Abstract: Hydrofracturing technology is critical for effective development of low-permeability reservoirs. However, production wells after being hydrofractured may lead to inefficient hydrofracturing closure during the process of production, and stimulation results get more and more poor. To solve the problem, people carry out research on fracturing issues to change crack direction. This paper elaborates the technical principle of turnaround fracturing, sets up a mathematical model, and puts forward the principle of well selection for turnaround refracturing. Turnaround fracturing technology has been applied to 15 wells in Laojunmiao Oilfield and achieved better stimulation results. Turnaround fracturing is very significant to comprehensive management and increase of production in old oilfields.

Key words: Laojunmiao Oilfield, turnaround fracturing, well selection, fracture monitoring, field application

摘要： 水力压裂技术是有效开发低渗透油藏的主要技术措施,但经过水力压裂的采油井,在生产过程中由于种种原因可能导致水力裂缝闭合失效,增产效果越来越差。为此,人们研究了使裂缝转向的压裂问题。文章阐述了转向压裂的技术原理,建立了裂缝转向的数学模型,提出了裂缝转向重复压裂的选井选层原则。老君庙油田裂缝转向压裂矿场实施15口井,取得了较好的增产效果。裂缝转向压裂对于老油田综合治理、挖潜增产具有非常重要的意义。

关键词: 老君庙油田, 转向压裂, 井层优选, 裂缝监测, 矿场应用