data acquisition platform; s2, constructing a horizontal well geosteering dynamic model based on multi-source heterogeneous data, and integrating a seismic inversion result and real-time drilling parameters; by establishing a well-seismic data dynamic fusion mechanism and a multi-source risk quantification model, the problem of space-time dislocation of seismic inversion and measurement-while-drilling data is solved, the recognition precision of a fault boundary, a lithologic interface and a pressure abnormal zone is ensured to be matched with drilling position changes in real time, risk misjudgment caused by model updating lag in a traditional method is eliminated, and the accuracy of the method is improved. The accuracy and timeliness of geosteering decision making of the complex structure area are improved; by monitoring well track deviation and geological model prediction deviation in real time, the risks of well wall instability and target deviation are avoided, and the operation safety of the horizontal well in the full life cycle is guaranteed.

The invention belongs to the technical field of shale oil horizontal well three-dimensional development, and particularly discloses a shale oil three-dimensional well network well location multi-objective optimization method which is used for solving the problem of how to achieve multi-objective collaborative optimization of the recovery ratio, the economic benefit and the inter-well interference degree. Comprising the following steps: (1) constructing a multi-field coupling dynamic oil drainage volume characterization model; (2) establishing an inter-well interference degree quantitative evaluation system based on the dynamic oil drainage volume characterization model; (3) realizing multi-source data fusion and high-precision prediction on the dynamic oil drainage volume, the recovery ratio, the net present value and the inter-well interference degree by combining a CNN-LSTM deep learning prediction model; and (4) implementing multi-objective optimization based on an NSGA-III multi-objective optimization algorithm, and comprehensively balancing the recovery ratio, the net present value and the inter-well interference degree on the premise of meeting engineering and economic constraints. Reliable technical support is provided for decision deployment of oil reservoir engineers under complex development conditions.

The invention relates to a horizontal well jet flow axial slotting pressure relief coal and coal bed gas co-mining method. The method comprises the steps of horizontal well building, axial continuous hydraulic slotting, coal bed drainage pressure relief and coal and coal bed gas co-mining. The axial continuous hydraulic slotting comprises the steps that a casing pipe is put into a horizontal well; a plurality of slots are formed in the sleeve, and a directional structure is arranged in the sleeve; the water jet tool pipe column is tripped into the casing pipe, and the lateral nozzle is kept to move directionally along the directional structure; when the lateral nozzle is aligned with the foremost slot, high-pressure water sprayed by the lateral nozzle penetrates through the foremost slot to impact the coal seam, and high-pressure water sprayed by the axial nozzle pushes the oil pipe to retreat; when coal seam slotting at each slot is completed, water injection is stopped, and the oil pipe is pulled backwards; when the lateral nozzle is aligned with the next slot, the high-pressure water sprayed out of the lateral nozzle penetrates through the next slot to impact the coal seam, and the high-pressure water sprayed out of the axial nozzle still pushes the oil pipe to retreat; and the steps are repeated till coal seam slotting at the last seam groove is completed.

The invention provides a cement paste system with high strength, elasticity and toughness and application of the cement paste system in deep coal bed gas horizontal well cementation, and the cement paste system is prepared from the following raw materials in parts by mass: 40-70 parts of oil well cement, 13-40 parts of fly ash, 15-45 parts of slag, 5.0-20.0 parts of water-based organic silicon resin, 0.1-0.5 part of ultra-high performance polyethylene fiber, 3.0-8.0 parts of calcium oxide and 2.0-5.0 parts of calcium sulfate whisker. 1.0-8.0 parts of nano silicon dioxide, 1.0-6.0 parts of a fluid loss agent, 0.5-2.0 parts of a drag reducer, 0.2-1 part of a defoaming agent and 50-80 parts of water. The cement paste system disclosed by the invention has the characteristics of remarkable low-temperature quick setting and high early strength, also has the advantages of low water loss, controllable thickening, simple preparation operation and the like, and set cement is high in compressive strength, high in breaking strength and very excellent in elastic and tough mechanical properties.

