What are the different types of oil-based mud?

As a completion fluid (during perforating and workovers), there are three types of oil-based muds in common use: Conventional all-oil muds have oil as the external phase but are designed to be water-free when formulated or used. The first, called “oil mud,” has 95-100% of its liquid phase oil, with 0-5% unintentional water.

What is OBM oil based mud?

OBM oil-based mud requires special chemical additives to ensure that the emulsion is extremely stable and can withstand conditions of high temperature and contaminants. Oil mud products must be dispersible in the external oil phase. We believe you might also like this article (Baroid Drilling fluids).

What are the chemical additives in OBM oil-based mud?

We believe you might also like this article (Baroid Drilling fluids). The major OBM oil-based mud chemical additives that will be discussed in this article are: calcium soaps are the primary emulsifier in oil muds. These are made in the mud by the reaction of lime and long-chain (C-16 to C-22) fatty acids.

What is oil based mud?

Oil-based mud Asphaltic fluid loss additives – generally consist of Gilsonite or asphalt derivatives. Gilsonite has high-temperature stability (400°F), whereas asphalt is not as temperature stable (350°F). High concentrations of Gilsonite can cause excessive viscosity and gelation of the mud. The treatment level will not usually exceed 8 lb/bbl.

Can oil based drilling mud be damaged?

We may add water and special viscosifiers (organically treated bentonite) to increase viscosity. Only the oil phase in oil-based drilling fluids is free to form a filtrate, making an oil-based mud suitable for formations we must not damage. The fluid loss is generally minimal with drilling OBMs (less than 3cc at 500 psi and 300 degrees F).

Can oil be used in drilling mud?

Modern oil-based fluids use low-toxicity base oils and various chemical additives to build good properties. The use of oil in the drilling mud does have several disadvantages: Detection of Kicks is more difficult due to gas solubility in a base oil. However, for some applications, oil-based muds are very cost-effective. These include: