CN115263209A - Method for recycling oil-based mud from oil-based mud drilling waste - Google Patents
Method for recycling oil-based mud from oil-based mud drilling waste Download PDFInfo
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- CN115263209A CN115263209A CN202210913225.0A CN202210913225A CN115263209A CN 115263209 A CN115263209 A CN 115263209A CN 202210913225 A CN202210913225 A CN 202210913225A CN 115263209 A CN115263209 A CN 115263209A
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- 238000005553 drilling Methods 0.000 title claims abstract description 44
- 239000002699 waste material Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004064 recycling Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000003825 pressing Methods 0.000 claims abstract description 41
- 238000000926 separation method Methods 0.000 claims abstract description 37
- 238000004062 sedimentation Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000012216 screening Methods 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000003814 drug Substances 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 7
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- 230000000087 stabilizing effect Effects 0.000 claims description 10
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 7
- CEQFOVLGLXCDCX-WUKNDPDISA-N methyl red Chemical compound C1=CC(N(C)C)=CC=C1\N=N\C1=CC=CC=C1C(O)=O CEQFOVLGLXCDCX-WUKNDPDISA-N 0.000 claims description 7
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 3
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
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- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/068—Arrangements for treating drilling fluids outside the borehole using chemical treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a method for recovering oil-based mud from oil-based mud drilling waste, relates to treatment of the oil-based mud in drilling, and aims to solve the problems that in the prior art, the effect of recovering the oil-based mud from the oil-based mud drilling waste is poor, and the separation and desorption effects of solid waste and oil are poor. The method comprises the following steps: stirring and uniformly mixing large-particle drilling cuttings, hot water and a medicament, which are generated by screening the drilling fluid through a vibrating screen, and then carrying out spiral conveying treatment; and carrying out centrifugal sedimentation treatment on the fine particle silt screened out by the vibrating screen, the liquid generated by the spiral conveying treatment and the liquid generated by the filter-pressing separation treatment, recycling the water obtained by the centrifugal sedimentation separation, collecting the oil, injecting steam into the solid, carrying out filter-pressing separation treatment on the materials conveyed by the spiral conveying together, and collecting the solid after drying treatment. After the method is adopted, the oil content in the solid waste is greatly reduced, and the effect of recovering oil-based mud and the waste oil separation efficiency are improved.
Description
Technical Field
The invention belongs to the technical field of oil and gas exploitation, relates to treatment of oil-based mud in shale gas, dense gas and conventional oil and gas field drilling, and particularly relates to a method for recovering oil-based mud from oil-based mud drilling waste.
Background
Oil-based muds have significant advantages for drilling projects, particularly in salt-paste formations, water-sensitive formations. The oil-based mud takes diesel oil, white oil, biological oil, mineral oil, synthetic oil and the like as base oil liquid to be added with various oilfield chemical agents, and is oil which is commonly used internationally at presentBase mud type. The oil-based mud drilling waste generated in the oil-based mud drilling process mainly comprises oil-containing drilling cuttings, vibrating screen leakage slurry, well cementation flowback mixed slurry, leakage stoppage flowback fluid, well completion tank cleaning bottom mud and the like. The single well production is about 250-500m3The oil content is about 18-25%, wherein (1) the liquid phase in the waste oil-based drilling mud mainly comprises oil base and mud additive; the solid phase mainly comprises: such as barite powder and broken rock debris, the solid-phase substance has wide particle size distribution from micron to centimeter. (2) The mud tank bottom mud is mainly residual oil-based mud in a mud tank, wherein a liquid phase mainly comprises oil base and a mud additive, and a solid phase mainly comprises: such as barite powder, ultrafine rock debris, and bentonite powder, the particle size of the solid phase is small, generally 10um. (3) The well cementation flowback mixed slurry is used as a mixture with drilling mud generated in the drilling process, wherein a liquid phase mainly comprises an oil base, formation water and a mud additive, and a solid phase mainly comprises: such as barite powder, cement powder and partially crushed rock debris, the particle size of the solid phase is small, and is 10um to 1000um.
