CN1977027B - 滤饼的破坏方法 - Google Patents
滤饼的破坏方法 Download PDFInfo
- Publication number
- CN1977027B CN1977027B CN2005800165427A CN200580016542A CN1977027B CN 1977027 B CN1977027 B CN 1977027B CN 2005800165427 A CN2005800165427 A CN 2005800165427A CN 200580016542 A CN200580016542 A CN 200580016542A CN 1977027 B CN1977027 B CN 1977027B
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- Prior art keywords
- solid polymer
- drilling fluid
- polymer
- filter cake
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 81
- 230000008569 process Effects 0.000 title claims abstract description 14
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- 238000005553 drilling Methods 0.000 claims abstract description 116
- 239000012530 fluid Substances 0.000 claims abstract description 95
- 239000007787 solid Substances 0.000 claims abstract description 83
- 230000007062 hydrolysis Effects 0.000 claims abstract description 58
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
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- 239000000126 substance Substances 0.000 claims description 83
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- 102000004190 Enzymes Human genes 0.000 claims description 27
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- 239000004310 lactic acid Substances 0.000 claims description 17
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- RKDVKSZUMVYZHH-UHFFFAOYSA-N 1,4-dioxane-2,5-dione Chemical compound O=C1COC(=O)CO1 RKDVKSZUMVYZHH-UHFFFAOYSA-N 0.000 claims description 10
- 239000000178 monomer Substances 0.000 claims description 10
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- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 claims description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- JJTUDXZGHPGLLC-UHFFFAOYSA-N lactide Chemical compound CC1OC(=O)C(C)OC1=O JJTUDXZGHPGLLC-UHFFFAOYSA-N 0.000 claims description 7
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- 239000000835 fiber Substances 0.000 claims description 3
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- MWNQXXOSWHCCOZ-UHFFFAOYSA-L sodium;oxido carbonate Chemical compound [Na+].[O-]OC([O-])=O MWNQXXOSWHCCOZ-UHFFFAOYSA-L 0.000 claims description 3
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- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 2
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
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- 235000012204 lemonade/lime carbonate Nutrition 0.000 description 6
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- SESSOVUNEZQNBV-UHFFFAOYSA-M sodium;2-bromoacetate Chemical compound [Na+].[O-]C(=O)CBr SESSOVUNEZQNBV-UHFFFAOYSA-M 0.000 description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
