What is the use of rat hole equipment in drilling technology?

Answer 1

There is no rat hole equipment. A rat hole is a section of the well drilled to allow the entry of electric logging equipment or for use as a space to drop perforating guns inot leaving the perforated zone free of obstruction

If your are talking about the equipment to drill the rat hole for the conductor pipe, mobile auger rigs are used to drill a 24 to 30 diameter shaft 40 to perhaps 250 feet deep. A conductor pipe is then set in the drilled hole to the design depth and grouted to fill the annulus and seal the conductor pipe with the surrounding soil/rock. This process is particularly critical in gas well production and in some parts of the country require deeper conductors to improve safety and provide the necessary foundation for the oil/gas well rig and the blow-out prevention (BOP) devise that can be quiet large and heavy.

In some areas, like Western Colorado, where the desire to minimize the environmental impact of well site development is growing, some operators may install as many as 24 conductor pipes on a single location for directional drilling.