31results about How to "Reduce safety and environmental risks" patented technology

The invention discloses a water-based drilling soft solid waste recycling treatment and utilization technology. The water-based drilling soft solid waste recycling treatment and utilization technologycomprises the steps that drilling soft solid waste is mixed evenly, a microorganism strain with a decomposing effect is inoculated at the proportion of 0.5%-1% by weight, and even mixing is carried out; then, a microorganism nutrient of 0.5%-2% of the solid waste by weight is added and mixed evenly, and the mixture is evenly mixed with soil with the water content of 15%-20%, wherein the mixing proportion of the solid waste and the soil is 1:(0.5-3) by weight; and the treated mixture is stacked, plants are planted or grass seeds are cast in the mixture, and a microorganism-soil-plant united system is used for decomposing treatment of organic pollutants in the drilling soft solid waste. By means of the water-based drilling soft solid waste recycling treatment and utilization technology, COD, Oil and other substances in the drilling work soft solid waste can be effectively decomposed and removed, part of the organic pollutants are decomposed into simple inorganic substances, and part ofthe organic pollutants are decomposed into humus, so that pollutants in the solid waste are removed, and the purposes of harmlessness and recycling utilization of the solid waste are achieved.

The invention discloses a water-based drilling fluid system solid waste recycle disposal and utilization process. The water-based drilling fluid system solid waste recycle disposal and utilization process includes: mixing polymer drilling fluid system drilling solid wastes uniformly, inoculating microorganism strains having degradation function according to a weight ratio of 0.1%-0.3% and uniformly mixing the microorganism stains with the polymer drilling fluid system drilling solid wastes, and then uniformly mixing the polymer drilling fluid system drilling solid wastes doped with the microorganism stains with soil containing 15%-20% of water, setting a mixing weight ratio of the drilling solid wastes and the soil as 1:0.2-0.5, stacking mixtures to be disposed, and using a microorganism-soil joint system for performing degradation disposal on organic polymers in the drilling solid wastes. The water-based drilling fluid system solid waste recycle disposal and utilization process achieves bioremediation disposal for the drilling solid wastes, obtains disposal materials which can be used as soil for completion well field second ploughing, achieves recycle disposal and utilization, and then achieves disposal recycling for different categories of the drilling water-based solid wastes.

The invention provides a huff-and-puff oil production device with a submersible directly-driven screw pump. The huff-and-puff oil production device comprises an underground automatic water injection switch for realizing water injection and oil production channel switching and a submersible directly-driven screw pump, wherein a liquid outlet in the upper end of the underground automatic water injection switch is connected with an oil pipe, and a liquid inlet in the lower end of the underground automatic water injection switch is connected with an oil outlet in the upper end of the submersible directly-driven screw pump through the oil pipe; the submersible directly-driven screw pump comprises a screw pump, a flexible shaft, an upper protect tor, a lower protector, a submersible motor and a centralizer which are non-coaxially connected from top to bottom; the upper end of the screw pump is connected with the lower end of the underground automatic water injection switch; and the screw pump and the submersible motor are respectively electrically connected to a submersible cable outside a wellhead. The huff-and-puff oil production device is free of repeatedly tripping and has the characteristics of simple and convenient operation flow, high construction efficiency, safety, environment friendliness, low risk and the like; and due to the adoption of the lifting way, the huff-and-puff oil production device has the characteristics of low rotating speed and large torque and is suitable for a well with low liquid quantity, the eccentric wear of pipe poles is eliminated, the maintenance-free period of an oil well is prolonged, and the economic benefit can be effectively increased.

The invention discloses a solid solution transition close potential stainless steel bead welding method for a pre-repairing of a steel pipeline welded junction. The method is used for bead welding of stainless steel on the inner wall at the end of a low carbon steel pipe, in particular to the solid solution transition close potential stainless steel bead welding method for pre-repairing of the steel pipeline welded junction. The method differs from other stainless steel bead welding methods for steel pipeline welded junction pre-repairing and is the solid solution transition close potential stainless steel bead welding method with the premise that good welding performance and inner corrosion prevention performance of the steel pipeline welded junction are guaranteed and corrosion of a bead welding bimetallic cell on the inner wall of the steel pipeline welded junction is prevented. The method is the key technology guaranteeing continuousness of a corrosion prevention layer of the inner wall of a steel pipeline and belongs to one of the main contents of the steel pipeline DGR integrated corrosion prevention technology.

