2591 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 discloses a thin mutual coal seam fracturing, gasification and carbon sequestration integrated method. The method comprises the steps of geological exploration and coal seam refined evaluation; a middle horizontal well is drilled downwards from the ground; top and bottom horizontal wells are planned and drilled in the uppermost and lower sandstone stratums of the thin mutual coal seam; a plurality of top and bottom fishbone wells are drilled obliquely downwards and upwards in the top and bottom horizontal wells; oxygen-enriched water vapor is injected into the middle horizontal well through a continuous oil pipe, the oxygen-enriched water vapor is squeezed into the reservoir under the action of high pressure, and fracturing operation is conducted; initiating an underground gasification process of the coal seam, and synchronously performing extraction operation of the coal seam gas; supercritical CO2 fracturing operation is conducted on the top horizontal well and the bottom horizontal well; injecting water-based fracturing fluid into the top horizontal well and the bottom horizontal well; gasified materials generated by coal seam combustion gasification and desorbed methane gas are extracted through the middle horizontal well, and supercritical carbon dioxide injected before is sealed for a long time. According to the method, the limitation of a traditional hydraulic fracturing technology can be solved, and the transformation effect of the reservoir can be improved.

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 discloses a method for calculating the migration of a proppant in a horizontal well fracturing crack and the global flow conductivity of the crack, and relates to the field of unconventional oil and gas reservoir yield increase renovation, and the method comprises the following steps: (1) establishing a reservoir geologic model according to on-site logging exploration data; (2) establishing a hydraulic fracturing crack propagation fluid-solid coupling model; (3) establishing a horizontal well fracturing inter-cluster flow distribution model; (4) constructing a propping agent migration liquid-solid two-phase flow model in the hydraulic fracture; (5) solving the fluid-solid coupling model and the proppant migration model through loop iteration, and predicting the concentration distribution of the proppant in the hydraulic fracture; and (6) on the basis of the crack width and the proppant distribution result, calculating the hydraulic fracturing crack global flow conductivity. According to the method, the proppant migration model is solved by adopting a high-order discrete format, dynamic coupling simulation of hydraulic fracture propagation and proppant migration under the mine field scale is realized, the global flow conductivity of the hydraulic fracture is calculated, and reference is provided for evaluation and optimization of unconventional reservoir fracturing transformation.

The invention relates to the technical field of downhole packer tools, in particular to an ultra-short radius sidetracking well flexible pipe outer packer which comprises an upper connector and a central pipe. The rotary bending device is reasonable and compact in structure and convenient to use, the upper connector and the center pipe can be rotationally bent to form a certain angle through the ball journal and the pressing cap, rigid connection between the upper connector and the center pipe in the prior art is converted into flexible connection, and the rotary bending device can smoothly pass through the inclined face and the deflecting section of the whipstock to reach the preset position; through well mouth pressing and pressure building, the packer can be reliably set on the well wall of a horizontal well section, a well hole is packed, and the purposes of half-way well cementation, staged and staged fracturing, reservoir transformation and the like are achieved; due to the fact that the center pipe can automatically rotate to adjust the angle between the center pipe and the upper connector under the action of well walls with different curvatures or inclined faces, the center pipe can better adapt to small-curvature well holes and irregular well walls, the friction force between the center pipe and the well walls is effectively reduced, and the center pipe is prevented from being clamped in a whipstock or the small-curvature well holes and damaging tools.

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.

Disclosed herein are systems and methods for producing natural gas from gas hydrates, which in some embodiments can sequester carbon dioxide. In an embodiment, the system includes: an injection well; a producing well; a producer annulus; a well annulus; a y-shaped well couple; a gas wellbore; a heating wellbore; a well tubing; a tank; a water pump; a separator; a wellhead choke; a work pipe; a CO2 compressor; a well casing; and a pressure-regulator valve. In another embodiment, the method includes: obtaining hot water using a y-shaped horizontal well couple; injecting water heated by geothermal energy; transferring heat from a geothermal zone to a gas hydrate deposit zoon using a dual-lateral horizontal well; regulating water-flooding flow rate using a wellhead choke; collecting water and natural gas using a dual-lateral horizontal well; and coupling the two horizontal wells through connection of two laterals in the gas hydrate zone.

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 provides an analysis method for multi-cluster fracturing crossing in a horizontal well section of a sand shale reservoir, which comprises the following steps of: based on a boundary element theory, considering three-dimensional fracture stress interference and flow distribution of each cluster, and establishing a full-three-dimensional fracture propagation numerical model of segmented multi-cluster fracturing stress interference and flow distribution of a tight gas horizontal well; coupling the wellbore flow model and the crack propagation numerical model through bottom hole pressure to obtain a coupling model; based on a three-dimensional boundary element theory, aiming at the coupling model, discretizing different fracture forms into rectangular units, and establishing a three-dimensional boundary element stress interference calculation model through a superposition principle; under the condition that geological factors are kept constant, the influence of different construction parameters on crack propagation and layer crossing behaviors is analyzed, a crack layer crossing main control factor is obtained, and the conditions and boundaries of segmented multi-cluster fracturing layer crossing of the sand-mud interbed horizontal well are determined. The method provides a basis for optimization of crack parameters and construction parameters.

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.

