148 results about "Oil displacement" patented technology

This invention belongs to the technical field of large-channel or dominant channel treatment and plugging in water-driven oil reservoirs, specifically involving an in-situ modification and plugging method within fly ash reservoirs. The method includes: mixing a modified working fluid and fly ash; pumping the resulting mixture into a sand-filled pipe at a constant rate; and then allowing it to stand at reservoir temperature, resulting in modified fly ash and simultaneous plugging. This invention transfers the fly ash modification treatment from the surface to the reservoir pores, achieving the same modification effect as surface modification while simplifying the process, avoiding investment in surface treatment equipment, and saving on waste liquid treatment costs. Furthermore, the waste liquid contains alkali and polymer solutions, forming an "alkali / polymer" binary system, which helps improve oil displacement efficiency. Therefore, the in-situ modification treatment and combined plugging effect within fly ash reservoirs can effectively expand the swept volume and improve oil displacement efficiency, significantly increasing oil recovery.

This invention belongs to the technical field of oil and gas field development and enhanced oil recovery, specifically relating to a bio-based ternary composite enhanced oil recovery system and its preparation method. The bio-based ternary composite enhanced oil recovery system of this invention, by weight, comprises: 800-2000 parts of biopolymer; 600-3000 parts of biosurfactant; 40-400 parts of bionanomaterials; and 200-800 parts of water. In the bio-based ternary composite enhanced oil recovery system provided by this invention, the composite enhanced oil recovery system of biopolymer, biosurfactant, and bionanomaterials fully leverages the synergistic effect of each component, demonstrating significant advantages in improving crude oil recovery and reducing environmental risks, and possessing good industrial application prospects and promotional value.

This invention discloses an amphiphilic uniform penetration inhibitor oil displacement agent, its preparation method, its application, and a method for improving oil recovery. The preparation method of the amphiphilic uniform penetration inhibitor oil displacement agent comprises the following steps: In the presence of an initiator and a solvent, sodium styrene sulfonate, acrylamide, N-ethoxymethyl-N-isobutoxymethylacrylamide, and 3-acetamino-N-ethyl-N,N-dimethylpropyl-1-amine undergo a solution polymerization reaction. The molar ratio of sodium styrene sulfonate, acrylamide, N-ethoxymethyl-N-isobutoxymethylacrylamide, and 3-acetamino-N-ethyl-N,N-dimethylpropyl-1-amine is 1:0.01–25:0.01–50:0.01–50. The solution polymerization reaction results in an amphiphilic uniform penetration inhibitor oil displacement agent with a viscosity-average molecular weight of 35 million to 40 million.

This application discloses a composite oil displacement system and its preparation method, belonging to the field of oilfield development technology. The composite oil displacement system provided in this application includes rhamnolipin and betaine surfactant, wherein the rhamnolipin is a biosurfactant obtained by culturing *Pseudomonas aeruginosa*. Both the rhamnolipin biosurfactant and the betaine surfactant are heat- and salt-resistant; therefore, the composite oil displacement system prepared using the rhamnolipin biosurfactant and the betaine surfactant has good compatibility with high-temperature, high-salinity reservoirs, meaning it is suitable for such reservoirs. Therefore, it can significantly improve the oil displacement effect in high-temperature, high-salinity reservoirs.

The application provides a CO2 oil displacement storage regulation optimization decision method and system, the method obtains a three-dimensional geological model, production dynamic data and monitoring data of a target working area; a component numerical simulation technology is used to fit a CO2 injection production dynamic history of the target working area, so that target operation parameters of a simulation operation model are adjusted and determined to obtain a matched production simulation operation model; a gas-oil ratio is determined according to the production dynamic data, and then a gas channeling index is calculated, and a target well group meeting the conditions of the gas channeling index is selected; a relationship curve distribution between a Peclet number, an oil increment and a component sweep efficiency is determined by simulating different injection speeds to determine an optimized target injection speed; and development parameters corresponding to different injection modes are simulated, and the target injection mode is determined in combination with the gas channeling index, the sweep efficiency and the miscibility degree. The scheme can overcome the defects of the prior art that the parameter optimization is not in place and the precision is insufficient, and can consider the particularity of the CO2 oil displacement mechanism to establish a regulation optimization strategy based on dimensionless parameters.

