CN114479779B - Plugging agent for drilling fluid and preparation method thereof - Google Patents
Plugging agent for drilling fluid and preparation method thereof Download PDFInfo
- Publication number
- CN114479779B CN114479779B CN202011160096.XA CN202011160096A CN114479779B CN 114479779 B CN114479779 B CN 114479779B CN 202011160096 A CN202011160096 A CN 202011160096A CN 114479779 B CN114479779 B CN 114479779B
- Authority
- CN
- China
- Prior art keywords
- asphalt
- plugging agent
- modified asphalt
- rubber powder
- plugging
- 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
- 238000005553 drilling Methods 0.000 title claims abstract description 60
- 239000012530 fluid Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000010426 asphalt Substances 0.000 claims abstract description 108
- 239000002245 particle Substances 0.000 claims abstract description 73
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 59
- 239000000843 powder Substances 0.000 claims abstract description 29
- 229920001971 elastomer Polymers 0.000 claims abstract description 16
- 239000005060 rubber Substances 0.000 claims abstract description 16
- 239000002657 fibrous material Substances 0.000 claims abstract description 9
- 239000007770 graphite material Substances 0.000 claims abstract description 7
- 239000011258 core-shell material Substances 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 239000010439 graphite Substances 0.000 claims description 12
- 229910002804 graphite Inorganic materials 0.000 claims description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 9
- 150000008064 anhydrides Chemical class 0.000 claims description 9
- 230000008014 freezing Effects 0.000 claims description 9
- 238000007710 freezing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000011593 sulfur Substances 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 8
- 150000007524 organic acids Chemical class 0.000 claims description 7
- 229920002472 Starch Polymers 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 239000008107 starch Substances 0.000 claims description 6
- 235000019698 starch Nutrition 0.000 claims description 6
- 229920000459 Nitrile rubber Polymers 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229920003043 Cellulose fiber Polymers 0.000 claims description 3
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 3
- 239000004627 regenerated cellulose Substances 0.000 claims description 3
- 229920006297 regenerated protein fiber Polymers 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 2
- 229920005549 butyl rubber Polymers 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 229920005652 polyisobutylene succinic anhydride Polymers 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 13
- 239000002002 slurry Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 238000007873 sieving Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000011257 shell material Substances 0.000 description 5
- 239000010902 straw Substances 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009545 invasion Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 244000144725 Amygdalus communis Species 0.000 description 1
- 235000011437 Amygdalus communis Nutrition 0.000 description 1
- 235000017060 Arachis glabrata Nutrition 0.000 description 1
- 244000105624 Arachis hypogaea Species 0.000 description 1
- 235000010777 Arachis hypogaea Nutrition 0.000 description 1
- 235000018262 Arachis monticola Nutrition 0.000 description 1
- -1 Ca 2+ Chemical class 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 240000007049 Juglans regia Species 0.000 description 1
- 235000009496 Juglans regia Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 235000020224 almond Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- WNJYIHGQTOOFER-UHFFFAOYSA-L disodium;styrene;sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O.C=CC1=CC=CC=C1 WNJYIHGQTOOFER-UHFFFAOYSA-L 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 235000020232 peanut Nutrition 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- MLGWTHRHHANFCC-UHFFFAOYSA-N prop-2-en-1-amine;hydrochloride Chemical compound Cl.NCC=C MLGWTHRHHANFCC-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000010558 suspension polymerization method Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 235000020234 walnut Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C08F289/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block 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
- C09K2208/08—Fiber-containing well treatment fluids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sealing Material Composition (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a plugging agent for drilling fluid and a preparation method thereof. The plugging agent for the drilling fluid comprises the following components: 58-90 parts of high-elastic modified asphalt particles; 5-21 parts of fiber materials; 5-21 parts of graphite material; the high-elastic modified asphalt particles have a core-shell structure, and take rubber powder as a core and modified asphalt as a shell. The plugging agent is suitable for oil-based drilling fluid, has good compatibility with the oil-based drilling fluid, high plugging speed and high temperature resistance, and has wider adaptability to different sizes of the pores or cracks of a leakage layer.
