CN115477930B - PH stabilizer for drilling fluid and application method thereof - Google Patents
PH stabilizer for drilling fluid and application method thereof Download PDFInfo
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- CN115477930B CN115477930B CN202110599403.2A CN202110599403A CN115477930B CN 115477930 B CN115477930 B CN 115477930B CN 202110599403 A CN202110599403 A CN 202110599403A CN 115477930 B CN115477930 B CN 115477930B
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- 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
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- 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
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- 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
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- 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
- C09K2208/32—Anticorrosion additives
Abstract
The invention discloses a PH stabilizer for drilling fluid and an application method thereof. The PH stabilizer for the drilling fluid comprises the following components in parts by mass: 8-12 parts of methyl alcohol amine, 2-4 parts of polydimethyl dienyl ammonium chloride, 2-4 parts of ammonia water, 1-3 parts of sodium carbonate, 1-3 parts of sodium bicarbonate, 3-5 parts of ammonium sulfate and 2-5 parts of an oxygen scavenger. The invention can be applied to deep wells with ultra-deep well temperature up to more than 180 ℃ and high CO content by adding a large-section salt paste layer 2 The acid gas stratum has the capabilities of resisting temperature, salt and acid gas pollution, can avoid corrosion of the drilling fluid by salt, and can effectively maintain the pH value of the drilling fluid at high temperature.
Description
Technical Field
The invention relates to a PH stabilizer for drilling fluid and an application method thereof, belonging to the technical field of drilling.
Background
In the using process of the drilling fluid, the pH value of the drilling fluid can be reduced due to the reasons of temperature rise, salt invasion and the like, so that the efficacy of the treating agent in the drilling fluid is affected to a certain extent, the working performance of the drilling fluid is reduced, the corrosion of a drilling tool can be aggravated, drilling accidents are caused, and the drilling cost is increased. The pH value of the drilling fluid can be reduced under the conditions of high temperature and high salt content, and the pH value can be continuously reduced along with the extension of time; the higher the temperature, the faster the pH drops, and the higher the salt content, the greater the pH drop, thereby affecting normal drilling.
The prior solution is to supplement a great amount of caustic soda to the drilling fluid, and adjust the performance of the drilling fluid after maintaining the pH value of the drilling fluid. The existing method depends on the way of supplementing a large amount of caustic soda, and has higher cost.
In addition, in publication No. CN109652034A, publication No. 2019-04-19 discloses a method for maintaining the pH value of water-based drilling fluid under the conditions of high temperature and high salt content, which comprises the following steps of adding 0.3-1.0% of pH stabilizer and 0.3-0.5% of deoxidizer based on the mass percentage of the water-based drilling fluid formula based on the prior water-based drilling fluid formula: after the water-based drilling fluid is prepared, sequentially adding a pH stabilizer and an deoxidizer; during the maintenance treatment, the two treatments are added in proportion, with the oxygen scavenger added last. The pH stabilizer is methyl monoethanolamine, methyl diethanolamine or dimethyl ethanolamine. The method can relieve the descending amplitude of the pH value of the water-based drilling fluid under the conditions of high temperature and high salt content, so that the pH value of the water-based drilling fluid is kept relatively stable, the underground complex caused by the failure of a treating agent, the corrosion of a drilling tool and the like due to the descending of the pH value of the drilling fluid is prevented, the condition that the pH value of the drilling fluid is maintained by supplementing a large amount of caustic soda under the conditions of high temperature and high salt content is also reduced, and the effects of reducing the cost and enhancing the efficiency are achieved. But it has major problems: (1) The temperature resistance is limited, the degradation temperature of the alcohol amine derivative PH stabilizer is about 130 ℃, and for ultra-deep wells, the bottom hole temperature is often more than 180 ℃, and the current drilling requirements are not met; (2) CO resistance 2 The acid gas has limited pollution capability, while the alcohol amine derivative can remove sulfur-containing impurities in the drilling process, the alcohol amine derivative can remove CO 2 Acid gas absorption capacity is limited for high CO content 2 A gas formation has limited pH stabilization effects; (3) The pH stabilizer of alcohol amine derivative can not ionize to generate anions and cations, can not absorb negatively charged clay particles through electrostatic action, reduces hydration expansion of the clay particles, and is high in strengthUnder salt conditions, the clay particles cannot be inhibited from hydration swelling, so that the pH stabilizing effect under high salt conditions is limited.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a PH stabilizer for drilling fluid and an application method thereof. The invention can be applied to deep wells with ultra-deep well temperature of more than 180 ℃, large-section salt paste layers and high CO2 acid gas-containing stratum, has the capabilities of resisting temperature, salt and acid gas pollution, can avoid corrosion of drilling fluid by salt, and can effectively maintain the pH value of the drilling fluid at high temperature.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the PH stabilizer for the drilling fluid is characterized by comprising the following components in parts by mass: 8-12 parts of methyl alcohol amine, 2-4 parts of polydimethyl dienyl ammonium chloride, 2-4 parts of ammonia water, 1-3 parts of sodium carbonate, 1-3 parts of sodium bicarbonate, 3-5 parts of ammonium sulfate and 2-5 parts of deoxidizer.
