CN110819319A - Drilling fluid system and preparation method thereof - Google Patents
Drilling fluid system and preparation method thereof Download PDFInfo
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- CN110819319A CN110819319A CN201810913195.7A CN201810913195A CN110819319A CN 110819319 A CN110819319 A CN 110819319A CN 201810913195 A CN201810913195 A CN 201810913195A CN 110819319 A CN110819319 A CN 110819319A
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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
- 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
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers 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 an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by heteroatoms or groups containing heteroatoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F228/00—Copolymers 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 bond to sulfur or by a heterocyclic ring containing sulfur
- C08F228/02—Copolymers 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 bond to sulfur or by a heterocyclic ring containing sulfur by a bond to sulfur
Abstract
The invention discloses a drilling fluid system and a preparation method thereof. The drilling fluid system is prepared from the following raw materials: 100 parts by weight of water; 2-10 parts of soil powder; 0.1-0.5 parts by weight of sodium carbonate; 0.1-2.0 parts by weight of a multifunctional treating agent; 1-4 parts by weight of a sulfonated material; 0.2-2 parts by weight of an asphalt material; 0.5-5 parts by weight of plugging material while drilling; 10-150 parts of barite. The method comprises the following steps: the drilling fluid system is prepared by stirring and mixing the components according to the dosage. The drilling fluid system has good effects on fluid loss reduction, lubrication and inhibition, and can meet the requirement of stratum drilling at the temperature of 140 ℃.
Description
Technical Field
The invention relates to the technical field of drilling fluid for oil fields, in particular to a drilling fluid system and a preparation method thereof.
Background
Water-based drilling fluids are one of the most widely used drilling fluid systems today. In order to meet the requirements of safe and rapid drilling, a drilling fluid system needs to have multiple functions and requirements of fluid loss reduction, lubrication, inhibition, collapse prevention, plugging, well wall stabilization and the like, but because the main functions of various treating agents of the drilling fluid are outstanding and the side function effect is not ideal, a drilling site usually stores various treating agents, the types of the treating agents of the drilling fluid during daily drilling can reach as many as 50-60, the types of the treating agents are multiple, so that the drilling fluid system is complex, the performance is difficult to maintain, the treating agents are not matched sometimes, the effect of the treating agents is influenced, the cost is increased, and the underground safety is influenced.
The patent (CN 103725271A) discloses an organic silicon fluorine strong-inhibition collapse-prevention high-temperature-resistant leakage-proof drilling fluid system, which ensures the stability of a well wall and prevents the problems of well leakage, pressure supporting and drill sticking caused by complex stratum and large stratum inclination angle and easy deflection. The patent (CN 104388065A) introduces a simulated oil-based drilling fluid with strong inhibition, strong blocking and high lubricity, and all main functions of the system are realized by compounding functional treatment agents. The patent (CN 105694829A) discloses a low-friction drilling fluid for drilling shale, which can overcome borehole instability, inhibit hydration collapse of shale stratum, reduce friction and prevent underground complexity. The components in the system comprise a viscosity reducer, a filtrate reducer, a lubricant, a nano paraffin emulsion and the like, and the effect of low friction resistance is realized by two lubricants, namely solid lubricant and liquid lubricant.
Chinese patent CN 104650832 a discloses an anti-sloughing water-based drilling fluid. Comprises the following substances in percentage by weight: 100 parts of fresh water; 4 parts of sodium bentonite; 0.1-1 part of coating inhibitor; 0.3-5 parts of amine strong inhibitor; 0.5-5 parts of a filtrate reducer; 0.3-1 part of a tackifier; 1-5 parts of a lubricant; 0.5-5 parts of high-efficiency aluminum-based plugging agent.
US patent US 20040235674 Al relates to a water-based drilling fluid. The method has the following characteristics and effects: 1. the water-based drilling fluid system has shale inhibition performance; 2. the drilling fluid system comprises components such as a defoaming agent, a bactericide, a bridging agent, a preservative, a dispersing agent, a flocculating agent, a filtrate reducer, a sulfur remover, a lubricant, an oxygen scavenger, salt, a scale inhibitor, a tackifier, a weighting agent and the like.
Patent WO 2010/031993 Al relates to a water-based drilling fluid. The method has the following characteristics and effects: 1. a water-based drilling fluid system with inhibiting function is used for water-sensitive stratum and can be used for replacing oil-based drilling fluid; 2. the system consists of non-ionic low molecular weight polyacrylamide, long-chain alcohol, silicate shale inhibitor and polyanionic cellulose.
