CN102053045A - Evaluation method of oil-based drilling fluid wetting agent - Google Patents
Evaluation method of oil-based drilling fluid wetting agent Download PDFInfo
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- CN102053045A CN102053045A CN 201010521882 CN201010521882A CN102053045A CN 102053045 A CN102053045 A CN 102053045A CN 201010521882 CN201010521882 CN 201010521882 CN 201010521882 A CN201010521882 A CN 201010521882A CN 102053045 A CN102053045 A CN 102053045A
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Abstract
The invention discloses an evaluation method of an oil-based drilling fluid wetting agent. The method comprises the following steps: oil phase solution of the wetting agent with a predetermined concentration is prepared, and after the wetting agent is completely dissolved in the oil phase, a certain amount of Barite powder is added and enabled to be uniformly dispersed in the solution; and then the solution is placed in a baking oven with a certain temperature for thermostatic storage, volume of the settled Barite is measured after a predetermined period of time, the wettability strengths of different wetting agents in the same oil phase, or the wettability strengths of the same wetting agent in different oil phases, are judged according to the size of the settling volume, and the smaller the settling volume is, the stronger the wettability is, whereas, the wettability is weaker. In the method, the wettability strengths of different wetting agents in the same oil phase, or the wettability strengths of the same wetting agent in different oil phases, are judged according to the size of settling volume of the Barite powder in the solution, so that the method is simple and convenient to operate, and is visualized.
Description
Technical field
The present invention relates to a kind of evaluation method of the oil base drilling fluid wetting agent of in petroleum drilling and mining, using.
Background technology
Present evaluation method to the wetting agent wetting state has a variety of, is the contact angle mensuration comparatively accurately.This measuring method mainly is to utilize various means directly to observe the profile that is attached to bubble on the solid surface in equilibrium liquid pearl stable on the solid surface, the liquid, measures the angle according to contact angle definition indication.Also can ignore the influence of gravity for little liquid pearl and regard it as spherical crown, obtain contact angle with geometric knowledge.For example utilize the optical projection commercial measurement to go out the characteristic dimension of pendant drop under the surface of smooth solid, use simple The Fitting Calculation to draw the size of drip gauge surface tension and solid-liquid interface wetting angle then.Though this method can be carried out quantitative evaluation, very high to the requirement of instrument, also be subjected to operating personnel's influence simultaneously.
External occurred also that a kind of new method of measuring wetting angle---two twin crystal methods, this method can be measured advancing angle, receding angle and equilibrium contact angle.Because these class methods require highly to solid surface, and also can produce certain influence to the calculating of contact angle at the contour shape of imaging moment liquid pearl, therefore be subjected to constraint bigger in evaluation procedure.
Some other is experimental technique qualitatively, as power plate method, microporous barrier determination method, permeability-ratio curve method etc., more or less all there is certain uncertainty in its test method itself, and can not directly compare the wetting state quality of two kinds of wetting agents in different oil phases.Selectivity can better wetting agent exactly when carrying out the oil base drilling fluid performance adjustment.
Summary of the invention
At the problem that prior art exists, the object of the present invention is to provide a kind of evaluation method of oil base drilling fluid wetting agent, this method can be estimated the wetting state quality of different wetting agent in different oil base drilling fluid systems very intuitively, and method of operating is simple.
The evaluation method of a kind of oil base drilling fluid wetting agent of the present invention is: the oil-phase solution of wetting agent of preparation predetermined concentration, treat that wetting agent fully after the dissolving, adds a certain amount of barite powder and the barite powder is dispersed in the solution in oil phase; And then solution is placed constant temperature leaves standstill in the baking oven of uniform temperature, through measuring the bar volume of sedimentation after the schedule time, judge that according to the size of settling volume the different wetting agent is with the wetting state power in a kind of oil phase, or the wetting state power of wetting agent of the same race in different oil phases, settling volume is more little, and wetting state is strong more; Otherwise, then weak more.
Preferably, described bar granularity is 10～100 μ m.
The present invention utilizes the settling volume of barite powder in solution to be used as judging the different wetting agent with the wetting state power in a kind of oil phase, or the foundation of the wetting state power of wetting agent of the same race in different oil phases, and is not only simple, convenient, and directly perceived.
Embodiment
The present invention estimates according to following steps:
The oil-phase solution of step 1, the certain density wetting agent of preparation.Generally the solubility according to the drilling fluid preparation is about 1% (every preparation 100ml drilling fluid, the dosage of wetting agent is 1g).
Step 2, treat wetting agent in oil phase fully after the dissolving, measure the tool plug test tube (looking the volume that the test tube volume is determined the wetting agent oil solution of measuring) that a certain amount of volume injects the band scale with transfer pipet.
Step 3, take by weighing the barite powder of certain mass, slowly pour in the test tube.The barite powder in advance will be through 105 ℃ hyperthermia drying, about 2 hours of drying time.The granularity of barite powder is preferably 10～100 μ m.
Step 4, build the tool plug of test tube, vibration shakes up about about 30 seconds, and the barite powder is dispersed in vitro.
Step 5, the baking oven constant temperature that test tube is put into uniform temperature leave standstill (temperature that needs when temperature and testing performance of drilling fluid and decide), pick up counting.
Step 6, after two hours, record barite settling volume in vitro.
Step 7, according to the size of settling volume, judge that the different wetting agent is with the wetting state power in a kind of oil phase; Also can judge the wetting state power of wetting agent of the same race in different oil phases.Settling volume is more little, and wetting state is strong more; Otherwise, then weak more.