The invention belongs to the technical field of shale oil and gas development, and particularly discloses a multi-source information fused horizontal well casing deformation risk section prediction method, which comprises the following steps: representing shaft crack zone information; establishing a work area construction model and an attribute model; with shaft crack zone information as a constraint, disturbance is performed on crack information predicted based on seismic data, and a three-dimensional crack network model is established; a work area geomechanical model is established, and crustal stress distribution characteristics in the shaft direction of the horizontal well are obtained; a work area casing deformation comprehensive database is established by combining casing mechanical attribute data and work area fracturing construction parameters, and fault zone activity factors are obtained based on the Mohr-Coulomb criterion; and establishing a stratum-fracture-wellbore model, obtaining a mathematical model of fracture zone activity factors and casing deformation degrees, and dividing casing deformation risk grades. According to the method, accurate recognition of the well periphery crack network and advanced pre-judgment of the well periphery crack activation risk and the wellbore casing deformation can be achieved, and guidance is provided for formulating targeted casing deformation prevention and control measures.

The invention discloses a method and device for recognizing the water outlet position and the water outlet mode of a horizontal well based on DTS temperature profile features. Comprising the following steps: acquiring distributed optical fiber temperature sensing (DTS) temperature profile data along a horizontal shaft; establishing a multiphase flow horizontal well temperature prediction composite model as a forward model; an inversion model is established, and stratum permeability distribution and an oil-water output profile are obtained; according to the well section with the water phase liquid production capacity exceeding a preset threshold value in the production profile, the water outlet position of the horizontal well is recognized; and determining the water outlet mode of the horizontal well by combining the analysis result of the multiphase flow horizontal well temperature prediction composite model on the temperature response in different water outlet modes according to the temperature change characteristics presented at the identified water outlet position by the DTS temperature profile. Compared with the prior art, the water outlet position can be more accurately recognized, the water outlet mode can be effectively distinguished, the monitoring cost is reduced, and powerful technical support is provided for water control and oil stabilization of the horizontal well.

The invention provides a new method for calculating the borehole wall collapse pressure of a fractured shale stratum, which comprises the following steps of: 1, preparing an experimental rock sample, and carrying out sound wave characteristic test on bed rock and a fractured rock sample and mechanical experiment test on the rock sample; step 2, calculating an integrity coefficient K upsilon, a geological strength index GSI, a rock mass disturbance coefficient D and a lithology index mi of the rock; 3, a Hoek-Brown strength criterion for evaluating the fractured formation based on sound waves is established; 4, a principal stress expression of the well walls of the inclined well and the horizontal well is obtained through calculation; and 5, establishing a fractured oil shale formation borehole wall collapse pressure calculation model. According to the new method for calculating the well wall collapse pressure of the fractured shale formation, the problem that a conventional homogeneous formation collapse pressure calculation model is not suitable for well wall stability prediction of the fractured shale formation is solved, and a new theoretical basis and technical support are provided for the well wall stability problem in the oil shale exploitation process.

The invention relates to a fractured well output profile evaluation method using a carbon quantum dot tracer agent, which comprises the following steps: collecting and arranging historical data of a horizontal well output profile tested by the existing quantum dot tracer agent, including geological parameters, engineering parameters and output profile data corresponding to each well; preprocessing the data, establishing a fractured well output profile prediction model, inputting the preprocessed data, and training the fractured well output profile prediction model for later use; and comparing the output profile prediction data with the output profile fact data to evaluate the prediction effect of the current fractured well output profile prediction model, and adjusting the fractured well output profile prediction model to obtain the adjusted fractured well output profile prediction model. Compared with the prior art, the method has the advantages that the production profile of the newly developed horizontal well can be effectively predicted, and the exploitation efficiency and economic benefits of oil and gas exploitation can be improved.

