CN111171225B - Preparation method of tackifying and shear strength improving agent for drilling fluid and drilling fluid - Google Patents
Preparation method of tackifying and shear strength improving agent for drilling fluid and drilling fluid Download PDFInfo
- Publication number
- CN111171225B CN111171225B CN201811338539.2A CN201811338539A CN111171225B CN 111171225 B CN111171225 B CN 111171225B CN 201811338539 A CN201811338539 A CN 201811338539A CN 111171225 B CN111171225 B CN 111171225B
- Authority
- CN
- China
- Prior art keywords
- drilling fluid
- parts
- tackifying
- improving agent
- agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C08F220/00—Copolymers 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
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- 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
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- 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
Abstract
The invention provides a preparation method of a tackifying and shear strength improving agent for drilling fluid, which comprises the following steps: adding the water phase material into the oil phase material for emulsification to obtain emulsion; and carrying out polymerization reaction on the emulsion and an initiator to obtain the viscosity-increasing and shear-improving agent for the drilling fluid. According to the invention, an inverse emulsion polymerization method is adopted, a tackifying and shear-promoting polymer with a hyperbranched structure is synthesized in a RAFT (reversible addition-fragmentation chain transfer) controllable polymerization mode, the reaction process is easy to control, and the obtained product has good temperature resistance. Compared with linear polymers, the hyperbranched polymer prepared by the invention has better dispersibility in water and lower viscosity under the same molecular weight, and the inverse emulsion polymer provided by the invention can be directly added into drilling fluid for use without being dried and crushed. Compared with powdery polymers, the inverse emulsion polymer in the invention can greatly reduce the dosage and reduce the treatment cost of the drilling fluid under the condition of achieving the same effect, and has good application prospect.
Description
Technical Field
The invention relates to the technical field of drilling fluid, in particular to a preparation method of a tackifying and shear strength improving agent for drilling fluid and the drilling fluid.
Background
The hyperbranched polymer has high branching and a large number of functional group end groups in the branches, and compared with a linear polymer with the same molecular weight, the hyperbranched polymer has the advantages of easy dissolution, low viscosity, better temperature resistance and a large number of modifiable end functional groups, and the special properties enable the hyperbranched polymer to show stronger application values in the aspects of nano materials, sewage treatment, coatings, medicines and corrosion prevention. At present, no report of the application of any hyperbranched polymer in the aspect of drilling fluid additives is found.
In the prior art, a tackifying and shear-improving agent used for drilling fluid is generally a linear macromolecule, and has a good tackifying and fluid loss reducing effect at normal temperature, but at a high temperature of more than 150 ℃, the linear structure is easy to break, and the high-temperature stability is poor, so that the tackifying and shear-improving effects are lost.
Therefore, it is an urgent problem to be solved by those skilled in the art to provide a thickening and cutting agent having good high-temperature stability.
Disclosure of Invention
In view of the above, the invention aims to provide a preparation method of a tackifying and shear strength improving agent with better high-temperature stability and drilling fluid.
The invention provides a preparation method of a tackifying and shear strength improving agent for drilling fluid, which comprises the following steps:
adding the water phase material into the oil phase material for emulsification to obtain emulsion;
and carrying out polymerization reaction on the emulsion and an initiator to obtain the viscosity-increasing and shear-improving agent for the drilling fluid.
In the invention, the water phase material comprises the following components in parts by weight:
154-176 parts of water;
44-67 parts of an organic acid monomer;
36-53 parts of an acrylamide monomer;
0.04 to 0.6 parts of a branching agent;
0.06-0.76 parts of a chain transfer agent;
0.882-4.32 parts of hydrophilic emulsifier.
In the invention, the weight part of the water is preferably 160-170 parts, more preferably 162-168 parts, and most preferably 164-166 parts. In the present invention, the water is preferably deionized water.
In the invention, the weight part of the organic acid monomer is preferably 50-60 parts, more preferably 52-58 parts, and most preferably 54-56 parts. In the invention, the organic acid monomer is preferably one or more of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and 2-acryloyloxy-2-methylpropanesulfonic acid.
