44results about How to "Avoid secondary precipitation" patented technology

The invention relates to an offshore oilfield water injection well online one-step-process acidification technology, which comprises following steps of (1) preparing one-step acid liquor, wherein the one-step acid liquor consists of following components by weight percent: 20 to 40 percent of industrial acetic acid, 15 to 40 percent of industrial hydrochloric acid, 3 to 15 percent of deposition inhibitor, 5 to 15 percent of discharging aiding agent, 3 to 15 percent of corrosion inhibitor, 5 to 15 percent of antiswelling agent, 5 to 15 percent of iron ion stabilizer and 2 to 10 percent of hydrogen fluoride; (2) storing the acid liquor into an acid storage tank of an injection system, wherein the injection system consists of the acid storage tank, an acid resistant pump, a motor, a frequency converter, a flow sensor, a pressure sensor, a computer, a check valve, a three-way pipe and an acid injection pipe; (3) utilizing the acid resistant pump to pump the acid liquor into the water injection flow; (4) monitoring the variation of the pressure and the flow of the injected acid, and calculating skin coefficients in real time; and (5) keeping the water injection after stopping the acid injection. Due to the adoption of the offshore oilfield water injection well online one-step-process acidification technology, high efficiency, rapidness and large scale in plug removal of an offshore oilfield water injection well can be realized, the water injection pressure can be reduced, and the water injection quantity can be improved.

The invention provides a neutral plug removal treating agent and a preparation method thereof. The neutral plug removal treating agent comprises the following components in percent by mass: 5 to 12 percent of an antiscaling agent, 0.5 to 1 percent of a synergist, 0.5 to 2 percent of a dispersing agent, 0.5 to 2 percent of a regulator, 5 to 10 percent of a cosolvent, and the balance of water. The neutral plug removal treating agent has the advantages that acidic materials are not added or produced during the whole process, wax, colloid and asphaltene covering the surface of sediments can be removed under a neutral low-temperature condition, and the neutral plug removal treating agent is neutral, non irritant, low-corrosion, low in transportation risk, and mild in plug removal reaction, effectively removes indissolvable inorganic scales, such as sulfate and carbonate, and achieves the purposes of elimination of transportation operation risk, reducing of tubular column corrosion rate, protection of a reservoir framework structure and improvement of the success rate of measures.

The invention discloses bio-enzyme well completion fluid. The well completion fluid is prepared from 1-10 parts of bio-enzyme parathion and 90-99 parts of water, or bioacid, acetic acid or metal-chelator are added to prepare the well completion fluid which is injected into an oil-gas well through a pump truck. The well completion fluid is absorbed at the surface layer of the drill core, can help to avoid reservoir pollution and corrosion to the downhole tools during the drilling operation, removes organic scales and inorganic sediment, thoroughly degrades the polymer, disperses the filter cakes, can permeate into the micro pore-throat, improves the water wetting effect, eliminates water lock damage, reduces the oil-water surface interface tension, improves the oil-gas permeability, and enables the oil-gas well to have the optimal production state and to achieve good economic benefit.

The invention provides a test method for chelating capability of chelating acid to metallic iron ions. The test method comprises the steps of taking chelating acid solution, titrating through EDTA standard solution to a destination in the presence of ammonium ferric sulfate dodecahydrate, then calculating out the chelating capability of the chelating acid to the iron ions according to a formula (1) and expressing through amount of chelating iron ions in a sample. In the formula, omega (Fe) is iron ion chelating capability mg / g, V1 is the volume mL of consumed EDTA standard solution, V2 is the volume mL of blank experiment consumed EDTA standard solution, C2 is the concentration mol / L of the EDTA standard solution, m2 is the weight g of the sample, V3 is the volume mL calibrated by a 500mL volumetric flask, and V4 is the volume mL calibrated by a 5mL transfer pipette. The test method disclosed by the invention is simple and quick to operate, has good repeatability and is easy to popularize and apply.