The invention belongs to the technical field of shale oil horizontal well three-dimensional development, and particularly discloses a three-dimensional well pattern interference evaluation method based on dynamic oil drainage volume. The method is used for solving the problem of how to establish an accurate inter-well interference evaluation method under the conditions of high reservoir heterogeneity and complex inter-well mutual influence. Comprising the following steps: (1) constructing a multi-field coupling dynamic oil drainage volume characterization model based on reservoir pressure field evolution, fluid seepage characteristics and fracture network response, and realizing quantitative and dynamic evaluation of shale oil reservoir inter-well interference; and (2) establishing an inter-well interference degree quantitative evaluation system based on the multi-field coupling dynamic oil drainage volume characterization model, and measuring the space overlapping degree and the pressure field difference of the oil drainage volume of each well by using the inter-well interference degree quantitative evaluation system so as to provide a quantitative basis for well pattern layout and interference control. According to the method, the dynamic seepage characteristics of the shale oil reservoir and the inter-well competition relationship are tightly coupled, and the interference identification precision is improved.

The invention provides a coal mine scour prevention and shock absorption method with ground horizontal wells and vertical wells arranged in a combined mode, and relates to the technical field of coal mining. By means of the coal mine anti-scour shock-absorbing method for combined arrangement of the ground horizontal well and the vertical well, the advantages of fracturing of the ground horizontal well and the vertical well can be effectively fused, and the defects that single ground vertical well or ground horizontal well arrangement is high in construction cost, limited in coverage range and limited in composite disaster control are overcome; the invention provides a coal mine anti-impact damping technical scheme which is effective and good in economical efficiency. The invention provides a determination basis for comprehensively analyzing and judging fracturing position selection and well shaft arrangement positions of a ground horizontal well and a ground vertical well by combining working face data and open hole logging data, and a method for finely judging and optimizing the fracturing position based on a logging result, and establishes a systematization and standardization basis for designing a ground fracturing overall scheme.

The invention relates to the technical field of hydrofracture simulation experiments, in particular to a true triaxial hydrofracture fault slippage casing deformation monitoring method and system, and the method comprises the steps: preparing a target reservoir simulation sample; arranging and installing a shaft and a sensor; carrying out a water pressure physical model experiment and recording experiment data; and analyzing and processing the experimental data, and performing quantitative evaluation by combining the final state of the target reservoir simulation sample. According to the method, the shear deformation influence of fault slippage on the shaft casing under the true triaxial hydraulic fracturing condition can be quantitatively evaluated; scientific basis is provided for optimization of fracturing optimization design parameters, and engineering practical significance is achieved for optimization of the horizontal well casing damage prevention and control theory and on-site construction design.

The invention discloses a deep coal and rock gas horizontal well pressure drainage working system optimization method and system, and the method comprises the steps: building a dynamic relation between the pressure drop and the flow of an oil nozzle based on a Gilbert model, and predicting the change of the gas-water ratio at different stages in combination with a double logarithmic segmentation fitting formula of the flow-back rate and the gas-water ratio; constructing a fracture quasi-steady-state flowing substance balance equation, and deducing an inflow dynamic curve of the flowing bottomhole pressure and the water yield; a Gray multiphase flow model is adopted to calculate the wellbore pressure gradient, and an outflow dynamic curve of the flowing bottomhole pressure and the liquid production capacity is generated; a reservoir, a shaft and an oil nozzle pressure system are coupled through a node system analysis method, an inflow-outflow coordination point is matched, and the size range of the oil nozzle is dynamically optimized. The method realizes accurate prediction and real-time regulation and control of drainage and mining parameters, solves the problem of rapid attenuation of fracture conductivity caused by high stress sensitivity of coal rocks, reduces the risk of pulverized coal blockage, improves the gas recovery efficiency, and is suitable for efficient development of deep coal rock gas wells.

