20 results about "Co2 responsive" patented technology

The invention discloses a multi-site intelligent response type CO2 gas channeling prevention gel and a preparation method, and belongs to the field of chemical oil displacement, and the preparation method comprises the following steps: taking a carbon dioxide response type monomer, acrylamide and sodium acrylate as monomers, and adopting water-soluble free radical polymerization to prepare a CO2 response type copolymer; the CO2 response type copolymer, a cross-linking agent, a stabilizer, a retarder and formation water are prepared into a polymer cross-linking agent mixed solution, a cross-linking reaction is carried out under the conditions of formation temperature and mineralization degree, and the multi-site intelligent response type CO2 gas channeling prevention gel is obtained. The gel effectively solves the problems that a traditional anti-channeling agent is poor in injectivity in a low-permeability and ultra-low-permeability oil reservoir and cannot achieve deep channeling sealing, CO2 gas channeling fractured channels can be effectively blocked, the carbon dioxide oil displacement effect is remarkably improved, and key technical support is provided for large-scale application of carbon dioxide displacement.

The invention discloses a kind of CO2 responsive type gemini imidazoline surfactant and its application in fracturing fluid, tetraethylene pentamine and long-chain fatty acid are fed, using the dimethylbenzene of mass equal to long-chain fatty acid as water-carrying agent, being warming up to 125~140 DEG C and being refluxed, then continuing to be warming up to 190~220 DEG C and being reversed, being cooled to room temperature successively, obtain gemini imidazoline viscous liquid;Step 2:3 chloro-2 hydroxypropyltrimethylammonium chloride and the composition solution of acetone of equal mass are added dropwise to the gemini imidazoline of step one while stirring, then equimolar acid binding agent is added, reacted at room temperature, being warming up to 56~60 DEG C and distilling out acetone, CO2 responsive type gemini imidazoline surfactant can be obtained.The present invention can be used for the thickening agent of clean fracturing fluid, while improving the viscoelasticity of surfactant as thickening agent for preparing clean fracturing fluid, and the clean fracturing fluid formed is obviously stronger acidic, can dissolve the inorganic blockages such as carbonate rock in partial stratum.

The invention discloses a carbon dioxide detection sensor and method based on a coated fiber bragg grating, the sensor comprises a single-mode fiber, and the single-mode fiber comprises a fiber core, a cladding and a hollow capillary sleeve sleeving the cladding; the middle section of the single-mode optical fiber is provided with a fiber core exposed section, the fiber core of the exposed section is provided with a Bragg grating FBG and a polymer coating expanded in response to carbon dioxide, the exposed section is coated with a sleeve, the sleeve is hermetically connected with the hollow capillary sleeves at the two ends, the sleeve is provided with an air inlet and an air outlet, and the air inlet and the air outlet are communicated with the hollow capillary sleeves. And a temperature sensor is arranged between the sleeve and the polymer coating. The CO2 detection sensor provided by the invention can achieve the effects of high precision of less than or equal to 5 ppm and quick response of less than or equal to 5 s, can meet the requirement of quick change scene monitoring, and is easy to maintain.

The present invention discloses a CO2-responsive adsorbent material, a preparation method thereof, and its application in treating wastewater containing surfactants. The CO2-responsive adsorbent material of the present invention comprises a base sponge and a CO2-responsive polymer. The base sponge is a dopamine-coated sponge grafted with 2-bromoisobutyryl bromide. The CO2-responsive polymer is a homopolymer of any one monomer selected from a primary amine system, an amidine / guanidine system, a tertiary amine system, or a nitrogen-containing azole heterocyclic system, or a copolymer of two or more monomers. When used to treat wastewater containing anionic surfactants, the CO2-responsive adsorbent material of the present invention has a high adsorption capacity, is simple to operate, and is relatively low in cost.

A gas-responsive nano-emulsion separation membrane and its application method, the present application belongs to the field of chemical separation technology, specifically relates to oil-water separation membrane. The separation membrane is woven by polar yarn, the surface of the polar yarn is covered with a polymer coating, the polymer coating is prepared by polymerization reaction of carbon dioxide responsive monomer and hard end monomer; the carbon dioxide responsive monomer is a monomer containing end double bond and tertiary amine response group; the hard end monomer is an unsaturated carbonyl compound containing end double bond; the sum of the warp density and the weft density of the woven is between 300T-400T, the pore size distribution of more than 80-90% of the separation membrane is 0.1-0.3um; the separation membrane is used for separating nano-scale dispersed phase emulsion, the nano-scale dispersed phase emulsion is oil-in-water emulsion or water-in-oil emulsion with dispersed phase particle size of 20nm-50nm. The separation membrane has switchable surface wettability, and can realize on-demand separation of water-in-oil emulsion and oil-in-water emulsion by adjusting the surface wettability.