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- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 4
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- 238000005520 cutting process Methods 0.000 description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 4
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- 102000004157 Hydrolases Human genes 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
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- 230000002378 acidificating effect Effects 0.000 description 2
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- 125000005587 carbonate group Chemical group 0.000 description 2
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 2
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- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 2
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- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
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- 241000196324 Embryophyta Species 0.000 description 1
- 102100031375 Endothelial lipase Human genes 0.000 description 1
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- 241000233866 Fungi Species 0.000 description 1
- SPAGIJMPHSUYSE-UHFFFAOYSA-N Magnesium peroxide Chemical compound [Mg+2].[O-][O-] SPAGIJMPHSUYSE-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 108091005804 Peptidases Proteins 0.000 description 1
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- 230000001588 bifunctional effect Effects 0.000 description 1
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- 159000000007 calcium salts Chemical class 0.000 description 1
- GJYLKIZKRHDRER-UHFFFAOYSA-N calcium;sulfuric acid Chemical compound [Ca].OS(O)(=O)=O GJYLKIZKRHDRER-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical group OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
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- 239000003814 drug Substances 0.000 description 1
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000003262 industrial enzyme Substances 0.000 description 1
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- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- YKLJGMBLPUQQOI-UHFFFAOYSA-M sodium;oxidooxy(oxo)borane Chemical compound [Na+].[O-]OB=O YKLJGMBLPUQQOI-UHFFFAOYSA-M 0.000 description 1
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- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- 150000007521 triprotic acids Chemical class 0.000 description 1
