CN111826134A - Biomass fermentation broth lubricant for drilling fluid and preparation method thereof - Google Patents
Biomass fermentation broth lubricant for drilling fluid and preparation method thereof Download PDFInfo
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- CN111826134A CN111826134A CN201910317463.3A CN201910317463A CN111826134A CN 111826134 A CN111826134 A CN 111826134A CN 201910317463 A CN201910317463 A CN 201910317463A CN 111826134 A CN111826134 A CN 111826134A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
Abstract
The invention provides a biomass fermentation liquid lubricant for drilling fluid, which is prepared from the following materials in parts by weight: 75-90 parts of biomass fermentation liquor; 8-12 parts of a thickening agent; 3-5 parts of an emulsifier; the preparation method of the biomass fermentation liquor comprises the following steps: carrying out centrifugal separation on the microbial fermentation liquor to remove impurities, and obtaining upper-layer liquid after centrifugal separation; carrying out esterification reaction on the upper layer liquid and lower alcohol under the action of a catalyst to obtain a biomass fermentation crude solution; and settling the crude biomass fermentation solution to obtain a water phase and an oil phase, wherein the oil phase is a biomass fermentation liquid. The biomass fermentation liquid lubricant for the drilling fluid provided by the invention is low in price, easy to biodegrade, green and pollution-free, and is suitable for operations of extended reach wells, inclined wells, horizontal wells and the like.
Description
Technical Field
The invention relates to the technical field of oil and gas well exploitation, in particular to a biomass fermentation liquid lubricant for drilling fluid and a preparation method thereof.
Background
In the oil and gas well drilling process, the lubricant is an important drilling fluid additive, and has the functions of reducing the frictional resistance between a drilling tool and the well wall and between the drilling tool and a casing pipe, and reducing the rotation torque and the tripping resistance of a drill string, so that the underground drilling sticking accidents are reduced, and the well drilling speed is improved.
The existing widely used lubricant for drilling fluid has high cost, pollutes the environment or has fluorescence influence on geological logging, and cannot well meet the requirements of large-scale horizontal well exploration and development on the cost and performance of the lubricant for drilling fluid.
Disclosure of Invention
In view of the above, the invention aims to provide a biomass fermentation broth lubricant for a drilling fluid, which has good dispersing and lubricating properties, and has the advantages of low fluorescence, environmental friendliness, easy biodegradation and good compatibility with a drilling fluid system.
The invention provides a biomass fermentation liquid lubricant for drilling fluid, which is prepared from the following materials in parts by weight:
75-90 parts of biomass fermentation liquor;
8-12 parts of a thickening agent;
3-5 parts of an emulsifier.
In the invention, the preparation method of the biomass fermentation liquor comprises the following steps:
carrying out centrifugal separation on the microbial fermentation liquor to remove impurities, and obtaining upper-layer liquid after centrifugal separation;
carrying out esterification reaction on the upper layer liquid and lower alcohol under the action of a catalyst to obtain a biomass fermentation crude solution;
and settling the crude biomass fermentation solution to obtain a water phase and an oil phase, wherein the oil phase is a biomass fermentation liquid.
In the invention, the microorganism fermentation liquor is preferably one or more of feed fermentation liquor, plant straw fermentation liquor, beer fermentation liquor, protease fermentation liquor and molasses fermentation liquor. The source of the microbial fermentation liquid is not particularly limited, and the microbial fermentation liquid is prepared by a microbial fermentation method known to a person skilled in the art or obtained by market purchase, for example, molasses fermentation liquid provided by Jinxin chemical industry Co., Ltd.
In the invention, the speed of centrifugal separation is preferably 2000-5000 r/min, more preferably 2500-4500 r/min, and most preferably 3000-4000 r/min; the time for centrifugal separation is preferably 5-15 min, more preferably 8-12 min, and most preferably 10 min.
In the invention, the catalyst is preferably one or more of p-methyl benzene sulfonic acid, thionyl chloride and tetrabutyl titanate.
In the present invention, the lower alcohol is preferably one or more of methanol, ethanol and butanol.
In the invention, the mass ratio of the upper layer liquid, the lower alcohol and the catalyst is preferably (8-10): (3-5): (2-3); more preferably (8.5-9.5): (3.5-4.5): (2.2-2.8), most preferably 9: 4: (2.4-2.6).
In the invention, the temperature of the esterification reaction is preferably 50-70 ℃, more preferably 55-65 ℃, and most preferably 60 ℃. In the invention, the esterification reaction time is preferably 2-5 h, and more preferably 3-4 h. In the present invention, the esterification reaction is preferably carried out under stirring; the stirring speed is preferably 200-400 r/min, more preferably 250-350 r/min, and most preferably 300 r/min.
In the invention, the settling method is preferably natural settling, so that the biomass fermentation crude solution is divided into two layers, wherein the lower layer is a water phase, and the upper layer is an oil phase.
The reaction temperature and the catalyst selection are more critical in the process of preparing the biomass fermentation liquor, the reaction temperature influences the reaction completion degree of the biomass fermentation liquor, and the dosage of the catalyst influences the state of the biomass fermentation liquor.
In the invention, the weight part of the biomass fermentation liquid is preferably 75-85 parts, more preferably 78-83 parts, and most preferably 80 parts.
In the invention, the weight part of the thickener is preferably 8.5-11 parts, more preferably 9-10.5 parts, and most preferably 10 parts. In the invention, the thickener is preferably one or more of barium stearate, potassium oleate, sodium stearate and calcium stearate.
In the invention, the weight part of the emulsifier is preferably 3.5-4.5 parts, more preferably 3.8-4.2 parts, and most preferably 4 parts. In the invention, the emulsifier is preferably one or more of fatty acid polyoxyethylene ester, fatty amine polyoxyethylene ether, alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.
The invention provides a preparation method of a biomass fermentation liquid lubricant for drilling fluid, which comprises the following steps:
and mixing the biomass fermentation liquor, the thickening agent and the emulsifier to obtain the biomass fermentation liquor lubricant for the drilling fluid.
In the invention, the types and the amounts of the biomass fermentation liquid, the thickening agent and the emulsifying agent are the same as those of the biomass fermentation liquid, the thickening agent and the emulsifying agent in the technical scheme, and are not described again.
In the invention, the mixing temperature is preferably 50-70 ℃, more preferably 55-65 ℃, and most preferably 60 ℃; the mixing time is preferably 2-4 h, more preferably 2.5-3.5 h, and most preferably 3 h; the mixing is preferably carried out under the condition of stirring, and the stirring speed is preferably 300-500 r/min, more preferably 350-450 r/min, and most preferably 400 r/min.
The lubricant disclosed by the invention has good dispersing and lubricating properties in a drilling fluid system, and has the advantages of low fluorescence, environmental friendliness, easiness in biodegradation, good compatibility with the drilling fluid system and the like; the lubricant has the advantages of low cost, cheap and easily-obtained raw materials mainly derived from biomass fermentation waste liquid, simple production process and wide applicability.
Compared with the prior art, the biomass fermentation liquid lubricant for the drilling fluid provided by the invention uses the microbial fermentation waste liquid as the raw material, prepares the biomass fermentation liquid after chemical reaction, and has the advantages of wide raw material source, low price and environmental protection; the lubricating coefficient in fresh water slurry is more than or equal to 88 percent, the lubricating coefficient in 4 percent saline slurry is more than or equal to 75 percent, and the lubricating coefficient in saturated saline slurry is more than or equal to 70 percent; when the addition amount of the foaming agent in the base slurry is 1%, the change of the apparent viscosity is small, and the foaming rate is less than 4%; the drilling fluid has good compatibility in water-based drilling fluid, does not foam and tackify when added into the drilling fluid, has no obvious influence on the rheological property of the drilling fluid, and plays a vital role in reducing the complex conditions under the well such as sticking and the like and ensuring safe, high-quality and rapid drilling.
