CN109576066B - Oil-based drilling cutting hot washing treatment agent formula and low-temperature hot washing treatment method - Google Patents
Oil-based drilling cutting hot washing treatment agent formula and low-temperature hot washing treatment method Download PDFInfo
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- 238000005520 cutting process Methods 0.000 title claims abstract description 101
- 238000005553 drilling Methods 0.000 title claims abstract description 74
- 238000005406 washing Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000007790 solid phase Substances 0.000 claims abstract description 85
- 238000003756 stirring Methods 0.000 claims abstract description 63
- 239000006228 supernatant Substances 0.000 claims abstract description 51
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 34
- 239000012459 cleaning agent Substances 0.000 claims abstract description 29
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 33
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 21
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims description 12
- 235000015165 citric acid Nutrition 0.000 claims description 11
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 7
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 7
- 239000001630 malic acid Substances 0.000 claims description 7
- 235000011090 malic acid Nutrition 0.000 claims description 7
- 235000006408 oxalic acid Nutrition 0.000 claims description 7
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 6
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 6
- 229960004889 salicylic acid Drugs 0.000 claims description 6
- 235000002906 tartaric acid Nutrition 0.000 claims description 6
- 239000011975 tartaric acid Substances 0.000 claims description 6
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 16
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 15
- 229910001424 calcium ion Inorganic materials 0.000 abstract description 15
- 150000007524 organic acids Chemical class 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 7
- 239000011575 calcium Substances 0.000 abstract description 7
- 229910052791 calcium Inorganic materials 0.000 abstract description 7
- 239000002244 precipitate Substances 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 156
- 239000000203 mixture Substances 0.000 description 14
- 239000007787 solid Substances 0.000 description 13
- 230000007613 environmental effect Effects 0.000 description 8
- 239000000839 emulsion Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 150000001721 carbon Chemical group 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 4
- 239000003599 detergent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000001376 precipitating effect Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002173 cutting fluid Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 235000019794 sodium silicate Nutrition 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- JHJUUEHSAZXEEO-UHFFFAOYSA-M sodium;4-dodecylbenzenesulfonate Chemical compound [Na+].CCCCCCCCCCCCC1=CC=C(S([O-])(=O)=O)C=C1 JHJUUEHSAZXEEO-UHFFFAOYSA-M 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
- C11D3/2082—Polycarboxylic acids-salts thereof
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
- C11D3/2086—Hydroxy carboxylic acids-salts thereof
-
- 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
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/005—Waste disposal systems
-
- C11D2111/44—
Abstract
The application discloses a formula of an oil-based drilling cutting hot washing treatment agent and a low-temperature hot washing treatment method. The treating agent comprises a gel breaking and viscosity reducing agent and a cleaning agent; the gel breaking and viscosity reducing agent comprises low-carbon chain organic acid; the cleaning agent comprises LAS type sodium dodecyl benzene sulfonate. The low-temperature hot washing treatment method comprises the following steps: mixing and stirring the oil-based drilling cuttings, water and the gel breaking viscosity reducer, standing, and skimming supernatant and oil to obtain a first solid phase; fully mixing and stirring the first solid phase, water and a cleaning agent, standing, and skimming supernatant and oil to obtain a second solid phase; and fully stirring and washing the second solid phase and water, standing, and skimming a supernatant to obtain a third solid phase. The gel breaking viscosity reducer and the cleaning agent used in the application are environment-friendly materials, the gel breaking viscosity reducer is formed by reacting organic acid capable of being dissolved in water with calcium ions in the oil-based drilling cuttings to generate organic acid calcium precipitate, the contact surface of the drilling cuttings and water is increased to the maximum extent, and the cleaning of the oil-based drilling cuttings is facilitated. The pH value after cleaning is between 6 and 8, and no secondary pollution is formed within the environment-friendly requirement range.
Description
Technical Field
The application relates to the technical field of oil-based drilling cutting treatment, in particular to a formula of a hot washing treatment agent for oil-based drilling cutting and a low-temperature hot washing treatment method.