In the invention, the weight part of the acrylamide monomer is preferably 40-50 parts, more preferably 42-48 parts, and most preferably 44-46 parts.
In the present invention, the weight part of the branching agent is preferably 0.1 to 0.5 parts, more preferably 0.2 to 0.4 parts, and most preferably 0.3 parts. In the present invention, the branching agent is preferably divinylbenzene or polyethylene glycol diacrylate.
In the present invention, the weight part of the chain transfer agent is preferably 0.1 to 0.7 part, more preferably 0.2 to 0.6 part, and most preferably 0.3 to 0.5 part. In the present invention, the chain transfer agent is preferably 3-benzylmercaptothiocarbonylpropanic acid or 4-cyanovaleric acid dithiobenzoate.
In the invention, the weight part of the hydrophilic emulsifier is preferably 1-4 parts, more preferably 2-3 parts, and most preferably 2.5 parts. In the present invention, the hydrophilic emulsifier preferably includes one or more of polyoxyethylene sorbitan monooleate (tween 80), polyoxyethylene sorbitan monostearate (tween 60) and octylphenol polyoxyethylene ether (OP-15).
In the invention, the oil phase material comprises the following components in parts by weight based on water:
101-115 parts of base oil;
7.938-10.08 parts of lipophilic emulsifier.
In the invention, the weight part of the base oil is preferably 105-110 parts, and more preferably 106-108 parts. In the present invention, the base oil is preferably a white oil, more preferably a polymer grade white oil, and most preferably a No. 2 polymer grade white oil, known in the art as No. 2 white oil, commercially available.
In the present invention, the lipophilic emulsifier is preferably 8 to 10 parts, and more preferably 9 parts. In the present invention, the lipophilic emulsifier preferably includes one or more of sorbitan trioleate (SP-85), sorbitan fatty acid ester (SP-80) and sorbitan stearate (SP-60).
In the invention, the emulsifying speed is preferably 13000-15000 rpm, more preferably 13500-14500 rpm, and most preferably 140000 rpm. In the invention, the emulsifying time is preferably 5-15 min, more preferably 8-12 min, and most preferably 10 min.
In the invention, the preparation method of the tackifying and shearing-promoting agent for drilling fluid is preferably as follows:
and mixing the emulsion and an initiator, standing, and performing polymerization reaction to obtain the viscosity-increasing shear strength improving agent for the drilling fluid.
In the invention, the weight portion of the initiator is preferably 0.08 to 0.36 part, more preferably 0.1 to 0.3 part, more preferably 0.15 to 0.25 part, and most preferably 0.2 part based on the weight portion of water in the emulsion. In the invention, the initiator is preferably one or more of azo initiators and redox initiators. In the present invention, the azo-based initiator preferably includes azobisisobutyronitrile, azobisisobutylamidine hydrochloride. In the present invention, the redox initiator is a complex system composed of a peroxide and a reducing agent. In the present invention, the peroxide preferably includes ammonium persulfate or potassium persulfate. In the present invention, the reducing agent preferably includes sodium bisulfite or sodium sulfite.
In the invention, the mixing temperature is preferably 20-30 ℃, more preferably 22-28 ℃, and most preferably 24-26 ℃.
In the invention, the polymerization reaction temperature is preferably 35-60 ℃, more preferably 40-55 ℃, and most preferably 45-50 ℃. In the present invention, the time for the polymerization reaction is preferably 5 to 10 hours, more preferably 6 to 9 hours, and most preferably 7 to 8 hours.
The method provided by the invention prepares the inverse emulsion hyperbranched polymer treating agent for the drilling fluid. According to the invention, an inverse emulsion polymerization method is adopted, a tackifying and shear-promoting polymer with a hyperbranched structure is synthesized in a RAFT (reversible addition-fragmentation chain transfer) controllable polymerization mode, the reaction process is easy to control, and the obtained product has good temperature resistance. Compared with linear polymers, the hyperbranched polymer prepared by the invention has better dispersibility in water and lower viscosity under the same molecular weight, and the inverse emulsion polymer provided by the invention can be directly added into drilling fluid for use without being dried and crushed. Compared with powdery polymers, the inverse emulsion polymer in the invention can greatly reduce the dosage and reduce the treatment cost of the drilling fluid under the condition of achieving the same effect, and has good application prospect.
