CN105987988A - Disperse system for evaluating drilling fluid, evaluating method and application - Google Patents
Disperse system for evaluating drilling fluid, evaluating method and application Download PDFInfo
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- CN105987988A CN105987988A CN201510092970.3A CN201510092970A CN105987988A CN 105987988 A CN105987988 A CN 105987988A CN 201510092970 A CN201510092970 A CN 201510092970A CN 105987988 A CN105987988 A CN 105987988A
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- modified starch
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Abstract
The invention discloses a disperse system for evaluating a filtrate reduction property of modified starch for a drilling fluid. The disperse system comprises water, sodium chloride with the content ranging from 25 w/v% to 35 w/v%, alkali metal hydroxide with the content ranging from 0.04 w/v% to 0.3 w/v% and evaluation soil with the content ranging from 10 w/v% to 12 w/v%, wherein the content takes the volume of water as a calculating standard. The invention further relates to an evaluation method and application thereof by means of the disperse system. According to the disperse system, an effective solid phase is adequate, CO3<2-> pollution is avoided, an influence of saturated salt particles on a water-loss reducing effect is avoided, and a disperse system which is stable and suitable for evaluating the filtrate reducer property of the modified starch for the drilling fluid and particularly a filtrate reducer property of high-temperature (e.g. 140 DEG C) resistant modified starch is formed. According to the disperse system, the test result is stable, repeatability is good, and the disperse system benefits objective evaluation on the filtrate reduction property of modified starch.
Description
Technical field
The invention belongs to drilling fluid in petroleum drilling engineering, particularly to a kind of appraisal drilling liquid modified starch
The dispersion of filtrate loss controllability.The invention still further relates to use the modified shallow lake of above-mentioned dispersion appraisal drilling liquid
The method of powder filtrate loss controllability and application thereof.
Background technology
Modified starch has the advantage of uniqueness as filtrate reducer for drilling fluid the lowest solid phase salt-water drilling fluid,
Its fall dehydration effect is good and viscosity increases few, the advantage that partially modified starch also has environmental protection and oil layer protection.
Along with deep prospecting gets more and more, bottom hole temperature (BHT) is more and more higher, how to find out accurate evaluation drilling fluid modification and forms sediment
Powder performance methodology is excellent for important to instruct the application of modified starch scene to show.The most conventional appraisal drilling liquid is with changing
The filtrate loss controllability method of property starch the most substantially has two classes.The first kind is to use external API starch standard to survey
Fixed its at room temperature adds 10% evaluation soil, 0.3%NaHCO in 4% saline or saturated brine3With 1% modified shallow lake
Powder measures its room temperature filtrate reducing amount, and this method testing can not carry out overall merit to it, as being difficult to evaluate
Its high temperature ageing performance, it is impossible to evaluate whether modified starch has high-temperature resistance.Equations of The Second Kind is to use employing one
0.3%Na is added after quantitative fresh water adds saturated salt2CO3, the sodium of 4% or calcium bentonite rear maintenance with slurry
Its normal pressure after aging 16 hours under 140 DEG C or a certain specified temp of 1% starch test is added after 24 hours
Filter loss, this method existing problems are will not aquation, effective solid phase in addition 4% sodium or calcium soil saturated brine
Dehydration effect, CO drop in the not enough starch that affects3 2-Can be to evaluating modified starch filtrate reducing effect as alkaline conditioner
Have an impact the salt grain unnecessary with in saturated brine and affect the filtrate loss controllability evaluation of modified starch inorganic agent.
Applicant of the present invention is by further investigation, it is provided that a kind of appraisal drilling liquid modified starch filtrate reducing
The dispersion of performance, not only efficiently against above-mentioned defect, and it is sufficient, without CO to have effective solid phase3 2-
Pollute, salt-free grain affects, it is possible to the fully filtrate loss controllability of evaluation modified starch, the most at high temperature
Filtrate loss controllability.
Summary of the invention
For deficiency of the prior art, the invention provides a kind of appraisal drilling liquid modified starch filtrate reducing
The dispersion of performance, it is possible to effectively evaluate the filtrate loss controllability of modified starch, the most at high temperature
Filtrate loss controllability.
