CN112063375A - High-temperature-resistant high-density oil-based well completion fluid and preparation method thereof - Google Patents
High-temperature-resistant high-density oil-based well completion fluid and preparation method thereof Download PDFInfo
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- CN112063375A CN112063375A CN202010950835.9A CN202010950835A CN112063375A CN 112063375 A CN112063375 A CN 112063375A CN 202010950835 A CN202010950835 A CN 202010950835A CN 112063375 A CN112063375 A CN 112063375A
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- 239000012530 fluid Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000000080 wetting agent Substances 0.000 claims abstract description 10
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims abstract description 8
- 239000001110 calcium chloride Substances 0.000 claims abstract description 8
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 8
- 239000000292 calcium oxide Substances 0.000 claims abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002689 soil Substances 0.000 claims abstract description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000654 additive Substances 0.000 claims abstract description 5
- 230000000996 additive effect Effects 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 7
- 239000000047 product Substances 0.000 claims description 7
- 239000010428 baryte Substances 0.000 claims description 6
- 229910052601 baryte Inorganic materials 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 4
- 239000000194 fatty acid Substances 0.000 claims description 4
- 229930195729 fatty acid Natural products 0.000 claims description 4
- 150000004665 fatty acids Chemical class 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 125000003368 amide group Chemical group 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000007957 coemulsifier Substances 0.000 claims description 2
- 239000004021 humic acid Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 239000000725 suspension Substances 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 8
- 238000004062 sedimentation Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- OCKGFTQIICXDQW-ZEQRLZLVSA-N 5-[(1r)-1-hydroxy-2-[4-[(2r)-2-hydroxy-2-(4-methyl-1-oxo-3h-2-benzofuran-5-yl)ethyl]piperazin-1-yl]ethyl]-4-methyl-3h-2-benzofuran-1-one Chemical compound C1=C2C(=O)OCC2=C(C)C([C@@H](O)CN2CCN(CC2)C[C@H](O)C2=CC=C3C(=O)OCC3=C2C)=C1 OCKGFTQIICXDQW-ZEQRLZLVSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-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
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
- C09K8/34—Organic liquids
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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
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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)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention provides a high-temperature-resistant high-density oil-based well completion fluid and a preparation method thereof, belonging to the technical field of petroleum exploration and development. The high-density oil-based completion fluid is prepared from the following raw materials, by weight, 80-90 parts of white oil, 10-20 parts of a calcium chloride aqueous solution, 20-30 parts of a main emulsifier, 10-20 parts of an auxiliary emulsifier, 5-10 parts of organic soil, 5-10 parts of a shear strength improver, 10-15 parts of a wetting agent, 25-30 parts of a fluid loss additive, 5-10 parts of calcium oxide and 150-200 parts of a weighting material. The product obtained by the invention has good quality stability, the particle size D50 of the product is less than 1.5 microns, the temperature resistance of the product can reach more than 240 ℃, the density of the product can reach more than 2.5g/cm3, the product has good rheological property and suspension stability for 15-20 days under the high-temperature condition, does not pollute stratum and can be repeatedly used.
Description
Technical Field
The invention belongs to the technical field of petroleum exploration and development, and particularly relates to a high-temperature-resistant high-density oil-based completion fluid and a preparation method thereof.
Background
At present, oil drilling is continuously developed towards deep strata, more and more wells with the well depth of more than 6000 meters are formed, the temperature of the bottom of the well is higher and higher along with the increase of the drilling depth, and more high-pressure strata are drilled. The bottom temperature of part of the well reaches 200 ℃, and the formation pressure coefficient reaches 2.30. The completion fluid faces the challenges of high temperature and high pressure, a large amount of solid-phase weighting materials are required to be added into the high-density drilling completion fluid to improve the density, so that the solid-phase content in the drilling completion fluid is high, the completion operation requires that the high-density completion fluid has good high-temperature sedimentation stability, the viscosity of the general oil-based completion fluid is reduced under the action of high temperature, and the high-density solid phase is easy to settle under the action of gravity. The basic contradiction between the high-temperature rheological property and the sedimentation stability of the completion fluid which are difficult to control exists in field application.
