Deepwater high-density drilling fluid capable of resisting high temperature of 220 DEG C

A drilling fluid and high-density technology, which is applied in the field of drilling fluid for oil drilling, can solve the problems affecting the rheology and filtration performance of drilling fluid, weakening the anti-pollution ability of the system, and degrading the water solubility of treatment agents, etc., to achieve the purpose of suppressing gas Strong hydrate capacity, good lubricating effect, and low filtration loss

Inactive Publication Date: 2020-02-21
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conditions of low temperature and inclined wells in the seawater section change the rheology of the drilling fluid in the riser, which can increase the viscosity and density of the drilling fluid and produce a gel effect. High frictional resistance is generated in the wellbore flow and the formation at the casing shoe is compressed. The risk of leakage increases, causing high-temperature degradation and cross-linking of part of the treatment agent in the drilling fluid, weakening the anti-pollution ability of the system, making the water solubility of the treatment agent worse, affecting the rheology an

Method used

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  • Deepwater high-density drilling fluid capable of resisting high temperature of 220 DEG C

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Experimental program
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Effect test

Embodiment 1

[0029] A deep-water high-density drilling fluid resistant to high temperatures of 220°C includes the following components in mass percentages: 100 parts of seawater; 0.2 parts of soda ash; 0.3 parts of caustic soda; 1.5 parts of bentonite;

[0030] 0.3 parts of flow regulator, the flow regulator is prepared by mixing nano-montmorillonite and lithium magnesium silicate, the ratio of nano-montmorillonite: lithium magnesium silicate is 1:5;

[0031] The thickening and cutting agent is 3.0 parts of temperature-sensitive associative polymer;

[0032] 8.0 parts of anti-high temperature fluid loss reducer, made by mixing sulfonated lignite resin: sulfomethyl phenolic resin, drying at 105°C, and grinding into 200-mesh powder. The ratio of sulfonated lignite resin: sulfonated phenolic resin is 2: 3;

[0033] 4.0 parts of high-temperature anti-collapse agent, one of sulfonated asphalt and emulsified asphalt;

[0034] 15.0 parts of hydrate inhibitors are prepared by mixing thermodynami...

Embodiment 2

[0038] A deep-water high-density drilling fluid resistant to high temperatures of 220°C includes the following components in mass percentages: 100 parts of seawater; 0.2 parts of soda ash; 0.3 parts of caustic soda; 1.5 parts of bentonite;

[0039] 0.3 parts of flow regulator, made by mixing nano-montmorillonite and lithium magnesium silicate, the ratio of nano-montmorillonite: lithium magnesium silicate is 1:5;

[0040] The thickening and cutting agent is 2.5 parts of temperature-sensitive associative polymer;

[0041] 8.0 parts of anti-high temperature fluid loss reducer, made by mixing sulfonated lignite resin: sulfomethyl phenolic resin, drying at 105°C, and grinding into 200-mesh powder. The ratio of sulfonated lignite resin: sulfonated phenolic resin is 2: 3;

[0042] 3.0 parts of high-temperature anti-collapse agent, one of sulfonated asphalt and emulsified asphalt;

[0043] 15.0 parts of hydrate inhibitors are prepared by mixing thermodynamic inhibitors sodium chlori...

Embodiment 3

[0047] A deep-water high-density drilling fluid resistant to 220°C high temperature includes the following components in mass percentage: 100 parts of seawater; 0.2 parts of soda ash; 0.3 parts of caustic soda; 1.5 parts of bentonite; It is prepared by mixing lithium magnesium oxide, and the ratio of nano-montmorillonite: lithium magnesium silicate is 1:5;

[0048] The thickening and cutting agent is 2.0 parts of temperature-sensitive associative polymer;

[0049] 5.0 parts of anti-high temperature fluid loss reducer, made by mixing sulfonated lignite resin: sulfomethyl phenolic resin, drying at 105°C, and grinding into 200 mesh powder. The ratio of sulfonated lignite resin: sulfonated phenolic resin is 2: 3;

[0050] 2.0 parts of high-temperature anti-collapse agent, one of sulfonated asphalt and emulsified asphalt;

[0051] 15.0 parts of hydrate inhibitors are prepared by mixing thermodynamic inhibitors sodium chloride and potassium formate, and the ratio of sodium chlorid...

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Abstract

The invention discloses a deepwater high-density drilling fluid capable of resisting a high temperature of 220 DEG C, wherein the drilling fluid comprises: 100 parts of seawater, 0.1-0.2 part of sodaash, 0.2-0.3 part of caustic soda, 1.2-1.5 parts of bentonite, 0.2-0.3 part of a flow type regulator, 2.0-3.0 parts of a tackifying and shear strength improving agent, 5.0-8.0 parts of a high-temperature-resistant filtrate reducer, 2.0-4.0 parts of a high-temperature anti-collapse agent, 15.0-20.0 parts of a hydrate inhibitor and 420-650 parts of a weighting agent. According to the invention, thedeepwater high-density drilling fluid has good sedimentation stability, good rheological property, good water loss wall-building property and other properties under high-temperature conditions, and meets the exploration and development of deepwater high-temperature and high-pressure wells.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid for petroleum drilling, and in particular relates to a deep-water high-density drilling fluid resistant to high temperatures of 220°C. Background technique [0002] Deepwater drilling generally refers to areas where the water depth exceeds 900 meters in offshore operations. Among them, offshore operations when the water depth is greater than 1,500 meters are called ultra-deepwater drilling. In recent years, with the increasing proportion of offshore oil reserves, offshore oil exploration has gradually developed into deep water areas. However, various complex problems caused by water depth problems have brought more serious challenges to drilling and completion. [0003] Deepwater development wells further narrow the drilling window and require higher drilling fluids. The depth of deep water is relatively large, the upper rock cover is replaced by seawater, the pressure of the overlying f...

Claims

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Application Information

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IPC IPC(8): C09K8/16C09K8/24
CPCC09K8/16C09K8/24C09K2208/12C09K2208/22C09K2208/34
Inventor 李中吴志明余意徐一龙彭巍杨玉豪陈江华董钊向兴金许亮斌
Owner CHINA NAT OFFSHORE OIL CORP
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