The viscosity-increasing and shear-improving agent provided by the invention solves the problems that linear polymers used in drilling fluid treating agents in the prior art are insufficient in salt resistance and calcium resistance, degraded at high temperature, low in molecular fracture viscosity retention rate and the like, and fully exerts the advantages of high branching degree, short branched chains, strong shear resistance and mutual protection of the branched chains of hyperbranched polymers, so that the temperature resistance of the hyperbranched polymers is improved; the enhanced shear strength agent provided by the invention is a hyperbranched polymer, has high branching degree and high radical density, easily forms a structure between chains, and improves shear strength.
The invention provides a tackifying and shearing type inverse emulsion hyperbranched polymer treating agent, which is an inverse emulsion hyperbranched polymer for drilling fluid. The hyperbranched polymer is synthesized by the reverse emulsion polymerization and RAFT (reversible addition-fragmentation chain transfer) controllable polymerization methods, has higher branching degree, terminal group adsorption groups and short branched chains, has better shear-promoting and tackifying effects in drilling fluid, has good effects on gum protection and fluid loss reduction, and particularly has good application prospects in the field of high-temperature deep well drilling.
The invention also provides a drilling fluid which comprises the tackifying and shear strength improving agent for the drilling fluid. The invention is not particularly limited with respect to other components of the drilling fluid, and one skilled in the art can select the components of the drilling fluid according to the actual drilling fluid required. In the present invention, the drilling fluid is preferably a polysulfonate drilling fluid system, the drilling fluid preferably comprising:
base slurry;
a viscosity-increasing and cutting-improving agent for drilling fluid;
sulfonated lignite (SMC);
sulfonated phenolic resins (SMP-3);
sodium hydroxide;
potassium chloride;
barite.
In the present invention, the base slurry preferably has the following composition: water, soda ash and bentonite.
In the invention, the mass content of the soda ash in the base slurry is preferably 0.2-0.4%, and more preferably 0.3%.
In the present invention, the bentonite is preferably sodium bentonite. In the present invention, the mass content of bentonite in the base slurry is preferably 3 to 5%, more preferably 3.5 to 4.5%, and most preferably 4%.
In the present invention, the preparation method of the base slurry is preferably:
mixing and stirring water, soda ash and sodium bentonite for 8 hours, and standing for 48 hours at room temperature.
In the invention, the mass content of the tackifying and shearing enhancing agent for the drilling fluid in the drilling fluid is preferably 1.0-2.0%, more preferably 1.3-1.7%, and most preferably 1.5%.
In the invention, the mass content of the SMC in the drilling fluid is preferably 4-6%, more preferably 4.5-5.5%, and most preferably 5%.
In the invention, the mass content of the SMP-3 in the drilling fluid is preferably 4-6%, more preferably 4.5-5.5%, and most preferably 5%.
In the invention, the mass content of the sodium hydroxide in the drilling fluid is preferably 0.05-0.3%, more preferably 0.1-0.2%, and most preferably 0.15%.
In the invention, the mass content of the potassium chloride in the drilling fluid is preferably 3-7%, more preferably 4-6%, and most preferably 5%.
In the invention, the mass content of the barite in the drilling fluid is preferably 150-200%, more preferably 160-180%, and most preferably 170%.
The viscosity retention rate of a polymer solution, the filtrate loss reduction performance in the composite brine slurry and the drilling fluid performance of a polysulfonate drilling fluid system are evaluated by using the tackifying and cutting agent for the drilling fluid prepared by the method provided by the invention.
