CN115181557A - Oil-displacing type flushing spacer fluid and preparation method thereof - Google Patents
Oil-displacing type flushing spacer fluid and preparation method thereof Download PDFInfo
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- CN115181557A CN115181557A CN202110361523.9A CN202110361523A CN115181557A CN 115181557 A CN115181557 A CN 115181557A CN 202110361523 A CN202110361523 A CN 202110361523A CN 115181557 A CN115181557 A CN 115181557A
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- spacer fluid
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- type flushing
- flushing spacer
- oil displacement
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- 239000012530 fluid Substances 0.000 title claims abstract description 124
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 102
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 93
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000006073 displacement reaction Methods 0.000 claims abstract description 67
- 239000004094 surface-active agent Substances 0.000 claims abstract description 34
- 239000002270 dispersing agent Substances 0.000 claims abstract description 33
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 27
- 239000000725 suspension Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 239000003381 stabilizer Substances 0.000 claims abstract description 25
- 239000011259 mixed solution Substances 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 30
- 239000004568 cement Substances 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 17
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 16
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 16
- -1 polydimethylsiloxane Polymers 0.000 claims description 15
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 14
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 13
- PYIDGJJWBIBVIA-UYTYNIKBSA-N lauryl glucoside Chemical compound CCCCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O PYIDGJJWBIBVIA-UYTYNIKBSA-N 0.000 claims description 13
- 229940048848 lauryl glucoside Drugs 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 12
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 10
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 10
- 239000001913 cellulose Substances 0.000 claims description 10
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 10
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 10
- GOJYXPWOUJYXJC-UHFFFAOYSA-M sodium;2-[1-(2-hydroxyethyl)-2-undecyl-4,5-dihydroimidazol-1-ium-1-yl]acetate;hydroxide Chemical compound [OH-].[Na+].CCCCCCCCCCCC1=NCC[N+]1(CCO)CC([O-])=O GOJYXPWOUJYXJC-UHFFFAOYSA-M 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000003129 oil well Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- 229920006184 cellulose methylcellulose Polymers 0.000 claims description 7
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 7
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 7
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 6
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 5
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 5
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 5
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 5
- 239000000661 sodium alginate Substances 0.000 claims description 5
- 235000010413 sodium alginate Nutrition 0.000 claims description 5
- 229940005550 sodium alginate Drugs 0.000 claims description 5
- 239000013530 defoamer Substances 0.000 claims description 4
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 229910052949 galena Inorganic materials 0.000 claims description 3
- XCAUINMIESBTBL-UHFFFAOYSA-N lead(ii) sulfide Chemical compound [Pb]=S XCAUINMIESBTBL-UHFFFAOYSA-N 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 3
- 150000002191 fatty alcohols Chemical class 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 11
- 238000005553 drilling Methods 0.000 description 29
- 239000002002 slurry Substances 0.000 description 26
- 239000007789 gas Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011268 mixed slurry Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000010428 baryte Substances 0.000 description 2
- 229910052601 baryte Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 125000000400 lauroyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000001632 sodium acetate Substances 0.000 description 2
- 235000017281 sodium acetate Nutrition 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- CYEJMVLDXAUOPN-UHFFFAOYSA-N 2-dodecylphenol Chemical compound CCCCCCCCCCCCC1=CC=CC=C1O CYEJMVLDXAUOPN-UHFFFAOYSA-N 0.000 description 1
- IMCAQSSWXZDVKX-UHFFFAOYSA-N C(C1=CC=CC=C1)S(=O)(=O)OCCCCCCCCCCCCCCCCCC.[Na] Chemical compound C(C1=CC=CC=C1)S(=O)(=O)OCCCCCCCCCCCCCCCCCC.[Na] IMCAQSSWXZDVKX-UHFFFAOYSA-N 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000003042 antagnostic effect Effects 0.000 description 1
- CZBZUDVBLSSABA-UHFFFAOYSA-N butylated hydroxyanisole Chemical compound COC1=CC=C(O)C(C(C)(C)C)=C1.COC1=CC=C(O)C=C1C(C)(C)C CZBZUDVBLSSABA-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- DVEKCXOJTLDBFE-UHFFFAOYSA-N n-dodecyl-n,n-dimethylglycinate Chemical compound CCCCCCCCCCCC[N+](C)(C)CC([O-])=O DVEKCXOJTLDBFE-UHFFFAOYSA-N 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000344 non-irritating Toxicity 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229920005552 sodium lignosulfonate Polymers 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012430 stability testing Methods 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
- C09K8/40—Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/424—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells using "spacer" 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing 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
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an oil displacement type flushing spacer fluid and a preparation method thereof, belonging to the field of petrochemical industry, and the oil displacement type flushing spacer fluid comprises the following components in parts by weight: 200 parts of water; 6-12 parts of a surfactant; 0.2 to 1.0 portion of suspension stabilizer; 0.3 to 1.5 portions of tackifier; 0.4-3.0 parts of a dispersant; 30-350 parts of weighting agent; 0.1 to 0.2 portion of defoaming agent. The oil displacement type flushing spacer fluid has good high temperature resistance, compatibility and stability, the cleaning efficiency is higher than 90%, and the oil displacement effect is excellent.