Description
Technical Field
The invention relates to the field of petroleum drilling plugging, in particular to a plugging agent for drilling fluid and a preparation method thereof.
Background
With the deep exploration and development of complex stratum, the demand of Chinese unconventional oil and gas resources on oil-based drilling fluids is increasing. The plugging agent with wide application and low cost at present is bridging plugging agent. The bridging leakage blocking is mainly characterized in that various leakage blocking materials are used for preparing leakage blocking slurry according to a certain proportion, so that cracks and pore channels are blocked, a leakage blocking layer is blocked through the functions of bridging, supporting, connecting, blocking, filling and the like, and the key technology is that whether the particle size distribution in the leakage blocking agent is matched with the diameter of the leakage channel or not. However, in the drilling process, the width of the crack and the size of the pore of the lost stratum can not be accurately mastered, and the formula of the plugging agent can not be optimized and determined, so that the uncertainty of successful construction is increased, and the plugging success rate is reduced.
At present, most of conventional leakage-proof plugging materials are hydrophilic and oleophobic, but the varieties of special oil-based drilling fluid plugging agents are less. Although the use of water swellable as a lost circulation material has shown technical advantages, there are some disadvantages to the use of such products in lost circulation operations for drilling: poor gel strength, large expansion coefficient after water absorption, high expansion rate, difficult control, poor thermal stability and the like. The basic requirement for the oil-based drilling fluid plugging agent is that the plugging agent has good compatibility with the oil-based drilling fluid, good plugging effect on high-permeability and microcrack stratum and high bearing capacity.
CN102504776a discloses a plugging agent for malignant leakage and a preparation method. The preparation method mainly comprises the steps of dissolving allyl ammonium chloride, acrylamide and sodium styrene sulfate in water, regulating the pH value, adding an initiator for reaction, and repeatedly washing with a solvent and precipitating to obtain the copolymer. The preparation process is complex, high in cost and easy to cause pollution, and is not suitable for being used in oil-based drilling fluid.
CN102618230B discloses a controllable cross-linked gel water-plugging material. The method comprises the steps of coating particle gel containing a cross-linking agent by adopting a reverse suspension polymerization method by taking an oil phase as a continuous phase and taking a water phase and solid particles as disperse phases, dispersing coated particles into an HPAM water solution, and performing slow cross-linking to obtain the water plugging agent. The method has the advantages of complex process, high cost, formation of strong gel in the preparation process, high strength, difficult application, poor adaptability and unsatisfactory use effect.
Therefore, the existing plugging materials for the oil-based drilling fluid are few, most plugging agents suitable for the water-based drilling fluid are used, the problems of high viscosity of the oil-based drilling fluid, poor plugging effect while drilling and the like can be caused when the plugging agents are used for the oil-based drilling fluid, and the plugging agents are not mature in development and application of the anti-leakage plugging technology of the oil-based drilling fluid as a matching technology of the oil-based drilling fluid.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the plugging agent for the drilling fluid and the preparation method thereof, and the plugging agent is suitable for oil-based drilling fluid, has good compatibility with the oil-based drilling fluid, high plugging speed and high temperature resistance, and has wider adaptability to different sizes of pores or cracks of a leakage layer.
The invention provides a plugging agent for drilling fluid, which comprises the following components:
58-90 parts of high-elastic modified asphalt particles;
5-21 parts of fiber materials;
5-21 parts of graphite material;
the high-elastic modified asphalt particles have a core-shell structure, take rubber powder as a core and take modified asphalt as a shell; the modified asphalt is obtained by reacting grafted activated asphalt with volcanic ash; the weight of the modified asphalt is 85-95% of the grafted activated asphalt and 5-15% of the volcanic ash.
The particle size of the high-elastic modified asphalt particles can be more than two different particle size distribution combinations of 40-80 meshes, 80-120 meshes, 120-160 meshes and 160 meshes, (40-80 meshes are counted in the upper part of a 80-mesh standard sieve under a 40-target standard sieve, and the like, and 160 meshes are counted in the lower part of a 160-target standard sieve). When different particle size distribution combinations are adopted, the content of each particle size distribution is less than or equal to 90 percent, preferably less than or equal to 70 percent, and more preferably less than or equal to 50 percent based on the mass of the high-elasticity modified asphalt particles.