The application discloses a carboxyl modified nano oil displacement agent which is composed of a nano silicon dioxide skeleton and a functional group connected to the nano silicon dioxide skeleton, wherein the functional group is -RCOOM, R is CH2 or C2H4, and M is one of Li, K and Na. The application also discloses a preparation method of the carboxyl modified nano oil displacement agent, which comprises the following steps: (1) preparing a hydroxyl silicon dioxide nanoparticle dispersion liquid; (2) preparing an amino modified nano silicon dioxide solution, and obtaining amino modified nano silicon dioxide particles after first post-treatment; and (3) dispersing the amino modified nano silicon dioxide particles in water, adding a halogen acetic acid monovalent salt, and then performing reaction and second post-treatment to obtain the carboxyl modified nano oil displacement agent. The oil displacement system is composed of the carboxyl modified nano oil displacement agent, a polymer, a surfactant and water, wherein the carboxyl modified nano oil displacement agent accounts for 0.05-0.3%, the polymer accounts for 0.1-0.3%, the surfactant accounts for 0.1-1%, and the rest is water.

This invention relates to a particle-polymer aggregate composite oil displacement agent and its application. The oil displacement agent of this invention comprises: (A) a particle suspension containing particles and water, wherein the mass fraction of the particles is 200-2000 ppm; and (B) a polymer solution containing a polymer and water, wherein the mass fraction of the polymer is 0.01-10 ppm, and the polymer is one of the following: (B1), (B2), or (B3): (B1) an ionic polymer, wherein the ionic polymer is a cationic or anionic polymer, wherein the charge of the ionic groups on the polymer molecular chain is opposite to the charge of the particle surface; (B2) a mixture of cationic and anionic polymers; (B3) a naturally aged nonionic polymer. The oil displacement agent of this invention is low in cost, easy to inject, has a high sealing effect, and good oil displacement effect.

The invention discloses an injection and production system and method for improving the CO2 huff and puff effect of a shale and compact oil and gas reservoir based on high-pressure pressure-maintaining soaking, and belongs to the technical field of shale and compact oil and gas reservoir development. The constant temperature device comprises a CO2 intermediate container, an experimental oil intermediate container and a high-temperature and high-pressure reaction kettle which are arranged in a constant temperature box; the CO2 gas cylinder is respectively communicated with the CO2 intermediate container, the experimental oil intermediate container and the high-temperature and high-pressure reaction kettle; and both the CO2 intermediate container and the experimental oil intermediate container are communicated with the constant pressure pump. According to the method, the reservoir energy can be effectively maintained by adopting a high-pressure pressure-maintaining soaking technology, the problem of poor recovery efficiency caused by pressure drop in the CO2 huff and puff process can be effectively solved, the oil displacement effect of CO2 in the shale reservoir is remarkably improved, and the recovery degree of each turn can be remarkably improved.

This invention discloses a multi-component compound system of nano-oil displacement agent, its preparation method, and its application. The multi-component compound system of nano-oil displacement agent comprises anionic surfactant and co-surfactant; the anionic surfactant is at least one compound having the general formula shown in formula (I): R1-Indole-O-(PO). n (EO) m CH2COOMa formula (I), where R1 is C1~C 20 The hydrocarbon group; n is any integer from 0 to 20; m is any integer from 0 to 30; and m and n are not both 0; M is an alkali metal or an alkaline earth metal, where a is 1 when M is an alkali metal and 0.5 when M is an alkaline earth metal; the co-surfactant is selected from at least one of zwitterionic surfactants and cationic surfactants. This multi-component compound system of nano-oil displacement agent can form nano-microemulsions with extremely low interfacial tension, strong solubilization ability, and micelle size reaching the nanoscale. It has strong anti-adsorption ability in formations and is suitable for low-permeability reservoirs with harsh conditions.

