CN111499790A - High-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid and preparation method thereof - Google Patents
High-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid and preparation method thereof Download PDFInfo
- Publication number
- CN111499790A CN111499790A CN202010354860.0A CN202010354860A CN111499790A CN 111499790 A CN111499790 A CN 111499790A CN 202010354860 A CN202010354860 A CN 202010354860A CN 111499790 A CN111499790 A CN 111499790A
- Authority
- CN
- China
- Prior art keywords
- parts
- monomer
- water
- plugging agent
- drilling fluid
- 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.)
- Granted
Links
Images
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
- 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
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Dispersion Chemistry (AREA)
- Polymerisation Methods In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention provides a high-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid, which comprises the following raw materials in parts by weight: 7-20 parts of vinyl monomer with strong adsorption group, 0.5-2 parts of cationic monomer, 1-4 parts of branched monomer, 2-5 parts of emulsifier, 15-30 parts of styrene, 5-10 parts of acrylate hydrophobic monomer, 1-3 parts of organosilicon monomer, 0.1-0.5 part of initiator and 150 parts of water 100 and the like. The polymer microsphere nano plugging agent disclosed by the invention is completely dispersed in water, has higher temperature resistance and excellent plugging effect, can greatly reduce the filtration loss and high-pressure filtration loss of drilling fluid under normal temperature and high temperature conditions, and is suitable for plugging deep stratum shale stratum.
Description
Technical Field
The invention relates to a high-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid and a preparation method thereof, belonging to the field of oilfield chemistry in the petroleum industry.
Background
In the drilling process, the instability of the well wall can cause a series of underground complex conditions such as collapse, block falling, necking and the like of the well wall, and the safety and the efficiency of the drilling engineering are seriously restricted. Most of shale formations are compact, microcracks and micropores develop, the permeability is low, and an effective filter cake is difficult to form in the drilling process, so that the invasion of drilling fluid is difficult to prevent. Pressure transfer in the nanopores is one of the causes of borehole wall instability. For shale stratum, the effective plugging of stratum nano-scale pores is an important measure for stabilizing the well wall.
The commonly used drilling fluid plugging agents (bridging type, polymer type and asphalt type) have large particle size, usually in the micron to millimeter level, and cannot plug the pores of the formation in the nanometer level. Common inorganic nano materials, such as nano silicon dioxide, nano calcium carbonate and nano ferric oxide, have large specific surface area, are easy to agglomerate in water and difficult to disperse, so that the particle size is too large, and the nano pores cannot be effectively blocked; the common polymer nano plugging agent is easy to decompose at high temperature and cannot keep nano-scale granularity, so that the use of the nano plugging agent at high temperature is restricted. Chinese patent document CN107915798A provides a polymer nano plugging agent for water-based drilling fluid and a preparation method thereof, and the polymer nano plugging agent for water-based drilling fluid comprises the following components in parts by weight: 4-16 parts of emulsifier, 2-14 parts of temperature sensitive monomer, 10-53 parts of hydrophilic monomer, 0.5-10 parts of hydrophobic monomer and 0.05-0.5 part of initiator. However, the preparation of the nano blocking agent requires that a monomer and an emulsifier are mixed in an organic solvent to prepare a pre-emulsion, a certain content of the organic solvent exists in a product after the reaction is finished, and the pre-emulsion is not beneficial to the environmental protection of the drilling fluid after the organic solvent is added into the water-based drilling fluid.
At present, the existing water-based drilling fluid nano plugging agent mainly has the following defects: (1) the specific surface area is large, and the polymer is easy to aggregate and settle in water and cannot be dispersed for a long time; (2) the conventional nano plugging agent has small acting force with rocks, is difficult to reside in pores and has poor plugging effect; (3) the temperature resistance is poor, the polymer is easy to decompose and lose efficacy under the high-temperature condition, and the plugging of a high-temperature deep stratum cannot be completed.
Therefore, it is necessary to develop a high temperature resistant polymer plugging agent with good dispersibility in water, higher temperature resistance and excellent plugging effect. The invention is therefore proposed.
Disclosure of Invention
Aiming at the defects of the prior art, in particular to the defects of poor dispersibility, poor plugging property and poor high temperature resistance of the existing nano plugging agent, the invention provides a high temperature resistant polymer microsphere nano plugging agent for water-based drilling fluid and a preparation method thereof. The polymer microsphere nano plugging agent disclosed by the invention is completely dispersed in water, has high temperature resistance and excellent plugging effect, and is suitable for plugging deep stratum shale stratum.
The technical scheme of the invention is as follows:
a high-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid comprises the following raw materials in parts by weight: 7-20 parts of vinyl monomer with strong adsorption group, 0.5-2 parts of cationic monomer, 1-4 parts of branched monomer, 2-5 parts of emulsifier, 15-30 parts of styrene, 5-10 parts of acrylate hydrophobic monomer, 1-3 parts of organosilicon monomer, 0.1-0.5 part of initiator and 150 parts of water 100 and the like.
