CN104877649A - Modified starch fluid loss additive for drilling fluids and preparation method thereof - Google Patents
Modified starch fluid loss additive for drilling fluids and preparation method thereof Download PDFInfo
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- CN104877649A CN104877649A CN201510236210.5A CN201510236210A CN104877649A CN 104877649 A CN104877649 A CN 104877649A CN 201510236210 A CN201510236210 A CN 201510236210A CN 104877649 A CN104877649 A CN 104877649A
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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
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
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Abstract
The invention particularly provides a modified starch fluid loss additive for drilling fluids, which is composed of the following components in percentage by weight: 60-80% of natural starch, 3-4% of bromoacetic acid, 5-15% of industrial alcohol, 2-7% of sodium hydroxide, 0.1-0.5% of diethylenetriamine, 0.5-1.0% of glacial acetic acid and the balance of water. The modified starch fluid loss additive for drilling fluids has the advantages of favorable water solubility, favorable compatibility and no biological toxicity, effectively lowers the fluid loss of the drilling fluid, is biodegradable, belongs to an environment-friendly product, satisfies the requirements of safe well drilling, productive formation protection, environment protection and the like for the fluid loss additive for drilling fluids in the oilfield large-scale development process, has the characteristics of low raw material cost, simple preparation method and simple required equipment and conditions, and is easy to implement.
Description
Technical field
The present invention relates to a kind of water-base drilling fluid fluid loss agent and preparation method thereof, be specifically related to a kind of drilling fluid treated starch fluid loss agent and preparation method thereof.
Background technology
Along with the continuous increase of China's grain yield, native starch abundance, low price, for research and development low cost, eco-friendly fluid loss additive for boring fluid provide effective, a brand-new approach.Both at home and abroad treated starch is used for additive for drilling fluid to have carried out large quantity research, particularly treated starch and be used for fluid loss agent and carry stick obtaining incremental advances, also in different oil-gas field probing, achieves a large amount of achievement.Dehydration falls in bibliographical information treated starch, anti sloughing effectiveness is good, in addition its outstanding saline-alkaline tolerance, be acknowledged as the high-quality water retaining of salt solution and saturated salt-water drilling fluid, and progressively becoming one of main treatment agent kind of drilling fluid, the research and development about drilling fluid treated starch have caused the great attention of more and more well borer author.
In Ordos Basin Changqing oilfields conventional well, prospect pit drilling process; the fluid loss additive for boring fluid of current use is various in style; such as sulfonated gilsonite class, resol class, humic acids etc.; due to starting material choose, the reason such as production and processing technology causes the finished product all in various degree containing to environment, the poisonous and hazardous material of health of human body; and quality is unstable again; add and pursue market juice, some product comprehensive quality wherein more effectively can not meet the demand of safety drilling, protection reservoir, protection of the environment.
Changqing oilfields oil gas equivalent realizes the ambitious goal of 5,000 ten thousand tons/year in recent years, in order to (hypotonic " three is low ", low pressure, low abundance) oil-gas field, even under the overall background of ultra-low penetration type, to realize stable yields volume increase at some block, horizontal well scale (particularly horizontal well, ultra-long horizontal well, gas storage well etc.) also constantly expand, horizontal section also constantly lengthens extension, add new two methods (new Law on Environmental Protection, new safe production act) brute force implement, to the guard ring guaranteed cost of drilling and completing fluids, protection reservoir function proposes high requirement, the consumption of fluid loss additive for boring fluid is increased severely, make with natural polymer starting material research environment-protecting asepsis, biodegradable, the wellbore liquid leaching loss agent of protection payzone particularly seems urgent.
Summary of the invention
The object of this invention is to provide a kind of drilling fluid treated starch fluid loss agent and preparation method thereof and meet field scale performance history safety drilling, protection payzone, protection of the environment etc. to the requirement of filtrate reducer for drilling fluid.
Technical scheme of the present invention there is provided a kind of drilling fluid treated starch fluid loss agent, be made up of the component of following weight percent: the native starch of 60% ~ 80%, the bromoacetic acid of 3% ~ 4%, the industrial spirit of 5% ~ 15%, the sodium hydroxide of 2% ~ 7%, the diethylenetriamine of 0.1% ~ 0.5%, the Glacial acetic acid of 0.5% ~ 1.0%, residual content is water.
