11 results about "Enhanced recovery" patented technology

The application provides a method for improving the recovery of natural gas hydrates in permafrost regions. The method comprises the following steps: (1) discharging free gas from the target permafrost region natural gas hydrate reservoir by depressurization, so that the reservoir temperature of the target permafrost region natural gas hydrate reservoir is less than 0 DEG C and greater than or equal to -6 DEG C, and the reservoir pressure reaches 0.8-1.2 times the phase equilibrium pressure of the natural gas hydrate; (2) injecting a mixed gas of CO2 and H2 into the target permafrost region natural gas hydrate reservoir for multiple rounds of throughput sweeping; wherein, between each round of throughput sweeping, huff and puff is carried out, and the temperature of the target permafrost region natural gas hydrate reservoir is maintained at less than 0 DEG C and greater than or equal to -6 DEG C; (3) after the throughput sweeping is completed, injecting CO2 into the target permafrost region natural gas hydrate reservoir for sweeping to recover free H2 and for geological storage of CO2. The method can significantly improve the recovery of natural gas in permafrost regions, effectively ensure the stability of the reservoir, and achieve geological storage of carbon dioxide.

This invention provides a method for preparing a high-salinity zinc oxide-resistant nanofluid mediated by Halomonas sp. and its application in enhancing oil recovery. Specifically, it includes: a Halomonas sp. strain CDH-2, with accession number CCTCC NO: M 2025786, which can rapidly grow in high-concentration salt solutions and produce salt-resistant extracellular metabolites. Fermenting and culturing CDH-2 under high-salt conditions yields a fermentation broth with a surface tension below 30 mN / m. Mixing and culturing the obtained fermentation broth with a metal precursor solution yields a high-salinity-resistant metal nanofluid. The resulting metal nanofluid maintains good stable dispersibility in high-salinity water and effectively reduces oil-water interfacial tension. It alters the wettability of oil-wetting surfaces, emulsifies and disperses crude oil, and reduces crude oil viscosity. Therefore, it can be used as an enhanced oil recovery agent in high-salt reservoirs and is widely applied in oilfield flooding, well huff and puff, and heavy oil viscosity reduction.

The invention discloses a method for intensively recovering sulphide ore by regulating and controlling the surface tension of ore pulp, which comprises the following steps: with sulphide ore as a research object, grinding raw sulphide ore and preparing into ore pulp with fixed concentration, and regulating and controlling the surface tension of the ore pulp of the sulphide ore to be within a range suitable for floating by adding a flotation collecting agent, a pH regulator and a foaming agent. And efficient flotation recovery of sulfide ore is achieved. The method is technically characterized in that under the action of the combined reagent, gangue minerals are effectively inhibited by regulating the surface tension of ore pulp to be within the range suitable for floating, meanwhile, sulfide ores are activated, and through the direct flotation technological process, strengthened recovery of the sulfide ores is successfully achieved. The technology has the advantages of high recovery rate, good selectivity, strong adaptability and the like, and is suitable for industrial production. In a gold-bearing sulfide ore flotation experiment, the ore pulp surface tension is regulated and controlled to be 48-50 mN / m, the concentrate grade and the recovery rate are successfully improved, the gold concentrate grade is improved to 39.42 g / t from 34.02 g / t before application, and the recovery rate is improved by 10.37%.

The present application relates to the technical field of carbon dioxide capture, utilization and geological storage, and particularly to a method, system, device and storage medium for CO2 enhanced gas reservoir recovery and storage, the method comprising: S100, acquiring dynamic parameters of a developed target gas reservoir in a current state, and analyzing key factors; S200, constructing a potential prediction model for CO2 enhanced recovery of the target gas reservoir, and generating a CO2 displacement recovery enhancement range of the target gas reservoir; S300, analyzing whether the CO2 displacement recovery enhancement range of the target gas reservoir is greater than an economic production range; S400, constructing a basic numerical simulation model of an actual development well group of the target gas reservoir, and generating an economic net present value and a CO2 geological storage amount; S500, generating a conversion timing and corresponding simulation engineering parameters by using a Bayesian adaptive direct search algorithm, and calculating a target function; and S600, generating optimal engineering parameters. By using the present application, the CO2 recovery rate can be improved, the effective storage amount can be maximized, the optimization cost can be reduced, and the optimization efficiency can be improved.

The application discloses a carbonate rock oil reservoir recovery improvement method and system, and performs thermal gravity analysis on crude oil extracted from a light oil reservoir, divides the whole process of crude oil oxidation according to a DSC curve peak value and an inflection point; different oxygen concentration reduction oxygen air is configured for the divided whole process of crude oil oxidation; oxygen concentration, gas injection amount and oxidation time of the different oxygen concentration reduction oxygen air are changed based on reservoir temperature and pressure, the different oxygen concentration reduction oxygen air is injected into a stratum, and influence on crude oil oxidation characteristics is analyzed; the best reduction oxygen air injection parameter suitable for the light oil reservoir is determined according to the influence of the different oxygen concentration reduction oxygen air on the crude oil oxidation characteristics, and the recovery of the carbonate rock oil reservoir is improved. The crude oil production is greatly improved, and the application prospect is wide.