A surfactant with carbon dioxide-responsive viscosity-increasing properties and its application in fracturing fluids comprises the following steps: step 1: adding ethanol as a solvent, sequentially adding cyanuric chloride and a long-chain fatty amine while stirring, controlling the reaction in an ice-water bath, adjusting the pH of the reaction system to 8-9 with a base during the reaction, and terminating the reaction to obtain an intermediate product (I); step 2: adding hydroxyethylpiperazine to the intermediate product (I), stirring and mixing, heating the mixture to 30-40°C, and maintaining the temperature for 1-2 hours. Ethanol is then distilled off and recovered while heating the mixture until the temperature reaches 80-95°C, and the temperature is maintained for 5-6 hours. During the reaction, the pH of the reaction system is adjusted to 8-9 with a base, and the reaction is terminated to obtain a surfactant with carbon dioxide-responsive viscosity-increasing properties. The present invention improves the protonation rate of tertiary amine groups, so that the surfactant molecules contain more tertiary amine groups to form multiple cations, which further improve the viscosity-increasing effect and salt resistance by forming more stable worm-like micelles with small molecule salts.

The invention provides a carbon dioxide self-healing material as well as a preparation method and application thereof. The carbon dioxide self-healing material comprises a base material and a coating material coating the surface of the base material, the base material is prepared from the following raw materials: an acrylamide monomer, a first acrylate monomer and a first carbon dioxide responsive compound; the coating material is prepared from the following raw materials: a second acrylate monomer and a second carbon dioxide responsive compound. The carbon dioxide self-healing material has excellent mechanical performance and good adhesion performance with an inorganic interface, can improve the gas channeling resistance of cement and regulate the thickening performance of the cement, has good responsiveness to carbon dioxide, can realize cement self-repairing, prevents the corrosion of carbon dioxide to the cement, and has a good application prospect. And oil and gas channeling caused by microcracks in set cement can be effectively prevented and controlled.

The invention discloses a CO2 responsive polymer for geological sequestration leakage plugging and a preparation method thereof. The polymer is prepared from dimethylaminoethyl methacrylate, acrylamide, methyl methacrylate, a cross-linking agent and an initiator through free radical polymerization. The preparation method comprises the following steps: dissolving each monomer in a mixed solvent of deionized water and absolute ethyl alcohol, removing oxygen, adding an initiator, and reacting at 50-70 DEG C for 20-28 hours. The polymer is a low-viscosity liquid when not in contact with CO2, and has good injectability; and after contacting CO2, the viscosity is obviously increased and even a physical cross-linked network is formed, so that a leakage channel can be effectively blocked. The polymer is good in thermal stability, simple in preparation process and suitable for the field of CO2 geological storage leakage plugging.

The application discloses a carbon dioxide responsive hollow fiber emulsion separation membrane and a preparation method thereof. The separation membrane comprises a hollow fiber membrane substrate and a carbon dioxide responsive polymer layer covalently grafted on the surface of the substrate, the polymer layer comprises a tertiary amine group and forms a covalent connection comprising a Si-O bond with the surface hydroxyl group of the substrate through hydrolysis condensation of a hydrolysable silane group. The preparation method comprises the following steps: synthesizing a silane-terminated carbon dioxide responsive polymer; performing surface hydroxylation activation on the hollow fiber membrane substrate; and after pre-hydrolysis of the polymer in an ethanol / water system, reacting the polymer with the activated membrane to realize covalent grafting through silane bridging. The separation membrane can be reversibly switched between a hydrophobic oleophilic state and a hydrophilic underwater oleophobic state through carbon dioxide and nitrogen bubbling or heating treatment in a water environment, and is used for separating a water-in-oil emulsion (W / O) and an oil-in-water emulsion (O / W).

The invention relates to the technical field of cement self-repairing, in particular to CO2 response type anti-crack self-repairing cement and a preparation method thereof. Mixing the solution 2 serving as mixing water with oil well cement, or adding the gel freeze-dried powder into water to serve as mixing water to be mixed with the oil well cement, so as to prepare the CO2 response type anti-cracking self-repairing cement. The preparation method comprises the following steps: adding a carboxyl-containing vinyl monomer and a tertiary amine-containing vinyl monomer into water, and uniformly mixing to obtain a monomer mixed solution; adding a cross-linking agent, uniformly mixing to obtain a solution 1, adding an initiator, and uniformly mixing to obtain a solution 2; and standing to obtain hydrogel, washing, centrifuging, and freeze-drying to obtain gel freeze-dried powder. After the CO2 response type anti-crack self-repairing cement is hydrated, the gel can capture carbon dioxide in a cement matrix, calcium ion mineralization is promoted, and the self-repairing performance is better. Compared with a traditional cement self-repairing system, the system has the characteristics of carbon dioxide responsiveness and the like.

