CN108728064B - Aluminum-based plugging treating agent for drilling fluid and preparation method thereof - Google Patents
Aluminum-based plugging treating agent for drilling fluid and preparation method thereof Download PDFInfo
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- 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
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- 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
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Abstract
The invention relates to an aluminum-based plugging treating agent for drilling fluid and a preparation method thereof, belonging to the field of chemical additives of oil and gas fields. The aluminum-based plugging treating agent for the drilling fluid is prepared from components including inorganic aluminum, a surface modifier and a dispersing agent; the weight ratio of the inorganic aluminum to the surface modifier is 10-500: 1; the weight ratio of the inorganic aluminum to the dispersing agent is 50-500: 1. the surface modifier is selected from at least one of stearic acid, sodium stearate, magnesium stearate, sodium dodecyl benzene sulfonate, sodium metaphosphate and sodium pyrophosphate. The dispersing agent is selected from at least one of starch, sodium carboxymethyl cellulose, polyanionic cellulose and xanthan gum. The aluminum-based plugging treating agent for the drilling fluid is in a liquid type, is easier to use, does not cause dust problem, and can effectively solve the problem of outstanding compatibility of the conventional aluminum-based treating agent in a drilling fluid system.
Description
Technical Field
The invention relates to the field of chemical additives for oil and gas fields, in particular to an aluminum-based plugging treating agent for drilling fluid and a preparation method thereof.
Background
With increasingly complex conditions of stratum encountered during drilling, the drilling operation has higher requirements on the anti-collapse performance of drilling fluid and the capability of strengthening the well wall. The plugging anti-collapse treating agent can block the channels of hydration by plugging primary pores and microcracks of the stratum, improve the plugging capability of the drilling fluid, reduce the invasion of free water in the drilling fluid into the stratum, and reduce the collapse pressure of the stratum, thereby playing a role in stabilizing the well wall. The plugging and anti-collapse treating agent mainly comprises asphalt treating agents such as emulsified asphalt, sulfonated asphalt, oxidized asphalt and the like, and treating agents such as silicate, polymer alcohol and the like.
The asphalt treating agent is produced by using asphalt grains in the treating agent to soften and deform at the temperature near the softening point and to be squeezed into cracks and pores of stratum under the action of pressure difference to block the cracks and pores in well wall and to realize collapse preventing effect. However, the anti-collapse effect of the asphalt treating agent is greatly influenced by the softening point of the raw material asphalt, the effective action temperature is the temperature near the softening point, and the formation microcracks are difficult to be effectively blocked in a broad-spectrum temperature range. Silicate treating agents such as sodium silicate, potassium silicate and methyl silicate can form ions, colloids and high-molecular nano-scale particles with different sizes in water, and a layer of protective film is formed on the surface of stratum rock through the actions of adsorption, diffusion, chemical precipitation and the like to plug stratum microcracks. The polyalcohol and the conventional drilling fluid treating agent have good compatibility, are biodegradable, low-toxic or nontoxic, have the characteristic of environmental friendliness, and have low fluorescence, so that the oil-gas layer can be identified and found. However, the cloud point temperature limits, the effective action temperature range of the polyalcohol treating agent is limited, and the cloud point temperature is required to be equivalent to the bottom circulation temperature so as to effectively improve the anti-collapse performance of the drilling fluid. And the polyalcohol treating agent is a nonionic surfactant, which often causes the problem of foaming of the drilling fluid to be prominent.
The aluminum compound has unique physical and chemical properties, can generate morphological change according to different pH values, and can weaken the expansion of the shale, plug pore throats and microcracks and strengthen the well wall through the actions of electrical neutralization, ion adsorption and chemical precipitation. In recent years, research and application of aluminum-based drilling fluid anti-sloughing treating agents have become one of the hot spots in the field of drilling fluid research. The existing aluminum-based treating agent mainly comprises AlCl3·6H2O、Al2(SO4)3·18H2O、KAl(SO4)2·12H2O and NaAlO2Iso-inorganic salts and some aluminum-based drilling fluidsA treatment agent product. US 5110484a uses sodium aluminate to react with syrup to synthesize an aluminum compound, which controls the hydration dispersion of shale. Liuwei, etc. react with aluminum compound, stabilizer and chelating agent at certain temperature, and then are neutralized, dried and crushed to obtain the aluminum compound mudstone inhibitor WJ-1 (Liuwei, etc. high-performance aluminum compound drilling fluid system research, drilling fluid and completion fluid, 2011,28(1): 18-23). The technology needs a crushing process, is a solid treating agent, has low compatibility with a drilling fluid system, and can influence the rheological property of the drilling fluid in use.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an aluminum-based plugging treating agent for drilling fluid. In particular to an aluminum-based plugging treating agent for drilling fluid and a preparation method thereof. The aluminum-based plugging treating agent for the drilling fluid is a liquid treating agent, and drying and crushing are not needed. The aluminum-based plugging treating agent for the drilling fluid is prepared by neutralizing, modifying and dispersing inorganic aluminum, an organic modifier and a dispersing agent under certain conditions, and can effectively plug stratum microcracks and enhance the stability of well walls.