Based on the weight of the high-elasticity modified asphalt particles, the modified asphalt accounts for 70-90 percent, and the rubber powder accounts for 10-30 percent.
The rubber powder is one or more of butyl rubber powder, nitrile rubber powder, chloroprene rubber powder, styrene-butadiene rubber powder or fluorine-containing rubber powder. The particle size of the rubber powder is 60-200 meshes.
The grafted activated asphalt is prepared by reacting base asphalt with organic acid anhydride, wherein the organic acid anhydride is at least one of maleic anhydride, polyethylene glycol anhydride, polyglutaric anhydride, polyazelaic anhydride and polyisobutylene succinic anhydride; the matrix asphalt is one or more of vacuum residuum, oxidized asphalt, blended asphalt, solvent deasphalted and natural asphalt, and the softening point of the matrix asphalt is 60-90 ℃. Wherein the addition amount of the organic acid accounts for 2-20% of the weight of the basic asphalt.
The volcanic ash is superfine volcanic ash with the grain diameter of 200-800 nm, the sulfur content is more than or equal to 5wt%, and the preferable sulfur content is 6-15%.
The high-elastic modified asphalt particles are prepared by the following method: firstly preparing modified asphalt, then adding rubber powder, fully shearing, and then freezing and crushing to obtain high-elasticity modified asphalt particles.
Wherein the shearing time is 10-60 minutes, and the temperature is 150-190 ℃. The freezing time is 1-10 hours, and the freezing temperature is minus 30 ℃ to minus 50 ℃.
Wherein, the method for preparing the modified asphalt comprises the following steps: heating matrix asphalt to a molten state, adding organic acid anhydride, introducing inert gas to maintain the pressure of an asphalt reaction kettle at 0.2-1.0 MPa, reacting at 150-250 ℃ for 2-8 hours to obtain grafted activated asphalt; adding volcanic ash into the grafted activated asphalt, and mixing and reacting for 30-180 minutes at the temperature of 150-180 ℃ to obtain the modified asphalt.
The fiber material is regenerated fiber, including one or more of regenerated cellulose fiber, regenerated protein fiber and regenerated starch fiber; the length of the fiber material is 0.5-3.0 mm.
The graphite material is at least one of flake graphite, elastic graphite or expanded graphite.
The second aspect of the invention provides a preparation method of the plugging agent for drilling fluid, which comprises the following steps: and uniformly mixing the fiber material, the high-elastic modified asphalt particles and the graphite material according to a proportion to obtain the plugging agent for the drilling fluid.
The invention provides an application of the plugging agent for drilling fluid in oil-based drilling fluid.
The application is specifically as follows: the plugging agent for the drilling fluid is used for plugging while drilling: the plugging agent is added into the oil-based drilling fluid, and the addition amount of the plugging agent is 1-10 parts by weight, and more preferably 2-5 parts by weight, based on 100 parts by weight of the oil-based drilling fluid. When the plugging agent is used as plugging while drilling, the penetration depth of filtrate is less than 3cm in a sand bed with 20-40 meshes; for plugging the crack with the thickness of 0.5mm, the bearing capacity is more than or equal to 8MPa.
The application also comprises that the plugging agent and the bridging material are added into the oil-based drilling fluid together to form a plugging slurry for plugging operation. The bridging material refers to a granular material with larger grain size, which is suitable for the width of the leakage channel, and is usually more than 0.5mm, and the granular material can be contacted with each other in the leakage channel to form a 'bridge-shaped structure'. The bridging material can be straw materials and/or shell materials, wherein the straw materials are wheat straw, rice straw, soybean straw and the like, the shell materials are walnut shells, almond shells, peanut shells and the like, and the length of the bridging material is 3-6 mm; the addition amount of the plugging agent is 1-10 parts by weight, and more preferably 2-5 parts by weight based on 100 parts by weight of the oil-based drilling fluid; the addition amount of the bridging material is 1-5 parts by weight.