- AQLJVWUFPCUVLO-UHFFFAOYSA-N urea hydrogen peroxide Chemical compound OO.NC(N)=O AQLJVWUFPCUVLO-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- C09K8/03—Specific additives for general use in well-drilling compositions
-
- 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
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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
- C09K8/06—Clay-free compositions
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
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- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- C—CHEMISTRY; METALLURGY
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- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
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- C—CHEMISTRY; METALLURGY
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- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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- C—CHEMISTRY; METALLURGY
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- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/536—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning characterised by their form or by the form of their components, e.g. encapsulated material
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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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
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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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
- C09K8/57—Compositions based on water or polar solvents
- C09K8/575—Compositions based on water or polar solvents containing organic compounds
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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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
- C09K8/57—Compositions based on water or polar solvents
- C09K8/575—Compositions based on water or polar solvents containing organic compounds
- C09K8/5751—Macromolecular compounds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
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Abstract
一种在地下地层中产生自破坏滤饼的方法,所述方法包括:(a)将能够被水解转化成一种或多种有机酸的固体聚合物掺入到钻井液中;(b)使用所述钻井液向地下地层钻井筒,使得钻井液中的所述固体聚合物参与滤饼的形成;(c)让所述固体聚合物在水存在下发生水解,以破坏滤饼的完整性。还提供了含有一种或多种能够被水解转化成一种或多种有机酸的固体聚合物作为桥键形成剂的钻井液。
Description
本发明的方法主要适用于含烃和水的地下地层的钻井,烃或水随后可从地下地层生产出来。
在常规的地下地层钻井中,通常使用钻井液。一般将钻井液(也称钻井泥浆或钻井完井液(drill-in fluid))配制成使其向地层的滤失减至最低。这一般是通过向钻井液中掺入有助于滤饼形成的合适材料来实现。水基钻井液通常含有桥键形成剂(bridging agent)和填充剂(weightingagent)、至少一种作为增黏剂和降滤失添加剂(fluid loss additive)的聚合物如淀粉。合适的桥键形成剂包括但不限于重晶石、碳酸钙和白云石,它们也起到填充剂的作用。施胶盐也可与饱和盐溶液一起用作桥键形成剂(US 4,175,042)。通常,将一种或多种桥键形成剂与增黏剂如合适的生物聚合物组合使用。这和钻井过程中所产生的地层岩屑一起,导致在井筒的内面上形成滤饼。在滤饼的形成过程中,有钻井液向地层滤失,通常称为钻井液瞬时滤失(fluid spurt loss)。