According to the invention, preferably, the high-temperature resistant polymer microsphere nano plugging agent for the water-based drilling fluid comprises the following raw materials in parts by weight: 10-15 parts of vinyl monomer with strong adsorption groups, 1-2 parts of cationic monomer, 2-3 parts of branched monomer, 2-3 parts of emulsifier, 15-25 parts of styrene, 5-8 parts of acrylate hydrophobic monomer, 1-2 parts of organosilicon monomer, 0.1-0.3 part of initiator and 120 parts of water.
According to the present invention, preferably, the vinyl monomer with a strong adsorption group is two or three of acrylamide, 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) and N-dodecylacrylamide;
more preferably, the vinyl monomer with the strong adsorption group is a combination of acrylamide and 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), and the mass ratio of the acrylamide to the 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) is 1: 0.2-0.5.
According to the present invention, preferably, the cationic monomer is one or a combination of two of dimethyldiallylammonium chloride (DMDAAC), methacryloyloxyethyltrimethyl ammonium chloride (DMC) and acryloyloxyethyltrimethyl ammonium chloride (DAC).
According to the present invention, preferably, the branched monomer is one of bismaleimide, divinylbenzene and ethylene glycol dimethacrylate.
According to the invention, the emulsifier is preferably a reactive emulsifier MS-1.
According to the invention, preferably, the acrylate hydrophobic monomer is one or a combination of more than two of butyl acrylate, ethyl acrylate and dodecyl acrylate.
According to the invention, preferably, the organosilicon monomer is one or two of octamethylcyclotetrasiloxane, hexamethylcyclotrisiloxane, hexamethyldisiloxane and hydroxyl silicone oil; the viscosity of the hydroxyl silicone oil is 20mm2(ii)/s, hydroxyl group molar fraction of 7%, acid value of 0.15mg KOH/g.
According to the invention, preferably, the initiator is one of ammonium persulfate, potassium persulfate, hydrogen peroxide, dibenzoyl peroxide and azobisisobutyronitrile.
According to the invention, the preparation method of the high-temperature-resistant polymer microsphere nano plugging agent for the water-based drilling fluid comprises the following steps:
(1) adding a vinyl monomer with a strong adsorption group, a cationic monomer, a branched monomer and an emulsifier into water, uniformly mixing, and adjusting the pH of a system to 6.0-8.0 to obtain a solution;
(2) uniformly mixing styrene, an acrylate hydrophobic monomer and an organic silicon monomer, adding the mixture into the solution obtained in the step (1), and emulsifying to obtain an emulsion;
(3) deoxidizing the emulsion obtained in the step (2) with nitrogen for 20min, heating to 65-90 ℃, adding an initiator, and reacting; and after the reaction is finished, naturally cooling to room temperature to obtain the high-temperature-resistant polymer microsphere nano plugging agent.
According to the invention, it is preferred that in step (1) a sodium hydroxide solution with a mass concentration of 20 wt% is used to adjust the pH of the system.
According to the present invention, preferably, the emulsification in step (2) is emulsification using a shear emulsifier, and the rotation speed of the shear emulsifier is 1500-.
According to the invention, preferably, when the initiator in the step (3) is ammonium persulfate or potassium persulfate, the initiator is dropwise added in the form of an initiator aqueous solution, the mass concentration of the initiator aqueous solution is 0.1g/m L, and when the initiator is hydrogen peroxide, dibenzoyl peroxide or azobisisobutyronitrile, the initiator is directly added into the reaction system.
According to the present invention, it is preferred that the reaction time in step (3) is 4 to 8 hours.
According to the invention, the high-temperature resistant polymer microsphere nano plugging agent for the water-based drilling fluid is white viscous emulsion.
The invention has the following technical characteristics and beneficial effects:
1. the nano plugging agent adopts a micelle polymerization mode to synthesize the polymer microsphere nano plugging agent. The nano blocking agent reaction monomer is formed by combining a lipophilic monomer and a hydrophilic monomer, and the proportion of the lipophilic monomer and the hydrophilic monomer is adjusted, so that the blocking agent has a certain softening point and is easy to disperse; the vinyl monomer, the cationic monomer and the organic silicon monomer containing chemical groups with strong adsorption with rocks are added, the acting force of the nano blocking agent and the rocks is increased, and the blocking capability of the nano blocking agent is improved through the introduced amide groups, sulfonic acid groups, cationic groups, silicon-oxygen groups and the like; high temperature resistant monomers (styrene, AMPS) and branched monomers are added to improve the temperature resistance, prevent the nanometer plugging agent from high temperature decomposition and improve the high temperature resistance of the plugging agent.
2. The introduction of hydrophilic monomers such as vinyl monomers, cationic monomers and branched monomers with strong adsorption groups in the nano plugging agent enables the polymer nanoparticles to have strong hydrophilicity, easy dispersion and good dispersibility, and can not be agglomerated or settled after long-term storage; meanwhile, due to the introduction of lipophilic monomers such as styrene, acrylate hydrophobic monomers, organic silicon monomers and the like, the plugging agent has a certain softening point, can be compressed and deformed, and improves the plugging capability of the nano plugging agent.
