ROGII

Modern drilling is a remote-controlled, blindfolded 3D underground navigation. Modern rigs use steerable drill bits.
A "horizontal well" starts by drilling vertically, but then gets curved and is maintained horizontally into the most oil yeilding layer. Keeping the TVT constant. (Z may change)
Hence an L-Profile., also called as a Horizontal Well. Video on Profiles.
Data is such that the layers including the a surface are exactly parallel surfaces.
- Almost parallel planes.
Purpose: Maintaining TVT to be constant. (Geosteering)
Objective: Making a model for predicting current TVT.
The Drill Bit has a Gamma Ray (GR) tool/sensor. Different rocks naturally emit different amounts of radiation (Gamma Rays).
- For example, "Shale" (which holds oil) emits high gamma rays, while "Limestone" emits low gamma rays.
A type well csv, is basically a lookup where GR vs TVT is mapped for a place.
- As found later, many wells share the sub sequence of a common type well.
Everything meassured from sea level is -ve.

Provided:

Type Well: A master map of gamma-ray signals vs TVT.
GR- Gamma Ray : Gamma Ray signal values sensed from the drill bit.
WELLNAME - Unique identifier for the well.
MD - Measured Depth (ft): Total length of all the pipe currently in the hole (Curve's Perimeter).
X, Y, Z - Treat them as standard 3D Cartesian coordinates (ft). (Global Reference)
ANCC, ASTNU, ASTNL, EGFDU, EGFDL, BUDA - Predicted depth of different types of layers.
- For the XYZ at what depth is the depth of the directly above ANCC: Check the value of ANCC for that row.
- Only in the training data.
TVT_input - Some initial values of TVT.

To Predict:

TVT: True Vertical Thickness
- Vertical: Along Gravity.
- A loosely used term in the oil industry. Doesn't mean this.
- Here, it means the depth of the drill bit from the ground surface.
- Know that ground surface isn't perpendicular to Z.

Sources:

🗺 Well Map

(python /scripts/map_viewer.py <well_name>)

A program for XY well plot, analyzing 3D proximity and parallelism, and projecting neighbor TVT mappings with RMSE metrics.

(python /scripts/well_viewer.py <well_name>)

A geosteering program with GR correlation, noise filtering, chunk-based anchoring, and multi-axis view support (TVD, TVT, and stratigraphic offset).

Well Names	Reason	Remark
059c8f24, 14ab73fb, eba6605e	Δ TVT is abrupt	Single row in each TW
4a335117	RMSE of Linear Regression	RMSE = 36, 2nd hightest = 24
1b1eba53, d7eb0be8, 81bf5923, 4c2208f5, 03a935ae, 727a3a10, a8ed028a	Empty ANCC	Whole column in HW
9dfff011	Empty EGFDL	Whole Column in HW
03a935ae, 1b1eba53, 4c2208f5, 4f3eb9e9, 727a3a10, 78a4a386, 81bf5923, a8ed028a, d7eb0be8, 5d7198fd, 6e9ccd38	Missing ANCC	in TW
86454a6f	Missing ANCC, ASTNU	in TW
0bbf5e67, 2cee0cba, 353e5502, 4f4ac5ce, 5aef5c6c, 5eae34a8, 99529c45, a87433c9, d60430e6, d00e7eb9, d90aa14c	Missing BUDA	in TW
761 out of 773 Wells	Different than 6 layers	in TW