Preparation of polymer solution and determination of viscosity retention:
4g of the tackifying, shear-type and hyperbranched polymer for drilling fluid prepared by the method provided by the invention is added into 400mL of deionized water, and the mixture is kept stand and cured for 24 hours. According to GB/T16783.1-2006 part 1 of the field test of the oil and gas industrial drilling fluid: determination of the apparent viscosity C at Room temperature according to the provisions of 6.3 in Water-based drilling fluids1Loading the measured solution into a high-temperature aging kettle, aging at 150 ℃/16h, taking out, cooling to room temperature, and measuring the apparent viscosity C after aging according to the apparent viscosity test method2The viscosity retention was calculated according to the following formula:
viscosity retention rate ═ C1/C2)*100％。
Preparation of composite brine slurry and measurement of filtration loss:
according to Standard Q/SH 10250523-2008 "general technical Condition for synthetic polymers for drilling fluids": weighing 350mL of distilled water, placing the distilled water in a cup, adding 16.0g of sodium chloride, 2.6g of anhydrous calcium chloride and 6.9g of magnesium chloride, adding 52.5g of calcium bentonite and 3.15g of anhydrous sodium carbonate after the sodium chloride is dissolved, stirring at a high speed for 20min, stopping at least twice during the stirring, scraping the clay adhered to the wall of the container, and carrying out closed maintenance at 24 +/-3 ℃ for 24 hours to prepare the composite brine base slurry.
Adding the prepared tackifying and cutting agent for the drilling fluid into the composite saline water base slurry according to 1.5 mass percent, stirring for 20min at a high speed, and measuring the rheological property and the filtration loss at normal temperature; then aging at 150 deg.C/16 h, taking outStirring for 5 min. Determining rheological property according to the specification of 6.3 in GB/T16783.1-2006 part 1 of on-site test of petroleum and natural gas industrial drilling fluid and water-based drilling fluid; apparent viscosity, AV, in mpa.s; plastic viscosity PV, in mpa.s; dynamic shear force YP; initial/final cut Q10s/Q10min(ii) a API filtration loss FL was measured as specified in 7.2API。
Preparing the polysulfonate drilling fluid and evaluating the performance:
measuring 300mL of pre-hydration base slurry with the mass concentration of 4% (the pre-hydration base slurry consists of 4 wt% of sodium bentonite, 0.3 wt% of sodium carbonate and water), and stirring for 5min at high speed; adding a viscosity-increasing and cutting-extracting agent accounting for 1.5 percent of the mass fraction into the prehydrated base slurry, and stirring for 5min at a high speed; then SMC with the mass fraction of 5 percent, SMP-3 with the mass fraction of 5 percent and sodium hydroxide with the mass fraction of 0.1 percent are weighed and added into the base slurry to be stirred for 10 min; adding 5% by mass of potassium chloride, and stirring for 5 min; finally, 170% barite is added and stirred for 20min to prepare the product with the density of 1.8g/cm3The water-based drilling fluid.
According to GB/T16783.2-2012' petroleum and natural gas industry drilling fluid field test part 1: and (4) evaluating the room-temperature rheological property of the polysulfonate drilling fluid in the water-based drilling fluid. And then putting the prepared drilling fluid into a high-temperature aging kettle, placing the high-temperature aging kettle in a roller furnace at 135-200 ℃ for rolling for 16 hours, and then according to GB/T16783.2-2012 part 1 of the field test of the drilling fluid in the petroleum and natural gas industry: and (4) evaluating the rheological property and the filtrate loss reduction performance of the polysulfonate drilling fluid in the water-based drilling fluid. Rheological and fluid loss properties include: apparent viscosity AV, in mpa.s; plastic viscosity PV, in mpa.s; dynamic shear force YP; initial/final cut Q10s/Q10min(ii) a Medium pressure fluid loss FLAPI。
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention.
Example 1
176g of water was added to the reaction vessel, stirring was started, 24g of acrylic acid and 20g of 2-acrylamido-2-methylpropanesulfonic acid, 36g of acrylamide, 0.08g of divinylbenzene, 0.225g of 3-benzylmercaptothiocarbonylpropanic acid and 1.15g of Tween 80 were added, and then the pH of the system was adjusted to 7.0 with a sodium hydroxide solution having a mass concentration of 30% to obtain an aqueous phase.
Adding 115g of white oil and 10.35g of span-80 into a reaction kettle, and stirring until the white oil and the span-80 are completely dissolved to obtain an oil phase.