The invention belongs to the technical field of tools for the oil and gas field and particularly provides a sand-out returning fluid stop valve for an oil well and an application method of the stop valve. The stop valve comprises an upper connector, a baffle, a pressure balance spring, a stop valve body, a setting ball, a ball seat, an upper oil pipe male buckle and a lower oil pipe female buckle.The problems are solved that in the prior art, during sand-out of the oil well, in the process of replacing a joint, there is still full of water in the well field, the requirement of the environmental protection act cannot be met, in the reverse-circulation sand-out process, the flow direction of pumped fluid is identical to that of returning fluid during sand-out and joint replacement, a checkvalve cannot be installed on an in-well pipe column, if the project is complex in the sand-out process, forward sand-out and reverse sand-out are needed, and installation of the check valve cannot meet the construction demand. According to the stop valve, overflowing of the returning fluid in the sand-out operation joint replacement process can be effectively blocked, the environmental pollution is avoided, site construction is effectively guided, the sand-out operation efficiency of a common oil pipe is improved, and the safety and environment protection risks are reduced.

The invention discloses a probenazole production process, comprising the steps of: carrying out a condensation reaction on lactic acid and o-phenylenediamine in hydrochloric acid water solution; regulating pH to obtain 2-alpha-hydroxyethyl benzimidazole; putting into a container using acetone and sulfuric acid as solvents for oxidization with potassium permanganate; extracting, desolventizing anddrying to obtain 2- acetyl benzimidazole; putting into a container using glacial acetic acid as a solvent to be brominated with bromne; drying a filtering cake to make 2- Dibromo-acetyl benzimidazolehydrobromide; finally cyclize with formamide and phosphorus pentasulfide in a container using ethyl acetate as a solvent; purifying; and regulating the pH to obtain probenazole, the content of which is larger than or equal to 99%. The production process reduces the cost and risks of safety environmental protection, reduces environmental pollution, enhances production efficiency, enables the wholereaction process to execute at normal temperature and pressure, and has mild reaction condition and stable reaction yield of each step. The total yield counted by the o-phenylenediamine is above 75%.

The invention relates to non-discharge plug-removing stick-releasing integrated working fluid and process for a ternary compound combination flooding oil well. The problems that in an existing process, the utilization rate of medicaments is low, the overall cost is high, the construction time is long, and reaction residual liquid needs to be discharged are mainly solved. The non-discharge plug-removing stick-releasing integrated working fluid is characterized by being prepared from a scale clearing agent and a protective agent, and the scale clearing agent is prepared from the components in percentage by weight: 5%-7% of hydrochloric acid, 3%-5% of solid nitric acid, 0.3%-0.5% of alkylphenol ethoxylates, 1.0%-2.0% of triethanolamine, 0.5%-1.0% of imidazoline-ammonium-salt corrosion inhibitor and 90.2%-84.5% of water; the protective agent is prepared from the components in percentage by weight: 3.0%-5.0% of sodium hydroxide, 0.5%-1.0% of ethylenediaminetetraacetic acid disodium salt, 0.5%-1.0% of nonionic demulsifier SP169 and 96.0%-93.0% of water. The invention further provides a non-discharge plug-removing stick-releasing integrated process for the ternary compound combination flooding oil well. The non-discharge plug-removing stick-releasing integrated working fluid and process have the advantages of high efficiency of scale clearing and plug removing, low cost, safety and environmental protection.

The invention provides an open high-oxygen circulating cooling water corrosion inhibitor and its preparation method and application. The corrosion inhibitor components include: 5-10% imidazoline monosaccharide acid solution, 1-3% zinc citrate, 5-8% sodium borate, 2-4% polyaspartic acid, 1-2% sodium tungstate, 4-7% sodium molybdate, 1-5% zinc acetate, 2-3% ethylenediamine tetramethylene base phosphoric acid, 1-2% pentasodium diethylenetriaminepentamethylene phosphonate and 2-4% hydroxyphosphonoacetic acid, and the balance is water; Ethylenediamine is used as a raw material, and hydroxyethylethylenediamine is first epoxidized, and then synthesized by acylation and cyclization. The corrosion inhibitor for open-type high-oxygen circulating cooling water has a good anti-corrosion effect on pipelines and equipment in high-oxygen open-type circulating cooling water systems. The addition amount is 0.5% and the temperature does not exceed 80°C. The corrosion inhibition efficiency is ≥ 95%, corrosion rate ≤ 0.05mm / a, physical properties meet the requirements of the standard Q / SYTZ0178-2012 "Technical Requirements and Test Methods for Sewage Corrosion Inhibitors".