The literature "laboratory research on silicate drilling fluids" (oil drilling technology, 2006.4) discloses a water-based drilling fluid. The method has the following characteristics and effects: 1. tests of influencing factors, formula optimization, anti-collapse inhibition and the like of the silicate drilling fluid show that: the pH value of the silicate drilling fluid is preferably controlled to be more than 11.0; the modulus is 2.8-3.0, the silicate has the best comprehensive performance, and the optimal addition amount is 2-4%. 2. The silicate drilling fluid basic formula developed indoors has good anti-collapse inhibition performance, stronger calcium resistance and anti-inferior soil pollution performance, and also has better electrical stability, temperature resistance and weighting performance; the film structure formed by the silicate drilling fluid and the rock core reduces the pollution depth of the rock core and has better performance of protecting an oil-gas layer. 3. The silicate drilling fluid formula comprises: 3% of bentonite, 0.7% of MV-CMC, 0.25% of HV-CMC, 3% of SMP-2, 3% of SPNH and 3% of KCl.
The document "indoor research and evaluation of a high-performance nano water-based drilling fluid" (chemical engineer, 2017.10) relates to a water-based drilling fluid. The method has the following characteristics and effects: 1. the purpose of excellent drilling fluid plugging property and lubricating property is achieved by adding the mixed nano material complexing agent and a small amount of efficient lubricant; 2. the drilling fluid system has plugging inhibition performance, lubricating performance and anti-fouling performance,the comprehensive performance of the drilling fluid is close to that of an oil-based drilling fluid, the drilling fluid has various important properties required by a shale gas development water-based drilling fluid, and the purposes of cost reduction and efficiency improvement are achieved; 3. the formula of the system is as follows: water + 0.1% NaOH + 0.25% Na2CO3+ 1% of STBHT + 1% of B-DE + 10% of nano-composite agent + 2% of nanoemulsion 2709+ 1% of UHIB-B + barite (1.35g cm)-3)。
It can be seen from the above patent documents that various functions of the reported water-based drilling fluid system are realized by a single treating agent, and a drilling fluid system which realizes multiple functions by one multifunctional treating agent and can effectively realize full-effect functions and effects by a few treating agents is lacked.
Aiming at the problems that the prior water-based drilling fluid system has various treating agents, the main function of the treating agent is outstanding, the side function effect is not ideal, and the compatibility between various treating agents in the drilling fluid system is poor, and the like, a simplified drilling fluid system based on a multifunctional treating agent is provided.
Disclosure of Invention
In order to solve the problems of complex system, multiple types of treating agents, high maintenance difficulty of field drilling fluid and the like of the existing drilling fluid, the invention provides a drilling fluid system and a preparation method thereof, and a simplified drilling fluid system is formed by replacing a common macromolecule coating agent (such as KPAM), a lubricant (vegetable oil or mineral oil-based lubricant) and a filtrate reducer in the drilling fluid with a multifunctional treating agent with good functions of reducing the filtration loss, lubricating and inhibiting. The multifunctional treating agent has the using efficiency of the main functions of the three treating agents, and the purposes of simplifying a drilling fluid system and maintenance work, reducing the using amount of the treating agent and reducing the maintenance and treatment difficulty of the field drilling fluid are achieved.
The core of the drilling fluid system is that a multifunctional treating agent with high-efficiency fluid loss reducing, lubricating and mud shale expansion inhibiting effects is adopted, and other treating agents with a plurality of functions are added to form the system-simplified full-performance drilling fluid, so that the drilling fluid has good effects on fluid loss reducing, lubricating and inhibiting, and can meet the requirement of stratum drilling at the temperature of 140 ℃.
It is an object of the present invention to provide a drilling fluid system.