Background
In oil drilling, an oil-based mud system is adopted, so that a large amount of oil-based drilling cuttings (containing 10-30 percent of oil) are generated, the oil-based drilling cuttings are a complex multi-phase system containing mineral oil, phenolic compounds and heavy metals, and the aromatic hydrocarbons in diesel oil extracted from the oil-based drilling cuttings have high biological toxicity. The oil field drilling production generates a large amount of waste mud or oil-based drill cuttings every day, the direct discharge of the waste oil-based mud and the oil-based drill cuttings can influence the nutritional environmental conditions and the quality of the crop growth, the long-term accumulation can cause serious damage to surface vegetation, soil and water sources are polluted, and the survival of human beings is endangered, the oil-based mud codes (071) 002-08 and 072 001-08) are listed in the name of hazardous wastes by the nation, the oil content must be reduced to be below 2 percent, the requirements of the nation and local governments are met, and higher requirements are provided by some local governments for using the oil-based mud and oil-based drill cuttings.
According to the requirement of environmental protection, the oil-based drilling cuttings are subjected to post-treatment. The conventional oil-based drilling cuttings treatment method comprises biodegradation, incineration treatment and the like, but the treatment effect of the biodegradation method on the oil-based drilling cuttings is limited by time and nature, a longer period is needed for decomposing and digesting the oil-based drilling cuttings, the process is also influenced by the natural environment, for some components in the oil-based drilling cuttings, the components cannot be decomposed well under natural conditions, microorganisms have choice for the treated sludge, and are suitable for oil sludge with oil content of less than 5%, the degradation period is long, a large amount of land is needed, the oil-based drilling cuttings contain various treating agents, and the oil content is generally greater than 10%; in the incineration and pyrolysis technology, a large amount of flue gas is generated to cause secondary pollution due to high-temperature heating; the extractant used in the extraction treatment is mostly toxic substance and the cost is high; the oil in the solidification technology is not removed, only the petroleum is coated, and the waste is increased; the medicament selected by the existing chemical hot washing is mainly alkaline material: caustic soda, sodium tripolyphosphate, sodium silicate, surfactant (branched chain type), demulsifier, etc., and the pH value is generally selected to be about 12.5. After hot washing, the pH value needs to be adjusted to meet the requirement of environmental protection, and most of used materials are not environment-friendly, which brings troubles to subsequent advanced treatment.
Disclosure of Invention
The application aims to provide an oil-based drilling cutting hot washing treatment agent formula and a low-temperature hot washing treatment method, so as to solve the problem that the subsequent advanced treatment is troublesome due to the fact that materials used in the existing chemical hot washing method are not environment-friendly.
In a first aspect, according to an embodiment of the application, a formula of a thermal washing treatment agent for oil-based drill cuttings is provided, and comprises a gel breaking viscosity reducer and a cleaning agent;
the gel breaking and viscosity reducing agent comprises a low-carbon chain organic acid, wherein the low-carbon chain organic acid is an organic acid with the carbon atom number of 2-7;
the cleaning agent comprises LAS type sodium dodecyl benzene sulfonate.
With reference to the first aspect, in a first implementation manner of the first aspect, the gel breaking and viscosity reducing agent includes at least one of oxalic acid, tartaric acid, malic acid, citric acid, and salicylic acid.
With reference to the first aspect, in a second implementable manner of the first aspect, the cleaning agent comprises at least one of linear LAS-90R, LAS-80R, LAS-70R, LAS-60.
In a second aspect, according to an embodiment of the present application, there is provided a method for low-temperature hot washing treatment of oil-based drill cuttings, including:
step S1, mixing and stirring the oil-based drilling cuttings, the water and the gel breaking viscosity reducer, standing, and skimming a supernatant and oil to obtain a first solid phase;
step S2, fully mixing and stirring the first solid phase, water and a cleaning agent, standing, and skimming supernatant and oil to obtain a second solid phase;
and step S3, fully stirring and cleaning the second solid phase and water, standing, skimming a supernatant to obtain a third solid phase, and discharging after the third solid phase reaches the standard.