在钻井后,可将井筒下套管和射孔,在这种情况下滤饼可被疏通。但是,有许多井,特别是水平井,尤其是长水平井保留为裸井,在生产区间中没有下套管和射孔。这种井在钻井后有滤饼衬着井筒的内面。钻井过程中产生的滤饼是一种地层损害,它虽然在钻井过程中是需要的,但会显著限制这种井的烃或水生产率,或者限制注入井的注入率。因此必须除去滤饼,以使生产或注入率最大化。
如果地层是高渗透地层,滤饼可通过高压力差(high drawdown)充分除去。但往往是,在低渗透地层或低压力差(low drawdown)地层中,必须应用能帮助除去滤饼的方法,以确保滤饼被除去。通常有必要应用化学处理来除去滤饼。用以除去滤饼的常规处理法包括使用氧化剂水溶液、盐酸溶液、有机酸溶液(包括甲酸或乙酸)、酸和氧化剂的组合以及酶水溶液。
对能在砾石充填后有效破坏滤饼的方法有特别的需求。成功的裸井砾石充填(“外部砾石充填”)要求完整滤饼的存在。但是,为得到可接受的生产率,在放置砾石后要求或需要有效地清除掉滤饼。
在其他类型的防砂完井中,例如在放置预填充筛网时,也需要有完整的滤饼,以防止钻井液滤失。同样,在放置筛网后也要求或需要有效地破坏掉滤饼,以得到可接受的生产率。
US 6,140,277和PCT/GB00/01032详述了会对常规的滤饼去除技术造成影响的问题。反应性液体如盐酸的有效放置非常困难,通常导致沿着井筒或其他目标地带进行的处理的效果相差很大。放置问题已通过能原位产生酸的方法而得到解决(US 5,678,632;PCT/GB00/01032)。
另一个问题是,滤饼常常由几种成分组成,通常不能通过单一的处理除去。例如,一些钻井泥浆或钻井完井液含有碳酸钙或白云石及与之组合的一种或多种能提供合适的流变学性能的聚合物。碳酸盐和聚合物都有助于滤饼的形成。在地层岩石的钻探过程中产生的岩屑也可能存在于滤饼中。
酸可用来溶解这种滤饼的碳酸盐成分,合适的聚合物破坏剂(breaker)如氧化剂或酶可用来分解滤饼中的聚合物。这些物质通常作为单独的处理手段来应用,因为酸和聚合物破坏剂常常不相容(参见US 6,140,277;PCT/GB00/01032)。
US 6,140,277教导了使用包含粘弹性表面活性剂、螯合剂和酶的配方来分解滤饼。
PCT/GB00/01032教导了使用包含能发生水解(任选使用酯水解酶)而原位产生有机酸的酯与氧化剂或酶聚合物破坏剂组合的配方,来处理包括滤饼在内的地层损害。
US 6,140,277和PCT/GB00/01032都涉及滤饼的单级处理,该处理能使碳酸盐溶解和使聚合物水解。这两种类型的处理均能获得非常好的区域覆盖度。
如果能获得这样的钻井液配方,其中滤饼在合理的一段时间(数天到数周)内基本降解,无须进行清除处理,这将避免需要进行单独的井清除处理工作。这还将克服这种处理中与放置反应性处理液体和获得良好区域覆盖度伴随产生的问题。这种滤饼可认为是自清除滤饼。
本发明的目标是提供这样的钻井液配方,即其产生的滤饼在钻井之后能完全或部分自清除。因此,本发明提供在地下地层中产生自破坏滤饼的方法,所述方法包括:
(a)将能够被水解转化成一种或多种有机酸的固体聚合物掺入到钻井液中;
(b)使用所述钻井液向地下地层钻井筒,使得钻井液中的所述固体聚合物参与滤饼的形成;
(c)让所述固体聚合物在水存在下发生水解,以破坏滤饼的完整性。
在本发明的方法中,将用以钻进会生产出烃和水的地层部分的钻井液(通常称为钻井完井液)配制成能获得可接受的钻井性能。用以钻井的液体其性能必需与其所需的功能一致。钻井液、钻井泥浆或钻井完井液的所需功能包括:控制地层压力;润滑钻柱;冷却钻头;在静态条件下使固形物悬浮;和将钻屑清除出井洞。
在本发明的方法中,还将钻井液组合物配制成包含选定的固体聚合物材料,其充当桥键形成剂并参与滤饼的积聚。
钻井液通常是水基钻井液,但也可以是油基钻井液,或者是基于合成化合物如液态酯的钻井液。这种钻井液是本领域技术人员公知的。
在本发明最基本的实施方案中,选择能在储油层温度下慢慢水解和分解的固体聚合物颗粒,将其掺入到用以钻进生产出烃和水的地层部分的钻井液中。在井的钻探过程中,聚合物颗粒与地层岩屑、增黏剂(包括生物聚合物,如果存在的话)和作为桥键形成剂或降滤失剂掺入到钻井液中的其他颗粒状材料一起,参与滤饼的生成。使用本发明方法的钻井作业包括本领域技术人员认为是钻井作业的所有方法,包括扩孔(under-reaming)。随后所述聚合物在水的存在下水解成水溶性单体或低聚物。通常聚合物会溶解产生一种或多种有机酸。聚合物的水解通过除去滤饼中至少一部分颗粒状物质,从而破坏滤饼的完整性。另外,如果滤饼含有酸溶性物质,如碳酸盐桥键形成剂和/或地层岩屑,聚合物水解所产生的酸将与至少一部分酸溶性物质发生反应,从而进一步破坏滤饼的完整性。如果地层是碳酸岩地层,聚合物水解所产生的酸也会与靠近滤饼的地层发生反应,帮助破坏滤饼。
固体聚合物水解的时间通常比钻进会生产出烃和水的地层部分所需的时间要长。通常这至少是数天时间,优选4天或更多天,尽管取决于钻井和完井所花费的时间,聚合物的水解花费更短或更长的时间也可能是合乎需要的。一般来说,滤饼在钻井结束前宜保持完整。在钻井结束时钻井液往往被顶替成无固相液(solids free fluid),通常是含水液体。滤饼的完整性宜在钻井液被顶替成无固相液之后才被大量破坏,使得钻井液向地层的滤失减至最低。
用于本发明方法中的聚合物是能在水的存在下水解产生一种或多种有机酸的任何固体聚合物。优选所述聚合物是聚酯,特别是脂肪族聚酯。最优选所述聚酯选自能通过本领域技术人员公知的合适方法合成的聚酯,所述合适方法包括丙交酯(乳酸环二聚体)、乙交酯(乙醇酸环二聚体)和己内酯的开环熔体缩合。合适的聚合物包括掺入了丙交酯、乙交酯或己内酯(还掺入或不掺入其他单体)的聚合物。具体的实例包括聚丙交酯(聚乳酸)、聚乙交酯(聚乙醇酸)、丙交酯-乙交酯共聚物、丙交酯-己内酯共聚物、乙交酯-己内酯共聚物和丙交酯-乙交酯-己内酯共聚物。合适的聚合物还包括乳酸和羟基乙酸(乙醇酸)的均聚物或共聚物,以及乳酸和/或乙醇酸与一种或多种含有羟基、羧酸或羟基羧酸部分的其他化合物的共聚物。US 4,986,353提供了可与乳酸或乙醇酸缩合的合适单体的实例。合适的单体包括但不限于三元酸如柠檬酸、二元酸如己二酸、以及二醇如乙二醇和多元醇。它们还包括双官能分子如2,2-(二羟基甲基)丙酸。根据US 4,986,353的方法的优选共缩合分子是柠檬酸、2,2-(二羟基甲基)丙酸、三羟甲基乙烷和己二酸。