3. The nano plugging agent of the invention is high temperature resistant, the high temperature resistant monomer (styrene, etc.) and the branched monomer are added, so that the plugging agent is difficult to decompose at high temperature, the temperature resistance is excellent, and the nano plugging agent can resist the high temperature of 220 ℃.
4. The nano plugging agent has a plurality of adsorption sites, strong adsorption groups in the vinyl monomer, and both the cationic monomer and the organosilicon monomer can improve the binding force between the plugging agent and the stratum, so that the nano plugging agent has super-strong adsorption.
5. The nano plugging agent has excellent plugging performance, and can greatly reduce the filtration loss and the high-pressure filtration loss of the drilling fluid under the conditions of normal temperature and high temperature.
Drawings
FIG. 1 is a scanning electron microscope image of the high temperature resistant polymer microsphere nano plugging agent for water-based drilling fluid prepared in example 1.
Detailed Description
The present invention is further illustrated by, but not limited to, the following examples.
The raw materials used in the examples are conventional raw materials and can be obtained commercially; the methods are prior art unless otherwise specified.
Example 1
A preparation method of a high-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid comprises the following steps:
(1) adding 10g of acrylamide, 3g of 2-acrylamide-2-methylpropanesulfonic acid, 2g of methacryloyloxyethyl trimethyl ammonium chloride, 3g of bismaleimide and 3g of reactive emulsifier MS-1 into 100g of water, and uniformly mixing; and adjusting the pH of the system to 7.0 by using a sodium hydroxide solution with the mass concentration of 20 wt% to obtain a solution.
(2) Uniformly mixing 20g of styrene, 5g of butyl acrylate and 2g of hexamethylcyclotrisiloxane, and adding the mixture into the solution obtained in the step (1); emulsifying by using a shearing emulsifying machine, wherein the rotating speed of the shearing emulsifying machine is 2000r/min, and obtaining the emulsion.
(3) And (3) transferring the emulsion obtained in the step (2) into a three-neck flask, deoxidizing for 20min by using nitrogen, heating to 80 ℃, dissolving 0.2g of ammonium persulfate in 2m L of distilled water, dropwise adding the solution into the emulsion, reacting for 6 hours at 80 ℃, and naturally cooling to room temperature to obtain the high-temperature-resistant polymer microsphere nano plugging agent.
The high temperature resistant polymer microsphere nano plugging agent prepared in the embodiment is added into water to prepare a nano plugging agent solution with the mass fraction of 0.5%, the nano plugging agent solution is dripped on conductive adhesive, infrared lamp irradiation drying is carried out, the microscopic morphology of the product of the embodiment 1 is observed by using a scanning electron microscope, the result is shown in figure 1, as can be seen from figure 1, the average particle size of the obtained polymer microsphere is 90-200nm, and the obtained product is in a nano level.
Example 2
A preparation method of a high-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid comprises the following steps:
(1) adding 10g of acrylamide, 3g of 2-acrylamide-2-methylpropanesulfonic acid, 1g of dimethyl diallyl ammonium chloride, 2g of bismaleimide and 3g of reactive emulsifier MS-1 into 100g of water, and uniformly mixing; and adjusting the pH of the system to 7.0 by using a sodium hydroxide solution with the mass concentration of 20 wt% to obtain a solution.
(2) Uniformly mixing 20g of styrene, 5g of dodecyl acrylate and 1g of hexamethylcyclotrisiloxane, and adding the mixture into the solution obtained in the step (1); emulsifying by using a shearing emulsifying machine, wherein the rotating speed of the shearing emulsifying machine is 2000r/min, and obtaining the emulsion.
(3) And (3) transferring the emulsion obtained in the step (2) into a three-neck flask, deoxidizing for 20min by using nitrogen, heating to 80 ℃, dissolving 0.2g of ammonium persulfate in 2m L of distilled water, dropwise adding the solution into the emulsion, reacting for 6 hours at 80 ℃, and naturally cooling to room temperature to obtain the high-temperature-resistant polymer microsphere nano plugging agent.
Example 3
A preparation method of a high-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid comprises the following steps:
(1) adding 10g of acrylamide, 3g of 2-acrylamide-2-methylpropanesulfonic acid, 1g of acryloyloxyethyl trimethyl ammonium chloride, 2g of divinylbenzene and 3g of reactive emulsifier MS-1 into 100g of water, and uniformly mixing; and adjusting the pH of the system to 7.0 by using a sodium hydroxide solution with the mass concentration of 20 wt% to obtain a solution.
(2) Uniformly mixing 18g of styrene, 6g of dodecyl acrylate and 2g of hexamethylcyclotrisiloxane, and adding the mixture into the solution obtained in the step (1); emulsifying by using a shearing emulsifying machine, wherein the rotating speed of the shearing emulsifying machine is 2000r/min, and obtaining the emulsion.
(3) Transferring the emulsion obtained in the step (2) into a three-neck flask, deoxidizing for 20min by using nitrogen, and heating to 80 ℃; and (3) dropwise adding 0.2g of dibenzoyl peroxide (BPO) into the emulsion, reacting for 6 hours at the temperature of 80 ℃, and naturally cooling to room temperature to obtain the high-temperature-resistant polymer microsphere nano plugging agent.