Slowly adding the obtained water phase into the oil phase under stirring, stirring for 30min, and emulsifying at high speed of 14000rpm for 10min to obtain emulsion.
And (3) putting the emulsion into a reaction kettle, heating to 35 ℃, introducing nitrogen for 30min, sequentially adding 0.16g of ammonium persulfate and 0.16g of sodium bisulfite, stirring for 10min, stopping stirring, standing, and reacting at constant temperature for 8 hours to obtain the viscosity-increasing and shear-improving agent for the drilling fluid.
The viscosity increasing and cutting agent solution for the drilling fluid prepared in the embodiment 1 of the invention with different concentrations is prepared, the viscosity increases slowly along with the increase of the solution concentration, the viscosity curve is smoother, and the viscosity characteristic is different from the viscosity characteristic of a linear polymer solution, so that the product prepared in the embodiment 1 of the invention forms a hyperbranched structure.
The same monomer raw materials and dosage proportion as those of the monomer raw materials in the embodiment 1 of the invention are adopted to prepare the linear polymer tackifying and cutting agent in the comparative example by an aqueous solution polymerization method:
in the preparation process of the linear polymer, an RAFT (reversible addition-fragmentation chain transfer) agent is not added, and the proportion of other raw materials, the addition of an initiator, the temperature and the synthesis process are the same.
The viscosity retention rate of a polymer solution with the mass concentration of 1% prepared from the viscosity increasing and cutting agent for drilling fluid in the embodiment 1 and the comparative example of the invention is tested according to the method in the technical scheme, and the test results are shown in table 1.
TABLE 1 viscosity retention of viscosifying and shear strength enhancing agents for drilling fluids prepared according to example 1 of the present invention and comparative example 1
As can be seen from Table 1, the products prepared in example 1 and comparative example 1 are degraded to different degrees after being aged at high temperature, the viscosity retention rate of the linear polymer is 4.7%, the viscosity retention rate of the product prepared in example 1 is 85%, and the hyperbranched polymer prepared in the invention has good temperature resistance.
Example 2
154g of water was charged into the reaction vessel, stirring was started, 67g of 2-acryloyloxy-2-methylpropanesulfonic acid, 53g of acrylamide, 0.12g of divinylbenzene, 0.34g of 4-cyanovaleric acid dithiobenzoate and 2.52g of Tween 60 were added, and then the pH of the system was adjusted to 8.0 with a 30% sodium hydroxide solution by mass to obtain an aqueous phase.
Adding 101g of white oil and 10.08g of span-60 into a reaction kettle, and stirring until all the white oil and the span-60 are dissolved to obtain an oil phase.
Slowly adding the obtained water phase into the oil phase under stirring, stirring for 30min, and emulsifying at high speed of 14000rpm for 10min to obtain emulsion.
And (3) putting the emulsion into a reaction kettle, heating to 60 ℃, introducing nitrogen for 30min, adding 0.18g of peroxide initiation system ammonium persulfate, stirring for 10min, stopping stirring, standing, reacting at constant temperature for 8 hours, and thus obtaining the tackifying and shearing agent for drilling fluid.
Comparative example linear polymer tackifying and cutting agents were prepared as described in example 1 (starting materials for preparation and process conditions were the same as in example 2).
According to the method of the technical scheme, the tackifying and shearing agent for drilling fluid prepared in the embodiment 2 and the comparative example of the invention is added into the composite brine slurry and the performance of the tackifying and shearing agent is tested, and the test results are shown in table 2.
Table 2 properties of composite brine-based slurries prepared according to the present invention in example 2 and comparative example 2
As can be seen from Table 2, the hyperbranched polymer prepared by the invention still has higher apparent viscosity after high-temperature aging in the composite salt water slurry, and the API (American petroleum institute) fluid loss is 8.6 mL; the linear polymer of the comparative example has larger reduction range of apparent viscosity after high-temperature aging, the API filtration loss is rapidly increased, and the tackifying and cutting-improving agent for the drilling fluid prepared by the invention has good salt resistance and filtration loss reduction performance.