According to an aspect of the invention, it is provided it is a kind of for appraisal drilling liquid modified starch filtration reduction
The dispersion of energy, including: water, content is the sodium chloride of 25-35w/v%, and content is 0.04-0.3w/v%
Alkali metal hydroxide, content be 10-12w/v% evaluation soil, wherein, described content body based on water
Amass as calculating benchmark.
The dispersion provided according to the present invention, effective solid phase is sufficient, without CO3 2-Pollute, salt-free grain affects,
Can fully evaluate the filtrate loss controllability of modified starch, filtrate loss controllability the most at high temperature.
A specific embodiment according to dispersion of the present invention, the content of described sodium chloride is
28-32w/v%, the content of alkali metal hydroxide is 0.1-0.2w/v%.Described w/v% refers to unit volume matter
Amount concentration.
According to another specific embodiment of dispersion of the present invention, described alkali metal hydroxide is selected from
At least one in sodium hydroxide and potassium hydroxide.
According to another specific embodiment of dispersion of the present invention, described evaluation soil is for meeting
The evaluation soil of SY5444-92 standard.Such as conventional Britain evaluates soil (Rev dust).
The dispersion provided according to the present invention, effective solid phase is sufficient, avoid CO3 2-Pollute, avoid saturated salt
The grain impact on fall dehydration effect, forms a set of stable applicable appraisal drilling liquid modified starch fluid loss additive
Can, the especially dispersion of high temperature resistance (such as 140 DEG C) modified starch fluid loss additive performance.According to the present invention
The dispersion provided, its test result is stable, reproducible, is conducive to the filtrate loss controllability to modified starch
Evaluate objectively.
According to another aspect of the present invention, it is provided that a kind of for appraisal drilling liquid modified starch filtrate reducing
The method of performance, comprises the steps:
1) preparation comprises the dispersion of following components: water, content is the sodium chloride of 25-35w/v%, and content is
The alkali metal hydroxide of 0.04-0.3w/v%, content is the evaluation soil of 10-12w/v%, wherein, described contains
Measure volume based on water for calculating benchmark；Then it is stirred
2) to step 1) in solution in add modified starch, be stirred, then carry out performance evaluation.
A specific embodiment according to the method for the invention, it is characterised in that the addition of described modified starch
Measure volume based on water and be calculated as 0.5～1.5w/v%, preferably 0.8～1.2w/v%.
According to another specific embodiment of method of the present invention, the content of described sodium chloride is
28-32w/v%, the content of alkali metal hydroxide is 0.1-0.2w/v%.
According to another specific embodiment of method of the present invention, described alkali metal hydroxide is selected from hydrogen-oxygen
Change at least one in sodium and potassium hydroxide.
According to another specific embodiment of method of the present invention, described evaluation soil is for meeting SY544-92
The evaluation soil of standard.
According to the present invention, described modified starch is the modified starch being used as fluid loss additive in this area, not only includes
Such as the high temperature resistance modified starch in CN201310432320.X, may also include other the fluid loss additive that can be used as
Modified starch.
The method provided according to the present invention, its test result is stable, reproducible, is conducive to modified starch
Filtrate loss controllability is evaluated objectively.The method provided according to the present invention, it is possible to effectively evaluate modified starch
Filtrate loss controllability, the especially filtrate loss controllability after high temperature ageing, thus the performance of modified starch is made comprehensive
Close and evaluate, provide convenient from the development of modified starch fluid loss additive, thus the progress of beneficially drilling engineering.
According to another aspect of the present invention, it is provided that a kind of above-mentioned dispersion or said method are led in drilling well
Application in territory, especially in the application in modified starch filtrate loss controllability of the appraisal drilling liquid.According to the present invention
Dispersion and evaluation methodology, for drilling applications, in particular for the modified starch fall filter of appraisal drilling liquid
Lose performance, it is possible to provide reference for the development of modified starch fluid loss additive, thus the progress of beneficially drilling engineering,
And then the exploitation of beneficially oil.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be further described, but be not intended that and appoint the present invention
What limits.
Method of testing: test with reference to SY/T5621-93 standard.
Comparative example 1
Take 350ml distilled water to pour height into and stir in cup, add sodium chloride and dissolve that to make its content be 30w/v%,
The NaHCO of 1.05g is added under the stir speed (S.S.) of 3000-5000rpm3After (feed time controls at 0.5min)
Stirring 3min；Add 35g Britain evaluate soil (Rev dust), (feed time controls at 1min) and
Stir 20min under 4000-6000rpm, obtain dispersion.Add in dispersion
(feed time controls high temperature resistance modified starch 3.5g in embodiment 1 in CN201310432320.X
Stir 20min 0.5min) and under 4000-6000rpm.It is evaluated after aging 16h at 140 DEG C.