The main pollutant in the oil-based mud drilling waste is waste oil, which is HW08 type hazardous waste calibrated in the national hazardous waste records. Long-term accumulation or landfill can cause serious damage to surface vegetation, polluting soil and water sources. According to the requirement of environmental protection, the waste oil-based mud drilling wastes such as waste oil-based mud, oil-based mud drill cuttings and the like are subjected to post-treatment. The conventional ways of treating oil-based mud or drill cuttings include incineration, pyrolysis, landfill, microbial degradation, and the like. The burning method has large investment, high operation cost and easy secondary pollution. Landfill disposal does not achieve true harmlessness of the pollutants, but merely transfers the pollutants to the ground, and the pollutants may be diffused when meeting rainfall or underground runoff. The microbial treatment cycle is long, and the requirement on environmental conditions is high.
The invention patent with the application number of 201410033980.5 discloses a process for recovering oil-based mud from oil-based mud drilling waste, which comprises the processes of efficient centrifugal filtration, homogenization and centrifugal sedimentation, realizes the efficient recovery of oil-based mud in oil-containing waste generated in oil-based mud drilling engineering through the optimization of process parameters, and achieves the standard of a recycling drilling process. The process has the characteristics of high recovery rate of the oil-based mud, capability of directly recycling the recovered oil-based mud for drilling engineering, no secondary pollution, simple process, mild operating conditions and the like, and is suitable for treating the oily waste generated by various oil-based mud drilling engineering. After the treatment and recovery process disclosed by the invention is adopted for treatment, the oil-based slurry resource in the oil-containing waste is efficiently recovered, the recovery rate is high, the pollutant content is greatly reduced, and the economic benefit and the environmental benefit are obvious.
Although the above prior art can separate and recover the waste oil in the mud to a certain extent, the oil in the mud is low in demulsification efficiency due to the simple adoption of centrifugal filtration, homogenization, centrifugal sedimentation, deep desorption, distillation and condensation and the like, the waste oil is low in separation efficiency, and the waste oil is poor in separation and desorption effects, so that a method for recovering the oil-based mud from the oil-based mud drilling waste with a better effect is provided, and the separation and desorption effects of the waste oil are improved.
Disclosure of Invention
The invention aims to: in order to solve the problems of poor effect of recovering the oil-based mud from the oil-based mud drilling waste and poor separation and desorption effects of solid waste and oil in the prior art, the invention provides a method for recovering the oil-based mud from the oil-based mud drilling waste.
The invention specifically adopts the following technical scheme for realizing the purpose:
a method for recovering oil-based mud from oil-based mud drilling waste comprises the steps of carrying out vibration screening treatment on drilling fluid from a drilling well hole, and carrying out spiral conveying treatment after large particles generated by the vibration screening treatment are uniformly stirred with hot water and a medicament; carrying out centrifugal sedimentation treatment on small-particle silt generated by vibration screening treatment, liquid generated by spiral conveying treatment and liquid generated by filter pressing separation treatment, returning water obtained by centrifugal sedimentation separation to a drilling well hole for recycling, collecting oil obtained by centrifugal sedimentation separation through an oil collecting barrel, carrying out filter pressing separation treatment on solid obtained by centrifugal sedimentation separation, steam and materials conveyed by the spiral conveying, and collecting the solid generated by filter pressing separation treatment after drying treatment;
the medicament consists of the following components in percentage by weight: 62 to 67 weight percent of sulfonic acid, 11 to 16 weight percent of potassium aluminum sulfate, 14 to 18 weight percent of water, 0.1 to 0.3 weight percent of methyl red, 0.1 to 0.15 weight percent of maleic anhydride and 2 to 5 weight percent of reverse demulsifier.
Preferably, the vibration screening treatment adopts a vibration screen, the vibration screening treatment comprises a supporting seat and a base connected with one side of the supporting seat, a bottom plate is placed on the base, a screen box is connected onto the bottom plate through an elastic part, and an excitation motor is installed on the screen box; a driving mechanism for driving the bottom plate and the sieve box to rotate together is connected between the base and the bottom plate.
