考虑高速非达西流的优势通道定量描述方法
A method for quantitative description of the dominant channel with high speed Non-Darcy flow
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- 引用格式:
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陈存良,王雨,岳宝林,杨明,马栋.考虑高速非达西流的优势通道定量描述方法[J].天然气与石油,2021,39(4):53-58.doi:10.3969/j.issn.1006-5539.2021.04.010
CHEN Cunliang, WANG Yu, YUE Baolin, YANG Ming, MA Dong.A method for quantitative description of the dominant channel with high speed Non-Darcy flow[J].Natural Gas and Oil,2021,39(4):53-58.doi:10.3969/j.issn.1006-5539.2021.04.010
- DOI:
- 10.3969/j.issn.1006-5539.2021.04.010
- 作者:
- 陈存良 王雨 岳宝林 杨明 马栋
CHEN Cunliang, WANG Yu, YUE Baolin, YANG Ming, MA Dong
- 作者单位:
- 中海石油(中国)有限公司天津分公司, 天津 300459
CNOOC (China) Tianjin Branch, Tianjin, 300459, China
- 关键词:
- 非达西流;高含水;优势通道;定量;井间连通性
Non-Darcy flow; High water-cut; Dominant channel; Quantitative; Interwell connectivity
- 摘要:
- 优势通道的发育导致大量注入水低效甚至无效循环,油田水驱开发效果变差,做好优势通道的定量描述是高含水期油田进一步提高水驱采收率的关键。为此,基于油田开发资料运用渗流理论建立了优势通道的定量描述方法。在正常储层与优势通道并联模型的基础上,根据注水井无效循环水模型、等价原则和体积类比公式得到优势通道的体积,并计算优势通道内流体的渗流速度,进而考虑高速非达西流现象,推导建立了一注一采模式下优势通道渗透率的计算模型。基于此,利用油藏井间动态连通性模型实现井组内注采方向的数据劈分,实现各方向优势通道的定量描述。将新计算方法应用于海上X油田,描述结果与动态分析情况非常吻合,验证了方法的可靠性,并据此选用粒径较大的试剂开展调驱试验,调驱后区块日增油近60 m3,含水率下降10%,起到了较好的增油降水效果。研究成果为高含水期油田优势通道的识别与治理提供了技术借鉴。
The development of the dominant channel seriously affects the water-flooding effect of the oil field, and leads to the deterioration of recovery rate. How to effectively describe the dominant channel is an urgent issue to further improve the recovery rate of water-flooding in high water cut oil field. Therefore, the quantitative calculation of the dominant channel’s parameters is carried out using the seepage theory and the mathematical means. The reservoir that develops the dominant channel is regarded as the parallel of the normal reservoir and the dominant channel. The ineffective water injection is calculated from the ineffective circulating water model. According to the principle of equivalence, the ineffective water production of the oil well and the water production of the normal reservoir are calculated. Then the dominant channel volume and the seepage velocity of the fluid in the channel are quantitatively described by the volume analogy formula and non-Darcy flow. The interwell connectivity model is used to calculate the parameters of the dominant channel in the well group and is applied to an offshore oil field X. The results are in good agreement with the dynamic analysis, which verifies the reliability of the method. It is suggested that the reagents with larger particle size should be selected to carry out the profile control, after which the daily oil increase in the block is nearly 60 m3 /d, and the water content rate is reduced by 10%. The results of the study provide a technical reference for the identification and management of dominant channels in oil fields at high water-cut period.
