CN106543988B - A kind of drilling shale filtrate reducing caving control drilling fluid - Google Patents
A kind of drilling shale filtrate reducing caving control drilling fluid Download PDFInfo
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- CN106543988B CN106543988B CN201610973796.8A CN201610973796A CN106543988B CN 106543988 B CN106543988 B CN 106543988B CN 201610973796 A CN201610973796 A CN 201610973796A CN 106543988 B CN106543988 B CN 106543988B
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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
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
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Abstract
The present invention relates to a kind of drilling shale filtrate reducing caving control drilling fluids for shale gas exploitation.It can overcome borehole well instability, and shale formation aquation is inhibited to collapse.Its technical solution is to prepare the raw materials used component of the drilling fluid and its content is, mass unit is gram: tap water 1000；Drilling fluid bentonite 30-50；Na2CO31.5-2.5；Extracting and cutting agent MMH 2-5；Viscosity depressant for drilling fluid WT-1 10-20；Fluid loss additive DSP-2 10-15；Drilling fluid anti-sloughing agent HFT-301 10-15；Fluid loss additive for boring fluid WFL-1 5-10；High pressurization sealing agent CSD-1 10-20；Anti-collapse III 15-20 of sealing agent FF- of drilling fluid；Drilling fluid unstressed configuration fluid lubricant JX-108 2-3；It is finally 9.0 with 40% NaOH regulation system pH.Barite regulating density of drilling liquid is added to 1.15g/cm after stirring 30min3This drilling shale filtrate reducing caving control drilling fluid is made.This drilling fluid system environmental pollution is small, has good rheological characteristic, low Poison, inhibits shut-off capacity strong, is used for shale drilling well.
Description
Technical field
The present invention relates to a kind of drilling shale filtrate reducing caving control drilling fluids for shale gas exploitation, are particularly suitable for
In the drilling of the long net horizontal section of shale of microcrack development.
Background technique
Shale gas well generallys use oil base drilling fluid both at home and abroad at present, since hygroscopicity shale can be improved in oil base drilling fluid
Capillary pressure prevents intrusion of the drilling fluid to shale can be effectively by using oil base drilling fluid and synthetic base drilling fluid
Solve the problems, such as hole instability.It is external using oil base drilling fluid system in terms of coping with shale gas horizontal well wellbore stability
Current most effective measure.Even if using oil base drilling fluid, the shale formation of fracture or stratification development, it is necessary to strengthen envelope
It is stifled, enter the transmitting of pressure caused by stratum (block fluid channel) to reduce liquid.Oil base drilling fluid is in lubrication, anti-sticking and drop resistance
The advantage that effect aspect has water-base drilling fluid incomparable, drags pressure problem when can be to avoid slide drilling, this is also that it is wide
Where the basic reason of general application.But it causes to hurt since oil base working solution makes the wettability modification of low permeability pay and gas-bearing formation
Evil, is greatly lowered reservoir permeability, to reduce oil well output.Indoor core experiment shows to be changed into when core by hydrophilic
When oleophylic, recovery ratio falls to 17% by 51%.Therefore, production cautiously should be opened using oil base drilling fluid brill in low permeability pay
Layer, when especially having emulsifier, surfactant in oil base drilling fluid.It is said from the angle of wellbore stability, in shale gas drilling well
70% or more wellbore problem be as shale it is unstable caused by.After drilling fluid passes through stratum crack, crack and weak level,
Drilling fluid and shale interaction change the pore pressure and shale intensity of shale, eventually affect the stability of shale.Return
The main reason for receiving, influencing wellbore stability be such as: pore pressure variation causes borehole well instability, shale and pore liquid it is mutual
Effect, changes the size of Hydrogeochemical anomaly or swelling stress between clay layer.Filtrate enters stratification gap, clay mineral in shale
Water-swellable, the bulbs of pressure increase tension, lead to shale formation tensile fracture；On the contrary, making to open if reducing Hydrogeochemical anomaly
Power reduces, and generates mud shale and shrinks and (part) stabilization；For low-permeability shale formation, since filtrate is slowly invaded
Enter, gradually the pore pressure (typically about several days time) of balanced drilling hydraulic coupling and the nearly borehole wall, therefore loses effective brill
The supporting role of well liquid column pressure.Since the repulsive interaction of Hydrogeochemical anomaly increases pore pressure, shale will receive shearing or open
The pressure of power mode reduces the nearly borehole wall effective stress for making shale intergranular be bound up, and induces borehole well instability.
