CN111057526B - Environment-friendly anti-sloughing drilling fluid and preparation method thereof - Google Patents
Environment-friendly anti-sloughing drilling fluid and preparation method thereof Download PDFInfo
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- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
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- 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
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
Abstract
The invention relates to an environment-friendly anti-sloughing drilling fluid and a preparation method thereof in the field of petroleum drilling fluids. The environment-friendly anti-sloughing drilling fluid comprises the following components in parts by weight: 100 parts by weight of water; 2-6 parts of sodium bentonite; 0.5-2 parts of anti-collapse starch; 0.3-0.8 part by weight of high-temperature resistant modified starch; 0.5 to 1 part by weight of polyanionic cellulose; 2-5 parts of humic acid fluid loss agent; 2-5 parts by weight of lignite resin; 0.2-0.5 part by weight of sodium sulfite; 2-6 parts by weight of calcium carbonate with the particle size of 40-70 microns; 5-10 parts by weight of calcium carbonate with the particle size of 10-30 microns. The environment-friendly anti-collapse drilling fluid is an environment-friendly anti-collapse drilling fluid system taking environment-friendly anti-collapse modified starch as a main agent, the prepared drilling fluid has good rheological property and water loss resistance effect after aging at the temperature of 150 ℃/16h, can be applied to high-temperature environment, has good anti-collapse performance and environmental protection property, can reduce environmental pollution to the maximum extent, and meets the requirements of drilling engineering on safety, high quality, rapidness and high efficiency.
Description
Technical Field
The invention relates to the field of drilling fluid in petroleum drilling, in particular to environment-friendly anti-sloughing drilling fluid and a preparation method thereof.
Background
Along with the increase of exploration strength of medium petrochemical industry in complex deep well areas with sensitive environment and the like, the requirements of environment-friendly, anti-collapse and high-temperature resistant drilling fluid are more and more extensive. In recent years, in a plurality of foreign service companies, Scomi company researches an Opt-flo drilling fluid which mainly inhibits plugging and prevents collapse of organic salts and has the application temperature of 130 ℃; in addition, Baroid of Halliburton company develops an N-Drilling fluid, a high-molecular coating material is taken as a main material, an inorganic salt is matched in the system to play a role in inhibiting and preventing collapse, and the application temperature is 140 ℃; the MI of Schlumberger develops Glydrill drilling fluid, which mainly utilizes the plugging and anti-collapse performance of alcohols to ensure that the system has better effect of stabilizing the well wall. The application temperature of the existing anti-collapse drilling fluid system at home and abroad is within 140 ℃, the drilling fluid can not meet the drilling requirement of partial deep wells, and in addition, the drilling fluid has high toxicity and serious environmental pollution, and can not meet the requirement of the medium and petrochemical industry on the exploration of environment-sensitive deep wells.
Chinese patent publication No. 101144009A (application No. 200610127246.0) discloses an environment-friendly anti-sloughing water-based biological modified silicate drilling fluid system. The low-fluorescence asphalt comprises fresh water or seawater slurry, xanthan gum, low-viscosity polyanionic cellulose, sulfonated phenolic resin, methylglucoside, a non-permeation treatment agent, a hydroxyl film-forming agent, low-fluorescence asphalt, an extreme pressure lubricant, sodium silicate, potassium chloride and fresh water or seawater. The mechanism of preventing collapsing of this patent is focused on the shutoff and reduces the filtration loss as far as promptly, prevents the clay inflation through the contact that reduces clay and water, and then stabilizes the wall of a well, prevents that the wall of a well from collapsing. The disclosed drilling fluid system is an environment-friendly anti-collapse water-based biological modified silicate drilling fluid system, the comprehensive performance of the drilling fluid system can be compared with that of an oil-based drilling fluid, the plugging capability is greatly superior to that of the oil-based drilling fluid, and the temperature resistance is 140 ℃.
Chinese patent with publication number 103740343A (application number 201410021057.X) provides Na2SiO3-KCl anti-sloughing drilling fluid and preparation method thereof, the Na2SiO3the-KCl anti-collapse drilling fluid is convenient for field maintenance, has strong inhibition capacity, low filtration loss, good compatibility with stratum, excellent thermal stability and rheological property, can balance the stratum pressure of a high-pressure layer section, and is an ideal anti-collapse drilling fluid with low cost and high environmental protection. The water loss at 120 ℃ under high temperature and high pressure is 14.8mL, and no environmental protection result is generated.
Chinese patent with publication number 103254879A (application number 201310175348.X) provides a composition for an anti-sloughing drilling fluid, an anti-sloughing drilling fluid and an anti-sloughing method. The composition for the anti-collapse drilling fluid contains bentonite, a fluid loss additive and a viscosity reducer, wherein the anti-collapse drilling fluid also contains a wetting reversal agent and a wetting reversal agent auxiliary agent, the wetting reversal agent is a copolymer of an acrylic monomer and styrene, and the wetting reversal agent auxiliary agent contains fatty amine and asphalt. The anti-collapse drilling fluid provided by the invention has excellent anti-collapse performance, but temperature resistance data is not provided, and environmental protection performance is not mentioned.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an environment-friendly anti-sloughing drilling fluid. In particular to an environment-friendly anti-sloughing drilling fluid and a preparation method thereof. The environment-friendly anti-collapse drilling fluid is an environment-friendly anti-collapse drilling fluid system taking environment-friendly anti-collapse modified starch as a main agent, has strong anti-collapse capability, has the application temperature of up to 150 ℃, is non-toxic and harmless, can reduce the environmental pollution to the maximum extent, and meets the requirements of drilling engineering on safety, high quality, rapidness and high efficiency.
