Require drilling fluid to protect oil gas reservoirs

Drilling fluid is the "blood" of drilling plays a very important role in drilling operations. Therefore, the requirements for drilling fluid are high, mainly in four aspects:

Drilling mud additives

Drilling cycle requirements

The requirements for drilling fluid are low viscosity, strong sand carrying capacity, low static shear force, good lubrication performance, low friction. There are few solid particles.

Keep the wellbore stable.

Drilling achieves a balance between the use of drilling fluid pressure columns formation pressure through the formation, resulting in stable drilling fluid density; The density of drilling fluid is balanced by the pressure column of drilling fluid to balance oil gas pressure. Drilling fluid is necessary to overcome unstable formations.

Require drilling fluid to protect oil gas reservoirs

In order to prevent drilling fluid causing damage to oil gas reservoirs, it is required that the water loss of the drilling fluid be small. Thin mud cake (after the drilling fluid loses water, the drilling fluid forms a solid pressure difference in the wellbore solid particles form a mud cake ring), with low solid content low hydration degree of the filtrate (after the filtrate enters the formation).

pivotal role

The harsh environment of underground drilling operations promotes the research development of drilling fluids, requiring the completion of the following key tasks during the drilling process: suspension, pressure control, rock stability, buoyancy, lubrication, cooling.