CN109468124B - Environment-friendly low-fluorescence asphalt-like plugging agent - Google Patents
Environment-friendly low-fluorescence asphalt-like plugging agent Download PDFInfo
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- CN109468124B CN109468124B CN201710815622.3A CN201710815622A CN109468124B CN 109468124 B CN109468124 B CN 109468124B CN 201710815622 A CN201710815622 A CN 201710815622A CN 109468124 B CN109468124 B CN 109468124B
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 30
- 238000005553 drilling Methods 0.000 claims abstract description 30
- 239000002981 blocking agent Substances 0.000 claims abstract description 25
- 239000004952 Polyamide Substances 0.000 claims abstract description 17
- 235000013873 oxidized polyethylene wax Nutrition 0.000 claims abstract description 17
- 239000004209 oxidized polyethylene wax Substances 0.000 claims abstract description 17
- 229920002647 polyamide Polymers 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 16
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 16
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 15
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 5
- 239000011148 porous material Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 229940068918 polyethylene glycol 400 Drugs 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 22
- 230000036571 hydration Effects 0.000 abstract description 4
- 238000006703 hydration reaction Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000011085 pressure filtration Methods 0.000 abstract description 3
- 231100000614 poison Toxicity 0.000 abstract description 2
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 abstract description 2
- 239000003440 toxic substance Substances 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract 1
- 239000001993 wax Substances 0.000 description 11
- 239000010426 asphalt Substances 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 5
- 238000009775 high-speed stirring Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000440 bentonite Substances 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 231100000605 Toxicity Class Toxicity 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000013074 reference sample Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 235000010493 xanthan gum Nutrition 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
- 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
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
-
- 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
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Inorganic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Sealing Material Composition (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses an environment-friendly low-fluorescence asphalt-like plugging agent. The blocking agent comprises the following components in percentage by mass: 10-20% of polyamide wax powder, 20-25% of oxidized polyethylene wax, 5-8% of polyaluminium chloride, 20-25% of polyethylene glycol, 2-5% of sodium dodecyl benzene sulfonate, 10-15% of nano calcium carbonate and the balance of water. The plugging agent has low fluorescence, does not contain toxic substances such as polycyclic aromatic hydrocarbon and the like, does not influence geological logging, has good environmental protection performance and certain hydration capacity, can prevent the hydration dispersion of shale particles when being adsorbed on a shale interface, plays a role in preventing collapse, can fill pore throats and cracks to play a role in plugging when being insoluble in water, can cover the shale interface, and improves the quality of mud cakes, thereby reducing the high-temperature and high-pressure filtration loss of drilling fluid and improving the plugging capacity of the drilling fluid.
Description
Technical Field
The invention belongs to the field of petroleum drilling, and relates to an environment-friendly low-fluorescence asphalt-like plugging agent.
Background
With the expansion of the exploration field to new areas, drilling of formations to be met is becoming more and more complex, and the problem of instability of well walls is becoming more and more serious. The shrinkage and collapse of shale, coal beds, pre-mountain construction belts and salt-gypsum layers can cause instability of well walls, affect the drilling speed and the well logging and cementing quality, even cause that partial areas can not drill a target layer, and affect the realization of exploration and development purposes. The anti-collapse agent mainly comprises inorganic salts, asphalts, humic acids and polymers, wherein the plugging type anti-collapse agent mainly comprises asphalts, polymeric alcohols, aluminum compounds and silicates. Asphalt is an ideal anti-collapse agent which is generally accepted at present, but for drilling in new areas, the asphalt anti-collapse agent is forbidden by geological departments due to high fluorescence level, and in addition, the asphalt blocking agent has high toxicity and is difficult to biodegrade; the effective content of the emulsified paraffin is low, the plugging effect is limited, the particles of the polymer alcohol which are transformed from the phase due to the cloud point effect are too few, the anti-collapse plugging requirement cannot be met, and the emulsified paraffin and the polymer alcohol mainly play roles in lubrication and partial inhibition. Therefore, the development of a novel efficient anti-collapse agent with low fluorescence and plugging and inhibiting effects has good application prospect.
Disclosure of Invention
The invention aims to provide an environment-friendly low-fluorescence asphalt-like plugging agent.
The blocking agent provided by the invention comprises the following components in percentage by mass: 10-20% of polyamide wax powder, 20-25% of oxidized polyethylene wax, 5-8% of polyaluminium chloride, 20-25% of polyethylene glycol, 2-5% of sodium dodecyl benzene sulfonate, 10-15% of nano calcium carbonate and the balance of water.
The plugging agent can also consist of the components in percentage by mass.
