22 results about "Wax precipitation" patented technology

The present application belongs to the technical field of oil production matching technology, and discloses a high-coagulation heavy oil reservoir cold damage evaluation method, which utilizes physical simulation and numerical simulation methods to analyze the reservoir cold damage degree, reversibility, the minimum temperature for avoiding cold damage and the reservoir temperature recovery time from quantitative and qualitative aspects, wherein the physical simulation firstly determines the crude oil properties through the crude oil viscosity-temperature and wax precipitation experiments, then utilizes the core to carry out breakthrough pressure experiments to determine the occurrence temperature of the reservoir cold damage, startup pressure experiments to determine the minimum temperature for avoiding damage, relative permeability experiments to determine the influence degree of the cold damage on the reservoir percolation capacity, mercury injection experiments to analyze the influence of the cold damage on the reservoir pore structure, and two-dimensional nuclear magnetic experiments and laser confocal experiments to determine whether the cold damage is reversible and the reversible temperature; the numerical simulation is utilized to analyze the recovery time required for different liquid amounts and different temperature working liquids to enter the formation, so as to finally achieve the purposes of reducing the development cost of the high-coagulation oil reservoir and improving the development effect.

The invention discloses a CO2 drive reservoir producing well shaft phase change point calculation method. The method comprises the following steps that S1, a bubble point temperature-pressure relation curve and a wax precipitation temperature-pressure relation curve of a target well are calculated; s2, calculating a temperature-well depth relation curve and a pressure-well depth relation curve of the target well under different working conditions; s3, calculating a bubble point temperature-well depth relation curve and a wax precipitation temperature-well depth relation curve under different working conditions; s4, calculating gas-liquid phase change point depths and wax precipitation phase change point depths under different working conditions; s5, obtaining a calculation formula and a calculation formula through multiple linear regression; s6, the actually-measured production conditions of the target well are substituted into the calculation formula, and the phase change point of the target well under the production conditions can be calculated. According to the method, rapid and accurate prediction of the phase change point of the shaft of the CO2 flooding producing well is realized.

The invention relates to the technical field of oil and gas field development, and discloses a method, a system, equipment and a medium for evaluating the influence of wellbore dirt on organic solid phase deposition. The method comprises the steps of determining temperature fields corresponding to different wellbore positions of a single well, correspondingly setting a first temperature according to the temperature fields where the different wellbore positions are located, cooling at a set speed according to the first temperature, recording the change condition of differential heat flow to the temperature in real time, and drawing differential scanning calorimetry curves under the different wellbore positions when a second temperature is reached, determining a wax precipitation point and an interpolation base line of a wellbore temperature interval based on differential scanning calorimetry curves at different wellbore positions, further determining the wax content in the process from the well bottom to the wellbore, further obtaining the organic solid phase deposition in the crude oil at different wellbore positions, and calculating the organic solid phase deposition in the crude oil based on the organic solid phase deposition in the crude oil at different wellbore positions. And evaluating the influence of wellbore dirt on organic solid-phase deposition in crude oil. The method truly and accurately simulates the influence of different shaft positions on organic solid phase deposition.

The application provides a pipeline wax deposition effect testing system and method, the testing system comprising: a wax precipitation device, a sonar detection device and a processing device; the wax precipitation control device is used for controlling the wax precipitation process in the pipeline, the wax precipitation process is the process that the wax is precipitated and deposited in the pipeline; the sonar detection device is used for emitting a first sound wave into the pipeline after the end of the wax precipitation process, and recovering a second sound wave corresponding to the first sound wave, and sending the data of the first sound wave and the second sound wave to the processing device; the processing device is used for determining the form of the wax deposition in the pipeline according to the data of the first sound wave and the second sound wave. The application can effectively obtain the characteristics of the wax deposition.