After the completion of the south edge well of the Xinjiang Quercoll basin, the formation pressure coefficient is high, the drilling fluid is required to have higher density, and the temperature resistance and the various pollution resistance (comprehensive pollution of saturated salt, gypsum and drilling cuttings) are stronger. The particle size of the conventional weighting agent (such as barite powder) is usually between 10 and 70 microns, and the phenomena of high barite sedimentation rate, uneven drilling fluid density and the like frequently occur in the application process. To solve the suspension problem, a large amount of treating agent is usually added. However, as the addition amount of the treating agent is increased, on one hand, the cost of the drilling fluid is increased sharply; on the other hand, the rheological property of the drilling fluid is deteriorated and difficult to control, and the lower rheological parameter is kept to effectively control the circulating equivalent density (ECD) and the higher viscous shear to ensure that the contradiction between the suspension property of the barite is difficult to reconcile, thereby seriously affecting the safety of the well completion work. Therefore, it is very important to develop a high density oil-based completion fluid.
Disclosure of Invention
The invention provides a high-temperature-resistant high-density oil-based completion fluid and a preparation method thereof, which aim to solve the technical problems.
The invention provides a high-density oil-based completion fluid which is prepared from the following raw materials, by weight, 80-90 parts of white oil, 10-20 parts of a calcium chloride aqueous solution, 20-30 parts of a main emulsifier, 10-20 parts of an auxiliary emulsifier, 5-10 parts of organic soil, 5-10 parts of a shear strength improver, 10-15 parts of a wetting agent, 25-30 parts of a fluid loss additive, 5-10 parts of calcium oxide and 150-200 parts of a weighting material.
Further, the white oil is 3# white oil.
Further, the concentration of the calcium chloride aqueous solution was 30 wt%.
Further, the primary emulsifier is a derivative of a fatty acid.
Further, the coemulsifier is an amine derivative of a fatty acid.
Further, the extraction and cutting agent is an amine derivative of polyamide.
Further, the wetting agent is an amido polyether.
Further, the fluid loss additive is humic acid amide.
Further, the weighting material is at least one of barite, calcium carbonate or iron ore powder.
The invention also provides a preparation method of the high-density oil-based completion fluid, which comprises the following steps,
(1) putting the white oil into a mud pot, adding a main emulsifier and an auxiliary emulsifier, and stirring to obtain a first mixture;
(2) adding a calcium chloride aqueous solution into the mixture I, and stirring to obtain a mixture II;
(3) and adding organic soil, a cutting agent, a wetting agent, a filtrate reducer, calcium oxide and a weighting material into the mixture II, stirring, and monitoring the demulsification voltage to reach 400V to obtain the product.
The invention has the following advantages:
the product obtained by the invention has good quality stability, the grain diameter D50 of the product is less than 1.5 microns, the temperature resistance of the product can reach more than 240 ℃, and the density of the product can reach 2.5g/cm3The preparation method can ensure that the suspension has good rheological property and suspension stability for 15 to 20 days under the high-temperature condition, does not pollute stratum and can be repeatedly used.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1A high density oil-based completion fluid (in parts by mass)
9% of 3# white oil, 1% of calcium chloride aqueous solution, 2.5% of main emulsifier, 3% of auxiliary emulsifier, 0.5% of organic soil, 0.5% of cutting agent, 1% of wetting agent, 3% of filtrate reducer, 0.5% of CaO and barite;
the preparation method comprises the following steps: comprises the following steps of (a) carrying out,
(1) putting the white oil into a mud pot, adding a main emulsifier and an auxiliary emulsifier, and stirring to obtain a first mixture;
(2) adding a calcium chloride aqueous solution into the mixture I, and stirring to obtain a mixture II;
(3) and adding organic soil, a cutting agent, a wetting agent, a filtrate reducer, calcium oxide and a weighting material into the mixture II, stirring, and monitoring the demulsification voltage to reach 400V to obtain the product.
Example 2A high density oil-based completion fluid (in parts by mass)
8.8% of 3# white oil, 1.2% of water, 3% of main emulsifier, 2% of auxiliary emulsifier, 1% of organic soil, 0.5% of shear strength improving agent, 1% of wetting agent, 3% of filtrate reducer, 0.5% of CaO and barite
Test example 1
The Xinjiang oil field GT1 well has the well completion depth of 5920m, the well testing and completion fluid operation requirements, the well hydraulic well is completed by adopting the density of 2.43g/cm3, the temperature resistance of the completion fluid is 135 ℃, and the sedimentation stability reaches 15 days. The completion fluid obtained in example 1 was tested and the results are shown in table 1.
