The Lateral Entry Guidance System technology is an intelligent method of navigating through the junctions of a multilateral well using Coiled Tubing.

The technology works equally well in cased and open-hole junctions without the need of sophisticated and expensive selective entry jewellery. The tool is slender enough to pass through production tubing and most completion restrictions and functions in all typical casing/liner diameters.

As LEGS technology itself has been presented in different forums before, the sole purpose of this paper is to present the particular conditions encountered in the Western Kazakhstan oilfields and methods used to make this technology work at depths over 5000 m.

The reasons behind the unsuccessful attempt to stimulate one well followed by a very successful stimulation of another well using LEGS bottom hole assembly will be showcased.

The result was a verification of a well design and operating philosophy against the alternative techniques of completion based selective entry. The outcome was the best producing well of the Karachaganak oilfield to date.

The paper will help potential users understand the challenges they may encounter and eventually, determine them to tailor their field development strategy in order to eliminate these problems and facilitate the use of LEGS.

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