CN110819318A - Deepwater high-density drilling fluid capable of resisting high temperature of 220 DEG C - Google Patents
Deepwater high-density drilling fluid capable of resisting high temperature of 220 DEG C Download PDFInfo
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- CN110819318A CN110819318A CN201910981459.7A CN201910981459A CN110819318A CN 110819318 A CN110819318 A CN 110819318A CN 201910981459 A CN201910981459 A CN 201910981459A CN 110819318 A CN110819318 A CN 110819318A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/22—Hydrates inhibition by using well treatment fluids containing inhibitors of hydrate formers
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
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- General Life Sciences & Earth Sciences (AREA)
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- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a deepwater high-density drilling fluid capable of resisting the high temperature of 220 ℃, which comprises the following components: 100 parts of seawater, 0.1-0.2 part of soda ash, 0.2-0.3 part of caustic soda, 1.2-1.5 parts of bentonite, 0.2-0.3 part of flow pattern regulator, 2.0-3.0 parts of tackifying and shearing agent, 5.0-8.0 parts of high temperature resistant filtrate reducer, 2.0-4.0 parts of high temperature anti-collapse agent, 15.0-20.0 parts of hydrate inhibitor and 420-650 parts of weighting agent. The deepwater high-density drilling fluid capable of resisting the high temperature of 220 ℃ has good sedimentation stability, rheological property, water loss wall building property and the like under the high temperature condition, and meets the exploration and development of deepwater high-temperature and high-pressure wells.
Description
Technical Field
The invention belongs to the technical field of drilling fluid for petroleum drilling, and particularly relates to a deep water high-density drilling fluid capable of resisting a high temperature of 220 ℃.
Background
Deep water drilling generally refers to areas where water depths exceed 900 meters in offshore operations. Among them, offshore operations when the water depth is more than 1500 m are called ultra-deep water drilling. In recent years, with the increasing of the exploitation proportion of the offshore oil reserves, the offshore oil exploration gradually develops towards a deepwater area. However, the various complex problems due to water depth problems present more serious challenges to drilling and completing the well.
Deep water well development causes the drilling window to be further narrowed, and the requirement on drilling fluid is higher. The deep water is deeper, the upper rock covering layer is replaced by seawater, the overlying stratum pressure is extremely low, the rocks are loose in cementing, the collapse pressure is high, the leakage pressure is low, the drilling window is further narrowed compared with the conventional deep well, the drilling fluid is used for preventing well wall rocks from collapsing, well leakage and well control problems need to be prevented, and the difficulty is higher than that of the conventional deep well.
High temperature and high pressure drilling fluids for deepwater development wells face the dual challenges of "high temperature and low temperature co-existence". The rheological property of the drilling fluid in the marine riser is changed under the condition of low-temperature inclined well in the seawater section, the viscosity and the density of the drilling fluid are increased, the gel effect is generated, the higher friction resistance is generated when the drilling fluid flows in a shaft, the risk of stratum pressure leakage at the position of a casing shoe is increased, part of treating agent in the drilling fluid is subjected to high-temperature degradation and crosslinking, the anti-pollution capacity of a system is weakened, the water solubility of the treating agent is deteriorated, the rheological property and the filtration loss performance of the whole drilling fluid are influenced, the whole system is collapsed seriously, the well leakage caused by the gel effect of the drilling fluid in the low-temperature section is prevented, and the reduction of the rock carrying capacity caused by the degradation of the drilling fluid in. The deep water high-temperature high-pressure development well water-based drilling fluid system with the temperature resistance of about 180 ℃ and the specific gravity of about 2.1 is popularized and applied in a large area and is blank for domestic research. A set of drilling fluid system suitable for the deep-water high-temperature high-pressure development well in south China sea is urgently needed to be developed.