The present disclosure may provide a method and a system for optimization of fracture parameters of segmented multi-cluster fracturing in a horizontal well of a continental shale. The method includes: establishing a fracture extension model; performing a layer-crossing extension simulation of a single-cluster hydraulic fracture based on at least one injection displacement and at least one fracturing fluid viscosity to determine engineering parameters for the single-cluster hydraulic fracture; determining engineering parameters for multi-cluster hydraulic fractures based on the engineering parameters for the single-cluster hydraulic fracture; determining, based on the engineering parameters for the multi-cluster hydraulic fractures, an equilibrium expansion index and a ground construction pressure for the multi-cluster hydraulic fractures corresponding to at least one perforation parameter; and filtering an optimal perforation parameter based on the equilibrium expansion index and the ground construction pressure.

The invention discloses a combined well spacing method for a ground vertical well and an underground horizontal well, which comprises the following steps of: determining estimated fracturing information of the vertical well and estimated fracturing information of the horizontal well according to acquired fracturing construction information of a surrounding mine; the width of the to-be-mined working face and the lateral mining-induced fracture range of the mined working face are obtained, vertical well construction information is determined according to the width of the to-be-mined working face, the lateral mining-induced fracture range and vertical well estimated fracturing information, fracturing construction is conducted on the thick and hard roof based on the vertical well construction information, and the vertical well fracturing range of a ground vertical well is obtained; and horizontal well construction information is determined according to the horizontal well estimated fracturing information and the vertical well fracturing range, and fracturing construction is conducted on the impact main control rock stratum based on the horizontal well construction information. According to the combined well spacing method for the ground vertical well and the underground horizontal well, the well spacing scheme that the ground vertical well and the underground horizontal well are matched with each other is adopted, sufficient fracturing and pressure relief can be conducted on a thick and hard top plate, and cooperative prevention and control over rock burst and mine earthquake disasters are achieved.

Provided is a method for determining huff and puff fluid volumes in multi-scale spaces of shale oil reservoirs, including the following steps: rock sample pretreatment; porosity stress sensitivity testing; high pressure hg injection testing and nuclear magnetic resonance testing benchmarking; online nuclear magnetic resonance testing; data processing and analysis. Firstly, a changing law of multi-scale spaces of shale oil reservoirs with an effective stress is characterized through a pore stress sensitivity measurement and online nuclear magnetic resonance measurement combined experiment, and then the huff and puff fluid volumes of multi-scale spaces of shale oil reservoirs under a condition of a certain stimulated reservoir volume are calculated. A usage amount of a fracturing fluid for a fracturing horizontal well in the shale oil reservoir is determined from the perspective of giving full play to the imbibition replacement role of micro-nano pores.

The invention belongs to a drilling operation tool, and particularly relates to a rock breaking drilling simulation experiment bench of a drilling tool system. The rock breaking drilling simulation experiment bench of the drilling tool system is mainly composed of a main frame, a bottom frame, a hydraulic cylinder, a power module, a vibration measurement module and a bit pressure-torque measurement module. A certain drilling tool combination can be selected to perform a drilling experiment on a certain rock, a single-drill-bit rock breaking or / and while-drilling reaming rock breaking drilling operation experiment can be realized, and drilling pressure, rotating speed, torque and drilling tool and drill bit vibration and motion trail parameters are acquired in a multi-point manner; the experiment bench is provided with a hydraulic lifting device, so that conditions of a horizontal well, a vertical well, an inclined well and the like can be simulated. According to the invention, different drilling operation modes such as simulation of a horizontal well, a vertical well and different types of boreholes with different inclination angles, single-drill-bit drilling and reaming while drilling can be realized, the universality of the experiment bench is improved, and diversified and perfect experiment conditions are provided for related research.