Description
Technical Field
The invention relates to the field of petrochemical industry, in particular to an oil displacement type flushing spacer fluid and a preparation method thereof.
Background
The shale gas refers to unconventional natural gas existing in the organic matter-rich shale and the interlayer thereof, and because the shale stratum in which the shale gas is located has the characteristics of hard and brittle lithology, easy expansion, easy breaking, strong water sensitivity and the like, the oil-based drilling fluid is generally adopted in the drilling process of the shale gas well. Although the oil-based drilling fluid can meet the drilling requirement of the shale gas reservoir, the oil-based drilling fluid is easy to remain on the surfaces of a well wall and a casing wall, and the oil-based drilling fluid has extremely poor compatibility with well cementation cement slurry, so that adverse effects are brought to the well cementation operation of the shale gas horizontal well, namely the casing wall and the well wall are in the oil-based drilling fluid environment for a long time, two interfaces are oleophilic and hydrophobic, and the interface cementation quality is influenced. When the well cementation cement slurry is contacted and mixed with the oil-based drilling fluid, the flow capacity of the mixed slurry is poor, which can seriously affect the construction safety. Meanwhile, an oil-wet adhesion layer and a filter cake are easily generated on the surface of the sleeve and the surface of the well wall, so that the compressive strength and the cementing strength of finally-cured cement are greatly reduced, and the well cementation quality is influenced.
In order to solve the technical problem, for shale gas wells using oil-based drilling fluid, oil-flooding type flushing spacer fluid is generally used in well cementation to clean the well wall and the outer wall of a casing and change the wettability. The flushing spacer fluid is an intermediate fluid which can effectively improve the interface performance and effectively avoid the contact pollution effect of the fluid, and is usually used before well cementation and cementing. The related technology provides an oil displacement type flushing spacer fluid, which comprises 100 parts of cleaning fluid, 1-5 parts of guar gum and 100-400 parts of weighting agent; the cleaning solution comprises: 2 to 25 percent of dodecyl dimethyl betaine, 2 to 20 percent of sodium octadecyl toluene sulfonate, 5 to 25 percent of nonylphenol polyoxyethylene ether, 0.1 to 15 percent of furfural, 0.5 to 10 percent of sodium lignosulfonate, 0.3 to 5 percent of butyl hydroxy anisole and the balance of clear water.
In the process of implementing the invention, the inventor finds that the following problems are few in the related art:
the cleaning efficiency of the oil displacement type flushing spacer fluid provided by the related technology is still to be improved, and the high temperature resistance is poor.
Disclosure of Invention
In view of the above, the present invention provides an oil displacement type flushing spacer fluid and a preparation method thereof, which can solve the above technical problems.
Specifically, the method comprises the following technical scheme:
on one hand, the embodiment of the invention provides an oil displacement type flushing spacer fluid, which comprises the following components in parts by weight: 200 parts of water;
6-12 parts of a surfactant;
0.2 to 1.0 portion of suspension stabilizer;
0.3 to 1.5 portions of tackifier;
0.4-3.0 parts of a dispersant;
30-350 parts of weighting agent;
0.1-0.2 part of defoaming agent.
In some possible implementations, the surfactant is composed of lauryl glucoside, fatty alcohol-polyoxyethylene ether, sodium lauroamphoacetate, alkylphenol ethoxylates, and sodium dodecylbenzenesulfonate.
In some possible implementations, the mass ratio of the lauryl glucoside, the fatty alcohol-polyoxyethylene ether, the sodium lauroamphoacetate, the alkylphenol ethoxylate, and the sodium dodecylbenzenesulfonate is 1.5 to 4.