The drilling fluid system is prepared from the following raw materials:
the components are calculated according to the parts by weight,
the system density is 1.1-1.8 g/cm3。
The multifunctional treating agent adopts one of the following two formulas:
the formula I is as follows: the multifunctional treating agent is prepared from the following raw materials:
the components are calculated according to the parts by weight,
the monomer 1 is one of acrylamide, methacrylamide, n-isopropyl acrylamide or alkanolamide; the alkanolamide is preferably dodecyl diethanolamide;
the monomer 2 is one of allyl sulfonate, styrene sulfonate or alkyl alkenyl sulfonate; preferably sodium allyl sulfonate or sodium styrene sulfonate or sodium C10-C20 alkyl alkenyl sulfonate;
the monomer 3 is N-vinyl pyrrolidone, acrylic acid or styrene;
the monomer 4 is acryloyloxyethyltrimethyl ammonium chloride, acryloyloxybutyltrimethyl ammonium chloride, methacryloyloxyethyltrimethylammonium chloride or dimethyldiallylammonium chloride;
the initiator 1 is azobisisobutyronitrile, ammonium persulfate, hydrogen peroxide or diacyl peroxide;
the initiator 2 is ferrous sulfate, sodium bisulfite, sodium sulfite or sulfur dioxide;
the pH regulator is sodium hydroxide, potassium hydroxide, lithium hydroxide or calcium hydroxide.
The monomer 1 is used for improving the adsorption performance of target molecules on the surface of drill cuttings and is beneficial to improving the coating capacity of the drill cuttings, the monomer 2 is used for improving the temperature resistance and hydration capacity of molecules, the monomer 3 is used for improving the temperature resistance and the fluid loss reduction effect of the molecules, and the monomer 4 is used for improving the adsorption capacity of the molecules on the surface of clay and changing the wettability of the adsorbed solid phase surface and is beneficial to enhancing the lubricating performance.
The preparation method of the multifunctional treating agent comprises the following steps:
firstly, adding the monomer 2 and the monomer 3 with the above dosage into water, adjusting the pH value, then adding the monomer 1 and the monomer 4, adding the initiator 1 and the initiator 2 for reaction, crushing and drying to obtain the drilling fluid treating agent.
Preferably:
and adding the monomer 2 and the monomer 3 into water at normal temperature, stirring until the monomers are completely dissolved, and adjusting the pH of the solution to 6.0-9.0 by using a pH regulator.
Adding the monomer 1 and the monomer 4, cooling the solution to 35-45 ℃, then filling nitrogen into the solution for 15-30 minutes, dropwise adding the initiator 1 and the initiator 2 into the mixed solution in sequence under a stirring state, sealing after uniformly stirring, keeping the temperature of the solution at 30-50 ℃, reacting for 1-5 hours, and obtaining a gel product.
And shearing the gel product, drying for 4-8 hours at 100-105 ℃, and crushing to obtain the drilling fluid treating agent.
And a second formula:
the components are calculated according to the parts by weight,
the first monomer is 2-acrylamide-2-methylpropanesulfonic acid, methyl propylene sulfonate, 2-dimethylolbutyric acid-3' -sodium sulfonate propyl ester or acrylamide phenyl ethanesulfonic acid; the methacrylic sulfonate is preferably sodium methacrylic sulfonate;
the monomer II is acrylic acid, tert-butyl acrylate and methacrylate;
the monomer III is N, N-methylene bisacrylamide, N-hydroxymethyl acrylamide, alkyl succinamide (alkyl is preferably C6-C16) or N-butoxy methacrylamide;
the monomer IV is diallyl dimethyl ammonium chloride, trimethyl epoxy propyl ammonium chloride and trimethyl allyl ammonium chloride;
the first initiator is hydrogen peroxide, persulfate or sodium perchlorate; wherein the persulfate is preferably sodium persulfate;
the initiator II is sodium bisulfite, tetraethylene imine or sodium thiosulfate;
the pH regulator A is calcium hydroxide, sodium hydroxide or magnesium hydroxide.
The monomer I is used for improving the adsorption performance of target molecules on the surface of drill cuttings and is beneficial to improving the coating capacity of the drill cuttings, the monomer II is used for improving the temperature resistance and hydration capacity of the molecules, the monomer III has the functions of improving the temperature resistance and the fluid loss reduction effect of the molecules, and the monomer IV is used for improving the adsorption capacity of the molecules on the surface of clay and changing the wettability of the adsorbed solid phase surface and is beneficial to enhancing the lubricating performance.
The preparation method of the multifunctional treating agent comprises the following steps:
firstly, adding a monomer I and a monomer II into water according to the dosage, adjusting the pH value, then adding a monomer III and a monomer IV, adding an initiator I and an initiator II to react, crushing and drying to obtain the drilling fluid treating agent.
Among them, preferred are:
and adding the monomer I and the monomer II into water at normal temperature, stirring until the monomers are completely dissolved, and adjusting the pH value of the solution to 6.5-9.0 by using a pH regulator.