Preferably, the driving mechanism comprises a first driving rocker and a second driving rocker which are hinged on the base, the other end of the first driving rocker is hinged with a first driven rocker, the other end of the second driving rocker is hinged with a second driven rocker, and the other end of the first driven rocker and the other end of the second driven rocker are both hinged with the bottom plate; the middle part of the second driving rocker is hinged with the middle part of the first driven rocker.
Preferably, the spiral conveying treatment adopts a spiral conveyor, the spiral conveyor comprises a casing, a rotating shaft arranged in the casing, a spiral blade arranged on the rotating shaft, and a driving motor arranged on the casing and used for driving the rotating shaft to rotate, and a plurality of spray heads are uniformly distributed on the upper edge of the inner side wall of the casing along the length direction of the casing.
Preferably, the pitch L of the helical blades decreases gradually in the direction of transport of the material.
Preferably, the filter-pressing separation treatment adopts a filter press, the filter press comprises a frame and a filter chamber assembly arranged on the frame, the filter chamber assembly comprises a plurality of groups of filter plates which are arranged in a stacked mode, an air inlet and a water outlet are formed in the outer frame of each group of filter plates, the end surfaces of two sides of each group of filter plates are inwards sunken, a plurality of air outlets and water inlets are uniformly distributed on the working surface of each group of filter plates, the air outlets are communicated with the air inlets through air channels in the filter plates, and the water inlets are communicated with the water outlets through water channels in the filter plates; the opposite end surfaces of two adjacent filter plates are sunken to form filter pressing cavities, and the adjacent filter pressing cavities formed between the multiple groups of stacked filter plates are communicated through a central through hole on each filter plate; the H-shaped filter cloth is sleeved on each group of filter plates, the middle connecting part of the H-shaped filter cloth penetrates through a central through hole in each filter plate, the filtering part of the H-shaped filter cloth is positioned in the depression of each filter plate, and the pressing part of the H-shaped filter cloth is pressed between every two adjacent groups of filter plates.
Preferably, the temperature of the steam entering the filter pressing cavity through the air inlet and the air outlet is 150-175 ℃, the steam pressure is 2-3 kg, and the pressure stabilizing time is 10-20min.
Preferably, the centrifugal sedimentation treatment adopts a centrifugal sedimentation device, the rotating speed of a rotary drum of the centrifugal sedimentation device is 1500-2000r/min, and the differential speed between the rotary drum and a pushing spiral is 200-250r/min.
The invention has the following beneficial effects:
1. in the invention, large particles screened out by vibration are uniformly mixed with a medicament and then are continuously sprayed by hot water in the process of spiral conveying, oil is demulsified, showered and separated from slurry under the action of the medicament and the hot water, and solid containing certain moisture is conveyed to a filter press by a spiral for separation; when the filter press carries out filter pressing and separation, after a certain amount of materials are filled and before filter pressing, steam with a certain temperature is filled and pressure stabilizing treatment is carried out, oil attached to solid particles is further evaporated and leached out at high temperature, and the content of the oil in the waste residue is greatly reduced; the liquid that flows out during screw conveying and that contain the medicament and the liquid that filter-pressing separation produced will be sent into centrifugal sedimentation equipment by the pump and subside, and under medicament and centrifugation, the effect of subsiding, profit mud three-phase further separates, and the water that separates gets into well cyclic utilization again, and the oil that separates is collected, and the solid that separates will be collected after through filtering separation, drying. The whole process is simple, the oil content in waste residues generated by independently collecting and drying waste oil is greatly reduced, water is recycled, the oil-based mud recycling effect is good, the waste oil separation efficiency is high, and the environment-friendly requirement is met.