One of the purposes of the invention is to provide an environment-friendly anti-sloughing drilling fluid which comprises the following components in parts by weight:
wherein the content of the first and second substances,
regarding the anti-sloughing starch, the content of the chinese patent with application number 201811204630.5 (an anti-sloughing modified starch for drilling fluid and the preparation method thereof) is incorporated herein in its entirety. The anti-collapse Starch has a structural general formula of Starch-O-C2NR or is (C)6H10O5)n-O-C2NR；
Wherein Starch is
Wherein n is 300-600, and R is a metal element;
preferably, R is a monovalent metal element; more preferably, R is at least one selected from K, Na, Ca or Mg. The molecular weight of the modified starch can be between 5 and 10 ten thousand.
The substitution degrees of the anion and the cation are within a certain range, the substitution degree of the anion is within a period of 0.34-0.38, and the substitution degree of the cation is within a period of 0.39-0.41. The substitution degree of anions adopts a complexometric titration method; the method can be used for testing by a common testing method in the field, and can be tested by a method for testing the substitution degree in national standard GB 1904-2005 food additive sodium carboxymethyl cellulose of the people's republic of China. The cation substitution degree measuring method is calculated according to the measurement of ammonia content, and the measuring method can refer to the national standard GB 608-88 of the general method for measuring nitrogen by chemical reagents, a semimicro method and the method GB 12091-89 for measuring the nitrogen content of starch and derivatives.
The anti-collapse starch can be prepared by the method comprising the following steps:
(1) dissolving starch in low-carbon alcohol to prepare starch suspension, dissolving a quaternary ammonium salt cationic agent and an alkaline catalyst in the starch suspension, and uniformly mixing to obtain starch slurry;
(2) adding a cross-linking agent and a starch acylating agent into the starch slurry, adding an alkaline catalyst for more than two times, heating, and reacting under stirring;
(3) and after the reaction is finished, adjusting the pH, washing with low-carbon alcohol, performing suction filtration, and drying to obtain the catalyst.
The ratio of the weight of the starch in the step (1) to the total weight of the alkaline catalyst used in the preparation method (the sum of the weight of the alkaline catalyst used in the step (1) and the weight of the alkaline catalyst used in the step (2)) can be (2-4): 1.
The weight ratio of the starch to the quaternary ammonium salt cationic agent can be (1-4): 1, and preferably (2-3): 1.
In the step (1), the weight ratio of starch in the starch slurry to the alkaline catalyst used in the step (1) is (10-16): 1.
in the step (2), the weight ratio of the starch in the starch slurry to the cross-linking agent is (1400-1700): 1. In the step (2), the weight ratio of starch in the starch slurry to the starch acylating agent is (4-5): 1.
The starch acylating agent can be various reagents capable of acylating or etherifying the hydroxyl group of the starch, preferably is halogenated carboxylic acid with 2-4 carbon atoms, and specifically can be one or more selected from chloroacetic acid, bromoacetic acid, dichloroacetic acid, dibromoacetic acid, trichloroacetic acid and tribromoacetic acid; chloroacetic acid is preferred.
The cross-linking agent can be at least one selected from epoxy chloropropane, propylene oxide, methyl epichlorohydrin, epoxy polydimethylsiloxane, phosphorus oxychloride, sodium trimetaphosphate, adipic acid, sodium tripolyphosphate, hexametaphosphate, formaldehyde and divalent or trivalent mixed anhydride; preferably epichlorohydrin, propylene oxide, methyl epichlorohydrin, phosphorus oxychloride, sodium trimetaphosphate, sodium tripolyphosphate, formaldehyde and divalent or trivalent mixed anhydride; more preferably epichlorohydrin.
The quaternary ammonium salt cationic agent is mainly nitrogen-containing organic amine derivative, wherein four alkyl groups are connected to a nitrogen atom, namely ammonium ions
All four hydrogen atoms ofAnd moiety is substituted with an alkyl group. The quaternary ammonium salt cationic agent can be at least one selected from alkyl dimethyl benzyl quaternary ammonium salt, alkyl trimethyl quaternary ammonium salt, dialkyl dimethyl quaternary ammonium salt and the like; specifically, the surfactant can be at least one selected from 2, 3-epoxypropyltrimethylammonium chloride, benzyltriethylammonium chloride and dodecyltrimethylammonium chloride.
The lower alcohol can be selected from at least one of methanol, ethanol and propanol;
the starch can be selected from at least one of corn starch, tapioca starch or potato starch;
in the step (1) and the step (2), the alkaline catalyst can be at least one of sodium hydroxide and potassium hydroxide.
Wherein the content of the first and second substances,
in the step (1), the starch can be dissolved in low carbon alcohol to prepare starch suspension with the weight concentration of 15-25%.
In the step (2), the temperature can be raised to 40-70 ℃.
In the step (2), the starch acylating agent and the alkaline catalyst can be respectively prepared into solutions and then used, specifically, the starch acylating agent can be dissolved in a low-carbon alcohol to prepare a starch acylating agent solution with the weight concentration of 3-10%, and the alkaline catalyst can be dissolved in the low-carbon alcohol to prepare a catalyst solution with the weight concentration of 4-11%;
in the step (2), a cross-linking agent, a starch acylating agent and a part of catalyst are added into the starch slurry, the temperature is raised, the reaction is carried out under stirring, and then the rest of the catalyst is added for reaction (specifically, the reaction is carried out for 3-6 h under the condition that the stirring speed is controlled to be 500-1000 rpm, and then the rest of the catalyst solution is added for reaction for 2-4 h); wherein the weight of the partial catalyst is 1/8-3/8 of the total amount of the catalyst used in the step (2). Wherein the residual catalyst solution is 1/8-3/8 residual; the catalyst is added twice, so that a certain pH value is kept in the whole reaction, the catalyst is added twice, the reaction is more sufficient, and the efficiency is higher.
In the step (3), the pH can be adjusted to 7.5-9 by using sulfuric acid after the reaction is finished. Meanwhile, the sulfuric acid can effectively purify the primary product and remove impurities.