In some possible implementations, the suspension stabilizer is selected from at least one of hydroxyethyl cellulose, sodium alginate, sodium polyacrylate.
In some possible implementations, the viscosifier consists of a polyanionic cellulose and sodium carboxymethyl cellulose.
In some possible implementations, the mass ratio of the polyanionic cellulose to the sodium carboxymethyl cellulose is 2-5:1.
In some possible implementations, the dispersant is an oil well cement dispersant.
In some possible implementations, the weighting agent is selected from at least one of iron ore powder, barite powder, limestone powder, and galena powder.
In some possible implementations, the defoamer is a polydimethylsiloxane defoamer.
On the other hand, the embodiment of the invention also provides a preparation method of the oil displacement type flushing spacer fluid, and the oil displacement type flushing spacer fluid is the oil displacement type flushing spacer fluid;
the preparation method comprises the following steps: adding part of water, surfactant and suspension stabilizer into a first reactor according to the weight parts of the components in the oil-displacing type flushing spacer fluid, stirring at a rotating speed of 6000-7500 r/min for a first set time, and then stirring at a rotating speed of 7000-8000 r/min for a second set time to form a first mixed solution;
adding the other part of water and the tackifier into the second reactor, stirring for a third set time, then adding the dispersant into the second reactor, uniformly stirring, and continuously adding the weighting agent into the second reactor to form a second mixed solution;
and uniformly mixing the first mixed solution and the second mixed solution, continuously adding a defoaming agent into the second reactor, and stirring for a fourth set time to obtain the oil displacement type flushing spacer fluid.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the oil displacement type flushing spacer fluid provided by the embodiment of the invention has good high temperature resistance (suitable for 25-160 ℃), compatibility and stability through the synergistic effect of the components. Particularly, the oil displacement type flushing spacer fluid has better rheological compatibility and thickening compatibility with oil-based drilling fluid and well cementation cement slurry, and the compression strength of the cement stone mixed with the spacer fluid can meet the well cementation construction requirement; the cleaning efficiency of the oil displacement type flushing spacer fluid is higher than 90%, and the oil displacement type flushing spacer fluid has an excellent oil displacement effect.
Detailed Description
In order to make the technical solutions and advantages of the present invention more clear, embodiments of the present invention will be described in further detail below.
On one hand, the embodiment of the invention provides an oil displacement type flushing spacer fluid, which comprises the following components in parts by weight: 200 parts of water;
6-12 parts of a surfactant;
0.2 to 1.0 portion of suspension stabilizer;
0.3 to 1.5 portions of tackifier;
0.4-3.0 parts of a dispersant;
30-350 parts of weighting agent;
0.1 to 0.2 portion of defoaming agent.
Exemplary parts by weight of the surfactant include, but are not limited to: 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts and the like;
the parts by weight of the suspension stabilizer include but are not limited to: 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part and the like;
the parts by weight of the tackifier include, but are not limited to: 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part and the like;
the weight parts of the dispersant include but are not limited to: 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, 1.5 part, 2 parts, 2.5 parts and the like;
the weight parts of the weighting agent include but are not limited to: 30 parts, 50 parts, 70 parts, 80 parts, 100 parts, 150 parts, 200 parts and the like;
the parts by weight of the defoaming agent include but are not limited to: 0.1 part, 0.12 part, 0.15 part, 0.16 part, 0.17 part, 0.18 part, 0.19 part and the like.
The oil displacement type flushing spacer fluid provided by the embodiment of the invention has good high temperature resistance (suitable for 25-160 ℃), compatibility and stability through the synergistic effect of the components. Particularly, the oil displacement type flushing spacer fluid has better rheological compatibility and thickening compatibility with oil-based drilling fluid and well cementation cement slurry, and the compression strength of the cement stone mixed with the spacer fluid can meet the well cementation construction requirement; the oil displacement type flushing spacer fluid has the cleaning efficiency higher than 90 percent and has excellent oil displacement effect.
The following further details are provided for each component in the flooding type flushing spacer fluid provided by the embodiment of the present invention:
in some possible implementations, the surfactant is composed of lauryl glucoside, fatty alcohol-polyoxyethylene ether, sodium lauroamphoacetate, alkylphenol ethoxylates, and sodium dodecylbenzenesulfonate.
Illustratively, the mass ratio of lauryl glucoside, fatty alcohol-polyoxyethylene ether, sodium lauroamphoacetate, alkylphenol ethoxylate to sodium dodecylbenzene sulfonate is 1.5-4.