The invention discloses an intelligent monitoring, predicting and cleaning integrated robot for well wall wax precipitation. Relates to the technical field of oil exploitation equipment. A non-contact laser distance measuring sensor is arranged in a detector fixing box; the rotating mechanism comprises a rotating rod, a rotating base and a rotating motor, the detector fixing box is connected with the rotating rod, and the output end of the rotating motor is meshed with a transmission gear on the rotating rod through a transmission gear; the middle walking mechanism comprises a main support, a spring compression assembly and a walking wheel installation sheet. The tail cleaning mechanism comprises a mounting base and a scraper, and the mounting base is connected with the end, away from the detector fixing box, of the rotating rod. The intelligent monitoring, predicting and cleaning integrated robot for well wall wax precipitation has good self-adaptive capacity and structural stability, is suitable for continuous operation under various complex pipe diameter conditions caused by wax precipitation in the oil and gas well production process, achieves intelligent real-time monitoring, scientific prediction and autonomous cleaning, and is high in practicability and high in practicability. And the oil field maintenance efficiency and economic benefits are obviously improved.

The present application relates to a kind of methods for extracting oil and rubber oil dewaxing, it is characterized in that using the composite solvent of polar solvent and solubilizer is dewaxing solvent, polar solvent uses N-methyl pyrrolidone, solubilizer is the mixture of one, two or three of benzene, toluene, xylene, above wax precipitation temperature, the composite solvent is mixed with extracting oil or rubber oil, then crystallization is cooled, filtration is obtained wax cream and filtrate, wax cream and filtrate are respectively heated and evaporated to recover solvent and obtain wax and dewaxed oil.

The invention belongs to the field of pipeline cleaning, and particularly relates to an oil field pipeline cleaning mechanism which comprises transition pipes communicating with the two ends of a pipeline needing to be cleaned and an impurity removing device used for cleaning the pipeline. The two transition pipes are located on the inner sides of the pipeline switch valves respectively, the transition pipes are Y-shaped bypass short sections welded to the pipelines, and cleaning channels are formed between the bypass short sections of the two transition pipes and the pipelines communicated with the bypass short sections. The guide rope is reserved in the pipeline, when the interior of the pipeline needs to be cleaned, only the first flange of the transition pipe bypass short section needs to be opened, the fixing device for limiting the guide rope needs to be removed, then the connector at one end of the guide rope is connected with one winch through the scraper, and the connector at the other end of the guide rope is directly connected with a lead of the other winch. And then the winches are started, the two winches work alternately, so that the purpose that the scrapers efficiently clean impurities in the pipeline is achieved, the problems of internal scaling and pipe blockage caused by wax precipitation are solved, the structure is simple, cost is low, and environmental protection is achieved.

This invention relates to the field of oil pumping unit control system technology, and particularly to an intelligent control method and system for a rotary motor commutating oil pumping unit. An intelligent control method for a rotary motor commutating oil pumping unit includes the following steps: S1: During the process of the oil pumping unit collecting high-wax crude oil, downhole environmental data and oil pumping unit operating data are collected in real time; S2: A pressure wax precipitation model is constructed based on the downhole environmental data, and a wax precipitation risk index is calculated based on the pressure wax precipitation model; S3: The pumping unit's resistance strength index is calculated based on the pumping unit operating data and the wax precipitation risk index; S4: The target operating stroke of the pumping unit is optimized based on the resistance strength index; S5: The rotary motor is commutated based on the target operating stroke. This invention can achieve a dynamic balance between fluid supply capacity utilization and wax deposition suppression, and can dynamically adapt to different oil well geological conditions and crude oil wax precipitation characteristics.

The application discloses a multi-chemical agent comprehensive treatment method for improving low-temperature fluidity of crude oil. The method comprises the following steps: S1, heating crude oil to a first predetermined temperature above a wax melting point and keeping the temperature for a first predetermined time, then adding a pour point depressant to perform first stirring treatment at the first predetermined temperature; S2, after the first stirring is completed, cooling the crude oil to a second predetermined temperature between a wax precipitation point and a freezing point of the crude oil and keeping the temperature for a second predetermined time, then adding a heavy oil viscosity reducer to perform second stirring treatment at the second predetermined temperature, and completing the multi-chemical agent comprehensive treatment. The method utilizes multi-chemical agent comprehensive treatment, can further improve the low-temperature fluidity of the crude oil, and is expected to bring a new solution to solve problems in the process of crude oil pipeline transportation and storage.