Compared with the prior art, the invention has the following advantages:
(1) The plugging agent comprises high-elastic modified asphalt particles, wherein the high-elastic modified asphalt particles are of a core-shell structure with rubber powder as a core and modified asphalt as a shell, so that the plugging agent has certain viscoelasticity and certain strength, can be better embedded into irregular pore channels and cracks, and improves the underground use effect.
(2) In the process of preparing modified asphalt, the basic asphalt is firstly grafted and activated, so that the surface of the asphalt is grafted with acid groups. Volcanic ash contains a large amount of alkaline ions, such as Ca 2+ 、Mg 2+ And Fe (Fe) 3+ And the like, the alkaline ions react with anhydride grafted on the asphalt, so that the asphalt modified by adding volcanic ash has better high-temperature stability and higher strength. The volcanic ash contains a large amount of sulfides, active sulfur is released at high temperature to promote the crosslinking reaction of asphalt and rubber powder, so that the firmness of the shell (asphalt) and the core (rubber powder) is improved, and the high-temperature stability of the modified asphalt is further improved.
(3) The plugging agent optimizes the grading and distribution of different particle sizes, can enter pores or cracks with different shapes and sizes to generate plugging under the action of pressure difference, has wider plugging range and has lower dependence of plugging effect on the size of the pores or cracks of a plugging layer.
(4) The plugging agent disclosed by the invention has better compatibility with oil-based drilling fluid. In addition, the plugging agent disclosed by the invention has good plugging property and well wall stability, can be well dispersed in oil-based drilling fluid, has small influence on the rheological property of the drilling fluid, can assist in generating compact mud cakes, and improves the plugging effect.
(5) The plugging agent disclosed by the invention is simple in preparation process, convenient to operate and low in cost, and the obtained plugging agent not only has controllable particle size and certain elastic deformation capacity, but also is excellent in high-temperature resistance and can be used in high-temperature drilling operation.
Detailed Description
The following non-limiting examples will enable those of ordinary skill in the art to more fully understand the invention and are not intended to limit the invention in any way. Wherein, in the present invention, wt% means mass fraction.
Example 1
200g of blended asphalt with a softening point of 62.5 ℃ is heated to a molten state, 18.2g of maleic anhydride is added, nitrogen is introduced to keep the pressure of an asphalt reaction kettle at 0.8MPa, and the asphalt is reacted for 6 hours at 180 ℃ to obtain the grafted activated asphalt. 21.5g of volcanic ash (sulfur content is 6.4 and wt%) with the average particle size of 250nm is added into the grafted activated asphalt, and the mixture is mixed and reacted for 50min at 160 ℃ to obtain the modified asphalt.
32.5g of 80-mesh nitrile rubber powder is added into the modified asphalt, and the asphalt is sheared for 35min at 180 ℃. Freezing at-30deg.C for 5 hr. And then crushing by a crusher. Sieving with 40-80 mesh, 120-160 mesh standard sieve to obtain 40-80 mesh, 80-120 mesh and 120-160 mesh modified asphalt particles with different particle diameters greater than 160 mesh.
90g (30 wt% of 40-80 mesh particles, 35wt% of 120-160 mesh particles and 35-wt% of > 160 mesh particles) of the high-elastic modified asphalt particles, 9.3g of regenerated starch fibers (with the length of 1.0 mm) and 14.6g of elastic graphite are taken and uniformly mixed to obtain the plugging agent.
Example 2
200g of oxidized asphalt with a softening point of 71.5 ℃ is heated to a molten state, 12.5g of polyglutaric anhydride is added, nitrogen is introduced to keep the pressure of an asphalt reaction kettle at 0.6MPa, and the asphalt is reacted for 5 hours at 190 ℃ to obtain the grafted activated asphalt. 16.2g of volcanic ash (sulfur content is 7.6 and wt%) with the average particle size of 400nm is added into the grafted activated asphalt, and the mixture is mixed and reacted for 60 minutes at 165 ℃ to obtain the modified asphalt.