In particular, each component of the above surfactants is common in the art and can be obtained by commercially available products.
For example, the lauryl glucoside may be selected from lauryl glucoside APG1214, where the lauryl glucoside APG1214 is a green environmentally friendly surfactant, mild in performance, low in irritation to the human body, soft to the skin, non-irritating to the eyes, and ecologically compatible.
The fatty alcohol-polyoxyethylene ether may be selected from fatty alcohol-polyoxyethylene ether JFC series, such as JFC-6, manufactured and sold by Wuhan Haishan science and technology Limited; the fatty alcohol-polyoxyethylene ether JFC-6 is a nonionic surfactant and has a good oil displacement effect.
The lauroyl amphoteric sodium acetate can be selected from lauroyl amphoteric sodium acetate MAB-40, such as the Tianci/TC-MAB 40LDL manufactured and sold by Tianci high New materials, inc., guangzhou; lauroamphoacetate MAB-40 is an amphoteric surfactant with both positively and negatively charged groups.
The alkylphenol ethoxylates OP-10 can be selected from alkylphenol ethoxylates OP-10 (also called dodecyl phenol polyoxyethylene OP-10), and the alkylphenol polyoxyethylene OP-10 has wide HLB value adjustability, excellent hard water resistance and acid and alkali resistance.
The sodium dodecylbenzene sulfonate may be selected from the sodium dodecylbenzene sulfonate LAS series, such as sodium dodecylbenzene sulfonate LAS-80 manufactured and sold by Guangzhou Chongjun chemical company Limited. Of these, sodium dodecylbenzenesulfonate LAS is a commonly used anionic surfactant.
The selection of the surfactant of the above kind is determined by the inventor after many researches, and through research and tests, the washing isolation liquid using the surfactant can obtain the washing efficiency of more than 94%. The reason is researched to be that: the 5 types of surfactants generate antagonistic action and synergistic action among the compounded surfactants under the composition proportion, play a mechanism of reducing interfacial tension, a mechanism of wetting reversion, an emulsification and compatibilization mechanism, a permeation mechanism and a mechanism of coalescence to form an oil zone in the flushing spacer fluid, and ensure that the cleaning efficiency is higher than 94%.
The oil displacement type flushing spacer fluid provided by the embodiment of the invention can improve the well cementation quality under the condition of the oil-based drilling fluid under the synergistic effect of the components. Particularly, surfactant molecules with amphiphilicity in the flushing spacer fluid can be adsorbed on the surfaces of cement particles to increase the flowing behavior among the cement particles; the surfactant and the emulsifier of the oil-based drilling fluid generate a combination effect, so that the osmotic pressure effect of the oil-based drilling fluid is damaged to improve the rheological property of the mixed slurry of the cement slurry and the oil-based drilling fluid; the surfactant traps and disperses oil phase substances in the mixed slurry by using the emulsification and dispersion effects, so that the damage to a set cement structure is reduced, and the compressive strength is improved. Through the action, the flushing spacer fluid can clean oil-based drilling fluid adhered to the casing wall and a drilling fluid filter cake formed by the well wall, meanwhile, surfactant molecules in the flushing spacer fluid can be adsorbed on the surfaces of the casing and the well wall, the states of a first interface (an interface between a cement sheath and the casing) and a second interface (an interface between the cement sheath and the well wall) are changed, the first interface and the second interface are changed from lipophilicity to hydrophilicity, and the cementing quality of the cement sheath of the first interface and the second interface is remarkably improved.
In some possible implementations, in the flooding type spacer flush fluid provided in the embodiments of the present invention, the suspension stabilizer is at least one selected from hydroxyethyl cellulose, sodium alginate, and sodium polyacrylate. This type of suspension stabilizer has a high degree of dispersion, a large surface area and a strong adsorption power, and can affect the surrounding water and other surrounding particles so that they do not sink rapidly, thereby maintaining the concentration of the flushing spacer in suspension.
In some possible implementations, in the flooding-type flushing spacer fluid provided by the embodiments of the present invention, the tackifier is composed of polyanionic cellulose and sodium carboxymethyl cellulose.
Illustratively, the mass ratio of polyanionic cellulose to sodium carboxymethylcellulose is from 2 to 5:1, e.g., 3:1. Viscosifiers of the above kind enable the flooding type spacer to be maintained at a desired viscosity.