One purpose of the invention is to provide an aluminum-based plugging treating agent for drilling fluid, which is prepared from components including inorganic aluminum, a surface modifier and a dispersant;
the weight ratio of the inorganic aluminum to the surface modifier is 10-500: 1, more preferably 20 to 200: 1;
the weight ratio of the inorganic aluminum to the dispersing agent is 50-500: 1, more preferably 80 to 200: 1.
the inorganic aluminum can be selected from AlCl3·6H2O、Al2(SO4)3、Al2(SO4)3·18H2O、KAl(SO4)2、KAl(SO4)2·12H2O、AlCl3Preferably AlCl3、AlCl3·6H2O、Al2(SO4)3、Al2(SO4)3·18H2O、KAl(SO4)2、KAl(SO4)2·12H2At least one of O.
The surface modifier can be selected from at least one of stearic acid, sodium stearate, magnesium stearate, sodium dodecyl benzene sulfonate, sodium metaphosphate and sodium pyrophosphate, and preferably at least one of stearic acid, sodium stearate and sodium pyrophosphate.
The dispersing agent can be selected from at least one of starch, sodium carboxymethyl cellulose, polyanionic cellulose and xanthan gum, and preferably at least one of sodium carboxymethyl starch, sodium carboxymethyl cellulose and xanthan gum.
The invention also aims to provide a preparation method of the aluminum-based plugging treating agent for the drilling fluid, which comprises the following steps: the aluminum-based composite material is prepared by neutralizing, modifying and dispersing components containing the inorganic aluminum, the surface modifier and the dispersant.
Specifically, firstly, inorganic aluminum and alkali are subjected to a neutralization reaction, the reaction is controlled to be carried out by regulating the pH value to be 7-8, a milky aluminum compound suspension is obtained, further, surface modification and dispersion treatment are carried out by a surface modifier and a dispersing agent, and the reaction time and the reaction temperature are controlled, so that the milky aluminum-based plugging treating agent for the liquid drilling fluid is prepared.
And the neutralization step is to neutralize the reaction solution by using alkali and inorganic aluminum until the pH value of the reaction solution is 7-8. The alkali is selected from NaOH, KOH and Na with the weight fraction of 5-40%2CO3、Ca(OH)2At least one of the solutions, preferably 10-30% NaOH or KOH solution.
In the neutralization step, the neutralization reaction temperature of the inorganic aluminum and the alkali is 10-80 ℃, more preferably 10-40 ℃, and the reaction time is 0.5-24 h, more preferably 1-12 h.
The modification and dispersion temperatures are 10-100 ℃, and preferably 50-90 ℃. The reaction time is 0.5-12 h, preferably 1-6 h.
Effects of the invention
The invention utilizes inorganic aluminum compound to carry out treatments such as in-situ neutralization, modification, dispersion and the like, thereby obtaining the liquid aluminum-based plugging agent which is simple to synthesize and does not need drying and crushing, and the liquid aluminum-based plugging agent can effectively plug stratum microcracks and enhance the stability of well walls. The plugging treating agent is in a liquid type, is more convenient to use on site, does not cause dust problem, can effectively solve the problem that the compatibility of the current aluminum-based treating agent in a drilling fluid system is outstanding, has good compatibility with the drilling fluid system, and does not influence the rheological property of the drilling fluid. The drilling fluid can be widely applied to water-based drilling fluid, strengthens the stability of a well wall, and meets the requirements of complex stratum exploration and development. And the preparation method is simple, easy to operate, free of drying and crushing processes, easy to control reaction temperature, full in reaction, low in production cost, stable in product quality and easy to industrialize.
Drawings
FIGS. 1 and 2 are appearance diagrams of aluminum-based plugging treatment agents for drilling fluids prepared in examples 1 to 6 of the present application; all are milky white liquids.