With reference to the second aspect, in a first achievable form of the second aspect, the temperature of the water is 70 to 90 ℃.
With reference to the second aspect, in a second achievable form of the second aspect, the stirring speed is 800rpm, and the stirring time is 15 min.
With reference to the second aspect, in a third achievable form of the second aspect, the weight of the gel breaking viscosity reducer is 2.7-4% of the weight of the oil-based drill cuttings.
With reference to the second aspect, in a fourth implementable manner of the second aspect, the weight of the flushing agent is 2.7-3.5% of the weight of the oil-based drill cuttings.
With reference to the second aspect, in a fifth enablement of the second aspect, in step one, the weight ratio of the water to the oil-based drill cuttings is 1: 1; in the second step, the weight ratio of the water to the oil-based drill cuttings is 1: 1; in step three, the weight ratio of the water to the oil-based drill cuttings is 4: 1.
According to the technical scheme, the oil-based drilling cutting hot washing treatment agent formula and the low-temperature hot washing treatment method are provided in the embodiment of the application. The treating agent comprises a gel breaking viscosity reducer and a cleaning agent; the gel breaking and viscosity reducing agent comprises a low-carbon chain organic acid, wherein the low-carbon chain organic acid is an organic acid with the carbon atom number of 2-7; the cleaning agent comprises LAS type sodium dodecyl benzene sulfonate. The low-temperature hot washing treatment method comprises the following steps: mixing and stirring the oil-based drilling cuttings, water and the gel breaking viscosity reducer, standing, and skimming supernatant and oil to obtain a first solid phase; fully mixing and stirring the first solid phase, water and a cleaning agent, standing, and skimming supernatant and oil to obtain a second solid phase; and fully stirring and cleaning the second solid phase and water, standing, and skimming a supernatant to obtain a third solid phase. The gel breaking viscosity reducer and the cleaning agent used in the application are environment-friendly materials, the gel breaking viscosity reducer is formed by reacting organic acid capable of being dissolved in water with calcium ions in the oil-based drilling cuttings to generate organic acid calcium precipitates, the calcium ions in the oil-based drilling cuttings are removed, the colloidal stability of the oil-based drilling cuttings is damaged, the pH value is reduced, emulsion is made to lose stability, gel breaking is carried out, the viscosity is greatly reduced, the contact surface of the drilling cuttings and water is increased to the maximum extent, and the cleaning of the oil-based drilling cuttings is facilitated. The pH value after cleaning is between 6 and 8 and is within the range of environmental protection requirements. The production process is simple, secondary pollution is avoided, the subsequent microbial treatment method is facilitated, and higher requirement standards are met.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flow chart illustrating a method for treating oil-based drill cuttings by low-temperature hot washing according to an embodiment of the present application.
Detailed Description
According to the embodiment of the application, the oil-based drilling cutting hot washing treatment agent formula comprises a gel breaking viscosity reducer and a cleaning agent;
the gel breaking and viscosity reducing agent comprises a low-carbon chain organic acid, wherein the low-carbon chain organic acid is an organic acid with the carbon atom number of 2-7;
the cleaning agent comprises LAS type sodium dodecyl benzene sulfonate.
Calcium ions are vital in oil-based mud, CaO is used for adjusting and maintaining the alkalinity of the mud, the pH value of a dispersed water phase is maintained in an alkaline range, an emulsifier and a treating agent are enabled to obtain the optimal efficiency in the alkaline range, and some emulsifiers are organic calcium salts, so that the stability of an emulsion and the high-temperature stability of the mud are maintained; CaCl is selected as most of oil-based drilling fluids2As activity control agent, saline (generally 25% CaCl) is prepared2Brine ]; with CaCO3As a heavy weight sealant.
