天然气地球科学 ›› 2020, Vol. 31 ›› Issue (6): 865–876.doi: 10.11764/j.issn.1672-1926.2020.02.009

• 天然气开发 • 上一篇    下一篇

致密砂岩气藏井网加密与采收率评价

李奇1,2,3(),高树生3,4(),刘华勋3,4,叶礼友3,4,吴泓辉5,朱文卿3,4,张杰1,2,3,杨懿1,2,3,杨茂红6   

  1. 1.中国科学院大学,北京 100049
    2.中国科学院渗流流体力学研究所,河北 廊坊 065007
    3.中国石油勘探开发研究院渗流流体力学研究所,河北 廊坊 065007
    4.中国石油集团科学技术研究院有限公司,北京 100083
    5.中海油能源发展股份有限公司工程技术公司,天津 300459
    6.中国石油川庆钻探工程有限公司工程技术研究院,陕西 西安 710018
  • 收稿日期:2019-11-13 修回日期:2020-02-25 出版日期:2020-06-10 发布日期:2020-06-17
  • 通讯作者: 高树生 E-mail:liqi17@petrochina.com.cn;gaoshusheng69@petrochina.com.cn
  • 作者简介:李奇(1993-),女,黑龙江大庆人,博士研究生,主要从事致密砂岩气藏渗流规律与气藏工程研究.E?mail:liqi17@petrochina.com.cn.
  • 基金资助:
    国家自然科学基金项目“高温、高压、高应力下油气藏多尺度多场耦合非线性流动机理及表征研究之高温高压下储层多相流体流固耦合渗流规律研究”(SL31909);中国石油天然气股份有限公司科技项目“天然气藏开发关键技术”(2016B-15)

Well network densification and recovery evaluation of tight sandstone gas reservoirs

Qi LI1,2,3(),Shu-sheng GAO3,4(),Hua-xun LIU3,4,Li-you YE3,4,Hong-hui WU5,Wen-qing ZHU3,4,Jie ZHANG1,2,3,Yi YANG1,2,3,Mao-hong YANG6   

  1. 1.University of Chinese Academy of Sciences, Beijing 100049, China
    2.Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
    3.Department of Porous Flow and Fluid Mechanics, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China
    4.Research Institute of Petroleum Exploration and Development Company Limited, China National Petroleum Corporation, Beijing 100083, China
    5.CNOOC Energy?Development Drilling and Production Company, Tianjin 300459, China
    6.CNPC CCDC Drilling & Production Technology Research Institute, Xi’an 710018, China
  • Received:2019-11-13 Revised:2020-02-25 Online:2020-06-10 Published:2020-06-17
  • Contact: Shu-sheng GAO E-mail:liqi17@petrochina.com.cn;gaoshusheng69@petrochina.com.cn
  • Supported by:
    The China National Science and Technology Major Project(SL31909);The Major Science and Technology Projects of CNPC(2016B?15)

摘要:

致密砂岩气藏储层物性特征差异性较大,其不确定性严重制约气藏的稳产和高效开发。为有效开发致密砂岩气藏未动用储量,提高气田产量和采收率,对储层条件较为复杂的致密砂岩气藏进行井网密度优化是必要的。通过分析渗透率、孔隙度、有效厚度、含水饱和度、阈压梯度、产能系数和储容系数这7项储层物性参数对单井动态控制面积的影响,运用模糊数学方法,推理出井间无干扰时储层物性参数与单井动态控制面积的关系;并将计算所得的单井动态控制面积模糊预测值与地质井控面积对比,判断出不同储层物性条件下井网加密后井间是否会产生干扰,得到了随井网密度变化的干扰概率曲线,进而结合井间干扰概率构建了采收率评价模型,并在苏里格气田苏6区块开展应用。结果表明:使用新评价方法计算的致密砂岩气藏单井平均累计产气量及采收率,都与实际区块生产动态结果相一致,证明该方法是合理可靠的。采收率评价新方法为致密砂岩气藏井网优化提供了新思路。

关键词: 致密砂岩气藏, 井网密度优化, 物性参数, 单井动态控制面积, 干扰概率, 采收率评价模型

Abstract:

Tight sandstone gas reservoirs have large differences in physical properties and their uncertainty seriously restricts the stable production and efficient development of gas reservoirs. In order to effectively develop the unutilized reserves of tight sandstone gas reservoirs and improve gas production and recovery, it is necessary to optimize well pattern density of tight sandstone gas reservoirs with complex reservoir conditions. By analyzing the effects of seven reservoir physical parameters on single well dynamic control area, including permeability, porosity, effective thickness, water saturation, threshold pressure gradient, productivity coefficient and storage capacity coefficient, the relationship between reservoir physical parameters and single well dynamic control area without interference between wells is inferred by using fuzzy mathematics method. The calculated fuzzy prediction value of the single well dynamic control area is compared with the geological well control area to determine whether there will be interference between wells after the well pattern is encrypted under different reservoir physical conditions, and the interference probability curve that changes with the well pattern density is obtained. Furthermore, a recovery evaluation model is constructed based on the inter-well interference probability, which is applied in Su 6 well area. The results show that using the new evaluation method for tight sandstone gas reservoirs, the average cumulative gas production per well and recovery evaluated through the physical properties of the reservoir are consistent with the actual production dynamics results. Under certain conditions, this method is reasonable and reliable. The new method of recovery evaluation provides new ideas for well pattern optimization of tight sandstone gas reservoirs.

Key words: Tight sandstone gas reservoirs, Well network density optimization, Physical parameters, Single well dynamic control area, Interference probability, Recovery evaluation model

中图分类号: 

  • TE357

图1

全国低渗致密砂岩气藏等效单井动态控制面积统计"

表1

全国致密砂岩气藏典型井7项参数数据"

渗透率/(10-3 μm2孔隙度/%有效厚度/m含水饱和度/%阈压梯度/(MPa/m)产能系数/(10-3 μm2·m)储容系数/(m·%)
均值0.205 87.9534.8035.480.267 014.300 6301.112
中值0.112 17.6015.6033.800.036 02.368 6116.428
P50.012 34.605.0016.600.003 00.128 235.800
P100.019 75.566.4022.570.005 30.182 650.000
P500.112 17.6015.5033.780.035 82.279 8116.354
P900.565 510.6798.7549.900.304 844.184 4786.240

图2

单井动态控制面积与渗透率关系"

图3

单井动态控制面积与孔隙度的关系"

图4

单井动态控制面积与有效厚度的关系"

图5

单井动态控制面积与含水饱和度的关系"

图6

单井动态控制面积与阈压梯度关系"

图7

单井动态控制面积与产能系数关系"

图8

单井动态控制面积与储容系数关系"

图9

苏里格气田苏6区块和子洲气田的单井动态控制面积(a) 对比3个井区模糊预测值与等效动态值; (b) 模糊预测值Am与等效动态值As相关性"

图10

苏6区块井间干扰概率预测值与实际生产值对比"

图11

苏6区块单井平均累计产量与采收率优化曲线"

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