The biomass fermentation liquid lubricant for the drilling fluid provided by the invention has no corrosion to metals, no pollution to the environment, no influence on analysis and evaluation of stratum data, low fluorescence and a fluorescence level of less than or equal to 3. After the biomass fermentation liquid lubricant provided by the invention is added into drilling fluid, the filtration loss of the lubricant is basically unchanged, and the lubricant plays an important role in stabilizing a well wall. The biomass fermentation liquid lubricant for the drilling fluid provided by the invention is green and nontoxic, is low in price, and is simple, quick and efficient in preparation method.
The biomass fermentation liquid lubricant for the drilling fluid provided by the invention has the characteristics of greenness, saturated salt resistance, no foaming and viscosity increase when the drilling fluid is added, no obvious influence on the rheological property of the drilling fluid and the like, and is suitable for drilling fluids of well types such as vertical wells, inclined wells, horizontal wells and the like, and drilling fluids of fresh water, seawater and saturated salt water systems.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention.
The raw materials used in the following examples of the present invention are all commercially available products, and the used microbial fermentation broth is molasses fermentation broth provided by Jinan Xin Yao chemical Co., Ltd.
Example 1
Taking the microbial fermentation liquor, centrifuging at a high speed of 3000r/min for 15min to remove impurities, and taking the centrifuged upper-layer homogeneous liquid for later use; putting 8 parts by weight of the prepared upper-layer homogeneous liquid into a reaction vessel, then sequentially adding 3 parts by weight of methanol and 2 parts by weight of p-toluenesulfonic acid into the reaction vessel, and carrying out esterification reaction for 5 hours at 70 ℃ and 400r/min to obtain a biomass fermentation crude solution; and naturally settling the crude biomass fermentation solution, and dividing the crude biomass fermentation solution into two layers, wherein the lower layer is a water phase, and the upper oil phase is the biomass fermentation liquid.
75 parts by weight of biomass fermentation liquor; 8 parts by weight of potassium oleate; adding 3 parts by weight of alkylphenol polyoxyethylene into a reaction kettle, and reacting for 4 hours at 70 ℃ at 500r/min to obtain the biomass fermentation liquid lubricant for the drilling fluid.
Example 2
80 parts by weight of the biomass fermentation broth prepared in example 1; 9 parts by weight of potassium oleate; adding 4 parts by weight of alkylphenol polyoxyethylene into a reaction kettle, and reacting for 3 hours at 70 ℃ at 450r/min to prepare the biomass fermentation liquid lubricant for the drilling fluid.
Example 3
85 parts by weight of the biomass fermentation broth prepared in example 1; 10 parts by weight of potassium oleate; adding 5 parts by weight of alkylphenol polyoxyethylene into a reaction kettle, and reacting for 3 hours at 65 ℃ at 400r/min to prepare the biomass fermentation liquid lubricant for the drilling fluid.
Example 4
90 parts by weight of the biomass fermentation broth prepared in example 1; 11 parts by weight of potassium oleate; adding 4 parts by weight of alkylphenol polyoxyethylene into a reaction kettle, and reacting for 2 hours at 60 ℃ at 350r/min to prepare the biomass fermentation liquid lubricant for the drilling fluid.
Example 5
85 parts by weight of the biomass fermentation broth prepared in example 1; 11 parts by weight of potassium oleate; adding 4 parts by weight of alkylphenol polyoxyethylene into a reaction kettle, and reacting for 2 hours at 60 ℃ at 300r/min to prepare the biomass fermentation liquid lubricant for the drilling fluid.
Example 6
80 parts by weight of the biomass fermentation broth prepared in example 1; 10 parts by weight of potassium oleate; adding 4 parts by weight of alkylphenol polyoxyethylene into a reaction kettle, and reacting for 3 hours at the temperature of 60 ℃ and the speed of 400r/min to prepare the biomass fermentation liquid lubricant for the drilling fluid.
Example 7
Taking the microbial fermentation liquor, centrifuging at a high speed of 4000r/min for 10min to remove impurities, and taking the centrifuged upper-layer homogeneous liquid for later use; putting 9 parts by weight of the prepared upper-layer homogeneous liquid into a reaction vessel, then sequentially adding 4 parts of ethanol and 2.2 parts of thionyl chloride into the reaction vessel, and carrying out esterification reaction for 4 hours at 65 ℃ and 350r/min to prepare a biomass fermentation crude solution; and naturally settling the crude biomass fermentation solution, and dividing the crude biomass fermentation solution into two layers, wherein the lower layer is a water phase, and the upper oil phase is the biomass fermentation liquid.
A biomass broth lubricant was prepared according to the method of example 1, replacing the biomass broth of example 1 with the biomass broth of example 7.
Example 8
A biomass broth lubricant was prepared according to the method of example 2, replacing the biomass broth of example 2 with the biomass broth of example 7.
Example 9
A biomass broth lubricant was prepared according to the method of example 3, replacing the biomass broth of example 3 with the biomass broth of example 7.
Example 10
A biomass broth lubricant was prepared according to the method of example 4, replacing the biomass broth of example 4 with the biomass broth of example 7.
Example 11
A biomass broth lubricant was prepared according to the method of example 5, replacing the biomass broth of example 5 with the biomass broth of example 7.
Example 12
A biomass broth lubricant was prepared according to the method of example 6, replacing the biomass broth of example 6 with the biomass broth of example 7.
Example 13
Centrifuging the microorganism fermentation liquor at a high speed of 5000r/min for 5min to remove impurities, and collecting the centrifuged upper layer homogeneous liquid for later use; taking 10 parts by weight of the prepared upper-layer homogeneous liquid, placing the upper-layer homogeneous liquid into a reaction vessel, then sequentially adding 5 parts of butanol and 2.5 parts of tetrabutyl titanate into the reaction vessel, and carrying out esterification reaction for 3 hours at the temperature of 60 ℃ and at the speed of 300r/min to obtain a biomass fermentation crude solution; and naturally settling the crude biomass fermentation solution, and dividing the crude biomass fermentation solution into two layers, wherein the lower layer is a water phase, and the upper oil phase is the biomass fermentation liquid.
A biomass fermentation broth lubricant was prepared according to the method of example 1, replacing the biomass fermentation broth of example 1 with the biomass fermentation broth of example 13.
Example 14
A biomass broth lubricant was prepared according to the method of example 2, replacing the biomass broth of example 2 with the biomass broth of example 13.
Example 15
A biomass broth lubricant was prepared according to the method of example 3, replacing the biomass broth of example 3 with the biomass broth of example 13.
Example 16
A biomass broth lubricant was prepared according to the method of example 4, replacing the biomass broth of example 4 with the biomass broth of example 13.
Example 17
A biomass broth lubricant was prepared according to the method of example 5, replacing the biomass broth of example 5 with the biomass broth of example 13.
Example 18
A biomass broth lubricant was prepared according to the method of example 6, replacing the biomass broth of example 6 with the biomass broth of example 13.
Example 19
Centrifuging the microorganism fermentation liquor at 3500r/min for 8min to remove impurities, and collecting the centrifuged upper layer homogeneous liquid; putting 8 parts by weight of the prepared upper-layer homogeneous liquid into a reaction vessel, then sequentially adding 4 parts of methanol and 2.8 parts of thionyl chloride into the reaction vessel, and carrying out esterification reaction for 2 hours at the temperature of 55 ℃ and at the speed of 250r/min to prepare a biomass fermentation crude solution; and naturally settling the crude biomass fermentation solution, and dividing the crude biomass fermentation solution into two layers, wherein the lower layer is a water phase, and the upper oil phase is the biomass fermentation liquid.
A biomass broth lubricant was prepared according to the method of example 1, replacing the biomass broth of example 1 with the biomass broth of example 19.
Example 20
A biomass broth lubricant was prepared according to the method of example 2, replacing the biomass broth of example 2 with the biomass broth of example 19.
Example 21
A biomass broth lubricant was prepared according to the method of example 3, replacing the biomass broth of example 3 with the biomass broth of example 19.
Example 22
A biomass broth lubricant was prepared according to the method of example 4, replacing the biomass broth of example 4 with the biomass broth of example 19.
Example 23
A biomass broth lubricant was prepared according to the method of example 5, replacing the biomass broth of example 5 with the biomass broth of example 19.
Example 24
A biomass broth lubricant was prepared according to the method of example 6, replacing the biomass broth of example 6 with the biomass broth of example 19.
Example 25
Centrifuging the microorganism fermentation liquor at 3500r/min for 10min to remove impurities, and collecting the centrifuged upper layer homogeneous liquid; placing 9 parts by weight of the prepared upper-layer homogeneous liquid into a reaction vessel, sequentially adding 4 parts by weight of ethanol and 2.5 parts by weight of p-toluenesulfonic acid into the reaction vessel, and performing esterification reaction for 4 hours at the temperature of 60 ℃ and at the speed of 300r/min to prepare a biomass fermentation crude solution; and naturally settling the crude biomass fermentation solution, and dividing the crude biomass fermentation solution into two layers, wherein the lower layer is a water phase, and the upper oil phase is the biomass fermentation liquid.
A biomass fermentation broth lubricant was prepared according to the method of example 1, replacing the biomass fermentation broth of example 1 with the biomass fermentation broth of example 25.
Example 26
A biomass broth lubricant was prepared according to the method of example 2, replacing the biomass broth of example 2 with the biomass broth of example 25.
Example 27
A biomass broth lubricant was prepared according to the method of example 3, replacing the biomass broth of example 3 with the biomass broth of example 25.
Example 28
A biomass broth lubricant was prepared according to the method of example 4, replacing the biomass broth of example 4 with the biomass broth of example 25.
Example 29
A biomass broth lubricant was prepared according to the method of example 5, replacing the biomass broth of example 5 with the biomass broth of example 25.
Example 30
A biomass broth lubricant was prepared according to the method of example 6, replacing the biomass broth of example 6 with the biomass broth of example 25.
Example 31 lubricating Properties
The extreme pressure lubrication coefficient is tested by adopting an OFI112-00-1 digital extreme pressure lubrication instrument.
The operation steps are as follows: firstly, checking the machine by using purified water, wherein the torque reading is 0 when the machine is not pressurized, and the rotating speed is 60 rpm; the rotation speed was maintained at 60rpm when the pressure was increased to 150inch pounds (inch-pounds); and then, operating the device for 5min under the condition of pressurizing to 150 inch-points, and testing the torque reading of the purified water to ensure that the torque reading of the purified water is between 28 and 42. The purified water was changed to the slurry to be tested and run under pressure of 150 inch-pots for 5min, and the torque reading of the tested slurry was read. Before testing the torque of the slurry, the machine is checked by pure water.
The extreme pressure lubrication coefficient reduction rate calculation formula is as follows:
reduction rate of extreme pressure lubrication coefficient ═ KBase of/KWater (W)–KLubricating device/K*Water (W))/(KBase of/KWater (W))×100％，
In the formula:
Kbase of: reading the extreme pressure torque of the drilling fluid without adding the biomass fermentation liquid lubricant;
Klubricating device: the drilling fluid extreme pressure torque reading value added with the biomass fermentation liquid lubricant;
Kwater (W): measuring the read value of the extreme pressure torque of the purified water before measuring the drilling fluid without adding the biomass fermentation liquid lubricant;
K*water (W): and measuring the read value of the extreme pressure torque of the purified water before the drilling fluid added with the biomass fermentation liquid lubricant is measured.
