威远页岩气井EUR测算流程及方法研究
中国石油长城钻探工程有限公司, 地质研究院, 辽宁盘锦 124010
| 摘 要： | 由于页岩气井独特的纳米孔隙、纳达西渗透率，长段多簇的高强度大排量缝网压裂，频繁的压窜干扰、变压变产生产模式等因素，导致准确预测其单井EUR存在较大难度。鉴于此，本文针对页岩气井压后、测试、递减三个不同时期，通过构建估算模型和优选预测方法，建立了单井EUR三级测算流程。压后阶段利用多元回归关系式初步估算（平均计算误差为5.5%），测试阶段采用测试产量线性关系式进行预测（相关系数为0.88），递减阶段主要通过解析模拟法不断提高计算精度。基于威远区块的动静态资料，开展了140口页岩气井的EUR预测，结果显示平均单井EUR为0.81亿方，Ⅰ类井1.22亿方，Ⅱ类井0.78亿方，Ⅲ类井0.46亿方。此流程及方法对其他页岩气或非常规气的单井EUR测算，具有一定的指导和借鉴意义。 |
| 关 键 词： | 页岩气; EUR; 操作流程; 优选; 解析法 |
| DOI： | 10.57237/j.jest.2023.03.001 |
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收稿日期: 2023-04-17
接受日期: 2023-05-16
在线出版日期: 2023-05-25
Study on EUR Calculation Workflow and Method for Shale Gas Well in Weiyuan Block
Geology Research Institute of Great Wall Drilling Company, PetroChina, Panjin 124010, China
| Abstract: | Due to the unique nano pores and Nadasi permeability of shale gas wells, high strength and large displacement fracture matrix fracturing with long sections and clusters, frequent pressure channeling interference, variable pressure and production mode and other factors, it is difficult to accurately predict its single well EUR. According to the three different periods of post fracturing, testing and decline of shale gas wells, the three-level calculation workflow of single well EUR is established by constructing estimation model and optimizing prediction method. In the post fracturing stage, the multiple regression relationship is used for preliminary estimation (The average calculation error is 5.5%), in the test stage, the linear relationship of test production is used for prediction (The correlation coefficient is 0.88), and in the decline stage, the calculation accuracy is mainly improved by analytical simulation method. Based on the dynamic and static data of Weiyuan block, EUR prediction is made for 140 shale gas wells. The results show that the average EUR of single well is 81 million cubic meter, 122 million cubic meter for class I well, 78 million cubic meter for class II well and 46 million cubic meter for class III well. This workflow and method can be used as a guide and reference for single well EUR calculation of other shale gas or unconventional gas. |
| Keywords: | Shale Gas; EUR; Operation Workflow; Optimization; Analytic Method |
基金
| 1. | 国家科技重大专项“页岩气气藏工程及采气工艺技术” (2017ZX05037-001) |
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