The invention discloses salt and blockage remover which consists of a high-efficiency compound complexing agent, a high-efficiency penetrating agent, an inhibitor, a mutual solvent, a multi-componenthigh-efficiency corrosion inhibitor and other components. The salt and blockage remover is a non-toxic and harmless pure organic green and environmentally-friendly product, has a strong inorganic scale corrosion ability and can interact with silicoaluminate aiming at inorganic material blockage in an oil-gas well and a water injection well to form soluble chelates and play a role in dissolving clay-like minerals; the salt and blockage remover can form a stable water soluble matter with Ca<2+>, Mg2<2+> and other ions to remove the blockage caused by inorganic scales; the salt and blockage remover can form a stable complexing system with iron ions to prevent secondary precipitation; the salt and blockage remover can interact with the clay-like minerals, inhibit the clay swelling migration and dissolve calcium sulfate, barium sulfate, strontium sulfate and other scales incapable of being dissolved by a strong acid system, thereby comprehensively removing the inorganic matter blockage andachieving the purpose of salt and blockage removal.

The invention discloses a deep-penetration chelated environmentally-friendly online plug removal system, which comprises the following raw materials by weight: 2-5% of a matrix chain breaking agent, 10-30% of a solid chelating acid, 5-20% of a clay stabilizer, 10-20% of a synergist, 3-10% of a corrosion inhibitor, and the balance of water. Compared with the conventional acid liquor, the system ofthe present invention slowly reacts with acid rock, wherein the acid rock reaction rate is only about one tenth of the acid rock reaction rate of hydrochloric acid. According to the present invention,the system has strong chelating ability to metal ions such as iron ions, calcium ions and the like, such that the metal ions can be prevented from being precipitated in residual acid so as to avoid secondary damage to reservoir.

The invention relates to a cross-linking agent for carboxymethyl guar gum acidic fracturing fluid and a preparation method thereof. At present, water-based fracturing fluid is preferably selected for the fracturing of most of reservoir beds at home and abroad, so that the fracturing reconstruction effect is greatly influenced, particularly the reservoir bed is greatly damaged by an alkali-sensitive stratum. The cross-linking agent consists of 132 parts of aluminum chloride, 100-200 parts of ethylene glycol, 50-70 parts of triethanolamine, 200-300 parts of acetic acid and 10 parts of corrosion inhibitor. The preparation method comprises the following steps of: adding the ethylene glycol in a closed container with a stirrer; starting the stirrer; slowly adding the aluminum oxide; then stirring for 30-60 minutes; heating to 80-100 DEG C; adding the triethanolamine; keeping the temperature to react for 3 hours; then cooling to 50-70 DEG C; adding organic acid; keeping the temperature to react for 1-1.5 hours; and then adding the corrosion inhibitor to react for 30 minutes to form brownish yellow homogeneous phase fluid. The fracturing fluid formed by the cross-linking agent and a thickening agent is of an anionic system, so that an additive is prevented from being adsorbed to the stratum; and thus, the wettability of rock is changed, and the implementation of the performance of the additive in the stratum is realized.

The invention relates to a fruit vinegar filter system, characterized by comprising a fruit vinegar supply tank, a first pipeline, a tetrafluoroethylene film filter device, a first pressure pump, a first filter tank, a second pipeline, a nano-film filter device, a second pressure pump, a second filter tank, a third pipeline, a reverse osmosis film filter device, a third pressure pump, a third filter tank, a washing device connected with the tetrafluoroethylene film filter device, the nano-film filter device and the reverse osmosis film filter device, and a controller electrically connected with electromagnetic valves on the pipelines, the pressure pumps and the ashing device. The filter system can remove high molecular weight proteins, gelatins, fibers, microorganisms and the like from a fruit vinegar at a time, secondary precipitation occurring under the influence of time, temperature, light and the like is avoided, the technical requirement is met by single filtering, a production cycle is shortened, the filter system can be automatically washed regularly under control of the controller, regeneration and recovery are convenient, and the service life is long.

