CN111100614A - While-drilling plugging leak-proof oil-based drilling fluid suitable for shale gas old area encrypted well - Google Patents
While-drilling plugging leak-proof oil-based drilling fluid suitable for shale gas old area encrypted well Download PDFInfo
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- CN111100614A CN111100614A CN201911215164.5A CN201911215164A CN111100614A CN 111100614 A CN111100614 A CN 111100614A CN 201911215164 A CN201911215164 A CN 201911215164A CN 111100614 A CN111100614 A CN 111100614A
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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
- C09K8/36—Water-in-oil emulsions
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/48—Density increasing or weighting additives
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
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- Engineering & Computer Science (AREA)
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- Inorganic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention provides a plugging-while-drilling leakproof oil-based drilling fluid suitable for an encrypted well in a shale gas old area, which comprises the following components in parts by volume: 100 parts of oil phase and water phase, 2.4-3.2 parts of main emulsifier, 0.6-1.0 part of auxiliary emulsifier, 1-3 parts of lime, 1-3 parts of organic soil, 1-5 parts of filtrate reducer, 1-3 parts of plugging agent, 1-2 parts of 10-mesh rigid particles, 1.5-3 parts of 80-mesh rigid particles, 2-4 parts of 100-mesh rigid particles, 1.5-2.5 parts of 80-mesh flexible deformable particles, 1.5-2.5 parts of 100-mesh flexible deformable particles and 0-100 parts of weighting agent. The product of the invention has good temperature resistance stability, plugging property and leak resistance, can adapt to drilling at different pressure layers, has certain anti-contamination capability of the fracturing fluid, and can be suitable for drilling construction of the shale gas old area encrypted well.
Description
Technical Field
The invention relates to the technical field of petroleum drilling engineering, in particular to a plugging-while-drilling leakproof oil-based drilling fluid suitable for an encrypted well in an old shale gas area.
Background
The stratum condition of the shale gas old area encryption well is completely different from the initial development stage, the pressure change of the stratum is large in the gas reservoir development process, the mechanical property of rock is changed along with the early development, particularly the adjacent well is acidized and fractured, and the changes can bring great challenges to the drilling of the encryption well. The oil-based drilling fluid has higher requirements on shale gas drilling oil-based drilling fluid, has better leakage-proof and collapse-proof performance, and can well deal with the pollution invasion risk of fracturing fluid. However, the drilling fluid on the market at present has difficulty in meeting the special requirements of the shale gas old area encrypted well, and therefore, the improvement of the prior art is needed.
Disclosure of Invention
The invention aims to provide a plugging and leakage-preventing oil-based drilling fluid while drilling, which is suitable for a shale gas old area encryption well.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a plugging and leakage-proof while-drilling oil-based drilling fluid suitable for an encrypted well in a shale gas old area comprises the following components in parts by volume: 100 parts of oil phase and water phase, 2.4-3.2 parts of main emulsifier, 0.6-1.0 part of auxiliary emulsifier, 1-3 parts of lime, 1-3 parts of organic soil, 1-5 parts of filtrate reducer, 1-3 parts of plugging agent, 1-2 parts of 10-mesh rigid particles, 1.5-3 parts of 80-mesh rigid particles, 2-4 parts of 100-mesh rigid particles, 1.5-2.5 parts of 80-mesh flexible deformable particles, 1.5-2.5 parts of 100-mesh flexible deformable particles and 0-100 parts of weighting agent.
According to the scheme, the oil phase is 0# diesel oil, 3# white oil, 5# white oil or gas oil, the water phase is 25-35 wt% of calcium chloride aqueous solution, and the volume ratio of the oil phase to the water phase is 70/30-90/10.
According to the scheme, the main emulsifier is a long-chain alkyl fatty alcohol amide nonionic surfactant, and the auxiliary emulsifier is a modified phosphate nonionic surfactant.
According to the scheme, the organic soil is organic bentonite.
According to the scheme, the fluid loss additive is modified sulfonated asphalt.
According to the above scheme, the blocking agent is modified humic acid.
According to the scheme, the rigid particles are one or a mixture of more than one of calcium carbonate, magnesium oxide and magnesium carbonate, and have the characteristics of high hardness and difficult deformation.
According to the scheme, the flexible deformation particles are a mixture of the modified organic gel polymer and the oil-based asphalt plugging material.
According to the scheme, the weighting agent is barite or limestone.
The preparation method comprises the following steps: adding the oil phase and the emulsifier into a stirring cup, sequentially adding lime, organic soil, a filtrate reducer, a plugging agent, rigid particles and flexible deformable particles under the condition of high-speed stirring, adding the water phase (fully emulsifying the system) after uniformly stirring, then adding the weighting agent, and uniformly stirring.
The performance indexes of the oil-based drilling fluid are shown in the table 1:
TABLE 1 Performance index
The invention has the beneficial effects that:
1) the demulsification voltage of the product reaches more than 400Volts, the dynamic-plastic ratio is more than 0.30, the dynamic shear force is more than 8Pa, the plastic viscosity is less than 60mPa & s, the high-temperature and high-pressure filtration loss is less than 3.0mL, and the plugging rate to a shale stratum reaches more than 90%;
2) the product has good anti-pollution performance and good leakage-proof plugging performance, a 10-20-mesh sand bed is used for high-temperature and high-pressure plugging experiments, can bear pressure of more than 7MPa, has wide temperature application range and can be applied at 50-150 ℃;
3) the product of the invention has better reservoir protection effect, and the permeability recovery value reaches more than 95%.