The utility model discloses an indoor experiment evaluation device for shale oil well dynamic wax precipitation, and belongs to the technical field of oil and gas exploitation. Comprising an injection unit which is connected with a mixing unit and is used for conveying experimental fluid to the mixing unit; the mixing unit is connected with the pipeline simulation unit and is used for mixing experimental fluid and inputting the mixed experimental fluid into the pipeline simulation unit; the pipeline simulation unit is connected with the pressure control unit and is used for simulating a fluid flowing environment in a shaft; the temperature control unit is arranged below the pipeline simulation unit, is connected with the data processing unit and is used for adjusting the temperature of the pipeline simulation unit; the monitoring unit is connected with the pipeline simulation unit and the data processing unit and is used for monitoring the temperature, pressure and wax precipitation state in the pipeline simulation unit; the data processing unit is connected with the temperature control unit and the monitoring unit and used for collecting and processing experimental data. The device simulates the temperature, pressure and fluid flowing state of a complex environment in a shaft, and dynamically researches the paraffin precipitation behavior and rule of an oil well.

The invention discloses a crude oil viscosity reduction method, device, equipment, medium and product, and the method comprises the following steps: obtaining physical parameters of crude oil to be treated, the physical parameters including density, condensation point, wax precipitation point, wax content, total wax precipitation amount, colloid content and asphaltene content; generating an electric field parameter and a processor parameter according to the physical property parameter and a target viscosity reduction effect; and according to the electric field parameters and the processor parameters, performing viscosity reduction treatment on the crude oil to be treated through an electric field processor. The viscosity of crude oil to be treated is effectively reduced, and the fluidity of crude oil transportation is guaranteed.

The invention belongs to the technical field of oil and gas field development, and discloses a method and system for analyzing wax precipitation characteristics of crude oil in a shaft full temperature range, and the method comprises the steps: obtaining the average crystallization heat of a block wax sample, the shaft temperature range and a wax precipitation differential scanning calorimetry curve; according to the average crystallization heat of the block wax sample and a wax precipitation differential scanning calorimetry curve, calculating the wax content, the wax precipitation amount of crude oil and the wax precipitation amount of the crude oil at the corresponding unit temperature at different temperatures; according to the average crystallization heat of the block wax sample, the shaft temperature range and the wax precipitation differential scanning calorimetry curve, the wax precipitation amount at each temperature is calculated, the total wax precipitation amount at different temperatures is accumulated, and the wax precipitation degree in the shaft production period is determined. The average crystallization heat of a block wax sample and a wax precipitation differential scanning calorimetry curve are combined to determine the wax precipitation amount in a wellbore temperature range and the corresponding unit temperature wax precipitation amount at different temperatures, the wellbore wax precipitation condition is determined, and the situation that the cognition of an oil field on crude oil wax precipitation is generally limited to the wax precipitation point and the wax content is avoided.

The invention belongs to the technical field of railway locomotives, and particularly relates to an operation method of a locomotive winter fuel oil heating system, which is characterized in that heating links are respectively arranged on the inner side and the outer side of a fuel oil tank of a locomotive, heat energy generated in normal operation of the diesel locomotive is fully utilized, and extra electric energy is not consumed. The locomotive fuel tank has the beneficial effects that various heating means are added for the locomotive fuel tank, the fuel temperature of the locomotive fuel tank can be increased, the fuel fluidity can be improved, on the premise that normal operation of the locomotive is not affected, when the air temperature in winter in the north is low, the locomotive can normally use 0 # diesel oil to work, the wax precipitation phenomenon does not occur, and the service life of the locomotive is prolonged. The working time of low-grade diesel oil is prolonged even no-35 # diesel oil needs to be replaced, so that the fuel consumption cost in winter is reduced, the purposes of reducing cost and improving efficiency are achieved, the operation is flexible, the influence on an original oil supply system is reduced to the minimum, and the working efficiency of the diesel engine is not influenced.

The utility model provides a communication circuit board for intelligent analysis of edge data of an oil well and extraction equipment, which comprises a top-layer board body and a bottom-layer board body which are connected in a composite mode. The top layer plate body and the bottom layer plate body are jointly provided with a DI channel part, a DO channel part, an AO channel part, an AI channel part, a PWM channel part and an RS485 channel part; through the channels, safe and reliable transmission of multi-path data can be realized, and functions of data acquisition, intelligent remote control, indicator diagram acquisition and analysis, remote control, wax precipitation early warning, overload protection, load loss protection and the like of an oil well and extraction equipment can be realized, so that safe operation of the oil well and the extraction equipment is ensured; efficient interaction with a control platform can be achieved through remote communication, so that the real-time accuracy of data is guaranteed, efficient checking, remote control, analysis and management of oil wells and oil extraction equipment are facilitated, and powerful data support is provided for overhauling operation of the oil wells and the oil extraction equipment.