Above-mentioned bromoacetic acid weight is 5.0% of native starch weight.
Preferably, drilling fluid treated starch fluid loss agent is made up of the component of following weight percent: the native starch of 80%, the bromoacetic acid of 4%, the industrial spirit of 8%, the sodium hydroxide of 3%, the diethylenetriamine of 0.5%, the Glacial acetic acid of 0.5%, the water of 4%.
In addition, present invention also offers a kind of preparation method of drilling fluid treated starch fluid loss agent, comprise the steps:
1) in closed reactor, first add the native starch that weight percent is 60% ~ 80%, pass into pure nitrogen gas and start after 10 minutes to stir.
2), when temperature of reaction kettle reaches 50 DEG C ~ 80 DEG C, stir and evenly add the bromoacetic acid of 3% ~ 4%, the industrial spirit formation starch milk of 5% ~ 15% successively.
3) to step 2) add the sodium hydroxide of 2% ~ 7%, the diethylenetriamine of 0.1% ~ 0.5% successively in the starch milk that formed, stirring reaction 60 minutes, stops heating.
4) to step 3) add in reacted component 0.5% ~ 1.0% Glacial acetic acid and water, its pH value is adjusted to 7 ~ 9, cooling, more cooled component is dried at 100 DEG C ~ 120 DEG C, pulverize, namely obtain drilling fluid treated starch fluid loss agent.
Above-mentioned steps 3) in add 0.1% ~ 0.5% the diethylenetriamine time used be 30 minutes.
Beneficial effect of the present invention:
(1) this drilling fluid treated starch fluid loss agent provided by the invention is water-soluble, compatibleness is good; effective reduction wellbore liquid leaching loss; lifeless matter toxicity, biodegradablely belong to environment-friendly type, meet field scale performance history safety drilling, protection payzone, protection of the environment etc. to the requirement of filtrate reducer for drilling fluid.
(2) this drilling fluid treated starch fluid loss agent provided by the invention take native starch as raw material; material cost is low; preparation method and required equipment condition simple; easy to implement; can to meet in mass-producing wellbore construction process wellbore liquid leaching loss agent requirement, significantly can reduce production cost again, simultaneously for research natural environmental-protective type drilling fluid and completion fluid provides technical support; economic benefit and social benefit well, have application value well.
Embodiment
Embodiment 1:
In order to meet field scale performance history safety drilling, protection payzone, protection of the environment etc. to the requirement of filtrate reducer for drilling fluid; present embodiments provide a kind of drilling fluid treated starch fluid loss agent; be made up of the component of following weight percent: the native starch of 60% ~ 80%; the bromoacetic acid of 3% ~ 4%; the industrial spirit of 5% ~ 15%, the sodium hydroxide of 2% ~ 7%, the diethylenetriamine of 0.1% ~ 0.5%; the Glacial acetic acid of 0.5% ~ 1.0%, residual content is water.
In addition, this invention drilling fluid preparation method of treated starch fluid loss agent, comprises the steps:
1) in closed reactor, first add the native starch that weight percent is 60% ~ 80%, pass into pure nitrogen gas and start after 10 minutes to stir.
2), when temperature of reaction kettle reaches 50 DEG C ~ 80 DEG C, stir and evenly add the bromoacetic acid of 3% ~ 4%, the industrial spirit formation starch milk of 5% ~ 15% successively.
3) to step 2) add the sodium hydroxide of 2% ~ 7%, the diethylenetriamine of 0.1% ~ 0.5% successively in the starch milk that formed, stirring reaction 60 minutes, stops heating.
4) to step 3) add in reacted component 0.5% ~ 1.0% Glacial acetic acid and water, its pH value is adjusted to 7 ~ 9, cooling, more cooled component is dried at 100 DEG C ~ 120 DEG C, pulverize, namely obtain drilling fluid treated starch fluid loss agent.
This drilling fluid treated starch fluid loss agent provided by the invention take native starch as raw material; material cost is low, and preparation method and required equipment condition are simply, easy to implement; can to meet in mass-producing wellbore construction process wellbore liquid leaching loss agent requirement, significantly can reduce production cost again.
