Oil Drilling

CHARING manufactures HPMC, RDP, and PCE for dry-mix mortar and concrete — supplying high quality products across Southeast Asia, the Middle East, South America and Africa for over a decade. We share what we know.

1. Two Jobs, One Polymer

HEC is used in two distinct parts of oil well construction:

Drilling fluid — the mud that carries cuttings up from the bit. HEC thickens the water phase and controls fluid loss.

Oil well cementing — the slurry pumped into the annular space between casing and rock. HEC controls fluid loss and prevents the cement from thinning out before it sets.

Both jobs need a polymer that survives salt, heat, and high pH.

2. Why HEC, Not HPMC

HEC is the standard thickener for water-based drilling fluids. The reason:

Property	HEC	HPMC
Salt tolerance	Good	Moderate
Temperature stability	Stable to ~80°C	Gels at 55–70°C
Calcium tolerance	Excellent	Moderate
Biodegradability	Moderate	Slower
Cost	Higher	Lower

For drilling muds and oil well cements that face salt brine, calcium, and downhole temperatures, HEC wins on stability. HPMC is cheaper and works in shallow, freshwater applications — but the high viscosity, salt tolerance, and thermal stability of HEC are unmatched for deep wells.

3. CHARING Grades for Oil Drilling

Grade	Viscosity	Typical use
HE 300	250–400 cps (1%)	Low-viscosity mud, fluid loss control, deep formation penetration
HE 100000	80,000–120,000 cps (2%)	High-viscosity mud, lost circulation pills, cementing spacer fluids

Low-viscosity (HE 300)

Used where the mud needs to flow easily — typically water-based drilling fluids in shallow to medium wells, and as a fluid-loss additive in cement. The low molecular weight means low friction pressure in the drill string.

High-viscosity (HE 100000)

Used where you need to plug fractures or carry heavy cuttings — lost circulation pills, and as the viscosity modifier in cement spacers. The high molecular weight builds viscosity at low dosage.

4. The Performance Demands

Drilling fluids are hostile to most polymers. The thickener must survive:

Salt (NaCl, KCl, CaCl₂) at saturation

Temperature up to 80–100°C downhole

High pH (10–12) from cement hydration and additives

Shear through the bit and up the drill string

Long exposure — days or weeks downhole

HEC handles all five. CMC (carboxymethyl cellulose, the older alternative) fails faster under calcium and salt. HEC is the modern choice.

5. Common Mistakes

1. Using HPMC in deep wells. HPMC gels at 55–70°C. A well bottom at 80°C kills the thickening. Use HEC for temperature stability.

2. Over-dosing. Excess thickener spikes viscosity, slows penetration, and increases pump pressure. Match dosage to the target viscosity and density.

3. Wrong grade. Low-viscosity fluids need HE 300. Lost circulation pills need HE 100000. Using the wrong grade means under- or over-performing.

4. Ignoring salt. If the formation has salt water, test with your actual brine concentration before specifying the HEC grade.

For technical support, free samples, or help with your drilling fluid formulation:

Shandong Charing Industry Co., Ltd.

Email: info@sdcharing.com

Website: www.sdcharing.com

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