Adding 400mL of prepared fresh water base slurry into 0# and 1# to 30# high-stirring cups respectively, adding 4g of the biomass fermentation liquid lubricant provided by the embodiments 1 to 30# into 1# to 30# high-stirring cup base slurry respectively, stirring for 5min at high speed, and pouring into 0# and 1# to 30# aging tanks; and hot rolling the aging tank in a roller heating furnace at 110 ℃ for 16h, taking out, cooling to room temperature, stirring for 5min, and measuring the lubricating coefficient. Test results the rate of reduction of the lubricity coefficient in the fresh water slurry is shown in table 1.
Adding 400mL of prepared fresh water base slurry into 0# and 1# to 30# high-stirring cups respectively, adding 16g of NaCl into the 0# and 1# to 30# high-stirring cups, adding 4g of the biomass fermentation liquid lubricant provided by the embodiments 1 to 30 into the 1# to 30# high-stirring cup base slurry respectively, stirring for 5min at high speed, and pouring into 0# and 1# to 30# aging tanks; and hot rolling the aging tank in a roller heating furnace at 110 ℃ for 16h, taking out, cooling to room temperature, stirring for 5min, and measuring the lubricating coefficient. Test results the rate of reduction of the lubricity coefficient in the 4% saline slurry is shown in table 1.
Adding 400mL of prepared fresh water base slurry into 0# and 1# to 30# high-stirring cups respectively, adding 144g of NaCl into the 0# and 1# to 30# high-stirring cups, adding 4g of the biomass fermentation liquid lubricant provided by the embodiments 1 to 30 into the 1# to 30# high-stirring cup base slurry respectively, stirring for 5min at high speed, and pouring into 0# and 1# to 30# aging tanks; and hot rolling the aging tank in a roller heating furnace at 110 ℃ for 16h, taking out, cooling to room temperature, stirring for 5min, and measuring the lubricating coefficient. Test results the rate of reduction of the lubricity coefficient in the saturated brine slurry is shown in table 1.
In the above test, the preparation method of the fresh water-based slurry specifically comprises: respectively adding 400mL of distilled water, 0.8g of anhydrous sodium carbonate and 20g of sodium bentonite into a high-stirring cup, stirring for 20min, at least cutting off twice during the stirring to scrape off adherends adhered to the cup wall, sealing and maintaining for 24h at 25 +/-1 ℃ to ensure that the apparent viscosity reaches 13-15 mpa-s, and if the addition of the bentonite cannot be properly adjusted.
TABLE 1 lubricating properties of Biomass fermentation broth lubricants prepared in accordance with the present examples
As can be seen from table 1, the fresh water base slurry lubrication coefficient reduction rate of the biomass fermentation broth lubricant provided in embodiments 1 to 30 of the present invention is greater than 88%, the 4% saline slurry lubrication coefficient reduction rate is greater than 75%, and the saturated saline lubrication coefficient reduction rate is greater than 70% at a high temperature of 110 ℃, which indicates that the biomass fermentation broth lubricant provided in the present invention has good lubrication performance.
Example 32 Effect of Biomass fermentation broth Lubricant on base stock Performance
Fluorescence level
The biomass fermentation liquid lubricant provided by the embodiment 1-30 of the invention is subjected to fluorescence level test, 20mL of trichloromethane is added into a clean and dried 100mL beaker, 1g of the biomass fermentation liquid lubricant provided by the embodiment 1-30 of which the fluorescence level needs to be measured is added respectively, the mixture is shaken up, placed and clarified, 10-15 mL of clarified liquid is poured out into a clean test tube, and the fluorescence level is determined by comparing the fluorescence with a related standard series under a geological fluorescence instrument.
Apparent viscosity and fluid loss
After the biomass fermentation liquid lubricant provided by the embodiments 1 to 30 of the invention is added into the drilling fluid, the apparent viscosity and the filtration loss of the drilling fluid are tested, fresh water base slurry 400mL is respectively measured and put into a number 1# to 6# high stirring cup, the number 1# high stirring cup, the number 3# high stirring cup and the number 5# high stirring cup are respectively added with 4g of the biomass fermentation liquid lubricant provided by the embodiments 1 to 30, the high stirring cup is added for 5min, and the 600 rotation reading and the low-temperature low-pressure filtration loss of the number 1# to 6# slurry are tested. The preparation method of the fresh water base slurry is the same as that of the fresh water base slurry when the lubrication coefficient is tested.