Another component of the high temperature resistant modified starch is a product which is independently developed by the applicant, and the content of the chinese patent with publication number CN103665174A is incorporated herein in its entirety. The high-temperature-resistant modified starch contains a double-substituted starch structural unit and a triple-substituted starch structural unit, wherein the triple-substituted starch structural unit is shown as a formula (1), the double-substituted starch structural unit is shown as a formula (2) and/or is shown as a formula (3), the total amount of the double-substituted starch structural unit and the triple-substituted starch structural unit accounts for more than 20 wt% of the high-temperature-resistant modified starch, preferably 20-30 wt%, and the weight average molecular weight of the high-temperature-resistant modified starch is 5-60 ten thousand, preferably 8-58 ten thousand;
wherein R is1、R2And R3Each independently an alkylene group having 1 to 5 carbon atoms, M1、M2And M3Each independently is H, an alkali metal element or an alkaline earth metal element.
The polyanionic cellulose is selected from at least one of low-viscosity polyanionic cellulose and ultralow-viscosity polyanionic cellulose. The low-viscosity polyanionic cellulose is preferred, and the influence of the low-viscosity polyanionic cellulose on the rheological property of the drilling fluid system is small.
The humic acid water loss reducer is at least one selected from lignite lye, sulfonated lignite and potassium humate. Potassium humate is preferably selected from commonly used sulfonated lignite and potassium humate, has water loss reducing capacity and certain shale inhibition capacity, and is more environment-friendly compared with sulfonated lignite.
The anti-collapse starch is environment-friendly anti-collapse starch.
The calcium carbonate is superfine calcium carbonate.
The sodium bentonite is added into water to prepare base slurry, so that the viscosity and the shearing force of the drilling fluid are increased, the filtration loss is reduced to a certain degree, and the well wall is stabilized; the anti-collapse starch has the functions of inhibiting hydration expansion of the clay in the stratum and preventing the collapse of the well wall; the high-temperature resistant modified starch has the function of reducing the filtration loss and simultaneously increasing the viscosity and the shearing force under the high-temperature condition; polyanionic cellulose is a polymer filtrate reducer and mainly used for reducing the filtrate loss; the humic acid fluid loss reducer and the lignite resin have the main functions of reducing the fluid loss under the high-temperature condition; the sodium sulfite is an oxygen scavenger, has the sulfonation effect in the formula while removing oxygen, and improves the long-acting property of each treating agent; the calcium carbonate plays a role in bridging and plugging in the process of forming the mud cakes.
The invention also aims to provide a preparation method of the environment-friendly anti-sloughing drilling fluid, which comprises the following steps:
adding the sodium bentonite into water according to the using amount, uniformly stirring at a high speed, maintaining at normal temperature for 24 hours to prepare base slurry, adding the components comprising the collapse-proof starch, the high-temperature-resistant modified starch, the polyanionic cellulose, the humic acid fluid loss agent, the lignite resin, the sodium sulfite and the calcium carbonate into the base slurry according to the using amounts, respectively, stirring at a high speed, and uniformly mixing to obtain the sodium bentonite.
Effects of the invention
The invention takes the environment-friendly anti-collapse modified starch invented by the applicant as a main agent, preferably a plurality of treating agents are prepared, the anti-collapse starch plays a role of preventing clay expansion in a drilling fluid system and can reduce the filtration loss of the drilling fluid, thereby reducing the possibility of borehole wall collapse in two aspects of inhibiting the clay and reducing the contact of the clay and water, the other treating agents further improve the performance of the drilling fluid on the premise of ensuring the formula performance, the high-temperature resistant modified starch and the ultra-low viscosity polyanionic cellulose are taken as polymer filtrate reducer to stabilize the viscosity and shear force of the drilling fluid, the long-chain structure of the anti-collapse starch ensures the toughness of a mud cake formed on the borehole wall, thereby reducing the filtration loss, the humic acid filtrate reducer and the lignite resin have stronger filtration loss effect under the high-temperature condition, the high-temperature resistance of the anti-collapse starch can be improved, the long-acting property of the anti-collapse starch is ensured, and the anti-collapse starch is taken as a sodium sulfite deoxidant, the anti-collapse starch and other treating agents can be prevented from being oxidized too quickly to lose efficacy under the high-temperature condition, the calcium carbonate with the compounded grain size can block fine cracks and pores, and the polymer water loss reducer is supported when mud cakes are formed. The treating agents of the drilling fluid including the anti-sloughing starch are nontoxic and heavy metal-free products, are environment-friendly, and can be used for easily-collapsed wells with high environmental protection requirements on sea or land.
The invention relates to an environment-friendly anti-sloughing drilling fluid, which is prepared according to GB/T16783.1-2014 part 1 of field test of petroleum and natural gas industrial drilling fluid: the method in the Water-based drilling fluid test determines apparent viscosity, plastic viscosity, dynamic shear force and medium pressure water loss under the condition of room temperature, then seals the water-based drilling fluid in an aging tank for rolling for 16 hours at 150 ℃, and determines the apparent viscosity, the plastic viscosity, the dynamic shear force, the medium pressure water loss and the high-temperature high-pressure water loss at 150 ℃ after the water-based drilling fluid is cooled to the room temperature. The result shows that the environment-friendly anti-collapse drilling fluid has good rheological property and lower filter loss at the temperature of 150 ℃, and the drilling fluid system can be used at the high temperature of 150 ℃.
The drilling fluid is prepared according to the formula to carry out a shale expansion experiment, 6000psi is used for pressing an artificial rock core, the artificial rock core is soaked for 24 hours by using the environment-friendly anti-sloughing drilling fluid, and the expansion rate is measured to be 23.3%.
The drilling fluid is prepared according to the formula, the biotoxicity is detected according to GB/T18420.2-2009 'method for testing biotoxicity of pollutants for offshore oil exploration and development', the half lethal concentration LC50 value reaches 879000mg/L, is far greater than the biotoxicity allowable value 30000mg/L of the water-based drilling fluid in the first-class sea area required by the standard, and meets the biotoxicity requirement.