Comparative example 1
The preparation method of the polymer microsphere nano plugging agent for the water-based drilling fluid is the same as that in example 1, except that a branched monomer bismaleimide and an organosilicon monomer hexamethylcyclotrisiloxane are not added.
Comparative example 2
A polymer microsphere nano plugging agent for water-based drilling fluid is prepared by the same method as in example 1, except that a branched monomer bismaleimide is not added.
Comparative example 3
The preparation method of the polymer microsphere nano plugging agent for the water-based drilling fluid is the same as that in example 1, except that the monomer 2-acrylamide-2-methylpropanesulfonic acid is not added.
Comparative example 4
A polymer microsphere nano plugging agent for water-based drilling fluid is prepared in the same manner as in example 1, except that a cationic monomer methacryloyloxyethyl trimethyl ammonium chloride is not added.
Test example 1
The nano plugging agents prepared in examples 1 to 3 and comparative examples 1 to 4 were subjected to a particle size test in the following specific method:
adding the prepared Nano plugging agent into water to prepare a Nano plugging agent solution with the mass fraction of 1%, measuring the particle size of the Nano plugging agent by using a laser particle size analyzer Zetasizer Nano ZS, wherein the measuring temperature is room temperature, then aging the Nano plugging agent solution with the mass fraction of 1% for 16h at 220 ℃, and measuring the particle size again, wherein the results are shown in Table 1.
TABLE 1Z-average particle size before and after sample aging
As can be seen from Table 1, the particle size of the nano plugging agent synthesized by the embodiment of the invention is within the nano level, so that the nano pores and cracks in the stratum can be plugged, the pressure transmission of the drilling fluid in the stratum is reduced, and the stability of the well wall is facilitated. After aging for 16h at 220 ℃, the particle size of the nano blocking agent is reduced to a certain extent, but the particle size is reduced by less than half, which indicates that the synthesized nano blocking agent can resist higher temperature. The nano plugging agent prepared in the comparative example 1 has poor temperature resistance, and almost becomes a clear solution after aging because no branched monomer and organic silicon monomer are added, so that the particle size reduction rate is high; the grain size of the nano plugging agent obtained by adding no branched monomer in the comparative example 2 and only adding one vinyl monomer with a strong adsorption group in the comparative example 3 is also greatly reduced, but the reduction is smaller than that in the comparative example 1; comparative example 4 the nano plugging agent obtained without adding the cationic monomer has smaller particle size reduction rate after high-temperature aging, which shows that the cationic monomer has smaller influence on the temperature resistance.
Test example 2
The nano-scale plugging agents, silica sols, and nano-scale polyesters prepared in examples 1-3 and comparative examples 1-4 were subjected to rheological parameter, API fluid loss, and High Temperature High Pressure (HTHP) fluid loss measurements.
The silica sol has a pH of 9.5 and a SiO component2，SiO2The solid content of (b) is 30%, and the product is commercially available;
the nano polyester is a commercially available product, the particle size of the nano polyester is 556nm, the solid content of the polymer is 40%, and the nano polyester contains ester groups and sulfonic acid groups.
The specific test method is as follows:
the preparation of the bentonite-based slurry comprises the steps of pouring 400m L tap water into a high-speed stirring cup, adding 16.0g of bentonite for drilling fluid test slurry preparation (meeting SY/T5490-one 2016) and 0.8g of sodium carbonate (chemical purity) under the condition of high-speed stirring, stirring at a high speed for 20min, and sealing and maintaining for 24h at the temperature of 25 ℃.
Adding a sample to be tested into bentonite base slurry to obtain a drilling fluid, wherein the mass concentration of the sample to be tested in the drilling fluid is 10 g/L, testing rheological parameter apparent viscosity (AV, mPa & s), plastic viscosity (PV, mPa & s), dynamic shear force (YP, Pa) and API (API) filtration loss (m L) of the bentonite base slurry and the drilling fluid according to the national standard GB/T29170 and 2012 petroleum and gas industry drilling fluid laboratory test, aging the bentonite base slurry and the drilling fluid for 16h at 150 ℃ and 180 ℃ respectively by using a roller heating furnace, and determining rheological parameters, API filtration loss and high-temperature and high-pressure filtration loss, wherein the results are shown in tables 2 and 3.
