CN108240950A - A kind of method for the evaluation of drilling fluid sealing characteristics - Google Patents
A kind of method for the evaluation of drilling fluid sealing characteristics Download PDFInfo
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- CN108240950A CN108240950A CN201611203341.4A CN201611203341A CN108240950A CN 108240950 A CN108240950 A CN 108240950A CN 201611203341 A CN201611203341 A CN 201611203341A CN 108240950 A CN108240950 A CN 108240950A
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- Prior art keywords
- drilling fluid
- landwaste
- experiment
- pore volume
- sealing characteristics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
Abstract
The present invention provides a kind of drilling fluid sealing characteristics evaluation method, pass through immersion of the rock core in drilling fluid under high-temperature and high-pressure conditions, to simulate closure situation of the drilling fluid to formation rock, then it is measured with specific surface and Porosimetry and impregnates front and rear rock core pore volume variation, so as to reflect the sealing characteristics of drilling fluid.The present invention can preferably simulate closure situation of the drilling fluid to stratum blowhole and microcrack, particularly nanometer, micron order blocks particle to the closure situation of rock, and evaluation effect is truer, stronger to the directiveness of wellbore construction.
Description
Technical field
The present invention relates to a kind of drilling liquid performance evaluating method, more particularly to a kind of drilling fluid sealing characteristics evaluation method.
Background technology
Mud shale microcrack is the one of the major reasons for causing cave-in.After mud shale meets water, since capillary is made
With water invades rock along microcrack, generates hydration, disperses mud shale, so as to cause the unstability of the borehole wall.Therefore,
In mud shale stratum drilling well, it is necessary to strengthen the shut-off capacity of drilling fluid, improve microcrack plugging effect.
The shut-off capacity of drilling fluid is evaluated indoors, the specific aim and using effect of field application can be improved.Mesh
Before, there are many kinds of the methods of domestic appraisal drilling liquid sealing characteristics.Such as use relatively broad FA type non-infiltration drilling fluid leak-offs
Instrument, the experiment instrument are using organic transparent glass as cylinder is tested, and pass through the intuitive measurement mud filtrate intrusion of nitrogen pressurization and simulate
Sill depth.Experiment condition is room temperature, middle pressure 0.69MPa.Manual measurement mud filtrate intrusive sheet depth, experiment is intuitive, letter
It is single, but function is single.《Oilfield chemistry》In 4th phase in 1999 " broken formation anti-caving agent for drilling fluid evaluation method and application "
It proposes to use a kind of high temperature and pressure dynamic filter press, using the artificial cores of certain pore throat, mud cake is determined by surveying filter loss
Shut-off capacity, but experiment core cannot be reused.For another example Xu Tongtai etc. exists《The evaluation method of drilling fluid sealing agent
And influence factor》It is middle to propose using high temperature and high pressure filter loss analyzer, measure drilling fluid HTHP filter losses, HTHP infiltrations dehydration,
Four indexs of HTHP Sand bed filtrations and the dehydration of HTHP casting beds carry out the plugging effect of appraisal drilling liquid（See《Drilling fluid and completion
Liquid》, 2009,26（2））.Yue Qiansheng etc. exists《The sealing characteristics research and application of oil base drilling fluid》It is middle to propose using hypotonic artificial
Core plugging calculates sealing ratiod to evaluate plugging effect（See《Drilling and completion fluids》, 2006,23（5））.Chinese patent
Publication number 101109739 discloses《A kind of bearing strength experiment instrument of high-temperature high-pressure mud cake plugging》With publication number 103048090A public affairs
A kind of evaluation method that sealing ratiod is evaluated using core permeability instrument is opened.
The shortcomings that these above-mentioned technologies or deficiency are：1. majority is directed to the evaluation appts of crack plugging effect, without special
Study microcrack（Fracture width is in 100 microns or less than 150 microns of crack）And hole plugging effect, evaluation effect have centainly
Limitation.2. the indexs such as drilling fluid HTHP filter losses, HTHP infiltration dehydration all cannot really simulate the closure feelings of drilling fluid
Condition, evaluation effect are limited.
