Inertial Navigation Survey Systems

Inertial Navigation Systems (INSs) are capable of accurately measuring the position of boreholes e.g. the Ferranti Inertial Navigational Directional Surveyor (FINDS) and the Ring laser Inertial…

Wireline steering techniques

Wireline steering techniques

This technique has the advantage of real time readings from down hole, but the disadvantage of the wireline and associated handling problems.

Although technically wireline steering tools are also MWD…

Horizontal well surveying

High inclination wells (above 70°) and specially horizontal wells have specific difficulties for obtaining accurate surveys. Two main problems arise with high inclination surveying:

  • getting wireline…

Wireline Surveying Techniques

Most directional survey tools take surveys at discrete directional survey stations, with manual input of the wireline depth. The standard instrumentation on a wireline unit is the Gearhart Owen…

Slim hole, coiled tubing and under-balanced drilling surveying

Since the mid eighties there has been an interest in drilling wells with smaller hole sizes, typically 4-1/8", 4-3/4" or 5-7/8" hole sizes, with the smaller holes taking a 3-1/2" liner.

1. Slim hole…

Directional drilling plan with hole opener and under-reamer

This article describes an example of a directional drilling plan. The hole will be kicked-off  below the 26" conductor shoe. The hole will be directionally drilled to the 18 5/8" casing setting…

Directional Drilling Exercices

Directional Drilling no.1

After a survey in a deviated well it is apparent that the target will be missed. A correction run must be made but it is uncertain whether the target can be reached within…

Directional drilling plan with 12.25" pilot hole, 22" hole hole opener and 24" underreamer

This article describes an example of a directional drilling plan. The hole will be kicked-off  below the 26" conductor shoe. The hole will be directionally drilled to the 18 5/8" casing setting…

Definition of Surveying Terms

Definition of Surveying Terms from accelerometer to wireline