42.5g of 100-mesh neoprene rubber powder is added into the modified asphalt, and the modified asphalt is sheared for 50min at 175 ℃. Freezing at-35 ℃ for 5 hours. And then crushing by a crusher. Sieving with 40-80 mesh, 120-160 mesh standard sieve to obtain 40-80 mesh, 80-120 mesh and 120-160 mesh modified asphalt particles with different particle diameters greater than 160 mesh.
68g (wherein, 35wt% of 40-80 mesh particles, 50wt% of 80-120 mesh particles and 15wt% of 160 mesh particles) of the high-elastic modified asphalt particles are taken, 7.6g of regenerated protein fibers (the length is 1.0 mm) and 16.6g of elastic graphite are uniformly mixed to obtain the plugging agent.
Example 3
200g of oxidized asphalt with a softening point of 78.4 ℃ is heated to a molten state, 31.2g of polyethylene glycol anhydride is added, nitrogen is introduced to keep the pressure of an asphalt reaction kettle at 0.6MPa and the temperature of 195 ℃ for 4.5 hours, and the grafted activated asphalt is obtained. 24.6g of volcanic ash (with the sulfur content of 11.5 and wt percent) with the average particle size of 650nm is added into the grafted activated asphalt, and the mixture is mixed and reacted for 70 minutes at 170 ℃ to obtain the modified asphalt.
51.5g of 120-mesh styrene-butadiene rubber powder is added into the modified asphalt, and the mixture is sheared for 60 minutes at 170 ℃. Freezing at-45deg.C for 5.5 hr. And then crushing by a crusher. Sieving with 40-80 mesh, 120-160 mesh standard sieve to obtain 40-80 mesh, 80-120 mesh and 120-160 mesh modified asphalt particles with different particle diameters greater than 160 mesh.
85g (wherein, 25wt% of particles with 80-120 meshes, 50wt% of particles with 120-160 meshes and 25wt% of particles with more than 160 meshes) of the high-elastic modified asphalt particles are taken, 11.8g of regenerated cellulose fibers (with the length of 1.5 mm) and 16.5g of crystalline flake graphite are uniformly mixed to obtain the plugging agent.
Example 4
200g of solvent with a softening point of 83.2 ℃ is deasphalted and heated to a molten state, 17.6g of maleic anhydride is added, nitrogen is introduced to keep the pressure of an asphalt reaction kettle at 1.0MPa, and the asphalt is reacted for 4 hours at 190 ℃ to obtain the grafted activated asphalt. 34.5g of volcanic ash (sulfur content is 9.3 and wt%) with the average particle size of 750nm is added into the grafted activated asphalt, and the mixture is mixed and reacted for 60 minutes at 180 ℃ to obtain the modified asphalt.
46.8g of 100 mesh nitrile rubber powder is added into the modified asphalt, and the mixture is sheared for 50min at 180 ℃. Freezing at-40deg.C for 5 hr. And then crushing by a crusher. Sieving with 40-80 mesh, 120-160 mesh standard sieve to obtain 40-80 mesh, 80-120 mesh and 120-160 mesh modified asphalt particles with different particle diameters greater than 160 mesh.
75g (25 wt% of particles with 40-80 meshes, 30wt% of particles with 80-120 meshes, 30wt% of particles with 120-160 meshes and 15% of particles with more than 160 meshes) of the high-elastic modified asphalt particles are taken, 14.6g of regenerated starch fiber (with the length of 1.0 mm) and 19.5g of elastic graphite are evenly mixed to obtain the plugging agent.
Comparative example 1
200g of the solvent having a softening point of 83.2℃were deasphalted and frozen at-40℃for 5 hours. And then crushing by a crusher. Sieving with 40-80 mesh, 120-160 mesh standard sieve to obtain 40-80 mesh, 80-120 mesh and 120-160 mesh asphalt particles with different particle diameters greater than 160 mesh.