The wetting state of different solid phase surfaces is different, that is to say the amphipathic property difference.For the barite surface, the water wettability on its surface is greater than lipophilicity.When the barite powder in liquid phase constantly during sedimentation, inside has formed the tiny passage in a lot of apertures.According to capillary force as can be known, soaking into the liquid level of liquid in kapillary is spill, and concave meniscus imposes pulling force to following liquid; Not soaking into the liquid level of liquid in kapillary is convex, and meniscus presses to following liquid.
The effect of wetting agent is the water wettability that weakens the barite surface, strengthens lipophilicity.But because the difference of wetting ability, make the degree difference of the hydrophilic ability that in the different wetting agent solution, weakens barite powder surface.That is to say that in different wetting agent oil solutions, the water wettability of the capillary channel that barite forms varies in size in settling process.Do not soak into liquid though oil phase all belongs in these capillary channels, the power that is subjected to all is downward pressure, the varying in size of pressure.
For the stronger wetting agent of wetting state, it is relatively large to the degree that the barite surface hydrophilicity weakens, the water wettability of the capillary channel that barite forms when sedimentation a little less than, the pressure of portion within it being made the oil phase that flows relatively is less.The resistance that is subjected to when therefore oil phase upwards flows relatively is less, and the liquid phase volume that finally is strapped in barite powder inside is also just few more; Otherwise, when the wetting state of wetting agent is more weak, it is less relatively to the degree that the barite surface hydrophilicity weakens, the water wettability of the capillary channel that barite forms when sedimentation is stronger, the resistance that oil phase is subjected to when portion upwards flows relatively within it is bigger, and the liquid phase volume that finally is strapped in barite powder inside is also just big more.
The effect that the present invention uses:
At first, concerning the oil base drilling fluid system of same oil phase preparation, preferably during wetting agent, can use this kind method: the oil solution of preparation different wetting agent in preferred wetability, by judging the size of bar settling volume, can select to be fit to the wetting agent of this oil phase. Settling volume is more little, and the wetability of wetting agent is more strong.
Secondly, for wetting agent of the same race, its wetability in the oil base drilling fluid system of different oil phase preparations also has difference. When judging the most suitable which kind of oil phase of this wetting agent, also can use this kind method: the wetting agent solution of preparing different oil phases, by judging the size of bar settling volume, can judge that the wetability of this wetting agent in which kind of oil phase is the strongest, namely best with this oil phase compatibility. Settling volume is more little, and the wetability in this oil phase of wetting agent is more strong.
Claims (2)
1. the evaluation method of an oil base drilling fluid wetting agent, this method is: the oil-phase solution of the wetting agent of preparation predetermined concentration, treat that wetting agent fully after the dissolving, adds a certain amount of barite powder and the barite powder is dispersed in the solution in oil phase; And then solution is placed constant temperature leaves standstill in the baking oven of uniform temperature, through measuring the bar volume of sedimentation after the schedule time, judge that according to the size of settling volume the different wetting agent is with the wetting state power in a kind of oil phase, or the wetting state power of wetting agent of the same race in different oil phases, settling volume is more little, and wetting state is strong more; Otherwise, then weak more.
2. the method for claim 1 is characterized in that, described bar granularity is 10～100 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010521882 CN102053045A (en) | 2010-10-21 | 2010-10-21 | Evaluation method of oil-based drilling fluid wetting agent |
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| CN 201010521882 CN102053045A (en) | 2010-10-21 | 2010-10-21 | Evaluation method of oil-based drilling fluid wetting agent |
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| CN102053045A true CN102053045A (en) | 2011-05-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568669A (en) * | 2013-10-27 | 2015-04-29 | 中国石油化工集团公司 | Mud cake hydrophilicity and lipophilicity determination method |
| CN110018084A (en) * | 2019-04-12 | 2019-07-16 | 中国海洋石油集团有限公司 | A kind of wettability Slope map of pixels of oil-based drilling fluid wetting agent |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2002040625A1 (en) * | 2000-11-14 | 2002-05-23 | Seb S.A. | Cleaning composition for glass substrate, glass substrate, method for treating the substrate |
| CN101191764A (en) * | 2006-12-01 | 2008-06-04 | 中南大学 | Dust humectant performance measuring method |
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2010
- 2010-10-21 CN CN 201010521882 patent/CN102053045A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002040625A1 (en) * | 2000-11-14 | 2002-05-23 | Seb S.A. | Cleaning composition for glass substrate, glass substrate, method for treating the substrate |
| CN101191764A (en) * | 2006-12-01 | 2008-06-04 | 中南大学 | Dust humectant performance measuring method |
Non-Patent Citations (2)
| Title |
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| 《中国有色金属学报》 20070531 吴超等 粉尘湿润剂的性能测定新方法及其应用 第17卷, 第5期 2 * |
| 《工程热物理学报》 20090930 李海龙等 燃煤飞灰物理化学特性及其润湿机理研究 第30卷, 第09期 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568669A (en) * | 2013-10-27 | 2015-04-29 | 中国石油化工集团公司 | Mud cake hydrophilicity and lipophilicity determination method |
| CN104568669B (en) * | 2013-10-27 | 2017-03-08 | 中国石油化工集团公司 | A kind of mud cake amphipathic property assay method |
| CN110018084A (en) * | 2019-04-12 | 2019-07-16 | 中国海洋石油集团有限公司 | A kind of wettability Slope map of pixels of oil-based drilling fluid wetting agent |
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Application publication date: 20110511 |