The Daily Drilling Report (DDR) is the official operational record for a drilling well, documenting every activity, measurement, and observation over a 24-hour reporting period. It is the single most important document in well construction — used by operators, service companies, regulators, and partners to track progress, analyze performance, allocate costs, and establish legal records. A typical well generates 30 to 120 DDRs over its drilling lifecycle, and these reports collectively form the permanent operational history of the wellbore.
Key Sections of a DDR
A standard DDR contains the following sections, though formats vary by operator:
- Header — Well name, API number, rig name, operator, contractor, spud date, current depth (MD/TVD), hole size, casing status, days since spud.
- Operations Summary — Narrative description of the day's activities in chronological order. Written by the company man or drilling supervisor.
- Activity Breakdown (Time Log) — Every activity classified by code with start/end times, depth interval, and duration. This is the basis for KPI calculation and cost allocation.
- Depth Summary — Footage drilled, current MD and TVD, footage by phase (surface, intermediate, curve, lateral).
- BHA Description — Current BHA configuration with component details, serial numbers, and cumulative footage/hours.
- Survey Data — MWD/gyro survey stations taken during the reporting period (MD, inclination, azimuth, DLS).
- Drilling Fluid (Mud) Properties — Weight, viscosity (funnel, PV, YP), fluid loss, pH, chlorides, solids content, MBT. Reported for each circulation cycle.
- Bit Record — Bit type, size, serial number, footage drilled, hours on bit, IADC dull grade at pull.
- NPT / Downtime — Any non-productive or invisible lost time, classified by cause code and responsible party.
- HSE / Safety — Safety meetings held, observations, incidents, near-misses, wellbore control events.
- Cost Summary — Daily cost estimate or actual charges by service line (rig, directional, fluids, casing, cementing, etc.).
Why It Matters in Oil & Gas Operations
The DDR serves multiple critical functions simultaneously. For operations teams, it provides the daily handoff between tours, ensuring continuity across crew changes. For drilling engineers, it is the primary data source for performance analysis — ROP trends, NPT classification, connection times, and tripping speeds are all derived from DDR data. For management, DDRs drive AFE tracking and cost variance reporting. And for legal and regulatory purposes, the DDR is the official record that may be subpoenaed in disputes or reviewed by regulatory bodies.
Poor-quality DDRs — missing times, inconsistent depth data, or vague narratives — can cost operators millions in misallocated charges, unidentified inefficiencies, and regulatory non-compliance. Industry studies estimate that 15 to 25% of drilling time is invisible lost time that only surfaces through rigorous DDR analysis.
How Netora Handles DDR Generation
Netora Drilling Intelligence auto-generates the Daily Drilling Report from operational data captured during the day — activity logs, survey data, mud checks, BHA records, and crew hours all flow into a structured DDR without manual re-entry. This eliminates transcription errors and ensures every report follows a consistent, auditable format. Learn more about Netora Drilling Intelligence.