Advantage and disadvantage water-base drilling fluid advantage compared to oil base drilling fluid has: 1. environmentally friendly；2. natural gas leaching easily discovery；3. temperature
It is smaller to rheology impact；4. cost is relatively low；5. meeting leakage to be easily processed, disadvantage has: 1. borehole wall stability is poor；2. hot steady
It is qualitative relatively poor, it is easy to high temperature gel；3. resistance tocrocking poor (solid phase and CO2、H2S gaseous contamination), maintenance processing workload
Greatly；4. lubricating anti-sticking scarce capacity.Therefore, a kind of novel water-based drilling fluid substitution oil base brill that can be suitably used for shale formation is developed
Well liquid be able to solve the problems such as wellbore stability, reservoir pollution then and be current shale gas drilling well key technology and domestic and international page
Where the difficult point of rock drilling well.
Summary of the invention
The purpose of the present invention is: borehole well instability when in order to overcome the problems, such as to use water-base drilling fluid to creep into shale formation at present,
Inhibit shale formation aquation to collapse, can effectively block the micro-nano slit of shale, provide a kind of drilling shale filtrate reducing thus
Caving control drilling fluid.
In order to achieve the above object, the invention adopts the following technical scheme: a kind of drilling shale filtrate reducing caving control
Drilling fluid, it is characterized in that preparing the raw materials used component of the drilling fluid and content is, wherein mass unit is gram:
The NaOH solution regulation system pH value for being 40% with mass percentage concentration is 9.0；It is close that drilling fluid is adjusted with barite
It spends to 1.15g/cm3。
A kind of drilling shale of the present invention is with the preparation method of filtrate reducing caving control drilling fluid:
It first measures 1000 grams of tap water and water temperature is risen to 75 DEG C, 30-50 is added under low speed 500r/min electric stirring
Gram drilling fluid bentonite, stir 10min, be added 1.5-2.5 grams of Na2CO3It is stirred for 30min, prehydration under normal temperature and pressure
24h；2-5 grams of extracting and cutting agent MMH is added under high speed 8000r/min electric stirring again and stirs 10min, it is electronic in low speed 500r/min
It is added with stirring 10-20 grams of viscosity depressant for drilling fluid WT-1 stirring 15min, 10-15 grams of fluid loss additive DSP-2 stirring is added
5min is added 10-15 grams of drilling fluid with anti-sloughing agent HFT-301 and stirs 10min；Then 5-10 grams of fluid loss additive for boring fluid is added
WFL-1 stirs 15min, and pressurization sealing agent CSD-1 10-20 grams high is added and stirs 5min, the anti-collapse envelope of 15-20 grams of drilling fluid is added
Blocking agent FF-III stirs 15min, and 2-3 grams of drilling fluid is added with unstressed configuration fluid lubricant JX-108 and stirs 10min；Finally use
NaOH adds water to be configured to 40% lye, and regulation system pH is 9.0.Barite regulating density of drilling liquid is added after stirring 30min
To 1.15g/cm3Stirring 1 hour, is made this drilling shale filtrate reducing caving control drilling fluid.
Drilling fluid bentonite, Na used in above-mentioned preparation method2CO3, extracting and cutting agent MMH, viscosity depressant for drilling fluid WT-1, drop
Fluid loss agents DSP-2, it drilling fluid anti-sloughing agent HFT-301, fluid loss additive for boring fluid WFL-1, high pressurization sealing agent CSD-1, bores
Well liquid is that sale in the market produces with anti-collapse sealing agent FF-III, drilling fluid with unstressed configuration fluid lubricant JX-108, barite
Product are strictly examined by professional standard or enterprise's mark when purchasing, and eligible could use.Specifically it is shown in Table 1.