75g of asphalt particles (wherein, 25wt% of 40-80 mesh particles, 30wt% of 80-120 mesh particles, 30wt% of 120-160 mesh particles and 15wt% of particles with more than 160 meshes) are taken, 14.6g of regenerated starch fibers (the length is 1.0 mm) and 19.5g of elastic graphite are evenly mixed to obtain the plugging agent.
Comparative example 2
200g of solvent with a softening point of 83.2 ℃ is deasphalted and heated to a molten state, 46.8g of 100-mesh nitrile rubber powder is added, and shearing is carried out for 50min at 180 ℃. Freezing at-40deg.C for 5 hr. And then crushing by a crusher. Sieving with 40-80 mesh, 120-160 mesh standard sieve to obtain 40-80 mesh, 80-120 mesh and 120-160 mesh modified asphalt particles with different particle diameters greater than 160 mesh.
75g (25 wt% of particles with 40-80 meshes, 30wt% of particles with 80-120 meshes, 30wt% of particles with 120-160 meshes and 15wt% of particles with more than 160 meshes) of the high-elastic modified asphalt particles are taken, 14.6g of regenerated starch fiber (with the length of 1.0 mm) and 19.5g of elastic graphite are evenly mixed to obtain the plugging agent.
And evaluating the performance of the plugging agent in the drilling fluid. An oil-based drilling fluid is first formulated. And (3) preparing a base solution by taking a proper amount of white oil and calcium chloride aqueous solution (the concentration is 20wt%) according to an oil-water volume ratio (80:20), adding 3.0 parts of an emulsifying agent, stirring at a high speed, adding 2.5 parts of organic soil and 3.0 parts of a filtrate reducer, and fully shearing and emulsifying uniformly to obtain the base slurry.
The plugging performance is evaluated by a sand bed evaluation test (for measuring the invasion depth), and the bearing capacity is evaluated by a plugging simulation device (for measuring the bearing capacity of a crack of 0.5 mm). The above prepared base slurries were added with the plugging agents obtained in examples 1 to 4 and comparative example, respectively, in amounts of 4%. The mesh number of sand in the sand bed test is 20-40 meshes, the test pressure is 0.7MPa, and the test time is 30min. The plugging simulation device adopts a plugging module as a crack template with the thickness of 0.5mm, and adopts nitrogen to slowly pressurize. The specific test results are shown in Table 1.
Table 1 results of evaluation of plugging properties of the plugging agents of examples 1 to 4 and comparative examples
| Depth of invasion/cm | Penetration depth reduction Rate (%) | Pressure bearing capacity/MPa | |
| Base slurry | 14.8 | - | - |
| Base stock +4% example 1 | 2.5 | 83.11 | 8.0 |
| Base stock +4% example 2 | 2.2 | 85.13 | 8.0 |
| Base stock +4% example 3 | 1.9 | 87.16 | 8.0 |
| Base stock +4% example 4 | 1.4 | 90.54 | 8.0 |
| Base slurry +4% comparative example 1 | 8.6 | 41.89 | 4.0 |
| Base slurry +4% comparative example 2 | 5.8 | 60.81 | 5.0 |
As can be seen from the data in table 2, after the plugging agent while drilling is added into the oil-based drilling fluid, the filtration loss of the sand bed is obviously reduced, and the invasion depth of the filtrate is less than 3cm; for a crack with the thickness of 0.5mm, the bearing capacity can reach more than 8.0MPa, and a good plugging effect is obtained.
In addition, the plugging agent can be added into drilling fluid together with bridging material to form a plugging slurry for plugging operation.
5 parts of the plugging agents prepared in the examples 1-4 and the comparative examples 1 and 2 and 3 parts of shells with the lengths of 3-6 mm are respectively added into 100 parts of base slurry to prepare plugging slurry, and the plugging effect of the plugging slurry is measured by adopting a sand bed filtrate instrument and an HPHT dynamic plugging instrument (see table 2), wherein the plugging modules are crack templates with the lengths of 1.0mm, 3.0mm and 5.0 mm.