这些单体或其他任何单体也可掺入到根据本发明方法的聚合物中,只要固体聚合物能在水的存在下发生水解产生一种或多种有机酸。酸的产生是由于聚酯中的酯键发生简单水解。
优选能水解产生乳酸和/或乙醇酸的聚合物。特别优选的聚合物选自能通过乳酸、乙醇酸、丙交酯(乳酸的二聚体)、乙交酯(乙醇酸的二聚体)和己内酯的缩合合成的脂肪族聚酯。其中通过缩合掺入了乳酸的聚合物水解时产生乳酸,其中通过缩合掺入了乙醇酸的聚合物水解时产生乙醇酸。
聚合物或共聚物的组成是聚合物水解速度的主要决定因素。通常选择能在被处理地层的温度条件下产生所需水解速度的组成。在钻出了井并将钻井液顶替成无固相液之后,通常将井关闭一段时间,这段时间足以让聚合物发生水解而破坏滤饼的完整性。然后再将井投入生产(或者在注入井的情况下投入注入作业)。
聚合物的水解是通过整体浸蚀(bulk erosion)进行的(BiodegradablePolymers as Drug Delivery Systems,Mark Chasin和Robert Langer(编辑).Marcel Dekker Inc.,New York,Basel and Hong Kong,1990)。
水解速度主要受四个关键变量的影响:单体的立体化学组成(D型或L型)、共聚单体的比例、聚合物链的线性度和聚合物的分子量。水解是在聚合物的表面上发生的,因此对于特定的聚合物组成,聚合物的颗粒大小也是水解和酸生成速度的主要决定因素。
特定组成的聚合物颗粒越小,在特定温度下每单位重量的表面积就越大,因此生成酸的速度越快。一般来说,聚乳酸和其他富含乳酸的聚合物的降解速度比聚乙醇酸和其他富含乙醇酸的聚合物要慢,通常优选用于本发明方法中。
如果需要,将己内酯掺入到聚合物中能提高聚合物的水解速度。聚合物的水解速度还可能受共聚物中嵌段或无规结构的程度、聚合物端基的化学修饰或者聚合物中支化的引入(例如通过将多元醇掺入到聚合物中)的影响。
解聚速度也可能通过向聚酯中掺入特定的化学品如季铵化合物来提高(US 5,278,256)。
水解相对较快的聚合物组合物包括聚乙醇酸和聚合物组成单体中乙醇酸占50%以上直至100%的聚合物。水解相对较慢的聚合物组合物包括聚乳酸和聚合物组成单体中乳酸占50%以上直至100%的聚合物。在低温下,例如20℃-100℃下,往往将富含乙醇酸(即含量50%以上)的聚合物用于本发明方法中。在较高温度下,例如约80°-170℃下,则往往使用富含乳酸(即含量50%以上)的聚合物。
通过选择适当的聚合物组成和固体聚合物呈现形式(固体的大小和形状),可确定有机酸的类型、所释放的酸量和特定温度下酸生成的速度。
聚合物水解所产生的酸可与滤饼或邻近地层中存在的酸溶性物质如碳酸钙或白云石反应。优选地,聚合物水解所产生的有机酸与碳酸钙反应形成钙盐,其在地层温度下水溶解度达至少几个百分比。乳酸和乙醇酸是合适的酸。
由于酸的产生要经过一段时间,因此可在产生出大部分的酸之前将固体聚合物掺入到滤饼中。聚合物通常存在于用以钻穿生产区间的全部钻井液中,因此将存在于滤饼的整体中。
聚合物可以以任何固体形状来使用,包括但不限于球体、圆柱体、长方体、纤维、粉末、珠粒或者其他任何能被引入到地层中的形状。它优选以颗粒形状使用,大小范围在1微米至2mm,最优选5微米至100微米。
所需大小和形状的聚合物可通过本领域技术人员公知的任何合适方法制备,包括但不限于聚合物熔体的高剪切分散、乳化后再溶剂蒸发、去溶剂化、喷雾干燥或研磨。一些用以生产微颗粒、微球体、微胶囊、成形颗粒(shaped particle)和纤维的合适方法在Chasin,M和Langer,R.(编辑).Biodegradable Polymers as Drug Delivry Systems.Marcel Dekker Inc.,New York,(1990)中有综述。US 4,986,355教导了制备适当施胶的聚酯颗粒的方法,所述聚酯颗粒在地下地层中用作降滤失添加剂或凝胶破坏剂。
一般来说,在基于溶剂的用以生产所需大小和形状的颗粒的方法中宜避免使用氯化溶剂。例如,二氯甲烷已被用于生产供在药物递送应用中使用的聚酯(如聚丙交酯)的微颗粒,但微颗粒即使在干燥后也可能仍有大量的二氯甲烷存在。氯化溶剂的存在会降低聚酯本应优越的环境可接受性。聚酯在非氯化溶剂中的溶解度通常有限。
在本发明的其他实施方案中,还可任选将聚合物破坏剂引入到井筒中,以通过攻击滤饼中存在的任何生物聚合物或其他增黏或防滤失聚合物来帮助破坏滤饼。可将聚合物破坏剂引入到钻井液中和/或引入到固体聚合物本身中,但优选引入到无固相液(其被引入到井筒中以顶替钻井液)中。如本领域技术人员所公知,聚合物破坏剂可溶解于或分散于钻井液、固体聚合物或无固相液中,或者可以以任何缓释或控释配方的形式存在,包括聚合物破坏剂的包囊化形式。
本发明的优选聚合物破坏剂是氧化性破坏剂(氧化剂)和酶破坏剂,不过也可使用其他任何能够至少部分降解增黏或防滤失聚合物的破坏剂。
用于本发明方法中的氧化性破坏剂可以是本领域技术人员公知的任何一种氧化性破坏剂,其用于与增黏或防滤失聚合物(在了大多数情况下是多糖生物聚合物)反应,以降低含聚合物的组合物的粘度或者破坏含聚合物的滤饼。氧化性破坏剂可存在于溶液中,或者作为分散体存在。合适的化合物包括过氧化物、过硫酸盐、过硼酸盐、过碳酸盐、过磷酸盐、次氯酸盐、过硅酸盐和过氧化氢加合物如脲过氧化氢和过氧化镁。它们通常至少以本领域技术人员公知有效的浓度使用。
优选的掺入到钻井液中、掺入到被引入到井筒中以顶替钻井液的液体(包括无固相液)中或者掺入到根据本发明方法的固体聚合物中的氧化性破坏剂,是能分解产生过氧化氢的过氧化物。在氧化性破坏剂当中最优选的是过碳酸盐和过硼酸盐,尤其是过碳酸钠和过硼酸钠。
优选用于本发明方法中的酶破坏剂包括本领域公知可用于水解增黏或防滤失聚合物,从而降低降低含聚合物的组合物的粘度或者破坏含聚合物的滤饼的酶类。酶破坏剂要根据它们已知的水解增黏聚合物的能力来选择。增黏聚合物通常是多糖,因此酶破坏剂要根据它们已知的水解滤饼中多糖成分的能力来选择。可用来分解多糖的合适酶类的实例包括能水解淀粉、黄原胶、纤维素、瓜尔胶、小核菌葡聚糖、琥珀酰聚糖或者这些聚合物的衍生物的酶类。