The invention relates to non-discharge plug-removing stick-releasing integrated working fluid and process for a ternary compound combination flooding oil well. The problems that in an existing process, the utilization rate of medicaments is low, the overall cost is high, the construction time is long, and reaction residual liquid needs to be discharged are mainly solved. The non-discharge plug-removing stick-releasing integrated working fluid is characterized by being prepared from a scale clearing agent and a protective agent, and the scale clearing agent is prepared from the components in percentage by weight: 5%-7% of hydrochloric acid, 3%-5% of solid nitric acid, 0.3%-0.5% of alkylphenol ethoxylates, 1.0%-2.0% of triethanolamine, 0.5%-1.0% of imidazoline-ammonium-salt corrosion inhibitor and 90.2%-84.5% of water; the protective agent is prepared from the components in percentage by weight: 3.0%-5.0% of sodium hydroxide, 0.5%-1.0% of ethylenediaminetetraacetic acid disodium salt, 0.5%-1.0% of nonionic demulsifier SP169 and 96.0%-93.0% of water. The invention further provides a non-discharge plug-removing stick-releasing integrated process for the ternary compound combination flooding oil well. The non-discharge plug-removing stick-releasing integrated working fluid and process have the advantages of high efficiency of scale clearing and plug removing, low cost, safety and environmental protection.

The invention discloses a washing method for obtaining low-sulfur hydrated chromic oxide. The washing method includes the steps that (1) hydrated chromic oxide prepared from sodium chromate or sodium dichromate in a hydrothermal-reduction mode is pulped and then separated through a filtering machine, countercurrent washing is carried out, and first filtered liquid and first hydrated chromic oxide are obtained; (2) the first hydrated chromic oxide is pulped, a carbonic acid solution is added at the room temperature, the mixture is stirred, the pulped liquid is acidized, the temperature is increased and then kept, and hydrated-chromic-oxide neutralized slurry liquid is obtained; (3) the hydrated-chromic-oxide neutralized slurry liquid is separated through a filtering machine, countercurrent washing is carried out, and second filtered liquid and second hydrated chromic oxide are obtained. According to the washing method, the series of problems that when the hydrated chromic oxide is washed, inorganic acid or organic acid serves as an acidifying agent, low-sulfur hydrated chromic oxide cannot be obtained, the production cost is high, and safety and environmental protection risks exist are solved; by means of the washing method for obtaining the low-sulfur hydrated chromic oxide, the low-sulfur hydrated chromic oxide can be obtained, the using amount of washing water is effectively saved, the washing efficiency of the hydrated chromic oxide is improved, and the production cost is reduced.

The invention discloses a device and a method for producing ADC by a chorine oxidation method. The device comprises a water-washing tower, a cooler, a water mist separator and a chlorine inlet reactor which are connected with one another sequentially; the chlorine inlet reactor comprises a reaction kettle, a circulating pipeline, a circulating pump and an ejector or a Venturi tube; a liquid inlet of the ejector or the Venturi tube is connected with one end of the circulating pipeline; the other end of the circulating pipeline is connected with a discharging opening of the reaction kettle; a liquid outlet of the ejector or the Venturi tube is connected with a feeding opening of the reaction kettle; a suction opening of the ejector or the Venturi tube is communicated with a chloride discharge pipe of the water mist separator; and the circulating pump is arranged on the circulating pipeline. The device and the method for producing the ADC by the chorine oxidation method has the following advantages: a sulfuric acid drying tower is not used and a large amount of waste sulfuric acid is not generated; a chlorine compressor is not used, so the investment cost is reduced and the risk of high-pressure chlorine leakage is avoided; a high-pressure chlorine pipeline is not needed, so a large amount of leakage accidents are reduced; and the economic benefit is high, and safety and environmental friendliness are achieved.

