32 results about "Oil-based mud" patented technology

A method of removing hydrogen sulfide from a subterranean geological formation includes mixing a zinc-imidazolate material, ZIF-8, in an amount of 0.1 to 2.5 percent by weight with an organic liquid containing one or more unsaturated oils to form a drilling fluid suspension with a pH of 10 or more. The method includes injecting the drilling fluid suspension in the subterranean geological formation, circulating the drilling fluid suspension in the subterranean geological formation to form an oil-based mud, and scavenging hydrogen sulfide from the subterranean geological formation.

The invention relates to the technical field of oil-gas exploration, in particular to a method for measuring the oil content of an oil-based mud polluted rock core (rock debris). The method comprises the following steps: oil-based mud fluorescence quantification, sample pretreatment, ultrasonic oscillation extraction, extraction liquid fluorescence analysis, wellhead oil solvent fluorescence quantification and oil content calculation. The method comprises the following steps: collecting oil-based mud and wellhead oil on an exploration site, treating the oil-based mud and the wellhead oil with pesticide residue-grade dichloromethane, and determining respective fluorescence fingerprint spectrograms and characteristic peaks through three-dimensional fluorescence detection; the method comprises the following steps: grinding a rock core (rock debris) sample to 60-80 meshes, carrying out ultrasonic extraction to obtain an extract, detecting a spectrogram, identifying and deducting an oil-based mud pollution peak, and calculating the oil content by combining the correlation between the fluorescence intensity and concentration of wellhead oil. The method can effectively distinguish the oil-based mud from the oil content of the sample, realizes accurate detection of the oil content of the polluted sample, makes up for insufficient core data, is suitable for evaluation of conventional, unconventional, deep and ultra-deep oil and gas reservoirs, and provides reliable support for oil and gas exploration and the like.

A method of removing hydrogen sulfide from a subterranean geological formation includes mixing a zinc-imidazolate material, ZIF-8, in an amount of 0.1 to 2.5 percent by weight with an organic liquid containing one or more unsaturated oils to form a drilling fluid suspension with a pH of 10 or more. The method includes injecting the drilling fluid suspension in the subterranean geological formation, circulating the drilling fluid suspension in the subterranean geological formation to form an oil-based mud, and scavenging hydrogen sulfide from the subterranean geological formation.

The invention discloses a cyclone separation unit, which is used for deoiling treatment of rock debris particles of more than 100 microns in oil-based mud, and at least comprises a plurality of material distribution cavities and barrel bodies which are arranged at intervals along the vertical direction; an oil-based mud material inlet and a gas inlet are formed in the top of the uppermost material distribution cavity and are used for receiving rock debris particles which are subjected to vibration screening and heating viscosity reduction treatment and contain the particle size of 100 microns or above and rotational flow driving gas; the multiple hydrocyclones are arranged in a multi-stage series-parallel connection mode; a multi-stage cyclone bin and a double-ring channel are arranged in each cyclone, and airflow carrying rock debris particles sequentially flows downwards in an outer ring of the double-ring channel, flows upwards in an inner ring of the double-ring channel and enters the multi-stage cyclone bin from top to bottom; in the cyclone bin, under the action of cyclone, airflow carries an oil phase removed from the rock debris particles to move upwards and flow out from an overflow port, and the rock debris particles move downwards under the action of gravity and are discharged from an underflow port. The invention further discloses an oil-based mud treatment device and method applying the cyclone separation unit.

The invention relates to the field of resistivity measurement, in particular to a while-drilling resistivity measurement device and a resistivity imaging method. A two-end type shielding electrode structure is adopted, the shielding capacity is optimized through numerical simulation, and the instrument detection depth is increased. The modularized detector can be flexibly installed, can also work independently and is convenient to install and maintain, and the measuring device can measure the formation resistivity and can also obtain the oil-based mud resistivity in real time. The problem that the accuracy of a final result is seriously influenced due to the fact that the oil-based mud resistivity cannot be independently obtained in the prior art is solved.

