CN105969325B - A kind of drilling shale salt resistance leakproof drilling fluid - Google Patents

A kind of drilling shale salt resistance leakproof drilling fluid Download PDF

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Publication number
CN105969325B
CN105969325B CN201610517164.0A CN201610517164A CN105969325B CN 105969325 B CN105969325 B CN 105969325B CN 201610517164 A CN201610517164 A CN 201610517164A CN 105969325 B CN105969325 B CN 105969325B
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drilling fluid
drilling
added
shale
grams
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CN105969325A (en
Inventor
白杨
石晛
王平全
陈婷
陶鹏
敬玉娟
余冰洋
杨萍
胡亚琴
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Southwest Petroleum University
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Southwest Petroleum University
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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
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/22—Synthetic organic compounds
    • C09K8/24—Polymers
    • 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
    • C09K2208/04—Hulls, shells or bark containing well drilling or treatment fluids
    • 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
    • C09K2208/08—Fiber-containing well treatment fluids
    • 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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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Earth Drilling (AREA)

Abstract

The present invention relates to a kind of drilling shale salt resistance leakproof drilling fluids for shale gas exploitation.It can overcome borehole well instability, and shale formation aquation is inhibited to collapse, and block leakage stratum.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 900-1000；Drilling fluid macroemulsion EMP 2-5；Emulsifier EM L-1 0.5-1；Drilling fluid compound leakage stop agent FD-1 10-15；Drilling fluid anticalcium salt resistant filter loss reduction agent BDF-200L 0.15-1；Highly-efficient lubricant for drilling fluid THN-1 2-5；Fluid loss additive for boring fluid DD-QK 5-10；Shale-control agent for drilling fluid LWJ-1 10-20；Drilling fluid compound leakage stop agent CD-FH-1 8-10；Finally water is added to be configured to 40% lye with NaOH, regulation system pH is 8.5.Barite regulating density of drilling liquid is added to 1.20g/cm after stirring 30min3Stirring 1 hour, is made this drilling fluid.This drilling fluid system environmental pollution is small, has good rheological characteristic, lubricity, inhibits shut-off capacity strong, is used for shale drilling well.

