63 results about "Hydrostatic pressure" patented technology

The invention discloses a salt-cavern gas storage sealing performance evaluation method based on gas-water two-phase seepage, and belongs to the technical field of salt-cavern gas storages, the method comprises the following steps: embedding a formula in a fluid-solid-gas coupling theoretical model under a saturated water surrounding rock gas injection and production condition into finite element software, inputting mechanical parameters and pore permeability parameters of rock, and calculating the sealing performance of the salt-cavern gas storage according to the mechanical parameters and the pore permeability parameters; the correction coefficient of the slippage effect on the gas permeability, the gas relative permeability and the pore water relative permeability are obtained; based on the initial stress of surrounding rock, corresponding stratum stress values and hydrostatic pressure values are applied to the top, the bottom and the side faces of a rock stratum respectively, an injection-production air pressure boundary is applied to the surface of a salt cavern cavity, numerical simulation is carried out through a fluid-solid-gas coupling theoretical model and parameters, and the gas seepage velocity is obtained through solving. And evaluating the cumulative gas leakage rate in combination with the cumulative gas leakage rate model. According to the method, the gas seepage behavior under the real working condition is simulated, the slippage effect of the small molecule gas and the gas-water displacement process of the water-saturated rock stratum are considered, and the gas leakage amount evaluation is more accurate.

The anti-rotation flow guide integrated radial seal comprises an anti-rotation flow guide structure and a plurality of sealing teeth, the anti-rotation flow guide structure and the sealing teeth are sequentially arranged on the inner surface of a sealing stator in the flowing direction, the anti-rotation flow guide structure is installed at an inlet of the sealing stator, high-speed circumferential rotational flow caused by pre-rotation of an air inlet can be weakened, and the anti-rotation flow guide effect is improved. And the pressure distribution between the air inlet and the adjacent sealing teeth of the anti-rotation flow guide structure can be changed, so that the excitation is reduced, and the leakage rate is reduced. Wherein the spiral line type anti-rotation flow guide structure is composed of a plurality of spiral flow guide plates distributed in the circumferential direction, a millimeter-level spiral deep groove area is designed at an inlet, the flow pattern of airflow is changed through the hydrostatic pressure effect, the circumferential rotational flow velocity of the surface of the rotor is reduced, and the kinetic energy dissipation of the airflow is increased. Or the spiral line type anti-rotation flow guide structure is a boss with a spiral flow guide groove, a reasonable groove type structure is designed according to the rotation direction of the rotor and the working condition so as to change the pressure distribution of the airflow, and the throttling and flow guide effects are achieved.

The invention belongs to the technical field of industrial automation control, and relates to a seasoning filling PID parameter adaptive optimization control method and system. The method comprises the steps that the real-time temperature of fluid in a filling pipeline, the static pressure of a valve inlet, the instantaneous flow and a valve opening instruction are collected, and moving average filtering preprocessing is carried out; constructing a self-adaptive forgetting factor calculation model based on the viscosity-temperature characteristics, and calculating a current optimal forgetting factor according to the fluid temperature change rate, the flow prediction error and the fluctuation condition of the flow data; a recursive algorithm is used for identifying the system process gain online, and the proportional gain of a PID controller is calculated in real time according to the identified process gain and the ratio of the hydrostatic pressure to the standard reference pressure; and the gain is input into a controller, and a final valve opening instruction is generated in combination with integral and differential terms. According to the method, the dynamic adjustment of the algorithm memory length can be realized, the viscosity change can be quickly adapted, excessive filling and slow response are eliminated, and high-precision filling under complex working conditions is ensured.

