How To Choose Oil Drilling Additives

When choosing oil drilling additives, the following key factors need to be considered:

Performance requirements of drilling fluid: The performance of drilling fluid is crucial to the efficiency and safety of drilling operations. Common additives include clay stabilizers, flocculants, fluid loss reducers, anti-collapse agents, lubricants and bactericides. These additives are used to prevent clay particle dispersion, improve solid phase control effect, reduce fluid loss, enhance wellbore stability, reduce drill friction and prevent microbial contamination.

Specific role of additives:

Clay stabilizer: Prevent clay particles from dispersing and settling, and enhance drilling fluid stability.

Flocculant: Promote solid phase particle agglomeration and improve solid phase control effect.

Fluid loss reducer: Reduce the fluid loss of drilling fluid in permeable formations and keep the drilling fluid stable.

Anti-collapse agent: Prevent wellbore collapse and enhance wellbore stability.

Lubricant: Reduce drilling tool friction resistance, increase drilling speed and extend drilling tool life.
‌Bactericide‌: Prevents the growth of microorganisms and maintains the cleanliness of drilling fluid‌.
‌Special additives‌: Such as sodium carboxymethyl cellulose (CMC), which has thickening, suspension and lubrication properties, is suitable for various downhole conditions and improves the stability and lubricity of drilling fluid‌. In addition, CMC can enhance the suspension of drilling fluid, improve the chip carrying effect, and reduce drill wear‌.

‌Additive selection criteria‌:

‌Environmental adaptability‌: Select additives that can adapt to different temperatures and salinities to ensure stability under various downhole conditions.
‌Effect evaluation‌: Through experiments and field tests, evaluate the specific improvement effect of additives on drilling fluid performance.
‌Cost-effectiveness‌: Comprehensively consider the effect, service life and maintenance cost of additives, and select products with high cost performance.