Foaming ratio
The biomass fermentation liquid lubricant provided by the embodiments 1-30 of the invention is subjected to foaming rate test, 400mL of the well-maintained fresh water base slurry is respectively taken into a 1# -30 # high-stirring cup, 4g of the biomass fermentation liquid lubricant provided by the embodiments 1-30 is respectively added, high stirring is carried out for 5min, timing is started after stirring is stopped, the slurry is poured into a 1000mL measuring cylinder within 20s, the volume is read within 30s, and the foaming rate is calculated. The preparation method of the fresh water base slurry is the same as that of the fresh water base slurry when the lubrication coefficient is tested.
Biotoxicity
The biomass fermentation broth lubricant provided by the embodiments 1-30 of the invention is subjected to biotoxicity test by using a luminescent bacteria method, and the test method is as follows:
firstly, living thingsPreparing a mass fermentation liquid lubricant into 200mL of 50000mg/L solution by using 3% sodium chloride solution, stirring at the rotating speed of 12000r/min for 30min to fully dissolve a sample, preparing 10mL of each of the to-be-detected biomass fermentation liquid lubricant sample solutions of 0, 10000mg/L, 25000mg/L, 50000mg/L, 100000mg/L and 200000mg/L by using the solution, and standing for 60 min; then, adding 10mg of luminous bacterium T3 powder into the diluted solution in sequence, shaking and mixing uniformly, respectively measuring by using 3% sodium chloride solution as comparison, and measuring relative luminous value EC of luminous bacterium after the luminous bacterium is contacted with the sample for 15min50(15min) was determined experimentally.
The results of the above performance tests are shown in table 2.
TABLE 2 Effect of Biomass fermentation broth lubricants on base stock Performance
As can be seen from Table 2, the foaming ratio of the biomass fermentation broth lubricant provided by the invention added into the base slurry is less than or equal to 4.0%, which shows that the biomass fermentation broth lubricant provided by the invention has good compatibility with water-based drilling fluid and basically does not foam.
The biomass fermentation broth lubricant provided by the invention has the characteristic of low fluorescence, the fluorescence level is less than or equal to 3, and the condition that no fluorescence interference exists after the biomass fermentation broth lubricant is added is shown, so that a reservoir stratum can be found in exploration.
After the biomass fermentation liquid lubricant provided by the embodiments 1 to 30 of the invention is added into the fresh water base slurry, the apparent viscosity of the fresh water base slurry is slightly reduced, so that the biomass fermentation liquid lubricant provided by the invention has no obvious influence on the rheological property of the drilling fluid.
After the biomass fermentation liquid lubricant provided by the embodiments 1-30 of the invention is added into the fresh water slurry, the filtration loss change is small, and the biomass fermentation liquid lubricant provided by the invention plays an important role in stabilizing the well wall.
The inventionEC of Biomass fermentation broth lubricant samples provided in examples 1-3050The value is more than or equal to 122000mg/L (far exceeds the non-toxic index 30000mg/L specified by national environmental protection), which indicates that the biomass fermentation liquid lubricant provided by the invention is green and non-toxic.