The invention relates to the technical field of water conservancy projects, and discloses an estuary channel erosion and deposition control method and system based on water column wave energy collection and release. According to the method, wave energy is captured through an oscillating water column air chamber with a bottom opening, bidirectional airflow is converted into unidirectional high-pressure airflow through an airflow rectifying unit, and the unidirectional high-pressure airflow is stored in a high-pressure energy storage container; the system monitors the flow velocity of a channel and the air pressure of the energy storage container in real time, only when the flow velocity meets a preset ebb tide transportation condition and the air pressure is higher than a critical threshold value, a trigger instruction is generated, after the instruction is responded, high-pressure gas is injected into the gas-liquid replacement excitation cavity sinking to the bottom, and water in the driving cavity forms high-speed hydraulic jet flow through a Laval nozzle to impact bottom mud. After jet flow is finished, the cavity exhausts air and relieves pressure, the external water body reversely flows back through the hydrostatic pressure of the environment, and suspended sediment is entrained and sucked. Through the cyclic operation, energy self-sufficiency, intelligent opportunity selection operation and efficient dredging are achieved, the operation cost and the environmental influence are reduced, and the method is suitable for remote and unattended navigation channel maintenance.

A downhole apparatus with an internal surface defining a cavity. The cavity houses one or more sealed packs containing chemicals used in wellbore operations. The downhole apparatus optionally includes either fluid ports to equalize the wellbore pressure or one or more compensating pistons for adjusting the volume of the cavity in response to wellbore conditions such as temperature or hydrostatic pressure. The chemicals are released into the wellbore when the downhole apparatus is milled or when the sealed packs are dissolved.

The present invention discloses a method for calculating the starting pressure and circulating gas supply pressure of gas lift reverse circulation drilling, comprising the following steps: S1. calculating the hydrostatic pressure at the bottom of the inner tube of a double-wall drill pipe; S2. calculating the friction loss pressure of the compressed air in the outer annulus of the double-wall drill pipe; S3. calculating the friction loss pressure of the compressed air flowing through the surface gas transmission channel; S4. calculating the local pressure loss of the compressed air from the outer tube of the double-wall drill pipe through the orifice on the gas-liquid mixer; S5. calculating the friction pressure loss of the liquid phase flow in the inner tube of the double-wall drill pipe; S6. calculating the friction pressure loss of the liquid phase flow in the slag discharge pipeline; S7. calculating the three-phase flow pressure drop in the inner tube of the double-wall drill pipe; S8. calculating the starting pressure and circulating gas supply pressure. The method for calculating the starting pressure and circulating gas supply pressure of gas lift reverse circulation drilling of the present invention can accurately and conveniently calculate the starting pressure and circulating gas supply pressure of gas lift reverse circulation drilling by accurately calculating the pressure of each part of the gas lift reverse circulation drilling process, providing a theoretical basis for the stable and efficient operation of the circulation system.

This invention relates to a method for evaluating the escape rate of shale gas reservoirs with different dip angles, employing the following technical solution: including the following steps: Step (1) Calculate the drilling angle θ of the plunger sample based on the shale bedding type, calculate the length L of the plunger sample based on the plunger diameter d, and drill the plunger sample based on the drilling angle θ and length L; Step (2) Test the minimum starting pressure P0 of the plunger sample using methane gas; Step (3) Calculate the fluid pressure P of the formation where the plunger sample is located. 流 hydrostatic pressure P 水 Minimum starting pressure P0 and static rock pressure P 岩 Calculate the test pressure Δ for permeability testing p and confining pressure P 围 Step (4) is performed according to the test pressure P determined in step (3). 测 and confining pressure P 围 The permeability of the plunger sample is tested to obtain the permeability k; step (5) calculate the gas escape rate R; step (6) evaluate the shale gas escape capacity of the layer where the sample is located based on the gas escape rate R. The larger the escape rate R is, the stronger the shale gas escape capacity is. Then calculate the shallowest burial depth H where the layer where the sample is located can be effectively preserved.

A method (200) of determining a progress of separation of particles suspended in a liquid in a container (110) of a separation apparatus (100), wherein: said particles are separated from said liquid by sedimentation; said separation apparatus (100) compri- sing a container (110) with a feed inlet and a rotatable rake (120) at its bottom (114); a motor (126) for driving said rake (120); and a pressure measuring device (130), for measuring a hydrostatic pressure at or near the bottom of said container said method (200) comprising: measuring (210) said hydrostatic pressure; driving (220) said rake (120) by means of said motor; obtaining (230) at least one load parameter of said motor (126) during said driving of said rotation; determining (240), especially in real time, a status indicator relating to said separation process, as a function of said hydrostatic pressure and said load parameter, wherein said status indicator comprises: a sedi- mentation index, especially wherein the sedimentation index is indicative of the separation of said particles from said liquid, and / or a feed solid content index, wherein the feed solid content index is indicative of the solid content supplied by said feed.

