71 results about "Caprock" patented technology

This invention describes an apparatus and a method for integrity monitoring of a borehole and the seal integrity of a caprock suitable for sequestration of greenhouse gases. The apparatus includes plural neutrally buoyant sensors for placement outside of a casing, placement including distribution within at least mud filter cake, cement, and proppant. This invention also includes a method for monitoring integrity of a borehole suitable for sequestration of greenhouse gases or other types of well using the described apparatus.

The invention relates to a method and device for predicting the favorable distribution and growth range of a conventional tight sandstone gas reservoir. The method includes: determining the main controlling factors of the conventional tight sandstone gas reservoir in a research area, wherein the main controlling factors include a hydrocarbon kitchen, a palaeohigh, a favorable sedimentary facies belt and a regional caprock, with the hydrocarbon kitchen, the palaeohigh, the favorable sedimentary facies belt and the regional caprock appearing sequentially from the bottom up at a reservoir forming position; determining the reservoir controlling scopes of the main controlling factors; drawing a target stratum porosity planar graph; and taking the region with a porosity of less than 12% as the force balance boundary to perform restriction, superimposing the reservoir controlling scopes of the main controlling factors of the conventional tight sandstone gas reservoir on the target stratum porosity planar graph, thus obtaining the overlapping region as the most favorable growth range of the conventional tight sandstone gas reservoir. The technical scheme provided by the invention can acquire the favorable distribution and growth range of the conventional tight sandstone gas reservoir more objectively and accurately, and is of great guiding significance to exploration of conventional tight sandstone gas.

The invention discloses a high-pressure nuclear magnetic resonance CO2 geological storage model test system. A load control system is connected with a sample visualization observation system through a pipeline. A fluid control system is connected with a core holding unit in the sample visualization observation system through a fluid injection pipeline. An axial pressure sensor and a confining pressure sensor in a data collecting and processing system are installed on a pipeline connecting an axial pressure pump in the load control system with the core holding unit and a pipeline connecting a confining pressure pump in the load control system with the core holding unit respectively. A left water pressure sensor and a right water pressure sensor in the data collecting and processing system are installed on a pipeline connecting a left salt water injection pump in the fluid control system with the core holding unit and a pipeline connecting a right salt water injection pump in the fluid control system with the core holding unit respectively. An injection air pressure sensor and a flow meter in the data collecting and processing system are installed on a pipeline connecting a CO2 injection pump in the fluid control system with the core holding unit. By means of the high-pressure nuclear magnetic resonance CO2 geological storage model test system, the transport law of CO2 in reservoirs and cap rock on the conditions of different temperatures, different vertical stresses and different horizontal stresses and the deformation and fracture law of the reservoirs and the cap rock are researched.

The invention discloses a CO<2> geological storage method and a CO<2> geological storage system. The method comprises the following steps that a CO<2> reservoir stratum and a cover layer are determined according to a geological environment; a CO<2> injection well and a salt water extraction well are excavated, and the CO<2> injection well and the salt water production well both communicate with the CO<2> reservoir stratum; CO<2> is injected into the CO<2> reservoir stratum through the CO<2> injection well, meanwhile, salt water in the CO<2> reservoir stratum is extracted through the salt water extraction well, the pressure of the CO<2> reservoir stratum is reduced, and the pore available space of the CO<2> reservoir stratum is increased; and the CO<2> is stored in the CO<2> reservoir stratum in a sealed mode; According to the method, the salt water extraction well is excavated while the CO<2> injection well is excavated, CO<2> is injected into the CO<2> reservoir stratum through the CO<2> injection well, and meanwhile salt water in the CO<2> reservoir stratum is extracted through the salt water extraction well, so that the pressure of the CO<2> reservoir stratum is reduced and the pore available space of the CO<2> reservoir stratum is increased, and therefore the storage coefficient of the CO<2> reservoir stratum can be remarkably increased, and then the total storage amount of the CO<2> reservoir stratum is increased, namely, the sealing capacity of the CO<2> reservoir stratum is improved.

The invention discloses a comprehensive brittleness evaluation method of supracrustal rocks of gas storage, and belongs to the technical field of rock brittleness evaluation. Firstly, the brittleness of a collected rock sample is evaluated on the basis of brittleness evaluation methods respectively based on a stress-strain curve, hardness and mineral composition; then the weighted value of the three brittleness evaluation methods is calculated by means of a weight back analysis method based on optimization theory; finally, comprehensive evaluation on the brittleness of the supracrustal rocks of gas storage is carried out. The method effectively solves a problem of limitation of single brittleness evaluation method in the prior art and has excellent practicability and high evaluation reliability. The collected rock sample has multiple applications, so that test cost is low.

Methods and an alarming system for long-term carbon dioxide sequestration in a geologic reservoir are described. The geologic reservoir may be a water filled sandstone reservoir or a carbonate reservoir. A reservoir model is constructed to show the effects of varying injection pressures, the number of injection wells, the arrangement of injection wells, the boundary conditions and sizes of the reservoir on caprock uplift, fracture formation and fracture reactivation. The alarming system generates an alarm when caprock uplift that surpasses a threshold is detected. The injection pressures and the number of injection wells operating may be varied in response to the alarm.

The present invention discloses a method for overall exploration of a mature exploration area of oil-rich sags, the method including the following steps: building an area-wide seismic sequence framework for a study area based on uniform 3D seismic data of the study area; determining the spatial distribution characteristics of sedimentary reservoirs in the study area by sequence based on the area-wide seismic sequence framework; grading source rocks in the study area by sequence based on the area-wide seismic sequence framework; counting the spatial distribution characteristics of caprocks in the study area; determining a transporting system for the study area based on the unified 3D seismic data of the study area; classifying potential trap areas in the study area based on the spatial distribution characteristics of the sedimentary reservoirs and the spatial distribution characteristics of the caprocks; and deploying the overall exploration of the study area based on the classification of the potential trap areas, grading of the source rocks and the transporting system of the study area.