A method for detecting bioavailable lead in soil comprises the following steps: s100, collecting and pretreating a sample, to be more specific, collecting the soil, air-drying the collected soil at room temperature, grinding, sieving by a 200-mesh sieve to prepare the soil sample, weighing 1-5 g of the soil sample, and putting the soil sample into a 250 ml polytetrafluoroethylene centrifugal cup,respectively adding 25 ml of a 1 mol / L strontium chloride solution and 25 ml of a 0.5mol / L glucose solution, stirring by a constant-temperature magnetic stirrer, centrifuging by a centrifugal machine,taking supernate, filtering the supernate with a filtering membrane to obtain an extracting solution, and diluting the extracting solution to a scale by using a HNO3 solution with the concentration of 1%; s200, determining the concentration of the bioavailable lead in the extracting solution, to be more specific, establishing a standard curve used for determining the different concentrations of the bioavailable lead by adopting an atomic absorption spectrometer through a flame atomic absorption method, and measuring the concentration of the bioavailable lead in the extracting solution throughthe standard curve by adopting the atomic absorption spectrometer; and s300, analyzing results, to be more specific, according to the measured mass of the soil sample and the measured concentration of the extracting solution, calculating the content of the bioavailable lead in the measured soil sample.

The invention discloses a detergent as well as a preparation method and an application thereof. The detergent comprises the following components in percentage by weight: 90-99.6% of fatty acid methyl ester, 0.2-4% of polycarboxylic acid and 0.2-6% of polyoxyethylene ether. The preparation method comprises the step: uniformly stirring and mixing fatty acid methyl ester, polycarboxylic acid and polyoxyethylene ether to obtain the detergent. The detergent disclosed by the invention is used for cleaning heavy oil dirt and deposited carbon in compressors or industrial pipelines. The detergent disclosed by the invention is strong in detergency, fast in deposited carbon removal speed and free from equipment corrosion, and has the effect of environment friendliness, safety and resource saving.

The invention provides a screening method for benign lactobacillus strain capable of reducing the secondary precipitation of soybean sauce. The method includes the following steps: S1, performing amplification culture on different sets of lactobacilli, performing microscopic examination on a nutrient solution, and preliminarily screening strains with 3-8 cells connected together; S2, performing salt tolerance analysis test on the lactobacillus strains preliminarily screened in the S1, and secondarily screening the lactobacilli suitable for high salt soy sauce brewing process; and S3, adding the lactobacilli through secondary screening in the S2 into soy sauce mash to perform fermentation, detecting histamine and tyramine content in supernatant after the fermentation is completed, selectingthe lactobacilli whose histamine and tyramine content are lower than 25 mg / L, which are the required lactobacillus strains. A soybean sauce preparation technology applying the screened benign lactobacillus strains is simultaneously provided. The benign lactobacilli can be obtained through strain forms, salt tolerance test and soy sauce mash fermentation and screening and added at a soy sauce mashpreparation phase, so that the secondary precipitation of soybean sauce can be reduced, and the flavor of the soybean sauce can be improved.

A process for eliminating the secondary deposit of concentrated apple juice includes such steps as squeezing apple to obtain fresh apple juice, sufficient browning for 0.5-1.5 gelatinizing, adding pectiase or amylase, enzymolyzing, adding activated carbon particles, adsorbing for 6-8 hr, ultrafiltering, and concentrating.

The invention belongs to the technical field of crude oil paraffin inhibitors, and discloses an oil pipe paraffin inhibitor and a preparation method and application thereof.The preparation method comprises the steps that graphene oxide powder is evenly dispersed in a water solvent under the ultrasonic action to obtain graphene oxide turbid liquid; then, uniformly dispersing a binary polymer monomer and a silane coupling agent into the graphene oxide turbid liquid through primary stirring treatment, and dropwise adding an initiator for suspension polymerization, so that the binary polymer monomer is polymerized on the surface of graphene oxide to obtain a binary polymer-graphene oxide compound; and then adding the descaling agent, stirring for the second time, and uniformly mixing, so as to obtain the paraffin-control descaling agent for the oil pipe. The oil pipe paraffin and scale inhibitor is good in paraffin and scale inhibition effect, the preparation method is simple and easy to operate, the preparation raw materials are low in cost, and the preparation method is green and environmentally friendly.