The utility model relates to the technical field of rotary kilns, in particular to a viscous waste oil-based mud continuous feeding device which comprises a bottom plate, a continuous feeding mechanism is arranged at the top of the bottom plate and comprises a feeding pipe used for feeding, a feeding mechanism is arranged at the top of the bottom plate, and the feeding mechanism comprises a discharging hopper used for discharging. According to the feeding device, a feeding pipe, an auger, a first motor box, a first motor, a feeding box, a motor and other components are included, the motor is started to drive a rotating column and drive a rotating plate to rotate, so that entering materials are discharged downwards in a sectional mode, and the phenomenon of blocking caused by unsmooth feeding is avoided; the feeding pipe is arranged, so that materials entering the feeding pipe are rotationally conveyed, continuous feeding of sticky waste oil-based mud is achieved, and it can be guaranteed that various to-be-treated materials generated in the while-drilling treatment production process in a well site can be continuously and stably fed and continuously produced.

The invention relates to the technical field of rubber core production, in particular to an oil-base-mud-resistant rotary rubber core and a production mold thereof.The oil-base-mud-resistant rotary rubber core comprises an upper mold and a lower mold, a bottom plate is welded to the bottom of an inner cavity of the lower mold, a supporting column is welded to the top of the bottom plate, a top plate is welded to the top of the supporting column, and an air bag is arranged between the bottom plate and the top plate; a shell is welded to the bottom of the lower mold, a first electric push rod is fixedly installed at the bottom of an inner cavity of the shell, an ejector rod is fixedly installed at the top of the first electric push rod, and a sliding block arranged in an inner cavity of the supporting column in a sliding mode is welded to the top of the ejector rod. A plurality of upper pull ropes, a plurality of middle pull ropes and a plurality of lower pull ropes are fixedly mounted on the peripheral wall of the sliding block, and sizing materials on the upper side and the lower side are continuously pushed to reciprocate by means of telescopic operation of the air bag, so that auxiliary materials which are not completely stirred in the sizing materials are stirred for the second time; and the stirring device can be uniformly mixed with the sizing material in the movement process of the sizing material.

The present invention provides a method for preparing rock cuttings for removing oil-based mud contamination. The method comprises cleaning and drying a sample of oil-based mud-contaminated rock cuttings, performing trace element determination on the cleaned and dried sample; physically grinding the cleaned and dried sample, and performing trace element determination on the ground rock cutting particles and rock cutting powder; and comparing and analyzing the multiple trace element determinations to analyze the degree of oil-based mud contamination in the rock cuttings and the effectiveness of removing the oil-based mud-contaminated rock cuttings. The present invention physically grinds mudstone rock cuttings contaminated by oil-based mud without using an organic solvent, gradually removing the oil-based mud adhering to the surface of the rock cuttings. This method preserves the original geochemical characteristics of the rock cuttings, accurately determines the degree of oil-based mud contamination, and completely removes the effects of organic mud contamination, providing accurate data support and technical guidance for various geochemical analysis tests and offshore oil and gas exploration.

The invention discloses a T2 spectrum form correction method, device and equipment in a tight gas reservoir oil-based mud invasion state and a storage medium, and relates to the technical field of logging data processing in oil-gas exploration. The method comprises the following steps: firstly, acquiring T2 spectrum data of to-be-corrected oil-based mud in a research area in an invasion state, secondly, decomposing the T2 spectrum data by utilizing a T2 spectrum decomposition method combining wavelet transform and Gaussian fitting, and determining a T2 spectrum correction equation by utilizing a fluid replacement method based on a decomposition result; and correcting T2 spectrum data to be corrected in an oil-based mud invasion state by using the obtained T2 spectrum correction equation. According to the method, many problems brought to NMR logging fluid identification after the oil-based mud invades the stratum can be solved more comprehensively and effectively, and more reliable and accurate technical support is provided for tight gas reservoir fluid identification work.