Embodiment 2:
Present embodiments provide a kind of drilling fluid treated starch fluid loss agent, be made up of the component of following weight percent: the native starch of 80%, the bromoacetic acid of 4%, the industrial spirit of 8%, the sodium hydroxide of 3%, the diethylenetriamine of 0.5%, the Glacial acetic acid of 0.5%, the water of 4%; Described bromoacetic acid weight is 5.0% of native starch weight.
This invention drilling fluid preparation method of treated starch fluid loss agent, comprises the steps:
1) in closed reactor, first add the native starch that weight percent is 80%, pass into pure nitrogen gas and start after 10 minutes to stir.
2), when temperature of reaction kettle reaches 50 DEG C ~ 80 DEG C, stir and evenly add the bromoacetic acid of 4%, the industrial spirit formation starch milk of 8% successively.
3) to step 2) add the sodium hydroxide of 3%, the diethylenetriamine of 0.5% successively in the starch milk that formed, stirring reaction 60 minutes, stops heating, and adding the diethylenetriamine time used is 30 minutes.
4) to step 3) add the Glacial acetic acid of 0.5% and the water of 4% in reacted component, its pH value is adjusted to 7 ~ 9, cooling, more cooled component is dried at 100 DEG C ~ 120 DEG C, pulverize, namely obtain drilling fluid treated starch fluid loss agent.
The drilling fluid treated starch fluid loss agent obtained to the present embodiment is tested as follows:
(1) filtrate loss controllability measures:
Respectively with clear water, 4% bentonite slurry, No-Solid Phrase Polymer drilling fluid (clear water+0.3% polyacrylic acid potassium), low solids polymer drilling fluid (bentonite slurry+0.2% Polyanionic Cellulose sodium salt of 4%) prepares base slurry, the obtained drilling fluid treated starch fluid loss agent sample of the present embodiment is added according to different dosage in base slurry, test it to the impact of drilling fluid rheology and filtrate loss controllability, the results are shown in Table 1 ~ table 4, wherein, table 1 is the filtrate reducing testing data in clear water, table 2 is the filtrate reducing testing data in 4% bentonite slurry, table 3 is the filtrate reducing testing data in No-Solid Phrase Polymer, table 4 is the experimental data in low solids polymer drilling fluid.
Table 1:
Table 2:
Table 3:
Table 4:
As can be seen from table 1 ~ table 4, the drilling fluid treated starch fluid loss agent that the present embodiment obtains has and falls dehydration effect preferably and certain put forward sticky effect.
(2) the anti-calcium chloride of drilling fluid treated starch fluid loss agent, sodium-chlor pollutant performance are evaluated:
With 8% bentonite slurry preparation base slurry, the performance evaluation that the anti-calcium chloride of the drilling fluid treated starch fluid loss agent sample that test the present embodiment obtains, sodium-chlor pollute, the rheological property of test drilling fluid and high temperature and high pre ssure filtration, the results are shown in Table 5.
Table 5:
As can be seen from table 1 ~ table 5, the property indices such as filtrate loss controllability, antipollution of the drilling fluid treated starch fluid loss agent that the present embodiment obtains all meets onsite application requirement.
(3) the drilling fluid properties evaluation of treated starch fluid loss agent:
Test the performance of the drilling fluid treated starch fluid loss agent that the present embodiment obtains, result is as shown in table 6.
Table 6:
As shown in Table 6; the drilling fluid treated starch fluid loss agent that the present embodiment obtains is water-soluble, compatibleness is good; effective reduction wellbore liquid leaching loss; lifeless matter toxicity, biodegradablely belong to environment-friendly type, meet field scale performance history safety drilling, protection payzone, protection of the environment etc. to the requirement of filtrate reducer for drilling fluid.