Above-mentioned experiment uses three parallel sample to carry out parallel test.Data are shown in Table 1.
Comparative example 2
With comparative example 1, difference is, is added without above-mentioned modified starch.The number of three parallel tests
According to being shown in Table 1.
Table 1
From experimental result it can be seen that 3 parallel sample unstable results comparative example 1, it is impossible to preferably
Evaluate high temperature resistance modified starch filtrate reducing ability.
Comparative example 3
Take 350ml distilled water to pour height into and stir in cup, add sodium chloride and dissolve that to make its content be 40w/v%,
The NaHCO of 1.05g is added under the stir speed (S.S.) of 3000-5000rpm3After (feed time controls at 0.5min)
Stirring 3min；Add 35g Britain evaluate soil (Rev dust), (feed time controls at 1min) and
Stir 20min under 4000-6000rpm, obtain dispersion.201310432320.X is added in dispersion
Embodiment 1 in high temperature resistance modified starch 3.5g (feed time controls at 0.5min) and
20min is stirred under 4000-6000rpm.At 140 DEG C after aging 16h, it is evaluated.Above-mentioned experiment is adopted
Parallel test is carried out by three parallel sample.Data are shown in Table 2.
Comparative example 4
With comparative example 3, difference is, is added without above-mentioned modified starch.The number of three parallel tests
According to being shown in Table 2.
Table 2
From experimental result it can be seen that the evaluation result of comparative example 3 is bigger than normal, affect the testing result of product.
Meanwhile, domestic formula 1 can not preferably evaluate high temperature resistance modified starch filtrate reducing ability.
Comparative example 5
Take the distilled water of 350ml to pour height into and stir in cup, under the stir speed (S.S.) of 3000-5000rpm, add 0.7g
Na2CO3With the sodium soil of 14g, after stirring 30 minutes, room temperature maintenance 24h；3000-5000rpm's
Add NaCl (feed time controls at 0.5min, and the content of NaCl is 30w/v%) under stir speed (S.S.) to stir afterwards
3min, obtains dispersion.The high temperature resistance modified starch of 201310432320.X is added in dispersion
3.5g (feed time controls at 0.5min) also stirs 20min under 4000-6000rpm.At 140 DEG C
It is evaluated after aging 16h.Above-mentioned experiment uses three parallel sample to carry out parallel test.Data are shown in Table 3.
Comparative example 6
With comparative example 5, difference is, is added without above-mentioned modified starch.The number of three parallel tests
According to being shown in Table 3.
Table 3
From experimental result it can be seen that the evaluation result of comparative example 5 is bigger than normal, it is impossible to preferably embody the fall of product
Dehydration performance.Being primarily due in the formula of comparative example, the hydration capability of soil is deteriorated and soil amount deficiency causes filter
Vector is bigger than normal.
Embodiment 1
Take 350ml distilled water to pour height into and stir in cup, add sodium chloride and dissolve that to make its content be 30w/v%；?
Stir after adding the NaOH (feed time controls at 0.5min) of 0.7g under the stir speed (S.S.) of 3000-5000rpm
Mix 3min；Add 35g Britain evaluate soil (Rev dust), (feed time controls at 1min) and
Stir 20min under 4000-6000rpm, obtain dispersion.Add in dispersion
High temperature resistance modified starch 3.5g (feed time controls at 0.5min) of the embodiment 1 of CN201310432320.X
And under 4000-6000rpm, stir 20min.Wherein, the content of sodium hydroxide is 0.2w/v%, and Britain is commented
The content of valency soil is 10w/v%, and the content of modified starch is 1w/v%.At 140 DEG C, aging 16h is laggard
Row is evaluated.Above-mentioned experiment uses three parallel sample to carry out parallel test.Data are shown in Table.
Embodiment 2
With embodiment 1, difference is to be added without above-mentioned modified starch.The data of three parallel tests are shown in
Table.
Table 4
From experimental result it can be seen that the formula of this method can preferably evaluate the fall filter of high temperature resistance modified starch
Anergy power, the experimental result of gained is stable.