在本发明的一些实施方案中,掺入的氧化性破坏剂的有效性可通过产生更多的反应性氧化剂来增强。在某些情况下,例如当引入了过氧化物时,在有机酸存在下过氧化氢的产生可导致形成过酸,这是比过氧化氢更为有效的氧化剂。酯在过氧化氢存在下的水解也可能导致产生过酸。已知酯在过氧化氢或其他过氧化物存在下能被水解酶(EC3)如脂肪酶(EC 3.1.1.3)、酯酶(EC 3.1.1.1)或蛋白酶(EC 3.4)水解形成过酸(US 3,974,082;US 5,108,457;US 5,296,161;US 5,338,474;US5,352,594;US 5,364,554)。这种酶所原位产生的过酸已被用于漂白应用中。过酸是比过氧化物更为有效的氧化剂,特别是在25-80℃的温度下。因此,可将酯、酯水解酶、过氧化氢或产过氧化氢化合物掺入到钻井液中,掺入到被引入到井筒中以顶替钻井液的无固相液中,或者掺入到本发明的固体聚合物中。聚酯在过氧化氢存在下的水解也预期能产生过酸。
在本发明的一些实施方案中,宜使用不只一种类型的聚合物破坏剂,例如在有两种多糖存在、但只有一种多糖易受酶攻击的情况下,可将氧化剂与酶破坏剂组合使用。
如果需要,固体聚合物可通过溶解、分散或包囊化而包含其他物质。所述其他物质可包括聚合物破坏剂。固体聚合物的水解会释放出聚合物破坏剂或其他加入的物质。在聚合物破坏剂包囊在聚合物中的情况下,其释放通常是在固体聚合物的水解和酸的产生之后发生,而对于溶解或分散的物质,其释放与酸的产生同时发生。加入的物质的一个功能是将固体聚合物的比重调整至为掺入到钻井液中所需的比重值。用以调整比重的优选物质包括水溶性碱金属盐和其他另外用于调整油田盐水比重的盐。所述其他物质还可包括过氧化钙和氟化氢铵。在所述其他物质为水溶性物质的情况下,这些水溶性的其他物质的分解与固体聚合物水解一致,将在相对于水溶性物质来说欠饱和盐水的存在下出现。这会导致滤饼进一步被破坏。
由于固体聚合物的水解产生了酸,可便利地将能与酸反应产生合乎需要的氧化剂的化学品或者用以处理地下地层的其他化学品,掺入到一种或多种钻井液中、掺入到被引入到井筒中以顶替钻井液的液体中,或者掺入到根据本发明方法的固体聚合物中。合适化学品的实例是过氧化钙和氟化氢铵。过氧化钙在酸的存在下分解形成过氧化氢,氟化氢铵在酸的存在下则分解形成氟化氢。过氧化氢或氟化氢的原位产生可进一步帮助破坏滤饼。氟化氢的产生使难溶于有机酸溶液的物质,如钻井过程中产生的硅酸盐或粘土细屑、钻井泥浆中存在的硅酸盐或粘土(例如膨润土或蒙脱石)或者地层(例如靠近井筒的砂岩地层)中存在的硅酸盐或粘土得以溶解。在本发明的方法中氟化氢的产生可帮助破坏含有可被氟化氢溶解的物质的滤饼,或者破坏靠近含有可被氟化氢溶解的物质的地层的滤饼。
乙醇酸可溶解硫酸钙。固体聚合物水解所产生的乙醇酸,或者直接引入到井筒中的乙醇酸,能有效除去硫酸钙,以便如果需要的话将硫酸钙用作钻井液中的桥键形成剂。固体聚合物水解所产生的乙醇酸也可有效溶解钻井液与地层液体之间的反应所产生的任何硫酸钙。固体聚合物水解所能产生且可溶解其他矿物桥键形成剂或结垢的其他螯合酸,对于本领域技术人员来说是显而易见的。
可将不只一种固体聚合物与或不与包囊化、溶解或分散的聚合物破坏剂一起同时引入到地层中。固体聚合物的最终完全溶解获得理想的清除性能。
本发明方法所需的所有化学品通常属工业级,以降低此方法的成本。
在根据本发明方法将酶用作聚合物破坏剂的情况下,有必要选择这样的酶,即其在储油层条件下和在处理液体中保持活性的时间至少与催化活性所需要的时间一样长。
酶通常是水溶性酶。尽管酶在低水活度环境或两相体系(如乳状液或分散体)中也可有活性和加以使用,但酶易溶于水通常是有利的。通常使用分离的酶。酶可从植物、动物、细菌或真菌来源分离。酶可从野生型的、常规培育的、突变的或遗传工程改造的生物体生产。酶还任选进行化学修饰,只要它们保持或拥有所需的催化能力。优选酶是能从商业来源大量获得的工业用酶。
虽然大部分的酸是在滤饼形成之后由固体聚合物的水解生成的,但钻井液中存在的由钻井过程中固体聚合物水解产生的痕量酸可能会潜在地导致滤饼的酸溶性部分过早溶解。这种情况可通过向本发明的钻井液中掺入合适量的碱或缓冲液来避免,所述碱或缓冲液能将pH保持在高于滤饼会发生腐蚀的pH水平,持续至少在有烃或水的地层中钻井筒所需的一段时间。
类似地,由于聚合物破坏剂攻击滤饼而造成的滤饼过早溶解问题,也可通过使用如本领域技术人员所公知的聚合物破坏剂控释制品来解决,所述制品包括但不限于其中聚合物破坏剂通过包囊化、溶解或分散掺入到固体聚合物中的制品。但通常来说,聚合物破坏剂不存在于钻井液中,因为它们否则会使粘度降低至所需值以下。优选在用以顶替钻井液的无固相液中将一种或多种聚合物破坏剂引入到井筒中。聚合物破坏剂的存在量足以帮助进一步破坏滤饼(因滤饼中存在的聚合物降解而造成)。这种破坏是固体聚合物溶解和滤饼中存在的任何酸溶性物质溶解造成的破坏之外的破坏作用。
根据本发明方法的滤饼破坏手段可任选与聚合物破坏剂之外的常规滤饼破坏剂组合使用。这些破坏剂是本领域技术人员公知的,包括酸、能产生酸的组合(如酯和酯水解酶)以及螯合剂。可方便地将这些化学处理方法的各成分包含在用以从井筒顶替钻井液的液体中。
钻井液和用以顶替钻井液的无固相液可通过本领域技术人员公知的制备这种液体的任何方法来制备。这些液体通常只用来钻穿生产区间。其他钻井液可用来钻穿其他区域。
本发明进一步提供适合用于向地下地层钻井的钻井液,其含有一种或多种作为桥键形成剂的固体聚合物,所述固体聚合物能够被水解转化成一种或多种有机酸。该或每种(the or each)固体聚合物可如以上涉及本发明方法的定义。优选固体聚合物是聚酯。
固体聚合物在钻井液中的存在量决定于钻井液的所需特性和钻井液的其他成分的量。通常,选定的配方所导致的滤饼含有足够的固体聚合物,使得当固体聚合物水解时,该配方会造成滤饼被充分破坏(滤饼的破坏单独发生,或者与滤饼中的酸溶性物质的溶解和/或滤饼中的聚合物的降解(如果聚合物破坏剂已经存在的话)一起发生),以使地层渗透性提高,优选基本恢复至钻井前所存在的渗透性。