Invention content
In order to solve the problems in the prior art, the purpose of the present invention is to, provide it is a kind of can for mud shale stratum microcrack and
Hole plugging effect is evaluated, and improves the applicability of evaluation method and the drilling fluid sealing characteristics evaluation method of validity.
In order to reach the purpose of the present invention, the technical proposal of the invention is realized in this way：
A kind of method for the evaluation of drilling fluid sealing characteristics is after measuring mud soak using specific surface and Porosimetry
Rock core pore volume variation, carry out the sealing characteristics of appraisal drilling liquid.
The implementation steps of this method are as follows：
1. being crushed to same rock core, landwaste is placed in formation water and evacuates to remove the air in rock sample；
2. the landwaste handled well is measured into total pore volume in specific surface and Porosimetry, as a reference value；
3. same landwaste is put into the high temperature and high pressure filter loss analyzer fluid strainer for filling drilling fluid, by professional standard SY/
T5621-93 temperature programmings, pressurization, are tested 30 minutes under 150 DEG C, 4.1MPa；
4. from high temperature and high pressure filter loss analyzer fluid strainer take out landwaste after, clean core surface deposit, then use than
2. surface and Porosimetry are remeasured landwaste total pore volume by above-mentioned steps；
5. by the variation of total pore volume, height of the drilling fluid to reservoir core plugging effect is compared.
The method is further：
Step 1. in same rock core is crushed to 5 ~ 10 mesh of landwaste grain size；
Step is 2. middle as follows using total pore volume operating procedure is measured in specific surface and Porosimetry：
Preparatory work of experiment：Gas circuit is connected first, opens air valve and pressure reducing valve；Then atmospheric value is measured, and sample is weighed with differential technique
Product；
Preliminary experiment：Preliminary experiment parameter is set on instrument, and then ventilation operation, is exhausted and vacuumizes；In liquid nitrogen cup
Middle addition liquid nitrogen, and corresponding position is risen to, it starts preparing for testing, records data after the completion；
Formal experiment：Experiment parameter on instrument is set first, then ventilation operation, is exhausted and vacuumizes；To sample cell
Heated, and systematic parameter is set, including atmospheric value, sample quality information；After the completion of heating, treat that sample cell cools down
Afterwards, liquid nitrogen is added in liquid nitrogen cup, and rises to corresponding position, starts formal experiment, treats that sample cell restores normal after the completion of experiment
Temperature clicks inflation and unloads sample cell, and close instrument and gas circuit.
The present invention mechanism be：Used specific surface and the action principle of Porosimetry are inhaled using the isothermal of nitrogen
Attached characteristic, i.e., under liquid nitrogen temperature nitrogen in the adsorbance of the surface of solids with nitrogen relative pressure（P/P0）And the characteristic become, when
P/P0Meet BET equations when in the range of 0.05-0.35, this is the foundation for measuring BET specific surface area；Work as P/P0 ≥ 0.4
When, capillary condensation phenomenon can be generated, the parameters such as pore-size distribution and total pore volume can be measured using this characterization of adsorption.So-called hair
Thin coacervation refers to, in a pore, if the liquid nitrogen surface of a spill can be formed because of suction-operated, with liquid level Cheng Ping
The nitrogen pressure of weighing apparatus must be less than the saturated vapour pressure of flat liquid level under same temperature, when capillary bore dia is smaller, concave meniscus
Radius of curvature is smaller, and the nitrogen pressure to balance each other with it is lower, in other words, can be relatively low when capillary bore dia is smaller
Under nitrogen partial pressure, coagulation liquid is formed, as pore size increases, coagulation liquid could be only formed under higher nitrogen pressure.
