39results about How to "Meet the requirements of degreasing pretreatment" patented technology

The invention belongs to the technical filed of oil field sewage treatment, and in particular relates to a high-temperature high-salt resistant thick oil thermal recovery sewage degreasing agent which is compounded from a dication surfactant, activated silica, sodium carboxymethylcellulose and water, wherein the dication surfactant is a symmetric molecule with long-carbon-chain alkyl and biquaternary ammonium salt cation polar groups. The degreasing agent provided by the invention has the characteristics of simple preparation process, low cost and good temperature and salt resistance, the mineralization resistance degree of the degreasing agent can be up to 250000mg/L, the temperature resistance of the degreasing agent is up to 250 DEG C, and a good degreasing effect can be achieved; the degreasing rate of thick oil thermal recovery sewage can be greater than 96%, and compared with that of a conventional agent, the degreasing rate of the degreasing agent is increased by more than 40%. Therefore, the degreasing agent can be widely applied to degreasing processes of thick oil thermal recovery sewage.

The invention belongs to the technical field of oil field sewage treatment, and particularly relates to a ternary polymer degreasing agent used for thickened oil thermal production sewage treatment. The degreasing agent is prepared by acrylamide, N-benzyl-N-ethylacrylamide and N-vinyl pyrrolidone through a free-radical micelle copolymerization method. The molecular weight of the degreasing agent is 10000-90000, and 30000-50000 preferably. The molar ratio of the acrylamide to the N-benzyl-N-ethylacrylamide to the N-vinyl pyrrolidone is 1:0.1-1.5:0.5-3, and 1:1.1:1.5 preferably. The degreasing agent disclosed by the invention is easy to prepare, high in temperature resistance and salt tolerance and low in cost, and the degreasing rate can reach 96% or above. Moreover, recovered oil generated in the separation process cannot influence subsequent crude oil dehydration. Therefore, the ternary polymer degreasing agent can be widely applied to degreasing technologies of oil field thickened oil thermal production sewage.

The invention belongs to the technical field of oil field sewage treatment, and particularly relates to an oil removal agent for thickened oil thermal recovery sewage. The oil removal agent is prepared from acrylamide, N-benzyl-N-ethyl acrylamide and acetic acid vinyl ester through a free-radical micelle copolymerization method, and is 6,000 to 50,000, preferably 20,000 to 30,000 in molecular weight, wherein the molar ratio of the acrylamide to the N-benzyl-N-ethyl acrylamide to the acetic acid vinyl ester is 1 to (0.5-3) to (0.1-2.5), preferably 1 to 1.5 to 2. The oil removal agent has the advantages of easiness in preparation, high temperature and salt resistance and low cost, and the oil removal rate can reach 96 percent or above; moreover, subsequent crude oil dehydration is not influenced by recycled oil generated by separation. Thus, the oil removal agent can be widely applied to an oil removal process of oil field thickened oil thermal recovery sewage.

The invention belongs to the technical field of oil field wastewater treatment, and particularly relates to a cationic type degreaser for polymer flooding produced water treatment. The degreaser is characterized in that n-capric aldehyde reacts with epoxy bromobutane under catalysis of a boron trifluoride diethyl etherate solution to generate a midbody, and then the midbody reacts with quinoline to generate the cationic type degreaser. The molar ratio of the n-capric aldehyde to the epoxy bromobutane to the quinoline is 1:(0.75-1.5):(0.6-1.2), the preferential molar ratio is 1:1.25:0.80. The degreaser has the beneficial effects of being simple in preparing process, low in cost, high in adaptability and good in degreasing effect, and the degreasing rate is higher than 97%. The cationic type degreaser can be widely applied to an oil field polymer flooding produced water degreasing process.

The invention belongs to the technical field of oil field wastewater treatment, and specifically relates to a degreasing agent of polymer flooding effluent and a preparation method thereof. The degreasing agent is prepared by reacting n-capric aldehyde with epoxy bromobutane under the catalysis of a boron trifluoride diethyl etherate solution to generate an intermediate, and then reacting with pyrrolidone to generate the cationic type degreasing agent. The molar ratio of n-capric aldehyde, epoxy bromobutane to pyrrolidone is 1.0: (0.5 to 1.25): (0.5 to 1.5), preferably 1.0: 1.0: 1.1. The degreasing agent disclosed by the invention has the characteristics of simple preparation technology, low cost, high adaptability and good degreasing effect, and the degreasing reaches up to more than 97%. Therefore, the degreasing agent can be widely applied to a degreasing technology of oil field polymer flooding effluent.

The invention specifically relates to an oil removing agent for produced water of binary combined flooding, belonging to the technical field of treatment of oil field wastewater. The oil removing agent is prepared from an imidazole-based surfactant, magnesium sulfite, acrylamide and water through compounding, wherein the imidazole-based surfactant is an imidazole inner salt with long-carbon-chain alkyl groups, hydroxyl groups and sulfonic groups. The oil removing agent provided by the invention has the advantages of simple preparation, strong salt resistance, low dosage, low cost and high oil removal rate, wherein the oil removing agent can resist salt with a concentration of 200000 mg/L and the oil removal rate reaches 95% or above; recovered oil produced after separation has no influence to subsequent dehydration of crude oil; and thus, the oil removal agent can be extensively applied to oil removing processes for produced water of binary combined flooding.

The invention belongs to the technical filed of oilfield sewage disposal, and particularly relates to a compound degreaser for polymer flooding produced water and a preparation method thereof. The compound degreaser is formed by compounding a Gemini surface active agent, sodium bicarbonate, sodium dodecyl sulfate and water, wherein the Gemini surface active agent is a symmetrical molecule which has long carbon chain alkyl and diphenyl sulfonate polar groups. The compound degreaser has the characteristics of simple preparing process, low cost, good salt resistant property, salinity tolerance being up to 250,000 mg/L and good oil removal effect. The oil removal rate of the polymer flooding produced water reaches up to 97% and is increased by 50% or more compared with existing chemicals. Therefore, the compound degreaser can be widely applied to the oil removal process of the polymer flooding produced water.

The invention belongs to the technical field of oil field sewage treatment and particularly relates to a deoiling agent for oily sewage and a preparation method thereof. The deoiling agent is a cationic type deoiling agent being prepared by performing a reaction to perfluorotriethylamine and 3-methylbromo-5-dodecylpyridine in an ethanol solution, wherein molar ratio of the perfluorotriethylamine to the 3-methylbromo-5-dodecylpyridine 1:0.8-1.4, preferably 1:1.0. The deoiling agent is simple in preparation process, low in cost and strong in adaptability and has good temperature resistance and good deoiling effect, wherein maximum temperature resistance reaches 250 DEG C and deoiling rate to the oily sewage reaches more than 97%, which is improved than that of medicines in the prior art by more than 50%. Recycled oil, which is generated by separation, has no influence on subsequent crude oil dehydration, so that the deoiling agent can be widely applied to oil removal treatment for oily sewage in oil field.