Example 3
Adding 165g of water into a reaction kettle, starting stirring, adding 56g of 2-acrylamido-2-methylpropanesulfonic acid, 44g of acrylamide, 0.15g of diacrylate polyethylene glycol ester, 0.281g of 4-cyanovaleric acid dithiobenzoate and 2.7g of octylphenol polyoxyethylene ether, and then adjusting the pH value of the system to 9.0 by using a sodium hydroxide solution with the mass concentration of 30% to obtain an aqueous phase.
108g of white oil and 10.8g of span-85 are added into a reaction kettle and stirred until the white oil and the span-85 are completely dissolved, so as to obtain an oil phase.
Slowly adding the obtained water phase into the oil phase under stirring, stirring for 30min, and emulsifying at high speed of 14000rpm for 10min to obtain emulsion.
And (3) putting the emulsion into a reaction kettle, heating to 35 ℃, introducing nitrogen for 30min, adding 0.2g of azobisisobutyronitrile, stirring for 10min, stopping stirring, standing, reacting at constant temperature for 10 hours, and thus obtaining the viscosity-increasing and shear-improving agent for drilling fluid.
Comparative example linear polymer tackifying and cutting agents were prepared according to the method of example 1 (the preparation raw materials and the synthesis process were the same as in example 3).
According to the method of the technical scheme, the tackifying and cutting-improving agent prepared in the embodiment 3 and the comparative example of the invention is added into the polysulfonate drilling fluid, and the performance of the tackifying and cutting-improving agent is tested, as shown in table 3.
Table 3 properties of polysulfonate drilling fluids prepared in inventive example 3 and comparative example 3
As can be seen from Table 3, the shear force is relatively large after the hyperbranched polymer product with 2.0 percent is added and aged at high temperature, and the product prepared by the method has a good tackifying and shear-improving effect in the drilling fluid after being aged at high temperature, so that the filtration loss of the drilling fluid can be effectively controlled, and the high-temperature stability of the drilling fluid is improved. After the drilling fluid is aged, the bottom of the drilling fluid added with the product of the comparative example is settled, the dynamic shear force and the initial and final cutting of the drilling fluid added with the product prepared by the invention are kept better, and the product prepared by the invention has good temperature resistance and rubber protection capability.
Example 4
165g of water is added into a reaction kettle, stirring is started, 56g of 2-acryloyloxy-2-methylpropanesulfonic acid, 44g of acrylamide, 0.6g of diacrylate polyethylene glycol ester, 0.76g of 3-benzylmercaptothiocarbonylpropanic acid and 3.24g of Tween 80 are added, and then the pH value of the system is adjusted to 7.5 by using a sodium hydroxide solution with the mass concentration of 30% to obtain an aqueous phase.
108g of white oil and 7.56g of span-60 are added into a reaction kettle and stirred until the white oil and span-60 are completely dissolved, so as to obtain an oil phase.
Slowly adding the obtained water phase into the oil phase under stirring, stirring for 30min, and emulsifying at high speed of 14000rpm for 10min to obtain emulsion.
And (3) putting the emulsion into a reaction kettle, heating to 35 ℃, introducing nitrogen for 30min, adding 0.36g of azodiisobutyl amidine hydrochloride, stirring for 10min, stopping stirring, standing, and reacting at constant temperature for 5 hours to obtain the tackifying and cutting agent for the drilling fluid.
Comparative example linear polymer tackifying and cutting agents were prepared as described in example 1 (raw materials for preparation and synthesis process were the same as in example 4).
According to the method of the technical scheme, the tackifying and cutting-improving agent prepared in the embodiment 4 and the comparative example of the invention is added into the polysulfonate drilling fluid, and the performance of the tackifying and cutting-improving agent is tested, as shown in table 4.
Table 4 properties of polysulfonate drilling fluids prepared in inventive example 4 and comparative example 4
As shown in Table 4, the viscosity and shear strength of the hyperbranched polymer after high-temperature aging were maintained at room temperature at the same amount of the polymer treating agent. After the viscosity-increasing shear strength agent prepared by the invention is added after high-temperature aging, the dynamic shear strength of the drilling fluid is 19, while the dynamic shear strength of the drilling fluid of the comparative example is 3, and the system shear strength of the polymer of the comparative example is obviously reduced due to degradation and gel protection capability at high temperature, so that the aged drilling fluid is settled. The product prepared by the method provided by the invention has good tackifying and cutting effects and temperature resistance.
