CN106124400A - A kind of high-density water-based drilling fluid mud cake quality evaluation methodology - Google Patents
A kind of high-density water-based drilling fluid mud cake quality evaluation methodology Download PDFInfo
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- CN106124400A CN106124400A CN201610451756.7A CN201610451756A CN106124400A CN 106124400 A CN106124400 A CN 106124400A CN 201610451756 A CN201610451756 A CN 201610451756A CN 106124400 A CN106124400 A CN 106124400A
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Abstract
Mud cake quality evaluation methodology is formed during the present invention relates to a kind of high-density water-based drilling fluid system drilling.Can preferably evaluate high-density water-based drilling fluid mud cake quality overall permanence, provide foundation for instructing mud cake quality to control.It can be reduced or eliminated wellbore stability, downhole safety and the reservoir protection problem come because of drilling fluid mud cake quality difference band.Its technical scheme: the evaluation procedure of this evaluation methodology is: the drilling fluid mud cake that first taking-up drilling fluid is formed in high-temperature and high-pressure filter press is placed in mud cake tester, tests out Hc, Hd, Hs, Pi and Pf parameter, and draws intensity thickness curve；Drilling fluid mud cake is placed in middle pressure filter press again and records Kf, according to intensity thickness curve and real thickness, toughness, compactness, slickness, intensity, lubricity index evaluation mud cake quality overall permanence；Finally draw judge conclusion and overall merit statement.Site operation is had preferable directive significance, for the evaluation of high-density water-based drilling fluid mud cake quality.
Description
Technical field
The present invention relates to a kind of height forming mud cake quality situation during high-density water-based drilling fluid system drilling
Density water-base drilling fluid mud cake quality evaluation methodology, can preferably evaluate high-density water-based drilling fluid mud cake quality overall permanence,
Foundation is provided for instructing mud cake quality to control.
Background technology
During using high-density water-based drilling fluid system drilling, it is desirable to drilling fluid forms thin, tough, fine and close high-quality mud
Cake, the mud cake of high-quality can have the lowest or almost nil affinity by landwaste embedding to drilling tool, drill bit, bottom hole assemblies and bag.But
It is that this important indicator of mud cake quality is often touched on lightly by people, paid attention to not.As measured high-density water-based drilling fluid system
During dehydration, require the most simply to reduce dehydration, and do not focus on the quality of mud cake.No matter at indoor or scene, pass through
Regulation and control, can accomplish that dehydration is the lowest, but API mud cake is the thickest meticulously, and especially HTHP mud cake is surprisingly, empty and loose thick, its
Result is illusion, and its reason is: (1) solid phase particles is many, and disorderly and unsystematic deposit buildup forms the mud cake of thickness and void at the arc borehole wall,
By mud cake resistance, filter medium resistance effect, slow down filtration rate, measure, in causing the stipulated time, the illusion that dehydration is low；
(2) it is deposited in numerous solid phase particles and the drag force of filter medium of the arc borehole wall, reduces the seepage velocity of filtrate, cause rule
The illusion that interior measurement dehydration of fixing time is low；(3) drilling fluid be seriously thickened, rheological characteristic poor, but dehydration is little, but mud cake is thick, empty, thin
Pine, after dilute, rheological characteristic makes moderate progress, and dehydration reduces on the contrary.Mud cake quality difference means that mud cake is thick and empty, loose, infiltration
Rate is high, dehydration is big, (1) mud cake will be caused to adhere to bit freezing, differential sticking or pressure excited；(2) mud cake is the thickest, drilling tool and mud cake
Contact area increases, and viscous card power increases, and unfreezing is more difficult to, the most of no avail sometimes through various unfreezing modes, increase drilling cost,
Extending drilling period, severe patient is stuck to be scrapped, and causes great economic loss；(3) mud cake thick and empty, loose, permeability is high, lose
Water is big, and due to darcy osmosis, substantial amounts of filtrate enters stratum, causes water-sensitive strata (stratum that smectite content is high) to inhale
Water expands, and borehole wall undergauge causes reaming, lock of tool drilling；(4) mud cake thick and empty, loose, permeability is high, dehydration is big, due to hollow billet
Pressure effect, substantial amounts of filtrate enters stratum, is likely to result in water-sensitive formation hole collapse etc..Visible, various types of wells are asked
Inscribing relevant with mud cake character the most directly or indirectly, the quality of mud cake quality is directly connected to wellbore stability, cementing quality, down-hole
Safety and reservoir protection problem.Therefore, high-density water-based drilling fluid mud cake quality method for quantitatively evaluating set up extremely urgent.