The utility model discloses a dewaxing device for sunflower seed oil processing, which comprises a water tank, a cooling tank is arranged in the water tank, the top of the cooling tank is fixedly communicated with a feed hopper, the bottom of the cooling tank is fixedly communicated with a connecting pipe, a filter tank is arranged below the water tank, the side wall of the water tank is fixedly connected with a motor, and the motor is fixedly connected with the water tank. A transmission rod is fixedly connected to the output end of the motor, two first stirring blades are fixedly connected to the outer wall of the transmission rod, and a plurality of second stirring blades are fixedly connected to the outer wall of the transmission rod. According to the device, cold water in the water tank can be stirred by arranging the first stirring blades so that the water temperature can be balanced, sunflower seed oil can be stirred by arranging the second stirring blades so that the sunflower seed oil can be cooled uniformly, and the wax precipitation effect is good; and the intercepted solid wax can be cleaned by arranging the filter screen which can be taken out in a detachable mode, operation is easy, the machining efficiency is improved, and blockage of the filter screen is avoided.

The application discloses a kind of CO2 drive oil reservoir oil production well wellbore phase transition point calculation methods, comprising the following steps: S1: calculating the bubble point temperature-pressure relationship curve and wax precipitation temperature-pressure relationship curve of target well;S2: calculating the temperature-depth relationship curve and pressure-depth relationship curve of target well under different working conditions;S3: calculating the bubble point temperature-depth relationship curve and wax precipitation temperature-depth relationship curve under different working conditions;S4: calculating the gas-liquid phase transition point depth and wax precipitation phase transition point depth under different working conditions;S5: by multiple linear regression, obtain calculation formula and calculation formula;S6: the production condition of target well measured is substituted into and calculation formula, the phase transition point of target well under this production condition can be calculated.This method realizes the fast and accurate prediction of CO2 drive oil production well wellbore phase transition point.

The application discloses a liquid sample crystallization real-time detection method based on an intelligent sensor and relates to the technical field of intelligent sensors.The method comprises the following steps: step 1, a liquid sample is combined with a toluene-acetone adjustable ratio ternary dewaxing medium composed of toluene, acetone and solvent oil according to a predetermined volume ratio, and a uniform mixed system is formed in a constant-temperature liquid preparation environment; step 2, the mixed system is placed into a sedimentation device; step 3, after an external physical field is terminated, the mixed system is allowed to stand and settle, wavelet analysis is performed to extract a wax precipitation signal, and a wax precipitation end point is determined according to a preset threshold; step 4, a wax-containing layer is separated at the wax precipitation end point, and the wax content of the liquid sample is output; and step 5, supernatant obtained after the standing and settling is completed is taken and reacted in a water bath to form a yellow complex.The application has the advantages of a short detection period, high separation efficiency, accurate signal recognition and objective and automatic calculation process.

The embodiment of the invention provides a prediction method for a wax precipitation point of wax-bearing crude oil, a control device and a storage medium, and belongs to the technical field of oil reservoir development. The prediction method comprises the following steps: performing molecular dynamics simulation on an initial model to obtain thermodynamic stability models corresponding to a plurality of temperatures; for the thermodynamic stability model corresponding to each temperature, grouping each paraffin molecule in the thermodynamic stability model according to the tail end distance of the paraffin molecule, and calculating the proportion of each group of paraffin molecules in the total number of the paraffin molecules; selecting the characterization value of the tail end distance of each group of paraffin molecules, and calculating the weighted average tail end distance based on the characterization value of the tail end distance of each group of paraffin molecules and the proportion of each group of paraffin molecules to the total number of paraffin molecules; and predicting the wax precipitation point of the target wax-bearing crude oil by comparing the microstructure and the weighted average end distance of the thermodynamic stable model corresponding to each temperature. Based on molecular dynamics simulation, the prediction method provided by the embodiment of the invention can provide support for accurately predicting the wax precipitation point of the wax-bearing crude oil.