It is clear that due to the generation of capillary condensation phenomenon, some nitrogen is absorbed into micropore and into liquid, so that
The nitrogen adsorption capacity of sample surfaces significantly increases, and when being all full of in surface of solids all well by liquid adsorbate, adsorbance reaches
To maximum, and relative pressure P/P0Also reach maximum value 1.Opposite process is also the same, when adsorbance reaches maximum（It is full
With）Solid sample, when reducing its surface nitrogen gas relative pressure, the coagulation liquid in macropore is desorbed out first, with pressure
Continuously decrease, the coagulation liquid in descending hole gradually is desorbed out, therefore, by measuring isothermal adsorption and desorption
Curve, it is possible to which step-by-step calculation goes out pore-size distribution, total pore volume and average pore size etc..
Effect of the present invention is mainly reflected in：Closure feelings of the drilling fluid to stratum blowhole and microcrack can preferably be simulated
Condition, particularly nanometer, micron order block particle to the closure situation of rock, and evaluation effect is truer, to the finger of wellbore construction
The property led is stronger.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to
This.
The implementation steps of this method are as follows：
1. same rock core is crushed（5 ~ 10 mesh of landwaste grain size）, landwaste is placed in formation water and evacuates to remove rock sample
In air.
2. the landwaste handled well is measured into total pore volume in specific surface and Porosimetry, as a reference value.
3. same landwaste is put into the 42 type high temperature and high pressure filter loss analyzer fluid strainers for filling drilling fluid, by standard journey
Sequence heating, pressurization（See professional standard SY/T5621-93）, tested 30 minutes under 150 DEG C, 4.1MPa.
4. after taking out landwaste, cleaning core surface deposit, then total hole body is measured using specific surface and Porosimetry
Product.
5. by the variation of total pore volume, height of the drilling fluid to reservoir core plugging effect can be compared.
Specific embodiment：
1. same rock core is crushed（5 ~ 10 mesh of landwaste grain size）, landwaste is placed in formation water and evacuates to remove rock sample
In air.
2. the landwaste handled well is measured into total pore volume in specific surface and Porosimetry, as a reference value.Specific surface
And Porosimetry concrete operation step is as follows：
Preparatory work of experiment：Gas circuit is connected first, opens air valve and pressure reducing valve；Then atmospheric value is measured, and sample is weighed with differential technique
Product.
Preliminary experiment：Preliminary experiment parameter is set on instrument, and then ventilation operation, is exhausted and vacuumizes；In liquid
Liquid nitrogen is added in nitrogen cup, and rises to corresponding position, starts preparing for testing, records data after the completion.
Formal experiment：Experiment parameter on instrument is set first, then ventilation operation, is exhausted and vacuumizes；To sample
Quality control is heated, and sets systematic parameter, including information such as atmospheric value, sample qualities；After the completion of heating, sample is treated
After pipe cooling, liquid nitrogen is added in liquid nitrogen cup, and rise to corresponding position, start formal experiment, sample cell is treated after the completion of experiment
Restore room temperature, click inflation and unload sample cell, and close instrument and gas circuit.
3. above-mentioned landwaste is put into the 42 type high temperature and high pressure filter loss analyzer fluid strainers for filling drilling fluid, by standard journey
Sequence heating, pressurization（See professional standard SY/T5621-93）, tested 30 minutes under 150 DEG C, 4.1MPa.
4. after taking out landwaste, cleaning core surface deposit, then specific surface and Porosimetry are used by above-mentioned steps
Remeasure landwaste total pore volume.
5. by the variation of total pore volume, height of the drilling fluid to reservoir core plugging effect can be compared.
Empirically as a result, total pore volume reduced rate is bigger, drilling fluid plugging effect is better.
Claims (3)
1. a kind of method for the evaluation of drilling fluid sealing characteristics, it is characterized in that measuring drilling well using specific surface and Porosimetry
The pore volume variation of rock core after liquid immersion carrys out the sealing characteristics of appraisal drilling liquid.