The present application belongs to the technical field of oil exploitation, and particularly relates to a carbon dioxide responsive core-shell polymer gas channeling regulator and a preparation method thereof. The raw materials include an ionic hydrophilic monomer, an amine group-containing CO2 responsive monomer and a pair of orthogonal reaction monomers (A-B). Through the design of RAFT polymerization combined with emulsion polymerization and the introduction of the pair of orthogonal reaction monomers (A-B), the structure controllability and function synergy are realized. The prepared regulator contains a hydrophilic shell layer and a hydrophobic core layer. When CO2 is not passed, monomers A and B do not react due to spatial isolation, and the solution is in a low-viscosity stable state. After CO2 is passed, the amine group-containing CO2 responsive monomer in the core layer is protonated, the core layer is gradually hydrophilized, the particle is water-swelled and the particle size is increased. When the core layer is completely protonated, the particle is dissolved, monomers A and B are contacted and orthogonal reaction occurs, the hydrophilic polymer chain is crosslinked to form a three-dimensional hydrogel network, the solution viscosity is increased, and the problem of gas channeling caused by strong reservoir heterogeneity during CO2 flooding can be effectively solved.

The invention belongs to a preparation method of a fresh-keeping material, and particularly relates to a preparation method of chitosan-based aerogel capable of triggering controlled release of citral in a CO2 responsive manner, which comprises the following steps: synthesizing carboxylated carbon nanotube / chitosan aerogel from chitosan and carboxylated carbon nanotubes, loading citral, and drying to obtain the chitosan-based aerogel capable of triggering controlled release of citral in a CO2 responsive manner. Citral / carboxylated carbon nanotube / chitosan aerogel is obtained, the citral / carboxylated carbon nanotube / chitosan aerogel is loaded with a CO2 responsive polymer, and the CO2 responsive polymer / citral / carboxylated carbon nanotube / chitosan aerogel is obtained. The problems that an existing environment response type fresh-keeping material is poor in environment responsiveness and difficult to recycle are solved. The method has the advantages that acid-sensitive Schiff base bonds are triggered to break after a large amount of CO2 is adsorbed, rapid and large-amount release of Cit is achieved, microbial growth is efficiently inhibited, and the storage time of mangoes is prolonged; after the Cit is completely released, the Cit can be loaded again, so that the recycling of the aerogel is realized, and the like.

The invention discloses well killing fluid for preventing carbon dioxide gas channeling, and relates to the technical field of well killing fluid. The density regulator is prepared from the following components in parts by mass: 10 to 80 parts of density regulator; 0.8-2 parts of a multifunctional polymer; 1-5 parts of a starch-based filtrate reducer; 100 parts of water; the preparation method of the multifunctional polymer comprises the following steps: taking polyethylene glycol diglycidyl ether and secondary amine, carrying out a two-ring-opening addition reaction to obtain an intermediate, then taking the intermediate and acryloyl chloride in a molar ratio of 1: (1-1.1), and carrying out a reaction to obtain a reaction monomer; acrylamide and a reaction monomer are taken and subjected to free radical polymerization under the action of an initiator, and the multifunctional polymer is obtained. The well killing fluid provided by the invention has the advantages of low corrosion rate, good temperature resistance, low filter loss and good carbon dioxide response performance.

The application discloses a carbon dioxide channeling prevention well killing fluid and relates to the technical field of well killing fluids.The carbon dioxide channeling prevention well killing fluid comprises, in mass parts, 10-80 parts of a density regulator, 0.8-2 parts of a multifunctional polymer, 1-5 parts of a starch-based fluid loss additive, and 100 parts of water, wherein the multifunctional polymer is prepared through the following steps: taking polyethylene glycol diglycidyl ether and a secondary amine to perform a di-ring-opening addition reaction to obtain an intermediate, then taking the intermediate and acryloyl chloride in a molar ratio of 1:1-1.1 to perform a reaction to obtain a reaction monomer; and taking acrylamide and the reaction monomer to perform free radical polymerization under the action of an initiator to obtain the multifunctional polymer.The well killing fluid has a low corrosion rate, good temperature resistance, a low fluid loss and good carbon dioxide response performance.

The application discloses a kind of carbon dioxide detection sensor and method based on coating fiber bragg grating, the sensor includes single-mode optical fiber, single-mode optical fiber includes core, cladding and hollow capillary sleeve sleeved outside cladding;The middle section of the single-mode optical fiber is provided with a core exposed section, a bragg grating FBG is arranged on the core of the exposed section, and a carbon dioxide response expansion polymer coating is provided, and a sleeve is coated outside the exposed section, the sleeve is sealingly connected between the hollow capillary sleeve at both ends, the sleeve is provided with air inlet and outlet hole, and a temperature sensor is arranged between the sleeve and the polymer coating.The CO2 detection sensor of the application can achieve high precision ≤5 ppm, fast response ≤5 s effect, can meet the monitoring of rapidly changing scene, and is easy to maintain.

