Contribution to the Study on the Possibility of the Development of the Upper Cenomanian Reservoir of the Tshiende Field

Abstract

In order to carry out hydrocarbon production in the basement, a drilling must be carried out and the latter crosses several layers or formation until reaching the desired objective. At the beginning of the production, the well will have a natural pressure and the oils in a reasonable quantity which will allow to make an exploitation but over time the pressure decreases and the production of oil leaves room for the production of water to show the end oils and in most cases this well is converted from producing well into an injector well to feed other wells or repackage. In fact, the Tshiende field comprises three reservoirs (Cenomanian, Pinda and Vermelha) that produce and the Cenomanian only produces in its lower horizon. The entire well passes through the Cenomanian reservoir to reach the other two reservoirs. To contribute to the understanding of the geological complexity of the reservoirs of this field, we focused our study on the Cenomanian reservoir. This reservoir did not produce in its superior horizon in the Cenomanian after several tries, but Produces in other fields that the Tshiende field, and that sometimes constitutes the main reservoir in the field Muanda. A new production test in the Ts-27 well began on 02/01/2019 in the Cenomanian dedicated upper part using other technique than the previous ones. This has had to prove the feasibility of producing this unknown reservoir. The decision was made to re-evaluate the UC potential and to propose wells to perforate to depend on their positions and history. After an extensive review of Tshiende's potential for superior Cenomanian production, a development program is proposed. Four workovers are proposed to develop the higher Cenomanian potential in the TS-29, TS-22, TS-02 and TS-13 wells.