The invention discloses sewage treatment equipment capable of simultaneously scraping skim and stirring. The sewage treatment equipment structurally comprises a sewage treatment tank, a sewage inlet pipe, a purified water outlet pipe, an electrical control box, an additive storage barrel, a chemical adding pump, a chemical adding pipe, a simultaneous skim-scraping and stirring device and a skim-discharging hopper, wherein the sewage treatment tank adopts a rectangular structure; the sewage inlet pipe is arranged on the left side of the sewage treatment tank and is vertically connected with thesewage treatment tank in a run-through way in an electrowelding manner; the purified water outlet pipe is arranged on the right side of the sewage treatment tank and is vertically connected with thesewage treatment tank in a run-through way in an electrowelding manner; the electrical control box is arranged on the left side of the sewage treatment tank and is electrically connected with the chemical adding pump and the simultaneous skim-scraping and stirring device. Through arrangement of the simultaneous skim-scraping and stirring device, the sewage treatment equipment can simultaneously scrape the skim from sewage and stir the sewage to scrape off and discharge the skim floating while stirring so as to prevent secondary sedimentation of the skim, so that the skim-scraping effect is effectively improved, the purifying treatment effect of the sewage treatment equipment is enhanced, the quality of effluent water is improved, and the environment is protected.

The invention discloses a Lithospermum erythrorhizon-based plant dyeing method and an apparatus thereof. The method comprises the following steps: curing, separating and locking a pigment in Lithospermum erythrorhizon by using starch and cellulose, adopting sodium alginate and chitosan as a biological thickener to improve the viscosity of the solution in order to form a macro-molecular hydrophilic group and further peel pigment molecules, and extracting the pigments through a centrifuging machine by using ethanol as an extracting agent in order to form a dye solution. The process is environmentally friendly, and has no pollution, and the dyeing process is realized by a dyeing tank. The method and the apparatus greatly improve the dyeing efficiency, the pigment extraction performance and the color fastness of a dyed cloth.

The invention belongs to the technical field of in-situ leaching uranium mining, in particular to an in-situ leaching uranium mining drilling hole blockage removal and permeation enhancement technology, and aims to finally achieve the effects of uranium deposit blockage removal and permeation enhancement by a series of technological operations such as adding an activating agent, a comprehensive blockage removal agent and an anti-expansion displacing agent to a blocked ore bed, and parameter control, so as to well solve the problem of near-wellbore zone and ore bed blockage in a neutral leaching technology. The technology is characterized by comprising the steps of reagent preparation, surfactant injection, comprehensive blockage removal agent injection, anti-expansion displacing agent injection, standing and air compressor hole washing. When the technology is adopted in the specific Xinjiang uranium deposit well flushing process, the problem of ore deposit blockage is effectively solved, and the water amount after hole flushing is larger than the normal water level by 2-3m<3> / h, the maintenance time reaches 130d or more, the stratum can be prevented from being damaged for the second time, and the technology is simple and feasible in technique and economy and is a preferred hole washing technology for uranium deposit blockage removal and permeation enhancement.

The invention provides an anti-scour reinforcing agent for low-permeability coal seam water injection. In the reinforcing agent, a chelation type surface active agent N-acyl ED3A and a non-polar electrolyte are selected as a reinforcing agent composite additive. The N-acyl ED3A can act with mineral substances glued into a coal body, an adhesive is transformed into a soluble state from an insolublestate, and a very stable chelate complex is formed; the inner diameter of pores in the coal is increased, and the fluidity of water in the pores is improved; the N-acyl ED3A has the advantages of a surface active agent, the surface tension is reduced, and the wettability of the coal is improved.