The environment-friendly anti-collapse drilling fluid system can be used for drilling in environment-sensitive areas and oceans, is particularly suitable for drilling in complex geological conditions such as stratums which are easy to collapse at high temperature of more than 150 ℃ and environment-sensitive areas, can keep better rheological property and lower filtration loss, has better anti-collapse performance and environmental protection, can reduce environmental pollution to the maximum extent, and meets the requirements of drilling engineering on safety, high quality, rapidness and high efficiency.
Detailed Description
The present invention will be further described with reference to the following examples. However, the present invention is not limited to these examples.
Source of raw materials
1. The anti-collapse starch is prepared by the preparation method of example 3 in Chinese patent with application number of 201811204630.5, and is specifically prepared by the following steps:
(1) dissolving 110g of corn starch in pure ethanol to prepare a corn starch suspension with the weight concentration of 22%, dissolving 55g of quaternary ammonium salt cationic agent 2, 3-epoxypropyltrimethylammonium chloride and 9g of alkaline catalyst sodium hydroxide in the corn starch suspension, and uniformly mixing to obtain corn starch slurry;
(2) dissolving 26g of chloroacetic acid with the weight concentration of more than 97% in ethanol to prepare a chloroacetic acid solution with the weight concentration of 6%; dissolving 24g of sodium hydroxide in ethanol to prepare a catalyst solution with the weight concentration of 6%; pouring the corn starch slurry prepared in the step (1) into a three-neck bottle, dropwise adding 0.07g of epoxy chloropropane, sequentially adding all chloroacetic acid solution prepared in the step and 3/8 weight of catalyst solution prepared in the step, heating to 50 ℃ in a constant-temperature water bath, reacting for 5 hours at a stirring speed of 500rpm, and then adding the rest of catalyst solution prepared in the step for reacting for 3 hours.
(3) And after the reaction is finished, neutralizing the pH value to 7.5-9 with sulfuric acid, washing with low-carbon alcohol, performing suction filtration, and performing forced air drying at the temperature of about 50 ℃ to obtain the product, namely the collapse-preventing starch.
2. The high-temperature-resistant modified starch is prepared by the preparation method of example 1 in Chinese patent with publication number CN103665174A (application number 201310432320.X), and specifically comprises the following steps: 100g of corn native starch (density 1.52 g/cm)3Weight average molecular weight of 5-10 ten thousand) is dissolved in methanol to prepare corn starch suspension with the concentration of 20 wt%; preparing chloroacetic acid into a 5.5 wt% chloroacetic acid methanol solution; the catalyst potassium hydroxide was formulated as a 7 wt% aqueous solution. And pouring 175g of the corn starch suspension into a three-neck flask, sequentially adding 70g of the chloroacetic acid solution and 130g of the catalyst potassium hydroxide solution with the mass of 1/4, controlling the temperature to 65 ℃ in a constant-temperature water bath, reacting for 3 hours at the stirring speed of 750rpm, and then adding the rest 3/4 potassium hydroxide solution at the same temperature and the same stirring speed for reacting for 3 hours. After the reaction is finished, usingNeutralizing the pH value of the solution to 7.5-9 with hydrochloric acid, washing with methanol, filtering, and air-drying at 50 deg.C to obtain high temperature resistant modified starch SMART for use.
3. Humic acid fluid loss reducer, humic acid potassium and Pingxiangxin chemical industry;
4. polyanionic cellulose, ultra-low viscosity polyanionic cellulose PAC-LV, ZiBo technology;
5. lignite resin, SPNH, sichuan feng.
Example 1
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: calculated by the adding amount of 500g of water, 20g of sodium bentonite is added, and after uniform stirring, the mixture is maintained for 24 hours at room temperature. Adding 5g of collapse-proof starch, 2.5g of high-temperature resistant modified starch SMART and 3.5g of PAC-LV, fully stirring to dissolve the polymer, and sequentially adding 15g of humic acid water loss reducer, 15g of lignite resin and 1.5g of Na2SO3And 15g of calcium carbonate (40-70 microns) and 30g of calcium carbonate (10-30 microns) are uniformly stirred to obtain the calcium carbonate.
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the apparent viscosity, the plastic viscosity, the dynamic shear force and the medium-pressure water loss of the environment-friendly anti-collapse drilling fluid under the condition of room temperature are measured by a method in water-based drilling fluid, then the environment-friendly anti-collapse drilling fluid is sealed in an aging tank and rolls for 16 hours at 150 ℃, and after the environment-friendly anti-collapse drilling fluid is cooled to the room temperature, the apparent viscosity, the plastic viscosity, the dynamic shear force, the medium-pressure water loss and the high-temperature high-pressure water loss at 150 ℃ of the aged drilling fluid are measured. The test results are shown in table 1 below:
TABLE 1 rheological property and filtration loss experimental result of environment-friendly anti-sloughing drilling fluid system
As can be seen from Table 1, after rolling for 16h at 150 ℃, the apparent viscosity, the plastic viscosity and the dynamic shear force are slightly reduced, the filtration loss under normal temperature and pressure is obviously reduced, and the filtration loss under high temperature and high pressure is 13.2mL, so that the environment-friendly anti-collapse drilling fluid system is stable in performance after being heated at high temperature and can be normally used at 150 ℃.
Example 2
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: taking 3 parts of 500g of water according to the adding amount of 500g of water, respectively adding 15g of sodium bentonite, 20g of sodium bentonite and 25g of sodium bentonite, stirring uniformly, and curing at room temperature for 24 hours. Adding 5g of collapse-proof starch, 2.5g of SMART and 3.5g of PAC-LV, fully stirring to dissolve the polymer, and sequentially adding 15g of humic acid water loss reducer, 15g of lignite resin and 1.5g of Na2SO315g of calcium carbonate (40-70 microns) and 30g of calcium carbonate (10-30 microns) are uniformly stirred to prepare the three parts of the environment-friendly anti-sloughing drilling fluid.