The methyl alcohol amine is methyl monoethanolamine, methyl diethanolamine or dimethyl ethanolamine.
The concentration of the ammonia water is 0.05-0.1 mol/L.
The deoxidizer is sodium sulfite.
The PH stabilizer for the drilling fluid comprises the following components in parts by mass: 10 parts of methyldiethanolamine, 3 parts of polydimethyl dienyl ammonium chloride, 3 parts of ammonia water with the concentration of 0.1mol/L, 2 parts of sodium carbonate, 2 parts of sodium bicarbonate, 4 parts of ammonium sulfate and 4 parts of sodium sulfite.
The PH stabilizer for the drilling fluid comprises the following components in parts by mass: 8 parts of dimethylethanolamine, 4 parts of polydimethyl dienyl ammonium chloride, 4 parts of ammonia water with the concentration of 0.05mol/L, 1 part of sodium carbonate, 3 parts of sodium bicarbonate, 3 parts of ammonium sulfate and 5 parts of sodium sulfite.
The PH stabilizer for the drilling fluid comprises the following components in parts by mass: 12 parts of methyl monoethanolamine, 2 parts of polydimethyl dienyl ammonium chloride, 2 parts of ammonia water with the concentration of 0.1mol/L, 3 parts of sodium carbonate, 1 part of sodium bicarbonate, 5 parts of ammonium sulfate and 2 parts of sodium sulfite.
The application method of the PH stabilizer for the drilling fluid is characterized by comprising the following steps: mixing the pH stabilizer and the drilling fluid according to the mass ratio of 1:45-50, and then injecting the mixture into a drilled hole for drilling; when the pH stabilizer is mixed with the drilling fluid, the mixing method comprises the following steps:
s1: adding ammonia water, sodium carbonate and sodium bicarbonate in the pH stabilizer into the drilling fluid, stirring for 10-20 min, then adding methyl alcohol amine and ammonium sulfate, and continuing stirring for 5-15 min;
s2: and (2) adding polydimethyl dienyl ammonium chloride and an oxygen scavenger into the mixture obtained in the step (S1), stirring for 5min, and injecting into a drilling hole for drilling.
The invention has the advantages that:
1. the pH stabilizer comprises components such as methyl alcohol amine, polydimethyl dienyl ammonium chloride, ammonia water, sodium carbonate, sodium bicarbonate, ammonium sulfate, an deoxidizer and the like. The methyl alcohol amine can remove sulfur-containing impurities in the drilling process and can absorb acid gas, so that the sulfur-containing impurities and the acid gas can be prevented from being dissolved into the drilling fluid to reduce the pH value of the drilling fluid, and the pH value of the drilling fluid in the drilling process can be well maintained; in addition, the methyl alcohol amine can also play a role of an emulsifier, so that each component in the pH stabilizer can be well dispersed in the drilling fluid, and the pH stabilizing effect is better. Polydimethyl dienyl ammonium chloride (DMDAAC) is a cationic polymer that can adsorb negatively charged clay particles by electrostatic action, reducing the hydration swelling of the clay particles; in addition, the DMDAAC has good temperature resistance and salt resistance, can avoid the corrosion of the drilling fluid by salt, and can effectively maintain the pH value of the drilling fluid at high temperature. After the ammonia water is dissolved in the drilling fluid, the alkalinity of the drilling fluid can be increased, the ammonia water can be subjected to neutralization reaction with an acidic medium, the acidic medium is consumed, the interference of the acidic medium on the drilling fluid is reduced, and the pH of the drilling fluid is kept stable. Sodium carbonate and sodium bicarbonate form a buffer system that sustainably releases alkaline materials to maintain the pH of the drilling fluid. Ammonium sulfate introduces ammonium ions into the drilling fluid, and plays a role of a regulator, so that the coordination relation among components in the pH stabilizer can be coordinated, and the pH stabilizer can play a better role. The deoxidizer can remove oxides in the drilling process, and can avoid corrosion of the drilling tool caused by the oxides.