The low-carbon chain organic acid and the LAS type sodium dodecyl benzene sulfonate are environment-friendly materials, and the low-carbon chain organic acid is mainly widely distributed in leaves, roots and particularly fruits of plants and is mostly used for food and medicine. The gel breaking viscosity reducer is characterized in that organic acid capable of being dissolved in water reacts with calcium ions in the oil-based drilling cuttings to generate organic calcium precipitates, the calcium ions in the oil-based drilling cuttings are removed, the colloid stability of the oil-based drilling cuttings is damaged, the pH value is reduced, an emulsion is unstable, gel is broken, the viscosity is greatly reduced, the contact surface of the drilling cuttings and the water is increased to the maximum extent, and the cleaning of the oil-based drilling cuttings is facilitated. The reaction equation is as follows:
2R-COOH+CaCO3＝(R-COO)2Ca↓+CO2↑+H2O
2R-COOH+Ca2+＝(R-COO)2Ca↓
LAS type sodium dodecyl benzene sulfonate is easy to decompose and is the main raw material for producing detergent in modern times. The pH value after cleaning is between 6 and 8 and is within the range of environmental protection requirements. The production process is simple, secondary pollution is avoided, the subsequent microbial treatment method is facilitated, and higher requirement standards are met.
According to the technology, the low-carbon organic acid (carboxylic acid) has a good gel breaking and viscosity reducing effect in the cleaning of the oil-based drilling cuttings, the LAS sodium dodecyl benzene sulfonate cleaning agent has a good cleaning effect, the two materials and the product are basically harmless to the environment, the environment-friendly requirement is met, and the cleaning effect is achieved.
Further, the gel breaking and viscosity reducing agent comprises at least one of oxalic acid, tartaric acid, malic acid, citric acid and salicylic acid. One or more of oxalic acid, tartaric acid, malic acid, citric acid, salicylic acid, etc. mainly come from leaves, roots, especially fruits of plants, and are widely distributed, and most of the oxalic acid, tartaric acid, malic acid, citric acid, salicylic acid, etc. are used for food and medicine. The one or more organic acids can react with calcium ions in the oil-based drilling cuttings to generate organic acid calcium precipitates, the calcium ions in the oil-based drilling cuttings are removed, the colloid stability of the oil-based drilling cuttings is damaged, the pH value is reduced, the emulsion is destabilized, the gel is broken, the viscosity is greatly reduced, and the contact surface between the drilling cuttings and water is increased to the maximum extent.
Further, the cleaning agent comprises at least one of linear LAS-90R, LAS-80R, LAS-70R, LAS-60. LAS type sodium dodecyl benzene sulfonate is easy to decompose and is the main raw material for producing detergent in modern times. The linear LAS-90R, LAS-80R, LAS-70R, LAS-60 differs in the percentage of sodium dodecylbenzenesulfonate. The linear LAS-90R is 90% sodium dodecylbenzene sulfonate. LAS type sodium dodecyl benzene sulfonate is a high-efficiency surface active detergent, has good biodegradability, and solves the problem of pollution caused by detergent foam.
Referring to fig. 1, an embodiment of the present application provides a method for low-temperature hot washing treatment of oil-based drill cuttings, including:
step S1, mixing and stirring the oil-based drilling cuttings, the water and the gel breaking viscosity reducer, standing, and skimming a supernatant and oil to obtain a first solid phase;
the gel breaking viscosity reducer is characterized in that organic acid capable of being dissolved in water reacts with calcium ions in the oil-based drilling cuttings to generate organic calcium precipitates, the calcium ions in the oil-based drilling cuttings are removed, the colloid stability of the oil-based drilling cuttings is damaged, the pH value is reduced, an emulsion is unstable, gel is broken, the viscosity is greatly reduced, the contact surface of the drilling cuttings and the water is increased to the maximum extent, and the cleaning of the oil-based drilling cuttings is facilitated. Standing and precipitating the stirred liquid and silt for layering, skimming the supernatant and oil on the upper part, and precipitating the silt to be a first solid phase.