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the apparent viscosity, the plastic viscosity, the dynamic shear force, the medium pressure water loss and the high-temperature high-pressure water loss at 150 ℃ of the aged drilling fluid are measured respectively by a method in water-based drilling fluid, then the drilling fluid is sealed in an aging tank for 16 hours at 150 ℃, and the aged drilling fluid is cooled to room temperature. The test results are given in the following table:
table 2 experimental results of different bentonite dosage rheological properties and fluid loss of environment-friendly anti-sloughing drilling fluid system
Remarking: the addition amount of sodium bentonite in the formula 2 is 15g, and the other addition amounts are the same as those in the formula 1; formula 3 the amount of sodium bentonite added is 25g, and the other amounts are the same as formula 1.
As can be seen from Table 2, as the amount of sodium bentonite added increases, the apparent viscosity increases and the high-temperature high-pressure filtration loss slightly decreases.
Example 3
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: and taking 2 parts of 500g of water according to the adding amount of 500g of water, adding 20g of sodium bentonite into the 2 parts of 500g of water, uniformly stirring, and curing at room temperature for 24 hours. Adding 5g and 7.5g anti-collapse starch, respectively, and adding 2.5g SMART and 3.5g PAC-LVStirring to dissolve the polymer, and sequentially adding 15g of humic acid fluid loss additive, 15g of lignite resin and 1.5g of Na2SO315g of calcium carbonate (40-70 microns) and 30g of calcium carbonate (10-30 microns) are uniformly stirred to prepare two parts of the environment-friendly anti-sloughing drilling fluid.
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the method in the water-based drilling fluid test measures the apparent viscosity, plastic viscosity, dynamic shear force and medium-pressure water loss of two environmental-friendly anti-collapse drilling fluids under the condition of room temperature, seals the environmental-friendly anti-collapse drilling fluids in an aging tank, rolls for 16 hours at 150 ℃, and measures the apparent viscosity, plastic viscosity, dynamic shear force, medium-pressure water loss and high-temperature high-pressure water loss at 150 ℃ after aging after cooling to room temperature. The test results are given in the following table:
table 3 results of experiments on rheological properties and filtration losses of different anti-sloughing starches of the environment-friendly anti-sloughing drilling fluid system
Remarking: formula 4 the amount of anti-sloughing starch was 7.5g, and the other amounts were the same as formula 1.
As can be seen from Table 3, the amount of the anti-sloughing starch was increased, the apparent viscosity was slightly increased, and the high-temperature and high-pressure filtration loss was slightly decreased.
Example 4
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: and taking 2 parts of 500g of water according to the adding amount of 500g of water, adding 20g of sodium bentonite into the 2 parts of 500g of water, uniformly stirring, and curing at room temperature for 24 hours. Adding 5g of anti-collapse starch, stirring uniformly, adding 2.5g of SMART and 3.5g of SMART respectively, and then adding 3.5g of PAC-LV, 15g of humic acid fluid loss agent, 15g of lignite resin and 1.5g of Na in sequence2SO315g of calcium carbonate (40-70 microns) and 30g of calcium carbonate (10-30 microns) are uniformly stirred to prepare two parts of the environment-friendly anti-sloughing drilling fluid.
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the method in the water-based drilling fluid test measures the apparent viscosity, plastic viscosity, dynamic shear force and medium-pressure water loss of two environmental-friendly anti-collapse drilling fluids under the condition of room temperature, seals the environmental-friendly anti-collapse drilling fluids in an aging tank, rolls for 16 hours at 150 ℃, and measures the apparent viscosity, plastic viscosity, dynamic shear force, medium-pressure water loss and high-temperature high-pressure water loss at 150 ℃ after aging after cooling to room temperature. The test results are given in the following table:
table 4 results of experiments on different high temperature resistant modified starch dosage rheological properties and filtration losses of environment-friendly anti-sloughing drilling fluid system
Remarking: formula 5 the amount of high temperature resistant modified starch was 3.5g, and the other amounts were the same as in formula 1.
From Table 4, it can be seen that the high temperature resistant modified starch has an increased amount, an increased apparent viscosity, and a reduced high temperature and high pressure filtration loss of 20%.
Example 5
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: and taking 2 parts of 500g of water according to the adding amount of 500g of water, adding 20g of sodium bentonite into the 2 parts of 500g of water, uniformly stirring, and curing at room temperature for 24 hours. Adding 5g of collapse-proof starch and 2.5g of SMART, stirring uniformly, adding 3.5g of PAC-LV and 4g of PAC-LV respectively, stirring fully to dissolve the polymer, and then adding 15g of humic acid fluid loss agent, 15g of lignite resin and 1.5g of Na in sequence2SO315g of calcium carbonate (40-70 microns) and 30g of calcium carbonate (10-30 microns) are uniformly stirred to prepare two parts of the environment-friendly anti-sloughing drilling fluid.
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the method in the water-based drilling fluid test measures the apparent viscosity, plastic viscosity, dynamic shear force and medium-pressure water loss of two environmental-friendly anti-collapse drilling fluids under the condition of room temperature, seals the environmental-friendly anti-collapse drilling fluids in an aging tank, rolls for 16 hours at 150 ℃, and measures the apparent viscosity, plastic viscosity, dynamic shear force, medium-pressure water loss and high-temperature high-pressure water loss at 150 ℃ after aging after cooling to room temperature. The test results are given in the following table:
TABLE 5 Experimental results of different polyanionic cellulose dosage rheological properties and filtration losses of environmental protection anti-sloughing drilling fluid system
Remarking: formulation 6 polyanionic cellulose (low viscosity) was added in an amount of 4g, and the other amounts were the same as in formulation 1.
From Table 5, it is found that the amount of polyanionic cellulose (low viscosity) is increased, the apparent viscosity is increased, and the high-temperature and high-pressure fluid loss is remarkably decreased.
