CN115477930A - 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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- CN115477930A CN115477930A CN202110599403.2A CN202110599403A CN115477930A CN 115477930 A CN115477930 A CN 115477930A CN 202110599403 A CN202110599403 A CN 202110599403A CN 115477930 A CN115477930 A CN 115477930A
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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 poly dimethyl diene 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 the ultra-deep well of the deep well with the temperature of more than 180 ℃, a large salt-gypsum layer and high CO content 2 The acid gas stratum has the capabilities of resisting temperature, salt and acid gas pollution, can prevent the drilling fluid from being corroded 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, due to the reasons of temperature rise, salt corrosion and the like, the pH value of the drilling fluid can be reduced, so that the effect of the treating agent in the drilling fluid is influenced to a certain extent, the working performance of the drilling fluid is reduced, the corrosion of a drilling tool is aggravated, drilling accidents are caused, and the drilling cost is increased. The pH value of the drilling fluid is reduced under the conditions of high temperature and high salt content, and the pH value is continuously reduced along with the prolonging of time; the pH value is reduced more quickly when the temperature is higher, the pH value is reduced more greatly when the salt content is higher, and the normal drilling is influenced.
The current solution is to supplement a large amount of caustic soda to the drilling fluid, maintain the pH of the drilling fluid and then adjust the performance of the drilling fluid. The existing mode of supplementing a large amount of caustic soda has high cost.
In addition, the invention discloses a method for maintaining the pH value of a water-based drilling fluid under the conditions of high temperature and high salt content in the publication No. CN109652034A and publication No. 2019-04-19, which is characterized in that on the basis of the existing water-based drilling fluid formula, 0.3-1.0 percent of pH stabilizer and 0.3-0.5 percent of deoxidant are added according to the mass percentage of the water-based drilling fluid formula, and the specific method is as follows: after the preparation of the water-based drilling fluid is finished, sequentially adding a pH stabilizer and a deoxidant; during the maintenance treatment, the two treating agents are added in proportion, wherein the oxygen scavenger is added last. The pH stabilizer is methyl monoethanolamine, methyl diethanolamine or dimethylethanolamine. The method can relieve the reduction range 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, and wells caused by treatment agent failure, drilling tool corrosion and the like due to the reduction of the pH value of the drilling fluid are preventedThe method is complex, and meanwhile, the condition that the pH value of the drilling fluid is maintained by means of a large amount of supplementary caustic soda under the conditions of high temperature and high salt content is reduced, so that the effects of cost reduction and efficiency improvement are achieved. But it has major problems in that: (1) The temperature resistance is limited, the degradation temperature of the PH stabilizer of the alcohol amine derivative is about 130 ℃, and for an ultra-deep well, the bottom temperature is often over 180 ℃, so that the current drilling requirement is not met; (2) CO resistance 2 The acid gas pollution capacity is limited, and the alcamines derivatives can remove sulfur-containing impurities in the drilling process but can also remove CO 2 Acid gas absorption capacity is limited for high CO content 2 Gas formations, with limited pH stabilizing effect; (3) The salt resistance is limited, the alcohol amine derivative pH stabilizer cannot be ionized to generate anions and cations, negatively charged clay particles cannot be adsorbed through electrostatic action, and hydration expansion of the clay particles is reduced, so that the hydration expansion of the clay particles cannot be inhibited under a high-salt condition, and the pH stabilizing effect under the high-salt condition is limited.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a pH stabilizer for drilling fluid and an application method thereof. The invention can be applied to the deep well and ultra-deep well with the temperature of more than 180 ℃, and a large salt-gypsum layer and a stratum with high CO2 content and acid gas, has the capabilities of resisting temperature, salt and acid gas pollution, can avoid the corrosion of the drilling fluid by salt, and can effectively maintain the pH value of the drilling fluid at high temperature.
In order to achieve the 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 poly dimethyl diene 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 deoxidant.
The methyl alcohol amine is methyl monoethanolamine, methyl diethanolamine or dimethylethanolamine.
The concentration of the ammonia water is 0.05-0.1 mol/L.
The deoxidant 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 poly-dimethyl-diene 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 poly (dimethyldiallylammonium 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 poly dimethyl diene 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.
An application method of a PH stabilizer for drilling fluid is characterized in that: mixing a pH stabilizer and the drilling fluid according to the mass ratio of 1 to 45-50, and then injecting the mixture into a drill hole to drill the hole; 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 adding poly dimethyl diene ammonium chloride and a deoxidant into the mixture obtained in the step S1, stirring for 5min, and injecting into a drill hole for drilling.
