15 results about "Hydrostatic pressure" patented technology

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.

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 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.

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.

This invention attempts to address the problem of hydraulic discontinuity by combining two methods. The reduction of fluid density is promoted by diluting the inhibitor product with a water-based fluid and increasing the fluid flow rate. The first method reduces the hydrostatic pressure gradient in the injection line, while the second method increases the pressure drop due to friction in the line. This combined effect prevents hydraulic discontinuity in the injection. To this end, the invention incorporates an industrial water tank, pump, and line fitting (flow rate T) on ground equipment. This assembly is used to dilute the inhibitor in the injection line while ensuring a minimum inhibitory concentration.

This invention provides a valve wear and corrosion testing device, method, and application simulating a deep-sea environment. The device includes: a pipeline circulation module for connecting the valve to be tested, providing a flow path for the corrosive medium, regulating hydrostatic pressure, and measuring flow rate data; an environmental control module for regulating the temperature, salinity, pH value, and gas component content of the corrosive medium to simulate the service environment of a deep-sea target; a friction control module for driving the valve stem and valve core to reciprocate, applying mechanical loads, and collecting vibration signals; and a data processing module for calculating leakage, determining wear status based on flow fluctuation ratio, identifying failure by comparing vibration curves, and assessing remaining life based on a multi-factor damage prediction model. This invention achieves valve wear and corrosion performance testing and life prediction under a multi-factor coupled environment in the deep sea, improving the accuracy of the assessment.

A portable, case-enclosed pressure test manifold, configured to support both pneumatic and hydrostatic pressure testing, and comprising a downstream fluid path (e.g., a system test gauge, a ball valve, a system test port, a system relief valve, and other components / piping) and an upstream fluid path (e.g., a low-pressure gauge, a high-pressure gauge, and various other components / piping). A regulator and / or the ball valve selectively operate the downstream fluid path, defining a hydrostatic pressure testing path, to receive a liquid; and the upstream fluid path in combination with the downstream fluid path, defining a pneumatic pressure testing path, to receive a gas. Manifold components are pressure rated based on use and are ASME Code B31.3 compliant. Properly rated flexible hoses connect with either of the pneumatic or the hydrostatic pressure testing paths of the manifold. The case includes parking receptables and a carrying handle configured to stow the hose during transport.

The application relates to the technical field of unconventional oil and gas exploration, in particular to a high-clay shale oil in-situ accumulation dynamics mechanism and mode evaluation method, which comprises the following steps: collecting fluid pressure, temperature data, displacement pressure, oiliness, brittleness index, hydrostatic pressure, vitrinite reflectance and density values of shale samples at each depth position point of a probe well of each survey point; calculating abnormal sensitivity; then obtaining ground temperature evaluation credibility; obtaining self-adaptive fitting weight; obtaining actual fluid pressure of the probe well of each survey point at each depth; obtaining pressure coefficients of shale samples at each depth position point of the probe well of each survey point; obtaining self-sealing accumulation mode and retention accumulation mode of shale oil; and constructing a shale oil enrichment area evaluation comprehensive index based on vitrinite reflectance, oiliness, brittleness index and pressure coefficient to evaluate high-clay shale in-situ flow. The application improves the accuracy of evaluation of high-clay shale in-situ self-sealing accumulation, retention accumulation and dynamics mechanism.

This invention relates to the field of downhole operations and packers for oil and gas wells, and discloses a permanent hydrostatic packer, comprising a central tubing assembly and a drive assembly, an anchoring assembly, and a locking assembly connected to the central tubing assembly. The drive assembly is used to drive the anchoring assembly through downhole fluid pressure differential, causing the anchoring assembly to abut against the internal passage of the tubing to form a seal against the internal passage. The locking assembly is used to restrict the movement direction of the anchoring assembly. The purpose of this invention is to solve the problem that after the packer is driven by hydrostatic pressure, the movement direction of the anchoring component cannot be effectively restricted, resulting in unstable abutment and sealing effect against the internal passage.

The invention relates to the technical field of geothermal development, in particular to a geothermal well two-phase flow wellbore pressure profile prediction method and device, application, electronic equipment, a storage medium and a computer program product. The method comprises the following steps: constructing a pressure drop equation based on factors influencing the pressure drop of gas-liquid two-phase fluid in a shaft; wherein the factors influencing the fluid pressure drop in the shaft comprise fluid weight pressure drop in the shaft, friction pressure drop in the shaft, hydrostatic pressure change and acceleration pressure drop; optimizing the pressure drop equation to obtain a two-phase flow pressure profile prediction model in the shaft; and predicting the wellbore pressure profile of the two-phase flow geothermal well based on the in-wellbore two-phase flow pressure profile prediction model. According to the method, the pressure drop caused by multiple factors is considered, so that the calculation result is more accurate.

This invention relates to the field of deep-sea sample testing, specifically to a dissolved gas extraction device for in-situ deep-sea testing. The device includes a sampling unit containing a sampling chamber and a back pressure chamber, a vacuum unit, a detection unit, and a built-in expander suspended within the sampling chamber. The built-in expander exhibits pressure response characteristics: when the sampling chamber is filled with high-pressure seawater, it is compressed to increase the flow area of ​​the annular channel; when the pressure decreases and the chamber is emptied, it expands to occupy the internal space of the sampling chamber. This invention utilizes the pressure difference between the deep-sea hydrostatic pressure and the vacuum chamber as a power source to directly drive the rapid flow of seawater and induce intense flash evaporation and desorption, quickly forming a headspace for detection. The dissolved gas extraction device achieves pump-free operation and optimizes fluid transport efficiency through the expander, significantly improving the extraction speed of dissolved gases.

An apparatus including: a container housing a body immersed in a fluid; at least one actuator configured to cause the body to move within the fluid to deflect about an equilibrium position of the body within the fluid, wherein when the body is not at its equilibrium position, hydrostatic pressure from the fluid acts to cause the body to return to its equilibrium position; and at least one connector connecting the container to an output shaft; wherein when the hydrostatic pressure is acting to cause the body to return to its equilibrium position, the container and the at least one connector are caused to at least partially rotate about an axis, wherein the at least partial rotation causes the output shaft to rotate.

The present application relates to a kind of deep-sea power push rod testing device and testing method, it is related to deep-sea equipment technical field, wherein, device includes: power push rod, passage control module, pressure balance cylinder, storage cylinder and hydrostatic pressure tank;Passage control module is provided with three conducting ports, and three conducting ports are respectively connected with power push rod, pressure balance cylinder and storage cylinder;Three conducting ports of passage control module are controlled using solenoid valve;Hydrostatic pressure tank is used to provide preset working water pressure;When solenoid valve is powered on, pressure balance cylinder is communicated with power push rod, liquid in pressure balance cylinder is pressed into power push rod based on the working water pressure of hydrostatic pressure tank, and the telescopic rod of power push rod is pushed out under the action of internal and external pressure difference;When solenoid valve is powered off, storage cylinder is communicated with power push rod, and the telescopic rod of power push rod is retracted under the action of external working water pressure and press the liquid in power push rod into storage cylinder.