The invention relates to acid mixed solution, in particular to a chelating acid of sandstone for the yield increase of oil-gas fields. The technical scheme is that: the chelating acid is prepared from citric acid, citrate, ammonium salt, ethylene diamine tetraacetic acid and surfactant in a ratio of (1-25):(1-20):(1-20):(0.01-1):(0.01-1). The chelating acid has the advantages that: the pH of a chelating acid system is more than 5, so that the chelating acid has small corrosion to metal pipelines and drilling equipment; the chelating acid has high dissolution to the sandstone, and the dissolution rate of the sandstone is more than 10 percent; the chelating acid also can effectively avoid the generation of secondary sedimentation; and the acid has excellent sustained-release effect, and can enter a deep stratum to work.

The invention discloses a three-step annealing process for aluminum-free ultra-high carbon steel. The component and content expression of the ultra-high carbon steel is Fe-1.58C-1.97Cr-0.26Si-0.73Mn-0.09Mo. The whole process of a heat treatment process is implemented under an air environment condition, and comprises the following steps: first performing austenitizing isothermal treatment on materials at 840 to 880 DEG C; then cooling the materials to 750 to 790 DEG C at the cooling speed of 3 to 8 DEG C per second; finally performing isothermal treatment at 750 to 790 DEG C, and performing furnace cooling to room temperature after the isothermal treatment. According to the three-step annealing process, by a heat treatment annealing process comprising three associated and combined steps, the effective dissolution of carbide is ensured, the re-precipitation of massive or reticular carbide after the ultra-high carbon steel is completely austenitized is prevented, the materials can form a structure consisting of pearlites and fine and uniformly-distributed granular carbide, and the toughness of the materials is improved.

The invention provides a method for testing the chelating ability of a chelating acid to metal calcium ions. The method comprises the following steps: taking a chelating acid solution, titrating the chelating acid solution by using a calcium acetate standard solution in the presence of a buffer solution until an end point is reached, calculating the chelating ability of the chelating acid to the calcium ions according to formula (1), and representing the chelating ability by the amount of the sample chelated calcium ions: omega(Ca) = (C1*V1*M) / (m1 / V2*V3), wherein omega(Ca) representing the calcium ion chelating ability, mg / g; C1 representing the concentration of the calcium acetate solution, mol / L; V1 representing the consumption volume of the calcium acetate solution, mL; M representing the molar mass of calcium, g / mol; m1 representing the mass of the sample, g; V2 representing an accurate volume value after 500 mL volumetric flask calibration, mL; and V3 representing an accurate volume value after 100 mL pipet calibration, mL. The determination method has the advantages of simplicity and rapidness in operation, and easiness in promotion and use.

The invention discloses a blocking remover system and a blocking removal method, and relates to the technical field of oil and gas production. The blocking remover system comprises a pre-acid and a main body acid, wherein the pre-acid comprises the following components in percentage by weight: 8-12% of hydrochloric acid, 0.2-0.6% of a first clay stabilizer, 0.5-1% of a first corrosion inhibitor, 0.5-1% of a first iron ion stabilizer, 1-2% of a first water block removing agent, 0.1-0.6% of a first strong oxidant and the balance of water; the main body acid comprises the following components in percentage by weight: 8%-12% of hydrochloric acid, 1%-3% of hydrofluoric acid or fluoboric acid, 0.5%-1% of a second corrosion inhibitor, 0.5%-1% of a second iron ion stabilizer, 1%-2% of a second water lock removing agent, 0.2%-0.6% of a second clay stabilizer, 0.1%-0.6% of a second strong oxidant and the balance of water. The blocking remover system achieves the purpose of removing composite blocking of well entering fluid blocking and muddy blocking.

