SUMMARY

During the years 1989 and 1990 LAGOVEN, S.A.. developed three horizontal well projects in Lake Maracaibo, TJ-1095, projects in Lake Maracaibo, TJ-1095, CLA-2273 and TJ-1112. In these wells an operational geological follow-up was made in order to define accurately the different structural depths of the geological column to be penetrated, and especially the structural depth (from top to base) of the different sands to be found at the reservoir target by using: geological correlations in a real time, cutting sample and up-dating the projection of the directional survey projection of the directional survey section.

The experience gained in the horizontal wells proved to be of incalculable value as it helped establish a geological- operational procedure which can serve as a basis for future operational projects.

Introduction

In recent years horizontal wells have gained great importance. This new technology presents different applications which go from minimizing water and/or gas coning problems to the exploitation of naturally fractured oil reservoirs. Among the fundamental objectives defined by LAGOVEN S.A. in the horizontal well projects in Lake Maracaibo were: projects in Lake Maracaibo were: Evaluate new technology Increase production rate Reduce the drilling activity at the surface of the lake.

The goal of this work is to describe the methodology used in the drilling projects of horizontal wells which will then give support and experience for future projects. projects. The horizontal wells TJ-1095 and TJ-1112 are located in the area "Eoceno Oeste" of the Tia Juana field in the B-6-X.22 and B-7-X.14 reservoirs and well CLA-273 is found in the "Lago Central" in the C-2-X.08 reservoir (Fig. 1).

Background

In the past, directional drilling was used as a technique to solve operational problems, i.e. tools left in the hole, problems, i.e. tools left in the hole, correction of the well trajectory in relation to the original direction, relief wells, etc. The present directional drilling techniques are applicable, not only in the solution of the above mentioned problems but also in the drilling of directional wells (drilling groups of wells using the same platform) and horizontal wells.

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