This invention discloses a ternary composite oil displacement system based on the synergistic effect of nanofluids and polymers, belonging to the field of petroleum extraction technology. It includes a pretreatment unit, a nanofluid supply unit, a temperature- and salt-resistant polymer supply unit, a composite mixing unit, an online synergistic injection unit, and a formation synergistic displacement unit. The outlet of the pretreatment unit is connected to the composite mixing unit, and the nanofluid supply unit and the temperature- and salt-resistant polymer supply unit are connected in parallel to the composite mixing unit. Through the synergistic effect of nanofluids and temperature- and salt-resistant polymers, multiple synergistic effects of "dispersion stabilization, viscosity enhancement, seepage control, and residual oil stripping" are achieved. The modified nanoparticles and temperature- and salt-resistant polymer molecules form hydrogen bonds and electrostatic adsorption complexes, which not only significantly improve the solubility and viscosity stability of the polymer in high-temperature, high-salinity formation water environments but also prevent polymer molecular chain degradation.

This invention belongs to the field of petrochemical new materials technology, specifically relating to a novel oil displacement agent and its preparation method. The novel oil displacement agent comprises the following raw materials in parts by weight: 3-7 parts of either acrylic acid or methacrylic acid, 20-30 parts of acrylamide, 1.1-2.3 parts of octadecyl acrylate, 10-21 parts of polymeric oil, 1-3 parts of emulsifier, 0.05-0.08 parts of initiator, and 1.7-2.4 parts of phase inverting agent. The oil displacement agent provided by this invention is suitable for 5-50 mD low-to-medium permeability reservoirs, does not cause pore throat blockage, can be mixed online without human intervention, effectively improves the oil-water mobility ratio, enhances oil washing efficiency, and significantly improves crude oil recovery. It is suitable for fracture network fracturing of continental sedimentary unconventional oil and gas reservoirs and the development of low-to-medium permeability reservoirs, solving the problems of difficult injection, easy blockage, and high cost of traditional polymer flooding.

The invention relates to the technical field of oilfield development, and discloses a composition with an oil displacement function, application of the composition and a thickened oil recovery method. The composition comprises a nano material, a surfactant and a polymer, wherein the surfactant is selected from at least one of fatty alcohol polyether sulfonate, fatty alcohol polyether sulfate, a gemini surfactant containing a sulfonic acid group, a glycoside compound, an alcohol amine compound and an amide compound containing a hydroxyl group; wherein the mass ratio of the nano material to the surfactant is (0.1-2): 1. The aqueous solution of the composition has the characteristics of high viscosity and low interfacial tension in indoor experiments and field application, and can reduce the average water content of high-calcium-magnesium oil reservoirs and improve the crude oil recovery rate, thereby greatly improving the oil quantity and benefits of low-yield and low-efficiency wells.

This disclosure relates to a chemical flooding development method for highly heterogeneous, low-to-medium permeability reservoirs. The method involves preferentially injecting a first substance into the thin, poor-permeability layer of the reservoir, followed by the simultaneous injection of a second, third, and fourth substance into both the thin, poor-permeability layer and the good-permeability layer. The second substance blocks the dominant flow channels in the target layer; the third substance adjusts the liquid absorption profile of the target layer, expands the swept volume, and improves the oil displacement efficiency; and the fourth substance prevents the third substance from advancing along the dominant flow channels. Ultimately, the remaining oil in the thin, poor-permeability layer is effectively displaced, and the dominant flow channels in the good-permeability layer are blocked, forming a balanced, continuous, and effective displacement method suitable for highly heterogeneous, low-to-medium permeability reservoirs. Therefore, the chemical flooding development method provided by this invention can effectively improve the recovery rate of low-to-medium permeability reservoirs.