Table 2 plugging properties of the plugging slurries
Claims (11)
1. A plugging agent for drilling fluid is characterized in that: the plugging agent for the drilling fluid comprises the following components:
58-90 parts of high-elastic modified asphalt particles;
5-21 parts of fiber materials;
5-21 parts of graphite material;
the high-elastic modified asphalt particles have a core-shell structure, take rubber powder as a core and take modified asphalt as a shell; the modified asphalt is obtained by reacting grafted activated asphalt with volcanic ash; the weight of the modified asphalt is 85-95% of the grafted activated asphalt, and the weight of the volcanic ash is 5-15%;
the preparation method of the modified asphalt comprises the following steps: heating base asphalt to a molten state, adding organic acid anhydride, introducing inert gas to maintain the pressure of an asphalt reaction kettle at 0.2-1.0 MPa, reacting at 150-250 ℃ for 2-8 hours to obtain grafted activated asphalt; adding volcanic ash into the grafted activated asphalt, and mixing and reacting for 30-180 minutes at the temperature of 150-180 ℃ to obtain the modified asphalt.
2. The plugging agent for drilling fluids according to claim 1, wherein: based on the weight of the high-elasticity modified asphalt particles, the modified asphalt accounts for 70-90 percent, and the rubber powder accounts for 10-30 percent.
3. The plugging agent for drilling fluids according to claim 1, wherein: the rubber powder is one or more of butyl rubber powder, nitrile rubber powder, chloroprene rubber powder, styrene-butadiene rubber powder or fluorine-containing rubber powder; the particle size of the rubber powder is 60-200 meshes.
4. The plugging agent for drilling fluids according to claim 1, wherein: the organic acid anhydride is at least one selected from maleic anhydride, polyglycolic anhydride, polyglutaric anhydride, polyazelaic anhydride and polyisobutylene succinic anhydride; the base asphalt is one or more of vacuum residuum, oxidized asphalt, blended asphalt, solvent deasphalted and natural asphalt, and the softening point of the base asphalt is 60-90 ℃; wherein the addition amount of the organic acid anhydride accounts for 2-20% of the weight of the basic asphalt.
5. The plugging agent for drilling fluids according to claim 1, wherein: the volcanic ash is superfine volcanic ash with the grain diameter of 200-800 nm, and the sulfur content is more than or equal to 5wt%.
6. The plugging agent for drilling fluids according to claim 5, wherein: the sulfur content of the volcanic ash is 6-15%.
7. The plugging agent for drilling fluids according to claim 1, wherein: the high-elastic modified asphalt particles are prepared by the following method: firstly preparing modified asphalt, then adding rubber powder, fully shearing, and then freezing and crushing to obtain high-elasticity modified asphalt particles.
8. The plugging agent for drilling fluids according to claim 1, wherein: the fiber material is regenerated fiber, including one or more of regenerated cellulose fiber, regenerated protein fiber and regenerated starch fiber; the length of the fiber material is 0.5-3.0 mm.
9. The plugging agent for drilling fluids according to claim 1, wherein: the graphite material is at least one of flake graphite, elastic graphite or expanded graphite.
10. A method of preparing a lost circulation additive for drilling fluids according to any one of claims 1 to 9, comprising: and uniformly mixing the fiber material, the high-elastic modified asphalt particles and the graphite material according to a proportion to obtain the plugging agent for the drilling fluid.