From the above embodiments, the present invention provides a preparation method of a viscosity-increasing shear strength improving agent for drilling fluid, comprising: adding the water phase material into the oil phase material for emulsification to obtain emulsion; and carrying out polymerization reaction on the emulsion and an initiator to obtain the viscosity-increasing and shear-improving agent for the drilling fluid. According to the invention, an inverse emulsion polymerization method is adopted, a tackifying and shear-promoting polymer with a hyperbranched structure is synthesized in a RAFT (reversible addition-fragmentation chain transfer) controllable polymerization mode, the reaction process is easy to control, and the obtained product has good temperature resistance. Compared with linear polymers, the hyperbranched polymer prepared by the invention has better dispersibility in water and lower viscosity under the same molecular weight, and the inverse emulsion polymer provided by the invention can be directly added into drilling fluid for use without being dried and crushed. Compared with powdery polymers, the inverse emulsion polymer in the invention can greatly reduce the dosage and reduce the treatment cost of the drilling fluid under the condition of achieving the same effect, and has good application prospect.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A preparation method of a tackifying and shear strength improving agent for drilling fluid comprises the following steps:
adding the water phase material into the oil phase material for emulsification to obtain emulsion;
carrying out polymerization reaction on the emulsion and an initiator to obtain a tackifying and shearing-improving agent for the drilling fluid;
the water phase materials comprise the following components in parts by weight:
154-176 parts of water;
44-67 parts of an organic acid monomer;
36-53 parts of an acrylamide monomer;
0.04 to 0.6 parts of a branching agent;
0.06-0.76 parts of a chain transfer agent;
0.882-4.32 parts of hydrophilic emulsifier;
the oil phase material takes the weight part of water as a reference and comprises the following components:
101-115 parts of base oil;
7.938-10.08 parts of lipophilic emulsifier; the organic acid monomer is one or more of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and 2-acryloxy-2-methylpropanesulfonic acid.
2. The method of claim 1, wherein the branching agent is divinylbenzene or polyethylene glycol diacrylate.
3. The method of claim 1, wherein the chain transfer agent is 3-benzylmercaptothiocarbonylpropanic acid or 4-cyanovaleric acid dithiobenzoate.
4. The method of claim 1, wherein the hydrophilic emulsifier comprises one or more of polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan monostearate, and octylphenol polyoxyethylene ether.
5. The method of claim 1, wherein the lipophilic emulsifier comprises one or more of sorbitan trioleate, sorbitan fatty acid ester and sorbitan stearate.
6. The method according to claim 1, wherein the initiator is one or more of azo type initiator and redox type initiator.
7. The method of claim 1, wherein the base oil is a white oil.
8. The method according to claim 1, wherein the temperature of the polymerization reaction is 35 to 60 ℃; the time of the polymerization reaction is 5-10 hours.