The invention discloses a plant dyeing method and device based on dioscorea cirrhosa. Starch and cellulose are adopted to fix, separate, and lock pigments in dioscorea cirrhosa. Sodium alginate and chitosan are taken as a biological thickening agent to increase the solution viscosity to form macromolecular hydrophilic groups so as to further peel the pigment molecules; finally ethanol is taken as an extracting agent to extract pigments by a centrifuge so as to form a liquid dye, the process is environmentally friendly and pollution-free, and the dyeing process is achieved in a dyeing tank. The dyeing method and device have the advantages that the dyeing efficiency, the pigment extraction performance, and the color fastness of dyed cloth are greatly improved.

The invention belongs to the technical field of food additive production, and relates to a method for pretreating a hibiscus sabdariffa linn pigment extracting solution before on-column adsorption and purification. The method is characterized by comprising the steps of adding water into dried hibiscus sabdariffa linn calyxes, and soaking for extracting pigment, wherein a solid-liquid ratio is equal to 1: (5 to 20), the extraction temperature is 15-60 DEG C, the pH value is a natural pH value, pectinase is added or not added, and immersing extraction is carried out for 0.3-6h; filtering or centrifuging the obtained extracting solution; then, filtering by using a quartz sand filter, and enabling the filter to be in series connection with a resin adsorption column ,so as to enable filtrate, flowing out of the filter, to directly enter the macroporous resin adsorption column for purifying. The method has the characteristics that quartz sand filtering operation and resin adsorbing operation are carried out synchronously, so that the time consumed by the extracting solution, which flows out of the quartz sand filter and enters the adsorption column for adsorbing, is very short, and a macromolecular substance in the solution does not block the adsorption column due to having no time to accumulate and precipitate on the absorption column. If the pectinase is added in the extraction process, most of pectin can be removed from the source by means of hydrolysis, so that the backwashing frequency of the filter is reduced; however, the production cost is increased due to the addition of the pectinase.

The invention discloses a stepwise dissolution and plugging removal method for oil and water wells: (1) injecting pretreatment liquid; injecting cleaning agent; (2) injecting into the main body dissolution system to dissolve different cuttings components in the deep part of the oil and water well; plugging removal radius Above 3.5m; the main corrosion system is selected from the following acid solution plugging removal systems: ①hydrochloric acid system with an acidity of 8% to 12%; ②earth acid system with an acidity of 11% to 16%; ③acidity of 12% to 14% slow acid system; ④ deep penetrating plugging removal acid system with an acidity of 8% to 10%; the injection method of the main corrosion system is gradual injection without flowback; the injection sequence is determined according to the cuttings content; ( 3) Inject protective fluid, no flowback, and the construction is over. The method of the present invention adopts different blocking-removing acid solutions for graded dissolution for different cuttings, which can effectively improve the pore-throat connectivity of the reservoir, improve the water absorption profile of the reservoir and expand the sweeping range of water flooding, and can realize low-porosity and low-permeability storage effective use of layers.

The invention provides a loose sandstone reservoir permeability-enhancing sand-stabilizing acidification composite working solution and a preparation method and application thereof. The loose sandstone reservoir permeability-enhancing sand-stabilizing acidification composite working solution is composed of hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid, boric acid, a reservoir protection additive and water. The compound working fluid can be used for deeply and slowly acidizing to increase the permeability of a loose sandstone reservoir and improve the productivity of an oil-water well; fluorosilicic acid is adopted as a main acid, can react with albite, potassium feldspar, kaolinite and montmorillonite in a reservoir stratum under the combined action of hydrochloric acid and acetic acid, and basically does not react with a silicon dioxide skeleton in quartz, and boric acid is adopted to absorb fluosilicic acid and fluoboric acid to generate hydrofluoric acid, so that a sandstone skeleton is protected and prevented from being damaged by acidification, and thus sand production blockage is aggravated; boric acid and fluoboric acid synergistically repair and loosen the sandstone reservoir; and secondary precipitation of fluosilicate except calcium fluoride is prevented under the combined action of boric acid, hydrochloric acid and acetic acid.