摘要
松辽盆地南部深层致密气藏具有岩性多变、低孔、特低渗、埋藏深、杨氏模量高、压力高、温度高等特点,压裂改造加砂规模小、施工砂液比低且易发生早期脱砂现象。为此,研究了一种新的低伤害压裂技术,力求实现低伤害、深穿透、高导流的目标。其要点包括压前储层精细评价、耐高温耐剪切的低伤害压裂液体系、小粒径为主的高强度组合粒径支撑剂、压裂多级优化设计、螺旋式及段塞式加砂程序设计、新型压裂施工配套技术(如CO2增能助排、三变压裂液技术、多级高强度支撑剂段塞技术、前置阶段两次瞬时停泵压力测试、支撑剖面优化及控制、考虑应力敏感和循环应力载荷条件下的压后返排控制方法)等。经过两年来9井次的现场试验,成功率与有效率大幅提高,加砂规模及施工砂液比等也屡创历史新高,打开了松辽盆地南部深层致密气藏的勘探局面,为经济有效地开发该区块提供了重要的技术支撑。
Deep dense gas reservoirs in the southern Songliao Basin are characterized by complicated lithology,deep burial,extra low porosity and permeability,high Young's modules,high pressure and high temperatures and so on,so difficulties exist in hydraulic fracturing such as small sand adding volume,low proppant concentration,and early sand screen out with poor fracturing effect.Therefore,this paper introduced a new technology of low damage hydraulic fracturing,including reservoir evaluation before fracturing,heat/shear resistance and low damage fracturing fluid optimization,small size and high strength proppant combination,slug and spiral sand adding optimization,and new fracturing treatment allied techniques,such as CO2 energization and aid-flow back,multi level and high strength proppant slug,twice instant shut-in in pad and so on.The results from nine times field experiments within these two years show that the fracturing success ratio and stimulation effects are improved greatly,and the volume of sand adding and proppant concentration are also improved significantly.This research has offered robust tech-support to the economical and effective exploration and exploitation in the Songliao Basin.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2009年第12期50-52,共3页
Natural Gas Industry
基金
国家科技重大专项"大型油气田及煤层气开发"(编号:2008ZX05013)的部分研究内容
关键词
松辽盆地
深层
致密层
气藏
低伤害
深穿透
导流能力
压裂
Songliao Basin,deep burial,dense reservoir,low damage,deep penetrate,high fracture conductivity,hydraulic fracturing