Description

A kind of drilling shale salt resistance leakproof drilling fluid
Technical field
The present invention relates to a kind of drilling shale salt resistance leakproof drilling fluids for shale gas exploitation, particularly suitable for fine fisssure Stitch the drilling of the long net horizontal section of shale of development.
Background technique
Now with the rise of unconventional energy resource shale gas at home, after the stock assessment of a new round shale gas by It confirms that there is extensive exploitation future in China, is that domestic petroleum resources are nervous at present for solution, realizes and produced in oil gas increasing the storage, guarantee The most important thing of national energy security, some key scientific problems around shale gas exploitation are also brought into schedule at the same time. Previous shale formation is studied as non-reservoir, but as the exploration and development of shale gas enters commercial mining substance rank Section, shale formation developed as main force's reservoir, the key area studied at present such as Sichuan-chongqing Region Longma small stream group with Bamboo Temple group reservoir is that Fissile Shale stratum is compared with traditional water sensitivity mud shale, and water-sensitive is weaker, sloughing mechanism It is biased, lead to occur filtrate intrusion when carrying out long horizontal well drilling, borehole wall generating period collapses, there is chronesthesy, This previous can accidentally be in the presence of that but becoming in shale gas drilling process can not keep away in big section mud cream rock straight well section The case where exempting from is horizontal well in addition, therefore its complexity is higher.
Oil base drilling fluid is mainly used during domestic shale gas horizontal well drilling, and most of from foreign enterprise, this is main Successful experience from the exploitation of U.S.'s shale gas, but the high cost of oil base drilling fluid, high pollution are its natural flaws, it can be by grinding Study carefully to obtain high performance imitative oil base water-base drilling fluid and make a breakthrough on novel nano drilling fluid worthy of expecting, compares oil base The advantage and disadvantage water-base drilling fluid advantage of drilling fluid has：1. environmental protection；2. natural gas leaching easily discovery；3. temperature convection denaturation influence compared with It is small；4. cost is relatively low；5. meeting leakage to be easily processed, disadvantage has：1. borehole wall stability is poor；2. thermal stability is relatively poor, It is easy to high temperature gel；3. resistance tocrocking poor (solid phase and CO2、H2S gaseous contamination), maintenance processing heavy workload；4. lubricating anti-sticking Scarce capacity.Therefore, develop it is a kind of can be suitably used for shale formation novel water-based drilling fluid substitution oil base drilling fluid be able to solve The problems such as wellbore stability, reservoir pollution is then the key technology of current shale gas drilling well, and the difficult point of shale drilling well both at home and abroad Place.
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, it is anti-to provide a kind of drilling shale salt resistance thus Leak drilling fluid.
In order to achieve the above object, the present invention uses following technical scheme：A kind of drilling shale salt resistance leakproof 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 8.5；It is close that drilling fluid is adjusted with barite It spends to 1.20g/cm3。
A kind of drilling shale of the present invention is with the preparation method of salt resistance leakproof drilling fluid：
It first measures 1000 grams of tap water and water temperature is risen to 80 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 drilling fluid is added under high speed 8000r/min electric stirring again and stirs 5min with macroemulsion EMP, in low speed 0.5-1 grams of emulsifier EM L-1 is added under 500r/min electric stirring and stirs 5min, the compound leak stopping of 10-15 grams of drilling fluid is added Agent FD-1 stirs 15min, and 0.15-1 grams of drilling fluid is added with anticalcium salt resistant filter loss reduction agent BDF-200L and stirs 10min；Then plus Enter 2-5 grams of highly-efficient lubricant for drilling fluid THN-1 stirring 10min, 5-10 grams of fluid loss additive for boring fluid DD-QK stirring is added 10min is added 10-20 grams of shale-control agent for drilling fluid LWJ-1 and stirs 5min, 8-10 drilling fluid compound leakage stop agent CD- is added FH-1 stirs 10min；Finally water is added to be configured to 40% lye with NaOH, regulation system pH is 8.5.It is added after stirring 30min Barite regulating density of drilling liquid is to 1.20g/cm3Stirring 1 hour, is made this drilling shale salt resistance leakproof drilling fluid.
Drilling fluid bentonite, Na used in above-mentioned preparation method2CO3, drilling fluid macroemulsion EMP, emulsifier EM L- 1, drilling fluid compound leakage stop agent FD-1, drilling fluid anticalcium salt resistant filter loss reduction agent BDF-200L, highly-efficient lubricant for drilling fluid THN-1, fluid loss additive for boring fluid DD-QK, shale-control agent for drilling fluid LWJ-1, drilling fluid compound leakage stop agent CD-FH-1, Barite, NaOH are to sell product in the market, are strictly examined by professional standard or enterprise's mark when purchasing, eligible could use. Specifically it is shown in Table 1.
1 drilling shale of table salt resistance leakproof drilling fluid base stock detail list
Drilling shale provided by the invention low density water base drilling fluid and current used shale drilling fluid system phase Than having the advantages that：1. this drilling fluid is small compared to oil base drilling fluid environmental pollution；2. having stronger inhibition to block energy Power；3. plugging material is environment-friendly materials；4. it is prominent that ability is invaded in salt resistance；5. cost is relatively low；6. meeting leakage to be easily processed.
Specific embodiment：
Below with reference to specific example, the present invention is further illustrated
Example 1：A kind of preparation method for creeping into shale salt resistance leakproof drilling fluid.
It first measures 1000 grams of tap water and water temperature is risen to 80 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 5 grams of drilling fluids are added under fast 8000r/min electric stirring and stir 5min with macroemulsion EMP, it is electronic in low speed 500r/min It is added with stirring 1 gram of emulsifier EM L-1 stirring 5min, 15 grams of drilling fluid compound leakage stop agent FD-1 stirring 15min are added, are added 1 gram of drilling fluid stirs 10min with anticalcium salt resistant filter loss reduction agent BDF-200L；Then 5 grams of highly-efficient lubricant for drilling fluid are added THN-1 stirs 10min, and 10 grams of fluid loss additive for boring fluid DD-QK stirring 10min are added, 20 grams of drilling fluids are added and are pressed down with shale Preparation LWJ-1 stirs 5min, and 10 drilling fluid compound leakage stop agent CD-FH-1 are added and stir 10min；Finally water is added to be configured to NaOH 40% lye, regulation system pH are 8.5.Barite regulating density of drilling liquid is added to 1.20g/cm after stirring 30min3Stirring 1 hour, this drilling shale salt resistance leakproof drilling fluid is made.This drilling shale salt resistance leakproof drilling fluid is made.
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 shale of table salt resistance leakproof drilling fluid system rolling rate of recovery experimental result
Drilling fluid composition Experiment condition It recycles quality (g) The rate of recovery (%)
Clear water+50g red beds soil 105℃/16h 5.00 10.00
Drilling fluid system+50g red beds soil 105℃/16h 48.24 96.48
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 shale of table salt resistance leakproof drilling fluid system linear expansion experimental result
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.
By table 2, the drilling shale of table 3 salt resistance leakproof drilling fluid rolling rate of recovery and linear expansion rate experiment it is found that Rolling rate of recovery reaches 95% or more, 16h linear expansion rate and only has 22.46% to have preferable inhibition aquation dispersion and expansion Property.

