Directional Drilling - Oil and Gas Wells

A: Chloride SCC targets high-strength steels and not elastomers, rotor steel sees wear but not embrittlement at typical motor temperatures, aromatic swelling changes elastomer modulus and kills differential pressure capability, HIC is tied to sour service steel and not motor elastomer life.

A: More WOB deepens stick-slip and distorts toolface control, lower flow starves the motor and worsens torque oscillations, higher RPM with controlled WOB smooths motor output and stabilizes slide response, reaming delays progress and doesn't address the dynamic imbalance causing the drop.

A: Immediate rejection ignores field repeatability limits, correction factors without validation introduce bias, consistency against a reference confirms usable precision for trajectory control, magnetic surveys reintroduce interference risks in cased or BHA-heavy sections.

A: Thicker carbon steel still erodes rapidly under sand loading, aluminum-bronze trades strength for magnetics and wears fast, carbide hardfacing resists erosive particle impact at blade contact points, duplex stainless addresses corrosion and not abrasive wear rate.

A: More bend raises side force and worsens DLS, longer slides compound curvature over distance, lower WOB with shorter slides tempers side loading and rotary sections smooth the wellbore, heavier mud increases drag and doesn't directly limit curvature.

A: Blind acceptance misses transient effects, ignoring azimuth hides magnetic or gyro drift, checking time alignment and stability ensures the survey reflects static conditions, circulating changes sensor response and invalidates pump-off intent.

A: Higher yield steels remain vulnerable to sulfide cracking, CRAs mitigate sulfide stress cracking at critical stressed areas, thicker walls don't change cracking susceptibility, aluminum reduces weight but performs poorly in sour environments.

A: More WOB increases contact force and drag, lubrication and cleaning address cuttings beds driving torque rise, sharp RPM jumps risk vibration, bit changes don't fix friction-driven torque trends.

A: Blindly proceeding embeds a steering bias, unilateral plan updates skip tool qualification, a test section with formal change control aligns model to reality and manages trajectory risk, manual steering negates RSS value and raises wellbore quality risk.