Base liquid of synthetic base drilling fluid

Abstract

The invention discloses base liquid of synthetic base drilling fluid, which comprises the following raw materials, such as limonene, bipentene, butylcellosolve, alkyl polyglucoside, alcohol ether carboxylate, white oil and dimethyl silicon oil. The base liquid combines the advantages of an ether group and alpha-olefin base liquid, makes up the defects of a single component and has little influence of viscosity by the change of temperature and wide application range; the selected raw materials almost do not contain aromatic hydrocarbon and have lower cost; and the base liquid of the synthetic base drilling fluid not only has low production cost but also has good biodegradation performance and environmental friendliness, can adapt to the wide acid-base condition and has favorable surface activity, lubricating performance and chemical stability.

Description

technical field [0001] The invention relates to a base fluid of a synthetic base drilling fluid. Background technique [0002] Synthetic-based drilling fluids emerged when water-based drilling fluids cannot meet the performance requirements of downhole complex conditions, and oil-based drilling fluids and mineral oil-based drilling fluids cannot meet environmental protection requirements. As soon as the synthetic base drilling fluid appeared, it showed a good development prospect and achieved remarkable environmental and economic benefits. [0003] Base fluid is the main component of drilling fluid, and its performance indicators determine most of the performance indicators of drilling fluid, such as flash point, viscosity and freezing point. At present, the base fluids of synthetic-based drilling fluids can be divided into three types: ester-based, ether-based, and α-olefin. Made of similar components, so the performance is single. Drilling fluids made of ester-based and...

AI Technical Summary

Problems solved by technology

At present, the base fluids of synthetic-based drilling fluids can be divided into three types: ester-based, ether-based, and α-olefin. Made of similar components, so the performance is single

Drilling fluids made of ester-based and ether-based base fluids have the following main disadvantages: First, the active carboxyl groups in the base fluid molecules are easily damaged by alkaline or acidic substances to generate alcohols and carboxylic acids. Therefore, during drilling, The intrusion of acid gas will lead to ester hydrolysis, which will affect the stability of drilling fluid. Second, when drilling offshore wells, the drilling fluid may drop to around 4°C due to the cooling effect of seawater after the pump is stopped. At such a low temperature, the drilling fluid Can become too thick, causing pump pressure to rise, causing downhole complications such as formation fractures and wellbore instability

Drilling fluids made of α-olefin base fluids have lower viscosity than ester-based and ether-based fluids, thus solving the problem of high low-temperature viscosity of drilling fluids, but the ensuing problem is that the viscosity of drilling fluids is low, making drilling Fluid rheological properties are significantly affected by temperature and pressure, leading to problems such as wellbore purification, barite settlement, and high cycle pressure loss

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