连续管密切割压裂工艺技术及其应用

Intensive cut coiled tubing fracturing technology and its application

摘要:

大庆外围致密油扶余和高台子储层，孔隙度低，渗透率<0.01 mD，基质物性差，常规完井后难以有效动用，必须进行体积压裂改造才能开发。以往该类储层采用“水平井（水平段1600 m）+桥塞”多簇体积压裂方式，针对性不强、施工时效低。针对以上储层特点以及开发过程中压裂工艺技术存在的问题，研究了以“缝控储量最大化”为目标、利用连续管携带底封工具，单簇单压、密切割连续管压裂工艺，增加有效储层改造体积（SRV），提高改造效果。该技术在173-86区块现场应用实践了4口井，工艺获得显著提升，Q196-P2 单井切割压裂完成118段，是目前国内单井切割段数之最，压后均套管自喷生产，改造效果明显。

Abstract:

The Fuyu and Gaotaizi tight oil reservoirs have the characteristic of low porosity with permeability less than 0.01mD， and poor reservoir property. As a result， conventional well completion cannot achieve the effective development， which can only be made possible by volume stimulation. In the past， this kind of reservoir was treated by SRV fracturing with the long horizontal section（1600m） plus the bridge plug， but it was not well targeted and the fracturing operation was inefficiency. In view of the properties of both reservoirs and the problems in fracturing technology， research was conducted on the new intensive cut coiled tubing fracturing technique with the maximization of the crack controlled reserve as the target and the coiled tube carrying the Y211 bottom hole assembly， and separate fracturing of each cluster. Application in four wells in Block 173-86 resulted in effective SRV， and improvement of the fracturing effect with significantly increased output. The well of Q196-P2 has been fractured up to 118 sections， setting a record in the cut section per single well in China. All the wells are producing by natural flows after fracturing measures， indicating obvious effect.