通常,所用的固体聚合物体积能替换全部或部分体积的通常存在于钻井液中的颗粒状物质。通常,钻井液中存在最多约60%重量的固体物质,这可为最多约20%体积。因此,可将约1%-25%、优选约5-20%体积的固体聚合物掺入到本发明方法的钻井液中。
在将聚合物破坏剂掺入到本发明方法的液体中的情况下,它们的掺入浓度足以有助于破坏滤饼。酶聚合物破坏剂通常是以0.05%-5%v/v商用液体制品或相当量的干酶制品使用。氧化性聚合物破坏剂的用量取决于所用破坏剂的类型,不过大约为0.005-60Kg/m3,优选0.2-10Kg/m3。如果将聚合物破坏剂掺入到固体聚合物中,它们的掺入浓度也要足以有助于破坏滤饼。
通常,钻井液和用以顶替钻井液的无固相液是含水的。但是固体聚合物也可掺入到烃基钻井液中。滤饼的溶解需要水的存在。在从烃基液体顶替成水基液体时,要注意避免乳状液的形成。进行液体顶替操作时潜在的问题和克服这些问题的方法是本领域技术人员公知的。
本发明与现有技术相比具有以下特别优势:
用本发明的钻井液配方钻井能产生自清除滤饼。所述钻井液配方的危险性低。本发明方法可沿着整个生产区间破坏滤饼,区域覆盖度良好。不需要使用常规的基于酸的清除方法,这在操作上和在健康、安全方面具有优势。通过用本发明的钻井液配方钻井,并顶替成含有聚合物破坏剂的无固相液,可以简单方便地破坏含有碳酸盐和聚合物的滤饼。在进行砾石充填和其他防砂完井之后,可不用将处理化学品掺入到砾石充填液体或者随后进行砾石充填井的处理,就实现滤饼的破坏。钻井液体系的各成分通常是环境可接受的。用以除去滤饼的液体不是高腐蚀性的。因此通常不需要使用腐蚀抑制剂,这对环境又是另外的好处。
本发明通过以下实施例做进一步的说明:
实施例1
将1g聚乙醇酸粉末加入到装有10ml水和2g碳酸钙(平均颗粒大小50微米)的50ml管中。将管封盖,在25℃、60℃和80℃下保温。采集含水液体样品,离心分离颗粒状物质,用比色测定法分析可溶性钙,以监测碳酸钙溶解情况(由于聚乙醇酸水解释放的乙醇酸所致)。
在25℃、60℃和80℃下24小时后的碳酸钙溶解量分别为6、20和40g/l。
实施例2
将1g聚乳酸颗粒(平均直径2.5mm)加入到装有10ml水和2g碳酸钙(平均颗粒大小50微米)的50ml管中。将管封盖,在80℃和95℃下保温。采集含水液体样品,离心分离颗粒状物质,用比色测定法分析可溶性钙,以监测碳酸钙溶解情况(由于聚乳酸水解释放的乳酸所致)。
在80℃和95℃下24小时后的碳酸钙溶解量分别为2.5和12.4g/l。
实施例3
将1.000g磨细的聚乳酸(平均直径400微米)加入到75ml去离子水中,放在Ofite高压高温(HPHT)槽(cell)中。将槽密封,加热至121℃。大约23小时、48小时或69小时(三次单独运行)之后,开槽,收集任何未溶解物质,风干至恒重。然后测定溶解的起始PLA的百分比。
121℃下的时间(小时) | 溶解的PLA的百分比 | 溶液的pH(pH试纸条测出) |
0 | 0 | |
23 | 60 | 3 |
48 | 98 | 2* |
69 | 100 | 2 |
(*2.85,pH计测出)
这些结果表明,在121℃下水解需要进行几十个小时。pH低表明乳酸伴随聚乳酸的水解而产生。
以上实施例证明,聚乙醇酸和聚乳酸与水接触时发生水解。碳酸钙被固体聚合物水解所产生的酸溶解。这些实施例进一步证明,酸生成速度是聚合物组成和温度的函数。滤饼中存在的聚酯聚合物的水解会导致滤饼被破坏。伴随的有机酸生成将进一步帮助破坏含碳酸盐的滤饼和与碳酸盐地层接触的滤饼。
Claims (38)
1.一种在地下地层中产生自破坏滤饼的方法,所述方法包括:
(a)将(i)能够被水解转化成一种或多种有机酸的固体聚合物和(ii)增黏剂掺入到钻井液中;
(b)使用所述钻井液向地下地层钻一个井筒,使得钻井液中的所述固体聚合物参与滤饼的形成;
(c)让所述固体聚合物在水存在下发生水解,以破坏滤饼的完整性。
2.权利要求1的方法,其中所述固体聚合物是聚酯。
3.权利要求1或2的方法,其中所述固体聚合物是脂肪族聚酯。
4.权利要求1或2的方法,其中所述固体聚合物是掺入了丙交酯、乙交酯或己内酯的聚合物。
5.权利要求1或2的方法,其中所述固体聚合物是掺入了与丙交酯、乙交酯或己内酯一起的其他单体的聚合物。
6.权利要求1或2的方法,其中所述固体聚合物是聚丙交酯、聚乙交酯、丙交酯-乙交酯共聚物、丙交酯-己内酯共聚物、乙交酯-己内酯共聚物或丙交酯-乙交酯-己内酯共聚物。
7.权利要求1或2的方法,其中所述固体聚合物是水解时产生一种或多种有机酸的聚合物。
8.权利要求1或2的方法,其中所述固体聚合物是水解时产生乳酸或乙醇酸的聚合物。
9.权利要求1或2的方法,其中所述固体聚合物为球体、圆柱体、长方体、纤维、粉末或珠粒的形状或者其他形状。
10.权利要求1或2的方法,其中固体聚合物水解所产生的所述酸溶解滤饼或邻近地层中存在的酸溶性物质。
11.权利要求1或2的方法,其中所述钻井液包含1-25%v/v的固体聚合物。
12.权利要求1的方法,其中所述钻井液还包含聚合物破坏剂,或者所述固体聚合物还包含聚合物破坏剂。
13.权利要求1的方法,其中所述方法进一步包括用包含聚合物破坏剂的液体顶替钻井液。
14.权利要求12的方法,其中所述聚合物破坏剂是水解酶。
15.权利要求12的方法,其中所述聚合物破坏剂是多糖水解酶。
16.权利要求12的方法,其中所述聚合物破坏剂是能水解淀粉、黄原胶、纤维素、瓜尔胶、小核菌葡聚糖或琥珀酰聚糖或者任一种这些聚合物的衍生物的酶。
17.权利要求12的方法,其中所述聚合物破坏剂是氧化剂。
18.权利要求17的方法,其中所述聚合物破坏剂是选自过硫酸盐、次氯酸盐、过氧化物、过硼酸盐、过碳酸盐、过磷酸盐和过硅酸盐的氧化剂。
19.权利要求18的方法,其中所述过氧化物是过氧化氢加合物。
20.权利要求12-19中任一项的方法,其中所述聚合物破坏剂为缓释制品的形式。
21.权利要求12-19中任一项的方法,其中该或每种聚合物破坏剂掺入到固体聚合物中(a)通过包囊化来进行,以使它或它们的控制释放在酸生成的同时或者之后发生,或者(b)通过溶解或分散来进行,以使它或它们的控制释放在酸生成的同时发生。
22.权利要求1或2的方法,其中所述固体聚合物或钻井液和随后的滤饼还包含过氧化钙,且其中所述固体聚合物水解所产生的酸导致过氧化氢的产生。