The present application relates to the technical field of cementing spacer fluid cleaning efficiency, and is a cementing spacer fluid oil-based mud cleaning efficiency evaluation device and method, the former comprising a simulation mechanism, a mud injection mechanism, a mud recovery container, a mud circulating mechanism, a spacer fluid injection mechanism, a spacer fluid recovery container and a cleaning effect detection mechanism, the simulation mechanism comprising a simulated wellbore and a simulated casing, the simulated wellbore being an upwardly open cylindrical container, and the lower part of the simulated casing being located in the simulated wellbore. The present application has a reasonable and compact structure and is easy to use. By setting the simulated wellbore, the simulated casing and the related mechanisms, the mud circulating process and the actual spacer fluid displacement oil-based mud process are simulated, the cleanliness of the inner wall of the simulated wellbore is detected by the cleaning effect detection mechanism, and thus the cleaning efficiency of the spacer fluid on the oil-based mud is evaluated, providing an important reference for the selection of cementing spacer fluid.

The invention discloses a rock debris hydrocarbon generation potential quantity determination method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining a target rock debris sample corresponding to a target depth interval; wherein the target rock debris sample is rock debris polluted by oil-based mud; determining an original hydrocarbon generation potential spectrogram and hydrocarbon generation measurement data based on the target rock debris sample, and determining a target hydrocarbon generation potential spectrogram based on the original hydrocarbon generation potential spectrogram and the hydrocarbon generation measurement data; and determining a target hydrocarbon generation potential corresponding to the target rock debris sample based on the target hydrocarbon generation potential spectrogram. Based on the above technical scheme, the rock debris sample corresponding to the target depth interval is obtained, and the target hydrocarbon generation potential is determined based on the target hydrocarbon generation potential spectrogram corresponding to the rock debris sample, and the sample does not need to be preprocessed, so that the technical effect of improving the determination efficiency of the hydrocarbon generation potential is achieved.

The utility model relates to the technical field of waste oil-based mud treatment, and discloses a cooling device for waste oil-based mud treatment, which comprises a tank body, a tank cover is arranged on the upper surface of the tank body, a cooling component is arranged on the upper surface of the tank cover, and a support frame I is fixedly connected to the upper surface of the tank cover. One end of the first supporting frame is fixedly connected with a first motor, and a stirring assembly is arranged at the output end of the first motor. The cooling assembly comprises a second flange, the lower surface of the second flange is fixedly connected into the tank cover, a first flange is arranged on the upper surface of the second flange, a first ventilation pipeline is fixedly connected to the upper surface of the first flange, and the outer wall of the first ventilation pipeline is fixedly connected with the output end of a fan. According to the device, the first limiting rod is rotated through the output end of the first motor, the first limiting rod drives the first stirring blade and the second stirring blade to conduct stirring, then the output end of the draught fan is connected with the first ventilation pipeline, cold air is output for cooling treatment, and then the practicability of the device is improved.

The present application belongs to the technical field of reservoir logging evaluation in oil and gas exploration, and discloses a method for calculating nuclear magnetic porosity of oil-based mud invaded oil layer. First, a core is selected to simulate the state of oil-based mud invading oil layer. Second, nuclear magnetic resonance (NMR) instruments are used to respectively perform NMR experimental measurement and processing on the core in the state of oil-based mud invading oil layer and the oil-based mud fluid sample, so as to obtain the NMR T2 spectrum of the core in the state of oil-based mud invading oil layer, the total amplitude of the NMR T2 spectrum, and the NMR porosity of the core in the state of oil-based mud invasion. Then, the total amplitude of NMR of the oil-based mud fluid sample and the core in the state of oil-based mud invading oil layer is calculated to obtain the total amplitude of NMR corrected by oil-based mud invasion. The total amplitude of NMR corrected by oil-based mud invasion is combined with the oil layer NMR porosity affected by oil-based mud invasion to calculate the NMR porosity corrected by the influence of oil-based mud invasion, so as to obtain the real porosity of the formation.

