What are the differences between water-based mud and oil-based mud of KOSUN drilling waste management?

Feb 07, 2020

What are the differences between water-based mud and oil-based mud of KOSUN drilling waste management?
 
Main ingredients of water-based mud: water, alkalinity regulator, fluid loss reducer, flocculant, coating agent, inhibitor, lubricant, anti-sagging agent, flow pattern regulator, oil retention material, plugging material, soil powder , Weighting, etc.
 
Oil-based mud is mainly divided into two categories: one is oil phase drilling fluid, which is a mixture of oxidized asphalt, organic acids, alkalis, stabilizers and high flash point diesel oil. Generally contains 3% -5% water. The other is a water-in-oil emulsified drilling fluid. Various additives are used to emulsify and stabilize water. This system has a maximum water content of 50%.
 
The advantages of oil-based mud: strong inhibition, temperature resistance, lubricity, strong anti-pollution ability, oil layer protection, fast mechanical drilling speed.
 
Disadvantages of oil-based mud: expensive, difficult to handle leaks, poor resistance to water invasion, large impact on cementing and electrical measurement, environmental issues (inconvenient discharge), unsuitable for drilling gas-containing exploration wells
 
The advantages of water-based mud: it has the advantages of low cost, simple configuration and maintenance, wide sources of treatment agents, multiple types to choose from, and easy control of performance. It also has a good effect of protecting oil and gas layers. Drilling fluid system commonly used in open gas reservoirs.
 
Disadvantages of water-based mud: it is easy to cause blockage, and the shale interval itself has a low permeability and changes in productivity; when water-based mud is used in the drilling process, shale itself is a brittle mineral that swells with water and easily causes the wellbore to collapse , Affecting the quality of drilling;
 
Compared with water-based mud, oil-based mud has many advantages such as good lubricity, stable borehole wall, no damage to oil and gas layer, temperature resistance, salt resistance, and calcium invasion.