CN107828016B - Preparation method of viscosity reducer for drilling fluid - Google Patents

Preparation method of viscosity reducer for drilling fluid Download PDF

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CN107828016B
CN107828016B CN201711124972.1A CN201711124972A CN107828016B CN 107828016 B CN107828016 B CN 107828016B CN 201711124972 A CN201711124972 A CN 201711124972A CN 107828016 B CN107828016 B CN 107828016B
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parts
weight
drilling fluid
deionized water
stirring
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CN107828016A (en
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康建荣
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Jiangsu Normal University
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/52Amides or imides
    • C08F220/54Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F220/58Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F222/00Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
    • C08F222/04Anhydrides, e.g. cyclic anhydrides
    • C08F222/06Maleic anhydride
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02Well-drilling compositions
    • C09K8/03Specific additives for general use in well-drilling compositions
    • C09K8/035Organic additives
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02Well-drilling compositions
    • C09K8/04Aqueous well-drilling compositions
    • C09K8/14Clay-containing compositions
    • C09K8/18Clay-containing compositions characterised by the organic compounds
    • C09K8/22Synthetic organic compounds
    • C09K8/24Polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/52Amides or imides
    • C08F220/54Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F220/58Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
    • C08F220/585Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]

Abstract

The invention discloses a preparation method of a viscosity reducer for drilling fluid, which takes acrylic acid, maleic anhydride, 2-acrylamide-2-methylpropanesulfonic acid and amino trimethylene sodium phosphate as raw materials, and prepares the viscosity reducer by aqueous solution polymerization and physical compounding methods, wherein the raw materials are prepared according to the following weight parts: 10-20 parts of acrylic acid, 15-25 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-15 parts of maleic anhydride and 60-120 parts of aminotrimethylene sodium phosphate. The invention obtains a low molecular polymer by initiating the polymerization reaction of the monomer by the initiator, and the product can effectively reduce the viscosity of fresh water mud, salt water mud and calcium-containing mud by adding a small amount of the low molecular polymer into the drilling fluid, and simultaneously has certain filtrate loss reduction property, thereby being suitable for various water-based drilling fluid systems.