And adding a monomer III and a monomer IV into the solution after adjusting the pH value, cooling the solution to 30-40 ℃, and filling nitrogen into the solution for 15-30 minutes. And after nitrogen is filled, dropwise adding the initiator I and the initiator II into the mixed solution in sequence under the stirring state, uniformly stirring, sealing, keeping the temperature of the solution at 35-50 ℃, and reacting at constant temperature for 3-8 hours to obtain a gel product.
And shearing the gel product, drying for 4-8 hours at 100-110 ℃, and crushing to obtain the drilling fluid treating agent.
The drilling fluid system is prepared by stirring and mixing the components according to the dosage
The soil powder is one of sodium bentonite, calcium bentonite, montmorillonite, chlorite and illite, and has the functions of improving the flow pattern of the drilling fluid, forming a high-quality mud cake on the well wall and improving the lubricity between the drill rod and the well wall.
The asphalt material is one of asphalt powder, emulsified asphalt, oxidized asphalt and sulfonated asphalt, and has the functions of plugging formation pores and microcracks and reducing or preventing formation collapse and block falling caused by microcracks and the like;
the softening point range of the asphalt material is 60-200 ℃.
The sulfonated material is one or a combination of sulfonated lignite, sulfonated phenolic resin, lignite resin, sulfonated tannin and sulfonated tannin extract, and has the effects of improving the quality of mud cakes and keeping the stability of the well wall.
The plugging material while drilling comprises one or more of superfine calcium carbonate and fibers (glass fibers, asbestos fibers and bamboo fibers), wherein the median range of the particle size of calcium carbonate particles is 5-50 mu m, the diameter of the fiber material is 1-10 mu m, the length of the fiber material is 10-200 mu m, and the plugging material has the effects of plugging and improving the viscous cutting effect of a system;
wherein the median range of the particle size of the calcium carbonate particles is 5-50 μm, the diameter range of the fiber material is 1-10 μm, and the length range is 10-200 μm.
The invention also aims to provide a preparation method of the drilling fluid system.
The method comprises the following steps:
the drilling fluid system is prepared by stirring and mixing the components according to the dosage.
The method comprises the specific steps of firstly adding sodium carbonate into water, adding soil powder after dissolving, sealing and standing for more than 24 hours after uniformly stirring, adding a multifunctional treating agent in a stirring state after the soil powder is hydrated, sequentially adding a sulfonated material, an asphalt material and a plugging material while drilling after dissolving, and finally adding a weighting agent, and preparing the simplified drilling fluid system after uniformly stirring. The sulfonated material, the asphalt material and the plugging material while drilling have no special addition sequence requirements.
ADVANTAGEOUS EFFECTS OF INVENTION
The drilling fluid system and the preparation method thereof have good effects of reducing filtration, lubricating, plugging, inhibiting mud shale expansion and the like, meet the requirement of drilling on the performance of drilling fluid when the formation temperature is within 140 ℃, obviously reduce the types and the number of added treating agents in the drilling fluid system, and reduce the difficulty and the complexity of system maintenance and treatment.
Detailed Description
The present invention will be further described with reference to the following examples.
Multifunctional treating agent A
6.5 parts of monomer 1 acrylamide, 8 parts of monomer 2 sodium allylsulfonate, 4.0 parts of monomer 3N-vinyl pyrrolidone, 3.0 parts of monomer 4 acryloyloxyethyl trimethyl ammonium chloride, 0.08 part of initiator 1 azobisisobutyronitrile, 0.04 part of initiator 2 ferrous sulfate, 2.6 parts of pH regulator sodium hydroxide and 100 parts of water.
Firstly, adding monomer 2 sodium allylsulfonate and monomer 3N-vinyl pyrrolidone into water, adjusting the pH value of the solution, adding monomer 1 acrylamide and monomer 4 acryloyloxyethyl trimethyl ammonium chloride, adding initiator 1 and initiator 2, reacting for 4 hours at constant temperature, drying and crushing to obtain the multifunctional drilling fluid treating agent product. The method comprises the following specific steps: adding 8 parts of monomer 2 sodium allylsulfonate and 4.0 parts of monomer 3N-vinyl pyrrolidone into 100 parts of water at normal temperature, stirring until the mixture is completely dissolved, adjusting the pH of the solution to 7.0 by using 2.6 parts of pH regulator sodium hydroxide, adding 6.5 parts of monomer 1 acrylamide and 3.0 parts of monomer 4 acryloyloxyethyl trimethyl ammonium chloride into the solution, cooling the solution to 40 ℃, then filling nitrogen into the solution for 15 minutes, dropwise adding 0.08 part of initiator 1 ammonium persulfate and 0.04 part of initiator 2 ferrous sulfate into the mixed solution in a stirring state, uniformly stirring, sealing, keeping the temperature of the solution at 40 ℃, reacting at constant temperature for 4 hours to obtain a gel product, shearing, drying at 105 ℃ for 8 hours, and crushing to obtain the multifunctional treating agent A.