But, until today, evaluating of mud cake quality is also limited only to Scale ruler measurement, needle penetration method and artificial sight with measuring
Survey method, without bioassay standard, especially not clear to index to be measured, imperfection, the fragmentary instrument occurred also is limited only to
Desk research, desirable parameter is little, and evaluation method and standard are simple and crude, coarse, lacks scientific and operability, it is impossible to be used for referring to
Lead produced on-site.In order to improve site operation quality, wellbore stability because drilling fluid mud cake quality difference band come, well are reduced or eliminated
Lower safety and reservoir protection problem, be badly in need of setting up high-density water-based drilling fluid mud cake matter a kind of science, workable
Amount evaluation methodology.
Summary of the invention
It is an object of the invention to: in order to improve site operation quality, be reduced or eliminated because drilling fluid mud cake quality difference band comes
Wellbore stability, downhole safety and reservoir protection problem, special provide a kind of high-density water-based drilling fluid mud cake quality to comment for this
Valency method.
In order to achieve the above object, the present invention is by the following technical solutions: a kind of high-density water-based drilling fluid mud cake quality
Evaluation methodology, is characterized in that high-density water-based drilling fluid mud cake quality evaluation procedure used by this evaluation methodology and the water base brill of high density
Well liquid mud cake quality overall merit statement:
1, the comprising the concrete steps that of high-density water-based drilling fluid mud cake quality integrated evaluating method:
1) first take the high-density water-based drilling fluid system of a certain amount of on-the-spot application, pour GGS42-2A type API High Temperature High Pressure into
In filter press kettle, high-temperature and high-pressure filter press temperature is heated to consistent with on-the-spot downhole temperature, under 3.5MPa pressure, warp
30min prepares the mud cake that high-density water-based drilling fluid system is formed；
2) the residual drilling fluid system in High Temperature High Pressure kettle is poured out, take out high-density water-based drilling fluid at API high temperature
The drilling fluid mud cake formed in high pressure filter press, is placed on after rinsing gently with clear water in DL-II type mud cake tester, by standard
Method records 5 underlying parameters such as compression thickness Hc, closely knit thickness Hd, fine and close thickness Hs, initial strength Pi, final strength Pf,
And draw with intensity as vertical coordinate, the thickness curve as abscissa；
3) again drilling fluid mud cake is placed in ZNS-5A type API pressure filter press in by standard method record mud cake adhere to system
Number Kf, according to above-mentioned thickness-intensity curve, and by 6 indexs such as real thickness, toughness, compactness, slickness, intensity, lubricities
Evaluation mud cake quality overall permanence；
4) conclusion is passed judgment on: when: the real thick Ht of (1) mud cake is less than 3mm；(2) having curved section, mud cake bending does not ruptures；(3) fine and close
Layer is thin, radius of curvature is little, PfGreatly, according to Hc, Hd, Hs calculate compressible coefficient Cc=Hc/Ht, packing coefficient Cd=Hd/Ht,
The real thick Ht=Hc+Hd+Hs of compacting factor Cs=Hs/Ht, mud cake, meets Cs＜ Cc＜ CdMud cake quality is preferably；(4) smooth and light
Sliding；(5) final strength PfValue is more than 1200g；(6) sticking coefficient KfLess than 0.2, then mud cake is thin, fine and close, intensity is high, good toughness,
Lubricity is good, if it is short and smooth to meet whole piece curve simultaneously, and Pi≥20g、Pf>=1200g, then mud cake composition is uniformly, total quality
Excellent.