Rheological Properties of the samples of Table 2
As can be seen from table 2, compared with the base slurry, the drilling fluid added with the nano plugging agent prepared in the embodiment of the present invention has substantially no change in rheological parameters of the drilling fluid before and after aging, which indicates that the nano plugging agent prepared in the present invention has excellent temperature resistance and hardly has any influence on the rheological properties of the drilling fluid. And after the drilling fluid added with the nano polyester product is aged at 180 ℃, the rheological parameters are increased rapidly, which shows that the nano polyester is decomposed after being aged. The drilling fluid added with the nano plugging agent prepared in the comparative example 1 has obviously increased rheological parameters after aging at 150 ℃ and 180 ℃, which indicates that the nano plugging agent prepared in the comparative example 1 is difficult to resist the high temperature of 150 ℃. The drilling fluid added with the nano plugging agents prepared in the comparative examples 2 and 3 has little change of rheological property at 150 ℃, but the rheological parameters are obviously increased after aging at 180 ℃, which shows that the nano plugging agents prepared in the comparative examples 2 and 3 can resist the high temperature of 150 ℃, but cannot resist the high temperature of 180 ℃; the drilling fluid added with the nano plugging agent prepared in the comparative example 4 has basically no change in rheological parameters of the drilling fluid before and after aging, which shows that the nano plugging agent prepared in the comparative example 4 without adding the cationic monomer has little influence on the rheological property of the drilling fluid.
Table 3 fluid loss data
As can be seen from table 3, the nano plugging agent prepared in the embodiment of the present invention can significantly reduce the API fluid loss of the drilling fluid, and compared with bentonite-based slurry, the drilling fluid added with the nano plugging agent prepared in the embodiment of the present invention has significantly reduced API fluid loss. After high-temperature aging, the high-temperature high-pressure filtration loss of the drilling fluid added with the nano plugging agent prepared in the embodiment is reduced to a certain extent relative to that of base slurry. Compared with the industrial products of the nano plugging agent, namely silica sol and nano polyester, the nano plugging agent prepared by the embodiment of the invention has excellent performance; the nano plugging agents prepared in comparative examples 1 to 3 have a large filtration loss after high-temperature aging due to poor temperature resistance. Comparative example 4 the nano plugging agent prepared without adding cationic monomer, although the particle size reduction rate after high temperature aging is small and has almost no influence on the rheological property of the drilling fluid, the filtration loss after high temperature aging is large because the nano plugging agent of comparative example 4 is difficult to stay in the filter cake due to the fact that no cationic monomer exists and the acting force between the nano plugging agent and the filter cake is small.
Therefore, the nano plugging agent can resist higher temperature, hardly influences rheological parameters of drilling fluid, and has a better fluid loss reduction effect.
Claims (10)
1. The high-temperature-resistant polymer microsphere nano plugging agent for the water-based drilling fluid is characterized by comprising the following raw materials in parts by weight: 7-20 parts of vinyl monomer with strong adsorption group, 0.5-2 parts of cationic monomer, 1-4 parts of branched monomer, 2-5 parts of emulsifier, 15-30 parts of styrene, 5-10 parts of acrylate hydrophobic monomer, 1-3 parts of organosilicon monomer, 0.1-0.5 part of initiator and 150 parts of water 100 and the like.
2. The high temperature resistant polymer microsphere nano plugging agent for the water-based drilling fluid as claimed in claim 1, wherein the high temperature resistant polymer microsphere nano plugging agent comprises the following raw materials in parts by weight: 10-15 parts of vinyl monomer with strong adsorption groups, 1-2 parts of cationic monomer, 2-3 parts of branched monomer, 2-3 parts of emulsifier, 15-25 parts of styrene, 5-8 parts of acrylate hydrophobic monomer, 1-2 parts of organosilicon monomer, 0.1-0.3 part of initiator and 120 parts of water.
3. The high-temperature-resistant polymer microsphere nano plugging agent for the water-based drilling fluid as claimed in claim 1, wherein the vinyl monomer with the strong adsorption group is two or three of acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and N-dodecylacrylamide.
4. The high-temperature-resistant polymer microsphere nano plugging agent for the water-based drilling fluid as claimed in claim 3, wherein the vinyl monomer with the strong adsorption group is a combination of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid, and the mass ratio of the acrylamide to the 2-acrylamido-2-methylpropanesulfonic acid is 1: 0.2-0.5.
5. The high temperature resistant polymer microsphere nano plugging agent for the water-based drilling fluid according to claim 1, wherein the cationic monomer is one or a combination of two of dimethyldiallylammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride and acryloyloxyethyl trimethyl ammonium chloride.
6. The high temperature resistant polymer microsphere nano plugging agent for the water-based drilling fluid of claim 1, wherein the branched monomer is one of bismaleimide, divinylbenzene and ethylene glycol dimethacrylate.
7. The high-temperature resistant polymer microsphere nano plugging agent for the water-based drilling fluid as claimed in claim 1, wherein the emulsifier is a reactive emulsifier MS-1; the acrylate hydrophobic monomer is one or the combination of more than two of butyl acrylate, ethyl acrylate and dodecyl acrylate.
8. The high-temperature resistant polymer microsphere nano plugging agent for the water-based drilling fluid as claimed in claim 1, wherein the organosilicon monomer is one or a combination of two of octamethylcyclotetrasiloxane, hexamethylcyclotrisiloxane, hexamethyldisiloxane and hydroxyl silicone oil; the initiator is one of ammonium persulfate, potassium persulfate, hydrogen peroxide, dibenzoyl peroxide and azobisisobutyronitrile.