In some possible implementations, the flooding type flushing spacer fluid provided by the embodiments of the present invention includes a dispersant that is an oil well cement dispersant, such as a sulfonated aldehyde ketone polycondensate oil well cement dispersant, such as sulfonated aldehyde ketone polycondensate oil well cement dispersants USZ, SAF, SXF, and the like.
In some possible implementations, the flooding-type flushing spacer fluid provided by the embodiments of the present invention, the weighting agent is at least one selected from iron ore powder, barite powder, limestone powder and galena powder, so as to obtain a desired density of the flushing spacer fluid.
Illustratively, the weighting agent is selected from iron ore fines, the major constituent of which is Fe 2 O 3 Density 4.9g/cm 3 -5.3g/cm 3 It is suitable for preparing drilling fluid with higher density. If a certain drilling fluid is weighted to a given density, when iron ore powder is selected, the solid phase content of the weighted drilling fluid is obviously lower than that of the weighted drilling fluid when barite is selected, and the lower solid phase content of the weighted drilling fluid is beneficial to regulating and controlling rheological property and improving drilling speed. In addition, because the iron ore powder has certain acid solubility, the iron ore powder can be applied to a production layer needing acidification. And the hardness of the iron ore powder is about twice of that of the barite, so the iron ore powder is resistant to grinding, the particle size is kept better in use, and the loss rate is lower.
In some possible implementation manners, in the oil displacement type flushing spacer fluid provided by the embodiment of the invention, the defoaming agent is a polydimethylsiloxane defoaming agent, so that excellent overall defoaming efficiency can be obtained.
In conclusion, the oil displacement type flushing spacer fluid provided by the embodiment of the invention has good temperature resistance, compatibility, interface modification and stability. The flushing spacer fluid has better rheological compatibility and thickening compatibility with the oil-based drilling fluid and the well cementation cement slurry, and the compressive strength of the cement stone mixed with the spacer fluid can meet the well cementation construction requirements.
On the other hand, the embodiment of the invention also provides a preparation method of the oil displacement type flushing spacer fluid, and the oil displacement type flushing spacer fluid is the oil displacement type flushing spacer fluid;
the preparation method comprises the following steps: adding part of water, surfactant and suspension stabilizer into a first reactor according to the weight parts of each component in the oil displacement type flushing spacer fluid, stirring at the rotating speed of 6000 r/min-7500 r/min for a first set time, and then stirring at the rotating speed of 7000 r/min-8000 r/min for a second set time to form a first mixed solution;
adding the other part of water and the tackifier into the second reactor, stirring for a third set time, then adding the dispersant into the second reactor, uniformly stirring, and continuously adding the weighting agent into the second reactor to form a second mixed solution;
and uniformly mixing the first mixed solution and the second mixed solution, continuously adding a defoaming agent into the second reactor, and stirring for a fourth set time to obtain the oil displacement type flushing spacer fluid.
The oil displacement type flushing spacer fluid provided by the embodiment of the invention has the advantages of simple preparation method and simple and easily-obtained materials, and can adapt to well cementation site conditions.
For example, the first reactor and the second reactor may each employ a stirring cup.
Illustratively, 100 parts of water, 6 to 12 parts of surfactant and 0.2 to 1.0 part of suspension stabilizer are put into the first slurry cup, and the first slurry cup is stirred at a rotating speed of 6000r/min to 7500r/min for a first set time, such as 10min to 15min, and then stirred at a rotating speed of 7000r/min to 8000r/min for a second set time, such as 6min to 10min, so as to form a first milky mixed liquid.
Adding 100 parts of water into the second slurry cup, continuously adding 0.3-1.5 parts of tackifier, and stirring for a third set time, such as 3-5 hours; then 0.4 to 3.0 parts of dispersant is added in sequence, evenly stirred and added with 30 to 350 parts of weighting agent to the required density of the flushing spacer fluid to form a second mixed solution.
And uniformly mixing the first mixed solution and the second mixed solution, adding 0.1-0.2 part of defoaming agent into the second slurry cup, and stirring for a fourth set time, such as 25-35 min, so as to obtain the oil displacement type flushing spacer fluid.
Compared with the related art, the oil displacement type flushing spacer fluid provided by the embodiment of the invention has at least the following beneficial effects:
(1) The oil displacement type flushing spacer fluid has a wide density range of 1.30g/cm 3 ～2.50g/cm 3 The range of the shale gas well is adjustable, the high-density spacer fluid can be weighted to meet the design requirement at one time, and the well cementation requirement of the shale gas well is ensured;
(2) The oil displacement type flushing spacer fluid keeps stable performance within the temperature range of 25-160 ℃, and can meet the well cementation requirement of a deep shale gas well;
(3) The oil displacement type flushing spacer fluid is simple in preparation method and material, and can adapt to well cementation site conditions;
(4) The cleaning efficiency of the oil displacement type flushing spacer fluid is higher than 90 percent and even reaches 94 percent, and the oil displacement type flushing spacer fluid has excellent oil displacement effect.