2, high-density water-based drilling fluid mud cake quality overall merit statement is as follows, finally by evaluating data and evaluation conclusion
Insert in statement,
High-density water-based drilling fluid mud cake quality overall merit statement
This appraisal report book is used for evaluating mud cake quality.
DL-II type mud cake tester, API used by above-mentioned evaluation methodology press filter press and API high-temperature and high-pressure filter press equal
For selling product on market, strictly by industry standard or enterprise's mark inspection when purchasing, eligible could use.Specifically it is shown in Table 1.
1 high-density water-based drilling fluid mud cake evaluation methodology instrument detail list of table
The high-density water-based drilling fluid mud cake evaluation methodology that the present invention provides is commented with used high density drilling well mud cake at present
Valency method compares and has the advantages that: 1. has the theoretical direction of science, the most blindly evaluates mud cake quality, has certain section
The property learned；2. there is the evaluation procedure of specification, workable；3. mud cake overall permanence appraisal report book is given, to mud cake matter
The quality of amount is very clear；4. give concrete evaluation procedure, site operation is had preferable directive significance.
Detailed description of the invention:
Below in conjunction with instantiation, the present invention is further illustrated
Example 1: the most northern 302 well high-density water-based drilling fluid mud cake qualities are evaluated
1, the most northern 302 well high-density water-based drilling fluid mud cake quality evaluation procedures:
(1) first take the most northern 302 well high-density water-based drilling fluids of a certain amount of on-the-spot application, pour GGS42-2A type AP high temperature into
In high pressure filter press kettle, high-temperature and high-pressure filter press temperature is heated to 150 DEG C, under 3.5MPa pressure, prepares through 30min big
The mud cake that north 302 well high-density water-based drilling fluid systems are formed；
(2) the residual drilling fluid system in High Temperature High Pressure kettle is poured out, take out the most northern 302 well high-density water-based drilling fluids
In API high-temperature and high-pressure filter press formed drilling fluid mud cake and be placed in DL-II type mud cake tester, draw with intensity be
Vertical coordinate, thickness are the curve of abscissa, it is thus achieved that compression thickness Hc, closely knit thickness Hd, fine and close thickness Hs, initial strength Pi,
5 underlying parameters such as whole intensity Pf；
(3) more northern 302 well high-density water-based drilling fluid mud cakes are placed in API in pressure filter press and obtain by standard method
Obtain mud cake sticking coefficient Kf.By thickness-intensity curve, and by real thickness, toughness, compactness, slickness, intensity, lubricity
Deng 6 index evaluation mud cake quality overall permanences；
(4) fill in mud cake quality overall merit statement, by the data of statement the quality of mud cake quality made and commenting
Valency.
2, the most northern 302 well high-density water-based drilling fluid mud cake quality overall merit statements:
The most northern 302 well high-density water-based drilling fluid mud cake quality overall merit statements
The most northern 302 well high density can be obtained from the most northern 302 well high-density water-based drilling fluid mud cake quality overall merit statements
Water-base drilling fluid mud cake meets indices requirement, and mud cake total quality is excellent.
Accompanying drawing explanation
Fig. 1 is cake thickness and mud cake intensity institute in drilling fluid mud cake quality overall merit statement test event of the present invention
The coordinate axes schematic diagram needed.
Fig. 2 is that in the most northern 302 well high-density water-based drilling fluid mud cake quality overall merit statement test events, mud cake is strong
Spend the coordinate curve with cake thickness change.