The invention discloses a natural gas maturity continuous detection method based on drilling rock debris tank head gas, and belongs to the field of deep sea oil-gas exploration, and the natural gas maturity continuous detection method comprises the following steps: S1, rock debris sample treatment; s2, collecting a sample; s3, storing and transporting the sample; s4, heating in a water bath; s5, testing and analyzing; and S6, data processing: fitting mudstone section light hydrocarbon maturity parameters and mud gas methane carbon isotope or kerogen vitrinite reflectivity, establishing a rock debris tank top gas light hydrocarbon maturity model, and estimating the maturity of natural gas / kerogen around an exploratory well. By optimizing the sample treatment and analysis process, continuous and low-cost detection of the natural gas maturity under the oil-based mud system is realized, and an efficient technical means is provided for deep sea oil-gas exploration. The method is verified in the practical application of the B52 well of the dolomitic sag in the Pearl Jiangkou basin, and the exploration precision requirement is met.

The utility model relates to the technical field of rotary kilns, in particular to a viscous waste oil-based mud pipeline flow measuring device which comprises a bottom plate, a feeding pipe is arranged at the top of the bottom plate, a rotary kiln is arranged on one side of the feeding pipe, and a quantitative feeding mechanism is arranged at the top of the bottom plate. The quantitative feeding mechanism comprises a feeding box used for feeding and a feeding box used for feeding, and a rotary connecting mechanism is arranged on one side of the feeding pipe. Slurry in a material box is pumped by starting a metering pump and then conveyed into a feeding box through a conveying pipe, then a motor is started to drive a threaded rod to rotate, a material storage box moves under the action of a driven rod, a blocking plate breaks away from blocking of an intercepting plate during moving, the blocking plate is opened, and the slurry is conveyed into the feeding box through a conveying pipe. The feeding device has the advantages that the feeding quantity cannot be accurately mastered, continuous feeding cannot be guaranteed and normal production is affected in the feeding process, and feeding smoothness is effectively guaranteed.

The present application relates to a kind of oil-based drilling cuttings harmless treatment system and method based on smoldering technology, smoldering technology is applied to the harmless treatment process of oil-based drilling cuttings generated in the process of oil-based drilling mud not falling, and the heat generated by tail gas treatment system is heated by heat exchanger to mud in the mud not falling treatment collection box, prevent freezing when winter construction, not only effectively ensure the complete oil-based mud not falling, protect the environment around drilling operation, while realizing the harmless treatment of oil-based drilling cuttings on site, avoid the risk of long-distance transportation of oil-based drilling cuttings to dangerous waste treatment plant for terminal processing.This application can carry out oil-based drilling cuttings reduction while drilling on-site, harmless treatment, realize production disposal to avoid the risk of oil-based drilling cuttings leakage in the process of transportation.At the same time, the waste heat of smoldering treatment process is fully utilized, and has the advantages of oil-based drilling cuttings disposal completely.

The application provides an oil-based mud debris recycling and cleaning device, and relates to the technical field of drilling. The oil-based mud debris recycling and cleaning device comprises a storage device, a cleaning device and a transfer device. The storage device comprises a base body and a plurality of storage mesh tubes, and the plurality of storage mesh tubes are positioned on the base body. The cleaning device comprises a cleaning box and a cleaning mechanism, the cleaning box has a cleaning cavity for positioning the storage mesh tubes, and the cleaning mechanism is installed on the cleaning box. The transfer device is used for transferring the storage mesh tubes between the base body and the cleaning box. The recycling and cleaning device has high automation, high operation efficiency, low labor intensity, convenient debris recycling and cleaning, and high data accuracy. Meanwhile, the device can obtain debris with higher purity, which is beneficial to obtaining drilling-related data through debris property analysis, and the obtained data is more accurate and reliable.

The application discloses an oil-based mud invasion high-wax crude oil formation in-situ nuclear magnetic resonance T2 spectrum acquisition method, which comprises the following steps: S1, constructing a nuclear magnetic resonance T2 spectrum model of saturated single-phase fluid through numerical simulation, and setting model parameters; S2, constructing a nuclear magnetic resonance T2 spectrum model of two-phase fluid with different oil-based mud saturations under the oil-based mud environment based on the nuclear magnetic resonance T2 spectrum model; S3, taking a core on a reservoir site, making a rock sample and performing a physical experiment, and measuring a nuclear magnetic resonance T2 spectrum of the rock sample; and S4, comparing and analyzing the nuclear magnetic resonance T2 spectrum obtained through the physical experiment with the two-phase fluid nuclear magnetic resonance T2 spectrum model obtained through numerical simulation, and obtaining a nuclear magnetic resonance logging response characteristic law of the oil-based mud invasion high-wax oil layer. The method has high calculation speed and excellent data processing capacity, can significantly improve the measurement precision and reliability of the magnetic resonance logging under the oil-based mud invasion, and is widely applicable to the fields of oil exploration and geological survey.

