ABSTRACT.

The overall economics of exploitation have been improved by adopting wider spacing between wells, and by the following means of increasing their productivity: proper well location; considerable amount of pressure maintenance by water injection from the very beginning of exploitation; increase of the injection pressure and of the draw-down; improvement of the hydrodynamic conditions; increase of the permeability around the well bore by various proeedures, particularly hydraulic fracturing. This has resulted in more than doubling the production during the past five years, and in setting the goal of 350 to 400 million tons annual praduction within the next 15 years. Research has been directed principally towards the improvement of hydrodynamics and geophysics: fluid flow, particularly for two or three phase systems; study of flow in heterogeneous formations; various methods of increasing oil recovery, including liquid gas and high-pressure gas displacements. The same trend of improved economics applies to gas wells, the salient feature being the reduction of the number of wells while increasing the production of each. This was achieved by better down-hole mechanical completion, and by drilling the wells into thick sections of high permeability. Interference between gas wells is not great, and this is why the wells are often located irregularly over the structure, in batteries or groups. Careful analysis of the production performance of a reservoir from its earliest life allows the formulation of its future development, both as to the regime of the wells already drilled, and as to the drilling of additional development wells.

RESUME.

On a amélioré l'efficacité économique d'une exploitation en augmentant la distance entre les puits et en accroissant leur rendement par les moyens suivants: emplacement rationnel des puits; maintien d'une pression considérable par injection d'eau dès le début de l'exploitation; augmentation de la pression d'injection et du draw-down; amélioration des conditions hydrodynamiques; accroissement de la perméabilité des zones avoisinant le trou de forage par diverses méthodes, particulièrement la rupture hydraulique dela couche. Ces mesures ont permis d'augmenter la production de plus du double en ces cinq dernières années et de se donner pour but la production annuelle de 350 à 400 millions de tonnes dans les quinze années à venir. Les efforts de recherches ont été dirigés principalement vers le perfectionnement des méthodes hydrodynamiques et géophysiques: écoulement des liquides, particulièrement pour des systèmes à deux ou trois phase

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