Multifunctional treating agent B
24 parts of monomer 1 methacrylamide, 28 parts of monomer 2 sodium styrene sulfonate, 11 parts of monomer 3 acrylic acid, 6.0 parts of monomer 4 acryloyloxybutyl trimethyl ammonium chloride, 0.31 part of initiator 1 ammonium persulfate, 0.16 part of initiator 2 sodium bisulfite, 4.4 parts of pH regulator potassium hydroxide and 100 parts of water.
Firstly, adding monomer 2 sodium styrene sulfonate and monomer 3 acrylic acid into water, adjusting the pH value of the solution, adding monomer 1 methacrylamide and monomer 4 acryloyloxybutyltrimethylammonium chloride, adding an initiator, reacting for 5 hours at constant temperature, drying and crushing to obtain the multifunctional drilling fluid treating agent product. The method comprises the following specific steps: adding 28 parts of monomer 2 sodium styrene sulfonate and 11 parts of monomer 3 acrylic acid into 100 parts of water at normal temperature, stirring until the mixture is completely dissolved, adjusting the pH value of the solution to 6.0 by using 4.4 parts of pH regulator potassium hydroxide, adding 24 parts of monomer 1 methacrylamide and 6.0 parts of monomer 4 acryloyloxybutyltrimethylammonium chloride into the solution, cooling the temperature of the solution to 35 ℃, charging nitrogen into the solution for 30 minutes, dropwise adding 0.31 part of initiator 1 ammonium persulfate and 0.16 part of initiator 2 sodium bisulfite into the mixed solution in a stirring state, uniformly stirring, sealing, keeping the temperature of the solution at 30 ℃, reacting at constant temperature for 5 hours, shearing the gelatinous product, drying at 100 ℃ for 6 hours, and crushing to obtain the multifunctional treating agent B.
Multifunctional treating agent C
Adding 7 parts of monomer-2-acrylamide-2-methylpropanesulfonic acid and 3 parts of monomer diacrylic acid into 100 parts of water at normal temperature, stirring until the monomers are completely dissolved, adjusting the pH value of the solution to 9.0 by using 2.5 parts of pH regulator sodium hydroxide, adding 4 parts of monomer tri-N, N-methylene bisacrylamide and 3 parts of monomer tetra-diallyl dimethyl ammonium chloride into the solution, cooling the solution to 40 ℃, filling nitrogen into the solution for 15 minutes, dropwise adding 0.06 part of initiator-hydrogen peroxide and 0.03 part of initiator-sodium bisulfite into the mixed solution in a stirring state, uniformly stirring, sealing, keeping the temperature of the solution at 35 ℃, reacting at a constant temperature for 8 hours, shearing the gelatinous product, drying at 100 ℃ for 8 hours, and crushing to obtain the multifunctional treating agent C.
Example 1:
drilling fluid systems includeThe following components: 3.0 parts of sodium bentonite, 0.1 part of sodium carbonate, 0.2 part of multifunctional treating agent A, 1.0 part of sulfonated lignite, 0.5 part of lignite resin, 0.5 part of oxidized asphalt, 1 part of superfine calcium carbonate, 12 parts of barite, 100 parts of water and 1.11g/cm of drilling fluid density3。
Firstly, 0.1 part of sodium carbonate is added into 100 parts of water, 3.0 parts of sodium bentonite is added into a sodium carbonate solution, the mixture is maintained for 24 hours, 0.2 part of multifunctional treating agent A, 1.0 part of sulfonated lignite, 0.5 part of lignite resin, 0.5 part of oxidized asphalt (softening point 150 ℃) and 1 part of superfine calcium carbonate (particle size median range is 5-40 mu m) are sequentially added under the stirring condition, 12 parts of barite is added after the treating agent is dispersed and dissolved, and the system density is 1.11g/cm3。
Drilling fluid performance was tested according to the method specified in the drilling fluid testing procedure (SY/T5621-.