Embodiment 3:
With embodiment 1, difference is, the addition of NaOH is adjusted to 0.35g by 0.70g,.
Embodiment 4
With embodiment 1, difference is, the addition of NaOH is adjusted to 0.35g by 0.70g, described
The addition evaluating soil (Rev dust) is adjusted to 42g by 35g.
Embodiment 5
With embodiment 1, difference is that the addition of described modified starch is adjusted to 4.2g by 3.5g.
The evaluation result of embodiment 2-4 see table 5.
Table 5
From the above it is known that in accordance with the invention it is possible to preferably evaluate high temperature resistance modified starch
Filtrate reducing ability.
Embodiment 6
With embodiment 1, difference is to be replaced by above-mentioned modified starch the CMS-HT 1 of 3.5g.
Embodiment 7
With embodiment 1, difference is to be replaced by above-mentioned modified starch the CMS-HT 2 of 3.5g.
Embodiment 8
With embodiment 1, difference is to be replaced by above-mentioned modified starch the EXTRA-STAR of 3.5g.
The evaluation result of embodiment 6-8 see table 6.
Table 6
From experimental result it can be seen that can effectively distinguish the fall filter of product according to the dispersion of this method
Losing efficacy really, the method in the present invention can preferably evaluate high temperature resistance modified starch filtrate reducing ability.
By above-mentioned data it is known that (comparative example 1-6) of the prior art dispersion cannot be commented objectively
The filtrate loss controllability of valency modified starch, evaluation result is bigger than normal or poor stability, poor repeatability.And
The dispersion provided according to the present invention and the evaluation methodology utilizing described dispersion, it is possible to preferably evaluate
Filtrate loss controllability after the filtrate loss controllability of modified starch, especially high temperature (such as 140 DEG C) are aging, performance
Stable, reproducible；By evaluating, it is possible to distinguish the filtrate loss controllability of different modified starch..
It should be noted that, embodiment described above is only used for explaining the present invention, it is not intended that the present invention
Any restriction.By referring to exemplary embodiments, invention has been described, it should be appreciated that wherein institute
Word be descriptive and explanatory vocabulary rather than limited vocabulary.Can weigh in the present invention by regulation
The present invention is modified in the range of requiring by profit, and to this in without departing substantially from scope and spirit of the present invention
Invention is revised.Although the present invention described in it relates to specific method, material and embodiment, but
Being not meant to that the present invention is limited to wherein disclosed particular case, on the contrary, the present invention can be extended to other all tools
There are the methods and applications of identical function.
Claims (10)
1. for an appraisal drilling liquid dispersion for modified starch filtrate loss controllability, including: water, content
For the sodium chloride of 25-35w/v%, content is the alkali metal hydroxide of 0.04-0.3w/v%, and content is
The evaluation soil of 10-12w/v%, wherein, described content volume based on water is for calculating benchmark.
Dispersion the most according to claim 1, it is characterised in that the content of described sodium chloride is
28-32w/v%, the content of alkali metal hydroxide is 0.1-0.2w/v%.
Dispersion the most according to claim 1 and 2, it is characterised in that described alkali metal hydroxide
At least one in sodium hydroxide and potassium hydroxide.
4. according to the dispersion described in any one in claim 1-3, it is characterised in that described evaluation soil
For meeting the evaluation soil of SY5444-92 standard.
5. an appraisal drilling liquid method for modified starch filtrate loss controllability, comprises the steps:
1) preparation comprises the dispersion of following components: water, content is the sodium chloride of 25-35w/v%, and content is
The alkali metal hydroxide of 0.04-0.3w/v%, content is the evaluation soil of 10-12w/v%, wherein, described contains
Measure volume based on water for calculating benchmark；Then it is stirred
2) to step 1) in solution in add modified starch, be stirred, then carry out performance evaluation.
Method the most according to claim 5, it is characterised in that the addition of described modified starch is based on water
Volume be calculated as 0.5-1.5w/v%, preferably 0.8-1.2w/v%.
7. according to the method described in claim 5 or 6, it is characterised in that the content of described sodium chloride is
28-32w/v%, the content of alkali metal hydroxide is 0.1-0.2w/v%.
8. according to the method described in any one in claim 5-7, it is characterised in that described alkali metal hydrogen-oxygen
At least one in sodium hydroxide and potassium hydroxide of compound.