The invention discloses an oil-based mud resistant composite rotary blowout preventer rubber core and a preparation method thereof, and belongs to the technical field of sealing rubber cores special for rotary control heads for oil-based mud unbalanced pressure control drilling. The preparation method comprises the following steps: coating the surface of the inner-layer rubber with a composite binder, bonding the outer-layer rubber and the inner-layer rubber through the composite binder, and heating and curing to obtain the composite rotary blowout preventer rubber core. By designing and preparing the composite binder with hydrolysis resistance, oil resistance, acid and alkali resistance and high temperature resistance, the inner layer rubber with good rebound resilience and aging resistance and the outer layer rubber with good oil resistance, aging resistance and acid and alkali corrosion resistance are bonded and fixed to form the composite rotary blowout preventer rubber core; therefore, the technical problems proposed in the background technology are solved.

The utility model discloses a novel rock debris cleaning machine which comprises a cleaning tank composed of an inner tank and an outer tank, an ultrasonic vibrator is installed in a sandwich structure between the inner tank and the outer tank, a bracket is placed in the cleaning tank, a sample containing piece is placed on the bracket, a heater is arranged on the inner side of the cleaning tank, and the inner side of the cleaning tank is provided with a water inlet and a water outlet. A cleaning agent adding mechanism is arranged on one side of the cleaning tank, and an overflow opening is formed in the side wall of the cleaning tank. When water-based mud needs to be cleaned, the ultrasonic vibrator is started to provide ultrasonic vibration force for the cleaning tank, and then ultrasonic cleaning of a rock sample placed in the cleaning tank is achieved; when the oil-based mud needs to be cleaned, a cleaning agent can be added, a heater is used for heating cleaning liquid in the cleaning tank, meanwhile, high-pressure air is injected in cooperation with an aeration pipeline arranged at the bottom of the cleaning tank, bubbles are formed in the cleaning liquid in the cleaning tank, and the cleaning effect on the oil-based mud is further guaranteed.

The utility model provides oil-based mud storage equipment in the technical field of mud storage tanks, which comprises a support, a tank body arranged on the support, a tank cover mounted at the top of the tank body, the tank body consisting of a cylindrical tank body and a conical tank body, and a stirring component arranged in the tank body and comprising a central shaft, a stirring blade, a vertical plate, an inclined plate and a scraping plate, a plurality of stirring blades are arranged on the central shaft, are annularly arranged around the central shaft and are distributed at equal intervals in the axial direction of the central shaft; the scraping plate is in contact with the inner side walls of the cylindrical tank body and the conical tank body; the top of the center shaft penetrates through the tank cover and is fixedly connected with a stirring motor, the stirring motor is fixedly connected with the tank cover, the tank cover is provided with a feeding port, a breather valve and a laser radar, slurry and liquid are temporarily mixed through stirring blades, and oil-based slurry attached to the inner wall of the tank body is scraped off through a scraping plate; external impurities are prevented from entering through the breather valve, loss caused by liquid volatilization is reduced, and meanwhile discharging is facilitated; and the laser radar is arranged to help judge the storage capacity and the stirring time.