Claims (2)
1. a high-density water-based drilling fluid mud cake quality evaluation methodology, is characterized in that: high density used by this evaluation methodology is water base
Comprising the concrete steps that of drilling fluid mud cake quality integrated evaluating method:
1) first take the high density drilling fluid system of a certain amount of on-the-spot application, pour GGS42-2A type API high-temperature and high-pressure filter press still into
In body, high-temperature and high-pressure filter press temperature is heated to consistent with on-the-spot downhole temperature, under 3.5MPa pressure, prepares through 30min
The mud cake that high-density water-based drilling fluid system is formed；
2) the residual drilling fluid system in High Temperature High Pressure kettle is poured out, take out high-density water-based drilling fluid in API High Temperature High Pressure
The drilling fluid mud cake formed in filter press, is placed on after rinsing gently with clear water in DL-II type mud cake tester, by standard method
Record 5 underlying parameters such as compression thickness Hc, closely knit thickness Hd, fine and close thickness Hs, initial strength Pi, final strength Pf, and paint
System with intensity as vertical coordinate, the thickness curve as abscissa；
3) again drilling fluid mud cake is placed in ZNS-5A type API in pressure filter press and records mud cake sticking coefficient by standard method
Kf, according to above-mentioned thickness-intensity curve, and is commented by 6 indexs such as real thickness, toughness, compactness, slickness, intensity, lubricities
Determine mud cake quality overall permanence；
4) conclusion is passed judgment on: when: the real thick Ht of (1) mud cake is less than 3mm；(2) having curved section, mud cake bending does not ruptures；(3) compacted zone
Thin, radius of curvature is little, PfGreatly, compressible coefficient Cc=Hc/Ht, packing coefficient Cd=Hd/Ht, cause are calculated according to Hc, Hd, Hs
The real thick Ht=Hc+Hd+Hs of close coefficient Cs=Hs/Ht, mud cake, meets Cs＜ Cc＜ CdMud cake quality is preferably；(4) smooth and smooth；
(5) final strength PfValue is more than 1200g；(6) sticking coefficient KfLess than 0.2, then mud cake is thin, fine and close, intensity is high, good toughness, lubrication
Property is good, if it is short and smooth to meet whole piece curve simultaneously, and Pi≥20g、Pf>=1200g, then mud cake composition is uniformly, and total quality is excellent.
The most according to claim 1, high-density water-based drilling fluid mud cake quality is evaluation methodology, it is characterized in that: by evaluating data
And evaluation conclusion finally fills in into high-density water-based drilling fluid mud cake quality overall merit statement:
High-density water-based drilling fluid mud cake quality overall merit statement
This appraisal report book is used for evaluating mud cake quality.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107573912A (en) * | 2017-10-23 | 2018-01-12 | 中国石油大学(华东) | Mud cake elasticity agent, its preparation method and application and mud cake molding simulation method |
| CN109281654A (en) * | 2017-07-19 | 2019-01-29 | 中国石油天然气股份有限公司 | Method for evaluating quality of mud cake before well cementation |
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| CN101963609A (en) * | 2010-09-10 | 2011-02-02 | 中国海洋石油总公司 | Mud cake performance comprehensive evaluation method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281654A (en) * | 2017-07-19 | 2019-01-29 | 中国石油天然气股份有限公司 | Method for evaluating quality of mud cake before well cementation |
| CN109281654B (en) * | 2017-07-19 | 2022-03-01 | 中国石油天然气股份有限公司 | Method for evaluating quality of mud cake before well cementation |
| CN107573912A (en) * | 2017-10-23 | 2018-01-12 | 中国石油大学(华东) | Mud cake elasticity agent, its preparation method and application and mud cake molding simulation method |
| CN107573912B (en) * | 2017-10-23 | 2020-03-31 | 中国石油大学(华东) | Mud cake elasticizer, preparation method and application thereof, and mud cake forming simulation method |
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Inventor after: Wang Pingquan Inventor after: Jing Yujuan Inventor after: Wang Qiurun Inventor after: Bai Yang Inventor after: Chen Ting Inventor after: Tao Peng Inventor after: Shi Xian Inventor after: Yang Ping Inventor after: Deng Jiading Inventor before: Wang Pingquan Inventor before: Jing Yujuan Inventor before: Bai Yang Inventor before: Chen Ting Inventor before: Tao Peng Inventor before: Shi Xian Inventor before: Yu Bingyang Inventor before: Yang Ping |
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Application publication date: 20161116 |