9. The preparation method of the high temperature resistant polymer microsphere nano plugging agent for the water-based drilling fluid, which is disclosed by any one of claims 1 to 8, comprises the following steps:
(1) adding a vinyl monomer with a strong adsorption group, a cationic monomer, a branched monomer and an emulsifier into water, uniformly mixing, and adjusting the pH of a system to 6.0-8.0 to obtain a solution;
(2) uniformly mixing styrene, an acrylate hydrophobic monomer and an organic silicon monomer, adding the mixture into the solution obtained in the step (1), and emulsifying to obtain an emulsion;
(3) deoxidizing the emulsion obtained in the step (2) with nitrogen for 20min, heating to 65-90 ℃, adding an initiator, and reacting; and after the reaction is finished, naturally cooling to room temperature to obtain the high-temperature-resistant polymer microsphere nano plugging agent.
10. The preparation method of the high temperature resistant polymer microsphere nano plugging agent for the water-based drilling fluid according to claim 9, characterized by comprising one or more of the following conditions:
a. in the step (1), sodium hydroxide solution with the mass concentration of 20 wt% is used for adjusting the pH of the system;
b. the emulsification in the step (2) is emulsification by using a shearing emulsifying machine, wherein the rotating speed of the shearing emulsifying machine is 1500-3000r/min, preferably 2000 r/min;
c. when the initiator in the step (3) is ammonium persulfate or potassium persulfate, the initiator is added dropwise in the form of initiator aqueous solution, the mass concentration of the initiator aqueous solution is 0.1g/m L, and when the initiator is hydrogen peroxide, dibenzoyl peroxide or azobisisobutyronitrile, the initiator is directly added into a reaction system;
d. the reaction time in the step (3) is 4 to 8 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010354860.0A CN111499790B (en) | 2020-04-29 | 2020-04-29 | High-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010354860.0A CN111499790B (en) | 2020-04-29 | 2020-04-29 | High-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111499790A true CN111499790A (en) | 2020-08-07 |
| CN111499790B CN111499790B (en) | 2021-05-28 |
Family
ID=71871536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010354860.0A Active CN111499790B (en) | 2020-04-29 | 2020-04-29 | High-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111499790B (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112812245A (en) * | 2021-01-25 | 2021-05-18 | 中国石油大学(华东) | High-temperature-resistant pressure-bearing plugging agent for water-based drilling fluid and preparation method and application thereof |
| CN113403047A (en) * | 2021-06-22 | 2021-09-17 | 西南石油大学 | Synthesis of nano emulsion plugging agent and water-based drilling fluid |
| CN113416272A (en) * | 2021-06-22 | 2021-09-21 | 西南石油大学 | Synthesis of nano emulsion plugging agent and oil-based drilling fluid |
| CN113667461A (en) * | 2021-08-21 | 2021-11-19 | 中国石油大学(华东) | High-temperature-resistant super-hydrophobic shale inhibitor and preparation method and application thereof |
| CN114381242A (en) * | 2022-01-24 | 2022-04-22 | 西南石油大学 | Modified manganese dioxide nano hydrogel plugging agent and water-based drilling fluid |
| CN114426652A (en) * | 2020-10-29 | 2022-05-03 | 中国石油化工股份有限公司 | High-temperature-resistant nano-micron plugging agent for drilling fluid and preparation method thereof |
| CN114456325A (en) * | 2021-12-22 | 2022-05-10 | 中国石油天然气集团有限公司 | Hydrophobic membrane structure wall-fixing agent and preparation method and application thereof |
| CN114685736A (en) * | 2021-12-14 | 2022-07-01 | 中国石油天然气集团有限公司 | High-temperature-resistant high-salt-resistant hydrophobic blocking agent and preparation method thereof |
| CN114686183A (en) * | 2020-12-25 | 2022-07-01 | 中石化石油工程技术服务有限公司 | Lubricating plugging fluid loss additive for drilling fluid and preparation method thereof |
| CN114686190A (en) * | 2021-12-14 | 2022-07-01 | 中国石油天然气集团有限公司 | High-temperature-resistant and saturated-salt-resistant plugging fluid loss agent and preparation method thereof |
| CN114808448A (en) * | 2021-01-21 | 2022-07-29 | 中国石油天然气股份有限公司 | Modified fiber material, preparation method thereof and plugging agent for oil-based drilling fluid |
| CN114874375A (en) * | 2022-05-23 | 2022-08-09 | 中国石油大学(华东) | 230 ℃ high-temperature-resistant salt-resistant self-adaptive plugging agent and preparation method thereof |
| CN115160513A (en) * | 2022-07-05 | 2022-10-11 | 中国石油大学(华东) | Rigid-flexible phase-offset blocking agent capable of resisting high temperature of 240 ℃ and resisting high salt and preparation method thereof |
| CN115247052A (en) * | 2021-04-27 | 2022-10-28 | 中国石油天然气集团有限公司 | Oil-based drilling fluid plugging agent and preparation method thereof |