Detailed Description
The present invention will be further described with reference to the following examples. However, the present invention is not limited to these examples.
Example 1
50g of AlCl was added to a 250mL three-necked flask3·6H2And (3) controlling the temperature of O and 50mL of water to 40 ℃, dropwise adding a 5% NaOH solution through a dropping funnel to perform a neutralization reaction until the pH value is 7, fully reacting for 1h, heating to 80 ℃, sequentially adding 0.8g of stearic acid, 0.2g of sodium dodecyl benzene sulfonate and 0.25g of sodium carboxymethyl starch, reacting for 0.5h, and cooling to room temperature to obtain 150mL of the aluminum-based plugging treating agent for the liquid drilling fluid.
Example 2
In a 250mL three-necked flask, 50g of Al was added2(SO4)3·18H2And (3) controlling the temperature of O and 50mL of water, dropwise adding 40% NaOH solution through a dropping funnel to neutralize the water so that the pH value of the reaction solution is 8, fully reacting for 0.5h, continuously controlling the temperature to be 10 ℃, sequentially adding 5g of magnesium stearate and 1g of sodium carboxymethylcellulose, and reacting for 6h to obtain 135mL of the aluminum-based plugging treating agent for the liquid drilling fluid.
Example 3
In a 250mL three-necked bottle, add50g of KAl (SO)4)2·12H2And O and 50mL of water are controlled at the temperature of 10 ℃, 30% KOH solution is dripped through a dropping funnel to neutralize until the pH value is 7, the temperature is raised to 50 ℃ after the full reaction is carried out for 24 hours, 0.25g of sodium pyrophosphate and 0.1g of xanthan gum are sequentially added, and the reaction is carried out for 1 hour, so that 140mL of the aluminum-based plugging treating agent for the liquid drilling fluid can be obtained.
Example 4
50g of AlCl was added to a 500mL three-necked flask350mL of water, controlling the temperature at 30 ℃, and dropwise adding 20% Na through a dropping funnel2CO3And neutralizing the solution until the pH value is 8, fully reacting for 12h, heating to 100 ℃, sequentially adding 2.5g of sodium metaphosphate and 0.625g of starch, reacting for 3h, and cooling to room temperature to obtain 200mL of the liquid aluminum-based plugging treating agent for the drilling fluid.
Example 5
50g of AlCl was added to a 500mL three-necked flask3·6H2O, 50mL of water, temperature-controlled 20 ℃, 10% Ca (OH) was added dropwise through a dropping funnel2The solution is neutralized to pH 8, after the solution fully reacts for 8 hours, the temperature is raised to 90 ℃, 2.5g of sodium stearate, 0.5g of polyanionic cellulose and 0.5g of sodium carboxymethyl starch are sequentially added, after the reaction is carried out for 12 hours, the temperature is lowered to room temperature, and 240mL of the aluminum-based plugging treating agent for the liquid drilling fluid can be obtained.
Example 6
In a 5000mL three-necked flask, 400g of AlCl was added3·6H2O and 100g Al2(SO4)3·18H2And (2) controlling the temperature to be 25 ℃ by O and 1000mL of water, dropwise adding a mixed solution of 20% NaOH and 20% KOH through a dropping funnel to neutralize until the pH value is 7.5, fully reacting for 6 hours, heating to 85 ℃, sequentially adding 5.0g of sodium stearate and 5.0g of xanthan gum, reacting for 2.5 hours, and cooling to room temperature to obtain 2500mL of the aluminum-based plugging treating agent for the liquid drilling fluid.
Compatibility and plugging property evaluation test
The test method is a GB/T16783 water-based drilling fluid field test program:
the aluminum-based plugging treatment agent for drilling fluid prepared in examples 1 to 6 and the commercially available inorganic aluminum commodity AlCl in China were tested by the following methods3·6H2O (asComparative example 1), commercial inorganic aluminum commercial Al in China2(SO4)3·18H2O (as comparative example 2), aluminum-based treating agent MAX-PLEX commercially available at foreign countriesTM(Beckhols Corp.) (as comparative example 3) was subjected to performance evaluation.
The test method comprises the following steps: two portions of 350mL distilled water are accurately measured, 1.05g of soda ash is added into each portion, 3.5g of sample is added into one portion, and the mixture is stirred at a high speed for 5 min. Adding 35g of bentonite into the two solutions respectively, stirring at high speed for 20min, wherein stopping at least twice to scrape off clay adhered to the container. The plastic viscosity and the dynamic shear force of the drilling fluid are tested by a six-speed rotational viscometer, the filter pressure loss is measured by a medium pressure filter loss meter, and the pH value of the filtrate is measured by pH test paper. The results are shown in Table 1.