TABLE 1
The aging conditions were: multiplying by 16h at 200 ℃; the rheology test temperature was 50 ℃ and the HTHP fluid loss test temperature was 180 ℃.
The density reaches 2.50g/cm3, the hard precipitation of the weighting material does not occur after the material is kept stand for 15 days at the temperature of 135 ℃, and the sedimentation factor is less than 0.52.
2.43g/cm3 oil-based completion fluid is injected into a shaft on site, and the standing is continuously carried out for 10.5 days, so that the good high-temperature sedimentation stability is kept, and the smooth running of the well killing and oil testing operation is ensured.
Test example 2
The Bozin 12 well is a pre-exploration well which is positioned near a Bozin 12 construction high point in a combination part of a Kglasu construction zone with a Kglasu section and an Arwatt section, the design well depth is 6960m, and the actual drilling depth is 7057 m. In the drilling process of a zone of a Bozi 12 well, continuous leakage exists by using drilling fluid with the relative density of 1.85, the density window of safe drilling fluid is small, the chalk system of the Bozi 12 well is predicted to be 6963.5m (altitude-4871.6 m) in the Bashiki Qike group and the Brazilian reform group by using the Gezi 3 gas reservoir geothermal gradient (1.8 ℃/100m) and the static pressure gradient (0.37MPa/100m), the stratum temperature is about 143.93 ℃, the stratum pressure is about 125.01MPa, and the pressure coefficient is 1.83. The formation temperature was measured to be 137.7 ℃. The completion fluid from example 2 was tested. The results are shown in Table 2.
TABLE 2
The aging conditions were: multiplying by 16h at 140 ℃; the rheology test temperature was 50 ℃ and the HTHP fluid loss test temperature was 140 ℃.
The present invention is not limited to the above preferred embodiments, but rather, the present invention is to be construed as being limited to the embodiments and examples.
Claims (9)
1. The high-temperature-resistant high-density oil-based well completion fluid is characterized by being prepared from the following raw materials, by weight, 80-90 parts of white oil, 10-20 parts of a calcium chloride aqueous solution, 20-30 parts of a main emulsifier, 10-20 parts of an auxiliary emulsifier, 5-10 parts of organic soil, 5-10 parts of a shear improver, 10-15 parts of a wetting agent, 25-30 parts of a fluid loss additive, 5-10 parts of calcium oxide and 150-200 parts of a weighting material.
2. The completion fluid of claim 1, wherein the aqueous calcium chloride solution has a concentration of 30 wt%.
3. The completion fluid of claim 1, wherein the primary emulsifier is a derivative of a fatty acid.
4. The completion fluid of claim 1, wherein the coemulsifier is an amine derivative of a fatty acid.
5. The completion fluid of claim 1, wherein the shear promoter is an amine derivative of a polyamide.
6. The completion fluid of claim 1, wherein the wetting agent is an amido polyether.
7. The completion fluid of claim 1, wherein the fluid loss additive is a humic acid amide.
8. The completion fluid of claim 1, wherein the weighting material is at least one of barite, calcium carbonate, or iron ore fines.
9. A method for preparing the high temperature resistant high density oil-based completion fluid according to any one of claims 1 to 8, comprising the steps of,
(1) putting the white oil into a mud pot, adding a main emulsifier and an auxiliary emulsifier, and stirring to obtain a first mixture;
(2) adding a calcium chloride aqueous solution into the mixture I, and stirring to obtain a mixture II;
(3) and adding organic soil, a cutting agent, a wetting agent, a filtrate reducer, calcium oxide and a weighting material into the mixture II, stirring, and monitoring the demulsification voltage to reach 400V to obtain the product.
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| CN202010950835.9A CN112063375A (en) | 2020-09-11 | 2020-09-11 | High-temperature-resistant high-density oil-based well completion fluid and preparation method thereof |
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| CN202010950835.9A CN112063375A (en) | 2020-09-11 | 2020-09-11 | High-temperature-resistant high-density oil-based well completion fluid and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114015424A (en) * | 2021-12-06 | 2022-02-08 | 沙克(天津)石油技术服务有限公司 | Test oil slurry suitable for high-temperature high-pressure well |
| CN116144331A (en) * | 2021-11-22 | 2023-05-23 | 中国石油天然气集团有限公司 | Oil testing completion fluid and preparation method and application thereof |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116144331A (en) * | 2021-11-22 | 2023-05-23 | 中国石油天然气集团有限公司 | Oil testing completion fluid and preparation method and application thereof |
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