The Study Of Horizontal Wells Developing Technique In Tight Sandstone Gas Reservoirs

Low permeability tight sandstone reservoir widespread in Su-lige and western Sichuan area,they have complicated pore structure,low permeability,low porosity and the reservoir heterogeneity is serious,geological structure is complex.Such natural gas reservoir productivity is low,before putting into production,workers used to add sandfracture in vertical wells.But such gas reservoir containing gas resources are rich,wide distribution area,in natural gas development plays a vital role,and from the current trend to this kind of reservoir development will still continue to strengthen.The horizontal well technology is currently tight sandstone gas reservoir development the common method,with the horizontal well drilling the well completion technology and various related tools,instruments more perfect of,its advantages will also reflect more obvious.Lead to low permeability sandstone gas reservoir development effect dense not ideal of an important reason is that the region's sand body distribution characteristics and failed to accurately predict to all kinds of sand body type not to carry on the summary,geological understanding not been guiding development work.Predecessors to such gas reservoir development of horizontal Wells of research method from the horizontal well development process basic adaptability,conventional gas reservoir engineering method to 3 d geological modeling and history after fitting prediction schemes.This paper is about the low permeability gas reservoirs consider dense complex geological structure,the characteristics of the first to the gas reservoir sand body structure of the anatomy and classification,then for horizontal well in different sand body in the types of development are discussed.Papers from the first area geological survey began,in the area of sand body exhibition cloth rule and reservoir heterogeneity.In previous to the region,sand body exhibition cloth over the foundation of the structure,and summarizes the property different and more typical of a few kinds of single sand body and buy sand body,such as migration of strong for home-based channel sand body type and join channel sand body,etc.Then the now oil field production in the more commonly used Joshi formula to the influence factors on the horizontal well productivity around the was discussed,and the main Influence factors to consider the:reservoir thickness,permeability,anisotropism,formation damage,the horizontal well long.The core part USES reservoir numerical simulation method,according to the front of the sums up the typical sand body structure,and the reservoir heterogeneity,discusses under various conditions of horizontal Wells development effect.For every model,are put forward the reasonable level long,reasonable output and optimization to horizontal section.In order to verify the reliability of the study,especially for the area set up a 3 d geological model,and then based on the production data of model modified and adjustment,based on the target of horizontal Wells of selected development,development effect and the comparison research before,have certain alignment and the effect is good.This paper the research content of closely for geology and engineering method,in all kinds of dense gas reservoir development technology of horizontal provide theoretical guidance and basis.