Example 6
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: and taking 2 parts of 500g of water according to the adding amount of 500g of water, adding 20g of sodium bentonite into the 2 parts of 500g of water, uniformly stirring, and curing at room temperature for 24 hours. Adding 5g of collapse-proof starch, 2.5g of SMART and 3.5g of PAC-LV, fully stirring to dissolve the polymer, respectively adding 15g and 20g of humic acid water loss reducer, and sequentially adding 15g of lignite resin and 1.5g of Na2SO315g of calcium carbonate (40-70 microns) and 30g of calcium carbonate (10-30 microns) are uniformly stirred to prepare two parts of the environment-friendly anti-sloughing drilling fluid.
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the method in the water-based drilling fluid test measures the apparent viscosity, plastic viscosity, dynamic shear force and medium-pressure water loss of two environmental-friendly anti-collapse drilling fluids under the condition of room temperature, seals the environmental-friendly anti-collapse drilling fluids in an aging tank, rolls for 16 hours at 150 ℃, and measures the apparent viscosity, plastic viscosity, dynamic shear force, medium-pressure water loss and high-temperature high-pressure water loss at 150 ℃ after aging after cooling to room temperature. The test results are given in the following table:
table 6 dosage rheological property and filtration loss experimental result of different humic acid water loss reducing agents of environment-friendly anti-sloughing drilling fluid system
Remarking: the addition amount of the humic acid fluid loss additive in the formula 7 is 20g, and the other addition amounts are the same as the formula 1.
From table 6, it can be seen that the addition of the humic acid fluid loss reducer is increased, the apparent viscosity is not obviously changed, and the high-temperature and high-pressure fluid loss is reduced.
Example 7
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: and taking 2 parts of 500g of water according to the adding amount of 500g of water, adding 20g of sodium bentonite into the 2 parts of 500g of water, uniformly stirring, and curing at room temperature for 24 hours. Adding 5g of anti-collapse starch, 2.5g of SMART and 3.5g of PAC-LV, fully stirring to dissolve the polymer, adding 15g of humic acid water loss reducer, respectively adding 15g and 20g of lignite resin, and sequentially adding 1.5g of Na2SO315g of calcium carbonate (40-70 microns) and 30g of calcium carbonate (10-30 microns) are uniformly stirred to prepare two parts of the environment-friendly anti-sloughing drilling fluid.
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the method in the water-based drilling fluid test measures the apparent viscosity, plastic viscosity, dynamic shear force and medium-pressure water loss of two environmental-friendly anti-collapse drilling fluids under the condition of room temperature, seals the environmental-friendly anti-collapse drilling fluids in an aging tank, rolls for 16 hours at 150 ℃, and measures the apparent viscosity, plastic viscosity, dynamic shear force, medium-pressure water loss and high-temperature high-pressure water loss at 150 ℃ after aging after cooling to room temperature. The test results are given in the following table:
table 7 Experimental results of different lignite resin addition rheological properties and filter loss of environment-friendly anti-sloughing drilling fluid system
Remarking: the addition amount of the lignite resin of the formula 8 is 20g, and the other addition amounts are the same as those of the formula 1.
It can be seen from Table 7 that the amount of the lignite resin added was increased, the apparent viscosity was not significantly changed, and the high-temperature and high-pressure fluid loss was decreased.
Example 8
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: taking 2 parts of 500g of water respectively and adding the 500g of water into the mixture according to the adding amount of the 500g of waterAdding 20g of sodium bentonite, stirring uniformly, and curing at room temperature for 24 h. Adding 5g of anti-collapse starch, 2.5g of SMART and 3.5g of PAC-LV, stirring sufficiently to dissolve the polymer, adding 15g of humic acid water loss reducer and 15g of lignite resin, and respectively adding 1.5g of Na and 2g of Na2SO3Then, 15g of calcium carbonate (40-70 micrometers) and 30g of calcium carbonate (10-30 micrometers) are sequentially added and uniformly stirred to prepare two parts of the environment-friendly anti-sloughing drilling fluid.
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the method in the water-based drilling fluid test measures the apparent viscosity, plastic viscosity, dynamic shear force and medium-pressure water loss of two environmental-friendly anti-collapse drilling fluids under the condition of room temperature, seals the environmental-friendly anti-collapse drilling fluids in an aging tank, rolls for 16 hours at 150 ℃, and measures the apparent viscosity, plastic viscosity, dynamic shear force, medium-pressure water loss and high-temperature high-pressure water loss at 150 ℃ after aging after cooling to room temperature. The test results are given in the following table:
TABLE 8 different Na values for environment-friendly anti-sloughing drilling fluid system2SO3Results of addition rheological property and filtration loss experiment
Remarking: na in formulation 92SO3The amount added was 2g, and the other amounts were the same as in formulation 1.
From Table 8, Na is shown2SO3The addition is increased, and the experimental results are not obviously changed.
Example 9
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: and taking 2 parts of 500g of water according to the adding amount of 500g of water, adding 20g of sodium bentonite into the 2 parts of 500g of water, uniformly stirring, and curing at room temperature for 24 hours. Adding 5g of anti-collapse starch, 2.5g of SMART and 3.5g of PAC-LV, fully stirring to dissolve the polymer, and sequentially adding 15g of humic acid water loss reducer, 15g of lignite resin and 1.5g of Na2SO3Then respectively adding 15g and 20g of calcium carbonate (40-70 microns), then adding 30g of calcium carbonate (10-30 microns), and uniformly stirring to prepare two parts of environment-friendly anti-sloughing drilling fluid。
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the method in the water-based drilling fluid test measures the apparent viscosity, plastic viscosity, dynamic shear force and medium-pressure water loss of two environmental-friendly anti-collapse drilling fluids under the condition of room temperature, seals the environmental-friendly anti-collapse drilling fluids in an aging tank, rolls for 16 hours at 150 ℃, and measures the apparent viscosity, plastic viscosity, dynamic shear force, medium-pressure water loss and high-temperature high-pressure water loss at 150 ℃ after aging after cooling to room temperature. The test results are given in the following table:
TABLE 9 Experimental results of different calcium carbonate addition rheological properties and filtration losses of environmental protection anti-sloughing drilling fluid system
Remarking: the amount of calcium carbonate (40-70 μm) in formula 10 was 20g, and the other amounts were the same as in formula 1.