Step S2, fully mixing and stirring the first solid phase, water and a cleaning agent, standing, and skimming supernatant and oil to obtain a second solid phase;
the cleaning agent is dissolved in water and the first solid phase is thoroughly cleaned by stirring. And standing and precipitating the stirred liquid and sediment for layering, skimming the upper oil and mud-water mixture, and taking the precipitated solid as a second solid phase.
And step S3, fully stirring and cleaning the second solid phase and water, standing, skimming a supernatant to obtain a third solid phase, and discharging after the third solid phase reaches the standard.
And fully stirring and cleaning the second solid phase and water, removing the residual gel breaking viscosity reducer and cleaning agent, standing, precipitating and layering the stirred liquid and sediment, and skimming the supernatant on the upper part to obtain a precipitated solid, namely a third solid phase. The pH value of the cleaned third solid phase is between 6 and 8, and the third solid phase does not form secondary pollution within the range of environmental protection requirements, thereby being beneficial to the subsequent use of a microorganism treatment method and achieving higher requirement standards.
The third solid phase reaches the standard, namely the oil content of the third solid phase is less than 2%, or the third solid phase meets the requirements of regional governments. The third solid phase discharge can be used for well site padding, oil laying and road construction, resource utilization brick making and the like.
It should be noted that the supernatant in steps S1, S2 and S3 can be recycled, so as to save energy and reduce cost.
Preferably, the temperature of the water is 70-90 ℃.
To explore the appropriate temperature of water, the following experiments were performed.
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of water at 30 ℃, 50 ℃, 70 ℃, 80 ℃, 90 ℃ or 98 ℃ and 6g of citric acid, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant and oil; 2, adding 200g of hot water at 30 ℃, 50 ℃, 70 ℃, 80 ℃, 90 ℃ or 98 ℃ and 6g of LAS-80R sodium dodecyl benzene sulfonate, stirring for 15 minutes, standing for 30 minutes, and pouring out supernatant and oil; 3, adding 800g of hot water with the temperature of 40-60 ℃, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant; 4, the solid phase in the cup was taken and the oil, water, and solids content were determined using ZNG-2A (450 ℃ C.) and the results are shown in Table 1:
TABLE 1
Wherein, the oil content is calculated as follows:
oil quality measured (%)/(measured oil quality + measured solid phase quality) of the rock debris after washing)
As can be seen from the results in Table 1, the oil content generally tends to decrease as the temperature increases. When the temperature rises to above 70 ℃, the oil content is controlled below 2 percent. When the temperature reached 98 ℃, the tendency of reduction of the oil content was not significant. Therefore, the water temperature can be controlled between 70 ℃ and 90 ℃, so that a solid phase with low oil content can be obtained, and energy is saved.
Preferably, the stirring speed is 800rpm and the stirring time is 15 min.
To explore the appropriate stirring time, the following experiments were performed.
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of hot water with the temperature of 80 ℃ and 6g of citric acid, stirring for 10, 15 or 30 minutes, standing for 15 minutes, and pouring out supernatant and oil; 2, adding 200g of hot water with the temperature of 80 ℃ and 6g of LAS dodecyl benzene sodium sulfonate, stirring for 10, 15 or 30 minutes, standing for 30 minutes, and discharging supernatant and oil; 3, adding 800g of hot water with the temperature of 80 ℃, stirring for 10, 15 or 30 minutes, standing for 15 minutes, and pouring out supernatant; 4, taking the solid phase in the cup, and measuring the solid content of oil, water and solid content by using ZNG-2A (450 ℃). Wherein, the drill cuttings can be fully stirred by selecting a medium-speed stirrer with the stirring speed of 800rpm and the distance between the blades of the stirrer and the cup bottom of 2-3 mm. The results are shown in table 2:
TABLE 2
Wherein, the oil content is calculated as follows:
oil quality measured (%)/(measured oil quality + measured solid phase quality) of the rock debris after washing)
As can be seen from the results in Table 2, when the stirring time reached 15min, the oil content in the solid phase in the cup had been greatly reduced. Therefore, when the stirring speed is 800rpm, the stirring time is 15min, so that the water and the oil-based drilling cuttings can be fully and uniformly mixed, and the purposes of fully breaking the rubber and cleaning are achieved.