2. The pH stabilizer provided by the invention can well maintain the pH value of the solution. In particular, when the oil field is drilled, after the oil field is added into the drilling fluid, the pH value of the drilling fluid in the drilling process can be maintained, and the drilling efficiency is not affected.
3. Aiming at deep wells with ultra-deep well temperature of more than 180 ℃ and large-section salt paste layers and high-CO 2 acid gas-containing stratum, the invention introduces polydimethyl dienyl ammonium chloride, sodium carbonate, sodium bicarbonate and ammonium sulfate on the basis of the prior art to further improve the temperature resistance, salt resistance and acid gas pollution resistance of the pH stabilizer.
Detailed Description
The pH value of the drilling fluid can be reduced under the conditions of high temperature and high salt content, and the pH value can be continuously reduced along with the extension of time, so that the normal drilling is affected. The invention provides a pH stabilizer and application thereof, which are used for solving the problem that the pH of drilling fluid gradually decreases in the drilling process.
The following describes the present invention in detail with reference to examples.
Example 1
The PH stabilizer for the drilling fluid comprises the following components in parts by mass:
10 parts of methyldiethanolamine, 3 parts of polydimethyl dienyl ammonium chloride, 3 parts of ammonia water with the concentration of 0.1mol/L, 2 parts of sodium carbonate, 2 parts of sodium bicarbonate, 4 parts of ammonium sulfate and 4 parts of sodium sulfite.
The application method of the PH stabilizer for the drilling fluid comprises the steps of mixing the PH stabilizer with the drilling fluid according to the mass ratio of 1:45, and then injecting the mixture into a drilled hole for drilling; when the pH stabilizer is mixed with the drilling fluid, the mixing method comprises the following steps:
s1: adding ammonia water, sodium carbonate and sodium bicarbonate in the pH stabilizer into the drilling fluid, stirring for 10min, then adding methyl alcohol amine and ammonium sulfate, and continuing stirring for 5min;
s2: and (2) adding polydimethyl dienyl ammonium chloride and an oxygen scavenger into the mixture obtained in the step (S1), stirring for 5min, and injecting into a drilling hole for drilling.
Example 2
The PH stabilizer for the drilling fluid comprises the following components in parts by mass:
8 parts of dimethylethanolamine, 4 parts of polydimethyl dienyl ammonium chloride, 4 parts of ammonia water with the concentration of 0.05mol/L, 1 part of sodium carbonate, 3 parts of sodium bicarbonate, 3 parts of ammonium sulfate and 5 parts of sodium sulfite.
The application method of the PH stabilizer for the drilling fluid comprises the steps of mixing the PH stabilizer with the drilling fluid according to the mass ratio of 1:50, and then injecting the mixture into a drilled hole for drilling; when the pH stabilizer is mixed with the drilling fluid, the mixing method comprises the following steps:
s1: adding ammonia water, sodium carbonate and sodium bicarbonate in the pH stabilizer into the drilling fluid, stirring for 20min, then adding methyl alcohol amine and ammonium sulfate, and continuing stirring for 15min;
s2: and (2) adding polydimethyl dienyl ammonium chloride and an oxygen scavenger into the mixture obtained in the step (S1), stirring for 5min, and injecting into a drilling hole for drilling.
Example 3
The PH stabilizer for the drilling fluid comprises the following components in parts by mass:
12 parts of methyl monoethanolamine, 2 parts of polydimethyl dienyl ammonium chloride, 2 parts of ammonia water with the concentration of 0.1mol/L, 3 parts of sodium carbonate, 1 part of sodium bicarbonate, 5 parts of ammonium sulfate and 2 parts of sodium sulfite.
Comparative example 1
The pH stabilizer consists of the following components in parts by mass:
10 parts of methyl diethanolamine, 3 parts of ammonium chloride, 3 parts of ammonia water with the concentration of 0.1mol/L, 2 parts of sodium carbonate, 2 parts of sodium bicarbonate, 4 parts of ammonium sulfate and 4 parts of sodium sulfite.