Detailed Description
The technical solution of the present invention will be described with reference to the following examples.
Example 1:
the invention provides a plugging-while-drilling leakproof oil-based drilling fluid suitable for an encrypted well in a shale gas old area, which comprises the following components in parts by volume: 300ml of No. 3 white oil, 100ml of a water phase (26% calcium chloride solution), 12.8ml of a main emulsifier, 4ml of an auxiliary emulsifier, 6ml of lime, 10ml of organic soil, 12ml of a fluid loss additive, 8ml of a blocking agent, 6ml of 10-mesh calcium carbonate, 10ml of 80-mesh calcium carbonate, 12ml of 100-mesh calcium carbonate, 6ml of 80-mesh flexible deformation particles, 10ml of 100-mesh flexible deformation particles and 240ml of barite.
Density of drilling fluid: 1.40g/cm3(ii) a And hot rolling for 16 hours at 150 ℃, and cooling to 50 ℃ to measure the performances of the drilling fluid, such as rheology, shale rolling recovery rate, leakage reduction rate and the like.
Example 2:
the invention provides a plugging-while-drilling leakproof oil-based drilling fluid suitable for an encrypted well in a shale gas old area, which comprises the following components in parts by volume: 300ml of gas oil, 100ml of water phase (26% calcium chloride solution), 12.8ml of main emulsifier, 4.0ml of auxiliary emulsifier, 10ml of lime, 10ml of organic soil, 12ml of fluid loss additive, 12ml of plugging agent, 8ml of 10-mesh calcium carbonate and magnesium oxide, 6ml of 80-mesh calcium carbonate and magnesium oxide, 8ml of 100-mesh calcium carbonate and magnesium oxide, 10ml of 80-mesh flexible deformation particles, 6ml of 100-mesh flexible deformation particles and 320ml of barite.
Density of drilling fluid: 1.50g/cm3(ii) a And hot rolling for 16 hours at 150 ℃, and cooling to 50 ℃ to measure the performances of the drilling fluid, such as rheology, shale rolling recovery rate, leakage reduction rate and the like.
Example 3:
the invention provides a plugging-while-drilling leakproof oil-based drilling fluid suitable for an encrypted well in a shale gas old area, which comprises the following components in parts by volume: 300ml of 0# diesel oil, 100ml of water phase (26% calcium chloride solution), 12.8ml of main emulsifier, 4ml of auxiliary emulsifier, 6ml of lime, 12ml of organic soil, 12ml of filtrate reducer, 8ml of plugging agent, 8ml of 10-mesh calcium carbonate and magnesium carbonate, 6ml of 80-mesh calcium carbonate and magnesium carbonate, 8ml of 100-mesh calcium carbonate and magnesium carbonate, 10ml of 80-mesh flexible deformable particles, 6ml of 100-mesh flexible deformable particles and 380ml of barite.
Density of drilling fluid: 1.60g/cm3(ii) a And hot rolling for 16 hours at 150 ℃, and cooling to 50 ℃ to measure the performances of the drilling fluid, such as rheology, shale rolling recovery rate, leakage reduction rate and the like.
Example 4:
the invention provides a plugging-while-drilling leakproof oil-based drilling fluid suitable for an encrypted well in a shale gas old area, which comprises the following components in parts by volume: 700ml of No. 5 white oil, 300ml of a water phase (35% calcium chloride solution), 32ml of a main emulsifier, 6ml of an auxiliary emulsifier, 30ml of lime, 10ml of organic bentonite, 10ml of a fluid loss additive, 10ml of a blocking agent, 10ml of 10-mesh calcium carbonate, 30ml of 80-mesh calcium carbonate, 20ml of 100-mesh calcium carbonate, 15ml of 80-mesh flexible deformable particles, 25ml of 100-mesh flexible deformable particles and 800ml of limestone.
Density of drilling fluid: 1.70g/cm3(ii) a And hot rolling for 16 hours at 150 ℃, and cooling to 50 ℃ to measure the performances of the drilling fluid, such as rheology, shale rolling recovery rate, leakage reduction rate and the like.
Example 5:
the invention provides a plugging-while-drilling leakproof oil-based drilling fluid suitable for an encrypted well in a shale gas old area, which comprises the following components in parts by volume: 900ml of No. 5 white oil, 100ml of water phase (25% calcium chloride solution), 24ml of main emulsifier, 10ml of auxiliary emulsifier, 10ml of lime, 30ml of organic soil, 50ml of fluid loss additive, 30ml of plugging agent, 20ml of 10-mesh magnesium oxide and magnesium carbonate mixture, 15ml of 80-mesh rigid magnesium oxide and magnesium carbonate mixture, 40ml of 100-mesh magnesium oxide and magnesium carbonate mixture, 25ml of 80-mesh flexible deformation particles, 15ml of 100-mesh flexible deformation particles and 600ml of limestone.