23.权利要求1或2的方法,其中所述固体聚合物或钻井液还包含氟化氢铵,且其中所述固体聚合物水解所产生的酸导致氟化氢的产生。
24.权利要求1或2的方法,其中所述钻井液还包含硫酸钙作为桥键形成剂。
25.权利要求12-19中任一项的方法,其中所述聚合物破坏剂的存在量足以进一步破坏滤饼的完整性。
26.权利要求1或2的方法,其中所述地下地层含有烃或水,且其中所述方法进一步包括从被处理地层回收烃或水。
27.权利要求1或2的方法,其中所述固体聚合物还包含一种或多种通过溶解、分散或包囊化掺入到固体聚合物中的其他物质。
28.权利要求27的方法,其中所述一种或多种其他物质选自聚合物破坏剂、比重调整物质、过氧化钙和氟化氢铵。
29.一种适合用于向地下地层中钻井的钻井液,所述钻井液含有作为桥键形成剂的一种或多种能够被水解转化成一种或多种有机酸的固体聚合物,以及增黏剂。
30.权利要求29的钻井液,其中所述固体聚合物是聚酯。
31.权利要求29的钻井液,其中该或每种固体聚合物是脂肪族聚酯。
32.权利要求29的钻井液,其中所述固体聚合物是掺入了丙交酯、乙交酯或己内酯的聚合物。
33.权利要求29的钻井液,其中所述固体聚合物是掺入了与丙交酯、乙交酯或己内酯一起的其他单体的聚合物。
34.权利要求29的钻井液,其中所述固体聚合物是聚丙交酯、聚乙交酯、丙交酯-乙交酯共聚物、丙交酯-己内酯共聚物、乙交酯-己内酯共聚物或丙交酯-乙交酯-己内酯共聚物。
35.权利要求29的钻井液,其中所述固体聚合物是水解时产生一种或多种有机酸的聚合物。
36.权利要求29的钻井液,其中所述固体聚合物是水解时产生乳酸或乙醇酸的聚合物。
37.权利要求29-31中任一项的钻井液,其中所述固体聚合物在水的存在下发生水解,破坏掺入所述固体聚合物的滤饼。
38.权利要求37的钻井液,其中所述固体聚合物水解所产生的酸进一步通过与滤饼或邻近地层中存在的酸溶性物质反应来破坏滤饼。
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GB0406998.5 | 2004-03-27 | ||
GB0406998A GB2412391A (en) | 2004-03-27 | 2004-03-27 | Process for disruption of filter cakes |
PCT/GB2005/001193 WO2005095538A1 (en) | 2004-03-27 | 2005-03-24 | Process for disruption of filter cakes |
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CN (1) | CN1977027B (zh) |
BR (1) | BRPI0509303B1 (zh) |
CA (1) | CA2560939C (zh) |
GB (3) | GB2412391A (zh) |
NO (1) | NO344548B1 (zh) |
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CN105273702A (zh) * | 2014-07-17 | 2016-01-27 | 天津大港油田钻采技术开发公司 | 无固相防硫化氢低伤害洗井液及其制备方法 |
CN105273702B (zh) * | 2014-07-17 | 2018-06-15 | 天津大港油田石油工程研究院钻采技术开发有限公司 | 无固相防硫化氢低伤害洗井液及其制备方法 |
CN104449621A (zh) * | 2014-12-18 | 2015-03-25 | 中国石油大学(华东) | 一种高效固井冲洗液体系 |
CN104449621B (zh) * | 2014-12-18 | 2017-06-06 | 中国石油大学(华东) | 一种高效固井冲洗液体系 |
CN109694701A (zh) * | 2017-10-20 | 2019-04-30 | 湖北汉科新技术股份有限公司 | 一种暂堵修井液及其暂堵剂、制备和使用方法 |
CN109694701B (zh) * | 2017-10-20 | 2021-04-23 | 湖北汉科新技术股份有限公司 | 一种暂堵修井液及其暂堵剂、制备和使用方法 |
Also Published As
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CA2560939A1 (en) | 2005-10-13 |
NO344548B1 (no) | 2020-01-27 |
GB2412391A (en) | 2005-09-28 |
RU2373250C2 (ru) | 2009-11-20 |
GB0406998D0 (en) | 2004-04-28 |
BRPI0509303A (pt) | 2007-09-04 |
GB0813702D0 (en) | 2008-09-03 |
US20070204997A1 (en) | 2007-09-06 |
CN1977027A (zh) | 2007-06-06 |
US7935660B2 (en) | 2011-05-03 |
CA2560939C (en) | 2012-07-03 |
GB2429735B (en) | 2008-12-10 |
GB2429735A (en) | 2007-03-07 |
GB0620936D0 (en) | 2006-12-13 |
RU2006137842A (ru) | 2008-05-10 |
BRPI0509303B1 (pt) | 2019-04-24 |
GB2448840B (en) | 2009-03-18 |
GB2448840A (en) | 2008-10-29 |
NO20064879L (no) | 2006-10-26 |
WO2005095538A1 (en) | 2005-10-13 |
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