This invention belongs to the field of petroleum extraction technology, specifically relating to a high-temperature resistant oil displacement agent and its preparation method. The method includes: in a nitrogen-filled reactor, under the action of a catalyst, trimethylolpropane allyl ether and 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecylfluoro-8-iodooctane undergo an addition reaction; next, a sulfonation reaction occurs with chlorosulfonic acid; and finally, a substitution reaction occurs with dodecylamine to obtain the product oil displacement agent. The molar ratio of 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecylfluoro-8-iodooctane, chlorosulfonic acid, dodecylamine, and trimethylolpropane allyl ether is 0.8-1.2:1.8-2.4:0.8-1.2:1. The molecular formulas of the main components of the oil displacement agent are as follows: [Insert molecular formula here]. This invention's high-temperature resistant oil displacement agent features low interfacial tension, good temperature resistance, and a high degree of enhanced oil recovery.

The application discloses a preparation method of oil displacement and plugging integrated gel, and particularly relates to the technical field of oilfield chemicals, S1, reaction kinetics parameter solving; S2, dynamic topology network evolution simulation; S3, gel network crosslinking density calculation; S4, gel macroscopic mechanics parameter derivation; S5, pore throat scale plugging state determination. The application solves the reaction probability rate constant of initiation, chain growth, chain transfer and chemical crosslinking, and based on the dynamic simulation of the probability set starting time step promotion, realizes the recurrence of the growth of polymer chain and the network topology evolution process from the molecular reaction kinetics level. The microcosmic simulation mode starting from the chemical reaction mechanism replaces the traditional macroscopic mixing experiment, makes the formation process of the gel network transparent and traceable, and lays a foundation for deeply understanding the influence of the formula parameters on the network structure.

The application discloses a kind of oil reservoir gas drive fine delineation and gas channeling prevention and control method based on facies belt division.The method of the application can be used for the "fine" description of formation fluid migration in the process of CO2 injection development, through long core displacement, interface tension determination is combined, and well stream component is determined, the distribution of each facies zone in the ground is obtained through numerical simulation, accurate gas channeling early warning can be realized, and the starting pressure gradient at different development moments can be obtained in combination with the determined starting pressure gradient;The carbonized water is prepared by generating and breaking CO2 micro-bubbles in the application, and the enhanced CO2 micro-bubbles are generated by using the carbonized water and CO2, which can avoid the influence of water lock effect, improve the stability of micro-bubbles, better play the plugging and profile control effect, and improve the oil displacement efficiency, for the treatment of gas channeling, which is helpful to further improve the recovery efficiency and CO2 storage effect.

The present application relates to the technical field of enhanced oil recovery, in particular to a carbon dioxide viscosity-increasing regulator, an oil displacement agent, application thereof, a method for increasing carbon dioxide viscosity and a carbon dioxide-in-oil dispersion system. The carbon dioxide viscosity-increasing regulator comprises at least one compound represented by formula (I); (R1) a (DO j PO k EO h ) b [X1(C=OR2) c (C=O) d (X2) e R3] f Formula (I). The carbon dioxide viscosity-increasing regulator reduces the interfacial tension between crude oil and carbon dioxide, and the oil displacement agent formed by carbon dioxide is applied to crude oil exploitation, which is conducive to the dispersion of carbon dioxide in crude oil to form a carbon dioxide-in-oil dispersion system. The viscosity of carbon dioxide in the carbon dioxide-in-oil dispersion system is 1-2000 times the viscosity of carbon dioxide under the same temperature and pressure conditions.

This invention relates to the field of oilfield development technology, and discloses a polymer with viscosity-reducing function, its preparation method, and its application. The polymer has the structural units shown in Formulas 1 and 2. Oil displacement agents containing this polymer exhibit high static viscosity reduction, high oil recovery, salt resistance, and high-temperature resistance.