| CN115536777A (en) * | 2022-11-08 | 2022-12-30 | 中国石油大学(华东) | Micromolecular hydrophobic association high-temperature-resistant shale inhibitor and preparation method and application thereof |
| CN115850570A (en) * | 2022-10-26 | 2023-03-28 | 长江大学 | Hyperbranched polymer microsphere fluid loss additive as well as preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012069942A1 (en) * | 2010-11-24 | 2012-05-31 | Basf Se | Use of hydrophobically associating copolymer as additive in specific oilfield applications |
| CN107337762A (en) * | 2017-08-15 | 2017-11-10 | 山东诺尔生物科技有限公司 | A kind of hydrophobic association cross-linked polymer microsphere, preparation method and application |
| CN107915798A (en) * | 2017-12-05 | 2018-04-17 | 西南石油大学 | A kind of water-base drilling fluid polymer nanocomposite sealing agent and preparation method thereof |
| CN110066363A (en) * | 2019-05-10 | 2019-07-30 | 四川洁能锐思石油技术有限公司 | A kind of salt resistance oil-containing fracturing fluid system and its preparation method and application |
-
2020
- 2020-04-29 CN CN202010354860.0A patent/CN111499790B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012069942A1 (en) * | 2010-11-24 | 2012-05-31 | Basf Se | Use of hydrophobically associating copolymer as additive in specific oilfield applications |
| CN107337762A (en) * | 2017-08-15 | 2017-11-10 | 山东诺尔生物科技有限公司 | A kind of hydrophobic association cross-linked polymer microsphere, preparation method and application |
| CN107915798A (en) * | 2017-12-05 | 2018-04-17 | 西南石油大学 | A kind of water-base drilling fluid polymer nanocomposite sealing agent and preparation method thereof |
| CN110066363A (en) * | 2019-05-10 | 2019-07-30 | 四川洁能锐思石油技术有限公司 | A kind of salt resistance oil-containing fracturing fluid system and its preparation method and application |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114426652B (en) * | 2020-10-29 | 2024-05-17 | 中国石油化工股份有限公司 | High-temperature-resistant nano-micron plugging agent for drilling fluid and preparation method thereof |
| CN114426652A (en) * | 2020-10-29 | 2022-05-03 | 中国石油化工股份有限公司 | High-temperature-resistant nano-micron plugging agent for drilling fluid and preparation method thereof |
| CN114686183A (en) * | 2020-12-25 | 2022-07-01 | 中石化石油工程技术服务有限公司 | Lubricating plugging fluid loss additive for drilling fluid and preparation method thereof |
| CN114686183B (en) * | 2020-12-25 | 2023-09-12 | 中石化石油工程技术服务有限公司 | Lubricating plugging filtrate reducer for drilling fluid and preparation method thereof |
| CN114808448B (en) * | 2021-01-21 | 2024-05-28 | 中国石油天然气股份有限公司 | Modified fiber material, preparation method thereof and plugging agent for oil-based drilling fluid |
| CN114808448A (en) * | 2021-01-21 | 2022-07-29 | 中国石油天然气股份有限公司 | Modified fiber material, preparation method thereof and plugging agent for oil-based drilling fluid |
| CN112812245B (en) * | 2021-01-25 | 2022-05-10 | 中国石油大学(华东) | High-temperature-resistant pressure-bearing plugging agent for water-based drilling fluid and preparation method and application thereof |
| CN112812245A (en) * | 2021-01-25 | 2021-05-18 | 中国石油大学(华东) | High-temperature-resistant pressure-bearing plugging agent for water-based drilling fluid and preparation method and application thereof |
| CN115247052A (en) * | 2021-04-27 | 2022-10-28 | 中国石油天然气集团有限公司 | Oil-based drilling fluid plugging agent and preparation method thereof |
| CN113416272B (en) * | 2021-06-22 | 2022-06-07 | 西南石油大学 | Synthesis of nano emulsion plugging agent and oil-based drilling fluid |
| CN113403047A (en) * | 2021-06-22 | 2021-09-17 | 西南石油大学 | Synthesis of nano emulsion plugging agent and water-based drilling fluid |
| CN113416272A (en) * | 2021-06-22 | 2021-09-21 | 西南石油大学 | Synthesis of nano emulsion plugging agent and oil-based drilling fluid |
| CN113667461A (en) * | 2021-08-21 | 2021-11-19 | 中国石油大学(华东) | High-temperature-resistant super-hydrophobic shale inhibitor and preparation method and application thereof |
| CN114686190A (en) * | 2021-12-14 | 2022-07-01 | 中国石油天然气集团有限公司 | High-temperature-resistant and saturated-salt-resistant plugging fluid loss agent and preparation method thereof |
| CN114685736A (en) * | 2021-12-14 | 2022-07-01 | 中国石油天然气集团有限公司 | High-temperature-resistant high-salt-resistant hydrophobic blocking agent and preparation method thereof |
| CN114456325B (en) * | 2021-12-22 | 2024-05-03 | 中国石油天然气集团有限公司 | Wall fixing agent with hydrophobic membrane structure and preparation method and application thereof |
| CN114456325A (en) * | 2021-12-22 | 2022-05-10 | 中国石油天然气集团有限公司 | Hydrophobic membrane structure wall-fixing agent and preparation method and application thereof |
| CN114381242A (en) * | 2022-01-24 | 2022-04-22 | 西南石油大学 | Modified manganese dioxide nano hydrogel plugging agent and water-based drilling fluid |
| CN114874375A (en) * | 2022-05-23 | 2022-08-09 | 中国石油大学(华东) | 230 ℃ high-temperature-resistant salt-resistant self-adaptive plugging agent and preparation method thereof |