The invention has the advantages that:
1. the pH stabilizer comprises methyl alcohol amine, poly dimethyl diene ammonium chloride, ammonia water, sodium carbonate, sodium bicarbonate, ammonium sulfate, a deoxidant and the like. The methyl alcohol amine can remove sulfur-containing impurities in the drilling process, absorb acid gas, prevent the sulfur-containing impurities and the acid gas from being dissolved in the drilling fluid to reduce the pH value of the drilling fluid, and well maintain the pH value of the drilling fluid in the drilling process; moreover, 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. The polydimethyl diene ammonium chloride (DMDAAC) is a cationic polymer, and can adsorb negatively charged clay particles through electrostatic interaction to reduce the hydration expansion of the clay particles; in addition, the DMDAAC has good temperature resistance and salt resistance, can prevent the drilling fluid from being corroded by salt, and can effectively maintain the pH value of the drilling fluid at high temperature. After being dissolved in the drilling fluid, the ammonia water can increase the alkalinity of the drilling fluid, can generate a neutralization reaction with an acidic medium, consumes the acidic medium, reduces the interference of the acidic medium on the drilling fluid, and keeps the pH value of the drilling fluid stable. The sodium carbonate and the sodium bicarbonate form a buffer system and can continuously release alkaline substances so as to maintain the pH value of the drilling fluid. Ammonium sulfate introduces ammonium ions into the drilling fluid, which plays a role of a regulator and can coordinate the matching relationship among the components in the pH stabilizer, so that the pH stabilizer can exert a better effect. The deoxidant can remove oxides in the drilling process and can avoid the oxides from corroding drilling tools.
2. The pH stabilizer provided by the invention can well maintain the pH value of the solution. Particularly, when the drilling fluid is added into the drilling fluid in the drilling process of the oil field, the pH value of the drilling fluid in the drilling process can be maintained, and the drilling efficiency is not influenced.
3. The invention aims to introduce polydimethyl diene ammonium chloride, sodium carbonate, sodium bicarbonate and ammonium sulfate to further improve the temperature resistance, salt resistance and acid resistance gas pollution resistance of a pH stabilizer on the basis of the prior art aiming at the temperature of a deep well and an ultra-deep well which is higher than 180 ℃, a large salt-paste layer and a stratum with high CO2 content acid gas.
Detailed Description
The pH value of the drilling fluid is reduced under the conditions of high temperature and high salt content, and the pH value is continuously reduced along with the prolonging of time, so that the normal drilling is influenced. The invention provides a pH stabilizer and application thereof, which are used for solving the problem that the pH of a drilling fluid is gradually reduced in a drilling process.
The following examples are provided to illustrate specific embodiments of the present invention.
Example 1
A PH stabilizer for drilling fluid is composed of the following components in parts by mass:
10 parts of methyldiethanolamine, 3 parts of poly dimethyl diene 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.
An application method of a pH stabilizer for drilling fluid is characterized in that the pH stabilizer and the drilling fluid are mixed according to the mass ratio of 1; 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 adding poly dimethyl diene ammonium chloride and an oxygen scavenger into the mixture obtained in the step S1, stirring for 5min, and injecting into a drill hole for drilling.
Example 2
A PH stabilizer for drilling fluid is composed of the following components in parts by mass:
8 parts of dimethylethanolamine, 4 parts of poly (dimethyldiallylammonium 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.
An application method of a pH stabilizer for drilling fluid is characterized in that the pH stabilizer and the drilling fluid are mixed according to the mass ratio of 1; 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 adding poly dimethyl diene ammonium chloride and a deoxidant into the mixture obtained in the step S1, stirring for 5min, and injecting into a drill hole for drilling.
Example 3
A PH stabilizer for drilling fluid is composed of the following components in parts by mass:
12 parts of methyl monoethanolamine, 2 parts of poly dimethyl diene 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
A pH stabilizer comprises the following components in parts by mass:
10 parts of methyldiethanolamine, 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
A pH stabilizer comprises the following components in parts by mass:
10 parts of methyldiethanolamine, 3 parts of poly-dimethyl-diene 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
A pH stabilizer is composed of the following components in parts by mass:
10 parts of methyldiethanolamine, 3 parts of poly-dimethyl-diene 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.