9. according to the method described in any one in claim 5-8, it is characterised in that described evaluation soil is symbol
Close the evaluation soil of SY5444-92 standard.
10. according to any one institute in dispersion described in any one in claim 1-4 or claim 5-9
The method of stating application in drilling applications, especially appraisal drilling liquid with in modified starch filtrate loss controllability should
With.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0758011A1 (en) * | 1995-08-08 | 1997-02-12 | Texas United Chemical Company, Llc. | Method of reducing fluid loss of well drilling and servicing fluids |
| EP0852235A2 (en) * | 1997-01-03 | 1998-07-08 | Chemstar Products Company | High temperature stable modified starch polymers and well drilling fluids employing same |
| US20050051363A1 (en) * | 2003-09-09 | 2005-03-10 | Trinidad Munoz | Treatment fluids comprising starch and ceramic particulate bridging agents and methods of using these fluids to provide fluid loss control |
| CN101787267A (en) * | 2010-03-17 | 2010-07-28 | 西南石油大学 | Double-modified starch fluid loss additive used for oil and gas field drilling fluid and preparation method thereof |
| CN102899005A (en) * | 2012-10-31 | 2013-01-30 | 中国石油大学(华东) | High temperature-resisting, anti-salt, anti-calcium filtrate reducer for drilling fluid and preparation method thereof |
| CN102898585A (en) * | 2011-07-26 | 2013-01-30 | 四川仁智油田技术服务股份有限公司 | Preparation method of high temperature resistant drilling fluid filtrate reducer |
| CN103483500A (en) * | 2013-09-29 | 2014-01-01 | 陕西师范大学 | High-temperature resistant and strong water-absorbing fluid loss additive and application thereof |
| US20140318788A1 (en) * | 2013-04-26 | 2014-10-30 | Halliburton Energy Services, Inc. | Viscosified breaker fluid compositions for extended delay in filtercake removal at high temperature |
| CN104327809A (en) * | 2014-11-03 | 2015-02-04 | 河北光大石化有限公司 | Fluid loss agent for drilling fluid and preparation method of fluid loss agent |
-
2015
- 2015-03-02 CN CN201510092970.3A patent/CN105987988A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0758011A1 (en) * | 1995-08-08 | 1997-02-12 | Texas United Chemical Company, Llc. | Method of reducing fluid loss of well drilling and servicing fluids |
| EP0852235A2 (en) * | 1997-01-03 | 1998-07-08 | Chemstar Products Company | High temperature stable modified starch polymers and well drilling fluids employing same |
| US20050051363A1 (en) * | 2003-09-09 | 2005-03-10 | Trinidad Munoz | Treatment fluids comprising starch and ceramic particulate bridging agents and methods of using these fluids to provide fluid loss control |
| CN101787267A (en) * | 2010-03-17 | 2010-07-28 | 西南石油大学 | Double-modified starch fluid loss additive used for oil and gas field drilling fluid and preparation method thereof |
| CN102898585A (en) * | 2011-07-26 | 2013-01-30 | 四川仁智油田技术服务股份有限公司 | Preparation method of high temperature resistant drilling fluid filtrate reducer |
| CN102899005A (en) * | 2012-10-31 | 2013-01-30 | 中国石油大学(华东) | High temperature-resisting, anti-salt, anti-calcium filtrate reducer for drilling fluid and preparation method thereof |
| US20140318788A1 (en) * | 2013-04-26 | 2014-10-30 | Halliburton Energy Services, Inc. | Viscosified breaker fluid compositions for extended delay in filtercake removal at high temperature |
| CN103483500A (en) * | 2013-09-29 | 2014-01-01 | 陕西师范大学 | High-temperature resistant and strong water-absorbing fluid loss additive and application thereof |
| CN104327809A (en) * | 2014-11-03 | 2015-02-04 | 河北光大石化有限公司 | Fluid loss agent for drilling fluid and preparation method of fluid loss agent |
Non-Patent Citations (4)
| Title |
|---|
| 史俊杰: "淀粉改性絮凝剂的制备及性能研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
| 田文欣: "复合变性淀粉合成与性能评价", 《化学工业与工程技术》 * |
| 陈馥等: "一种改性淀粉钻井液降滤失剂的合成与性能评价", 《应用化工》 * |
| 麻超等: "一种改性淀粉的合成及性能评价", 《石油化工应用》 * |
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