Comparative example 2
The pH stabilizer consists of the following components in parts by mass:
10 parts of methyldiethanolamine, 3 parts of polydimethyldienyl ammonium chloride, 3 parts of ammonia water with the concentration of 0.1mol/L, 4 parts of ammonium sulfate and 4 parts of sodium sulfite.
Comparative example 3
The pH stabilizer consists of the following components in parts by mass:
10 parts of methyldiethanolamine, 3 parts of polydimethyldienyl ammonium chloride, 3 parts of ammonia water with the concentration of 0.1mol/L, 2 parts of sodium carbonate, 2 parts of sodium bicarbonate and 4 parts of ammonium sulfate.
Experimental example
The effect of the pH stabilizer was examined by the following method.
1. Preparing base slurry
Preparing a plurality of parts of base slurry. The preparation method of the base slurry comprises the following steps: taking 350mL of distilled water in a sample cup, adding 14g of bentonite for drilling fluid test slurry preparation and 0.49g of sodium carbonate, stirring at a high speed for 20min, scraping off a sample adhered to the wall of the cup at least twice, and hermetically curing for 16h at 25 ℃ under the temperature of 1 ℃.
2. Stabilization experiments
(1) To one portion of the base slurry, 30mL of HCl solution was added and stirring was performed at high speed for 5min, during which time the slurry adhering to the wall of the cup was scraped off twice to obtain an experimental base slurry.
The pH stabilizers in examples 1 to 3 were added to the base slurry, respectively, and stirred to obtain experimental sample slurries. The mass ratio of the added pH stabilizer to the base slurry is about 1:50, and the addition mode is as follows:
s1: adding ammonia water, sodium carbonate and sodium bicarbonate in the pH stabilizer into the drilling fluid, stirring for 10-20 min, then adding methyl alcohol amine and ammonium sulfate, and continuing stirring for 5-15 min;
s2: and (3) adding polydimethyl dienyl ammonium chloride and an deoxidizer into the mixture obtained in the step (S1), and continuously stirring for 5 minutes to obtain the modified polydimethyl dienyl ammonium chloride.
The leakage amounts of the base stock, the experimental base stock and the three experimental sample slurries were respectively tested according to the specification of 7.2 in GB/T16783.1-2014, and the filtrate was collected with a clean beaker (if the filtrate volume was less than 30mL, the measurement could be repeated a plurality of times until the filtrate volume reached 30 mL). The pH stability was calculated according to formulas (I), (II) and (III) using pH values of the base stock, the experimental base stock and the three experimental sample slurries, respectively.
Wherein: k is the pH value stabilization rate; k1 is the pH value reduction rate of the experimental base slurry; k2 is the pH value reduction rate of the experimental sample slurry; f1 is the pH value of the base slurry; f2 is the pH value of the experimental base slurry; f3 is the pH value of the experimental sample slurry.
(2) The pH stabilizers in comparative examples 1 to 3 were added to the base slurry, respectively, and stirred to obtain a comparative sample slurry. The leakage amounts of the base stock, the experimental base stock and the three comparative sample stocks were respectively tested as specified by 7.2 in GB/T16783.1-2014, and the filtrate was collected in a clean beaker (if the filtrate volume was less than 30mL, the measurement was repeated a plurality of times until the filtrate volume reached 30 mL). The pH stability was calculated according to formulas (I), (IV) and (V) using pH values of the base stock, the experimental base stock and the three comparative sample slurries, respectively.
Wherein: k3 is the pH value reduction rate of the comparative sample slurry; f4 is the pH of the comparative slurry.
3. Analysis of results
3.1 Comparison of ph stability after aging at 120℃for 16h
The pH stability rates measured after aging at 120℃for 16 hours after adding the pH stabilizers in examples and comparative examples are shown in Table 1.
Table 1 pH value stability rate
| Experimental group | pH stability rate/% |
| Example 1 | 95.23 |
| Example 2 | 94.91 |
| Example 3 | 95.02 |
| Comparative example 1 | 87.65 |
| Comparative example 2 | 82.13 |
| Comparative example 3 | 89.23 |
As can be seen from Table 1, the pH stabilizer of the invention can better maintain the pH value of the drilling fluid, has good pH stability and keeps the drilling efficiency at a higher level.
