氮气在乐安稠油油田开采中的应用

NITROGEN APPLICATION IN LE’AN HEAVY OILFIELD DEVELOPMENT

刘艳波 刘东亮

Liu Yanbo Liu Dongliang

胜利油田有限公司现河采油厂, 山东东营 257068

Xianhe Production Plant, Shengli Oilfield Company

针对乐安稠油油田注蒸汽吞吐末期蒸汽超覆及汽窜严重的状况,利用氮气能够稀释降黏、增加弹性气驱能量等特性,进行了氮气以及氮气+泡沫剂的室内研究与评价,筛选出适合本油田开发的高温泡沫剂,在设计合理注气参数的前提下,开展了单纯注氮以及氮气泡沫调剖工艺措施的现场应用试验,相应解决了蒸汽与地下原油密度差引起的蒸汽超覆和汽窜现象以及潜山油藏底水锥进问题,有效缓解了油层平面及纵向上动用不均衡的开采矛盾,为同类型油藏的后期开发提供了依据。

Facing the realities of stream severe overlapping and channeling in late cyclic steam injection production in Le’an heavy oilfield, by the nitrogen characters of diluting and decreasing viscosity and increasing flexible steam flooding energy, the study researches and evaluates nitrogen gas and nitrogen with former in lab, selects the suitable high temperature former. Based on the reasonable steam injection parameters, the restudy works on the tests between nitrogen gas injection and nitrogen former injection on site. This deals with the problems of stream overlapping and channeling caused by different densities between steam and oil. Also it deals with the problem of bottom water coning in burial hill reservoirs, and effectively reduces the non-equivalent producing conflicts between formation level and vertical. It offers the good experience and evidence to the following late reservoir development.

10.3969/j.issn.1000-7393.2004.03.021