Optionally, the weight of the gel breaking viscosity reducer is 2.7-4% of the weight of the oil-based drill cuttings. A large number of practices prove that when the weight of the gel breaking viscosity reducer is 2.7-4% of that of the oil-based drilling cuttings, the organic acid dissolved in water and calcium ions in the oil-based drilling cuttings can be fully reacted to generate organic calcium precipitates, more calcium ions in the oil-based drilling cuttings are removed, the colloid stability of the oil-based drilling cuttings is better damaged, the viscosity is greatly reduced, the contact surface between the drilling cuttings and water is increased to the maximum extent, and the cleaning of the oil-based drilling cuttings is facilitated.
Optionally, the weight of the cleaner is 2.7-3.5% of the weight of the oil-based drill cuttings. A large number of practices prove that when the weight of the cleaning agent is 2.7-3.5% of the weight of the oil-based drill cuttings, the oil in the oil-based drill cuttings can be sufficiently cleaned and removed, and the oil content of the oil-based drill cuttings is reduced.
Optionally, in step S1, the weight ratio of the water to the oil-based drill cuttings is 1: 1; in step S2, the weight ratio of the water to the oil-based drill cuttings is 1: 1; in step S3, the weight ratio of the water to the oil-based drill cuttings is 4: 1. A large number of practices prove that the oil-based drilling cutting fluid is beneficial to full contact of the gel breaking viscosity reducer and the cleaning agent with the oil-based drilling cuttings, and the purposes of full gel breaking and cleaning are achieved. In the step S3, the weight ratio of water to the oil-based drill cuttings is 4:1, so that the gel breaking viscosity reducer and the cleaning agent in the oil-based drill cuttings can be sufficiently removed, the pH value of the cleaned third solid phase is 6-8, and the pH value is within the environmental protection requirement range.
For further explanation of the present application, the following examples are provided to describe the formulation of the oil-based drill cuttings hot washing treatment agent and the low-temperature hot washing treatment method in detail, but they should not be construed as limiting the scope of the present application.
Example 1
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of hot water at the temperature of 70-80 ℃ and 6g of citric acid, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant to obtain a first solid phase; adding 200g of hot water with the temperature of 70-80 ℃ and 6g of LAS-80R sodium dodecyl benzene sulfonate, stirring for 15 minutes, standing for 30 minutes, and pouring out supernatant to obtain a second solid phase; adding 800g of hot water of 70-80 deg.C, stirring for 15min, standing for 15min, collecting supernatant, collecting solid phase (third solid phase) in cup, measuring oil, water and solid content with ZNG-2A (450 deg.C), and measuring oil content with TD 500D. Wherein, a medium speed stirrer was selected, and the result of stirring speed 800rpm is shown in Table 3.
Example 2
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of hot water at the temperature of 80-90 ℃ and 6g of citric acid, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant and oil to obtain a first solid phase; adding 200g of hot water with the temperature of 80-90 ℃ and 6g of LAS-80R sodium dodecyl benzene sulfonate, stirring for 15 minutes, standing for 30 minutes, and pouring out supernatant and oil to obtain a second solid phase; adding 80-90 deg.C hot water 800g, stirring for 15min, standing for 15min, collecting supernatant, collecting solid phase (third solid phase) in cup, measuring oil, water and solid content with ZNG-2A (450 deg.C), and measuring oil content with TD 500D. Wherein, a medium-speed stirrer is selected, and the stirring speed is 800 rpm. The results are shown in Table 3.