The invention provides a wax emulsion for cotton fiber finishing and a preparation method thereof, and relates to the technical field of cotton fiber finishing. The wax emulsion for cotton fiber finishing comprises 36-38 parts of paraffin and carnauba wax, 4-6 parts of an emulsifier, 0.01-0.2 part of acid and 56-60 parts of water, wherein the mass ratio of the paraffin to the carnauba wax is (8-12): 1; the mass ratio of the total amount of the paraffin and the carnauba wax to the emulsifier is (6-9): 1; the emulsifier comprises a nonionic emulsifier and a cationic emulsifier in a mass ratio of (1-5): 1; the nonionic emulsifier is fatty alcohol-polyoxyethylene ether. The wax emulsion has the advantages of less emulsifier dosage, no layering and no wax precipitation when stored at room temperature, can be effectively combined with cotton fibers, can be used for yarn softening finishing, improves the wear resistance and softness of the cotton fibers, and can ensure the retention of higher strength of the cotton fibers, and the particle size of the wax emulsion is less than 100nm.

The application relates to a microfluidic chip pour point depressant intelligent screening and optimization device and method integrating multi-parameter detection, wherein the microfluidic chip pour point depressant intelligent screening and optimization device integrating multi-parameter detection comprises an experiment module, a data acquisition module and a data analysis and control module; the experiment module comprises a power area, a conveying area, a temperature control area, an imaging area and a recovery area; the imaging area comprises a polarized microscope and a microfluidic chip; the microfluidic chip comprises a sample inlet channel, a storage chamber, a micro mixing chamber, a wax precipitation chamber and a temperature control system; the micro mixing chamber realizes efficient mixing of the pour point depressant and crude oil; the wax precipitation chamber simulates a complex flow state environment of an actual oil conveying pipeline, and is provided with a wax crystal morphology observation area, a wax crystal motion behavior observation area and a wax crystal dynamics behavior observation area, so as to observe the wax crystal flow state and collect wax crystal dynamic parameters; and the application realizes efficient dynamic adjustment of the pour point depressant formula through dynamic time sequence modeling of LSTM and strategy gradient optimization of PPO.

The utility model discloses an underground multi-stage composite anti-scale, anti-wax and anti-corrosion device, which comprises an upper joint, a lower joint and a lower joint, the upper end of the anti-corrosion outer pipe is screwed with the lower port of the upper joint; the anti-scale alloy core plates are arranged in the anti-corrosion outer pipe and are uniformly arranged along the cross section; the alloy spacer bushes are supported between the outer edges of the adjacent anti-scale alloy core discs; the core shaft penetrates through the center holes of the anti-scale alloy core plates to fix the anti-scale alloy core plates into a whole; the upper end of the vibration outer pipe is connected with the anti-corrosion outer pipe through an upper coupling; a plurality of vibration cores are uniformly arranged along the height direction of the inner cavity of the vibration outer pipe; the core spacer bushes are supported between the outer edges of the adjacent vibration cores; the upper end of the vortex outer pipe is connected with the vibration outer pipe through a lower coupling; the rotational flow inner pipe is positioned in the inner cavity of the vortex outer pipe and is coaxial with the vortex outer pipe; and the rotational flow sheet is positioned in the inner cavity of the rotational flow outer pipe and is wound on the outer wall of the rotational flow inner pipe. The device can simultaneously solve the problems of underground scaling, wax precipitation and corrosion, and has the advantages of environmental protection, high efficiency and low cost.

The application belongs to the technical field of materials, and provides a low-temperature crude oil pour point depressant with pH response and a preparation method thereof. Polymethyl acrylate and polyvinyl alcohol are dissolved in an organic solvent, a pH-sensitive monomer is added, and then mixed sufficiently under an inert atmosphere, and then the product is prepared through initiator polymerization, precipitation, separation and drying. The pour point depressant is modified by the pH-sensitive monomer, and the hydrophilicity and hydrophobicity can be dynamically adjusted according to the pH value of the environment. In an acidic environment, the pour point depressant promotes the dissolution of wax, and in an alkaline environment, the pour point depressant inhibits the growth of wax crystals, thereby significantly reducing the freezing point of crude oil. The pour point depressant has good stability in a humid and high-temperature environment, can effectively adapt to extreme conditions such as deep sea, high cold and high altitude, improves the efficiency of oil and gas exploitation and transportation, reduces the risk of wax precipitation, improves economic benefits, has environmental protection value, and provides an innovative solution to the problem of crude oil transportation.