1 drilling shale of table filtrate reducing caving control drilling fluid base stock detail list
Drilling shale provided by the invention filtrate reducing caving control drilling fluid and at present used shale wellbore fluid
System compares and has the advantages that: 1. this drilling fluid is small compared to oil base drilling fluid environmental pollution；2. having stronger inhibition envelope
Stifled ability；3. caving pressure can be effectively reduced；4. meeting leakage to be easily processed.
Specific embodiment:
Below with reference to specific example, the present invention is further illustrated
A kind of example 1: preparation method for creeping into shale filtrate reducing caving control drilling fluid.
It first measures 1000 grams of tap water and water temperature is risen to 75 DEG C, 50 grams are added under low speed 500r/min electric stirring
Drilling fluid bentonite stirs 10min, 2.5 grams of Na is added2CO3It is stirred for 30min, prehydration is for 24 hours under normal temperature and pressure；Again in height
2 grams of extracting and cutting agent MMH are added under fast 8000r/min electric stirring and stir 10min, are added 10 under low speed 500r/min electric stirring
Gram viscosity depressant for drilling fluid WT-1 stirs 15min, and 15 grams of fluid loss additive DSP-2 stirring 5min are added, 15 grams of drilling fluids are added and use
Anti-sloughing agent HFT-301 stirs 10min；Then 5 grams of fluid loss additive for boring fluid WFL-1 are added and stir 15min, 10 grams of Gao Cheng are added
It presses sealing agent CSD-1 to stir 5min, 15 grams of drilling fluids is added with anti-collapse sealing agent FF-III and stir 15min, 2 grams of drilling fluids are added
10min is stirred with unstressed configuration fluid lubricant JX-108；Finally water is added to be configured to 40% lye with NaOH, regulation system pH is
9.0.Barite regulating density of drilling liquid is added to 1.15g/cm after stirring 30min3This drilling shale use is made in stirring 1 hour
Filtrate reducing caving control drilling fluid.
Example 2: rolling rate of recovery measurement has been carried out to drilling fluid system of the present invention using XGRL-2 type roller heating furnace.
2 drilling fluid system rolling rate of recovery experimental results of table
| Drilling fluid composition | Experiment condition | It recycles quality (g) | The rate of recovery (%) |
| Clear water+50g red beds soil | 105℃/16h | 5.54 | 11.08 |
| Drilling fluid system+50g red beds soil | 105℃/16h | 48.32 | 96.64 |
Note: 1) red beds soil is Sichuan red beds soil landwaste, and it is 6~10 mesh, the rate of recovery that shale is appeared appears for long 7 shale
To cross the 40 mesh rate of recovery；2) result is 2 experimental data mean values in table.
3 drilling fluid system linear expansion experimental results of table
Note: 1) core is drilling fluid bentonite (matching puddled soil) compression moulding；2) filtrate is after system heat rolls 105 DEG C/16h
The filtrate of extrusion；3) result is 2 experimental data mean values in table.
It is tested by table 2, the rolling rate of recovery of 3 drilling fluid of table and linear expansion rate it is found that rolling rate of recovery reaches 95%
More than, 16h linear expansion rate only has 22.08% to have preferable inhibition aquation dispersion and dilatancy.
Example 3: it is rolled using XGRL-2 type roller heating furnace Continuous Heat, tests the drilling fluid basic performance and heat-resisting property.
4 drilling fluid system basic performances of table and heat-resisting property evaluation
By basic performance and the heat-resisting property of the drilling shale of table 4 filtrate reducing caving control drilling fluid it is found that system has
There are good temperature resistance and basic performance.