2. In the invention, the vibrating screen is arranged into a split structure, and a driving mechanism is arranged between the screen box and the mounting base; during normal screening treatment, the driving mechanism is locked, and the screening box is used for screening materials; when the screen is blocked after screening for a certain time, the driving structure is unlocked and drives the screen box to rotate to be vertically placed on the supporting seat, and a blocking object on the screen is separated from the screen and falls out under the action of an exciting force, so that the screen is cleaned; the whole process is convenient and quick to operate, the screen frame does not need to be detached and then cleaned, and the cleaning efficiency of the screen is high
3. According to the invention, a plurality of spray heads are uniformly distributed in the screw conveyer, hot water can be sprayed to the materials in the screw conveying process, on one hand, the hot water can mix the medicament with the materials, on the other hand, the hot water can also wash out the oil adhered to the particles after demulsification through spraying, so that the content of the oil adhered to the particles is greatly reduced, finally, the content of the oil in the separated and dried solid waste is greatly reduced, and the effect of recovering oil-based mud and the waste oil separation efficiency are improved.
4. In the invention, when filter pressing separation is carried out, a certain amount of wet materials to be separated are filled into the filter press, then the feed inlet and the water outlet of the filter press are closed, steam is filled into the filter press through the air inlet and the pressure is stabilized for a certain time, oil is further demulsified and separated out under the action of the medicament in the high-temperature and material moisture, and is separated out from the particle surface in the subsequent filter pressing process, enters into liquid and is finally discharged from the water outlet, so that the content of oil adhered to particles is greatly reduced, the content of oil in the separated and dried solid waste is greatly reduced, and the effect of recovering oil-based mud and the waste oil separation efficiency are improved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic illustration of the construction of the shaker of the present invention;
FIG. 3 is a schematic view of the shaker of the present invention after being inverted;
FIG. 4 is a schematic view of the construction of the screw conveyor of the present invention;
FIG. 5 is an exploded view of a plurality of filter plates in a filter press according to the present invention;
figure 6 is a schematic view of the installation of a set of filter plates and filter cloths in the filter press of the present invention;
figure 7 is a schematic diagram of the construction of the filter plate in the filter press of the present invention;
FIG. 8 is a schematic view of the structure of a filter cloth in the filter press of the present invention;
wherein the reference numerals are:
11-supporting seat, 12-bottom plate, 13-driving mechanism, 14-excitation motor, 15-sieve box, 16-elastic component, 17-base, 21-H type filter cloth, 22-filter plate, 31-driving motor, 32-liquid outlet, 33-feed inlet, 34-rotating shaft, 35-helical blade, 36-nozzle, 37-discharge outlet, 38-machine shell, 131-second driven rocker, 132-second driving rocker, 133-first driven rocker, 134-first driving rocker, 211-pressing part, 212-filtering part, 213-middle connecting part, 221-gas channel, 222-water channel, 223-gas inlet, 224-water outlet, 225-gas outlet, 226-water inlet, 227-central through hole.
Detailed Description
Example 1
The embodiment provides a method for recovering oil-based mud from oil-based mud drilling waste, which comprises the following treatment steps of vibration screening, spiral conveying, filter-press separation, centrifugal sedimentation, drying and the like, and specifically comprises the following steps:
the drilling fluid (i.e., oil-based mud) exiting the borehole is first screened. During screening treatment, primary screening treatment and secondary screening treatment can be selected according to actual conditions, no matter primary screening treatment and secondary screening treatment are carried out, the vibrating screens are adopted for screening, and only when secondary screening treatment is carried out, the screen holes of the screen meshes of the front vibrating screen and the screen meshes of the rear vibrating screen are different in size. The embodiment adopts one-level screening processing, sets up a shale shaker promptly, and drilling fluid is through the shale shaker screening processing back, and oversize is the large granule, and undersize is the liquid that contains the tiny particle. After large particles of oversize materials are uniformly mixed with the medicament and water, the mixture is conveyed to a filter press in a spiral conveying mode to be subjected to filter pressing separation treatment; the undersize liquid containing small particles is pumped into a centrifugal settling device for centrifugal settling treatment. When carrying out auger delivery, adopt screw conveyer to carry, because treat that the transported substance material is the great material of humidity, and it has hot water to constantly spray at screw conveyer's in-process, therefore also can realize the solid-liquid separation of certain effect during auger delivery, screw conveyer carries the material that has certain humidity that separates to the pressure filter and carries out filter-pressing separation processing, and the liquid that contains certain granule that separates then is sent into centrifugal sedimentation equipment by the pump and is carried out centrifugal sedimentation. When the filter press carries out filter pressing treatment, after a certain amount of materials (the materials are objects to be subjected to filter pressing and mainly are water-solid mixtures) are filled, steam is filled into the filter press, the filter press carries out filter pressing after stabilizing the pressure for a certain time, liquid generated by the filter pressing is pumped into a centrifugal settling device for centrifugal settling, and solid generated by the filter pressing is collected and used for other purposes after being dried by a dryer. The centrifugal settling equipment receives undersize materials (liquid containing small-particle silt) subjected to vibration screening, liquid separated by screw conveying and liquid separated by filter pressing, and then filter pressing and settling are carried out together. In addition, a steam-water heater is provided, which can supply hot water for the screw conveyor and steam for the filter press and the dryer.