Embodiment 3:
Present embodiments provide a kind of drilling fluid treated starch fluid loss agent, be made up of the component of following weight percent: the native starch of 60%, the bromoacetic acid of 3%, the industrial spirit of 15%, the sodium hydroxide of 2%, the diethylenetriamine of 0.1%, the Glacial acetic acid of 0.8%, the water of 19.1%.In closed reactor, first add the native starch that weight percent is 60%, pass into pure nitrogen gas and start after 10 minutes to stir; When temperature of reaction kettle reaches 50 DEG C ~ 80 DEG C, stir and slowly evenly add the bromoacetic acid of 3%, the industrial spirit formation starch milk of 15% successively; Then add the sodium hydroxide alkalization of 2%, then add the diethylenetriamine (adding for 30 minutes) of 0.1%, stirring reaction 60 minutes, stops heating; Finally, add the Glacial acetic acid of 0.8% and the water of 19.1%, its pH value is adjusted to 7 ~ 9, cooling, more cooled component is dried at 100 DEG C ~ 120 DEG C, pulverize, be i.e. obtained drilling fluid treated starch fluid loss agent.
Embodiment 4:
Present embodiments provide a kind of drilling fluid treated starch fluid loss agent, be made up of the component of following weight percent: the native starch of 70%, the bromoacetic acid of 3.5%, the industrial spirit of 5%, the sodium hydroxide of 7%, the diethylenetriamine of 0.3%, the Glacial acetic acid of 1.0%, the water of 13.2%.In closed reactor, first add the native starch that weight percent is 70%, pass into pure nitrogen gas and start after 10 minutes to stir; When temperature of reaction kettle reaches 50 DEG C ~ 80 DEG C, stir and slowly evenly add the bromoacetic acid of 3.5%, the industrial spirit formation starch milk of 5% successively; Then add the sodium hydroxide alkalization of 7%, then add the diethylenetriamine (adding for 30 minutes) of 0.3%, stirring reaction 60 minutes, stops heating; Finally, add the Glacial acetic acid of 1.0% and the water of 13.2%, its pH value is adjusted to 7 ~ 9, cooling, more cooled component is dried at 100 DEG C ~ 120 DEG C, pulverize, be i.e. obtained drilling fluid treated starch fluid loss agent.
The bright obtained fluid loss agent of performance test chart is carried out to embodiment 3 and the obtained drilling fluid treated starch fluid loss agent of embodiment 4 there is good filtrate reducing effect equally, be beneficial to very much in drilling process and keep hole stability, well rule, protection reservoir, protection of the environment.
Embodiment 5:
The present embodiment is by drilling fluid treated starch fluid loss agent test in place 24 mouthfuls of wells (flat 8-14H1 well in continent obtained for embodiment 2, quiet flat 50-06H4, quiet flat 50-06H3, quiet flat 50-06H1, quiet flat 50-06H2, Soviet Union 48-19-68H2 well, Soviet Union 14-2-37H1, well Soviet Union 14-2-37H2 well, peach 2-7-3H well, quiet flat 69-12H well, Soviet Union 48-18-42H2 well, peach 2-9-6H, two 8-34H2 well, quiet flat 68-9H, flat 31 wells of celebrating, flat 37 wells of celebrating, the flat 53-11 well in river, the flat 53-14 well in river, flat 22 wells of celebrating, flat 52 wells of celebrating, Zhenping 8-5 well, Chen Ping 22-7 well, flat 47 wells of celebrating, Chen Ping 18-8 well), on-the-spot maintenance dosage 0.5 ~ 3.0%, press fluid loss can control within 5.0ml in API, hmc is all in 0.3 millimeter, thin and tough and tensile mud cake can be formed, remarkable improvement of mud cake, effectively control drilling fluid filtrate and enter stratum, largely prevent the pulping of mudstone stratum, be beneficial to and maintain wellbore stability and prevent down-hole accident from occurring, prevent a large amount of filtrate from immersing payzone simultaneously and cause injury to reservoir, employing Luminous bacteria tests bio-toxicity simultaneously, EC50 is 163000mg/L, belongs to nontoxic scope (<20000mg/L) and has embodied good test effect.
Wherein, in the application of Soviet Union 14-2-37H2 well, after this well enters kick-off section, No-Solid Phrase Polymer drilling fluid system is not suitable for greatly the safe construction of lower well section due to dehydration, thus drilling fluid system has been changed into low solids polymer drilling fluid system, the drilling fluid treated starch fluid loss agent simultaneously adding embodiment 2 obtained controls dehydration, on-the-spot maintenance dosage 1% ~ 2.5%, filtrate reducing successful, within reaching 3.3ml, and significantly can improve filter cake quality, define thin and tough and tensile mud cake, largely prevent the pulping of mudstone stratum, maintain the respond well of wellbore stability, this well lower curved section total footage 752m, drilling period 15 days, 5 days are advanced by than design, speed-increasing effect is obvious.