Claims (1)
1. a kind of drilling shale filtrate reducing caving control drilling fluid, which is characterized in that drilling shale filtrate reducing inhibits anti-
Collapse drilling fluid preparation method include: first measure 1000g tap water water temperature is risen to 75 DEG C, in low speed 500r/min electric mixing
The lower drilling fluid bentonite that 50g is added is mixed, l0min is stirred, 2.5gNa is added2CO3It is stirred for 30min, pre- water under normal temperature and pressure
Change for 24 hours；2g extracting and cutting agent MMH is added under high speed 8000r/min electric stirring again and stirs l0min, it is electronic in low speed 500r/min
It is added with stirring 10g viscosity depressant for drilling fluid WT-1 stirring 15min, 15g fluid loss additive DSP-2 is added and stirs 5min, 15g is added
Drilling fluid stirs l0min with anti-sloughing agent HFT-301；Then 5g fluid loss additive for boring fluid WFL-1 is added and stirs 15min, is added
10g high pressurization sealing agent CSD-1 stirs 5min, and 15g drilling fluid is added with anti-collapse sealing agent FF-III and stirs 15min, 2g is added
Drilling fluid stirs l0min with unstressed configuration fluid lubricant JX-108；Finally add water to be configured to 40% lye with NaOH, adjusts body
Be pH be 9.0；Barite regulating density of drilling liquid is added to 1.15g/cm after stirring 30min3Stirring 1 hour.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610973796.8A CN106543988B (en) | 2016-11-05 | 2016-11-05 | A kind of drilling shale filtrate reducing caving control drilling fluid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610973796.8A CN106543988B (en) | 2016-11-05 | 2016-11-05 | A kind of drilling shale filtrate reducing caving control drilling fluid |
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| CN106543988A CN106543988A (en) | 2017-03-29 |
| CN106543988B true CN106543988B (en) | 2019-03-26 |
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| CN110846001A (en) * | 2019-11-21 | 2020-02-28 | 中国电建集团成都勘测设计研究院有限公司 | Drilling fluid for coring in high unconsolidated formation and preparation method and application thereof |
Citations (7)
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| CN101935519A (en) * | 2010-08-09 | 2011-01-05 | 中联煤层气国家工程研究中心有限责任公司 | Drilling fluid and preparation method thereof |
| CN103725272A (en) * | 2014-01-16 | 2014-04-16 | 中国地质大学（武汉） | Water-based drilling fluid for stabilizing shale |
| CN104694092A (en) * | 2015-03-30 | 2015-06-10 | 中国石油大学(华东) | Water-based drilling fluid of shale gas horizontal well reinforced well wall and application thereof |
| CN104927805A (en) * | 2015-06-25 | 2015-09-23 | 山东得顺源石油科技有限公司 | High-density water-based drilling fluid applicable to continental deposit sensitive shale formation |
| CN105018051A (en) * | 2015-08-12 | 2015-11-04 | 中国海洋石油总公司 | Intelligent blocking water-based drilling fluid |
| CN105038736A (en) * | 2015-06-17 | 2015-11-11 | 成都高普石油工程技术有限公司 | Positive-charged polyglycol anti-collapse drilling fluid |
| CN105733527A (en) * | 2016-04-20 | 2016-07-06 | 西南石油大学 | High-density drilling fluid densified with hausmannite powder |
-
2016
- 2016-11-05 CN CN201610973796.8A patent/CN106543988B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935519A (en) * | 2010-08-09 | 2011-01-05 | 中联煤层气国家工程研究中心有限责任公司 | Drilling fluid and preparation method thereof |
| CN103725272A (en) * | 2014-01-16 | 2014-04-16 | 中国地质大学（武汉） | Water-based drilling fluid for stabilizing shale |
| CN104694092A (en) * | 2015-03-30 | 2015-06-10 | 中国石油大学(华东) | Water-based drilling fluid of shale gas horizontal well reinforced well wall and application thereof |
| CN105038736A (en) * | 2015-06-17 | 2015-11-11 | 成都高普石油工程技术有限公司 | Positive-charged polyglycol anti-collapse drilling fluid |
| CN104927805A (en) * | 2015-06-25 | 2015-09-23 | 山东得顺源石油科技有限公司 | High-density water-based drilling fluid applicable to continental deposit sensitive shale formation |
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| CN105733527A (en) * | 2016-04-20 | 2016-07-06 | 西南石油大学 | High-density drilling fluid densified with hausmannite powder |
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