2. the method according to claim 1 for the evaluation of drilling fluid sealing characteristics, it is characterized in that the implementation step of this method
It is rapid as follows：
1. being crushed to same rock core, landwaste is placed in formation water and evacuates to remove the air in rock sample；
2. the landwaste handled well is measured into total pore volume in specific surface and Porosimetry, as a reference value；
3. same landwaste is put into the high temperature and high pressure filter loss analyzer fluid strainer for filling drilling fluid, by professional standard SY/
T5621-93 temperature programmings, pressurization, are tested 30 minutes under 150 DEG C, 4.1MPa；
4. from high temperature and high pressure filter loss analyzer fluid strainer take out landwaste after, clean core surface deposit, then use than
2. surface and Porosimetry are remeasured landwaste total pore volume by above-mentioned steps；
5. by the variation of total pore volume, height of the drilling fluid to reservoir core plugging effect is compared.
3. the method according to claim 2 for the evaluation of drilling fluid sealing characteristics, it is characterized in that：
Step 1. in same rock core is crushed to 5 ~ 10 mesh of landwaste grain size；
Step is 2. middle as follows using total pore volume operating procedure is measured in specific surface and Porosimetry：
Preparatory work of experiment：Gas circuit is connected first, opens air valve and pressure reducing valve；Then atmospheric value is measured, and sample is weighed with differential technique
Product；
Preliminary experiment：Preliminary experiment parameter is set on instrument, and then ventilation operation, is exhausted and vacuumizes；In liquid nitrogen cup
Middle addition liquid nitrogen, and corresponding position is risen to, it starts preparing for testing, records data after the completion；
Formal experiment：Experiment parameter on instrument is set first, then ventilation operation, is exhausted and vacuumizes；To sample cell
Heated, and systematic parameter is set, including atmospheric value, sample quality information；After the completion of heating, treat that sample cell cools down
Afterwards, liquid nitrogen is added in liquid nitrogen cup, and rises to corresponding position, starts formal experiment, treats that sample cell restores normal after the completion of experiment
Temperature clicks inflation and unloads sample cell, and close instrument and gas circuit.
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| CN201611203341.4A CN108240950A (en) | 2016-12-23 | 2016-12-23 | A kind of method for the evaluation of drilling fluid sealing characteristics |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083630A (en) * | 2018-08-30 | 2018-12-25 | 陕西延长石油(集团)有限责任公司研究院 | A method of for appraisal drilling liquid sealing characteristics |
| CN111255445A (en) * | 2020-01-17 | 2020-06-09 | 西南石油大学 | Method and system for obtaining evaluation model, and evaluation method and evaluation system |
| CN113324882A (en) * | 2021-06-03 | 2021-08-31 | 重庆三峡学院 | Method for calculating particle blocking strength in porous medium under stress action |
| CN113933175A (en) * | 2020-06-29 | 2022-01-14 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for granular plugging material |
| CN113933175B (en) * | 2020-06-29 | 2024-04-30 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for particle plugging material |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083630A (en) * | 2018-08-30 | 2018-12-25 | 陕西延长石油(集团)有限责任公司研究院 | A method of for appraisal drilling liquid sealing characteristics |
| CN109083630B (en) * | 2018-08-30 | 2021-11-02 | 陕西延长石油(集团)有限责任公司研究院 | Method for evaluating plugging performance of drilling fluid |
| CN111255445A (en) * | 2020-01-17 | 2020-06-09 | 西南石油大学 | Method and system for obtaining evaluation model, and evaluation method and evaluation system |
| CN111255445B (en) * | 2020-01-17 | 2022-06-17 | 西南石油大学 | Method and system for obtaining evaluation model, and evaluation method and evaluation system |
| CN113933175A (en) * | 2020-06-29 | 2022-01-14 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for granular plugging material |
| CN113933175B (en) * | 2020-06-29 | 2024-04-30 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for particle plugging material |
| CN113324882A (en) * | 2021-06-03 | 2021-08-31 | 重庆三峡学院 | Method for calculating particle blocking strength in porous medium under stress action |
| CN113324882B (en) * | 2021-06-03 | 2023-06-30 | 重庆三峡学院 | Calculation method for blocking strength of particles in porous medium under stress effect |
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Application publication date: 20180703 |