| CN115160513A (en) * | 2022-07-05 | 2022-10-11 | 中国石油大学(华东) | Rigid-flexible phase-offset blocking agent capable of resisting high temperature of 240 ℃ and resisting high salt and preparation method thereof |
| CN115160513B (en) * | 2022-07-05 | 2023-08-01 | 中国石油大学(华东) | 240 ℃ high-temperature resistant high-salt resistant rigid-flexible blocking agent and preparation method thereof |
| US11970655B2 (en) * | 2022-07-05 | 2024-04-30 | China University Of Petroleum (East China) | High temperature and high salinity-resistant complementarily rigid-flexible plugging agent and method for preparing the same and water-based drilling fluid and use thereof |
| CN115850570A (en) * | 2022-10-26 | 2023-03-28 | 长江大学 | Hyperbranched polymer microsphere fluid loss additive as well as preparation method and application thereof |
| CN115850570B (en) * | 2022-10-26 | 2023-11-28 | 长江大学 | Hyperbranched polymer microsphere filtrate reducer and preparation method and application thereof |
| CN115536777A (en) * | 2022-11-08 | 2022-12-30 | 中国石油大学(华东) | Micromolecular hydrophobic association high-temperature-resistant shale inhibitor and preparation method and application thereof |
| CN115536777B (en) * | 2022-11-08 | 2023-08-04 | 中国石油大学(华东) | Small-molecular hydrophobic association high-temperature-resistant shale inhibitor and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111499790B (en) | 2021-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111499790B (en) | High-temperature-resistant polymer microsphere nano plugging agent for water-based drilling fluid and preparation method thereof | |
| US11072738B2 (en) | Environment-friendly high-temperature resistant water-based drilling fluid plugging anti-sloughing agent, preparation method thereof and the water-based drilling fluid | |
| CN113416528B (en) | Organic/inorganic nano composite gel plugging agent and oil-based drilling fluid | |
| CN111303355B (en) | High-temperature-resistant silicon dioxide Janus colloidal particle plugging agent and preparation method and application thereof | |
| O'Haver et al. | In situ formation of polystyrene in adsorbed surfactant bilayers on precipitated silica | |
| Lei et al. | Synthesis and characterization of high-temperature self-crosslinking polymer latexes and their application in water-based drilling fluid | |
| CN113773440B (en) | Water-based drilling fluid filtrate reducer capable of inhibiting natural gas hydrate decomposition and preparation method and application thereof | |
| CN114805709B (en) | Ultrahigh-temperature-resistant nano plugging agent with emulsion stability for oil-based drilling fluid and preparation method and application thereof | |
| CN113493554A (en) | Nano anti-collapse inhibitor for drilling fluid and preparation method thereof | |
| CN115232261A (en) | Hybrid gelling agent for oilfield acidification based on POSS-based crosslinking agent and preparation method thereof | |
| CN114214046B (en) | High-temperature-resistant modified manganese dioxide nano plugging agent and oil-based drilling fluid | |
| CN108641686B (en) | Flow pattern regulator for ultra-high temperature and ultra-high density water-based drilling fluid and completion fluid and preparation method thereof | |
| CN108300433B (en) | Nano composite plugging agent for drilling shale horizontal well and preparation method thereof | |
| CN115260404B (en) | High-temperature-resistant hydrophobic nano plugging agent for water-based drilling fluid and preparation method and application thereof | |
| CN115677925B (en) | Constant-rheological stabilizer, drilling fluid and preparation method thereof | |
| CN115677923B (en) | Pre-crosslinked gel particle plugging agent and preparation method and application thereof | |
| CN111087553B (en) | Multilayer core-shell structure polymer microsphere, profile control agent, preparation method and application thereof | |
| CN115093837A (en) | Wall-fixing agent and preparation method and application thereof | |
| CN114685736A (en) | High-temperature-resistant high-salt-resistant hydrophobic blocking agent and preparation method thereof | |
| Meng et al. | Core-shell structured polystyrene microspheres for improving plugging performance of oil-based drilling fluids | |
| CN114181676B (en) | Flow pattern regulator, preparation method thereof and deepwater water-based constant-current variable drilling fluid | |
| CN115960304B (en) | High-resistance Wen Jianji bionic wall fixing agent for water-based drilling fluid and preparation method and application thereof | |
| CN111423860B (en) | High-strength nano plugging agent | |
| CN113429580B (en) | Modified hyperbranched polyester grafted carbon microsphere and preparation method and application thereof | |
| CN116063994B (en) | Efficient plugging agent for drilling fluid and preparation method thereof |
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 |