155 results about "Overburden pressure" patented technology

Shale reactivity is evaluated by testing a preserved test plug of shale sample in a triaxial test machine, the test plug being prepared by collecting a downhole shale sample and keeping it all times immersed in a preserving mineral oil so as to avoid dehydration, then applying radial and axial pressure on the test plug surrounded by mineral oil up to equilibration to overburden pressure, the test fluid being then contacted with the sample and the interaction of fluid and sample being evaluated by axial and radial deformations as measured by a triaxial detector apparatus sensitive to vertical and radial strains occurring across the shale sample, while the shale sample is subjected to any of a set of different conditions including a temperature or thermal potential, a hydraulic potential and/or a chemical potential. Only one fluid is tested on each sample. A sister test at ambient temperature and atmospheric pressure is run in order to constitute a visual counterpart of what is occurring in the triaxial test machine.

The invention relates to an oil deposition steam injection thermal recover multi-mode linkage three-dimensional simulation system. The system comprises a steam injecting system, an oil deposit model body, a burden pressure system, and a data acquiring and graph processing system, wherein the oil deposit model body is used for simulating an actual oil deposit; and the oil deposit model body comprises a shell of an oil deposit model, a heat insulating layer, a simulative oil deposit, a simulative straight well, a simulative horizontal well, a pressure guiding pipe, and a thermocouple and an interface of the thermocouple. The technical proposal realizes the simulation of steam thruput elastic energy, and the design of high-temperature and high-pressure oil deposit model body meets the requirements of well networks and well types for various assemblies.

The invention relates to a computed tomography (CT) scanning heterogeneous model testing system. The system comprises a CT scanning system, a displacement system, an overburden pressure system, a pressure measurement system, a heterogeneous multilayer core clamp holder and a metering system, wherein the heterogeneous multilayer core clamp holder consists of a shell, a rubber cylinder, a core left plug, a core right plug, a left fixing sleeve, a right fixing sleeve, a left fastening sleeve, a right fastening sleeve and a fixed bracket; the core right plug is provided with a plurality of liquid outlets; each liquid outlet is respectively aligned with one layer of core model; and a strip liquid outlet sealing gasket is formed on the core right plug, which correspond to a seam between two adjacent layers of core models, so that liquid flow passing through each layer of core model flows out from the corresponding liquid outlet of each layer of core model, and thus, intraformational heterogeneous water displacing oil layered measurement is realized. By the CT scanning system, the real-time on-line monitoring of the on-way distribution of saturation of fluid on each layer section in a heterosphere is realized so as to observe the interlayer communication phenomenon.

The invention relates to a diagenesis simulation experimental apparatus and method. The diagenesis simulation experimental apparatus comprises a rock core clamping mechanism, a heating mechanism, a gas porosity and permeability measurement process, a liquid injection and liquid permeability test process, an automatic continuous outlet-fluid metering and sampling mechanism, a burden pressure boost control mechanism, a fluid physical property detection mechanism and a data acquisition-calculation and automatic control mechanism, wherein, the inlet and outlet of the rock core clamping mechanism are respectively connected with the gas porosity and permeability measurement process and the liquid injection and liquid permeability test process; the heating mechanism is sheathed at the periphery of the rock core clamping mechanism, and the burden pressure injection port of the rock core clamping mechanism is connected with the burden pressure boost control mechanism; the outlet of the liquid injection and liquid permeability test process is connected on the automatic continuous outlet-fluid metering and sampling mechanism; the fluid physical property detection mechanism detects a fluid sample of the automatic continuous outlet-fluid metering and sampling mechanism; and the data acquisition-calculation and automatic control mechanism acquires, records, stores and calculates temperature, pressure and flow rate in an experiment and meanwhile controls operation of the corresponding solenoid valve and the automatic continuous outlet-fluid metering and sampling mechanism according to the experimental status.

The invention discloses a method and device for testing rock drillability of deep well drilling and extra-deep well drilling. The device comprises a machine frame (1), a high temperature and high pressure loading mechanism and a micro drill bit rock breaking drilling depth measurement mechanism, wherein the high temperature and high pressure loading mechanism and the micro drill bit rock breaking drilling depth measurement mechanism are arranged on the machine frame (1). The device exerts confining pressure, pore pressure and fluid column pressure on rock samples in cavities in three axes, overburden pressure is exerted on the rock samples through a hydraulic pump, and therefore the high pressure environment of the stratum of the bottom of a well can be simulated, the relation between the drilling depth and the time is tested through a displacement sensor at the position of a micro drill bit, optimization of the drilling pressure, the rotating speed and the drilling fluid type and drilling machinery drilling speed prediction are achieved. The method and the device have the advantages that the requirements for the bottom hole temperature and the pressure can be met in the deep well drilling process and the ultra-deep well drilling process, the function of testing multiple sets of rock drillability values through a single time of experimental testing of deep well drilling is achieved, the efficiency of the single time of experimental testing is greatly improved, and experimental cost is reduced.

The invention relates to an intraformationally heterogeneous model testing system. The rubber cylinder of a multilayered core holder is arranged in a shell; a left core pressing head and a right core pressing head are pressed to the two ends of a multilayered core model; a core accommodating chamber for accommodating the multilayered core model is formed among the inner wall of the rubber cylinder, the left core pressing head and the right core pressing head; a closed annular confining pressure room is formed among the outer wall of the rubber cylinder, a left fixing sleeve, a right fixing sleeve and the inner wall of the shell; the shell is provided with a confining pressure interface which is communicated with the annular confining pressure room and an overburden pressure system; a liquid inlet is formed in the left core pressing head and is communicated with a displacement system and the core accommodating chamber by a pressure measurement system; a liquid outlet is formed in the right core pressing head and is communicated with the core accommodating chamber and a metering system; and a strip liquid outlet gasket corresponds to a joint between two adjacent layers of core models on the right core pressing head, so that flowing liquid which passes through every layer of core model flows out of the liquid outlet of the corresponding layer. The system can accurately reflect the changing law of intraformationally heterogeneous oil-water displacement in mixed water injection layer mining.

The invention discloses a method for testing gas-water relative permeability of a dense core. The method comprises the following steps: (1) preparing an experimental core, measuring the porosity and the klinkenberg permeability of the core, and determining the minimum return pressure of weakening a slippage effect; (2) establishing water saturation in the core by utilizing formation water or simulation formation water; (3) arranging the core in a core holding unit, applying confining pressure to the original effective stress or reservoir overburden pressure and constant displacement pressure p1, applying return pressure p2 at the core outlet, and measuring the gas flow of the core; (4) measuring the gas flow of the core under different water saturations, and calculating the gas-phase effective permeability and gas-phase relative permeability of the core; (5) establishing 100 percent of water saturation in the core, and measuring the accumulated water yield of the core in unit time; and (6) calculating the water-phase effective permeability and water-phase relative permeability of the core. The method disclosed by the invention can be used for really reflecting the gas seepage conditions under in-situ conditions and simulating the underground production state and has wide market prospects.

The invention discloses a method for measuring overburden porosity with water in permeation fluid mechanics experiment. The method comprises the following steps of: adding ambient pressure around the core with known pore volume; injecting the single-phase fluid with known compression coefficients into the core in a saturated manner, and enabling pressure at the two ends of the core to conform to the actual conditions of the stratum; and then, sequentially increasing the ambient pressure, and sequentially measuring the change of pore pressure in the core after the ambient pressure is increased so as to determine the change of pore volume and determine the porosity change under an overburden condition. The measuring method disclosed by the invention is applicable to the overburden porosity research in the field of low-permeability and ultralow-permeability storage layer stress sensitive research; and the method can realize overburden porosity research on rock while simulating the overburden pressure on a real storage layer, pore pressure and real fluid parameters. The test equipment adopted by the method is simple, and the test principle is clear; and compared with the method for measuring overburden porosity with air, the effective porosity measured by the method disclosed by the invention can better reflect the overburden porosity characteristics of the real storage layer, and quantitative research on the overburden porosity of the storage layer can be realized.

The invention discloses a pile-soil interface shear test device capable of simulating change of an overburden pressure. The device comprises a round model box, a loading plate, a counter-force beam and a servo loading motor. The round model box is composed of a round frame and a base. Sandy soil at a certain density fills the model box, and a soil pressure sensor is placed in the sandy soil to test the vertical and horizontal soil pressures; the loading plate is placed on the upper surface of the sandy soil layer to apply the counter-force by means of a jack; the servo loading motor can be in two loading modes: displacement control and load control; a model pile at the center of the model box is loaded by means of the servo motor, and in the loading process, the load and displacement applied by the servo motor can be automatically collected. The device disclosed by the invention is reasonable in structure and simple to operate, and can be used for researching the frictional properties of the pile-soil interface under different overburden pressures, thereby providing an effective means for researching the frictional property of the pile-soil interface.

The invention relates to a coal rock porosity, permeability and electroacoustic stress-strain combined measuring device under overburden pressure and heating. The coal rock porosity, permeability and electroacoustic stress-strain combined measuring device is provided with an incubator, wherein a supporting rod, a comprehensive gripper, a pushing platform, a cushion block and a coal sample are arranged in the incubator, the upper part of the comprehensive gripper is provided with an experimental oil pipe, the experimental oil pipe is inserted into the coal sample, the upper part of the experimental oil pipe is sequentially connected with an electromagnetic valve e, a standard chamber, a pressure gauge b, an electromagnetic valve c, a barometric regulator and a gas booster pump, an inlet of the gas booster pump is communicated with a gas cylinder through a lead wire, and the upper part of the experimental oil pipe is sequentially connected with a pressure gauge c, an electromagnetic valve d, a water pressure regulator, a liquid booster pump and a water tank. The coal rock porosity, permeability, and electroacoustic stress-strain combined measuring device can be used for effectively simulating the high temperature and high pressure geological environment under deep complicated formation conditions to obtain the porosity, the gas-water relative permeability, a stress-strain curve, the resistivity and the acoustic velocity of the coal rock sample under the same experimental conditions, thus effectively saving the sample, improving the accuracy and the comparability of experimental data, and bringing the great convenience for scientific research.

The invention discloses a large-scale piping testing apparatus capable of simulating overburden pressure of soil, which comprises a test tank, a variable head water tank, a water inlet pipe, a plurality of osmometers, a water outlet pipe and a turbidity meter. The test tank is divided into an upstream buffer area, a test sample area and a downstream buffer area by an upstream porous board and a downstream porous board, wherein a test sample is disposed in the test sample area. The variable head water tank is connected with a water inlet of the upstream buffer area of the test tank through the water inlet pipe. The osmometers are disposed in the test sample as required. The water outlet pipe is disposed at a water outlet of the downstream buffer area, and the turbidity meter is disposed on the water outlet pipe. A steel backing plate capable of sliding up and down is disposed on the upper surface of the test sample. A safety air bag is arranged above the steel backing plate and connected with a pressure source through a pipeline, and a pressure regulating valve is disposed on the pipeline. The large-scale piping testing apparatus integrating the advantages of existing piping testing apparatuses is capable of truly simulating the process of piping development of a large-scale test sample bearing overburden pressure under the coupling action of seepage stress.

The invention discloses a method for measuring the content of free gas in coal bed gas. By calculating the surface water saturation of a fresh coal core and performing back calculation to obtain water saturation in the stratum state, the volume of the free gas in a coal rock of unit mass is measured. Preferably, the method comprises the following steps of: collecting a sample, namely collecting a cylindrical coal sample which is not polluted by drilling fluid; measuring the volume Vtotal of the coal sample; measuring the volume Vwater1 of initial water; measuring the volume Vwater2 of saturated water; measuring an effective burden pressure delta p and a volume coefficient B; and according to parameter results in the preceding steps, calculating the content of the free gas. By adoption of the method, the content of the free gas can be accurately measured, so a total gas content test result is approximate to an underground true value, and great significance is provided for exploration and development of the coal bed gas.

The invention discloses a full-size well wall stable simulator. The full-size well wall stable simulator comprises a sealing rubber sleeve (18) arranged outside a rock core in a sleeved mode. The two ends of the sealing rubber sleeve (18) are respectively provided with an axial load piston. A well wall visual and imaging system and a stratum sliding wave sound velocity test system are arranged in the axial load pistons. A high-temperature autoclave body (28) is arranged outside the sealing rubber sleeve (18) in a sleeved mode. A confining pressure inlet (29) is connected with a confining pressure adjusting system. The upper axial load piston (6) and the lower axial load piston (7) are connected with a high-pressure pipeline connecting high-pressure mud circulating system and a high-pressure pipeline connecting pore pressure system respectively. The upper axial load piston (6) is further connected with an overburden pressure control system. The full-size well wall stable simulator has the advantages that the subsurface environment can be more vividly simulated, the well wall stable condition can be dynamically evaluated, circulating media can be changed, optimization of a drilling method and a drilling liquid system is facilitated, the near well wall stratum permeability and the rock sound wave characteristic can be comprehensively evaluated, well wall imaging is achieved, observation is more visual, and practicability is high.

A multimode linkage three-dimensional proportion simulation system of steam injection for thermal recovery of an oil reservoir comprises a steam injection system, a reservoir model body, an overburden pressure system and a data acquisition and graphic system; wherein, the overburden pressure system consists of a spherical pressure tank, a triple pump, a relief valve, an electrical heating component and temperature control interfaces and various pipeline interfaces thereof as well as corresponding connecting pipelines and valves. The technical proposal solves simulation of steam throughput elastic energy and the unique design of a cap layer, a bottom layer and the overburden pressure system ensures transmission of heat to the cap layer and the bottom layer, simulation of mass transfer and control of the overburden pressure during steam injection for thermal recovery of an oil layer.

The invention discloses a sealed shale gas flow testing method and device. The method includes the following steps that shale gas reservoir rock is collected, a natural core is manufactured, physical property parameters are tested, and gas reservoir static feature parameters are collected; a simulation device is installed to fill the core; the device is vacuumized, the device is filled with natural gas till formation pore pressure (formation pressure) confining pressure is gas reservoir overburden pressure; the temperature of a constant-temperature box is increased to a specific temperature; the experimental process starts; pressure difference generated during seepage of gas in the core under different flows is tested under an original formation condition, and a seepage feature curve is drawn. Shape gas flow seepage characteristics in the gas reservoir development process are researched through a physical simulation method, and seepage capacity of shale gas is measured.

The invention relates to a method for determining stress sensitivity of a fractured low-permeability reservoir based on a scale model. According to the method, the scale model of the stress sensitivity of the fractured compact reservoir is obtained by using a rock mechanics analysis method and a medium series-parallel model. Factors such as core size, underground flowing size, fracture density, fracture occurrence and ground stress are taken into account in the scale model. A pore type core and a fractured core are tested in a stress sensitivity experiment respectively, and the stress sensitivity experimental law of the small-sized pore type core and of the fractured core is obtained by the scale model, so that the actual reservoir large-range flowing law is deduced. Besides, the method shows that effective stress in a stress sensitivity model cannot be simply equal to effective stress of a reservoir (burden pressure-pore pressure), but is equal to normal effective stress of a fractured surface. The stress sensitivity scale model provided by the invention can be used for predicting capacity, and the method is a novel method for researching capacity calculation for fractured compact reservoir horizontal wells, multi-branch horizontal wells and staged fracturing horizontal wells.

Methods for sealing undesirable transverse fractures enlarged and/or created during lithological displacement of an underground water-soluble evaporite stratum by hydraulic pressure greater than overburden pressure at an evaporite/non-evaporite strata interface, comprising injecting and maintaining a sealing agent into these undesirable fractures to form a solidified matter in situ and ultimately seal them, while forming a main free surface at the interface suitable for initiating solution mining of the evaporite stratum. The solidified matter may be crystallized, precipitated, compacted, agglomerated, cross-linked, coagulated, water-swollen, and/or cemented matter, or may include a wall-building matter with the mineral on fracture faces. The sealing agent may comprise at least one component of the mineral and/or the non-evaporite. The evaporite stratum is preferably a trona stratum overlying an oil shale stratum. The sealing agent may comprise dissolved and/or solid trona, trona tailings particles, and/or water-swelling particles.

The invention provides a stratum stress sensitive experiment testing method and device. The method comprises the following steps: (1) obtaining actual geological data; (2) selecting a formula for calculating a reservoir stratum pressure arch ratio according to a shape of a reservoir stratum and dynamic property difference of the reservoir stratum and surrounding rock; (3) determining initial reservoir stratum pressure and initial overburden pressure of reservoir stratum rock; (4) determining a change relation of confining pressure and driving pressure along return pressure; (5) recovering a rock core with undeveloped natural fractures to an original confined water saturation degree; (6) carrying out ageing treatment on the rock core; (7) recovering original stress and fluid pressure of the rock core; (8) simulating stress sensibility of the reservoir stratum in an exploitation process; (9) processing and analyzing data. According to the stratum stress sensitive experiment testing method and device, a quantitative change relation of the overburden pressure of the reservoir stratum along pore pressure in an oil-gas reservoir development process can be obtained according to the actual geological data of oil-gas reservoirs.

The invention provides an indoor drilling simulation device in a multi-factor environment and an evaluation method, and belongs to the technical field of influences of drilling fluid treatment agentsand drilling fluid systems on the drilling speed in drilling engineering. The indoor drilling simulation device comprises a rock core clamping system, a shaft bottom circulating system, an overburdenpressure system, a formation pressure system, a drilling pressure simulation system, a rotary driving system, a drilling depth measuring system and an automatic control and data acquisition system. The rock core clamping system is a sealing device for clamping rock cores and is used for simulating the downhole pressure and the temperature environment. The shaft bottom circulating system, the overburden pressure system, the formation pressure system, the drilling pressure simulation system and the rotary driving system are connected with the rock core clamping system through pipelines. The drilling depth measuring system is connected with the drilling pressure simulation system. The automatic control and data acquisition system is connected with the rock core clamping system, the shaft bottom circulating system, the overburden pressure system, the formation pressure system, the drilling pressure simulation system, the rotary driving system and the drilling depth measuring system throughcircuits.

The invention provides a method and a device for determining the stress sensitivity of reservoirs. The method includes determining body effective stress borne by rock frameworks of the to-be-detected reservoirs according to overburden pressures, porosity parameters and formation pore fluid pressures of the to-be-detected reservoirs; determining the types of the to-be-detected reservoirs according to physical property analysis results of the to-be-detected reservoirs; selecting corresponding stress sensitivity models according to the types of the to-be-detected reservoirs; combining the body effective stress and the selected stress sensitivity models with one another and determining the stress sensitivity of the to-be-detected reservoirs. The method and the device in an embodiment of the invention have the advantages that the stress sensitivity degrees of the reservoirs are determined by means of comprehensively utilizing processes for changing the formation pore fluid pressures and changing the overburden pressures, accordingly, the shortcomings due to the fact that the stress sensitivity degrees of existing reservoirs are determined by means of only changing existing formation pore fluid pressures or only changing existing overburden pressures can be overcome, the ultimately determined stress sensitivity degrees of the reservoirs are high in precision, and the method and the device have guiding significance in efficient development of oil and gas reservoirs.

The invention relates to a rough crack flow guide capability test experiment device and a test evaluation method, wherein a test rock sample is put in a flow guide cavity of the rough crack flow guide capability test experiment device; artificial cracks with the fractal features and a certain surface roughness degree are cut in the test rock sample; a loading top plate is arranged on the upper part of the flow guide cavity; a seam width measuring device and a displacement sensor are arranged at the lower part of the flow guide cavity; a platform with a roller set is arranged on the base; the flow guide cavity is fixed on the base; the loading top plate is pressurized; the base is used for supporting; the loading on the upper covering pressure of the test rock sample can be jointly completed; a liquid feeding loading block and a liquid discharging loading block are arranged at the two sides of the flow guide cavity; a closing pressure loading block and a closing pressure regulating device are arranged at the front end and the back end of the flow guide cavity; the flow guide cavity is provided with a direction change loading block; the closing pressure loading block, the closing pressure regulating device and the direction change loading block are matched for completing the loading of the crack closing pressure. The device and the method provided by the invention realize the quantitative evaluation and analysis of the crack wall surface roughness on the flow guide capability.

The invention provides a method and a device for detecting adsorption parameters of tight reservoir adsorbed state crude oil. The method comprises the following steps: acquiring and generating a test rock sample, and testing and acquiring the oil content W1 of the test rock sample; drilling a plunger rock sample from the test rock sample so as to test the overburden pressure properties, acquiring the porosity Phi, and acquiring the oil saturation So according to the oil content W1 and the porosity Phi; performing oil scrubbing treatment on the tested rock sample, and generating an oil scrubbing rock sample; generating a pore size-pore volume distribution curve of the oil scrubbing rock sample by virtue of a high-pressure mercury intrusion method, and determining the lower limit Rm of the oil content according to the oil saturation So; performing nanometer CT imaging test on the oil scrubbing rock sample, and determining the isolated pore surface area Sc; grinding the oil scrubbing rock sample, testing the specific area distribution of pores by utilizing N2 adsorption, determining the specific surface area SN of the pores, and generating the effective pore area S; testing according to a QCM-D instrument, and generating the density pa of the adsorbed crude oil and the adsorption quantity Ka of the tested rock sample in unit area; and finally generating the adsorbed oil quantity W and adsorbed oil ratio Wa of the tested rock sample according to the parameters.

The invention relates to an experimental facility and an experimental method for evaluating steam reforming feature of reservoir rock. The experimental facility comprises a model system, a steam injection system, a steam recovery system, a confining pressure control system, an overburden pressure control system, a vacuum pumping system, a fluid analysis system and an image acquisition and analysis system. Steam is injected from a steam chamber to provide a high-temperature high-pressure contact environment for the overall-diameter core bottom subjected to coring actually, a steam monitoring chamber provides an actual oil reservoir overburden pressure to simulate reforming effect of steam to an upper core pore structure of a steam injection well and dissolution to intercalation core during the actual process of injecting steam into oil reservoirs. Core top fluid in the steam monitoring chamber is sampled and analyzed, so that steam breakthrough conditions of different core samples are monitored in time. The core is scanned by means of industrial CT (computed tomography) imaging in time, so that dissolution and breakthrough conditions of the different core samples on different steam injection conditions are analyzed, and key operation parameters are provided for steam injection development of great quantities of inhomogeneous oil reservoirs developed from the intercalation.

The invention discloses an overburden pressure loading device applied to a geotechnical vibration table test. The overburden pressure loading device comprises a model box, an air bag, an air source and a pressing cover, wherein the air bag is arranged inside the model box and is connected with the air source by virtue of a pipeline; the pressing cover covers an opening of the model box and is fixedly connected with the wall of the model box. By virtue of the overburden pressure loading device applied to the geotechnical vibration table test, the depth of foundation soil researched in an existing vibration table test can be effectively expanded, and thus technical support is provided for deeply researching the dynamic characteristics of deep soil.