The utility model relates to an anti-blocking device for a drain loop of a surge tank. The anti-blocking device comprises the surge tank, the condenser is communicated with the pressure equalizing box through a first drainage pipeline; the throttling assembly is arranged on the first drainage pipeline; the second drainage pipeline is connected with the throttling assembly in parallel; and one end of the third drainage pipeline communicates with the first drainage pipeline, and the other end of the second drainage pipeline communicates with the condenser. Two drainage pipelines are additionally arranged on the basis of an original surge tank drainage pipeline, one drainage pipeline is connected with a throttling assembly arranged on the original drainage pipeline in parallel, and therefore when the throttling assembly is blocked in the operation process, pipeline switching can be conducted in time, and smooth drainage is guaranteed; one end of the newly-added drainage pipeline is connected with the original drainage pipeline, the other end of the newly-added drainage pipeline is connected with the position above the liquid level of the condenser, the height of the connecting position of the drainage pipeline and the condenser is correspondingly increased, and the influence of hydrostatic pressure in the condenser on drainage is avoided.

The application provides a multifunctional waterproof structure water vapor permeability comprehensive test device. It belongs to the technical field of building material water vapor permeability testing. The non-uniform water pressure simulation and application system can truly simulate the triangularly distributed hydrostatic pressure borne by the wall in underground engineering through the cooperative design of the tiltable rigid support frame and the pressurized liquid. The test piece installation and inclination adjustment system can simulate the underground continuous wall or the slope retaining wall with different inclinations by adjusting the inclination of the rigid support frame. The non-uniform water pressure simulation and application system can simulate various groundwater conditions from low water level to high water level by adjusting the set value of the fluid pressure system. It can cover various liquid water permeation scenarios, has wide test range and strong applicability. The environment simulation and moisture permeability test system can realize the integrated test and flexible switching of the liquid water barrier and the gaseous water migration performance, complete the test of the two modes on the same test piece in turn, has strong data comparability and high test efficiency.

This invention relates to the field of water purification equipment monitoring technology, and particularly to a multimodal liquid level monitoring method and system based on time-series feature analysis. The method includes: collecting and preprocessing multi-dimensional data through sensors to obtain the original pressure value, real-time water temperature value, real-time TDS value, and current operating condition indicator after interference removal; inputting the original pressure value and water density basic parameters into the hydrostatic pressure formula to obtain the initial liquid level value; combining the real-time water temperature value, real-time liquid level fluctuation frequency, and reference fluctuation frequency to obtain the final high-precision liquid level value; based on the final high-precision liquid level value, real-time TDS value, inlet water pressure data, and current operating condition indicator, calculating the flow rate attenuation score, TDS stability score, and correlation score according to weighted and threshold rules, and combining the three scores to obtain the overall health score; calculating the liquid level change rate and comparing it with a standard range, determining and outputting the anomaly type, and generating control commands. This solution improves the accuracy of liquid level measurement through multi-dimensional liquid level compensation.

The invention discloses a hydrostatic pressure chamber with a degassing device connected at its highest point. The degassing device is connected via a throttle to a tank or to a pressureless leakage area of a hydraulic system in which the pressure chamber to be degassed is arranged.

The invention relates to a liquid lifting device, and belongs to the field of new energy technology and liquid conveying. The device comprises two pumping and storing units which are symmetrically arranged, a linkage mechanism and a supporting frame. Each pumping and storing unit is composed of a vertically fixed inner cylinder and a movable outer cylinder coaxially arranged outside the inner cylinder in a sleeving mode, a liquid inlet one-way valve is arranged at the bottom of the inner cylinder, and a piston linked with the outer cylinder is arranged in a cavity of the inner cylinder; a liquid discharge pipe with a liquid discharge one-way valve penetrates between the piston and the top of the outer cylinder; a gap between the outer cylinder and the inner cylinder is filled with liquid to form a gravity compensation body. The linkage mechanism comprises a crankshaft and a connecting rod assembly with the phase difference of 180 degrees, the two outer barrels are driven to alternately ascend and descend, when the outer barrels ascend, the liquid inlet valve is opened for liquid storage, when the outer barrels descend, the liquid drainage valve is opened, and the crankshaft is assisted to do work through gap liquid gravity. According to the design, gravitational potential energy recycling is achieved through hydrostatic pressure transmission, the energy consumption for lifting liquid (such as water) from the low position to the high position is remarkably reduced, and the device is suitable for new energy storage systems, irrigation projects and any scene where liquid needs to be lifted from the low position to the high position.