The medicament consists of the following components in percentage by weight: 62 to 67 weight percent of sulfonic acid, 11 to 16 weight percent of potassium aluminum sulfate, 14 to 18 weight percent of water, 0.1 to 0.3 weight percent of methyl red, 0.1 to 0.15 weight percent of maleic anhydride and 2 to 5 weight percent of reverse demulsifier.
The temperature of the steam entering the filter pressing cavity through the air inlet and the air outlet is 150-175 ℃, the steam pressure is 2-3 kg, and the pressure stabilizing time is 10-20min.
The centrifugal sedimentation treatment adopts a centrifugal sedimentation device, the rotating speed of a rotary drum of the centrifugal sedimentation device is 1500-2000r/min, and the differential speed of the rotary drum and a pushing spiral is 200-250r/min.
Example 2
On the basis of embodiment 1, vibratory screen adopts the shale shaker to handle, vibratory screen includes the base that supporting seat, supporting seat one side are connected. The vibrating screen is characterized in that a bottom plate is placed on the base, a screen box is connected to the bottom plate through an elastic component, a screen frame is placed in the screen box, and a vibrating motor is installed on the screen box. A driving mechanism for driving the bottom plate and the sieve box to rotate together is connected between the base and the bottom plate. A locking mechanism is arranged between the base and the bottom plate, and when the vibrating screen is used, the locking mechanism is in a locking state, and the base and the bottom plate cannot move relatively; when the screen needs to be cleaned, the locking mechanism is in a locking releasing state, and the base and the bottom plate can be separated and move relatively.
The driving mechanism comprises a first driving rocker and a second driving rocker which are hinged on the base, the first driving rocker is driven and rotated by a driving motor, and the other end of the first driving rocker is hinged with a first driven rocker. The other end of the second driving rocker is hinged with a second driven rocker, and the other end of the first driven rocker and the other end of the second driven rocker are both hinged with the bottom plate; the middle part of the second driving rocker is hinged with the middle part of the first driven rocker.
The working principle is as follows: when screening is carried out, the locking mechanism is in a locking state, the vibration exciting motor works to generate an exciting force, and screening of materials is realized under the action of the elastic component; when the screen cloth needs to be cleaned, the locking mechanism is in a locking releasing state, the driving motor drives the first driving rocker to rotate, the second driving rocker, the first driven rocker and the second driven rocker are driven to rotate in the rotating process of the first driving rocker, the linked driving mechanism drives the bottom plate and the screen box to rotate together to be vertically placed on the supporting seat, then the excitation motor works, and materials blocked on the screen cloth are separated from the screen cloth; the driving motor drives the first driving rocker to rotate reversely until the bottom plate and the screen box are placed on the base together.