As can be seen from Table 9, the addition of calcium carbonate (40-70 μm) was increased, and the results of the experiments were not significantly changed.
Example 10
Preparing the environment-friendly anti-sloughing drilling fluid:
the formula is as follows: and taking 2 parts of 500g of water according to the adding amount of 500g of water, adding 20g of sodium bentonite into the 2 parts of 500g of water, uniformly stirring, and curing at room temperature for 24 hours. Adding 5g of anti-collapse starch, 2.5g of SMART and 3.5g of PAC-LV, fully stirring to dissolve the polymer, and sequentially adding 15g of humic acid water loss reducer, 15g of lignite resin and 1.5g of Na2SO3And 15g of calcium carbonate (40-70 microns), then respectively adding 30g of calcium carbonate and 40g of calcium carbonate (10-30 microns), and uniformly stirring to prepare two parts of the environment-friendly anti-sloughing drilling fluid.
And (3) performance testing:
according to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the method in the water-based drilling fluid test measures the apparent viscosity, plastic viscosity, dynamic shear force and medium-pressure water loss of two environmental-friendly anti-collapse drilling fluids under the condition of room temperature, seals the environmental-friendly anti-collapse drilling fluids in an aging tank, rolls for 16 hours at 150 ℃, and measures the apparent viscosity, plastic viscosity, dynamic shear force, medium-pressure water loss and high-temperature high-pressure water loss at 150 ℃ after aging after cooling to room temperature. The test results are given in the following table:
TABLE 10 Experimental results of different calcium carbonate addition rheological properties and filtration losses of environmental protection anti-sloughing drilling fluid system
Remarking: the amount of calcium carbonate (10-30 μm) in formula 11 was 40g, and the other amounts were the same as in formula 1.
From table 10, it can be seen that the addition of calcium carbonate (10-30 μm) is increased, the apparent viscosity, plastic viscosity and dynamic shear force of the drilling fluid are increased, and the high-temperature and high-pressure fluid loss is reduced.
Example 11
The environment-friendly anti-sloughing drilling fluid is prepared according to the method of the example 1 to carry out shale expansion experiments. The experimental instrument is a shale expansion instrument produced by OFITF company in America, and the shale expansion experimental method is a method suggested by instrument and equipment specifications. Approximately 10g of sodium bentonite was pressed into an artificial core at 6000psi and soaked with distilled water and the environmentally friendly anti-sloughing drilling fluid prepared in example 1 for 24 hours, respectively, and the results are shown in table 11.
TABLE 11 results of shale expansion experiments
As can be seen from Table 11, the core expansion rate of the environment-friendly anti-collapse drilling fluid is reduced by 50% compared with that of distilled water.
Example 12
The environment-friendly anti-sloughing drilling fluid is prepared according to the method of the example 1, and the biotoxicity and half lethal concentration LC (liquid chromatography) is detected according to GB/T18420.2-2009' biotoxicity test method for pollutants for offshore oil exploration and development50The value reaches 879000mg/L, which is far more than the allowable value 30000mg/L of the biological toxicity of the water-based drilling fluid in the first-class sea area required by the standard, and meets the requirement of biological toxicity.
In conclusion, the environment-friendly anti-collapse drilling fluid has better rheological property and lower filtration loss under the high-temperature condition of 150 ℃, and can reduce the expansion rate of shale by more than 50%, which shows that the environment-friendly anti-collapse drilling fluid has good high-temperature resistance and anti-collapse capability, and meets the requirement of biological toxicity tolerance value in first-class sea areas through biological toxicity detection, thus the environment-friendly novel environment-friendly anti-collapse drilling fluid system is shown.
Comparative test example 1
A comparative formulation was prepared by formulating the drilling fluid system in accordance with the formulation proportions described in example 1 of an environmentally friendly, anti-sloughing water-based, biologically modified silicate drilling fluid system disclosed in Chinese patent publication No. 101144009A (application No. 200610127246.0). According to GB/T16783.1-2014, oil and gas industry drilling fluid field test part 1: the method in the Water-based drilling fluid test is characterized in that the drilling fluid is sealed in an aging tank and rolls for 16 hours at 150 ℃, and the apparent viscosity, the plastic viscosity, the dynamic shear force, the medium-pressure water loss and the high-temperature high-pressure water loss at 150 ℃ are measured after the drilling fluid is cooled to room temperature. The results of the tests compared with those of example 1 of the present invention are shown in the following table:
TABLE 12 rheology and fluid loss test results of comparative test examples
From table 12, it can be seen that after rolling at 150 ℃ for 15 hours, the viscosity and shear force of example 1 (formulation 1) of the present invention are both greater than those of the comparative formulation, and the fluid loss is small, indicating that the temperature resistance of the formulation of the present invention can reach 150 ℃ or higher. Comparative test example 2
Drilling fluids were formulated for shale expansion experiments as in example 1 and comparative test example 1. The experimental instrument is a shale expansion instrument produced by OFITF company in America, and the shale expansion experimental method is a method suggested by instrument and equipment specifications. Approximately 10g of sodium bentonite was pressed at 6000psi into an artificial core and soaked with the drilling fluid of formulation 1 and the comparative formulation for 24 hours, respectively, and the results are shown in table 13.
TABLE 13 shale expansion experiment comparative test results
As can be seen from Table 13, the core expansion rate of the environment-friendly anti-collapse drilling fluid is 23% lower than that of the comparative formula. The formula of the invention has better inhibition in the prior art.