Density of drilling fluid: 1.80g/cm3(ii) a And hot rolling for 16 hours at 150 ℃, and cooling to 50 ℃ to measure the performances of the drilling fluid, such as rheology, shale rolling recovery rate, leakage reduction rate and the like.
The products of examples 1 to 5 were subjected to the relevant performance tests, the results of which are shown in table 2:
table 2 product properties of examples 1 to 5
Wherein: the rheological property test temperature is 50 ℃; AV: the apparent viscosity of the drilling fluid, mPa · s; PV: the plastic viscosity of the drilling fluid, mPa · s; YP: dynamic shear force of drilling fluid, Pa; YP/PV: the dynamic-plastic ratio of the drilling fluid; ES: demulsification voltage of drilling fluid, Volts; HTHP: the drilling fluid loses water, ml, at high temperature and high pressure at the hot rolling temperature.
The product of example 3 is applied to the Fuling shale gas productivity demonstration area in the fieldNo underground complexity exists, and the drilling fluid loss is 4-5 m per 150m before achievement application3After application, the drilling fluid loss is reduced to 1-2 m per drilling 150m footage3The product has good application effect of leak-proof plugging, and provides powerful technical support for the construction of medium petrochemical Fuling shale gas productivity demonstration areas.
The above embodiments are only used for illustrating but not limiting the technical solutions of the present invention, and although the above embodiments describe the present invention in detail, those skilled in the art should understand that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and any modifications and equivalents may fall within the scope of the claims.
Claims (9)
1. The plugging while drilling leakproof oil-based drilling fluid suitable for the shale gas old area encrypted well is characterized by comprising the following components in parts by volume: 100 parts of oil phase and water phase, 2.4-3.2 parts of main emulsifier, 0.6-1.0 part of auxiliary emulsifier, 1-3 parts of lime, 1-3 parts of organic soil, 1-5 parts of filtrate reducer, 1-3 parts of plugging agent, 1-2 parts of 10-mesh rigid particles, 1.5-3 parts of 80-mesh rigid particles, 2-4 parts of 100-mesh rigid particles, 1.5-2.5 parts of 80-mesh flexible deformable particles, 1.5-2.5 parts of 100-mesh flexible deformable particles and 0-100 parts of weighting agent.
2. The plugging and leakage-preventing while drilling oil-based drilling fluid suitable for the shale gas old area infill wells is characterized in that the oil phase is 0# diesel oil, 3# white oil, 5# white oil or gas oil, the water phase is 25-35 wt% of calcium chloride water solution, and the volume ratio of the oil phase to the water phase is 70/30-90/10.
3. The plugging-while-drilling leakproof oil-based drilling fluid suitable for the shale gas old zone infill wells is defined in claim 1, wherein the primary emulsifier is a long-chain alkyl fatty alcohol amide nonionic surfactant, and the secondary emulsifier is a modified phosphate ester nonionic surfactant.
4. The plugging while drilling leakproof oil-based drilling fluid suitable for the shale gas old area infill wells as claimed in claim 1, wherein the organic soil is organic bentonite.
5. The plugging while drilling leakproof oil-based drilling fluid suitable for shale gas old zone infill wells as claimed in claim 1, wherein the fluid loss additive is modified sulfonated asphalt.
6. The plugging-while-drilling leakproof oil-based drilling fluid suitable for the shale gas old area infill wells according to claim 1, wherein the plugging agent is modified humic acid.
7. The plugging leakage-preventing oil-based drilling fluid while drilling suitable for the shale gas old area infill well, according to claim 1, wherein the rigid particles are any one or a mixture of more than one of calcium carbonate, magnesium oxide and magnesium carbonate.
8. The plugging-while-drilling leakproof oil-based drilling fluid suitable for the shale gas old area infill wells as claimed in claim 1, wherein the flexible deformation particles are a mixture of a modified organic gel polymer and an oil-based asphalt plugging material.
9. The plugging while drilling leakproof oil-based drilling fluid suitable for shale gas old zone infill wells as claimed in claim 1, wherein the weighting agent is barite or limestone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911215164.5A CN111100614A (en) | 2019-12-02 | 2019-12-02 | While-drilling plugging leak-proof oil-based drilling fluid suitable for shale gas old area encrypted well |
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| CN201911215164.5A CN111100614A (en) | 2019-12-02 | 2019-12-02 | While-drilling plugging leak-proof oil-based drilling fluid suitable for shale gas old area encrypted well |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113444503A (en) * | 2021-08-09 | 2021-09-28 | 中国石油化工集团有限公司 | Drilling wall reinforced rock gas reservoir oil-based high-temperature high-density drilling fluid |
| CN115678519A (en) * | 2021-07-22 | 2023-02-03 | 中国石油天然气股份有限公司 | Oil-based drilling fluid, preparation method and application thereof |
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| CN113444503A (en) * | 2021-08-09 | 2021-09-28 | 中国石油化工集团有限公司 | Drilling wall reinforced rock gas reservoir oil-based high-temperature high-density drilling fluid |
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