The invention discloses a pre-joint-coating method for a welded junction of a steel pipe. The pre-joint-coating method comprises the steps that a stainless steel short pipe is inserted into the steelpipe from the end of the welded junction, so that a first end and a second end of the stainless steel short pipe are located in the steel pipe; from the first end, in the direction away from the shortpipe, a welding gun rotates and performs bead weld to the inner wall of the steel pipe to a first end point to form a first welding layer; from the first end point to the second end, the first welding layer and the stainless steel short pipe are solidly dissolved by the welding gun in order to form a point potential gradual transition from low carbon alloy to stainless steel, and the contact surface of the first welding layer and the short pipe is formed into a slope-like transition; and from the second end to the end of the welded junction, the bead weld of the inner wall of the steel pipe is performed by the welding gun to form a second welding layer. The pre-joint-coating method for the welded junction of the steel pipe solves the technical problem in the prior art that the anticorrosion joint coating for the interior of the steel pipe is difficult, and achieves the technical effect of reducing the risk of safety and environmental protection caused by corrosion leakage of the pipeline.

The invention provides an anti-backflow device for incoming liquid in a low-potential well group, which includes an anti-backflow pipeline and a straight-through pipeline. The anti-backflow pipeline and the straight-through pipeline are connected in parallel, and one end of the parallel connection communicates with the incoming liquid pipeline of the low-potential well group. One end is connected with the liquid inlet pipeline of the main shut-in well group; the anti-backflow pipeline is provided with solenoid valve 1, pressure gauge 1, check valve, pressure gauge 3, needle valve, solenoid valve 2 in sequence according to the direction of entering the station. The pipeline is provided with pressure gauge 2 and solenoid valve 3 in sequence according to the direction of entering the station. The invention can prevent a single well from backflowing to the wellhead of a single well due to pressure relief from other well groups in the station, reduce safety and environmental protection risks, prevent oil and gas well gathering and transportation pipelines from accumulating and freezing, and reduce difficulties in production and management of oil and gas wells.

The invention relates to a method for harmless treatment and recovery of magnesium fluoride polluted acid in a zinc smelting process, comprising: 1) harmless reuse of polluted acid; Seeds, modifiers, demagnesiasing agents, lime, etc., heat up and stir, filter to obtain demagnesium solution and magnesium fluoride concentrate, add tannic acid to the demagnesium solution to precipitate germanium, recover germanium, and filter to obtain germanium tannin Slag and germanium precipitation liquid, tannin and germanium slag are burned to obtain germanium concentrate, and the post germanium precipitation liquid is sent to leaching air for oxygen purification to remove iron and fluorine; 3) air oxidation to remove iron and fluorine after germanium precipitation; 4) iron removal After fluorine, the liquid copper slag is dechlorinated. The invention achieves the open circuit of magnesium oxide, reduces the harm of magnesium oxide in the hydrometallurgical zinc solution system, and recovers magnesium, fluorine and acid harmlessly; by adding active agent, the problem of easy formation of colloid in high zinc-containing solution is solved, and fluorine is changed. The characteristics of magnesium fluoride slag in high zinc ion solution make magnesium fluoride slag form a spongy structure, which is easy for liquid-solid separation.

The present invention discloses a method for preparing anhydrous sodium chromate. The method comprises the steps of mixing a sodium chromate alkali solution with a carbonating solution in proportion of (1:1) to (8:1), and then, adjusting the pH to 6.5-8.5 to obtain a pretreatment solution of sodium chromate; placing the pretreatment solution of sodium chromate in an evaporation crystallizer for vacuum evaporation at the temperature of 80 DEG C to 120 DEG C under the pressure of 0.01 MPa to 0.09 MPa; and when the solid-to-liquid ratio reaches 10%-50% through vacuum evaporation, performing solid-liquid separation at the temperature of 70 DEG C or above to obtain anhydrous sodium chromate and a filtrate. Based on the technology characteristics of sodium dichromate preparation by a carbonation method, high-quality anhydrous sodium chromate is successfully prepared by the method disclosed by the invention, with the main content being equal to or greater than 99.5% and the content of all impurities such as sulfate being less than 0.001%; moreover, the product does not absorb moisture or cake even if stored for a long term, and has good fluidity. The problems of sodium chromate tetrahydrate on easy moisture absorption, caking and poor fluidity are successfully solved. The method also brings into play the superiority of a production process of preparing sodium dichromate from a chromium salt by the carbonation method, so that two high-quality chemical products can be produced on one production line.