Comparative example 1 the polydimethyl dienyl ammonium chloride in the component was replaced with ammonium chloride, and the salt resistance and high temperature resistance of the obtained pH stabilizer were lowered, and the maintenance effect on pH was deteriorated, as compared with example 1.
Comparative example 2 compared with example 1, the composition lacks a sodium carbonate-sodium bicarbonate buffer system, the resulting pH stabilizer does not continuously release alkaline substances, the pH stability is poor, and the pH of the drilling fluid cannot be maintained for a long period of time.
Comparative example 3, compared to example 1, lacks an oxygen scavenger in the composition, is not effective in removing the oxidizing species present in the drilling fluid, and has poor pH stability.
3.2 temperature resistance comparative experiments
The pH stability rates measured after aging for 16 hours at different temperatures after adding the pH stabilizers of the examples and comparative examples are shown in Table 2.
TABLE 2 pH stability after aging at different temperatures
As can be seen from Table 2, the pH stabilizer of the invention can still maintain the pH value of the drilling fluid well after being thermally rolled for 16 hours at the temperature of less than 180 ℃, has good pH stability and keeps the drilling efficiency at a higher level.
Comparative example 1 in comparison with example 1, the polydimethyl dienyl ammonium chloride in the component was replaced with ammonium chloride, and the obtained pH stabilizing agent had a pH stabilizing rate of only 56.24% after aging at 180℃and a poor pH maintaining effect.
Comparative example 2 compared with example 1, the composition lacks a sodium carbonate-sodium bicarbonate buffer system, and the pH stabilizing rate of the obtained pH stabilizing agent after aging at 180 ℃ is only 52.66%, and the pH maintaining effect is poor.
Comparative example 3 compared with example 1, the absence of oxygen scavenger in the composition resulted in a pH stabilizing agent having a pH stabilizing rate of only 58.67% after aging at 180℃and a poor pH maintaining effect.
3.3 salt resistance control experiments
The measured pH stability after adding the pH stabilizers of examples and comparative examples at different salt concentrations is shown in Table 2.
TABLE 3 pH stability at various salt concentrations
As can be seen from Table 3, the pH stabilizer of the invention can still maintain the pH value of the drilling fluid well at a salt concentration of 30%, has good high-salt pH stability, and keeps the drilling efficiency at a higher level.
Comparative example 1 in comparison with example 1, the substitution of polydimethyl dienyl ammonium chloride in the component with ammonium chloride resulted in a pH stabilizing agent having a pH stabilizing rate of only 42.23% at 30% salt concentration and poor maintenance of pH at high salt conditions.
Comparative example 2 compared with example 1, the sodium carbonate-sodium bicarbonate buffer system was absent from the components, and the resulting pH stabilizer had a pH stabilization rate of only 40.16% at 30% salt concentration, and had poor pH maintenance under high salt conditions.
Comparative example 3 compared to example 1, the absence of oxygen scavenger in the composition resulted in a pH stabilizer having a pH stabilization rate of only 43.22% at 30% salt concentration and poor maintenance of pH at high salt conditions.
The application method of the PH stabilizer for the drilling fluid comprises the steps of mixing the PH stabilizer with the drilling fluid according to the mass ratio of 1:47, and then injecting the mixture into a drilled hole for drilling; when the pH stabilizer is mixed with the drilling fluid, the mixing method comprises the following steps:
s1: adding ammonia water, sodium carbonate and sodium bicarbonate in the pH stabilizer into the drilling fluid, stirring for 15min, then adding methyl alcohol amine and ammonium sulfate, and continuing stirring for 10min;
s2: and (2) adding polydimethyl dienyl ammonium chloride and an oxygen scavenger into the mixture obtained in the step (S1), stirring for 5min, and injecting into a drilling hole for drilling.
Claims (5)
1. The pH stabilizer for the drilling fluid is characterized by comprising the following components in parts by mass: 8-12 parts of methyl alcohol amine, 2-4 parts of polydimethyl diallyl ammonium chloride, 2-4 parts of ammonia water, 1-3 parts of sodium carbonate, 1-3 parts of sodium bicarbonate, 3-5 parts of ammonium sulfate and 2-5 parts of an oxygen scavenger; the methyl alcohol amine is methyl monoethanolamine, methyl diethanolamine or dimethyl ethanolamine; the concentration of the ammonia water is 0.05-0.1 mol/L; the deoxidizer is sodium sulfite.