In the plugging agent, the polyamide wax powder and the oxidized polyethylene wax are resins which can be softened at a certain temperature, are similar to asphalt, and can be used in combination to plug microcracks and microporosities at different formation temperatures when being applied to well drilling due to different melting point temperatures, so that the collapse and leakage of a well wall are prevented; the polyethylene glycol and the nano calcium carbonate are used for plugging the nano pore throat of the formation shale, so that the plugging compactness and the plugging efficiency of the plugging agent to the formation are improved; the polyaluminium chloride plays a role in inhibiting hydration expansion and collapse prevention of clay in a stratum in the plugging agent; the sodium dodecyl benzene sulfonate plays a role in dispersing in the plugging agent, so that the lipophilic polyamide wax powder and the oxidized polyethylene wax can be quickly dispersed in the water-based drilling fluid.
The melting point of the polyamide wax powder is 146-150 ℃;
the melting point of the oxidized polyethylene wax is 80-100 ℃;
the polyethylene glycol can be specifically polyethylene glycol 400;
the particle size of the nano calcium carbonate is 40-70 nm.
The structural formula of the sodium dodecyl benzene sulfonate is shown as a formula I:
specifically, the blocking agent can be a blocking agent a, a blocking agent b or a blocking agent c;
the blocking agent a comprises the following components in percentage by mass:
10% of polyamide wax powder, 20% of oxidized polyethylene wax, 5% of polyaluminum chloride, 20% of polyethylene glycol, 2% of sodium dodecyl benzene sulfonate, 10% of nano calcium carbonate and 33% of water.
The blocking agent b comprises the following components in percentage by mass:
15% of polyamide wax powder, 25% of oxidized polyethylene wax, 8% of polyaluminum chloride, 25% of polyethylene glycol, 3% of sodium dodecyl benzene sulfonate, 15% of nano calcium carbonate and 9% of water.
The blocking agent c comprises the following components in percentage by mass:
20% of polyamide wax powder, 20% of oxidized polyethylene wax, 5% of polyaluminum chloride, 20% of polyethylene glycol, 5% of sodium dodecyl benzene sulfonate, 15% of nano calcium carbonate and 15% of water.
The method for preparing the plugging agent provided by the invention comprises the following steps:
the components are uniformly mixed according to the proportion, stirred at the temperature of 100-140 ℃, cooled to normal temperature and stirred to obtain the composition.
In the method, the time in the stirring step at 140 ℃ under 100 ℃ is 40-80 minutes, and specifically can be 60 minutes; the temperature can be specifically 120 ℃;
in the normal-temperature stirring step, the time is 20-40 minutes, specifically 30 minutes.
The method further comprises the steps of: after the normal-temperature stirring step, the product is dried, crushed, granulated and sieved.
In the drying step, the temperature is 100-120 ℃; the time is 120-240 minutes, and specifically 180 minutes;
in the screening step, the mesh number of the screen holes is 180-240 meshes, and specifically can be 200 meshes.
The application of the plugging agent provided by the invention in plugging also belongs to the protection scope of the invention. Wherein the plugging is a drilling plugging.
Aiming at the limitation of the traditional plugging agent, the invention provides an environment-friendly easily-degradable asphalt-like low-fluorescence plugging agent. The modified product is a modified product which is formed by introducing strong hydrophilic groups into oil-soluble substances with different softening points through a special process, has a certain hydration effect, and can prevent shale particles from being hydrated and dispersed when the modified product is adsorbed on a shale interface, thereby playing a role in preventing collapse. Meanwhile, the water-insoluble part has the characteristic of multiple softening points, can fill and plug the pore throats and cracks of stratum with different well temperatures to play a plugging role, can cover a shale interface, and improves the quality of mud cakes, so that the high-temperature and high-pressure filtration loss of the drilling fluid is reduced, and the plugging capability of the drilling fluid is improved. The blocking agent has low fluorescence, is nontoxic, does not contain toxic substances such as polycyclic aromatic hydrocarbon and the like, is easy to biodegrade, is harmless to the environment, has good environmental protection performance, and is an ideal substitute product of the asphalt blocking agent. Meanwhile, the plugging agent has no adverse effect on the rheological property of a drilling fluid system, can effectively reduce the high-temperature and high-pressure filtration loss of the drilling fluid, improves the quality of mud cakes, has good compatibility with other treating agents in the system, and can be used for different water-based drilling fluid systems.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples, but the present invention is not limited to the following examples. The method is a conventional method unless otherwise specified. The starting materials are commercially available from the open literature unless otherwise specified. The melting point of the polyamide wax powder used in the following examples is 146-150 ℃; the melting point of the oxidized polyethylene wax is 80-100 ℃; the polyethylene glycol is polyethylene glycol 400.