An apparatus for providing pressure to a sample. The apparatus comprises a housing having a cavity, an elastomer within the cavity, and a means for providing pressure to the elastomer within the cavity. The housing and the elastomer are configured to allow a sample to be inserted into the cavity, such that the sample is surrounded by the elastomer and such that the elastomer and the sample together fill the cavity.

The invention discloses a device for detecting water pressure outside a tunnel lining and a drainage capacity evaluation method. The method comprises the following steps: constructing a multi-source associated basic data set based on original data collected by a portable device; generating a data stability evaluation result by using time sequence stability evaluation and working condition correlation analysis, and screening a credible test section; a self-adaptive multi-working-condition response model is constructed, and a working-condition external water pressure field is reconstructed and designed through weighted regularization inversion; constructing an external water pressure and drainage capacity coupling model, and performing inversion to generate equivalent drainage capacity parameters by using a global optimization algorithm of proxy model acceleration and spatial smooth constraint; and finally, comprehensively outputting a structure safety evaluation suggestion. The real hydrostatic pressure is obtained through the sealed inverted filter structure of the device, the problems that short-term data interference is large, working condition extrapolation is difficult and inversion is discontinuous are solved in combination with a space coupling inversion algorithm, and high-precision reconstruction of external water pressure and whole-line diagnosis of drainage performance are achieved.

The invention relates to a deep sea power push rod testing device and method, and relates to the technical field of deep sea equipment, and the device comprises a power push rod, a channel control module, a pressure balance cylinder, a storage cylinder and a hydrostatic pressure tank; the access control module is provided with three conduction ports, and the three conduction ports are connected with the power push rod, the pressure balance cylinder and the storage cylinder correspondingly. Three conduction ports of the access control module are controlled by electromagnetic valves; the hydrostatic pressure tank is used for providing preset working water pressure; when the electromagnetic valve is powered on to act, the pressure balance cylinder communicates with the power push rod, liquid in the pressure balance cylinder is pressed into the power push rod based on the working water pressure of the hydrostatic pressure tank, and a telescopic rod of the power push rod is pushed outwards under the action of the internal and external pressure difference. When the electromagnetic valve is powered off, the storage cylinder communicates with the power push rod, and the telescopic rod of the power push rod retracts under the action of external working water pressure and presses liquid in the power push rod into the storage cylinder.

This invention discloses a method for predicting formation pore pressure in fractured reservoirs, relating to the fields of oil and gas exploration and development and geophysical logging technology. The method includes obtaining logging and geological parameters of the target formation; establishing a relationship between pore pressure and fracture aspect ratio based on the effective stress principle and fracture mechanics; calculating the theoretical P-wave velocity under different pore pressure conditions within a pressure range defined by hydrostatic pressure and normal stress on the fracture surface, using an equivalent medium model and the Gassmann equation; determining the pore pressure based on the residual between the theoretical and measured P-wave velocities; and comparing the calculated pore pressure value with the measured pressure value to establish an evaluation relationship. This invention has the advantages of reducing unnecessary and ineffective calculations, improving the stability and speed of the calculation process, and enhancing the physical rationality of the results.