Claims (12)
1. An environment-friendly anti-sloughing drilling fluid comprises the following components in parts by weight:
the anti-collapse starch is prepared from starch with the following structural general formula:
the preparation method specifically comprises the following steps:
(1) dissolving starch in low-carbon alcohol to prepare starch suspension, dissolving a quaternary ammonium salt cationic agent and an alkaline catalyst in the starch suspension, and uniformly mixing to obtain starch slurry;
(2) adding a cross-linking agent and a starch acylating agent into the starch slurry, adding an alkaline catalyst for more than two times, heating, and reacting under stirring;
(3) after the reaction is finished, adjusting the pH, washing with low-carbon alcohol, performing suction filtration, and drying to obtain the product;
the high-temperature-resistant modified starch contains a double-substituted starch structural unit and a triple-substituted starch structural unit, wherein the triple-substituted starch structural unit is shown as the following formula (1), the double-substituted starch structural unit is shown as the following formula (2) and/or is shown as the following formula (3),
wherein R is1、R2And R3Each independently an alkylene group having 1 to 5 carbon atoms, M1、M2And M3Each independently is H, an alkali metal element or an alkaline earth metal element.
2. The environment-friendly anti-sloughing drilling fluid as claimed in claim 1, characterized by comprising the following components in parts by weight:
3. the environment-friendly anti-sloughing drilling fluid of claim 1, wherein:
the ratio of the weight of the starch to the total weight of the alkaline catalyst in the step (1) and the step (2) is (2-4): 1;
in the step (1), the weight ratio of starch in the starch slurry to the alkaline catalyst used in the step (1) is (10-16): 1;
the weight ratio of the starch to the quaternary ammonium salt cationic agent is (1-4) to 1;
in the step (2), the weight ratio of starch in the starch slurry to the starch acylating agent is (4-5): 1;
in the step (2), the weight ratio of the starch in the starch slurry to the cross-linking agent is (1400-1700): 1.
4. The environment-friendly anti-sloughing drilling fluid of claim 1, wherein:
the starch acylating agent is selected from halogenated carboxylic acid with 2-4 carbon atoms;
the cross-linking agent is selected from at least one of epichlorohydrin, propylene oxide, methyl epichlorohydrin, epoxy polydimethylsiloxane, phosphorus oxychloride, sodium trimetaphosphate, adipic acid, sodium tripolyphosphate, hexametaphosphate, formaldehyde and divalent or trivalent mixed anhydride;
the quaternary ammonium salt cationic agent is selected from at least one of alkyl dimethyl benzyl quaternary ammonium salt, alkyl trimethyl quaternary ammonium salt and dialkyl dimethyl quaternary ammonium salt;
the lower alcohol is selected from at least one of methanol, ethanol and propanol;
the starch is selected from at least one of corn starch, cassava starch or potato starch;
in the step (1) and the step (2), the alkaline catalyst is at least one selected from sodium hydroxide and potassium hydroxide.
5. The environment-friendly anti-sloughing drilling fluid of claim 4, wherein:
the starch acylating agent is selected from at least one of chloroacetic acid, bromoacetic acid, dichloroacetic acid, dibromoacetic acid, trichloroacetic acid and tribromoacetic acid.
6. The environment-friendly anti-sloughing drilling fluid of claim 4, wherein:
the cross-linking agent is at least one selected from epichlorohydrin, propylene oxide, methyl epichlorohydrin, phosphorus oxychloride, sodium trimetaphosphate, sodium tripolyphosphate, formaldehyde and divalent or trivalent mixed anhydride.
7. The environment-friendly anti-sloughing drilling fluid of claim 1, wherein:
in the step (2), the temperature is raised to 40-70 ℃;
in the step (3), after the reaction is finished, the pH is adjusted to 7.5-9 by using sulfuric acid.
8. The environment-friendly anti-sloughing drilling fluid of claim 1 or 2, wherein:
the total amount of the double-substituted starch structural unit and the triple-substituted starch structural unit accounts for more than 20 weight percent of the high-temperature resistant modified starch, and the weight average molecular weight of the high-temperature resistant modified starch is 5-60 ten thousand.
9. The environment-friendly anti-sloughing drilling fluid of claim 8, wherein:
the total amount of the double-substituted starch structural unit and the triple-substituted starch structural unit accounts for 20-30 wt% of the high-temperature resistant modified starch.
10. The environment-friendly anti-sloughing drilling fluid of claim 8, wherein:
the weight average molecular weight of the high-temperature resistant modified starch is 8-58 ten thousand.
11. The environment-friendly anti-sloughing drilling fluid of claim 1 or 2, wherein:
the polyanionic cellulose is selected from at least one of low-viscosity polyanionic cellulose and ultralow-viscosity polyanionic cellulose;
the humic acid water loss reducer is at least one selected from lignite lye, sulfonated lignite and potassium humate.
12. The preparation method of the environment-friendly anti-sloughing drilling fluid as claimed in any one of claims 1 to 11, characterized by comprising the following steps:
adding the sodium bentonite into water according to the using amount, uniformly stirring at a high speed, curing at normal temperature to prepare base slurry, adding the components comprising the collapse-proof starch, the high-temperature-resistant modified starch, the polyanionic cellulose, the humic acid fluid loss agent, the lignite resin, the sodium sulfite and the calcium carbonate into the base slurry according to the using amount, stirring at a high speed, and uniformly mixing to obtain the sodium bentonite.
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| CN115491187B (en) * | 2022-08-08 | 2023-07-07 | 成都理工大学 | Multifunctional collapse-preventing engineering material with rock and preparation method and application thereof |
| CN116589601A (en) * | 2023-05-22 | 2023-08-15 | 山东一滕新材料股份有限公司 | Hydroxypropyl starch, preparation method thereof, modified hydroxypropyl starch and application thereof |
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