Examples 1,
The blocking agent a comprises the following components in percentage by mass:
10 percent of polyamide wax powder,
20 percent of oxidized polyethylene wax,
5 percent of polyaluminium chloride,
20 percent of polyethylene glycol,
2 percent of sodium dodecyl benzene sulfonate,
10 percent of nano calcium carbonate with the grain diameter of 40-70nm,
the balance being water.
The components are sequentially put into a reaction kettle according to the arrangement sequence under the condition of stirring, the temperature is raised to 120 ℃, the mixture is stirred for 60 minutes at a constant temperature, all the components are completely and uniformly mixed, then the mixture is cooled to normal temperature and normal pressure, stirred for 30 minutes at a high speed and discharged, dried for 180 minutes at 120 ℃, crushed and granulated, and then sieved by a 200-mesh sieve.
Examples 2,
The blocking agent b comprises the following components in percentage by mass:
15 percent of polyamide wax powder,
25 percent of oxidized polyethylene wax,
8 percent of polyaluminium chloride,
25 percent of polyethylene glycol,
3 percent of sodium dodecyl benzene sulfonate,
15 percent of nano calcium carbonate with the grain diameter of 40-70nm,
the balance being water.
The preparation method is the same as that of the example 1, and only the dosage of each component is replaced correspondingly.
Examples 3,
The blocking agent c comprises the following components in percentage by mass:
20 percent of polyamide wax powder,
20 percent of oxidized polyethylene wax,
5 percent of polyaluminium chloride,
20 percent of polyethylene glycol,
5 percent of sodium dodecyl benzene sulfonate,
15 percent of nano calcium carbonate with the grain diameter of 40-70nm,
the balance being water.
The preparation method is the same as that of the example 1, and only the dosage of each component is replaced correspondingly.
In the embodiments 1-3, the prepared environment-friendly easily-degradable asphalt-like low-fluorescence plugging agent is used for preparing drilling fluid and detecting the performance of the drilling fluid according to the following procedures, and the specific performance test refers to the GB/T16783.1-2006 on-site test of petroleum and natural gas industrial drilling fluid part 1, namely water-based drilling fluid.
1. Base stock preparation procedure
1) Adding 8g of bentonite into 400ml of fresh water in a high stirring cup, and stirring at a low speed until the bentonite is completely dispersed;
2) adding 0.8g of sodium hydroxide, stirring at a high speed for 20min, and maintaining for 24 h;
3) stirring the well-maintained bentonite mixture at 10000r/min at a high speed for 10 min;
4) adding 1.2g of polyanionic cellulose, 4g of carboxymethyl starch and 0.4g of xanthan gum under the condition of 10000r/min high-speed stirring, and stirring for 20min to obtain base slurry;
5) 4 cups of base stock are prepared according to the method and are marked as No. 1, No. 2, No. 3 and No. 4 base stock.
2. Drilling fluid preparation procedure
1) Taking No. 1 base slurry, adding 8g of the environment-friendly easily-degradable asphalt-like low-fluorescence plugging agent prepared in the example 1 under the condition of 10000r/min high-speed stirring, and stirring for 20min at a high speed to prepare the drilling fluid No. 1;
2) taking No. 2 base slurry, adding 8g of the environment-friendly easily-degradable asphalt-like low-fluorescence plugging agent prepared in the embodiment 2 under the condition of 10000r/min high-speed stirring, and stirring for 20min at a high speed to prepare a drilling fluid No. 2;
3) taking No. 3 base slurry, adding 8g of the environment-friendly easily-degradable asphalt-like low-fluorescence plugging agent prepared in the embodiment 3 under the condition of 10000r/min high-speed stirring, and stirring for 20min at a high speed to prepare a drilling fluid No. 3;
4) taking No. 4 base slurry, adding 8g of sulfonated asphalt (a reference sample) under the condition of 10000r/min high-speed stirring, and stirring for 20min at a high speed to prepare the drilling fluid No. 4;
3. evaluation of drilling fluid Properties
1) The rheological property and plugging capability performance test is carried out according to the GB/T16783.1-2006 oil and gas industry drilling fluid field test part 1, namely water-based drilling fluid, and evaluation is carried out.
2) The evaluation method of the biological toxicity of the drilling fluid system refers to the petroleum group standard Q/SY 111-2007 oil field chemical agent, the biological toxicity grading and detection method of the drilling fluid luminescence bacteria method, and the toxicity grades are specifically divided as shown in Table 1:
TABLE 1 specific classification of toxicity classes
4. Results of Performance evaluation
TABLE 2 evaluation results of Performance
The low-fluorescence plugging agent prepared in the embodiment 2 has the same filtration loss as sulfonated asphalt, and can effectively plug the pore throat of a stratum and improve the stability of a well wall in a drilling process. The low fluorescence blocking agent prepared in example 2 is nontoxic, while the sulfonated asphalt blocking agent is slightly toxic and has influence on the environment. Therefore, in the above examples, the low fluorescence asphalt-like plugging agent prepared in example 2 is the best embodiment of the present invention in terms of the technical and environmental protection.
The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention, which has the same or similar technical solutions as the present invention.
Claims (10)
1. The blocking agent comprises the following components in percentage by mass:
10 to 20 percent of polyamide wax powder,
20 to 25 percent of oxidized polyethylene wax,
5 to 8 percent of polyaluminium chloride,
20 to 25 percent of polyethylene glycol,
2 to 5 percent of sodium dodecyl benzene sulfonate,
10 to 15 percent of nano calcium carbonate,
the balance being water.
2. The plugging agent of claim 1, wherein: the melting point of the polyamide wax powder is 146-150 ℃;
the melting point of the oxidized polyethylene wax is 80-100 ℃;
the polyethylene glycol is polyethylene glycol 400;
the particle size of the nano calcium carbonate is 40-70 nm;
the structural formula of the sodium dodecyl benzene sulfonate is shown as a formula I:
formula I.
3. The plugging agent according to claim 1 or 2 or wherein: the blocking agent is a blocking agent a, a blocking agent b or a blocking agent c;
the blocking agent a comprises the following components in percentage by mass:
10% of polyamide wax powder, 20% of oxidized polyethylene wax, 5% of polyaluminum chloride, 20% of polyethylene glycol, 2% of sodium dodecyl benzene sulfonate, 10% of nano calcium carbonate and 33% of water;
the blocking agent b comprises the following components in percentage by mass:
15% of polyamide wax powder, 25% of oxidized polyethylene wax, 8% of polyaluminum chloride, 25% of polyethylene glycol, 3% of sodium dodecyl benzene sulfonate, 15% of nano calcium carbonate and 9% of water;
the blocking agent c comprises the following components in percentage by mass:
20% of polyamide wax powder, 20% of oxidized polyethylene wax, 5% of polyaluminum chloride, 20% of polyethylene glycol, 5% of sodium dodecyl benzene sulfonate, 15% of nano calcium carbonate and 15% of water.
4. A method of preparing the plugging agent of any one of claims 1-3, comprising the steps of:
the components of any one of claims 1 to 3 are uniformly mixed according to the mixture ratio, stirred at the temperature of 100 ℃ and 140 ℃, and then cooled to normal temperature and stirred to obtain the composition.
5. The method of claim 4, wherein: the stirring step at the temperature of 140 ℃ is carried out for 40-80 minutes;
in the step of stirring at normal temperature, the time is 20-40 minutes.
6. The method according to claim 4 or 5, characterized in that: the method further comprises the steps of: after the normal-temperature stirring step, the product is dried, crushed, granulated and sieved.
7. The method of claim 6, wherein: in the drying step, the temperature is 100-120 ℃; the time is 120-240 minutes;
in the screening step, the mesh number of the screen holes is 180-240 meshes.
8. The method of claim 7, wherein: in the sieving step, the mesh number of the sieve pores is 200 meshes.
9. Use of the plugging agent of any one of claims 1-3 for plugging.
10. Use according to claim 9, characterized in that: the plugging is a drilling plugging.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710815622.3A CN109468124B (en) | 2017-09-08 | 2017-09-08 | Environment-friendly low-fluorescence asphalt-like plugging agent |
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|---|---|---|---|
| CN201710815622.3A CN109468124B (en) | 2017-09-08 | 2017-09-08 | Environment-friendly low-fluorescence asphalt-like plugging agent |
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| CN109468124A CN109468124A (en) | 2019-03-15 |
| CN109468124B true CN109468124B (en) | 2021-05-11 |
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| CN112778984A (en) * | 2021-02-03 | 2021-05-11 | 库尔勒同益工贸有限责任公司 | Low-fluorescence anti-collapse plugging agent for drilling fluid and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3979305A (en) * | 1972-09-29 | 1976-09-07 | Union Oil Company Of California | Low fluid loss additive composition |
| EP1939264A1 (en) * | 2006-12-27 | 2008-07-02 | Services Pétroliers Schlumberger | Low permeability cement systems for steam injection application |
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