Examples of the experiments
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: and (2) adding 350mL of distilled water into a sample cup, adding 14g of bentonite for preparing the slurry for the drilling fluid test and 0.49g of sodium carbonate, stirring at a high speed for 20min, at least interrupting twice during the stirring to scrape the sample adhered to the cup wall, and maintaining in a closed manner at the temperature of 25 ℃ and 1 ℃ for 16h to obtain the artificial tooth drilling fluid.
2. Stability test
(1) A portion of the stock was added to 30mL of HCl solution and stirred at high speed for 5min, during which time two breaks were made to scrape off the slurry adhering to the walls of the cup, to obtain the experimental stock.
The pH stabilizers of examples 1 to 3 were added to the base slurries, respectively, and stirred to obtain experimental slurries. The mass ratio of the added pH stabilizer to the base slurry is about 1, and the adding mode is as follows:
s1: adding ammonia water, sodium carbonate and sodium bicarbonate in a 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 the poly-dimethyl-diene ammonium chloride and the deoxidant into the mixture obtained in the step (S1), and continuously stirring for 5min to obtain the composite material.
The base pulp, the experimental base pulp and three experimental sample pulps are respectively tested for leakage according to the specification of 7.2 in GB/T16783.1-2014, and the filtrate is collected by a clean beaker (if the volume of the filtrate is less than 30mL, the volume of the filtrate can be repeatedly tested to reach 30mL for many times). The pH values of the base slurry, the experimental base slurry and the three experimental sample slurries were measured by pH meters, and the pH stabilization rate was calculated according to the formulas (I), (II) and (III).
In the formula: k is the pH value stability rate; k1 is the reduction rate of the pH value of the experimental base slurry; k2 is the reduction rate of the pH value 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 slurry.
(2) The pH stabilizers in comparative examples 1 to 3 were added to the base slurries, respectively, and stirred to obtain comparative sample slurries. The base slurry, experimental base slurry and three control slurries were tested for leakage as specified in 7.2 of GB/T16783.1-2014, and the filtrate was collected in a clean beaker (if the filtrate volume was less than 30mL, the filtrate volume was repeatedly measured to 30mL for several times). The pH values of the base slurry, the experimental base slurry and the three reference slurries were measured by a pH meter, and the pH stabilization rate was calculated according to the formulas (I), (IV) and (V).
In the formula: k3 is the reduction rate of the pH value of the comparison sample slurry; f4 is the pH of the comparative slurry.
3. Analysis of results
3.1 Comparison of the Ph stability after aging at 120 ℃ for 16h
The pH value stabilization rates measured after aging at 120 ℃ for 16 hours after adding the pH stabilizers of examples and comparative examples are shown in Table 1.
TABLE 1 pH value stabilization Rate
| Experimental group | pH value 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 present invention can maintain the pH value of the drilling fluid well, has good pH stability, and keeps the drilling efficiency at a high level.
Comparative example 1 compared with example 1, in which the ammonium chloride of the polydimethyl diene was replaced with ammonium chloride, the salt resistance and high temperature resistance of the resulting pH stabilizer were lowered, and the effect of maintaining pH was deteriorated.
Compared with the example 1, the components of the comparative example 2 lack a sodium carbonate-sodium bicarbonate buffer system, the obtained pH stabilizer cannot continuously release alkaline substances, the pH stability is poor, and the pH value of the drilling fluid cannot be maintained for a long time.
Compared with the embodiment 1, the comparative example 3 has the defects that the components lack the oxygen scavenger, the oxidizing substances existing in the drilling fluid can not be effectively removed, and the pH stability is poor.
3.2 temperature resistance comparative experiment
The pH stabilizing rates measured after aging for 16 hours at different temperatures after adding the pH stabilizers of examples and comparative examples are shown in Table 2.
TABLE 2 pH value stabilization rate after aging at different temperatures
As can be seen from Table 2, the pH stabilizer of the present invention can maintain the pH value of the drilling fluid well after being hot rolled for 16 hours at a temperature within 180 ℃, and has good pH stability performance, such that the drilling efficiency is maintained at a high level.
Comparative example 1 compared with example 1, the ammonium chloride was substituted for the ammonium chloride in the composition, and the pH stabilizing rate of the obtained pH stabilizer after aging at 180 ℃ was only 56.24%, and the pH maintaining effect was poor.
Comparative example 2 compared with example 1, the sodium carbonate-sodium bicarbonate buffer system is absent in the composition, the pH stabilizing rate of the obtained pH stabilizer after aging at 180 ℃ is only 52.66%, and the pH maintaining effect is poor.
Compared with the example 1, the components of the comparative example 3 lack the oxygen scavenger, the pH stabilizing rate of the obtained pH stabilizer after aging at 180 ℃ is only 58.67%, and the pH maintaining effect is poor.
