SLBM-GLA Drilling Fluid System

1.Composition

‌Primary additives‌:Freshwater system compound (SLBM), Modified asphalt (GLA), Anti-caving drilling fluid additive (GPC), ‌Supplementary materials‌: Viscosifiers (e.g., CMC-HV or salt-resistant polymer STQ), Sealing agent (SFD-1), Barite (weighting agent) ‌

2.Base Formula

1 m³ freshwater + 30–50 kg SLBM + 10–20 kg GLA

3.Performance Parameters

Refer to Table 1 for standardized test results:

4.Key Features

（1）Superior rheology‌: Enhances cuttings transport and minimizes borehole wall cake adhesion.

（2）High drilling efficiency‌: Reduces torque and drag through optimized fluid dynamics.

（3）Simplified preparation‌: Streamlined mixing protocol ensures operational efficiency

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5.Mixing Procedure

（1）Add SLBM, GLA, and GPC sequentially to freshwater.

（2）Agitate for 20–30 minutes until homogeneous dispersion is achieved.

6.Application Scope

.Ideal for ‌unconsolidated formations‌ and ‌fractured strata‌ in wireline core drilling operations.

.Widely implemented in ‌precious/base metal exploration‌ (e.g., Au, Pb, Fe deposits)

7. Operational Guidelines

（1）Use standard SLBM-GLA formulation in stable lithologies.

（2）For ‌permeable‌ or ‌heavily fractured zones‌:

（3） Increase GLA/GPC dosage proportionally to mud loss severity.

（4）Supplement with SFD-1 for enhanced wellbore stability