This invention provides a viscosity reducer, an oil displacement composition containing the same, and an oil displacement method. The monomer units of the viscosity reducer include acrylamide, sodium p-styrene sulfonate, and 4-allyl-2,6-dimethoxyphenol. The viscosity reducer, together with polyacrylamide with a weight-average molecular weight of 12 million to 15 million g / mol and soft particles with a particle size of 0.2 to 30 μm, constitutes an oil displacement composition. The oil displacement composition exhibits strong viscosity-reducing, oil-washing, and cross-flow control capabilities, achieving a viscosity reduction rate of up to 94.25% for heavy oil below 2000 mPa·s (50°C). The resulting low-viscosity emulsion obtained after mixing with heavy oil demonstrates good stability, with a minimum water separation rate of 17.00% within 1 hour. The oil displacement method involves sequentially injecting a sacrificial slug, an oil displacement slug, and a flow control slug into the reservoir. During implementation, the injection pressure significantly increases and stabilizes, resulting in an enhanced oil recovery rate of up to 38.72% in laboratory settings.

The present disclosure provides a spring fork comprising a fork leg, which includes an upper tube and a lower tube that are in sliding engagement with each other for compression and rebound; a damper assembly positioned in the fork leg, the damper assembly comprising a shaft and a sealing head coupled to the shaft; and a reservoir configured to hold bath oil near the sealing head. The sealing head is dimensioned and positioned to fling the bath oil upwards when the sealing head is driven into the bath oil during compression of the spring fork. The sealing head comprises a base section and a front section that tapers downwards from the neck. The hydrodynamic profile of the sealing head generates controlled oil displacement profiles by which lubricating oil is distributed to internal components, including bushings, seals, and sliding surfaces, during a suspension movement.

The application provides a metal-carbon skeleton nano-microparticle and a preparation method thereof, and belongs to the field of nanometer material preparation, wherein the metal-carbon skeleton nano-microparticle is prepared from raw materials through a solvothermal reaction; the raw materials comprise, in percentage by mass, 3-15% of polymerizable monomers, 0.05-1.5% of initiators, 0.01-1.5% of metal salts and the balance of solvents; the active functional groups of the polymerizable monomers comprise nitrogen and / or oxygen; and the metal salts comprise at least one of aluminum salts, zirconium salts, chromium salts and zinc salts. The application uses metal ions and organic precursors containing active groups as raw materials, realizes controllable adjustment of the particle size of the nano-microparticles in the range of 1-5000 nanometers through metal crosslinking, induced nucleation and in-situ carbonization processes. The preparation process of the application is simple and controllable, the obtained nano-microparticles are uniform in size, stable in structure, high in temperature resistance and salt resistance, and can be widely applied in the fields of catalysis, sensing or oil displacement.

The application discloses a surfactant oil displacement agent for viscoelastic binary composite flooding and a preparation method thereof, and relates to the technical field of oil exploitation. The oil displacement agent is a polymer and surfactant binary composite system, which is compounded by a water phase and an oil phase in a specific proportion. The water phase accounts for 5-45% and the oil phase accounts for 55-95% to expand the range. The water phase contains alcohol and water, and the oil phase contains a surfactant, a self-made thickening agent and white oil. Through reasonable compounding of components and optimization of the preparation process, the application solves the technical problems of poor temperature resistance and salt resistance, weak environmental protection and high cost of the existing viscoelastic surfactant, has excellent viscoelasticity, oil washing efficiency and environmental compatibility, can significantly reduce the oil / water interfacial tension, promote the desorption and dispersion of crude oil, improve the recovery rate, and is suitable for high-temperature and high-salt oil reservoir exploitation.