The properties of the simplified drilling fluid system prepared in example 1 before and after aging at 140 ℃ for 16h are shown in table 1. The simplified drilling fluid system formed in example 1 has lower medium pressure and HTHP fluid loss as well as good lubrication and inhibition properties.
Table 1 example 1 simplified drilling fluid system properties
Example 2:
the drilling fluid system comprises the following components: 8.5 parts of calcium bentonite, 0.4 part of sodium carbonate, 1.5 parts of multifunctional treating agent B, 2.5 parts of sulfonated lignite, 1.5 parts of sulfonated lignite resin, 1.6 parts of sulfonated asphalt, 4.5 parts of glass fiber, 142 parts of barite, 100 parts of water and 1.79g/cm of drilling fluid density3。
Firstly, adding 0.4 part of sodium carbonate into 100 parts of water, adding 8.5 parts of calcium bentonite into a sodium carbonate solution, curing for 24 hours, sequentially adding 1.5 parts of multifunctional treating agent B, 2.5 parts of sulfonated lignite, 1.5 parts of sulfonated lignite resin, 1.6 parts of sulfonated asphalt (the softening point is 140 ℃) and 4.5 parts of glass fiber (the diameter of the glass fiber is 1-8 mu m, the length of the glass fiber is 20-150 mu m) under the stirring condition, adding 142 parts of barite after the treating agent is dispersed and dissolved,the density of the system is 1.79g/cm3。
Drilling fluid performance was tested according to the method specified in the drilling fluid testing procedure (SY/T5621-.
The properties of the simplified drilling fluid system prepared in example 2 before and after aging at 140 ℃ for 16h are shown in table 2. Example 2 formed a simplified drilling fluid system with lower medium pressure and HTHP fluid loss as well as good lubrication and inhibition properties.
Table 2 example 2 simplified drilling fluid system performance
Example 3:
the present embodiments provide a simplified drilling fluid system and a method for preparing the same, the simplified drilling fluid system comprising the following components: 6 parts of montmorillonite, 0.3 part of sodium carbonate, 1 part of multifunctional treating agent C, 1.5 parts of sulfonated lignite resin, 1.5 parts of sulfonated phenolic resin SMP-2, 1.0 part of emulsified asphalt, 1.5 parts of superfine calcium carbonate and 1.5 parts of asbestos fiber, 80 parts of barite, 100 parts of water and 1.55g/cm of drilling fluid density3。
Firstly, 0.3 part of sodium carbonate is added into 100 parts of water, 6 parts of montmorillonite is added into a sodium carbonate solution, the mixture is maintained for 24 hours, 1 part of multifunctional treating agent C, 1.5 parts of sulfonated lignite resin, 1.5 parts of sulfonated phenolic resin SMP-2, 1.0 part of emulsified asphalt (softening point 180 ℃) and 1.5 parts of superfine calcium carbonate (particle size median range is 5-45 mu m) and 1.5 parts of asbestos fiber (diameter of the asbestos fiber is 2-8 mu m and length of 40-120 mu m) are sequentially added under the stirring condition, 80 parts of barite is added after the treating agent is dispersed and dissolved, and the system density is 1.55g/cm3。
Drilling fluid performance was tested according to the method specified in the drilling fluid testing procedure (SY/T5621-. The properties of the simplified drilling fluid system prepared in example 3 before and after aging at 140 ℃ for 16h are shown in table 3. Example 3 formed a simplified drilling fluid system with lower medium pressure and HTHP fluid loss as well as good lubrication and inhibition properties.
Table 3 example 3 simplified drilling fluid system performance
Claims (10)
1. A drilling fluid system, characterized in that the drilling fluid system is prepared from raw materials comprising:
the components are calculated according to the parts by weight,
the system density is 1.1-1.8 g/cm3。
2. The drilling fluid system of claim 1, wherein:
the multifunctional treating agent adopts one of the following two formulas:
the formula I is as follows: the multifunctional treating agent is prepared from the following raw materials:
the components are calculated according to the parts by weight,
the monomer 1 is one of acrylamide, methacrylamide, n-isopropyl acrylamide or alkanolamide;
the monomer 2 is one of allyl sulfonate, styrene sulfonate or alkyl alkenyl sulfonate;
the monomer 3 is N-vinyl pyrrolidone, acrylic acid or styrene;
the monomer 4 is acryloyloxyethyltrimethyl ammonium chloride, acryloyloxybutyltrimethyl ammonium chloride, methacryloyloxyethyltrimethylammonium chloride or dimethyldiallylammonium chloride;
the initiator 1 is azobisisobutyronitrile, ammonium persulfate, hydrogen peroxide or diacyl peroxide;
the initiator 2 is ferrous sulfate, sodium bisulfite, sodium sulfite or sulfur dioxide;
the pH regulator is sodium hydroxide, potassium hydroxide, lithium hydroxide or calcium hydroxide;
the formula II comprises the following raw materials:
the components are calculated according to the parts by weight,
the first monomer is 2-acrylamide-2-methylpropanesulfonic acid, methyl propylene sulfonate, 2-dimethylolbutyric acid-3' -sodium sulfonate propyl ester or acrylamide phenyl ethanesulfonic acid;
the monomer II is acrylic acid, tert-butyl acrylate and methacrylate;
the monomer III is N, N-methylene bisacrylamide, N-hydroxymethyl acrylamide, alkyl succinamide or N-butoxy methacrylamide;
the monomer IV is diallyl dimethyl ammonium chloride, trimethyl epoxy propyl ammonium chloride and trimethyl allyl ammonium chloride;
the first initiator is hydrogen peroxide, persulfate or sodium perchlorate;
the initiator II is sodium bisulfite, tetraethylene imine or sodium thiosulfate;
the pH regulator A is calcium hydroxide, sodium hydroxide or magnesium hydroxide.
3. The drilling fluid system of claim 2, wherein:
in the first formula, the components are calculated according to the parts by weight,
the second formula comprises the components in parts by weight,
4. the drilling fluid system of claim 2, wherein:
the multifunctional treating agent is prepared by one of the following two methods:
firstly, adding the monomer 2 and the monomer 3 with the dosages into water, adjusting the pH value, then adding the monomer 1 and the monomer 4, adding the initiator 1 and the initiator 2 for reaction, crushing and drying to prepare the multifunctional treating agent;
or the like, or, alternatively,
firstly, adding a monomer I and a monomer II into water according to the dosage, adjusting the pH value, then adding a monomer III and a monomer IV, adding an initiator I and an initiator II to react, crushing and drying to obtain the multifunctional treating agent.
5. The drilling fluid system of claim 1, wherein:
the drilling fluid system comprises the following components in parts by weight,
6. the drilling fluid system of claim 1, wherein:
the soil powder is one of sodium bentonite, calcium bentonite, montmorillonite, chlorite and illite.
7. The drilling fluid system of claim 1, wherein:
the asphalt material is one of asphalt powder, emulsified asphalt, oxidized asphalt and sulfonated asphalt;
the softening point range of the asphalt material is 60-200 ℃.
8. The drilling fluid system of claim 1, wherein:
the sulfonated material is one or a combination of sulfonated lignite, sulfonated phenolic resin, lignite resin, sulfonated tannin and sulfonated tannin extract.
9. The drilling fluid system of claim 1, wherein:
the plugging material while drilling is one or a combination of superfine calcium carbonate and fiber;
wherein the median range of the particle size of the calcium carbonate particles is 5-50 μm, the diameter range of the fiber material is 1-10 μm, and the length range is 10-200 μm.
10. A method of preparing a drilling fluid system according to any one of claims 1 to 9, wherein the method comprises:
the drilling fluid system is prepared by stirring and mixing the components according to the dosage.
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| CN111205834A (en) * | 2020-01-22 | 2020-05-29 | 中国海洋石油集团有限公司 | Viscosity reducer for high-temperature and high-pressure resistant oil-based drilling fluid and preparation method thereof |
| CN116622346A (en) * | 2023-07-24 | 2023-08-22 | 天津市滨海新区大港鼎澄工贸有限公司 | Elastic inlaid shielding drilling fluid for drilling construction |
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| CN116622346A (en) * | 2023-07-24 | 2023-08-22 | 天津市滨海新区大港鼎澄工贸有限公司 | Elastic inlaid shielding drilling fluid for drilling construction |
| CN116622346B (en) * | 2023-07-24 | 2023-12-05 | 天津市滨海新区大港鼎澄工贸有限公司 | Elastic inlaid shielding drilling fluid for drilling construction |
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