The following examples are further illustrative of the present invention but are not to be construed as limiting the embodiments.
The oil-based drilling fluid samples used in the following examples are white oil-based drilling fluids used in drilling certain shale gas wells, and the main indexes of the white oil-based drilling fluids are shown in table 1.
TABLE 1
| Item | Density, g/cm 3 | Using well depth, m | The well temperature is applied |
| Oil-based drilling fluid sample | 2.10 | 3500 | 120 |
Example 1
The embodiment 1 provides an oil displacement type flushing spacer fluid, which comprises the following components in parts by weight: 200 parts of water; 8 parts of a surfactant; 0.2 part of suspension stabilizer; 0.3 part of tackifier; 1.0 part of a dispersant; 30 parts of weighting agent; 0.2 part of a defoaming agent.
The surfactant comprises lauryl glucoside APG1214, fatty alcohol-polyoxyethylene ether JFC-6, sodium lauroamphoacetate MAB-40, alkylphenol polyoxyethylene ether OP-10 and sodium dodecyl benzene sulfonate LAS in a mass ratio of 2. The suspension stabilizer is selected from hydroxyethyl cellulose. The tackifier consists of polyanionic cellulose and sodium carboxymethyl cellulose in a mass ratio of 3:1. The dispersant is sulfonated aldehyde ketone polycondensate oil well cement dispersant USZ. The weighting agent is selected from iron ore powder. The defoaming agent is polydimethylsiloxane defoaming agent.
The oil displacement type flushing spacer fluid is prepared by the following method:
100 parts of water, surfactant and suspension stabilizer are put into the first slurry cup, stirred for 15min at the rotating speed of 7000r/min and then stirred for 8min at the rotating speed of 7500r/min to form a milky first mixed solution.
Adding 100 parts of water into the second slurry cup, continuously adding the tackifier, and stirring for 4 hours; and adding the dispersing agent into the second slurry cup, uniformly stirring, and adding the weighting agent to the required flushing spacer fluid density to form a second mixed solution.
Uniformly mixing the first mixed solution and the second mixed solution, adding a defoaming agent into the second slurry cup, and stirring for 30min to obtain a mixture with the density of 1.35g/cm 3 The oil displacement type flushing spacer fluid.
Example 2
The embodiment 2 provides an oil displacement type flushing spacer fluid, which comprises the following components in parts by weight: 200 parts of water; 10 parts of a surfactant; 0.4 part of a suspension stabilizer; 0.5 part of tackifier; 0.5 part of a dispersant; 200 parts of weighting agent; 0.1 part of a defoaming agent.
Wherein the surfactant comprises lauryl glucoside APG1214, fatty alcohol-polyoxyethylene ether JFC-6, sodium lauroamphoacetate MAB-40, alkylphenol polyoxyethylene ether OP-10 and sodium dodecyl benzene sulfonate LAS in a mass ratio of 2; the suspension stabilizer is selected from hydroxyethyl cellulose; the tackifier consists of polyanionic cellulose and sodium carboxymethyl cellulose with the mass ratio of 3:1; the dispersant is sulfonated aldehyde ketone polycondensate oil well cement dispersant USZ; the weighting agent is iron ore powder; the defoaming agent is polydimethylsiloxane defoaming agent.
The oil displacement type flushing spacer fluid is prepared by the following method:
100 parts of water, surfactant and suspension stabilizer are put into the first slurry cup, stirred for 12min at the rotating speed of 7200r/min and then stirred for 9min at the rotating speed of 7400r/min to form a milky first mixed solution.
Adding 100 parts of water into the second slurry cup, continuously adding the tackifier, and stirring for 5 hours; and adding the dispersing agent into the second slurry cup, uniformly stirring, and adding the weighting agent to the required flushing spacer fluid density to form a second mixed solution.
Uniformly mixing the first mixed solution and the second mixed solution, adding a defoaming agent into the second slurry cup, and stirring for 25min to obtain a mixture with the degree of 1.80g/cm 3 The oil displacement type flushing spacer fluid.