A kind of CO 2 The evaluation method of the leakage risk area during the geological storage process uses the principle of sedimentary microfacies constraint, how to obtain the rock mechanical parameters of the caprock, and select a suitable fracture pressure prediction model to evaluate the mechanical sealing of the caprock, using fine geological models and numerical values. Model, applying reservoir numerical model theory, and in-depth study of CO through the established storage volume numerical model 2 Injection process until storage for 200 years to store pressure and CO in the body 2 Dynamic changes in saturation. Using the concepts of fluid potential and potential gradient in oil and gas migration theory combined with CO 2 Saturation dynamic distribution analysisCO 2 migration direction and accumulation area, and then according to the CO in the storage body 2 The migration direction and distribution characteristics of the storage body and sand body boundary are combined to conduct lateral CO 2 Leakage risk prediction; Based on the rupture pressure distribution characteristics of the caprock and the dynamic distribution characteristics of the pressure in the storage body, CO is quantitatively studied through the proposed identification formula of the caprock rupture risk area. 2 Possible leakage risk areas longitudinally along the migration path. This method is used in low permeability reservoir CO 2 It has important practical application value to achieve safe and efficient carbon sequestration during oil displacement.

The invention relates to the technical field of oil and gas exploration, and provides a quantitative evaluation method for the vertical distribution ratio of oil and gas under the condition of fault-cap configuration; it sets evaluation faults from two perspectives of migration and preservation according to four aspects: macroscopic, microscopic, space, and time. ‑Cap (fault and caprock) configuration relationship parameters, on the basis of clarifying the degree of oil and gas enrichment in different formations of each well, determine the mathematical relationship between each parameter and the vertical oil and gas split ratio between the upper and lower caprocks, and then clarify the fault‑ The control effect of the cover configuration on the longitudinal distribution of oil and gas. The invention is suitable for research areas containing oil and gas in multi-layer systems. Under the condition that the oil and gas charging conditions, reservoir conditions and other accumulation factors are basically the same, according to the quantitative evaluation of the fault-cap configuration relationship, the vertical diversion effect of the fault-cap configuration on oil and gas, and the deployment of vertical oil and gas exploration strata are clarified. is of great significance.

The invention belongs to the technical field of petroleum exploitation, and relates to how to quantitatively estimate covering layer sealing performance in processes of carrying out a CCUS project. Acovering layer sealing performance prediction method of the Ordos basin is provided and comprises steps of selecting a production well of a to-be-estimated region, and reading the starting depth valueX1 and the thickness of a long 4+5 covering layer on a well logging curve; carrying out segmentation and fitting the interval transit time curve of the long 4+5 covering layer, and calculating the interval transit time value corresponding to the interval transit time curve; and substituting the read thickness value h and the corresponding interval transit time of the long 4+5 covering layer intoa formula, calculating a composite displacement pressure value P and evaluating the sealing performance of the covering layer by use of the P. According to the invention, the prediction method is simple and convenient; it can be avoided that a plenty of time and cost are used for obtaining horizontal displacement pressure and vertical displacement pressure through a high-pressure mercury intrusionmethod or a breakthrough pressure method; and inaccuracy caused by that fact the horizontal displacement pressure measured by the high-pressure mercury intrusion method or the vertical displacement pressure measured by the breakthrough pressure method is used as an index to measure the sealing performance of the covering layer can be avoided.

The invention discloses an optimization method and system for an exhaustion type oil and gas reservoir target region based on seismic exploration. The optimization method comprises the steps of: acquiring three-dimensional seismic data; performing horizon calibration and drilling geology recovery to obtain a seismic geologic structure interpretation scheme; establishing a speed model; performing plugging performance analysis on a fault to obtain plugging performance data of the fault; performing sealing analysis on a cover layer to obtain sealing data of the cover layer; evaluating and analyzing a target region and a well trajectory scheme of a phase storage well through coherent slices to obtain an initial target region; and selecting a target region in the initial target region according to optimal parameters to obtain a final target region. According to the optimization method and the system, the sealing performance of the target gas reservoir cover layer of a gas storage, the plugging performance of the fault and the quality and connectivity of the reservoir can be visually reflected, the target region is optimized, the problems of the sealing performance of the decisive layer and the sealing performance of the cover layer are effectively solved, meanwhile, a large crack system can be predicted, and powerful guarantee is provided for gas storage construction.

The invention proposes a method for constructing a three-dimensional conceptual model of traps and reservoirs, constructing fault lines, assigning elevation values ​​to fault lines, and using fault lines to create fault planes, converting fault planes into faults in corresponding models; creating fault-free According to the fault throws of different faults, the corresponding structural planes are constructed. According to the faults, the structural planes are divided into the structural planes of each fault block. The sandstone top surfaces of different fault blocks are combined into one structural plane. Layer top structural map; set sandstone pinch-out area, construct sandstone isopach map, use sandstone top surface and sandstone isopach map to construct sandstone bottom structural surface; use caprock top surface, sandstone top surface and sandstone bottom surface to construct three-dimensional trap structure The three-dimensional lithological attributes are constructed in the model; on the basis of the three-dimensional trap structure model, the oil-water interface is set, and the corresponding lithological attributes and fluid attributes are created. The above method can quickly and accurately establish three-dimensional trap and reservoir models.