The invention relates to the technical field of oil field fracturing operation, and provides a horizontal well shaft completion pipe string and a reconstruction method.The horizontal well shaft completion pipe string comprises an original casing pipe, an inner casing pipe, a suspension packer, a shearing ball seat, a float collar, a float shoe and a plurality of composite metal pipe outer packers.The suspension packer is connected to one end of the inner casing pipe, and the shearing ball seat, the float collar and the float shoe are sequentially connected to the other end of the inner casing pipe; a plurality of composite metal pipe outer packers are sequentially arranged on the inner casing pipe at intervals and used for blocking an annular space between the original casing pipe and the inner casing pipe and forming a plurality of fracturing sections, the inner drift diameter of a reconstructed new shaft is large, large-displacement and high-pressure fracturing construction can be met, the construction cost is reduced, the repeated transformation efficiency of an old well reservoir is improved, and the construction period is shortened. And in the later period, the original gas production section can be ejected to implement commingling production, and the oil-gas output efficiency is further improved.

The invention provides a shale oil reservoir well factory horizontal well fracturing parameter optimization method, and relates to the technical field of horizontal well fracturing parameter optimization, and the method specifically comprises the steps: obtaining a plurality of groups of horizontal well historical fracturing parameters, and obtaining an oil and gas production value corresponding to each group of historical fracturing parameters, performing one-to-one mapping on the historical fracturing parameters and the corresponding oil and gas yield values to generate a sample data set; and constructing an oil and gas yield prediction model, inputting the initial optimized fracturing parameter combination into the oil and gas yield prediction model to obtain an oil and gas yield prediction value, constructing a fitness function according to the oil and gas yield prediction value, and obtaining an optimal fracturing parameter combination through a genetic algorithm. Parameters in the optimal fracturing parameter combination are corrected according to the environment correction factors, specific values of the fracturing parameters are obtained, the horizontal well fracturing parameters are optimized according to the specific values of the fracturing parameters, the trial and error cost in the horizontal well fracturing process is reduced, and the resource utilization rate is increased.

The invention provides a stratified reservoir lamination fracture high-crossing evaluation method and device, and relates to the technical field of oil-gas exploration, and the method comprises the steps: carrying out the combined analysis of a geomechanical model based on a target position of a research area, a first fracture propagation analysis result and a second fracture propagation analysis result, and obtaining a first fracture propagation analysis result and a second fracture propagation analysis result; determining conditions of crack induced bedding opening and crossing expansion under different reservoir and interlayer stress differences and interlayer thicknesses, and drawing a crack height crossing evaluation chart corresponding to the target position by taking the reservoir and interlayer stress differences and the interlayer thicknesses as two-dimensional coordinate axes; and performing layer crossing evaluation before fracturing construction of the to-be-built production block by using the seam height layer crossing evaluation chart. According to the method, the fracture height crossing evaluation chart is determined by combining the formation mechanical characterization, the fracture propagation physical simulation experiment and the multi-cluster fracturing fracture propagation numerical simulation experiment in the horizontal well, then the crossing evaluation of the to-be-built production block is carried out, and the post-fracturing production capacity, the overall production effect of the reservoir and the overall development benefit of the stratified reservoir are improved.

The invention discloses a shale oil and gas horizontal well layer-crossing expansion fracturing method and application. The fracturing method comprises a pre-fracturing step and a fracture forming step. The displacement of fracturing fluid used in the pre-fracturing step is gradually increased, and the displacement increasing amplitude is gradually increased; the fracture forming step comprises a four-stage reinforced temporary plugging construction step, and variable displacement temporary plugging construction is adopted when temporary plugging balls are delivered for temporary plugging construction. According to the fracturing method, the space-time form of fracture expansion is reasonably regulated and controlled, fracture diversion and reservoir matrix serious damage caused by too high viscosity of fracturing fluid are avoided while the fracture height completely penetrates through a target small layer, the problems that the fracture is excessively expanded in a non-target layer, centralized transformation and repeated transformation are conducted near a shaft and the like are solved, and the fracturing efficiency is improved. The fracture length is greatly increased, the size and the drainage area are effectively transformed, and the fracturing targets of promoting generation of complex fractures and improving the yield and the efficiency through layer-penetrating body expansion are achieved.