The biomass fermentation liquid lubricant for the drilling fluid provided by the invention has no corrosion to metals, no pollution to the environment, no influence on analysis and evaluation of stratum data, low fluorescence and a fluorescence level of less than or equal to 3. The biomass fermentation liquid lubricant for the drilling fluid provided by the invention has good stability in water-based drilling fluid, can obviously reduce the extreme pressure lubrication coefficient, and has the lubrication coefficient reduction rate of more than or equal to 88% in fresh water slurry, the lubrication coefficient reduction rate of more than or equal to 75% in 4% saline slurry and the lubrication coefficient reduction rate of more than or equal to 70% in saturated saline slurry; when the addition amount of the foaming agent in the base slurry is 1%, the change of the apparent viscosity is small, and the foaming rate is less than or equal to 4%; the drilling fluid has good compatibility in water-based drilling fluid, does not foam and tackify when added into the drilling fluid, has no obvious influence on the rheological property of the drilling fluid, and plays a vital role in reducing the underground complex conditions such as sticking and the like and ensuring safe, high-quality and rapid drilling; low fluorescence, the fluorescence level is less than or equal to 3; the biotoxicity is EC50Not less than 122000mg/L and good environmental protection.
The embodiment shows that the biomass fermentation broth lubricant for the drilling fluid is prepared from the following materials in parts by weight: 75-90 parts of biomass fermentation liquor; 8-12 parts of a thickening agent; 3-5 parts of an emulsifier; the preparation method of the biomass fermentation liquor comprises the following steps: carrying out centrifugal separation on the microbial fermentation liquor to remove impurities, and obtaining upper-layer liquid after centrifugal separation; carrying out esterification reaction on the upper layer liquid and lower alcohol under the action of a catalyst to obtain a biomass fermentation crude solution; and settling the crude biomass fermentation solution to obtain a water phase and an oil phase, wherein the oil phase is a biomass fermentation liquid. The biomass fermentation liquid lubricant for the drilling fluid provided by the invention is low in price, easy to biodegrade, green and pollution-free, and is suitable for operations of extended reach wells, inclined wells, horizontal wells and the like.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. The biomass fermentation liquid lubricant for the drilling fluid is prepared from the following materials in parts by weight:
75-90 parts of biomass fermentation liquor;
8-12 parts of a thickening agent;
3-5 parts of an emulsifier;
the preparation method of the biomass fermentation liquor comprises the following steps:
carrying out centrifugal separation on the microbial fermentation liquor to remove impurities, and obtaining upper-layer liquid after centrifugal separation;
carrying out esterification reaction on the upper layer liquid and lower alcohol under the action of a catalyst to obtain a biomass fermentation crude solution;
and settling the crude biomass fermentation solution to obtain a water phase and an oil phase, wherein the oil phase is a biomass fermentation liquid.
2. The biomass fermentation broth lubricant for drilling fluid as claimed in claim 1, wherein the microorganism fermentation broth is selected from one or more of feed fermentation broth, plant straw fermentation broth, beer fermentation broth, protease fermentation broth and molasses fermentation broth.
3. The biomass fermentation broth lubricant for drilling fluid as claimed in claim 1, wherein the catalyst is selected from one or more of p-methyl benzene sulfonic acid, thionyl chloride and tetrabutyl titanate.
4. The biomass fermentation broth lubricant for drilling fluid as claimed in claim 1, wherein the lower alcohol is selected from one or more of methanol, ethanol and butanol.
5. The biomass fermentation liquor lubricant for the drilling fluid as claimed in claim 1, wherein the mass ratio of the upper layer liquid to the lower alcohol to the catalyst is (8-10): (3-5): (2-3).
6. The biomass fermentation liquor lubricant for drilling fluid as claimed in claim 1, wherein the thickener is one or more selected from barium stearate, potassium oleate, sodium stearate and calcium stearate.
7. The biomass fermentation broth lubricant for drilling fluid as claimed in claim 1, wherein the emulsifier is selected from one or more of fatty acid polyoxyethylene ester, fatty amine polyoxyethylene ether, alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.
8. The preparation method of the biomass fermentation liquor lubricant for the drilling fluid, which comprises the following steps:
and mixing the biomass fermentation liquor, the thickening agent and the emulsifier to obtain the biomass fermentation liquor lubricant for the drilling fluid.
9. The method according to claim 8, wherein the temperature of the mixing is 50-70 ℃; the mixing time is 2-4 h.
10. The method according to claim 8, wherein the mixing is carried out under stirring at a speed of 300 to 500 r/min.
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