Example 3
On the basis of embodiment 1 or embodiment 2, screw conveyer is adopted in the auger delivery processing, screw conveyer includes the casing, has seted up feed inlet, liquid outlet and discharge gate on the casing, is provided with the pivot along the length direction of casing in the casing, is provided with helical blade in the pivot along the length direction of pivot, still is provided with driving motor on the casing, driving motor's output shaft and pivot fixed connection, and driving motor can drive the pivot rotatory. The upper edge of the inner side wall of the casing is provided with a plurality of nozzles which are communicated with the steam hot water boiler, and the plurality of nozzles are uniformly distributed along the length direction of the casing.
In addition, the screw pitch L of the spiral blade is gradually reduced along the conveying direction of the materials, and the spiral blade plays a certain role in extruding the materials in the process of conveying the materials, so that the oil can be conveniently extruded from the particles.
In addition, along the direction of delivery of material, the water yield of shower nozzle reduces gradually.
The working principle is as follows: large particles of oversize materials subjected to vibration screening enter a screw conveyor through a feed inlet in a machine shell after being uniformly mixed with medicament and water, hot water is sprayed into the screw conveyor through a spray head in the conveying process of the screw conveyor, oil adhered to the particles is separated out under the action of the medicament and the hot water, the oil enters water and is pumped into centrifugal settling equipment for centrifugal settling, and materials with certain humidity are conveyed into a pressure filtration separator for pressure filtration separation treatment.
Example 4
On the basis of the embodiment 1, the embodiment 2 or the embodiment 3, a filter press is adopted for filter-pressing separation treatment, the filter press comprises a frame and a filter chamber assembly arranged on the frame, and the connection relation between the frame and the filter chamber assembly can be realized by adopting the conventional connection mode. The filter chamber component comprises a plurality of groups of filter plates which are arranged in a stacked mode, an air inlet and an water outlet are formed in the outer frame of each group of filter plates, the end faces of two sides of each group of filter plates are inwards sunken, a plurality of air outlets and water inlets are uniformly distributed on the working face of each group of filter plates, the air outlets are communicated with the air inlet through air channels in the filter plates, and the water inlets are communicated with the water outlets through water channels in the filter plates; the opposite end surfaces of two adjacent filter plates are sunken to form filter pressing cavities, and the adjacent filter pressing cavities formed between the multiple groups of stacked filter plates are communicated through a central through hole on each filter plate; the H-shaped filter cloth is sleeved on each group of filter plates, the middle connecting part of the H-shaped filter cloth penetrates through a central through hole in each filter plate, the filtering part of the H-shaped filter cloth is positioned in the depression of each filter plate, and the pressing part of the H-shaped filter cloth is pressed between every two adjacent groups of filter plates.
The air inlet of the filter press is communicated with the steam hot water furnace.
The working principle is as follows: inputting materials with certain humidity conveyed by a screw and solid materials separated by a centrifugal settling device into a filter press; stopping filling a certain amount of materials after the materials are filled into the filter press, closing a feed inlet and a water outlet of the filter press, filling steam into a filter pressing cavity in the filter press through a gas inlet on a filter plate, keeping a certain pressure and stabilizing the pressure for a certain time, and separating oil adsorbed and adhered to particles into water; then closing the air inlet, opening the water outlet, performing filter pressing treatment by using a filter press, discharging the filter-pressed water out of the water outlet for collection, and pumping the water into centrifugal sedimentation equipment for centrifugal sedimentation treatment; and after the filter pressing is finished, carrying out subsequent drying treatment and collection on the solid between the filter plates.
Examples of the experiments
Experiments were performed using the structure and method of example 4, with the experimental parameters for each example as follows:
experimental example 1: the aperture of the screen mesh of the vibrating screen is 0.2mm; the medicament formula is as follows: 63 percent of sulfonic acid, 16 percent of potassium aluminum sulfate, 17 percent of water, 0.2 percent of methyl red, 0.1 percent of maleic anhydride and 3.7 percent of reverse demulsifier; the temperature of steam in the filter press is 155 ℃, the steam pressure is 2 kilograms, and the pressure stabilizing time is 13 minutes; the rotating drum rotating speed of the centrifugal settling equipment is 1600r/min, and the differential speed of the rotating drum and the pushing spiral is 210r/min.