The invention belongs to the technical field of petroleum and natural gas engineering, and particularly relates to a priori knowledge embedded unsupervised learning geology-engineering dessert comprehensive evaluation method, which comprises the following steps: S1, obtaining an evaluation data set of a research area, and preprocessing and standardizing the evaluation data set; s2, dividing the evaluation data set into a positive index and a negative index according to the prior knowledge, constructing positive and negative ideal points through the prior knowledge, and fusing to generate an unsupervised evaluation data set; s3, clustering is carried out on the unsupervised evaluation data set by adopting principal component analysis and an incremental online k-means algorithm; and S4, according to category labels obtained by clustering, determining geological-engineering dessert grades by adopting a standardized variable distance grading evaluation method, and carrying out segmented clustering optimization and perforation position optimization on the geological-engineering dessert grades. According to the method, a supervised evaluation effect is achieved through an unsupervised algorithm, comprehensive evaluation of the dessert of the fractured horizontal well section is achieved, and the problem of unlabeled data evaluation is effectively solved.

The invention discloses a quantitative evaluation method for complexity of shale oil and gas horizontal well reservoir reconstruction cracks, which comprises the following steps: determining a crack development strength factor representing reservoir inherent crack development potential by calculating a mineral heterogeneous coefficient based on rock sample mineral component data at each perforation cluster position in a target fracturing section; determining the optimal fracture length by combining reservoir numerical simulation, determining the total fracturing fluid amount, performing non-uniform distribution according to the heterogeneity of each cluster, and determining a fracture propagation complexity factor representing the dynamic propagation complexity of the hydraulic fracture; weighting the two factors to obtain a crack complexity index for comprehensively evaluating the reservoir transformation effect, and performing grading; according to the method, static geological evaluation and dynamic engineering evaluation are combined, quantification of inter-cluster transformation differences is achieved, the defects that a traditional method is one-sided in evaluation and low in precision are overcome, and a reliable quantitative basis is provided for optimal design of a shale oil and gas reservoir fracturing scheme and accurate evaluation of the transformation effect.

The invention provides a well position deployment construction method for a fractured horizontal well considering mine pressure treatment and gas extraction. The well position deployment construction method comprises the steps that firstly, a target key layer is determined; secondly, a ground L-shaped horizontal well is constructed; thirdly, hydraulic staged fracturing is conducted; step 4, reinjection; step 5, filling; sixthly, gas is extracted in a high extraction roadway; and 7, high-position drilling gas extraction is carried out. The method has the advantages of being controllable in drilling track, wide in influence area, low in construction cost and the like, rock burst can be effectively prevented and controlled, the problem that gas in a mining area and a goaf exceeds the limit is solved, meanwhile, the roadway tunneling work amount is reduced, and the purposes of reducing cost and improving efficiency are achieved. According to the method, multiple purposes are achieved through one well, treatment of the rock burst area of the deep coal seam is achieved, the gas extraction effect of a mining area in stoping and the gas extraction effect of a goaf after stoping are improved, and safe production of a mine is guaranteed.