Example 3
The embodiment 3 provides an oil displacement type flushing spacer fluid, which comprises the following components in parts by weight: 200 parts of water; 12 parts of a surfactant; 0.6 part of suspension stabilizer; 0.6 part of tackifier; 2 parts of a dispersant; 350 parts of weighting agent; 0.15 part of a defoaming agent.
Wherein the surfactant comprises lauryl glucoside, fatty alcohol-polyoxyethylene ether, sodium lauroamphoacetate, alkylphenol ethoxylate and sodium dodecyl benzene sulfonate in a mass ratio of 2.5. The suspension stabilizer is selected from sodium alginate. The tackifier consists of polyanionic cellulose and sodium carboxymethyl cellulose with the mass ratio of 2.5. The dispersant is a sulfonated aldehyde ketone polycondensate oil well cement dispersant SAF. The weighting agent is selected from iron ore powder. The defoaming agent is polydimethylsiloxane defoaming agent.
The oil displacement type flushing spacer fluid is prepared by the following method:
100 parts of water, surfactant and suspension stabilizer are put into the first slurry cup, and are stirred at the rotating speed of 6800r/min for a first set time, for example, 13min, and then are stirred at the rotating speed of 7500r/min for 10min to form a first milky mixed liquid.
Adding 100 parts of water into the second slurry cup, continuously adding the tackifier, and stirring for 3 hours; and adding the dispersing agent into the second slurry cup, uniformly stirring, and adding the weighting agent to the required flushing spacer fluid density to form a second mixed solution.
Mixing the first mixed solution and the second mixed solution uniformly, adding defoaming agent into the second slurry cup, and stirring for 30min to obtain a mixture with a density of 2.35g/cm 3 The oil displacement type flushing spacer fluid.
Example 4
The embodiment 4 provides an oil displacement type flushing spacer fluid, which comprises the following components in parts by weight: 200 parts of water; 10 parts of a surfactant; 0.5 part of suspension stabilizer; 0.8 part of tackifier; 1 part of a dispersant; 220 parts of weighting agent; 0.2 part of a defoaming agent.
Wherein the surfactant comprises lauryl glucoside, fatty alcohol-polyoxyethylene ether, sodium lauroamphoacetate, alkylphenol ethoxylate and sodium dodecyl benzene sulfonate in a mass ratio of 2.5. The suspension stabilizer is selected from sodium alginate; the tackifier consists of polyanionic cellulose and sodium carboxymethyl cellulose with the mass ratio of 3.5; the dispersant is a sulfonated aldehyde ketone polycondensate oil well cement dispersant SAF; the weighting agent is selected from barite powder; the defoaming agent is polydimethylsiloxane defoaming agent.
The oil displacement type flushing spacer fluid is prepared by the following method:
water, surfactant and suspension stabilizer are put into the first slurry cup, and are stirred for 10min at the rotating speed of 7000r/min, and then are stirred for 6min at the rotating speed of 8000r/min, so that a milky first mixed solution is formed.
Adding 100 parts of water into the second slurry cup, continuously adding the tackifier, and stirring for 4 hours; and adding the dispersing agent into the second slurry cup, uniformly stirring, and adding the weighting agent to the required flushing spacer fluid density to form a second mixed solution.
And uniformly mixing the first mixed solution and the second mixed solution, adding a defoaming agent into the second slurry cup, and stirring for 35min to obtain the oil displacement type flushing spacer fluid.
Test example
(1) And (3) testing the sedimentation stability of the oil displacement type flushing spacer fluid:
during the operation of suspension stability testing, each oil displacement type flushing spacer fluid is maintained for 2 hours by a pressurizing densifier at the experimental temperature, then the flushing spacer fluid is poured into a 1000mL measuring cylinder, and the flushing spacer fluid is stood for 2 hours to measure the density difference and the free fluid.
The experimental results are shown in Table 2, and the test results show that the oil displacement type flushing isolation liquid system prepared in the examples 1-4 has good sedimentation stability, and the density difference of 2 hours is less than 0.03g/cm 3 The free liquid is zero.
TABLE 2
(2) And (3) testing the cleaning efficiency of the oil displacement type flushing spacer fluid:
and (3) maintaining the flushing spacer fluid for 60min at the experimental temperature by using a densifier, and testing the cleaning efficiency of the flushing spacer fluid by using a six-speed rotational viscometer method, wherein the cleaning time is 15min. The experimental results are shown in table 3, and the results show that the oil displacement type flushing spacer fluid obtains excellent cleaning efficiency.
