Issue 31/2015 - Localization of deepwater drilling fluid additives

Recently, the Qingdao Institute of Bioenergy and Process Research, Chinese Academy of Sciences has developed a new deepwater drilling fluid additive, breaking the monopoly of similar foreign products and providing technical support
for accelerating the exploration and development of resources in the South China Sea.

The Energy Application Technology Branch of Qingdao Energy Institute has developed three additives
: shale inhibitor, low relative molecular weight drilling chip coating agent and high-efficiency anti-mud coating lubricant.
In the past, such additives in China mainly relied on imports, which limited the development of marine deepwater exploration well work in
China.

The performance of drilling fluids mainly depends on a variety of high-performance functional additives
.
The three high-performance additives successfully developed this time have broken through the technical difficulties faced by deepwater well drilling
, such as low operating temperature, dispersion of shale hydration, narrow safety density window, and serious gas hydrate.
Among them, shale inhibitors can inhibit the hydration and dispersion of shale and maintain good rheological properties of mud.
The function of the drill cuttings coating agent is to adsorb on the surface of the drill cuttings and inhibit the hydration and dispersion of the drill cuttings, so that the drill cuttings can maintain a good initial shape and be carried to the ground; The function of anti-mud coating lubricant is to form a stable protective film on the surface of drill bits and drilling tools, prevent mud bags of drill bits and drilling tools, effectively reduce friction and torque, and improve drilling time
.

The drilling fluid formulated with these three treatment agents as the main agent and other functional materials has the characteristics of
stable low temperature rheological performance, strong inhibition and good lubricity.
Its performance has reached ≥ 90% of the anti-expansion rate, the rolling recovery rate of shale ≥ 90%, and the lubricity of drilling fluid ≥ 80%, which has reached the standard of similar foreign products and has great cost advantages, and has been successfully applied to more than 20 wells
in the South China Sea Liuhua Oilfield and other oilfields.

(Chemical)