THN1凝析气藏开采效果评价及提液无效原因分析

塔里木盆地北部THN1凝析气藏边水较活跃,由于在气井开采中生产压差过大,导致边水突进加剧,边部气井相继迅速水淹停产,气井高含水与含水上升快已成为该气藏开发的主要问题。为此,从气藏地质特征、水侵方式、生产工作制度等方面入手,总结提出了一套开发管理措施:在边水气藏气井生产过程中遵循"少动、平稳、慢控"的原则,切忌猛开猛关和关井复压;在有水气藏开发过程中,加强产水动态监测,气井见水后要及早采取有效措施;提液开采不见效是多种因素导致的,应遵循相应的规则,不能急功近利;对较高部位的剩余气井,应及时调整工作制度,降低生产压差,或采取机械、化学方法堵水;对砂岩孔隙性边水凝析气藏,气井见水后不能靠少量井提掖排水。研究成果为该气藏后期开采或其他类似气藏的合理高效开发提供了技术支持。

Reservoir production evaluation and reason analysis of ineffective liquid extracting in the THN1 condensate gas reservoir, northern Tarim Basin

Edge water is active in the THN1 condensate gas reservoir in the northern Tarim Basin. During the gas well development, the dash of edge water is aggregated due to a big producing pressure drop, which results in water flooding and off production of the edge gas wells. High water content ratio and severe water incursion have become the primary problems in this gas reservoir development. In this paper, starting from the geologic features, water intrusion manners and the production working systems, a set of measures for the development and management are summarized and proposed. That is, during the production of gas wells in the gas reservoirs with edge water, the principle of “less mobility, more stability, and slow control” should be followed while sudden opening or rush shutting off of wells and pressure build up must be avoided. During the development of the gas reservoirs with water drive, the dynamic monitoring on the water producing should be intensified and effective measures should be taken as soon as the water breaks through. The inefficacy of liquid extracting results from numerous factors, which should be followed by the corresponding rules. For the gas wells at the high locations, production working systems should be adjusted in time by decreasing the producing pressure drop or chemical and mechanical water plugging. For the sand porous condensate gas reservoirs with edge water, when the water has broken through in the gas wells, liquid extracting should not be carried out by only several wells. These measures provide a technical support for the reasonable and highly efficient development of the water drive gas reservoirs.