TABLE 3 cleaning efficiency of rinse spacer
| Temperature/. Degree.C | Example 1 | Example 2 | Example 3 | Example 4 |
| 25 | 90.5％ | 94％ | 92％ | 93％ |
| 90 | 91％ | 93％ | 93％ | 93％ |
| 150 | 92％ | 94％ | 95％ | 94％ |
(3) Testing the interface bond strength of the oil displacement type flushing spacer fluid:
the cementation strength is a reaction on the cleaning efficiency and the surface wettability of the oil displacement type flushing spacer fluid to a great extent, the cementation strength is high when the flushing efficiency is high and the surface wetting effect is good, and the cementation strength is low otherwise. According to the embodiment of the invention, the interface cementation strength of each oil displacement type flushing spacer fluid is subjected to standard test at 90 ℃, the experimental result is shown in table 4, and the oil displacement type flushing spacer fluid provided by the embodiment can obviously improve the cementation quality of the cement sheath of the first interface and the second interface.
TABLE 4
In embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The oil displacement type flushing spacer fluid is characterized by comprising the following components in parts by weight: 200 parts of water;
6-12 parts of a surfactant;
0.2 to 1.0 portion of suspension stabilizer;
0.3 to 1.5 portions of tackifier;
0.4-3.0 parts of a dispersant;
30-350 parts of weighting agent;
0.1 to 0.2 portion of defoaming agent.
2. The flooding flush spacer fluid of claim 1 wherein the surfactant is comprised of lauryl glucoside, fatty alcohol polyoxyethylene ether, sodium lauroamphoacetate, alkylphenol ethoxylates, and sodium dodecylbenzenesulfonate.
3. The flooding type flushing spacer of claim 2, wherein the mass ratio of the lauryl glucoside, the fatty alcohol-polyoxyethylene ether, the sodium lauroamphoacetate, the alkylphenol ethoxylate and the sodium dodecylbenzenesulfonate is 1.5-4.
4. The flooding type flushing spacer fluid of claim 1, wherein the suspension stabilizer is selected from at least one of hydroxyethyl cellulose, sodium alginate and sodium polyacrylate.
5. The flooding flush spacer of claim 1 wherein the viscosifier comprises a polyanionic cellulose and sodium carboxymethyl cellulose.
6. The flooding type flushing spacer fluid of claim 5, wherein the mass ratio of the polyanionic cellulose to the sodium carboxymethyl cellulose is 2-5:1.
7. The flooding flush spacer of claim 2 wherein the dispersant is an oil well cement dispersant.
8. The flooding type flushing spacer fluid of claim 1, wherein the weighting agent is at least one selected from the group consisting of iron ore powder, barite powder, limestone powder, and galena powder.
9. The flooding flush spacer of claim 1 wherein the defoamer is a polydimethylsiloxane defoamer.
10. A method for preparing an oil displacement type flushing spacer fluid, which is characterized in that the oil displacement type flushing spacer fluid is the oil displacement type flushing spacer fluid of any one of claims 1 to 9;
the preparation method comprises the following steps: adding part of water, surfactant and suspension stabilizer into a first reactor according to the weight parts of the components in the oil-displacing type flushing spacer fluid, stirring at a rotating speed of 6000-7500 r/min for a first set time, and then stirring at a rotating speed of 7000-8000 r/min for a second set time to form a first mixed solution;
adding the other part of water and the tackifier into the second reactor, stirring for a third set time, then adding the dispersant into the second reactor, uniformly stirring, and continuously adding the weighting agent into the second reactor to form a second mixed solution;
and uniformly mixing the first mixed solution and the second mixed solution, continuously adding a defoaming agent into the second reactor, and stirring for a fourth set time to obtain the oil displacement type flushing spacer fluid.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116376526A (en) * | 2023-05-29 | 2023-07-04 | 成都华阳兴华化工有限公司 | Ultra-deep shale gas well high-temperature pipe column cleaning liquid and preparation method thereof |
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| CN108559466A (en) * | 2018-06-21 | 2018-09-21 | 中国石油集团长城钻探工程有限公司固井公司 | A kind of high density displacement of reservoir oil leakproof flushing spacer fluid and preparation method thereof |
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| CN103555304A (en) * | 2013-11-08 | 2014-02-05 | 沈阳工业大学 | High-efficiency oil-based flushing spacer liquid and preparation method thereof |
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