8 results about "Pressure analysis" patented technology

The application provides a dynamic measurement method and system based on parallel differential pressure analysis, and relates to the technical field of gas-liquid mass transfer measurement. The method adopts a measurement unit and a control unit in parallel, a first closed container of the measurement unit containing liquid and gas, and the initial volume of the gas phase in a second closed container of the control unit being the same as the volume of the gas in the first closed container. After the pressure of the two containers is synchronously and suddenly increased to the initial pressure P0 by synchronous pressure excitation, the system is closed, and the pressure decay curves P1(t) and P2(t) in the two containers are synchronously collected. After differential processing, the influence of system leakage is eliminated, and the net pressure decay curve ΔP(t) is obtained. Based on the ideal gas state equation, the change amount of the dissolved gas mass with time is inversed, and the dissolution kinetics data are obtained. The application can dynamically and accurately measure the gas dissolution process, effectively eliminates the leakage interference, and provides key dissolution kinetics data for gas-liquid mass transfer engineering.

The application provides a water injection well pressure analysis method considering the influence of fracture induced by pressure drive water injection, which comprises the following steps: step 1, establishing a water injection well pressure analysis model considering the influence of fracture induced by pressure drive water injection; step 2, solving the water injection well pressure analysis model considering the influence of fracture induced by pressure drive water injection; step 3, obtaining a water injection well double logarithmic pressure analysis curve through analysis, and judging different flow stages of the reservoir in the fracturing process according to the curve; and step 4, analyzing the bottom hole pressure response characteristics of the pressure drive water injection well, and applying the characteristics to an actual well to verify the accuracy of the established model. The water injection well pressure analysis method considering the influence of fracture induced by pressure drive water injection establishes a water injection well pressure analysis model considering the dynamic expansion of the fracture, has certain technical difficulty, and can determine the flow stage of fluid in the reservoir at different production moments.

The invention relates to the technical field of data processing, and provides a carbon dioxide energy storage soaking time dynamic optimization method based on pressure analysis, and the method comprises the steps: collecting pressure data of an inlet end in a CO2 injection process of an experiment well, and constructing a pressure data sequence of each collection period; dividing a first stage, adjusting the carbon dioxide injection rate at the collection moment after the first stage, updating the first stage, and identifying a soaking starting moment according to the updated first stage; the wellhead casing pressure of a test well is collected, a wellhead casing pressure sequence of a collection period is established, a collection period to be confirmed and a wellhead casing pressure subsequence to be confirmed are determined, and the shut-in ending moment is determined by combining the change trend of all the wellhead casing pressure subsequences before the wellhead casing pressure subsequence to be confirmed. The invention aims to improve the accuracy of the optimal soaking time.

Systems and processes for assessing connectivity between subterranean injector and producer wells. One process includes assessing pressure analytics before, during or after injection of stimulation fluid into a well. Pressure communication analytics includes analysis of pressure inflection at selected downhole locations and measuring one or more of: time to a first pressure inflection of a test fluid at the selected downhole locations; volume of test fluid pumped during time to first pressure inflection at the selected downhole locations; differential of pressure at the selected downhole locations from moment of the first pressure inflection to end of injection of test fluid in a well; pressure derivative at the selected downhole locations during entire time of injection of test fluid into the well; and pressure response at selected downhole locations at and post shut-in of injection of the test fluid, and composing a connectivity matrix which classifies observed pressure.

This invention discloses a localized grouting and water-blocking test system and method for highly water-rich sandy gravel formations, relating to the technical field of grouting simulation systems. The test system includes: a sandy gravel formation simulation module comprising multiple vertically placed model boxes of different diameters, each filled with sandy gravel media; a localized grouting module comprising a grout storage tank, a grout delivery pipe, ball bearings, and a retractable grouting sleeve connected in sequence; a constant-temperature water supply module to create a highly water-rich environment for the sandy gravel media; a data acquisition module including pressure sensors and flow sensors; and a data analysis module electrically connected to the data acquisition module, including pressure analysis and flow analysis modules. The sandy gravel formation simulation system enables effective simulation of formations at different scales. Furthermore, during numerical simulation, considering the dilution of grout concentration due to the water-rich environment, a grout density field is introduced to comprehensively analyze the grout penetration and fracturing processes during grouting.

The invention discloses a borehole wall collapse pressure analysis method and device based on mudstone hydration. Comprising the steps that a mudstone well wall is regarded as a semi-permeable membrane, chemical potential difference is introduced, and a drilling fluid invasion physical model and a multi-field coupling equation under the drilling fluid invasion mudstone multi-field coupling condition are established under the solute diffusion condition; based on the assumed condition of drilling fluid invading mudstone, a well circumference stress calculation model under the multi-field coupling condition and a hydration mechanical stress balance equation, obtaining an all-directional stress expression under the hydration effect and boundary conditions of well wall instability calculation of the drilling fluid invading physical model, and obtaining stratum well circumference stress under the hydration effect; the change rule of rock mechanical parameters along with the formation water content is analyzed, a borehole wall collapse pressure model after mudstone hydration is established based on linear elastic hypothesis of the mudstone borehole wall and superposition of formation well circumferential stress, and the well circumferential borehole wall collapse pressure after mudstone hydration is solved in combination with actual drilling data. The method can be used for reasonably predicting the borehole wall collapse pressure of a mudstone-containing interlayer or sand mudstone.

The application provides a geological temperature and pressure analysis method based on multi-agent collaborative decision-making, and relates to the technical field of geological analysis. The method comprises the following steps: by establishing sample identification and performing quality diagnosis on the temperature and pressure analysis data, first distinguishing the balanced and unbalanced sample states, then combining the tectonic background to perform constrained screening and executability analysis on the temperature and pressure meter, performing parallel joint solving of multiple temperature and pressure meters under unified algorithm configuration, introducing a correction mechanism for the unbalanced sample, finally performing weighted fusion on the consistency, compatibility and confidence of multiple results, and outputting the temperature and pressure conclusion with interval significance and reliability annotation. The application can improve the accuracy of geological temperature and pressure analysis in complex geological environment.

The invention discloses a blocking pressure analysis method for a deep tunnel drainage system, and relates to the technical field of tunnel monitoring. The method comprises the steps that after it is determined that a drainage system is blocked according to operation information of a tunnel, an instrument is used for detecting the tunnel to determine the length of a blocked area; the water level of the tunnel is monitored through a weir method, and the water inflow of the tunnel is determined; structural parameters of the tunnel are obtained, the water inflow and the length of the blocked area are combined, a preset water inflow model is input, and blocking parameters of the blocked area are obtained; and determining a water head of the blocked area according to the blocking parameters, and performing early warning according to the water head of the blocked area. After the water inflow is monitored and it is judged that the tunnel is blocked, the water head of the blocked area can be analyzed by measuring the blocked area and combining the water inflow. And a basis is provided for tunnel blockage condition analysis, and diseases such as supporting structure cracking are avoided.