TABLE 1 Performance parameter index of aluminum-based plugging treatment agent for liquid drilling fluid
As can be seen from Table 1, the aluminum-based treating agent AlCl is comparable to the conventional aluminum-based treating agent3·6H2O、Al2(SO4)3·18H2Compared with the aluminum base treating agent (examples 1 to 6), the aluminum base treating agent prepared by the invention has good compatibility, the rheological property of the base slurry does not change greatly before and after the aluminum base treating agent is added, the plastic viscosity and the dynamic shear force of the base slurry before the aluminum base treating agent is added are respectively 4mPa.s and 7.5Pa, and the plastic viscosity and the dynamic shear force of the aluminum base treating agent after the aluminum base treating agent is added are respectively 4.5-5.5 mPa.s and 6-8 Pa. And the filtration loss is remarkably reduced, which shows that the aluminum-based treating agent can effectively block the formation microcracks and improve the stability of the well wall, and the indexes are all superior to the existing aluminum-based treating agent AlCl3·6H2O、Al2(SO4)3·18H2MAX-PLEX aluminum-based treating agent sold in O and foreign countriesTM(Beckhols corporation).
Claims (7)
1. An aluminum-based plugging treating agent for drilling fluid is prepared from inorganic aluminum, a surface modifier and a dispersing agent;
the weight ratio of the inorganic aluminum to the surface modifier is 20-200: 1;
the weight ratio of the inorganic aluminum to the dispersing agent is 80-200: 1;
the surface modifier is selected from at least one of sodium stearate and magnesium stearate;
the dispersing agent is selected from at least one of sodium carboxymethyl starch, sodium carboxymethyl cellulose and xanthan gum;
the inorganic aluminum is selected from AlCl3·6H2O、Al2(SO4)3、Al2(SO4)3·18H2O、KAl(SO4)2、KAl(SO4)2·12H2O、AlCl3At least one of;
the aluminum-based plugging treating agent for the drilling fluid is prepared by the following steps: the aluminum-based composite material is prepared by neutralizing, modifying and dispersing components containing the inorganic aluminum, the surface modifier and the dispersant;
the neutralization step is to adjust the pH of the reaction solution to be 7-8 by using alkali;
the reaction temperature of the neutralization step is 10-80%oC；
The modification and dispersion temperatures are 10-100 DEGoC。
2. The aluminum-based plugging treatment agent for drilling fluid, according to claim 1, is characterized in that:
the surface modifier is selected from sodium stearate.
3. The preparation method of the aluminum-based plugging treating agent for the drilling fluid according to any one of claims 1 to 2, characterized by comprising the following steps: the aluminum-based composite material is prepared by neutralizing, modifying and dispersing components containing the inorganic aluminum, the surface modifier and the dispersant.
4. The preparation method of the aluminum-based plugging treating agent for the drilling fluid, according to claim 3, is characterized in that:
the alkali is selected from NaOH, KOH and Na2CO3、Ca(OH)2At least one of the solutions.
5. The preparation method of the aluminum-based plugging treating agent for the drilling fluid, according to claim 4, is characterized in that:
the alkali is at least one of NaOH or KOH solution.
6. The preparation method of the aluminum-based plugging treating agent for the drilling fluid, according to claim 3, is characterized in that:
the modification and dispersion temperatures are both 50-90 DEG CoC。
7. The preparation method of the aluminum-based plugging treating agent for the drilling fluid, according to claim 3, is characterized in that:
the reaction temperature of the neutralization step is 10-40%oC。
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| CN111139040B (en) * | 2018-11-06 | 2022-05-03 | 中国石油化工股份有限公司 | Temperature response type aluminum-based plugging treating agent for drilling fluid and preparation method thereof |
| CN110105507B (en) * | 2019-04-16 | 2021-06-18 | 安徽中科日升科技有限公司 | Nano aluminum complex, preparation method and application thereof |
| CN116064014B (en) * | 2021-11-01 | 2024-02-23 | 中国石油化工股份有限公司 | Stratum environment molecular recognition response type well wall stabilizing material and preparation method and application thereof |
| CN116063998B (en) * | 2022-07-08 | 2024-05-14 | 中国石油天然气集团有限公司 | Aluminum-based plugging anti-collapse agent and preparation method and application thereof |
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