Disclosed is a synchronous one-injection and two-production tubing string for a single horizontal well, comprising an oil well pump (100), an upper bridge-type packer (300), an oil production bridge-type working barrel (400), a lower bridge-type packer (500), a hydraulic packer (600), and a soluble bottom plug (700). A first central channel (301) and a first bridge-type channel (302) which are independent of each other are provided in the upper bridge-type packer (300), and a first rubber cylinder structure (305) is provided outside the upper bridge-type packer (300); a second central channel (401) and a second bridge-type channel (402) which are independent of each other are provided in the oil production bridge-type working barrel (400), a lateral opening (403) capable of communicating the second central channel (401) and the outside of the oil production bridge-type working barrel (400) is further provided in the oil production bridge-type working barrel (400), and a temporary pipe (404) capable of sealing and blocking the lateral opening (403) is connected to the lateral opening (403) by means of a temporary shear pin (4041); a third central channel (501) and a third bridge-type channel (502) which are independent of each other are provided in the lower bridge-type packer (500), and a second rubber cylinder structure (505) is provided outside the lower bridge-type packer (500). Water injection at a middle section and oil production at two end sections of a horizontal well can be implemented by means of the tubing string, and injected water and produced liquid flow channels do not interfere with each other.

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.

A short radius drilling tool and a trajectory-controllable lateral drilling tool and method, including a lateral drilling section with high passing ability and a power transmission section, wherein the lateral drilling section with high passing ability can drill the extension well section of a short to ultra-short radius well section that extends laterally from a main wellbore. The designed trajectory-controllable lateral drilling tool allows a wellbore to be subjected to directional drilling with a short to ultra-short radius from a tail end or any position of the original wellbore trajectory, and then implements lateral extension drilling. Furthermore, the device has engineering feasibility and practical value for thin reservoir exploitation, remaining oil potential tapping, exploitation of horizontal wells in sub-salt reservoirs, combined exploitation of thin interbed, coalbed methane exploitation, underground gasification exploitation of coal mine, unconventional oil and gas exploitation, (seabed) shallow horizontal well drilling, and exploitation of other minerals.

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 provides an infilled well location determination method and device based on old well water ridge waves and a model. The infilled well location determination method comprises the steps that reservoir physical property parameters and fluid parameters of a production horizon of a target horizontal well and production dynamic data of the target horizontal well are obtained; obtaining a relative permeability curve and oil displacement efficiency through a rock core relative permeability experiment; the height of a water ridge during sidetrack drilling is calculated; the water ridge height, the reservoir physical property parameters, the fluid parameters and the production dynamic data are substituted into a horizontal well oil-water interface description formula, and the formula is nondimensionalized through normalization deformation; the corresponding relation between the dimensionless cumulative oil production and the dimensionless water ridge width and the dimensionless water ridge height is calculated through the oil displacement efficiency according to the water-oil displacement theory; establishing a data map comparison table of the dimensionless cumulative oil production, the dimensionless water ridge width and the dimensionless water ridge height, and judging the limit well spacing of the infilled well according to the data map comparison table; and according to the limit well spacing, carrying out encryption or branch reconstruction on the target horizontal well.

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.

Disclosed are an SAGD injection-extraction method, apparatus and computer device for a deep ultra-heavy oil reservoir. The injection-extraction method comprises: preheating a horizontal well (10) and vertical wells (20) in a vertical-horizontal combined well network, wherein the vertical-horizontal combined well network comprises a horizontal well (10) and a plurality of vertical wells (21, 22), and the plurality of vertical wells are symmetrically distributed on both sides of the horizontal well; determining whether the preheating treatment is finished or not; and when the preheating treatment is finished, alternately injecting steam into at least some of the plurality of vertical wells, and carrying out SAGD oil extraction by utilizing the horizontal well. By means of the injection-extraction method, heat loss caused by the buried depth during extraction of the deep ultra-heavy oil reservoir can be offset; the rising speed and overlying height of steam cavities at individual steam-injecting well points are effectively controlled, thereby preventing single-point breakthrough of steam, which facilitates an improvement in the development of the steam cavities; and extraction of the deep ultra-heavy oil reservoir is achieved, and the extraction ratio of the deep oil reservoir is largely guaranteed.

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 relates to the technical field of oil production engineering, in particular to a fracturing process for a tight oil horizontal well, which comprises the following steps: acquiring geological data information; determining a rock stratum state according to the pore reference value of the to-be-constructed area and the tight oil enrichment degree, and determining a target stratum setting mode according to the rock stratum state; perforation is conducted on the toe end of the horizontal well, and fracturing operation is conducted on all target layers after perforation of the toe end of the horizontal well is completed; the injection amount of CO2 fracturing fluid is determined according to the length of the reference oil-containing sandstone, and the content of a thickening agent is determined according to the reservoir pressure; if the fracture density is smaller than the preset fracture density, it is determined that the fracturing fluid adjusting mode of the rear target layer is an optimization mode determined according to the gravel particle size difference degree or adjustment is conducted according to the injection pressure of CO2 fracturing fluid according to the gravel state of the proppant; after the CO2 fracturing fluid is injected into the whole well section, the well closing time is determined according to the comprehensive reference value; and drilling and removing the bridge plug. The fracturing effect can be improved, and the exploitation efficiency of the tight oil horizontal well is improved.

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.