The application discloses a tackifier, a preparation method of the tackifier, a composite plug oil displacement agent and an enhanced oil recovery method. The tackifier contains structural unit A, structural unit B, structural unit C and structural unit D, and the mass ratio of the structural unit A, the structural unit B, the structural unit C and the structural unit D is (2000-20000):(2000-40000):(4000-60000):(6000-100000), n is 1-15, m is 1-20, and the viscosity average molecular weight of the tackifier is 45-50 million. The tackifier has the following advantages: under the condition of a temperature of 60-70 DEG C and a salinity of 10000 mg / L, the viscosity of a polymer solution is greater than 100 mPa s; when the concentration of the polymer solution is 1000 mg / L, the surface tension is less than 40 mN / m, the tackifier has the function of emulsifying and dispersing crude oil, and the oil displacement efficiency of a physical model is increased by more than 12%.

The invention relates to the field of viscosity reduction and recovery efficiency improvement of thick oil, and discloses a compound with functions of reducing viscosity and improving the recovery efficiency of thick oil as well as a preparation method and application of the compound. The compound has a chemical structure as shown in a formula 1 and has relatively high temperature resistance, salt resistance and calcium and magnesium resistance, and a solution of the compound can form a stable oil-in-water emulsion with thickened oil, so that the flow resistance is reduced, and the viscosity of crude oil is greatly reduced.

The invention belongs to the technical field of oil and gas field recovery efficiency improvement, and discloses a CO2 gas driving soluble foaming agent and a preparation method thereof.The preparation method comprises the steps that diisocyanate is added into a solvent to be completely dissolved, disaccharide is added, and an intermediate A is obtained after the reaction is finished; under a nitrogen atmosphere, adding fluoroalcohol into the intermediate A, uniformly stirring, dropwise adding a catalyst, and reacting to obtain an intermediate B; and adding a sulfonating reagent into the intermediate B, and stirring for reaction to obtain the CO2 gas-driving soluble foaming agent. The CO2 gas displacement soluble foaming agent prepared by the method has remarkable advantages in the aspects of solubility, oil resistance, temperature resistance, salt resistance, environmental friendliness and the like, and the foaming agent has wide application prospects and important economic values in the fields of oil exploitation, gas displacement and the like due to the advantages.

The application discloses a kind of gas-water alternating injection device and method based on carbon dioxide extraction, to solve the technical problem of long response time of existing gas channeling control technology depends on manual analysis, the gas-water alternating injection device includes production well monitoring device, injection well monitoring device and control device, by integrated monitoring and control technology, overall monitoring and accurate control to oil and gas exploitation process are realized.The gas-water alternating injection method is based on the optimization of gas-water alternating injection strategy by gas-water alternating injection device, the maximum injection capacity is obtained by dynamic seepage capacity, and the control effect of gas channeling is ensured by accurate water slug injection.The above-mentioned device and method reduce the system fluctuation caused by manual operation, improve the response speed and the accuracy of operation, and the reliability and stability of the system.

The invention relates to the technical field of unconventional shale oil and gas reservoir exploration, in particular to a method, a device, equipment and a medium for predicting the imbibition utilization efficiency of stratified shale oil. According to the method, the imbibition utilization efficiency of the stratified shale oil can be quickly predicted, and an effective means is provided for revealing an interaction reaction mechanism of shale reservoir rock and an injected medium, a shale reservoir rock imbibition oil extraction mechanism, a shale reservoir recovery efficiency improving mechanism and the like. According to the present invention, the imbibition oil discharge indoor test under the oil reservoir temperature and pressure condition is combined with the two-dimensional nuclear magnetic analysis, and the use conditions of the crude oil in different aperture spaces are distinguished according to the two-dimensional nuclear magnetic T1 and T2 spectrograms of the nuclear magnetic diagnosis, such that the respective imbibition oil discharge efficiency functions and the overall critical use lower limit of different aperture intervals are established so as to be adopted as the data volume model; the method for rapidly predicting the imbibition utilization efficiency of the stratified shale oil by using the two-dimensional nuclear magnetic technology under the conditions of rapidness, accuracy and no damage to the rock core is provided.

The application discloses a kind of waste condensate gas reservoir condensate oil gas enhanced recovery method, comprising the following steps: collecting microbial sample from waste condensate gas reservoir related sample, and culture;Nutrients are pretreated to ensure that it is suitable for injection formation;Microorganism and nutrient substance are mixed and injected into waste condensate gas reservoir through injection well;During stewing well, relevant parameters of formation are closed and monitored, relevant conditions of microorganism are evaluated and corresponding measures are taken according to the evaluation result;After stewing well, the yield and quality parameters of mining are monitored, and the mining parameters are optimized according to the relevant data in the mining process;After mining, the formation environment is evaluated and repair measures are taken when there is adverse effect.The microbial enhanced oil recovery of the application mainly uses microorganism and its metabolites to improve recovery efficiency, and the microorganism can naturally breed and grow in the formation, and the cost of required nutrients is relatively low, compared with expensive chemicals in chemical flooding method, which greatly reduces the mining cost.