This invention discloses an amphiphilic nano-displacement agent for low-permeability oil reservoirs, its preparation method, and its application, belonging to the field of nanomaterial-based oil displacement technology. The agent is surface-modified nano-silica grafted with silane coupling agents containing quaternary ammonium groups and fluorocarbon chains. The nano-silica particles have a diameter of 5-10 nm and a purity ≥99 wt%. Preparation employs a one-pot, multi-step method, where the nano-silica is dispersed and then reacted sequentially with two hydrolyzed silane coupling agents. The product is obtained after centrifugation, drying, and grinding. This agent, formulated into a 20-500 mg / L dispersion, improves rock wettability and inhibits clay swelling, achieving pressure reduction and enhanced injection in low-permeability oil reservoirs, increasing oil recovery, and solving the problems of high water injection pressure and low recovery rate in low-permeability oil reservoirs. Furthermore, the preparation process is simple and low-cost, making it suitable for field application in oilfields.

This invention provides an environmentally friendly oilfield displacement agent and its preparation method. The displacement agent comprises the following components in parts by weight: 0.1-0.5 parts modified cellulose, 40-60 parts amphoteric surfactant, and 50-70 parts water. The displacement agent prepared by this invention exhibits low interfacial tension, high oil recovery, and good high-temperature and high-salt stability. This indicates that the invention, through the synergistic effect of the amphoteric surfactant and modified cellulose, reduces the oil-water interfacial tension, effectively improving oil washing efficiency. The introduction of sulfonic acid groups into the amphoteric surfactant and modified cellulose allows the displacement agent to maintain good performance even at high temperatures and high salinity. Furthermore, the displacement agent prepared by this invention poses no environmental residue risk and demonstrates excellent environmental performance.

The invention belongs to the technical field of imbibition oil extraction, and provides a water-based nano-emulsion imbibition oil displacement agent and a preparation method thereof. According to the preparation method of the water-based nano-emulsion imbibition oil displacement agent, polyoxyethylene lauryl ether, sorbitan monopalmitate, mahogany petroleum sulfonate, an oily solvent, nano silicon oxide and water are uniformly mixed through a phase transition component method to prepare the water-based nano-emulsion imbibition oil displacement agent. The preparation method of the water-based nano-emulsion imbibition oil-displacing agent can effectively improve the crude oil recovery rate of unconventional oil reservoirs.

This invention relates to a knowledge graph-driven intelligent molecular design method for oil displacement agents. It involves integrating multi-source heterogeneous data from experiments, literature, and oilfield sites. Through cleaning, standardization, and entity relationship extraction, a knowledge graph for oil displacement is constructed, deeply integrating molecular structure, functional group attributes, performance indicators, and reservoir environmental parameters. Using graph computing and graph neural network technologies, hidden association rules are mined from the graph, establishing an interpretable mapping model from molecular microstructure to macroscopic performance and environmental adaptability. Finally, based on the established mapping relationships, and with target reservoir conditions and performance requirements as multiple constraints, candidate molecular structural features are generated through reverse reasoning, achieving knowledge-guided precise molecular design. This invention constructs a knowledge graph for oil displacement, revealing the complex intrinsic relationships between molecular functional groups, reservoir environment, and oil displacement performance. Through the combination of knowledge graphs and intelligent algorithms, it achieves intelligent and automated molecular design of oil displacement agents.

This invention relates to the field of oilfield development technology and discloses a modified nano-displacement agent and its application in oil well production enhancement. The agent comprises 5.0–10.0 wt% succinate gemini polyoxyethylene ether, 3.0–5.0 wt% erucamide propyl hydroxysulfonate betaine, 10.0–20.0 wt% polyether-modified silicone oil, 1.0–3.0 wt% sodium xylenesulfonate, 1.0–2.0 wt% 1,2-propanediol, and 60.0–80.0 wt% deionized water. During preparation, a phase-conditioning fluid is added via high-shear emulsification combined with a cooling jet to obtain a nanoscale dispersion system. This invention utilizes the combination of gemini surfactant and betaine to improve phase stability under high temperature and high salinity conditions and effectively reduce interfacial tension; the steric hindrance of the modified silicone oil reduces formation adsorption losses; and the nanoscale droplets can penetrate deep into the micro- and nano-pore throats of low-permeability formations to strip crude oil, alleviating injection difficulties and synergistically achieving increased oil well production.