57results about How to "Strong oil washing ability" patented technology

The invention relates to a surfactant composition for chemical displacement of reservoir oil and a preparation method thereof, mainly for solving the problems that the conventional surfactant is poor in oil displacement efficiency in the tertiary oil recovery process and an oil displacement system containing inorganic base damages stratums and oil wells, corrodes equipment and pipelines and results in difficult demulsification. The surfactant composition provided by the invention comprises a cationic surfactant and an anionic-nonionic surfactant, wherein the cationic surfactant is at least one of quaternary ammonium salt and quaternary ammonium alkali; the anionic-nonionic surfactant is a surfactant containing an ethyoxyl nonionic group and a carboxyl or sulfonic acid group anionic group; and the molar ratio of the cationic surfactant to the anionic-nonionic surfactant is (1:0.01)-(1:100); and by the adoption of the surfactant composition and the preparation method of the surfactant composition, the above problems can be well solved. The surfactant composition can be applied to tertiary oil recovery process of an oil field.

The invention relates to an oil displacing composition containing a carboxyl betaine type surfactant and a preparation method and application thereof. The problems that in the prior art, macromolecular polymers in combination flooding are prone to causing reservoir blocking and difficult injection in medium-low-permeability oil reservoirs are mainly solved. The oil displacing composition containsthe betaine type ampholytic surfactant and inorganic salts, wherein the structure of the betaine type ampholytic surfactant is shown in the formula (I), R1 is selected from any one of C6-C29 alkyl andvinyl, R3 and R4 are selected from any one of C1-C12 alkylene and hydroxyl-substituted alkylene, and the inorganic salts are at least one of a halide, carbonate, bicarbonate, sulfate, sulfite and nitrate; the molar ratio of the betaine type ampholytic surfactant to the inorganic salts is 1: 0.01 to 1: 100. By means of the technical scheme, the technical problems are well solved, and the oil displacing composition can be used for oil displacing production of oil fields. Please see the specification for the formula (I).

The invention provides a foam flooding agent which comprises the following components in parts by weight: 30-60 parts of A polyalkylsodium benzenesulfonate, 5-15 parts of B surfactant, 0-15 parts of C tetrakis(hydroxymethyl)phosphonium sulfate, 5-10 parts of D tween-20 and 25-55 parts of E water. The invention has the following advantages: 1. the activity is high, so the oil-water interface surface tension can be lowered without adding alkali; 2. the foam flooding agent can resist high temperature and high salt, can not be decomposed at 220 DEG C, and can resist total ion concentration; and 3. compared with other existing foam flooding agents, the 50 DEG C half life period of foam is up to 400 minutes, the foam volume is 330mL, and the foam flooding agent has favorable compatibility with other surfactants and enhances the oil recovery rate by 15% in laboratory simulation.

The invention relates to a microbial oil displacement agent, the composition and weight of which are: coconut oil 50~80kg, starch 30~50kg, NaNO 3 6~8kg, K 2 HPO 4 2~2.5kg, KH 2 PO 4 1.5~2.5kg, NaCl 1~1.5kg, MgSO 4 0.3~0.5kg,K 2 SO 4 0.05-0.08 kg, Bacillus amyloliquefaciens bacteria liquid 10-40kg, lauryl alanine 80-100kg, deionized water 800-950kg. The invention also provides a preparation method of the microbial oil displacement agent. The microbial oil displacement agent of the present invention has strong oil washing ability, can effectively increase the oil recovery rate by 6-9%, has the characteristics of strong reliability, good use effect and high economic benefit as a whole, and is suitable for popularization and application in oil fields in a wide range.

The invention relates to a surfactant combination for enhancing oil recovery and a preparation method thereof, and mainly solves the problem of low oil displacement efficiency in the tertiary recovery process in the existing surfactants and the problem of damage to stratums and oil wells, corrosion of equipment and pipes and difficulty in demulsification because inorganic base is contained in oil displacement systems. The surfactant combination comprises a cationic surfactant and an anionic-nonionic surfactant, wherein the cationic surfactant is selected from any one of quaternary ammonium salt and quaternary ammonium alkali; the anionic-nonionic surfactant is a surfactant containing ethoxy nonionic groups and carboxyl or sulfo anionic groups; the mol ratio of the cationic surfactant to the anionic-nonionic surfactant is (1:0.01) to (1:100). The surfactant combination and the preparation method thereof preferably solve the problems, and can be applied to the tertiary recovery process of oil fields.

The invention relates to an alkali-free viscoelastic surfactant composition containing polyether carboxylate and a preparation method and application of the alkali-free viscoelastic surfactant composition. The problems that the surfactant used as an oil displacement agent has poor oil displacement effect in the high temperature and the low permeability reservoir, and meanwhile, great damage is brought to the stratum and oil wells due to the fact that alkali is contained in current production technologies are mainly solved. As for the alkali-free viscoelastic surfactant composition containing the polyether carboxylate, according to the technical scheme, the alkali-free viscoelastic surfactant composition containing the polyether carboxylate comprises an ampholytic surfactant shown in a formula (I) and organic acid salt shown in a formula (II) (please see the specifications for the formula (I) and the formula (II)), wherein R1 is selected from any of alkyl and alkenyl of C6-C29, and R2 and R5 are independently selected from any of alkylene and hydroxyl substituted alkylene of C1-C22 correspondingly; and the molar ratio of the ampholytic surfactant to the organic acid salt is 1 to 0.01-1 to100, the technical problem is well solved, and the alkali-free viscoelastic surfactant composition containing the polyether carboxylate can be applied to oil displacement production in an oilfield.

The invention relates to a surfactant composition and a preparation method thereof, which mainly solve the problems that the oil displacement efficiency of the existing surfactant is low in the tertiary oil recovery process and damage to strata and oil wells, corrosion to equipment and pipelines and difficulty in demulsification occur because an oil displacement system contains inorganic alkali. According to the technical scheme of the invention, the surfactant composition comprises cationic surfactant and anionic-nonionic surfactant, wherein the cationic surfactant is at least one selected from quaternary ammonium salt or quaternary amine alkali, the anionic-nonionic surfactant is at least one selected from alkanolamide polyoxy ethylene / propylene ether carboxylate or alkanolamide polyoxy ethylene / propylene ether sulfonate, and the mol ratio of the cationic surfactant to the anionic-nonionic surfactant is (1:0.01)-(1:100). The invention also provides a preparation method of the surfactant composition. Thus, the problems are well solved; and the invention can be used for the forced oil recovery process of oil fields.

The invention relates to a preparation method and an application of alkali-free viscoelastic surfactant composition and mainly solves the problem of poor flooding effect of an existing flooding systemunder the condition of the high-temperature and low-permeability reservoir. According to the technical scheme, the alkali-free viscoelastic surfactant composition is prepared from a betaine surfactant, an anionic surfactant and water, wherein the betaine surfactant is represented as the formula (I) in the description; the anionic surfactant is selected from at least one of structures shown as theformula (II) in the description; in the formula (I), R1 is selected from any one of C8-C29 alkyl and alkenyl, and R2 and R3 are independently selected from C1-C5 alkylidene and hydroxyl substituted alkylidene; in the structural formula (II), X is selected from at least one of carboxylate radical and sulfonate radical. With the adoption of the technical scheme that the mole ratio of an ampholyticsurfactant to the anionic surfactant is 1:0.01-1:100, the technical problem is solved better, and the alkali-free viscoelastic surfactant composition can be applied to tertiary oil recovery of an oilfield.