Experimental example 2: the aperture of the screen mesh of the vibrating screen is 0.2mm; the medicament formula is as follows: 65 percent of sulfonic acid, 14 percent of aluminum potassium sulfate, 16 percent of water, 0.3 percent of methyl red, 0.15 percent of maleic anhydride and 4.55 percent of reverse demulsifier by weight; the temperature of steam in the filter press is 160 ℃, the steam pressure is 2.5 kg, and the pressure stabilizing time is 15min; the rotating drum speed of the centrifugal sedimentation equipment is 1900r/min, and the differential speed of the rotating drum and the pushing spiral is 240r/min.
Experimental example 3: the aperture of the screen mesh of the vibrating screen is 0.5mm; the medicament formula is as follows: 66 percent of sulfonic acid, 15 percent of aluminum potassium sulfate, 15 percent of water, 0.2 percent of methyl red, 0.12 percent of maleic anhydride and 3.68 percent of reverse demulsifier by weight; the temperature of steam in the filter press is 170 ℃, the steam pressure is 2 kilograms, and the pressure stabilizing time is 18 minutes; the rotating speed of a rotary drum of the centrifugal sedimentation equipment is 1700r/min, and the differential speed of the rotary drum and the pushing spiral is 220r/min.
Experimental example 4: the aperture of the screen mesh of the vibrating screen is 0.5mm; the medicament formula is as follows: 67% by weight of sulfonic acid, 13% by weight of aluminum potassium sulfate, 16% by weight of water, 0.1% by weight of methyl red, 0.1% by weight of maleic anhydride and 3.8% by weight of reverse demulsifier; the temperature of steam in the filter press is 170 ℃, the steam pressure is 2 kilograms, and the pressure stabilizing time is 18 minutes; the rotating speed of a rotary drum of the centrifugal sedimentation equipment is 1500r/min, and the differential speed of the rotary drum and the pushing spiral is 220r/min.
The test was carried out by using the above experimental examples, and the detailed test results were as follows:
Claims (8)
1. a method of recovering oil-based mud from oil-based mud drilling waste, the method comprising: performing vibration screening treatment on drilling fluid discharged from a drilling well, and performing spiral conveying treatment after stirring and uniformly mixing large particles generated by vibration screening treatment with hot water and a medicament; carrying out centrifugal sedimentation treatment on small-particle silt generated by vibration screening treatment, liquid generated by spiral conveying treatment and liquid generated by filter pressing separation treatment, returning water obtained by centrifugal sedimentation separation to a drilling well hole for recycling, collecting oil obtained by centrifugal sedimentation separation through an oil collecting barrel, carrying out filter pressing separation treatment on solid obtained by centrifugal sedimentation separation, steam and materials conveyed by the spiral conveying, and collecting the solid generated by filter pressing separation treatment after drying treatment;
the medicament consists of the following components in percentage by weight: 62 to 67 weight percent of sulfonic acid, 11 to 16 weight percent of potassium aluminum sulfate, 14 to 18 weight percent of water, 0.1 to 0.3 weight percent of methyl red, 0.1 to 0.15 weight percent of maleic anhydride and 2 to 5 weight percent of reverse demulsifier.
2. A method of recovering oil based mud from oil based mud drilling waste as in claim 1 wherein: the vibration screening treatment adopts a vibration screen, the vibration screening treatment comprises a supporting seat (11) and a base (17) connected with one side of the supporting seat (11), a bottom plate (12) is placed on the base (17), the bottom plate (12) is connected with a screen box (15) through an elastic part (16), and an excitation motor (14) is installed on the screen box (15); a driving mechanism (13) for driving the bottom plate (12) and the screen box (15) to rotate together is connected between the base (17) and the bottom plate (12).
