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

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...

Images