The invention discloses a horizontal well injection-vertical well extraction well pattern arrangement and mining method for in-situ leaching uranium mining, and relates to the field of mining engineering. The main method for arranging the well pattern comprises the steps that a horizontal liquid injection well is arranged in the middle of an ore bed in the trend of the ore bed, vertical liquid pumping wells with the same number are arranged on the two sides of the horizontal liquid injection well, the distances between the adjacent vertical liquid pumping wells on the same side of the horizontal liquid injection well are equal, and the vertical distances between the vertical liquid pumping wells and the horizontal liquid injection well are equal and are half of the distances between the adjacent vertical liquid pumping wells; the horizontal distance between the peripheral vertical liquid extraction wells and the end point of the horizontal well is half of the distance between every two adjacent vertical liquid extraction wells, and a similar determinant arrangement is formed. The mining method can overcome the defects of extraction and injection of traditional vertical liquid extraction wells, the leaching range of in-situ leaching uranium mining is expanded, and the leaching efficiency of in-situ leaching uranium mining is improved. Uranium mine mining nonuniformity caused by nonuniform flow distribution of the leaching liquid is reduced, and the uranium mine mining efficiency and the resource utilization rate are improved.

The invention discloses an anti-jamming PDC (polycrystalline diamond compact) drill bit. The anti-jamming PDC drill bit comprises a drill bit body. The invention belongs to the field of oil and gas drilling, and particularly relates to an anti-jamming PDC drill bit. The problems of low operation efficiency, large economic loss and high safety risk caused by the drill jamming problem in a complex well hole environment are solved. The anti-jamming PDC drill bit comprises a drill bit body, PDC cutting teeth, an intelligent monitoring module, an active jamming releasing module and a power module, and the intelligent monitoring module is used for monitoring underground working conditions in real time and recognizing the jamming risk in advance through a built-in jamming judgment algorithm; the active jam releasing module relieves the drill jamming state by dynamically adjusting the position of the drill bit and pressure distribution, and has the advantages of real-time monitoring and early warning, active jam releasing, a multi-mode jam releasing strategy and adaptability to the complex well environment, economic losses and safety risks caused by drill jamming are reduced, and the working efficiency is improved. The drilling fluid is suitable for drilling operation in complex underground environments such as deep wells, ultra-deep wells and horizontal wells.

The utility model provides a cable tensile strength testing device, and relates to the technical field of deep shale gas horizontal well fracturing. The first clamping and fixing mechanism is used for clamping and fixing a ferrule structure of the tested cable, and the ferrule structure is formed by bending one end of the cable into an arc-shaped closed loop; the rope sleeving column is transversely connected to the base in a sliding mode, and the loop structure can be connected to the rope sleeving column in a sleeving mode; the tension detection mechanism comprises a tension detector, one end of the tension detector is connected with the rope sleeving column, and the other end of the tension detector is connected with the base; the winding mechanism comprises a winding roller and a driving motor which are in transmission connection, the winding roller is installed on the base, and a containing groove is formed in the side wall of the winding roller; and the second clamping mechanism is arranged in the accommodating groove and is used for clamping and fixing the other end of the cable. And through the arrangement of the winding roller, the cable can be pulled, and the device can adapt to cables with different lengths.

The invention belongs to the technical field of coal bed gas exploitation, and particularly relates to a method for achieving multiple purposes of a coal bed gas horizontal well. Firstly, a horizontal well is constructed in a coal seam, staged fracturing is conducted to increase permeability, coal bed gas ground extraction is achieved, when the coal bed gas yield cannot reach the economic recoverable condition, coal underground gasification is conducted through the horizontal well, and finally carbon dioxide obtained after gasification separation or other output is injected for storage through underground residual coal and coal cinder gaps. Multiple purposes of the coal bed gas horizontal well are achieved; through one-well multi-stage utilization, the functions of coal bed gas extraction, coal underground gasification, carbon dioxide storage and the like are achieved step by step, and the comprehensive cost is reduced by 40% or above.

The invention relates to a method for predicting a fluid temperature field of a middle-deep layer sleeve type buried pipe containing a horizontal well, and the method comprises the following steps: constructing a heat transfer model of the middle-deep layer sleeve type buried pipe containing the horizontal well, and dividing the model into a vertical section and a horizontal section; and carrying out iterative solution on the heat transfer model. Compared with the prior art, the method has the advantages that the calculation amount is reduced, the temperature field is accurately predicted, and the like.