3. A method of recovering oil-based mud from oil-based mud drilling waste as claimed in claim 2 wherein: the driving mechanism (13) comprises a first driving rocker (134) and a second driving rocker (132) which are hinged on the base (17), the other end of the first driving rocker (134) is hinged with a first driven rocker (133), the other end of the second driving rocker (132) is hinged with a second driven rocker (131), and the other end of the first driven rocker (133) and the other end of the second driven rocker (131) are both hinged with the bottom plate (12); the middle part of the second driving rocker (132) is hinged with the middle part of the first driven rocker (133).
4. A method of recovering oil based mud from oil based mud drilling waste as in claim 1 wherein: spiral conveying handles and adopts screw conveyer, screw conveyer includes casing (38), sets up pivot (34) in casing (38), sets up helical blade (35) on pivot (34), sets up driving motor (31) that are used for driving pivot (34) rotation on casing (38), and the length direction equipartition that goes up the reason edge along casing (38) of casing (38) inside wall has a plurality of shower nozzles (36).
5. The method of recovering oil-based mud from oil-based mud drilling waste of claim 4, wherein: the pitch L of the helical blade (35) is gradually reduced along the conveying direction of the materials.
6. A method of recovering oil-based mud from oil-based mud drilling waste as claimed in claim 1 wherein: the filter-pressing separation treatment adopts a filter press, the filter press comprises a frame and filter chamber components arranged on the frame, the filter chamber components comprise a plurality of groups of filter plates (22) which are arranged in a stacked mode, an air inlet (223) and a water outlet (224) are arranged on the outer frame of each group of filter plates (22), the end faces of the two sides of each group of filter plates (22) are inwards sunken, a plurality of air outlets (225) and water inlets (226) are uniformly distributed on the working face of each group of filter plates (22), the air outlets (225) are communicated with the air inlets (223) through air passages (221) in the filter plates (22), and the water inlets (226) are communicated with the water outlets (224) through water passages (222) in the filter plates (22); the opposite end surfaces of two adjacent filter plates are sunken to form filter pressing cavities, and the two adjacent filter pressing cavities formed between the multiple groups of stacked filter plates (22) are communicated through a central through hole (227) on each filter plate (22); h-shaped filter cloth (21) is sleeved on each group of filter plates (22), a middle connecting part (213) of the H-shaped filter cloth (21) penetrates through a central through hole (227) in each filter plate (22), a filtering part (212) of the H-shaped filter cloth (21) is located in a recess of each filter plate (22), and a pressing part (211) of each H-shaped filter cloth (21) is pressed between two adjacent groups of filter plates (22).
7. The method of recovering oil-based mud from oil-based mud drilling waste of claim 6, wherein: the temperature of the steam entering the filter pressing cavity through the air inlet (223) and the air outlet (225) is 150-175 ℃, the steam pressure is 2-3 kg, and the pressure stabilizing time is 10-20min.
8. A method of recovering oil-based mud from oil-based mud drilling waste as claimed in claim 1 wherein: the centrifugal sedimentation treatment adopts a centrifugal sedimentation device, the rotating speed of a rotary drum of the centrifugal sedimentation device is 1500-2000r/min, and the differential speed of the rotary drum and a pushing spiral is 200-250r/min.
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| CN103758474A (en) * | 2013-12-05 | 2014-04-30 | 王兵 | Process for recycling oil base mud from oil base mud well drilling waste |
| CN103773408A (en) * | 2013-12-05 | 2014-05-07 | 王兵 | Process for recycling oil-based mud and oil bases from oil-based mud drilling wastes |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030037922A1 (en) * | 2001-08-27 | 2003-02-27 | Apv North America, Inc. | System and method for processing oil-based mud cuttings |
| CN101949271A (en) * | 2010-09-30 | 2011-01-19 | 成都西部石油装备有限公司 | Low-temperature vehicle-mounted oil drilling fluid purifying system during drilling and repairing |
| CN103758474A (en) * | 2013-12-05 | 2014-04-30 | 王兵 | Process for recycling oil base mud from oil base mud well drilling waste |
| CN103773408A (en) * | 2013-12-05 | 2014-05-07 | 王兵 | Process for recycling oil-based mud and oil bases from oil-based mud drilling wastes |
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