An oil-based mud while-drilling electrical imaging logging device and method, the main part of the logging device is the button electrode at the center position of the electrical imaging probe device, and the shielding electrode and the return electrode are sequentially arranged outward, the numerical simulation method and the physical experiment model method can determine the instrument constant of the oil-based mud while-drilling resistivity imaging logging, and the conversion between the measured impedance amplitude and phase information and the formation resistivity and the formation dielectric constant is realized; the fusion splicing strategy of the formation resistivity is formulated, the measured data under the multi-frequency condition are used to realize the fusion splicing calculation of the full-range formation resistivity; the neural network fitting method is used to establish the minimum objective function, and the inversion or optimization algorithm is used to realize the calculation of the formation resistivity, the formation dielectric constant and the electrode plate gap; the neural network algorithm is used to fit the forward response function, and then the inversion or optimization algorithm is used to obtain the formation resistivity, the gap and the formation dielectric constant, so that the oil and gas formation interpretation and evaluation are better served.

The utility model relates to the field of solid-liquid waste treatment, and discloses a waste oil-based mud while-drilling treatment device which comprises a fixing frame, a stirring barrel is fixedly connected to the side wall of the fixing frame, a stirring assembly is arranged in the stirring barrel, a filtering barrel is fixedly connected to the side wall of the fixing frame, and a filtering assembly is arranged in the filtering barrel. The filtering assembly comprises a discharging pipe, the side wall of the discharging pipe is fixedly connected to the side wall of the filtering barrel, a square groove is formed in the filtering barrel, and a fixing rod is arranged in the filtering barrel. According to the slurry solid-liquid separation device, treated slurry enters the filtering barrel through the conveying pipe and is filtered by the two layers of filtering frames, the first motor is started, the first rotating shaft drives the gear, the eccentric wheel knocks the filtering frames through chain transmission, the fixing block slides on the fixing rod to extrude the spring, and solid-liquid separation of the slurry is achieved; the problem that the solid-liquid separation speed of traditional gravity settling and single-layer filtering is low is solved, and the separation efficiency and effect are improved.

The present application relates to the oil and gas field development technical field, it is a kind of oil-based mud completion horizontal well wellbore dredging processing method, this method is carried out according to the following steps: first, the required amount of pretreatment liquid and flushing liquid are configured for standby;Second step, the coiled tubing is stretched to the first section of the wellbore perforation layer position, and the pretreatment liquid is placed in the whole wellbore by circulating pump, and the pretreatment liquid reacts with the oil-based mud residue in the inner wall of the wellbore;Third step, the coiled tubing is assembled with high-pressure rotating nozzle and stretched to the first section of the wellbore perforation layer position, and the flushing liquid is used to circulate flushing for the wellbore;Fourth step, after the wellbore flushing is completed, the coiled tubing is pulled out to complete the wellbore dredging processing operation. Oil-based mud in the inner wall of the casing can be effectively cleaned, the wellbore cleaning effect is improved, and the early wellbore cleaning guarantee is provided for subsequent wellbore, well logging, perforation and multi-section multi-cluster volume fracturing.

The invention provides a fluid identification method, system and equipment based on oil-based mud electric imaging and a medium. The method comprises the following steps: collecting crack data and dynamic image data of oil-based mud electric imaging after full-borehole coverage correction; obtaining coordinates of crack lines in the image based on the crack data and the oil-based mud electric imaging dynamic image data, and obtaining a segmented sub-image data body of the crack based on the coordinates of the suture lines in the image; obtaining a crack feature sub-image based on the segmented sub-image data body of the crack; obtaining the chromaticity of each crack based on the crack feature sub-image; based on the chromaticity of each crack, establishing a fluid identification standard based on the chromaticity of the crack, and obtaining a fluid identification result based on the fluid identification standard; according to the method, the application of oil-based mud electric imaging in reservoir fluid type identification is realized, a new means is provided for oil field logging fluid interpretation, and the coincidence rate and accuracy of oil field logging interpretation are improved.

The invention discloses a phase inversion spacer fluid for well cementation. The phase inversion spacer fluid is prepared from the following components in parts by weight: 0.3 to 0.7 part of defoaming agent PC-X62L, 2 to 4 parts of separant PC-S32S, 10 to 20 parts of phase inversion agent WS-W31L, 80 to 100 parts of weighting agent barite powder and 95 to 105 parts of water. When the phase inversion spacer fluid is added into cement paste and oil-based mud, an original oil phase system can be converted into a water phase system, the subsequent cleaning effect is guaranteed, and the cement paste can be better attached to a well wall and a casing pipe. And meanwhile, the cement paste strength can be controlled, the thickening safety window is prolonged, the rheological property is enhanced, and the cement paste has a wide application prospect in oil and gas well cementation.