The invention provides a huff-and-puff oil production device with a submersible directly-driven screw pump. The huff-and-puff oil production device comprises an underground automatic water injection switch for realizing water injection and oil production channel switching and a submersible directly-driven screw pump, wherein a liquid outlet in the upper end of the underground automatic water injection switch is connected with an oil pipe, and a liquid inlet in the lower end of the underground automatic water injection switch is connected with an oil outlet in the upper end of the submersible directly-driven screw pump through the oil pipe; the submersible directly-driven screw pump comprises a screw pump, a flexible shaft, an upper protect tor, a lower protector, a submersible motor and a centralizer which are non-coaxially connected from top to bottom; the upper end of the screw pump is connected with the lower end of the underground automatic water injection switch; and the screw pump and the submersible motor are respectively electrically connected to a submersible cable outside a wellhead. The huff-and-puff oil production device is free of repeatedly tripping and has the characteristics of simple and convenient operation flow, high construction efficiency, safety, environment friendliness, low risk and the like; and due to the adoption of the lifting way, the huff-and-puff oil production device has the characteristics of low rotating speed and large torque and is suitable for a well with low liquid quantity, the eccentric wear of pipe poles is eliminated, the maintenance-free period of an oil well is prolonged, and the economic benefit can be effectively increased.

The invention belongs to the welding field of surfacing prefabricated internal joint bimetallic pipes, in particular to a bimetallic welding construction process method for surfacing prefabricated internal joint bimetallic pipes, which adopts double U-shaped butt joint grooves and melts the prefabricated The blunt edge of the inner joint layer is fused to form the root welding layer, which realizes the reliable connection of the corrosion-resistant alloy prefabricated inner joint layer, and forms the transition welding layer through the melting and leveling of the metal in the surfacing welding fusion zone, and realizes the transition to the low carbon steel welding layer. Transition, the weld seam welding is completed through the filling cover of the low carbon steel welding material in the weld seam; the bimetallic weld seam completed by this method solves the technical problem that the low carbon steel welding material cannot weld the stainless steel base material, and avoids the prefabricated interior The risk of electrochemical corrosion caused by the melting of the corrosion-resistant alloy layer into the low-carbon steel component ensures the physical and chemical properties of the weld; this process is important for the popularization and application of corrosion-resistant alloy prefabricated internal joints and internal anti-corrosion pipelines, and to improve the life of the pipeline effect.

The invention belongs to the technical field of mechanical oil production and particularly provides a huff-and-puff oil production device with an electric submersible reciprocating pump. The huff-and-puff oil production device comprises an underground automatic water injection switch (6) for realizing water injection and oil production channel switching and an electric submersible reciprocating pump, wherein a liquid outlet (9) in the upper end of the underground automatic water injection switch (6) is connected with an oil pipe (4), and a liquid inlet (10) in the lower end of the underground automatic water injection switch (6) is connected with an oil outlet in the upper end of an electric submersible reciprocating pump through the oil pipe (4). The huff-and-puff oil production device is free of repeatedly tripping and has the characteristics of simple and convenient operation flow, high construction efficiency, safety, environment friendliness, low risk and the like as comparison with the traditional huff-and-puff oil production process. In addition, due to the adoption of an electric submersible reciprocating pump (a linear motor) device adopted in a lifting way, underground driving link is omitted, the eccentric wear of pipe poles is eliminated, the maintenance-free period of an oil well is prolonged, the huff-and-puff oil production device is suitable for a well with low liquid quantity, and the economic benefit can be effectively increased.

The invention discloses a washing method for obtaining low-sulfur hydrated chromic oxide. The washing method includes the steps that (1) hydrated chromic oxide prepared from sodium chromate or sodium dichromate in a hydrothermal-reduction mode is pulped and then separated through a filtering machine, countercurrent washing is carried out, and first filtered liquid and first hydrated chromic oxide are obtained; (2) the first hydrated chromic oxide is pulped, a carbonic acid solution is added at the room temperature, the mixture is stirred, the pulped liquid is acidized, the temperature is increased and then kept, and hydrated-chromic-oxide neutralized slurry liquid is obtained; (3) the hydrated-chromic-oxide neutralized slurry liquid is separated through a filtering machine, countercurrent washing is carried out, and second filtered liquid and second hydrated chromic oxide are obtained. According to the washing method, the series of problems that when the hydrated chromic oxide is washed, inorganic acid or organic acid serves as an acidifying agent, low-sulfur hydrated chromic oxide cannot be obtained, the production cost is high, and safety and environmental protection risks exist are solved; by means of the washing method for obtaining the low-sulfur hydrated chromic oxide, the low-sulfur hydrated chromic oxide can be obtained, the using amount of washing water is effectively saved, the washing efficiency of the hydrated chromic oxide is improved, and the production cost is reduced.