Disclosure of Invention
The invention aims to provide a deepwater high-density drilling fluid capable of resisting the high temperature of 220 ℃, which has better hydrate inhibition capacity under the conditions of low temperature and high pressure, has better rheological property, sedimentation stability, water loss wall building property, lubricating property and the like under the condition of high temperature, and meets the exploration and development of a high-temperature deepwater well reservoir.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ is characterized by comprising the following components: 100 parts of seawater, 0.1-0.2 part of soda ash, 0.2-0.3 part of caustic soda, 1.2-1.5 parts of bentonite, 0.2-0.3 part of flow pattern regulator, 2.0-3.0 parts of tackifying and shearing agent, 5.0-8.0 parts of high temperature resistant filtrate reducer, 2.0-4.0 parts of high temperature anti-collapse agent, 15.0-20.0 parts of hydrate inhibitor and 420-650 parts of weighting agent;
the preparation method of the deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ comprises the following steps:
firstly, putting seawater into a 10000 r/min high-speed stirrer, and putting the prehydrated bentonite and stirring for 5 minutes;
adding soda ash and caustic soda and stirring for 2-5 minutes;
adding flow pattern regulator and viscosity increasing and cutting agent, stirring for 5-20 min and dissolving completely;
then adding the high-temperature resistant filtrate reducer and the high-temperature anti-collapse agent and stirring for 5-20 minutes;
adding hydrate inhibitor and stirring for 5-20 min;
finally adding weighting agent and stirring for 5-20 minutes;
after all the component materials are added and completely mixed, stirring at high speed for 30 minutes at normal temperature and normal pressure.
Preferably, the flow pattern regulator is prepared by mixing nano montmorillonite and lithium magnesium silicate, and the ratio of the nano montmorillonite to the lithium magnesium silicate is 0.5-2.0: 5 to 8.
Preferably, the tackifying and shear-improving agent is a temperature-sensitive associative polymer, a crosslinking monomer is introduced into a polyacrylamide molecular structure to form a molecular chain structure with moderate crosslinking, and then a temperature-resistant temperature-sensitive monomer is introduced, so that intermolecular hydrophobic association is generated by utilizing the characteristic that the temperature rise promotes the association between temperature-sensitive groups, and the viscosity of the solution is raised.
Preferably, the high-temperature-resistant fluid loss additive is prepared by mixing sulfonated lignite resin and sulfomethyl phenolic resin, drying at 105 ℃, and grinding into 200-mesh powder, wherein the ratio of the sulfonated lignite resin to the sulfonated phenolic resin is 0.5-2: 3 to 5.
Preferably, the high-temperature anti-collapse agent is sulfonated asphalt or emulsified asphalt.
Preferably, the hydrate inhibitor is prepared by mixing a thermodynamic inhibitor sodium chloride and potassium formate, and the ratio of the sodium chloride to the potassium formate is 1.0-2.0: 3.0 to 5.0.
Preferably, the weighting agent is prepared by mixing 400-mesh barite and 250-mesh barite, and the ratio of the 400-mesh barite to the 250-mesh barite is 1: 3.
Compared with the prior art:
1. the temperature resistance reaches 220 ℃, the performance is stable, the fluidity is good, the filtration loss is small, the well wall stabilizing capability is strong, and the drilling detection requirement of the high-temperature deep water development well is met;
2. the sedimentation stability is good, which is beneficial to liberation of oil-gas layers and improves the productivity of oil-gas wells;
3. the gas hydrate inhibition capacity is strong, and the drilling requirement of a deep well can be met;
4. the lubricating effect is good, and the damage to a mud pump can be reduced;
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
The deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ comprises the following components in percentage by mass: 100 parts of seawater; 0.2 part of soda ash; 0.3 part of caustic soda; 1.5 parts of bentonite;
0.3 part of flow pattern regulator, wherein the flow pattern regulator is prepared by mixing nano montmorillonite and lithium magnesium silicate, and the mass ratio of the nano montmorillonite: the ratio of lithium magnesium silicate is 1: 5;
the tackifying and shear-promoting agent is 3.0 parts of temperature-sensitive associated polymer;
8.0 parts of high-temperature resistant filtrate reducer, which is prepared from sulfonated lignite resin: mixing sulfomethyl phenolic resin, drying at 105 ℃, and grinding into 200-mesh powder to obtain the sulfonated lignite resin: the proportion of the sulfonated phenolic resin is 2: 3;
4.0 parts of high-temperature anti-collapse agent, which is one of sulfonated asphalt and emulsified asphalt;
15.0 parts of hydrate inhibitor, which is prepared by mixing thermodynamic inhibitor sodium chloride and potassium formate, wherein the ratio of the sodium chloride to the potassium formate is 1.0: 3.0;
650 parts of weighting agent is prepared by mixing 400-mesh barite and 250-mesh barite, and the proportion of the 400-mesh barite to the 250-mesh barite is 1: 3.