The invention discloses a cyclone separation unit, which is used for deoiling treatment of rock debris particles with the particle size of less than 100 [mu] m in oil-based mud, and at least comprises: a barrel body, the top of which is provided with an oil-based mud material inlet and a gas inlet, and which is used for receiving rock debris particles with the particle size of less than 100 [mu] m and cyclone driving gas which are subjected to vibratory screening and heating viscosity reduction treatment; the multiple cyclones are arranged in one-stage parallel connection, and the multiple cyclones connected in parallel are arranged in the circumferential direction of the barrel body and located outside the barrel body; a multi-stage cyclone bin and a double-ring channel are arranged in each cyclone, and airflow carrying rock debris particles sequentially flows downwards in an outer ring of the double-ring channel, flows upwards in an inner ring of the double-ring channel and enters the multi-stage cyclone bin from top to bottom; in the cyclone bin, under the action of cyclone, airflow carries an oil phase removed from the rock debris particles to move upwards and flow out from an overflow port, and the rock debris particles move downwards under the action of gravity and are discharged from an underflow port. The invention further discloses an oil-based mud treatment device and method applying the cyclone separation unit.

The application provides a drilling fluid pollution alarm method, device, equipment and medium, the method comprises the following steps: S1, initializing the pollution occurrence threshold according to the pollution type, the pollution type comprises one or more of salt invasion, calcium pollution and oil-based mud pollution, the threshold value comprises one or more of drilling fluid density change rate threshold value, Cl ion concentration change threshold value, calcium pollution threshold value, demulsification voltage threshold value, filtration loss change threshold value and; S2, collecting drilling fluid performance parameter data, the drilling fluid performance parameter data comprises one or more of drilling fluid density, viscosity, shear force, filtration loss, Cl ion concentration, calcium ion concentration, demulsification voltage and pH value; and S3, confirming the pollution type and the pollution degree according to the drilling fluid performance parameter data and the threshold value, and performing alarm processing according to the pollution degree, the pollution degree is used to represent the weight of the determined pollution type. Different pollution phenomena are detected in real time based on monitoring the threshold values of different pollution types.

A permeability evaluation method based on oil-based mud electrical imaging logging, comprising: after processing oil-based mud electrical imaging logging data, determining a permeable layer section in a formation, and determining low-frequency relative permittivity and high-frequency relative permittivity of each sector of a target wellbore; on the basis of the low-frequency relative permittivity, the high-frequency relative permittivity, and characteristic parameters of each sector, constructing an invasion factor correlated with permeability; obtaining permeability experimental data generated after performing permeability measurements on rock cores of the permeable layer section, and performing formation depth alignment and orientation alignment; fitting the aligned permeability experimental data with the invasion factors, and generating a permeability calculation model; and calculating permeability by using the permeability calculation model. Further provided is a permeability evaluation apparatus based on oil-based mud electrical imaging logging. The invention achieves anisotropic permeability evaluation and continuous permeability evaluation in the longitudinal direction.

The application provides a fracture logging identification method and system under oil-based mud conditions, which can improve the precision of fracture logging identification under oil-based mud conditions, effectively evaluate the development degree of formation fractures, and judge the filling property of the fractures. The identification method comprises the following steps: S1, based on the conventional logging data of a formation to be analyzed, rock wave impedance values are calculated according to a density curve and a P-wave interval transit time curve; S2, the rock wave impedance values calculated are corrected according to a shale content curve in the conventional logging data, corrected wave impedance values are calculated according to a preset correction formula, and a corrected wave impedance curve graph is drawn; and S3, whether the fractures of the formation to be analyzed are developed is judged based on the corrected wave impedance values calculated, if the corrected wave impedance values are not greater than a preset wave impedance threshold value, it is indicated that the fractures of the corresponding formation are developed fractures, otherwise, the fractures are undeveloped fractures.