Description

Preparation method of viscosity reducer for drilling fluid
Technical Field
The invention relates to the field of preparation of oilfield chemical additives, and particularly relates to a preparation method of a viscosity reducer for drilling fluid.
Background
The viscosity reducer is an indispensable drilling fluid treating agent in the drilling process and plays an important role in adjusting the rheological property of the drilling fluid. In the drilling process, the viscosity and the shear force of a drilling fluid system are easily greatly increased due to the invasion and dispersion of solid phase particles, and the solid control equipment can remove part of large particle solid phases in the drilling fluid, but has limited effect on adjusting the rheological property of the drilling fluid, so that the rheological property of the drilling fluid is improved by adding a viscosity reducer in field operation.
Since the last 30 s researchers have developed many types of viscosity reducer products, while polymeric viscosity reducers are an important direction of viscosity reducer development. The drilling fluid viscosity reducer developed by copolymerizing 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid has good temperature resistance, salt resistance and calcium resistance; meanwhile, maleic anhydride can be introduced into the polymer, the price of the polymer is cheaper than that of acrylic acid, and the molecular structure contains more hydrated groups, so that the production cost of the viscosity reducer can be reduced, and the viscosity reduction performance can be improved. In recent years, with the development of drilling technology, the number of deep wells and ultra-deep wells with the bottom temperature of more than 200 ℃ is increased, the temperature resistance of the currently developed polymer viscosity reducer is generally below 180 ℃, and most of viscosity reducer products commonly used on site cannot meet the drilling requirement. In view of the above, there is a need to develop a novel viscosity reducer for drilling fluid, which has good viscosity reducing performance in saline drilling fluid with high mineralization degree and even containing calcium ions.
Disclosure of Invention
The invention aims to provide a preparation method of a viscosity reducer for drilling fluid, wherein the viscosity reducer is a low-molecular polymer, and the viscosity of fresh water mud, salt water mud and calcium-containing mud can be effectively reduced by adding a small amount of the viscosity reducer into the drilling fluid, and meanwhile, the viscosity reducer has certain filtration loss reduction.
A preparation method of a viscosity reducer for drilling fluid is characterized by comprising the following steps:
1) dissolving 10-20 parts of acrylic acid and 15-25 parts of 2-acrylamido-2-methylpropanesulfonic acid in 75-135 parts of deionized water for later use; dissolving 0.15-0.3 part of initiator in 5-9 parts of deionized water for later use; dissolving 5-15 parts of maleic anhydride and 1.2-2.4 parts of activity regulator in 20-60 parts of deionized water, fully stirring, and transferring into a reaction kettle;
2) heating a reaction kettle to 60 ℃, slowly dropwise adding the mixed solution of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and the initiator solution while stirring, heating the mixed solution to 90 ℃ after dropwise adding, reacting for 3-4 h while stirring to obtain a primary product, adjusting the pH value of the product to 7-8 by using an alkaline reagent, adding 60-120 parts of aminotrimethylene sodium phosphate, compounding and blending, and discharging to obtain the copolymer drilling fluid viscosity reducer.
Has the advantages that: the invention provides a preparation method of a viscosity reducer for drilling fluid, which has simple production flow and easily obtained raw materials, wherein an activity regulator which is a compound with high transfer constant is added in the preparation process, and the activity regulator can accelerate chain termination reaction, plays a role in reducing the polymerization degree of a generated polymer and does not influence the overall reaction speed. The product prepared by taking acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, maleic anhydride and amino sodium trimetaphosphate as main raw materials has outstanding viscosity reduction performance, and the viscosity of fresh water mud, salt water mud and calcium-containing mud can be effectively reduced by adding a small amount of the product into the drilling fluid, and meanwhile, the product has certain filtration loss reduction property, and is suitable for various water-based drilling fluid systems.
Detailed Description
Example 130
Dissolving 15 parts of acrylic acid and 20 parts of 2-acrylamido-2-methylpropanesulfonic acid in 105 parts of deionized water for later use; dissolving 0.2 part of ammonium persulfate in 6 parts of deionized water for later use; dissolving 5 parts of maleic anhydride and 1.6 parts of activity regulator in 20 parts of deionized water, fully stirring, and transferring into a reaction kettle; heating a reaction kettle to 60 ℃, slowly dropwise adding the mixed solution of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and ammonium persulfate solution while stirring, heating the mixed solution to 90 ℃ after dropwise adding, adjusting the stirring speed to 300-400 r/min, carrying out heat preservation reaction for 3-4 h to obtain an initial product, adjusting the pH value of the product to 7-8 by NaOH, adding 80 parts of aminotrimethylene sodium phosphate, compounding and blending, and discharging to obtain the copolymer drilling fluid viscosity reducer.
The preparation method of the activity regulator comprises the following steps:
adding 10.6 parts by weight of sodium hypophosphite monohydrate into 30 parts by weight of deionized water, magnetically stirring for 30min, transferring into a sealed glass reactor with a rubber plug, and heating to 80 ℃ while stirring; dissolving 5 parts by weight of poly (oxyethylene) -allyl methyl ether and 0.1 part by weight of sodium peroxodisulfate in 10 parts by weight of deionized water, slowly dropwise adding the mixture into the reactor, keeping the temperature between 83 and 85 ℃ for reaction for 2 hours, transferring the reaction solution to a rotary evaporator, evaporating the reaction solution to dryness, taking out the residue, adding 30 parts by weight of isopropanol, stirring and filtering, adding 6 parts by weight of thioglycolic acid, 10 parts by weight of n-dodecyl mercaptan and 8 parts by weight of sodium bentonite into the filtered product, fully stirring, mixing, standing overnight, filtering and drying to obtain the activity regulator.
Example 2
Exactly the same as example 1, except that: 10 parts of acrylic acid and 15 parts of 2-acrylamide-2-methylpropanesulfonic acid are added and dissolved in 75 parts of deionized water, 0.15 part of ammonium persulfate is added and dissolved in 5 parts of deionized water, 5 parts of maleic anhydride and 1.2 parts of activity regulator are added and dissolved in 20 parts of deionized water, and 60 parts of aminotrimethylene sodium phosphate is added.
Example 3
Exactly the same as example 1, except that: 10 parts of acrylic acid and 15 parts of 2-acrylamido-2-methylpropanesulfonic acid are added and dissolved in 75 parts of deionized water, 0.175 part of ammonium persulfate is added and dissolved in 5 parts of deionized water, 10 parts of maleic anhydride and 1.4 parts of activity regulator are added and dissolved in 40 parts of deionized water, and 70 parts of aminotrimethylene sodium phosphate is added.
Example 4
Exactly the same as example 1, except that: 10 parts of acrylic acid and 15 parts of 2-acrylamide-2-methylpropanesulfonic acid are added and dissolved in 75 parts of deionized water, 0.2 part of ammonium persulfate is added and dissolved in 6 parts of deionized water, 15 parts of maleic anhydride and 1.6 parts of activity regulator are added and dissolved in 60 parts of deionized water, and 80 parts of aminotrimethylene sodium phosphate is added.
Example 5
Exactly the same as example 1, except that: 0.225 part of ammonium persulfate is added and dissolved in 7 parts of deionized water, 10 parts of maleic anhydride and 1.8 parts of activity regulator are added and dissolved in 40 parts of deionized water, and 90 parts of aminotrimethylene sodium phosphate is added.
Example 6
Exactly the same as example 1, except that: 0.25 part of ammonium persulfate is added and dissolved in 7 parts of deionized water, 15 parts of maleic anhydride and 2 parts of activity regulator are added and dissolved in 60 parts of deionized water, and 100 parts of aminotrimethylene sodium phosphate is added.
Example 7
Exactly the same as example 1, except that: 20 parts of acrylic acid and 25 parts of 2-acrylamide-2-methylpropanesulfonic acid are added and dissolved in 135 parts of deionized water, 0.25 part of ammonium persulfate is added and dissolved in 8 parts of deionized water, 5 parts of maleic anhydride and 2 parts of activity regulator are added and dissolved in 20 parts of deionized water, and 100 parts of aminotrimethylene sodium phosphate is added.
Example 8
Exactly the same as example 1, except that: 20 parts of acrylic acid and 25 parts of 2-acrylamido-2-methylpropanesulfonic acid are added and dissolved in 135 parts of deionized water, 0.275 part of ammonium persulfate is added and dissolved in 8 parts of deionized water, 10 parts of maleic anhydride and 2.2 parts of activity regulator are added and dissolved in 40 parts of deionized water, and 110 parts of aminotrimethylene sodium phosphate is added.
Example 9
Exactly the same as example 1, except that: 20 parts of acrylic acid and 25 parts of 2-acrylamido-2-methylpropanesulfonic acid are added and dissolved in 135 parts of deionized water, 0.3 part of ammonium persulfate is added and dissolved in 9 parts of deionized water, 15 parts of maleic anhydride and 2.4 parts of activity regulator are added and dissolved in 60 parts of deionized water, and 120 parts of aminotrimethylene sodium phosphate is added.
Comparative example 1
Exactly the same as example 1, except that: except that no activity modifier was added.
Comparative example 2
Exactly the same as example 1, except that: except that the added activity modifier is thioglycolic acid.
Comparative example 3
Exactly the same as example 1, except that: except that no n-dodecyl mercaptan was added to the preparation of the activity modifier.
Comparative example 4
Exactly the same as example 1, except that: except that 5.3 parts by weight of sodium hypophosphite monohydrate was added when preparing the activity modifier.
Comparative example 5
Exactly the same as example 1, except that: the pH value is not adjusted when the viscosity reducer is prepared.
Comparative example 6
Exactly the same as example 1, except that: except that 2-acrylamido-2-methylpropanesulfonic acid was replaced by dimethyldiallylammonium chloride.
The viscosity reducers prepared in examples 1 to 9 of the present invention and comparative examples 1 to 6 were subjected to a performance test by the following method:
1. rheological Property test
Formula 4% of remolding soil slurry, 3% of SMP, 3% of KCl, 0.2% of FA367, 0.2% of NaOH, 0.8% of LV-CMC and 0.1% of Na2CO3+ weighting agent (ρ =1.40 g/cm)3) The samples are blank samples, the viscosity reducer samples in examples 1-9 and comparative examples 1-6 are respectively added into the blank samples to serve as test samples, and the weight of the viscosity reducer samples added into the drilling fluid is 0.5% of the weight of the drilling fluid. And (3) rolling the blank sample and the test sample at 180 ℃ for 16h, cooling to room temperature, stirring at a high speed for 30min, and testing the viscosity reduction rate.
In the formula (I), the compound is shown in the specification,D 1 viscosity reduction rate,%;
600blank spaceDrilling fluid without addition of viscosity-reducing agent600 reading;
600-drilling fluid added with viscosity reducer600 reading;
the rheological properties were measured according to the method specified in International GB/T16783.1-2006, and the data are shown in Table 1.
TABLE 1 rheological Properties test
As can be seen from Table 1, the viscosity of the blank drilling fluid is reduced after different samples are added, the apparent viscosity is generally reduced from 61.0 mPa.s to 42.0-53.0 mPa.s, and the viscosity reduction rate reaches 13.11-31.15%. The viscosity reducing effect of the viscosity reducer in example 1 is outstanding, the apparent viscosity is reduced to 17.0mPa · s, the viscosity reduction rate reaches 72.13%, the ratio of raw materials has great influence on the viscosity reducing performance of the viscosity reducer, and the viscosity reducing effect is the best when the ratio of the raw materials in example 1 reaches the optimal combination. In addition, comparative examples 1 to 4 show that the addition of the activity regulator and the proportion of the formula have large influence on the viscosity reducing performance of the viscosity reducer, and comparative examples 5 to 6 show that the selection of raw materials and synthesis conditions during the preparation of the viscosity reducer has prominent influence on the viscosity reducing performance.
2. Performance comparison of viscosity reducers in brine slurries, saturated brine slurries, calcium-containing slurries
Preparing saline slurry: adding 5 g of sodium carbonate and 100 g of bentonite into 1L of water, stirring at a high speed for 20 min, and standing and maintaining at room temperature for 24 h to obtain fresh water base slurry; and adding 40g of sodium chloride and 50g of evaluation soil into the fresh water base slurry, stirring at a high speed for 5 min, and standing and maintaining at room temperature for 24 h to obtain the salt slurry.
Preparing saturated saline slurry: and adding 360g of sodium chloride and 50g of evaluation soil into the fresh water base slurry, stirring at a high speed for 5 min, and standing and maintaining at room temperature for 24 h to obtain saturated salt water slurry.
Preparing calcium-containing slurry: adding 10g of calcium chloride and 50g of evaluation soil into the fresh water base slurry, stirring at a high speed for 5 min, and standing and maintaining at room temperature for 24 h to obtain the calcium-containing slurry.
Adding 0 percent, 0.1 percent, 0.2 percent, 0.3 percent and 0.4 percent of the viscosity reducer in the embodiment 1 in mass percent into saline cement slurry, saturated saline cement slurry and calcium-containing slurry, stirring for 30min, then rolling for 16h at 180 ℃, cooling to room temperature, stirring at high speed for 30min, and then testing the conventional performance of the drilling fluid.
TABLE 2 Performance of viscosity reducers in brine muds
TABLE 3 Performance of viscosity reducers in saturated brine muds
TABLE 5 Performance of viscosity reducers in calcium containing muds
As can be seen from tables 2, 3 and 4, when the addition amount of the viscosity reducer is 0.4% of the mass of the slurry, the viscosity reduction rate of the viscosity reducer in the saline slurry, the saturated saline slurry and the calcium-containing slurry is over 50%, and the filtration loss is in a descending trend along with the increase of the addition amount of the viscosity reducer, which indicates that the viscosity reducer has a good viscosity reduction effect, outstanding salt resistance and certain filtration loss reduction.

Claims (1)

1. A preparation method of a viscosity reducer for drilling fluid is characterized by comprising the following steps:
dissolving 15 parts of acrylic acid and 20 parts of 2-acrylamido-2-methylpropanesulfonic acid in 105 parts of deionized water for later use; dissolving 0.2 part of ammonium persulfate in 6 parts of deionized water for later use; dissolving 5 parts of maleic anhydride and 1.6 parts of activity regulator in 20 parts of deionized water, fully stirring, and transferring into a reaction kettle; heating a reaction kettle to 60 ℃, slowly dropwise adding the mixed solution of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and ammonium persulfate solution while stirring, heating the mixed solution to 90 ℃ after dropwise adding, adjusting the stirring speed to 300-400 r/min, carrying out heat preservation reaction for 3-4 h to obtain an initial product, adjusting the pH value of the product to 7-8 by using NaOH, adding 80 parts of aminotrimethylene sodium phosphate, compounding and blending, and discharging to obtain the copolymer drilling fluid viscosity reducer;
the preparation method of the activity regulator comprises the following steps:
adding 10.6 parts by weight of sodium hypophosphite monohydrate into 30 parts by weight of deionized water, magnetically stirring for 30min, transferring into a sealed glass reactor with a rubber plug, and heating to 80 ℃ while stirring; dissolving 5 parts by weight of poly (oxyethylene) -allyl methyl ether and 0.1 part by weight of sodium peroxodisulfate in 10 parts by weight of deionized water, slowly dropwise adding the mixture into the reactor, keeping the temperature between 83 and 85 ℃ for reaction for 2 hours, transferring the reaction solution to a rotary evaporator, evaporating the reaction solution to dryness, taking out the residue, adding 30 parts by weight of isopropanol, stirring and filtering, adding 6 parts by weight of thioglycolic acid, 10 parts by weight of n-dodecyl mercaptan and 8 parts by weight of sodium bentonite into the filtered product, fully stirring, mixing, standing overnight, filtering and drying to obtain the activity regulator.
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CN112111039B (en) * 2019-06-19 2022-05-20 中国石油化工股份有限公司 Dispersing agent, preparation method and application thereof
CN110330956B (en) * 2019-07-10 2020-07-03 黑龙江益瑞化工有限公司 Environment-friendly polyamino acid viscosity reducer for drilling fluid and preparation method thereof

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CN103087689A (en) * 2013-02-05 2013-05-08 四川仁智油田技术服务股份有限公司 High temperature resistance and viscosity reduction agent for water-based drilling fluid

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CN101928366B (en) * 2009-06-26 2013-10-02 中国石油化工集团公司 Method for preparing viscosity breaking agent for drilling fluid
CN106479457B (en) * 2016-08-30 2019-03-15 长江大学 A kind of drilling fluid heat and salinity tolerance thinner and its preparation and use
CN107201218B (en) * 2017-06-16 2019-12-03 中国石油集团渤海钻探工程有限公司 A kind of water base bentonite viscosity depressant for drilling fluid and preparation method thereof

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