TABLE 3
Wherein, the oil content is calculated as follows:
oil quality measured (%)/(measured oil quality + measured solid phase quality) of the rock debris after washing)
Example 3
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of hot water with the temperature of 80 ℃ and 8g of citric acid, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant and oil to obtain a first solid phase; adding 200g of hot water with the temperature of 80 ℃ and 6g of LAS sodium dodecyl benzene sulfonate, stirring for 15 minutes, standing for 30 minutes, and pouring out supernatant and oil to obtain a second solid phase; 800g of hot water at 80 ℃ was added, the mixture was stirred for 15 minutes, the mixture was allowed to stand for 15 minutes, the supernatant was decanted, the solid phase (third solid phase) in the cup was taken, and the oil, water and solid contents were measured by ZNG-2A (450 ℃). Wherein, a medium-speed stirrer is selected, and the stirring speed is 800 rpm. The results are shown in Table 4.
Example 4
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of hot water at 80 ℃ and 6g of malic acid, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant and oil to obtain a first solid phase; adding 200g of hot water with the temperature of 80 ℃ and 6g of LAS-80R sodium dodecyl benzene sulfonate, stirring for 15 minutes, standing for 30 minutes, and pouring out supernatant and oil to obtain a second solid phase; 800g of hot water at 80 ℃ was added, the mixture was stirred for 15 minutes, the mixture was allowed to stand for 15 minutes, the supernatant was decanted, the solid phase (third solid phase) in the cup was taken, and the oil, water and solid contents were measured by ZNG-2A (450 ℃). Wherein, a medium-speed stirrer is selected, and the stirring speed is 800 rpm. The results are shown in Table 4.
Example 5
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of hot water at 80 ℃ and 6g of salicylic acid, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant and oil to obtain a first solid phase; adding 200g of hot water with the temperature of 80 ℃ and 6g of LAS-80R sodium dodecyl benzene sulfonate, stirring for 15 minutes, standing for 30 minutes, and pouring out supernatant and oil to obtain a second solid phase; 800g of hot water at 80 ℃ was added, the mixture was stirred for 15 minutes, the mixture was allowed to stand for 15 minutes, the supernatant was decanted, the solid phase (third solid phase) in the cup was taken, and the oil, water and solid contents were measured by ZNG-2A (450 ℃). Wherein, a medium-speed stirrer is selected, and the stirring speed is 800 rpm. The results are shown in Table 4.
Example 6
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of hot water at 80 ℃ and 6g of oxalic acid, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant and oil to obtain a first solid phase; adding 200g of hot water with the temperature of 80 ℃ and 6g of LAS-80R sodium dodecyl benzene sulfonate, stirring for 15 minutes, standing for 30 minutes, and pouring out supernatant and oil to obtain a second solid phase; 800g of hot water at 80 ℃ was added, the mixture was stirred for 15 minutes, the mixture was allowed to stand for 15 minutes, the supernatant was decanted, the solid phase (third solid phase) in the cup was taken, and the oil, water and solid contents were measured by ZNG-2A (450 ℃). Wherein, a medium-speed stirrer is selected, and the stirring speed is 800 rpm. The results are shown in Table 4.
Example 7
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of hot water with the temperature of 80 ℃ and 6g of tartaric acid, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant and oil to obtain a first solid phase; adding 200g of hot water with the temperature of 80 ℃ and 6g of LAS-80R sodium dodecyl benzene sulfonate, stirring for 15 minutes, standing for 30 minutes, and pouring out supernatant and oil to obtain a second solid phase; 800g of hot water at 80 ℃ was added, the mixture was stirred for 15 minutes, the mixture was allowed to stand for 15 minutes, the supernatant was decanted, the solid phase (third solid phase) in the cup was taken, and the oil, water and solid contents were measured by ZNG-2A (450 ℃). Wherein, a medium-speed stirrer is selected, and the stirring speed is 800 rpm. The results are shown in Table 4.