The components are sequentially put into a high-speed stirrer of 10000 r/min according to the sequence, every time one component raw material is put into the high-speed stirrer to be stirred for 5 minutes, and after all the component raw materials are added and completely mixed, the high-speed stirrer is stirred for 30 minutes at normal temperature and normal pressure.
Example 2
The deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ comprises the following components in percentage by mass: 100 parts of seawater; 0.2 part of soda ash; 0.3 part of caustic soda; 1.5 parts of bentonite;
0.3 part of flow pattern regulator, which is prepared by mixing nano-montmorillonite and lithium magnesium silicate, wherein the mass ratio of the nano-montmorillonite is as follows: the ratio of lithium magnesium silicate is 1: 5;
the tackifying and shear-promoting agent is 2.5 parts of temperature-sensitive associated polymer;
8.0 parts of high-temperature resistant filtrate reducer, which is prepared from sulfonated lignite resin: mixing sulfomethyl phenolic resin, drying at 105 ℃, and grinding into 200-mesh powder to obtain the sulfonated lignite resin: the proportion of the sulfonated phenolic resin is 2: 3;
3.0 parts of high-temperature anti-collapse agent, which is one of sulfonated asphalt and emulsified asphalt;
15.0 parts of hydrate inhibitor, which is prepared by mixing thermodynamic inhibitor sodium chloride and potassium formate, wherein the ratio of the sodium chloride to the potassium formate is 1.0: 3.0;
650 parts of weighting agent, which is prepared by mixing 400-mesh barite and 250-mesh barite, wherein the proportion of the 400-mesh barite to the 250-mesh barite is 1: 3;
the components are sequentially put into a high-speed stirrer of 10000 r/min according to the sequence, every time one component raw material is put into the high-speed stirrer to be stirred for 5 minutes, and after all the component raw materials are added and completely mixed, the high-speed stirrer is stirred for 30 minutes at normal temperature and normal pressure.
Example 3
The deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ comprises the following components in percentage by mass: 100 parts of seawater; 0.2 part of soda ash; 0.3 part of caustic soda; 1.5 parts of bentonite; 0.3 part of flow pattern regulator; is prepared by mixing nano montmorillonite and lithium magnesium silicate, wherein the nano montmorillonite comprises the following components in percentage by weight: the ratio of the lithium magnesium silicate is 1: 5;
the tackifying and shear-promoting agent is 2.0 parts of temperature-sensitive associated polymer;
5.0 parts of high-temperature resistant filtrate reducer, which is prepared from sulfonated lignite resin: mixing sulfomethyl phenolic resin, drying at 105 ℃, and grinding into 200-mesh powder to obtain the sulfonated lignite resin: the proportion of the sulfonated phenolic resin is 2: 3;
2.0 parts of high-temperature anti-collapse agent, which is one of sulfonated asphalt and emulsified asphalt;
15.0 parts of hydrate inhibitor, which is prepared by mixing thermodynamic inhibitor sodium chloride and potassium formate, wherein the ratio of the sodium chloride to the potassium formate is 1.0: 3.0;
650 parts of weighting agent, which is prepared by mixing 400-mesh barite and 250-mesh barite, wherein the proportion of the 400-mesh barite to the 250-mesh barite is 1: 3;
the components are sequentially put into a high-speed stirrer of 10000 r/min according to the sequence, every time one component raw material is put into the high-speed stirrer to be stirred for 5 minutes, and after all the component raw materials are added and completely mixed, the high-speed stirrer is stirred for 30 minutes at normal temperature and normal pressure.
The performance test data of the drilling fluid prepared in each example after being subjected to thermal roll aging at 220 ℃ for 16 hours are shown in the following table:
in the above embodiments, the first embodiment is the best embodiment of the present invention, which has good settling stability after being aged for 16h at 220 ℃ under high temperature and hot rolling, and the drilling fluid prepared by the present invention has good rheological property and water loss wall building property, and can effectively carry rocks and form compact mud cakes to stabilize the well wall, thereby meeting the exploration and development of deep water high temperature and high pressure wells.