11. Use of a plugging agent for drilling fluids according to any one of claims 1-9 in oil-based drilling fluids.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011160096.XA CN114479779B (en) | 2020-10-27 | 2020-10-27 | Plugging agent for drilling fluid and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011160096.XA CN114479779B (en) | 2020-10-27 | 2020-10-27 | Plugging agent for drilling fluid and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114479779A CN114479779A (en) | 2022-05-13 |
| CN114479779B true CN114479779B (en) | 2023-07-28 |
Family
ID=81470702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011160096.XA Active CN114479779B (en) | 2020-10-27 | 2020-10-27 | Plugging agent for drilling fluid and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114479779B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724383A (en) * | 2008-10-15 | 2010-06-09 | 中国石油天然气股份有限公司 | Drilling fluid plugging agent while drilling |
| CN102304353A (en) * | 2011-07-08 | 2012-01-04 | 克拉玛依市金鑫科技有限公司 | Environmental-friendly type oil-based drilling fluid and preparation method thereof |
| CN110922773A (en) * | 2018-09-20 | 2020-03-27 | 中国石油化工股份有限公司 | Modified epoxy asphalt particles, water-in-oil base drilling fluid and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10221636B2 (en) * | 2017-03-02 | 2019-03-05 | Baker Hughes, A Ge Company, Llc | Polymer-modified asphalt for drilling fluid applications |
-
2020
- 2020-10-27 CN CN202011160096.XA patent/CN114479779B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724383A (en) * | 2008-10-15 | 2010-06-09 | 中国石油天然气股份有限公司 | Drilling fluid plugging agent while drilling |
| CN102304353A (en) * | 2011-07-08 | 2012-01-04 | 克拉玛依市金鑫科技有限公司 | Environmental-friendly type oil-based drilling fluid and preparation method thereof |
| CN110922773A (en) * | 2018-09-20 | 2020-03-27 | 中国石油化工股份有限公司 | Modified epoxy asphalt particles, water-in-oil base drilling fluid and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114479779A (en) | 2022-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110628398B (en) | Water-based drilling fluid for shale gas well and production method thereof | |
| CN101851491B (en) | Method for preparing fluid loss additive for drilling fluid | |
| CN112877045B (en) | Bulk-swelling efficient slug gel plugging agent and preparation method thereof | |
| CN106675535A (en) | Environment-friendly water-based drilling fluid and preparation method thereof | |
| CN114479778B (en) | Plugging agent for oil-based drilling fluid and application | |
| MX2012003760A (en) | Sealant compositions comprising diutan and associated methods. | |
| CN112745814B (en) | Plugging agent for oil-based drilling fluid and application | |
| CN107629768B (en) | Ultrahigh-temperature-resistant water-based drilling fluid | |
| CN109021940B (en) | High-temperature high-density high-performance environment-friendly water-based drilling fluid and preparation method thereof | |
| CN106118621B (en) | A kind of polyethers hydramine drilling fluid | |
| CN108728053B (en) | Environment-friendly temperature-resistant salt-resistant plugging fluid loss additive for low-solid-phase brine drilling fluid and preparation method thereof | |
| CN113736435A (en) | Nano microemulsion plugging agent for drilling fluid and preparation method thereof | |
| EP3433335A1 (en) | In situ generation of nano-clay drilling fluid | |
| CN114214046A (en) | High-temperature-resistant modified manganese dioxide nano plugging agent and oil-based drilling fluid | |
| CN114479779B (en) | Plugging agent for drilling fluid and preparation method thereof | |
| CN111793477B (en) | Water-based drilling fluid | |
| CN113773819B (en) | Water-based drilling fluid and application thereof | |
| CN114479790B (en) | Plugging agent for oil-based drilling fluid and preparation method and application thereof | |
| CN113122199B (en) | Medium-high temperature strong-plugging hard rubber micro-foam drilling fluid and preparation method thereof | |
| CN112745817B (en) | Plugging agent for drilling fluid and application | |
| CN117285921A (en) | Synthetic base fracturing fluid, preparation method and application thereof | |
| CN110922946B (en) | Modified epoxy asphalt particles, full-oil-based drilling fluid and preparation method thereof | |
| CN113429948A (en) | Low-friction water-based drilling fluid and preparation method thereof | |
| CN111171796A (en) | Environment-friendly high-temperature-resistant salt-resistant calcium-modified natural polymer filtrate reducer | |
| CN113444502B (en) | Multifunctional liquid for drilling well, drilling fluid for shale gas, and preparation method and application 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 | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231225 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: Sinopec (Dalian) Petrochemical Research Institute Co.,Ltd. Address before: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: DALIAN RESEARCH INSTITUTE OF PETROLEUM AND PETROCHEMICALS, SINOPEC Corp. |