9. A drilling fluid comprising the viscosifying and shear strength improving agent for drilling fluid prepared by the method of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811338539.2A CN111171225B (en) | 2018-11-12 | 2018-11-12 | Preparation method of tackifying and shear strength improving agent for drilling fluid and drilling fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811338539.2A CN111171225B (en) | 2018-11-12 | 2018-11-12 | Preparation method of tackifying and shear strength improving agent for drilling fluid and drilling fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111171225A CN111171225A (en) | 2020-05-19 |
| CN111171225B true CN111171225B (en) | 2022-05-13 |
Family
ID=70646109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811338539.2A Active CN111171225B (en) | 2018-11-12 | 2018-11-12 | Preparation method of tackifying and shear strength improving agent for drilling fluid and drilling fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111171225B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316121B (en) * | 2022-02-24 | 2023-02-17 | 重庆威能钻井助剂有限公司 | Branched zwitterionic polymer diluent for drilling fluid and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101037492A (en) * | 2007-03-28 | 2007-09-19 | 中国石油大学(华东) | Method for preparing propylene amides copolymer with regular branch structure by inverse emulsion method |
| CN102040707A (en) * | 2009-10-23 | 2011-05-04 | 中国石油化工股份有限公司 | Zwitterionic polymer and preparation method thereof |
| WO2012061147A1 (en) * | 2010-10-25 | 2012-05-10 | Isp Investments Inc. | Salt-tolerant, thermally-stable rheology modifiers |
| CN104829781A (en) * | 2015-04-03 | 2015-08-12 | 蒋官澄 | Water-based tackifying and shear strength improving agent for drilling fluids, and preparation method thereof |
-
2018
- 2018-11-12 CN CN201811338539.2A patent/CN111171225B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101037492A (en) * | 2007-03-28 | 2007-09-19 | 中国石油大学(华东) | Method for preparing propylene amides copolymer with regular branch structure by inverse emulsion method |
| CN102040707A (en) * | 2009-10-23 | 2011-05-04 | 中国石油化工股份有限公司 | Zwitterionic polymer and preparation method thereof |
| WO2012061147A1 (en) * | 2010-10-25 | 2012-05-10 | Isp Investments Inc. | Salt-tolerant, thermally-stable rheology modifiers |
| CN104829781A (en) * | 2015-04-03 | 2015-08-12 | 蒋官澄 | Water-based tackifying and shear strength improving agent for drilling fluids, and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 半连续RAFT反相乳液聚合制备支化聚丙烯酰胺;郭含培;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》;20140415(第04期);第B016-89页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111171225A (en) | 2020-05-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10023782B2 (en) | Salt-tolerant, thermally-stable rheology modifiers | |
| AU2002322676B2 (en) | Hydrophobe associative polymers and compositions and methods employing them | |
| CN112300771B (en) | Composition for oil and gas production | |
| RU2263683C2 (en) | Method of producing hydrophobic associative polymer | |
| EP0309629B1 (en) | Terpolymers containing sulfonate functionality and process for their preparation. | |
| US4694046A (en) | Hydrophobically associating terpolymers of acrylamide, salts of acrylic acid and alkyl acrylamide | |
| AU2014253058B2 (en) | Fracturing fluids based on associative polymers and on labile surfactants | |
| CN101775275B (en) | Novel viscoelastic particle oil displacement agent and preparation method thereof | |
| CN112898488B (en) | Polysaccharide modified salt-resistant resistance-reducing agent for shale gas fracturing fluid and preparation method thereof | |
| WO2013138156A1 (en) | Synthesis and application of high pressure high temperature fluid loss additive and rheology stabilizer | |
| WO2013162902A1 (en) | Synergistic combination of a fluid loss additive and rheology modifier | |
| CN103254366B (en) | Preparation method and application of polyoxyethylene-based polymer filtrate reducer | |
| CN110066647B (en) | High-temperature-resistant air-stagnation plug for well drilling and preparation method thereof | |
| CN107629768B (en) | Ultrahigh-temperature-resistant water-based drilling fluid | |
| CN111171225B (en) | Preparation method of tackifying and shear strength improving agent for drilling fluid and drilling fluid | |
| CN111171224A (en) | Hyperbranched polymer, preparation method thereof and application thereof in preparation of drilling fluid | |
| CN110950995B (en) | Low-molecular thickening agent for drilling fluid and preparation method thereof | |
| CN111171226B (en) | Preparation method of water-soluble filtrate reducer for drilling fluid and drilling fluid | |
| CN113372516B (en) | Thickener ultrafine powder, giant arm type thickener, preparation method and application thereof | |
| KR20160123643A (en) | High heat-resistance and high-viscosity water soluble polymer and manufacturing method of High-viscosity solution therefrom | |
| KR20150137601A (en) | High-viscosity water soluable polymer and manufacturing method of High-viscosity solution therefrom | |
| CN114032081A (en) | Novel composition for oil and gas recovery | |
| JP4277124B2 (en) | Drilling mud additive and drilling mud using the same | |
| GB2213850A (en) | Enhanced oil recovery process | |
| CN116063623A (en) | Preparation method of hyperbranched polymer for drilling fluid and drilling fluid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |