48results about How to "High anti-expansion rate" patented technology

The present invention relates to a preparation method of a clay stabilizer for low permeability stratum. The preparation method sequentially comprises: adding epichlorohydrin to the aqueous solution of a monoaliphatic amine, carrying out a reaction for a certain time, adding epichlorohydrin, heating, carrying out a reaction, adding polyamine, adding epichlorohydrin, carrying out a reaction, and drying to obtain the clay stabilizer.

The invention provides solidified water temporary plugging well-killing working fluid. The solidified water temporary plugging well-killing working fluid is prepared from 10 to 40 percent of solidified water system and 60 to 90 percent of anti-swelling stabilizing fluid, wherein the solidified water system is prepared from the following components in percentage by mass: 1.1 to 1.5 percent of main agent, 0.3 to 0.5 percent of solidification initiator and the balance of water. The preparation method of the working fluid comprises the following steps: 1), taking the main agent in an amount determined in a formula; 2) taking the solidification initiator and the anti-swelling agent in amounts determined in the formula; 3) injecting clear water into a container in an amount determined in the formula, adding the main agent and the solidification agent initiator in amounts determined in the formula in sequence, and uniformly stirring to obtain the solidified water system; 4) adding the anti-swelling stabilizing fluid in an amount determined in the formula to obtain the solidified water temporary plugging well-killing working fluid. A draining method combining acidifying-demulsifying and liquid nitrogen drainage is adopted. The working fluid is simple in preparation process, a colloid protective agent is not needed, the plugging efficiency is increased greatly, the plugging cost is lowered, damage to strata is reduced, and the problems of coexistence of collapse and leakage and low reservoir protection performance in a gas well construction process are solved. The solidified water temporary plugging well-killing working fluid has important practical significance to increase of the oil gas exploration and development speeds.

The invention belongs to the technical field of oilfield development, and in particular relates to a cation-type anti-swelling clay stabilizer containing N-heterocyclic quaternary ammonium salt and a synthesis method thereof. The clay stabilizer is generated by performing reaction between anhydride naphthalene and dodecanol to generate dodecyl anhydride naphthalene half-ester, performing solution polymerization reaction with 2-(dimethylamino)chloromethane hydrochloride to generate an intermediate, and finally performing reaction with 2-bromomethylpyridine, wherein the molar ratio of the anhydride naphthalene to the dodecanol to the 2-(dimethylamino)chloromethane hydrochloride to the 2-bromomethylpyridine is 1:1-1.6:1.1-1.5:0.8-1.7, preferably 1:1.1:1.2:1.5. The clay stabilizer is characterized by wide source of raw materials, simple synthesis process, small usage and high reservoir adaptability. The clay stabilizer is good in temperature resistance and salt resistance, the temperature of 220 DEG C can be resisted, the degree of mineralization of 220000mg / L can be resisted, and the compatibility is excellent. The clay stabilizer can be strongly adhered to the surface of clay, is not prone to decomposition, and is long in duration and high in anti-swelling rate which exceeds 98 percent.

The invention discloses a sand inhibiting and antiswelling agent and a preparation method thereof, which are used for acidification of oil-water wells. The sand inhibiting and antiswelling agent is formed by mixing terpolymer with amine salt generated from the reaction between organic amine and HCL in a molar ratio of 1:2, wherein the amine salt accounts for 98% of the total weight, and the terpolymer accounts for 2% of the total weight. The terpolymer is the one prepared from an acrylamide monomer or a 2-acrylamido-2-methyl propane sulfonic acid monomer, a dimethyl diallyl ammonium chloride and an organic silane coupling agent. Experiments prove that the antiswelling rate of the sand inhibiting and antiswelling agent is higher than 85%, and the sand inhibiting rate is higher than 90%. Clay swelling can be effectively prevented, sand production from fine-silty sand can be controlled, and the sand inhibiting and antiswelling agent is suitable for loose sand oil deposit acidizing operation under middle / low-grade sand production strength.

The invention provides preparation of a clay anti-swelling agent with an oil washing effect and for water injection. According to the clay anti-swelling agent, the composition use of a self-synthesized clay anti-swelling cationic surfactant and cheap ammonium phosphate, ammonium chloride and potassium chloride is disclosed, and the agent has the better capability of preventing hydration and swelling of clay particles; in composition with dodecyl ethoxy betaine and propylene glycol polyoxyethylene polyoxypropylene ether demulsifier, the clay anti-swelling agent not only has the oil washing function but also prevents emulsification and achieves the effect of avoiding the situation that blockage damage is caused by emulsification during oil washing; in composition with a trimethyl-1-propanaminium iodide surfactant, the clay anti-swelling agent has the excellent capability of reducing surface tension and interfacial tension and greatly reduces and prevents water lock damage. Thus, the developed clay anti-swelling agent has the triple effects of preventing clay swelling, reducing the surface tension and the ultra-low interfacial tension to prevent water lock and to wash oil, and the agent plays an innovative demonstration role in developing the multifunctional clay anti-swelling agent for water injection.

The present invention discloses a double protection type perforation fluid, which comprises the following components, by mass, 100 parts of water, 0.2-0.5 part of a tackifier, 0.8-2 parts of a filtrate reducer, 2-3 parts of an anti-swelling agent, 0.05-0.15 part of a surface active agent and 0.05-0.2 part of a gel breaker. The double protection type perforation fluid has the following characteristics that: the double protection type perforation fluid has a certain viscosity so as to provide good effects of cleaning and chip carrying while ensure pumping; filter loss is low so as to minimize damage on stratum by the filtrate; anti-swelling rate is high so as to inhibit clay hydration expansion; interfacial tension is low so as to facilitate fluid flowback and reduce water blocking damage; with automatic polymer degradation and gel breaker application, damage caused by polymer adsorption are eliminated; and core permeability recovery rate is high, and a good protection effect is provided for the oil layer so as to solve problems of damage on the stratum and environment pollution caused by stratum pore channel surface absorption of high molecular polymers in the polymer perforation fluid polymer.

The invention discloses an oil reservoir protection accelerator and a preparation method of the oil reservoir protection accelerator. The oil reservoir protection accelerator comprises the following components in percentage by weight: 0.1-1.0 percent of polyepichlorohydrin-dimethylamine, 0.5-2.0 percent of ammonium chloride, 0.1-0.5 percent of a surfactant, 5-15 percent of ethanol, and the balance of water. The oil reservoir protection accelerator is relatively-high in anti-swelling rate and anti-scouring degree, and can reduce the surface tension of working solutions and increase the filtration capacity of the working solutions; the water sensitivity and water blocking damages of a reservoir are greatly reduced, the aim that the protective reservoir is prevented from being damaged due to invasion of the working solutions is fulfilled, and the requirement of oil reservoir protection in a construction operation process of low-porosity and low-permeability reservoirs is met. The oil reservoir protection accelerator can be used in various measure working solutions in an oil field production process, can also be used as an addictive of the measure working solutions such as acidification, crushing, water plugging and profile control, and has functions of protecting stratum and preventing the stratum from being damaged in an operation process.

The invention relates to a preparation method of a stable oil displacement agent for clay and application thereof. The preparation method comprises the following steps: heating 150-300 parts of primary amine to 30-80 DEG C, dripping 114-171 parts of olefine acid or ethylacrylate to the primary amine, allowing the mixed solution to react at the temperature of 80-115 DEG C for 3-9h, adding 60-321 parts of monoethanolamine, diethanolamine or triethanolamine or any two mixtures thereof, stirring evenly, adding 1.3-10.2 parts of sodium ethylate or potassium ethylate to react at the temperature of 90-165 DEG C for 2-6h, additionally adding 24-78 parts of dichloroethane, stirring evenly, adding 80-224 parts of potassium hydroxide to react at the temperature of 100-160 DEG C for 5-12h to obtain the stable oil displacement agent for clay. The stable oil displacement agent for clay is applied to oil extraction by water flooding in oilfield. The stable oil displacement agent for clay prepared by the method has lower interfacial tension and higher anti-swelling property.

The invention discloses a small-molecular liquid anti-swelling agent, a clay anti-swelling agent for fracturing and a preparation method. The anti-swelling agent comprises the following components byweight percent: 10-65% of alkyl hydroxypropyl quaternary ammonium salt, 1-10% of guanidine hydrochloride, 1-10% of nonionic surfactant and the balance of water, wherein the nonionic surfactant is alkylphenol polyoxyethylene or fatty alcohol-polyoxyethylene ether with 8-18 alkyl carbon atoms and degree of polymerization within 8-20. The liquid anti-swelling agent disclosed by the invention is composed of small-molecular components, has the characteristics of low relative molecular weight, no harm to hydrocarbon reservoir and convenience in onsite preparation, and is low in dosage and high in anti-swelling rate; the anti-swelling rate of an anti-swelling rate aqueous solution can reach up to 71%; after the liquid anti-swelling agent is compounded with an inorganic salt, the anti-swelling rate can reach up to 79%; the small-molecular liquid anti-swelling agent is specially suitable for fracturing modification of low-permeability and water-sensitive stratum.

The invention relates to the field of oilfield workover, discloses anti-water-lock workover fluid and a preparation method, and aims to solve the technical problem of low temperature resistance of the anti-water-lock workover fluid in the prior art. The anti-water-lock workover fluid is prepared from the following components in percentage by weight: 0.3-0.6 percent of xanthan gum, 0.5-2.0 percent of high-temperature-resistant fluid loss agent, 0.2-0.5 percent of sterilizing agent, 0.2-0.5 percent of anti-water-lock agent, 0.5-2.0 percent of inhibitor, and the balance of water. The technical effect of improving the temperature resistance of the anti-water-lock workover fluid is achieved.

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to an anti-swelling clay stabilizer and a preparation method thereof. The preparation method comprises the following steps: sequentially adding benzaldehyde-2, 4-sodium disulfonate, sodium cyanoborohydride, dimethylamine and methanol into a reactor, heating, refluxing, and evaporating to dryness; adding allyl chloride, sodium sulfite, copper chloride and ethanol into the reactor, stirring, heating, refluxing and filtering; adding ethyl acetate, heating for dissolving, filtering, cooling the filtrate to below 10 DEG C, and separating out crystals; adding 3-[(3-acrylamidopropyl) dimethyl ammonium] propionate, water, TX-10 and MS-1, uniformly stirring, continuously stirring, simultaneously dropwise adding 10% of an initiator solution, after dropwise adding, heating to 50-55 DEG C, keeping the temperature for 2-3 hours, adding sodium sulfite, stirring for 0.5-1 hour, adding potassium chloride and ammonium sulfate, and stirring for dissolving to obtain the clay stabilizer. The clay stabilizer has the advantages of high anti-swelling rate, high temperature resistance and washing resistance.

The invention discloses a star-shaped polycation-based surfactant as well as a preparation method and application thereof. The surfactant is prepared through the following steps: dropwise adding a certain amount of a trimethylol propane-tri(3-aziridinylpropanoate) reaction solution into a reaction flask filled with a long-chain fatty primary amine ethanol solution and an acidic catalyst, and carrying out first-step aziridine ring-opening reaction; then adding a certain amount of a chloromethane (or benzyl chloride) reaction solution into a reaction solution and carrying out second-step amination reaction, wherein the obtained product is the star-shaped polycation-based surfactant.

The invention belongs to the technical field of oilfield exploitation, and particularly relates to a clay stabilizer and a preparation method thereof. The preparation method comprises the following steps: adding triethylene diamine, 30wt% hydrochloric acid and ethanol into a reactor, slowly dropwise adding epoxy bromopropane, after dropwise adding, slowly heating to 50-55 DEG C, keeping the temperature, and carrying out reduced pressure distillation until the mixture is dry, so as to obtain a viscous intermediate; the method comprises the following steps: adding ethanol and tert-butylphosphine into a reactor, heating and refluxing, and carrying out reduced pressure distillation to dryness to obtain a crude product; and adding n-hexane into the crude product, heating for dissolving, filtering, cooling the filtrate to below 10 DEG C, separating out crystals, and drying in a drying oven at 100-120 DEG C overnight to obtain the product. The clay stabilizer has the advantages that the preparation process is simple, the anti-swelling rate is high, and the anti-swelling rate reaches 98% or above under the condition that the use concentration is 0.5 wt%; the highest temperature resistance reaches 350 DEG C or above, and the anti-swelling rate after water washing can reach 92% or above.

The invention specifically relates to a clay stabilizing agent capable of preventing water-sensitivity damage and a preparation method thereof, belonging to the technical field of oilfield development. The anti-swelling clay stabilizing agent is prepared by compounding soybean oil modified surfactant, acetylacetone, calcium hydrate and water, wherein the soybean oil modified surfactant is a quaternary surfactant with a long-carbon-chain alkyl group and quaternary ammonium cations. The anti-swelling clay stabilizing agent has the characteristics of wide sources of raw materials, simple synthesis process and good adaptability to oil reservoirs; meanwhile, the anti-swelling clay stabilizing agent has good heat resistance and salt resistance, and can endure a temperature as high as 300 DEG C and salinity as high as 200, 000 mg / L; the anti-swelling clay stabilizing agent has good compatibility with stratum water and a high antiswelling rate, as high as 98.0% or above; and thus, the anti-swelling clay stabilizing agent is widely applicable to the technical field of oilfield exploitation.

The invention discloses a star compound carrying intensive charge and a preparation method thereof. The star compound is prepared according to the following steps: dropwise adding a certain amount oftrimethylolpropane-tris(3-aziridinyl propionate) reaction liquid into a reaction flask filled with a methylamine (or ethylamine) aqueous solution and an acid catalyst, so as to perform a first step ofan aziridine ring-opening reaction; then adding a certain amount of 3-chlorine-2-hydroxypropyl-trimethyl ammonium chloride into the reaction liquid, so as to perform a second step of a quarter of amination reaction. An obtained product is the star compound carrying the intensive charge.

The invention discloses a cationic surfactant with dense charges and a preparation method and applications thereof. The surfactant is prepared by the following steps: dropwise adding quantitative trihydroxymethyl propane-tri(3-aziridinyl propionate) reaction liquid into a reaction bottle, which is filled with an ethanol solution of long chain aliphatic primary amine and an acidic catalyst to carryout aziridine ring-opening reactions (first step); and then adding quantitative 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride into the reaction liquid to carry out quaternary amination reactions (second step). The reaction product is the cationic surfactant with dense charges.

The invention belongs to the technical field of oil field exploitation, and more specifically relates to an anti-swelling clay stabilizing agent, and a preparation method thereof. The anti-swelling clay stabilizing agent is composed of a biosurfactant, potassium stearate, ammonium nitrate, and water; wherein the biosurfactant is one selected from sophorolipid and rhamnolipid. The anti-swelling clay stabilizing agent is excellent in temperature resistance and salt resistance, wide in application range, long in effect lasting period, simple in using, small in using amount, low in cost, and simple in preparation technology, and can be widely used in the field of oil field exploitation technology.

The invention relates to the technical field of oil field development, and particularly relates to a temperature-resistant clay anti-swelling agent for acidification in an oil field. The clay anti-swelling agent is prepared by carrying out reaction on 1,5-dihydroxynaphthalene and an acrylic acid to generate an intermediate; then carrying out reaction on the intermediate and aniline through amidation reaction to prepare the clay anti-swelling agent, wherein the molar ratio of 1,5-dihydroxynaphthalene to the acrylic acid to the aniline is 1:(0.9 to 1.8):(1.1 to 1.4), preferably 1:1.2:1.2. The clay anti-swelling agent is characterized in that the anti-swelling agent has the advantages of simple preparation process, low cost, strong adaptability, strong stability, high temperature resistance and anti-swelling effect; the highest temperature resistance is up to 180 DEG C, and the anti-swelling ratio is up to 95 percent or above. Therefore, the temperature-resistant clay anti-swelling agent can be widely applied to a clay anti-swelling technique for acidification in the oil field.

The invention relates to a compound oil deposit antiswelling and sand inhibiting agent and a preparation method thereof. The compound oil deposit antiswelling and sand inhibiting agent is prepared from the following raw materials in parts by weight: 20 to 30 parts of epoxy chloropropane-trimethylamine polymers, 20 to 30 parts of cationized polyacrylamide, 20 to 30 parts of poly-dimethyl diallyl ammonium chloride, 37.5 parts of ammonium chloride, 3.75 parts of dibutyl phthalate, 2.27 to 2.75 parts of hydroxyethyl ethylenediamine, 1.0 to 1.25 parts of triethylene tetramine, 5 to 10 parts of graphite powder, 1 to 4 parts of methyl methacrylate, 2 to 5 parts of biuret 2-butoxyethyl acetate, 2 to 5 parts of N-zinc pentamethylene dithiocarba-piperdine complex and 5 to 10 parts of titanate coupling agents. The compound oil deposit antiswelling and sand inhibiting agent is adsorbed on the surface of viscosity particles; a layer of protecting film is formed on the surface, so that the viscosity particles are effectively protected; clay particles are prevented from hydration swelling.

The invention relates to the technical field of oilfield development, in particular to a clay anti-swelling agent for high temperature oilfield acidification. The clay anti-swelling agent is preparedby: reacting 1-naphthol with acrylic acid to generate naphtyl acrylate, and then carrying out amidation reaction with aniline, wherein 1-naphthol, acrylic acid and aniline are in a mole ratio of 1:0.9-1.5:1.1-1.3, preferably 1:1.1:1.2. The clay anti-swelling agent has the characteristics of simple preparation process, low cost, strong adaptability, strong stability, high yield, high temperature resistance and good anti-swelling effect, has yield of over 90%, can tolerate a highest temperature up to 210DEG C, and has anti-swelling rate up to 90% or more. Therefore, the clay anti-swelling agentprovided by the invention can be widely applied in clay anti-swelling process of oilfield acidification.

The invention belongs to the technical field of oilfield development, and specifically relates to a temperature-resistant and salt-resistant type anti-swelling clay stabilizer and a synthetic method thereof. The temperature-resistant and salt-resistant type anti-swelling clay stabilizer is prepared through the following steps of enabling phthalic anhydride to react with n-octyl alcohol, thus generating n-octyl phthalic anhydride hemi-ester; carrying out a solution polymerization reaction on the n-octyl phthalic anhydride hemi-ester and 2-(dimethylamino) chloromethane hydrochloride, thus generating an intermediate; finally enabling the intermediate to react with benzyl bromide, thus generating the temperature-resistant and salt-resistant type anti-swelling clay stabilizer, wherein a molar ratio of the phthalic anhydride, the n-octyl alcohol, the 2-(dimethylamino) chloromethane hydrochloride and the benzyl bromide is 1 to 1.1 to 1.3 to 1.6. The temperature-resistant and salt-resistant type anti-swelling clay stabilizer disclosed by the invention has the characteristics that the sources of raw materials are wide, a synthetic technology is simple, the dosage is less, and the oil reservoir adaptability is strong; the temperature-resistant and salt-resistant type anti-swelling clay stabilizer is good in temperature resistance and salt resistance, the temperature resistance can reach 250 DEG C, the mineralization resistance degree can reach 200,000 mg / L, and good compatibility is obtained; the temperature-resistant and salt-resistant type anti-swelling clay stabilizer can be forcefully adsorbed to the surface of clay and is not easy to decompose, long in validity period and high in anti-swelling rate, and the anti-swelling rate can reach 98 percent or more.

The invention belongs to the technical field of oil field development, and specifically relates to a temperature-resistant and salt-resistant anti-swelling clay stabilizer and a preparation method thereof. The anti-swelling clay stabilizer is composed of soybean oil modified surfactant, amino carboxylic acid resin, Ammonium sulfate and water are compounded; wherein, the soybean oil modified surfactant is a quaternary ammonium salt surfactant with a long carbon chain alkyl group and a quaternary ammonium cation. The anti-swelling clay stabilizer of the present invention has the characteristics of wide source of raw materials, simple synthesis process, less dosage, and strong adaptability to oil reservoirs; meanwhile, it has good heat and salt resistance, can withstand temperatures up to 280°C, and can resist salinity up to 230,000mg / L, and has good compatibility with formation water, high anti-swelling rate, and the anti-swelling rate reaches more than 98.0%. Therefore, the present invention can be widely applied to the technical field of oil field exploitation.

The invention discloses a star type polycation based compound and a preparation method and applications thereof. The surfactant is prepared by the following steps: dropwise adding quantitative trihydroxymethyl propane-tri(3-aziridinylpropionate) reaction liquid into a reaction bottle filled with a water solution of methylamine or ethylamine and an acidic catalyst to carry out aziridine ring-opening reactions (first step); and then adding quantitative chloromethane or benzyl chloride into the reaction liquid to carry out quaternary amination reactions (second step). The reaction product is a star type polycation based compound.

The invention discloses a cationic surfactant carrying a dense charge and its preparation method and application. The surfactant is prepared through the following steps: adding quantitative The trimethylolpropane-three (3-aziridinyl propionate) reaction solution carries out the first step aziridine ring-opening reaction; then in the reaction solution, add quantitative 3-chloro-2-hydroxypropyl- Trimethylammonium chloride is subjected to the second step of quaternization reaction, and the resulting product is a cationic surfactant carrying a dense charge.

The invention belongs to the technical field of oil field development, and particularly relates to a long-acting oil well anti-swelling clay stabilizing agent and a synthetic method thereof. 2,3-naphthalic anhydride and n-dodecyl alcohol react to generate dodecyl ortho naphthalene dimethylbenzene anhydride half ester, the dodecyl ortho naphthalene dimethylbenzene anhydride half ester and 2-(dimethylamino) chloromethane hydrochloride generate an intermediate through solution polymerization reaction, the intermediate and 1-bromomethyl-naphthalene react to generate the clay stabilizing agent, themolar ratio of the 2,3-naphthalic anhydride, the n-dodecyl alcohol, the 2-(dimethylamino) chloromethane hydrochloride to the 1-bromomethyl-naphthalene is 1:(0.8-1.4):(1.2-1.6):(1.1-1.8), and preferably, the molar ratio is 1:1:1.4:1.2. The clay stabilizing agent has the advantages of wide raw material source, simple synthetic process, less consumption and high oil deposit adaptability. The clay stabilizing agent is good in temperature and salt resistance, can resist the temperature of 250 DEG C and resist the mineralization degree of 220000mg / L and has good compatibility. The clay stabilizingagent can be powerfully adsorbed onto the surface of clay, is not easily decomposed and is long in validity period and high in anti-swelling rate, and the anti-swelling rate reaches 98% or more.