2. The pH stabilizer for drilling fluid according to claim 1, wherein: the pH stabilizer for the drilling fluid consists of the following components in parts by mass: 10 parts of methyldiethanolamine, 3 parts of polydimethyldiallyl ammonium chloride, 3 parts of ammonia water with the concentration of 0.1mol/L, 2 parts of sodium carbonate, 2 parts of sodium bicarbonate, 4 parts of ammonium sulfate and 4 parts of sodium sulfite.
3. The pH stabilizer for drilling fluid according to claim 2, wherein: the pH stabilizer for the drilling fluid consists of the following components in parts by mass: 8 parts of dimethylethanolamine, 4 parts of polydimethyldiallyl ammonium chloride, 4 parts of ammonia water with the concentration of 0.05mol/L, 1 part of sodium carbonate, 3 parts of sodium bicarbonate, 3 parts of ammonium sulfate and 5 parts of sodium sulfite.
4. A pH stabilizer for drilling fluids according to claim 3, characterized in that: the pH stabilizer for the drilling fluid consists of the following components in parts by mass: 12 parts of methyl monoethanolamine, 2 parts of polydimethyl diallyl ammonium chloride, 2 parts of ammonia water with the concentration of 0.1mol/L, 3 parts of sodium carbonate, 1 part of sodium bicarbonate, 5 parts of ammonium sulfate and 2 parts of sodium sulfite.
5. The method for using the pH stabilizer for drilling fluid according to claim 1, wherein: mixing the pH stabilizer and the drilling fluid according to the mass ratio of 1:45-50, and then injecting the mixture into a drilled hole for drilling; when the pH stabilizer is mixed with the drilling fluid, the mixing method comprises the following steps:
s1: adding ammonia water, sodium carbonate and sodium bicarbonate in the pH stabilizer into the drilling fluid, stirring for 10-20 min, then adding methyl alcohol amine and ammonium sulfate, and continuing stirring for 5-15 min;
s2: and (2) adding polydimethyl diallyl ammonium chloride and an deoxidizer into the mixture obtained in the step (S1), stirring for 5min, and injecting into a drilling hole for drilling.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD233582A1 (en) * | 1984-12-29 | 1986-03-05 | Gommern Erdoel Erdgas | SUPPLEMENT FOR DRILLING PIPES FOR THE RESTORATION OF OXYGEN GAS DRILLING |
| CN103194189A (en) * | 2013-04-11 | 2013-07-10 | 中国石油大学(华东) | Drilling fluid capable of protecting coal bed methane reservoir |
| CN104404525A (en) * | 2014-11-14 | 2015-03-11 | 中国海洋石油总公司 | Method and special-purpose preparation for preventing oil gas pipeline and equipment from being corroded |
| CN109135689A (en) * | 2018-10-19 | 2019-01-04 | 中国石油集团渤海钻探工程有限公司 | Completion fluid pH buffer and preparation method thereof |
| CN109652034A (en) * | 2018-12-18 | 2019-04-19 | 中国石油集团川庆钻探工程有限公司 | A method of maintaining water-base drilling fluid pH value under the conditions of high temperature and high saliferous |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7842651B2 (en) * | 2007-12-18 | 2010-11-30 | Chengdu Cationic Chemistry Company, Inc. | Silicate drilling fluid composition containing lubricating agents and uses thereof |
-
2021
- 2021-05-31 CN CN202110599403.2A patent/CN115477930B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD233582A1 (en) * | 1984-12-29 | 1986-03-05 | Gommern Erdoel Erdgas | SUPPLEMENT FOR DRILLING PIPES FOR THE RESTORATION OF OXYGEN GAS DRILLING |
| CN103194189A (en) * | 2013-04-11 | 2013-07-10 | 中国石油大学(华东) | Drilling fluid capable of protecting coal bed methane reservoir |
| CN104404525A (en) * | 2014-11-14 | 2015-03-11 | 中国海洋石油总公司 | Method and special-purpose preparation for preventing oil gas pipeline and equipment from being corroded |
| CN109135689A (en) * | 2018-10-19 | 2019-01-04 | 中国石油集团渤海钻探工程有限公司 | Completion fluid pH buffer and preparation method thereof |
| CN109652034A (en) * | 2018-12-18 | 2019-04-19 | 中国石油集团川庆钻探工程有限公司 | A method of maintaining water-base drilling fluid pH value under the conditions of high temperature and high saliferous |
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