At Chen Ping 18-8 well, due to formation water output, on-the-spot drilling fluid suffers severe contamination, drilling fluid rheology is deteriorated in half bean curd state, down-hole there occurs sticky card several times, need emergent management, otherwise the serious down-hole accident of generation is caused the financial loss being difficult to retrieve, the timely data collection of site operation group, analyze down-hole industrial and mineral, adopt the drilling fluid treated starch fluid loss agent that embodiment 2 is obtained, maintain dosage to 3%, within pressing fluid loss to reach 3.0ml in API, and improve mud cake quality, and then drilling fluid rheology have also been obtained strong improvement, the accident that avoids occurs, finally this well finishing drilling well depth 3390m, horizontal segment length 1000m, full well section average rate of penetration reaches 14.18m/h, create this block and surpass the full well section average rate of penetration tidemark of km horizontal section oil well horizontal well (Triassic system).
In sum; this drilling fluid treated starch fluid loss agent provided by the invention is water-soluble, compatibleness is good; effective reduction wellbore liquid leaching loss; lifeless matter toxicity, biodegradablely belong to environment-friendly type; meet field scale performance history safety drilling, protection payzone, protection of the environment etc. to the requirement of filtrate reducer for drilling fluid; the raw materials cost simultaneously adopted is low, preparation method and required equipment condition simple, easy to implement.
More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (5)
1. a drilling fluid treated starch fluid loss agent, it is characterized in that: be made up of the component of following weight percent: the native starch of 60% ~ 80%, the bromoacetic acid of 3% ~ 4%, the industrial spirit of 5% ~ 15%, the sodium hydroxide of 2% ~ 7%, the diethylenetriamine of 0.1% ~ 0.5%, the Glacial acetic acid of 0.5% ~ 1.0%, residual content is water.
2. drilling fluid treated starch fluid loss agent as claimed in claim 1, is characterized in that: described bromoacetic acid weight is 5.0% of native starch weight.
3. drilling fluid treated starch fluid loss agent as claimed in claim 1, it is characterized in that: be made up of the component of following weight percent: the native starch of 80%, the bromoacetic acid of 4%, the industrial spirit of 8%, the sodium hydroxide of 3%, the diethylenetriamine of 0.5%, the Glacial acetic acid of 0.5%, the water of 4%.
4., as the preparation method of treated starch fluid loss agent of the drilling fluid in claims 1 to 3 as described in any one, it is characterized in that: comprise the steps:
1) in closed reactor, first add the native starch that weight percent is 60% ~ 80%, pass into pure nitrogen gas and start after 10 minutes to stir;
2), when temperature of reaction kettle reaches 50 DEG C ~ 80 DEG C, stir and evenly add the bromoacetic acid of 3% ~ 4%, the industrial spirit formation starch milk of 5% ~ 15% successively;
3) to step 2) add the sodium hydroxide of 2% ~ 7%, the diethylenetriamine of 0.1% ~ 0.5% successively in the starch milk that formed, stirring reaction 60 minutes, stops heating;
4) to step 3) add in reacted component 0.5% ~ 1.0% Glacial acetic acid and water, its pH value is adjusted to 7 ~ 9, cooling, more cooled component is dried at 100 DEG C ~ 120 DEG C, pulverize, namely obtain drilling fluid treated starch fluid loss agent.
5. the drilling fluid preparation method of treated starch fluid loss agent as claimed in claim 4, is characterized in that: described step 3) in add 0.1% ~ 0.5% the diethylenetriamine time used be 30 minutes.
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| CN108410435A (en) * | 2018-03-12 | 2018-08-17 | 中国石油大学(华东) | A kind of drilling fluid nano-starch fluid loss additive and preparation method thereof |
| CN108715756A (en) * | 2018-07-20 | 2018-10-30 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of modified starch filtration-control additive and its preparation method and application |
| CN111040745A (en) * | 2019-11-28 | 2020-04-21 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Naturally-degradable environment-friendly drilling fluid |
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| CN111040745A (en) * | 2019-11-28 | 2020-04-21 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Naturally-degradable environment-friendly drilling fluid |
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