This invention discloses an in-situ modified nanoparticle CO2 foam sealing system, which is composed of the following materials: 1-5 wt% nonionic CO2 responsive surfactant; 5-10 wt% nanoparticles; 0.1-1 wt% anionic foaming agent; 1-5 wt% salt ion additive; and the balance is water. This invention discloses a method for preparing the in-situ modified nanoparticle CO2 foam sealing system, which includes the following steps: (1) adding the prescribed amount of nonionic CO2 responsive surfactant and the prescribed amount of anionic foaming agent to the prescribed amount of water, and stirring evenly to obtain a mixture a; (2) adding the prescribed amount of nanoparticles to mixture a, stirring and sonicating until completely dispersed to obtain mixture b; (3) adding mixture b to a high-temperature and high-pressure foam reaction vessel, introducing high-pressure CO2, and stirring to obtain an acidic mixture c; (4) after standing, the in-situ modified nanoparticle CO2 foam sealing system is obtained.

A method of acid stimulation that includes: injecting a first acid into a subterranean carbonate formation, the first acid dissolving a first portion of a carbonate material in the subterranean carbonate formation to form a first group of channels in a first zone within the subterranean carbonate formation while generating carbon dioxide (CO2); injecting a diverting agent into the first group of channels, the injected diverting agent reacting with the CO2 and forming a gel to seal the first group of channels; and injecting a second acid into the subterranean carbonate formation, the second acid dissolving a second portion of the carbonate material in the subterranean carbonate formation to form a second group of channels in a second zone within the subterranean carbonate formation, the second zone having a permeability lower than the first zone, the gel blocking the second acid from entering the first group of channels.

The invention discloses a carbon dioxide response type foam fracturing fluid system as well as a preparation method and application thereof, and belongs to the technical field of fracturing fluid. The fracturing fluid system comprises a gas phase and a liquid phase, the gas phase is carbon dioxide, and the liquid phase is a base fluid; based on the total mass of the base solution being 100%, the base solution comprises the following components: 0.1%-0.5% of a foaming agent, 0.3%-2% of a main foam stabilizer, 0.15%-1% of an auxiliary foam stabilizer, 0.1%-2% of a clay stabilizer and the balance of water. The preparation method of the fracturing fluid system comprises the following steps: adding a foaming agent and a clay stabilizer into water, then adding a main foam stabilizer, and then adding an auxiliary foam stabilizer to obtain a base fluid; and introducing carbon dioxide into the base fluid to obtain the fracturing fluid system. The fracturing fluid system can be applied to unconventional oil and gas reservoir fracturing operation, and has the advantages of cleanness, low damage to oil and gas reservoirs, carbon dioxide response and the like.

The invention belongs to the technical field of oil exploitation, and particularly relates to a carbon dioxide response type core-shell polymer gas channeling regulating agent and a preparation method thereof. The raw materials comprise an ionic hydrophilic monomer, an amino-containing CO2 response monomer and an orthogonal reaction monomer pair (A-B). Through the design of combining RAFT polymerization with emulsion polymerization and the introduction of an orthogonal reaction monomer pair (A-B), the structure controllability and function synergy are realized. The prepared regulating agent contains a hydrophilic shell layer and a hydrophobic core layer, when CO2 is not introduced, the monomer A and the monomer B do not react due to spatial isolation, and the solution is in a low-viscosity stable state. After CO2 is introduced, the amido-containing CO2 response monomer in the core layer is protonated, the core layer is gradually hydrophilized, the particles absorb water and swell, and the particle size is increased. When a core layer is completely protonated, particles are dissolved, the monomer A and the monomer B are in contact and are subjected to orthogonal reaction, so that a hydrophilic polymer chain is crosslinked to form a three-dimensional hydrogel network, the viscosity of a solution is increased, and the problem of gas channeling caused by high heterogeneity of an oil reservoir of CO2 flooding can be effectively solved.

A method of acid stimulation that includes: injecting a first acid into a subterranean carbonate formation, the first acid dissolving a first portion of a carbonate material in the subterranean carbonate formation to form a first group of channels in a first zone within the subterranean carbonate formation while generating carbon dioxide (CO2); injecting a diverting agent into the first group of channels, the injected diverting agent reacting with the CO2 and forming a gel to seal the first group of channels; and injecting a second acid into the subterranean carbonate formation, the second acid dissolving a second portion of the carbonate material in the subterranean carbonate formation to form a second group of channels in a second zone within the subterranean carbonate formation, the second zone having a permeability lower than the first zone, the gel blocking the second acid from entering the first group of channels.