Example 8
Putting 200g of oil-based drilling cuttings into a beaker, adding 200g of hot water at 80 ℃, 2g of oxalic acid, 4g of citric acid and 2g of malic acid, stirring for 15 minutes, standing for 15 minutes, and pouring out supernatant and oil to obtain a first solid phase; adding 200g of hot water with the temperature of 80 ℃ and 6g of LAS-80R sodium dodecyl benzene sulfonate, stirring for 15 minutes, standing for 30 minutes, and pouring out supernatant and oil to obtain a second solid phase; 800g of hot water at 80 ℃ was added, the mixture was stirred for 15 minutes, the mixture was allowed to stand for 15 minutes, the supernatant was decanted, the solid phase (third solid phase) in the cup was taken, and the oil, water and solid contents were measured by ZNG-2A (450 ℃). Wherein, a medium-speed stirrer is selected, and the stirring speed is 800 rpm. The results are shown in Table 4.
TABLE 4
Wherein, the oil content is calculated as follows:
oil quality measured (%)/(measured oil quality + measured solid phase quality) of the rock debris after washing)
According to the technical scheme, the oil-based drilling cutting hot washing treatment agent formula and the low-temperature hot washing treatment method are provided in the embodiment of the application. The treating agent comprises a gel breaking viscosity reducer and a cleaning agent; the gel breaking and viscosity reducing agent comprises a low-carbon chain organic acid, wherein the low-carbon chain organic acid is an organic acid with the carbon atom number of 2-7; the cleaning agent comprises LAS type sodium dodecyl benzene sulfonate. The low-temperature hot washing treatment method comprises the following steps: mixing and stirring the oil-based drilling cuttings, water and the gel breaking viscosity reducer, standing, and skimming supernatant and oil to obtain a first solid phase; fully mixing and stirring the first solid phase, water and a cleaning agent, standing, and skimming supernatant and oil to obtain a second solid phase; and fully stirring and cleaning the second solid phase and water, standing, and skimming a supernatant to obtain a third solid phase. The gel breaking viscosity reducer and the cleaning agent used in the application are environment-friendly materials, the gel breaking viscosity reducer is formed by reacting organic acid capable of being dissolved in water with calcium ions in the oil-based drilling cuttings to generate organic acid calcium precipitates, the calcium ions in the oil-based drilling cuttings are removed, the colloidal stability of the oil-based drilling cuttings is damaged, the pH value is reduced, emulsion is made to lose stability, gel breaking is carried out, the viscosity is greatly reduced, the contact surface of the drilling cuttings and water is increased to the maximum extent, and the cleaning of the oil-based drilling cuttings is facilitated. The pH value after cleaning is between 6 and 8 and is within the range of environmental protection requirements. The production process is simple, secondary pollution is avoided, the subsequent microbial treatment method is facilitated, and higher requirement standards are met.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (2)
1. The low-temperature hot washing treatment method for the oil-based drill cuttings is characterized by comprising the following steps:
step S1, mixing and stirring the oil-based drilling cuttings, the water and the gel breaking and viscosity reducing agent, and removing supernatant and oil after standing to obtain a first solid phase;
step S2, fully mixing and stirring the first solid phase, water and the cleaning agent, and removing supernatant and oil after standing to obtain a second solid phase;
step S3, fully stirring and cleaning the second solid phase and water, standing, removing supernatant to obtain a third solid phase, and discharging the third solid phase after reaching the standard;
the gel breaking and viscosity reducing agent is low-carbon chain organic acid, and the low-carbon chain organic acid is at least one of oxalic acid, tartaric acid, malic acid, citric acid and salicylic acid; the cleaning agent is straight-chain sodium dodecyl benzene sulfonate, the temperature of water is 80-90 ℃, the stirring speed is 800rpm, the stirring time is 15min, the weight of the gel breaking viscosity reducer is 4% of that of the oil-based drill cuttings, and the weight of the cleaning agent is 2.7-3.5% of that of the oil-based drill cuttings.
2. The low-temperature hot washing treatment method for the oil-based drill cuttings according to claim 1, wherein in step S1, the weight ratio of the water to the oil-based drill cuttings is 1: 1; in step S2, the weight ratio of the water to the oil-based drill cuttings is 1: 1; in step S3, the weight ratio of the water to the oil-based drill cuttings is 4: 1.
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