Safety valves and methods of using safety valves. The safety valve is installed in a wellbore with hydrostatic pressure. The safety valve is configured to operate at the pressure of the production tubing well. The pressure is applied to the safety valve using a single control line. The safety valve uses an accumulator in fluid communication with the control line, so that the pressure acting on the accumulator is fluidly connected to the pressure in the control line. The safety valve is insensitive to hydrostatic pressure. Figure for abstract: Figure 1

A device, system and method for precise and reliable monitoring and control of fluid levels within wastewater vessels are provided The device comprises a tubular probe with a submerged end and a reading end. A pressure generating unit exerts brief, high-intensity pressure bursts exceeding expected hydrostatic pressure by a significant factor (e.g., 5 to 25 times). After a predetermined delay, the pressure reading unit determines the actual hydrostatic pressure. A control unit, informed by this data, activates a fluid displacement pump if the hydrostatic pressure exceeds a set maximum. This system offers enhanced accuracy and efficiency in wastewater level management, particularly in scenarios where buildup or other factors may interfere with traditional monitoring methods.

Safety valves and methods of using safety valves. The safety valve is provided to a wellbore having a hydrostatic pressure. The safety valve is configured to operate at tubing well pressure. Pressure is applied to the safety valve with a single control line. The safety valve uses an accumulator in fluidic communication with the control line such that pressure acting on the accumulator is fluidically connected to pressure in the control line. The safety valve is insensitive to the hydrostatic pressure.

A fluid-activated shifting tool includes a fluid entry valve, a piston, a fluid pressure chamber and a relief pressure chamber. The piston can shift and provide a force relative to the toolstring using the pressure differential created between the pressure within the fluid pressure chamber compared to the pressure within the relief pressure chamber. The fluid entry valve provides a temporary fluid entry barrier between the well fluid and the fluid pressure chamber. At a selected depth within the wellbore, the fluid entry valve can be actuated, providing well fluid hydrostatic pressure inside the fluid pressure chamber. The shifting force of the piston can be used to acuate or set a plug within a tubing string of the wellbore.

The invention discloses an in-situ liquid level meter based on a pure mechanical pressure conversion mechanism and a measuring method thereof, the in-situ liquid level meter comprises a liquid level meter body composed of a meter shell, a glass mask, a dial and a pointer, and a pressure sensing diaphragm is arranged in an interface of the liquid level meter body; one end of the pressure sensing diaphragm is connected with a multi-stage lever and a gear transmission mechanism in the liquid level meter body, and the other end of the pressure sensing diaphragm extends out of the interface and is provided with a protective sleeve for protection; during actual use, the liquid level meter body is connected with a connection point of a measured container by adopting a pressure guide pipe or a flange, accurate conversion from pressure to liquid level and on-site display are realized through a pure mechanical structure based on a relation P = rhogh between hydrostatic pressure and liquid level height, the problems of interference, energy consumption, potential safety hazards and the like caused by electronic elements are avoided, and the liquid level meter is simple in structure and convenient to use. The adaptability, the stability and the reliability of liquid level measurement are improved. Meanwhile, by improving the connection mode with the tested container, the sealing performance, the adaptability and the stability of the connection are enhanced.

To provide a slit type dynamic and static water pressure gauge having a simple structure, capable of being manufactured at a low cost, and having high practicality capable of excellently measuring, for example, even a river, a water channel or the like in which sediment, refuse or the like flows.SOLUTION: This device is provided with a hollow cylindrical body 14 arranged in a fluid and provided with a slit 12 opposed to the direction of the flow of the fluid, and a measuring instrument housing part 16 internally communicating with the hollow cylindrical body 14 via a communication opening part 20 and forming a housing space 22 closed except the communication opening part 20. The hollow cylindrical body 14 is formed in a straight cylindrical shape, and the slit 12 is preferably provided long in parallel with the center axis.SELECTED DRAWING: Figure 1

This invention discloses a method for calculating the impact pressure of an open cavity entering the water under wave conditions, relating to the field of marine engineering technology. It is used to predict the entry process of an open cavity into the water. The method includes constructing a geometric model of the open cavity, constructing a wave field, simulating the motion of the target cavity entering and within the wave field, constructing the time-domain motion equation of the target cavity, solving the time-domain motion equation of the target cavity using numerical integration, calculating the hydrostatic pressure component, the impact pressure component, the air wave pressure component, and the wave-induced pressure component of the target cavity, and decoupling the calculation of the impact pressure based on these four sub-components. This invention improves the accuracy of calculating the impact pressure distribution and time history characteristics of an open cylindrical cavity under wave conditions by establishing a coupled dynamic model of the wave field and the entry process of the open cavity through a multi-phase coupling mechanism.