Claims (2)

1. a kind of drilling shale salt resistance leakproof drilling fluid, which is characterized in that the raw materials used component of the drilling fluid and content are：
It is made into the lye that mass percentage concentration is 40% with sodium hydroxide plus water, regulation system pH value is 8.5；It is aggravated with drilling fluid Agent barite aggravates system density to l.20g/cm3。
2. a kind of preparation method for creeping into shale salt resistance leakproof drilling fluid, which is characterized in that the preparation method includes following step Suddenly：It first measures 1000 grams of tap water and water temperature is risen to 80 DEG C, 30-50 grams of brill is added under low speed 500r/min electric stirring Well liquid bentonite stirs l0min, and 1.5-2.5 grams of Na is added2CO3It is stirred for 30min, prehydration is for 24 hours under normal temperature and pressure；Exist again 2-5 grams of drilling fluid is added under high speed 8000r/min electric stirring and stirs 5min with macroemulsion EMP, in low speed 500r/min 0.5-1 grams of emulsifier EM L-1 is added under electric stirring and stirs 5min, 10-15 grams of drilling fluid is added and is stirred with compound leakage stop agent FD-1 15min is mixed, 0.15-1 grams of drilling fluid is added with anticalcium salt resistant filter loss reduction agent BDF-200L and stirs l0min；Then 2-5 grams of brill is added Well liquid stirs l0min with highly-efficient lubricant THN-1, and 5-10 grams of fluid loss additive for boring fluid DD-QK is added and stirs l0min, is added 10-20 grams of shale-control agent for drilling fluid LWJ-1 stirs 5min, and 8-10 drilling fluid compound leakage stop agent CD-FH-1 stirring is added l0min；Finally water is added to be configured to 40% lye with NaOH, regulation system pH is 8.5；Barite tune is added after stirring 30min Drilling fluid density is saved to l.20g/cm3Stirring 1 hour.
CN201610517164.0A 2016-06-30 2016-06-30 A kind of drilling shale salt resistance leakproof drilling fluid Active CN105969325B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101979457A (en) * 2010-09-28 2011-02-23 中国石油化工集团公司 Seawater-based solid phase-free environment-friendly drilling and completion fluid
CN103937470A (en) * 2014-04-14 2014-07-23 中国石油化工集团公司 Water-based drilling fluid applicable to horizontal shale and preparation method thereof
CN104277803A (en) * 2014-09-05 2015-01-14 中国石油集团渤海钻探工程有限公司 KCl blocking and anti-sloughing drilling fluid and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101979457A (en) * 2010-09-28 2011-02-23 中国石油化工集团公司 Seawater-based solid phase-free environment-friendly drilling and completion fluid
CN103937470A (en) * 2014-04-14 2014-07-23 中国石油化工集团公司 Water-based drilling fluid applicable to horizontal shale and preparation method thereof
CN104277803A (en) * 2014-09-05 2015-01-14 中国石油集团渤海钻探工程有限公司 KCl blocking and anti-sloughing drilling fluid and preparation method thereof

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