The above description is only an embodiment of the present invention, and the above illustration is not a limitation to the essence of the present invention, and one skilled in the art can modify or modify the above embodiment after reading the present specification without departing from the spirit and scope of the present invention.
Claims (7)
1. The deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ is characterized by comprising the following components: 100 parts of seawater, 0.1-0.2 part of soda ash, 0.2-0.3 part of caustic soda, 1.2-1.5 parts of bentonite, 0.2-0.3 part of flow pattern regulator, 2.0-3.0 parts of tackifying and shearing agent, 5.0-8.0 parts of high temperature resistant filtrate reducer, 2.0-4.0 parts of high temperature anti-collapse agent, 15.0-20.0 parts of hydrate inhibitor and 420-650 parts of weighting agent;
the preparation method of the deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ comprises the following steps:
firstly, putting seawater into a 10000 r/min high-speed stirrer, and putting the prehydrated bentonite and stirring for 5 minutes;
adding soda ash and caustic soda and stirring for 2-5 minutes;
adding flow pattern regulator and viscosity increasing and cutting agent, stirring for 5-20 min and dissolving completely;
then adding the high-temperature resistant filtrate reducer and the high-temperature anti-collapse agent and stirring for 5-20 minutes;
adding hydrate inhibitor and stirring for 5-20 min;
finally adding weighting agent and stirring for 5-20 minutes;
after all the component materials are added and completely mixed, stirring at high speed for 30 minutes at normal temperature and normal pressure.
2. The deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ as claimed in claim 1, wherein the flow pattern regulator is prepared by mixing nano-montmorillonite and lithium magnesium silicate, and the ratio of the nano-montmorillonite to the lithium magnesium silicate is 0.5-2.0: 5 to 8.
3. The deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ as claimed in claim 2, wherein the tackifying and shearing agent is a temperature-sensitive associative polymer, a cross-linking monomer is introduced into a polyacrylamide molecular structure to form a molecular chain structure with moderate cross-linking, and then a temperature-resistant temperature-sensitive monomer is introduced to generate intermolecular hydrophobic association.
4. The deep water high-density drilling fluid capable of resisting the high temperature of 220 ℃ according to claim 3, wherein the high-temperature-resistant fluid loss additive is prepared by mixing sulfonated lignite resin and sulfomethyl phenolic resin, drying at 105 ℃ and grinding into 200-mesh powder, and the ratio of the sulfonated lignite resin to the sulfonated phenolic resin is 0.5-2: 3 to 5.
5. The deepwater high-density drilling fluid resistant to the high temperature of 220 ℃ as claimed in claim 4, wherein the high-temperature anti-collapse agent is sulfonated asphalt or emulsified asphalt.
6. The deep-water high-density drilling fluid capable of resisting the high temperature of 220 ℃ according to claim 5, wherein the hydrate inhibitor is prepared by mixing thermodynamic inhibitors sodium chloride and potassium formate, and the ratio of the sodium chloride to the potassium formate is 1.0-2.0: 3.0 to 5.0.
7. The deepwater high-density drilling fluid capable of resisting the high temperature of 220 ℃ as claimed in claim 6, wherein the weighting agent is prepared by mixing 400-mesh barite and 250-mesh barite, and the ratio of the 400-mesh barite to the 250-mesh barite is 1: 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910981459.7A CN110819318A (en) | 2019-10-16 | 2019-10-16 | Deepwater high-density drilling fluid capable of resisting high temperature of 220 DEG C |
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| CN201910981459.7A CN110819318A (en) | 2019-10-16 | 2019-10-16 | Deepwater high-density drilling fluid capable of resisting high temperature of 220 DEG C |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113969149A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Compound weighting agent, high-temperature-resistant high-density drilling fluid, and preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113969149A (en) * | 2020-07-24 | 2022-01-25 | 中国石油化工股份有限公司 | Compound weighting agent, high-temperature-resistant high-density drilling fluid, and preparation method and application thereof |
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