The application discloses a kind of measuring device and method of rock porosity under high hydrostatic pressure, it includes autoclave (5), rock sample (17) is fixed in autoclave (5), and the one end of autoclave (5) is connected with first valve (3) with plug (15);First valve (3) is connected with second valve (2);Second valve (2) connects manual liquid pressurizing pump (1);The other end plug (19) of autoclave (5) is connected with four-way valve (6);Four-way valve (6) one end connects vacuum pump (8), the other end connects second needle valve (9), and second needle valve (9) is connected with third three-way valve (11);Third three-way valve (11) is connected with third needle valve (12);Third needle valve (12) is connected with argon cylinder (14) by pressure reducing valve (13);Prior art does not have the device and method for measuring rock porosity under high hydrostatic pressure, using measurement under normal temperature and pressure environment cannot achieve the technical problems such as the like.

Safety valves and methods of using safety valves. The safety valve is provided to a wellbore having a hydrostatic pressure. The safety valve is configured to operate at tubing well pressure. Pressure is applied to the safety valve with a single control line. The safety valve uses an accumulator in fluidic communication with the control line such that pressure acting on the accumulator is fluidically connected to pressure in the control line. The safety valve is insensitive to the hydrostatic pressure.

The invention specifically discloses an SPH-based debris flow water tank experiment simulation method, and relates to the technical field of geological disaster simulation and fluid dynamics. The method comprises the following steps: S1, inputting water tank size parameters according to experimental requirements and generating a water tank model terrain; s2, debris flow rheological parameters are input, and solid-liquid two-phase SPH particles are generated; s3, applying wall surface repulsive force according to the geometrical morphology of the water tank and the accumulation area so as to set normal boundary conditions, defining an initial velocity field and hydrostatic pressure distribution, adopting an improved solid-phase fractional coupling friction-turbulence model and an SPH method for coupling solution, and calculating debris flow flowing and interaction; and S4, outputting a simulation result. According to the method, the problems of high cost, complex operation, long period and potential safety hazards of a traditional physical experiment are solved, the rheological characteristics and the movement law of the debris flow are accurately described, a high-precision numerical simulation means is provided for the experiment, and disaster mechanism research and disaster prevention and reduction measure formulation are assisted.

Flexible containment tubes form sections of a dike for fluid containment. For example, multiple vinyl-coated polyester tubes with a 19-inch diameter may be filled with water and stacked on top of each other to create a temporary diversion dike. Multiple sections of dike may be abutted together to form longer sections of dike. A vapor barrier or plastic membrane may wrap over dike sections and / or weaved through the flexible containment tubes as they are placed prior to filling. Configurations of the vapor barrier and associated anchoring mechanisms improve the utility of dike sections by reducing hydrostatic pressure of contained fluid on the dike, harnessing the weight of fluid columns, and mitigating seepage through the dike sections.

The invention relates to the technical field of in-well pressure measurement, in particular to a formation pressure measuring method and a formation pressure measuring pipe column, the formation pressure measuring pipe column comprises an oil pipe, a pressure measuring element, a packer and a liquid extractor, the packer seals the annulus of the pressure measuring pipe column and a shaft above the formation, the liquid extractor comprises a cylinder body and a piston, the cylinder body is connected with the oil pipe, and the piston is connected with the oil pipe. The piston divides an inner cavity of the pressure measuring pipe column into an upper pipe cavity and a lower pipe cavity, the piston and the cylinder body move relatively to be used for sucking well killing fluid in the lower pipe cavity of the pressure measuring pipe column so that formation fluid can flow into a shaft from a formation, and the pressure of the lower pipe cavity of the pressure measuring pipe column and the pressure of the shaft below the packer are equal to the pressure of the formation. The liquid column pressure of the well killing fluid in the upper pipe cavity and the space above the packer is separated from the pressure of the lower pipe cavity and the space below the packer, the formation pressure can be obtained by measuring the pressure of the lower pipe cavity of the pressure measuring pipe column or the pressure of a shaft below the packer, the influence of the well killing fluid in the shaft is avoided, and the formation pressure measuring accuracy is improved.