关键词: 辽河油田, 特低渗油藏, 强水敏, 分簇缝网压裂, 天然气驱, 重力辅助稳定驱, 开发方式

Abstract:

Shuang229-Wa111 blocks are typical blocks with abundant incremental proved OOIP. Due to the low quality of the oil, there are some problems encountered in new production wells such as low productivity and rapid production decline and it is difficult to realize rapid producing of reserves and large-scale oil production in this block. In accordance with the development principle of overall deployment and implementation in batches, optimal reservoirs are selected to establish a test area. Aiming at the characteristics of deep burial, poor physical properties and high dip angle of the reservoir, this paper uses the control variable method and grouping analogy method to study reservoir stimulation and energy supplement by combining indoor feasibility study with field practices. The results show that compared with the effects of nonfracturing, conventional fracturing, conventional stratified fracturing and hydraulic fracturing with large volume of fracturing fluid, the effect of clustering network fracturing is pretty good, and large displacement fracturing with low sand concentration in vertical wells can be used to further improve oil production at the initial production stage. Near miscible gravity drainage technology with gas injected into reservoir top can improve recovery factor by 6% comparing with waterflooding, which can be used as a most effective energy supplement way in the study area. Efficient development of low quality reserves in the area can be realized by applying clustering network fracturing to improve oil production at the initial production stage and by using gas-injection near-miscible gravity drainage to effectively control the production decline.

Key words: Liaohe oilfield, ultra-low permeability reservoir, strong water sensitivity, clustering network fracturing, natural gas drive, gravity drainage, development method