3.3 comparative experiment on salt resistance
The pH value stabilizing rates measured after adding the pH stabilizers of examples and comparative examples at different salt concentrations are shown in Table 2.
TABLE 3 pH value stability at different salt concentrations
As can be seen from Table 3, the pH stabilizer of the present invention can maintain the pH of the drilling fluid well at 30% salt concentration, and has good high-salt pH stability, so as to maintain the drilling efficiency at a high level.
Comparative example 1 compared with example 1, the ammonium chloride was substituted for the ammonium chloride in the composition, and the pH stabilizer obtained had a pH stabilizing rate of only 42.23% at a salt concentration of 30%, and had poor pH maintaining effect under high salt conditions.
Comparative example 2 compared with example 1, the sodium carbonate-sodium bicarbonate buffer system is absent in the composition, the pH stabilizing rate of the obtained pH stabilizer is only 40.16% under 30% salt concentration, and the pH maintaining effect under high salt condition is poor.
Comparative example 3 compared with example 1, the oxygen scavenger is absent in the composition, the pH stabilizing rate of the obtained pH stabilizer is only 43.22% at 30% salt concentration, and the pH maintaining effect is poor under high salt condition.
An application method of a pH stabilizer for drilling fluid is characterized in that the pH stabilizer and the drilling fluid are mixed according to the mass ratio of 1; 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 a pH stabilizer into the drilling fluid, stirring for 15min, then adding methyl alcohol amine and ammonium sulfate, and continuing stirring for 10min;
s2: and adding poly dimethyl diene ammonium chloride and an oxygen scavenger into the mixture obtained in the step S1, stirring for 5min, and injecting into a drill hole for drilling.
Claims (8)
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 poly dimethyl diene 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.
2. The pH stabilizer for drilling fluid according to claim 1, which is characterized by comprising the following components in parts by mass: the methyl alcohol amine is methyl monoethanolamine, methyl diethanolamine or dimethylethanolamine.
3. The pH stabilizer for the drilling fluid as claimed in claim 2, which is characterized by comprising the following components in parts by mass: the concentration of the ammonia water is 0.05 to 0.1mol/L.
4. The pH stabilizer for drilling fluid according to claim 3, which is characterized by comprising the following components in parts by mass: the deoxidant is sodium sulfite.
5. The pH stabilizer for drilling fluid according to claim 4, which is characterized by comprising the following components in parts by mass: the PH stabilizer for the drilling fluid comprises the following components in parts by mass: 10 parts of methyldiethanolamine, 3 parts of poly-dimethyl-diene 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.
6. The pH stabilizer for drilling fluid according to claim 4, which is characterized by comprising the following components in parts by mass: the PH stabilizer for the drilling fluid comprises the following components in parts by mass: 8 parts of dimethylethanolamine, 4 parts of poly (dimethyldiallylammonium 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.
7. The pH stabilizer for drilling fluid according to claim 4, which is characterized by comprising the following components in parts by mass: the PH stabilizer for the drilling fluid comprises the following components in parts by mass: 12 parts of methyl monoethanolamine, 2 parts of poly dimethyl diene 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.
8. The method of using a PH stabilizer for drilling fluids according to claim 1, wherein: mixing a pH stabilizer and the drilling fluid according to the mass ratio of 1-45-50, and then injecting the mixture into a drill hole to drill the hole; 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 a pH stabilizer into the drilling fluid, stirring for 10 to 20min, then adding methyl alcohol amine and ammonium sulfate, and continuously stirring for 5 to 15min;
s2: and adding poly dimethyl diene ammonium chloride and a deoxidant into the mixture obtained in the step S1, stirring for 5min, and injecting into a drill hole for drilling.
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| DD233582A1 (en) * | 1984-12-29 | 1986-03-05 | Gommern Erdoel Erdgas | SUPPLEMENT FOR DRILLING PIPES FOR THE RESTORATION OF OXYGEN GAS DRILLING |
| US20090170730A1 (en) * | 2007-12-18 | 2009-07-02 | Anming Wu | Silicate drilling fluid composition containing lubricating agents and uses thereof |
| 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 |
-
2021
- 2021-05-31 CN CN202110599403.2A patent/CN115477930B/en active Active
Patent Citations (6)
| 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 |
| US20090170730A1 (en) * | 2007-12-18 | 2009-07-02 | Anming Wu | Silicate drilling fluid composition containing lubricating agents and uses thereof |
| 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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