套管居中度计算模型改进
Improvement of casing centering calculation model
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- 引用格式:
-
俞豪,吴朗,冀梦佳.套管居中度计算模型改进[J].天然气与石油,2022,40(5):96-100.doi:10.3969/j.issn.1006-5539.2022.05.014
YU Hao, WU Lang, JI Mengjia.Improvement of casing centering calculation model[J].Natural Gas and Oil,2022,40(5):96-100.doi:10.3969/j.issn.1006-5539.2022.05.014
- DOI:
- 10.3969/j.issn.1006-5539.2022.05.014
- 作者:
- 俞豪1 吴朗2 冀梦佳1
YU Hao1, WU Lang2, JI Mengjia1
- 作者单位:
- 1. 长江大学(武汉)石油工程学院, 湖北 武汉 430100; 2. 中国石油集团川庆钻探工程有限公司井下作业公司, 四川 成都 610500
1. School of Petroleum Engineering, Yangtze University, Wuhan, Hubei, 430100, China; 2. Downhole Company, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, Sichuan, 610500, China
- 关键词:
- 套管居中度;套管浮重;套管挠度;套管偏心距
Casing centering degree; Casing floating weight; Casing deflection; Casing eccentricity
- 摘要:
固井质量是影响油气井完整性的重要因素,套管居中度与固井质量密切相关。目前套管居中度计算模型未考虑套管内外液体密度差的影响,不符合现场实际，计算套管受力变形公式不够准确,影响居中度计算精度。针对上述问题,在SY/T 5334—1996《套管扶正器安装间距计算方法》(以下简称SY/T 5334—1996)模型基础上,修正了套管浮重公式、套管挠度公式及套管偏心距的计算方法,形成了套管居中度计算改进模型。将改进模型和原模型计算结果分别与相储3井套管居中度成像测井数据比较表明:改进模型计算结果较原模型准确度提高3.214%,平均误差为11.094%，符合工程需要,所以改进模型较原模型计算结果更为准确，对套管居中度计算具有指导意义。
Cementing quality is an important factor affecting the integrity of oil and gas wells and casing centering degree is closely related to cementing quality. At present, the calculation model of casing centering degree does not consider the influence of liquid density difference inside and outside the casing, which is inconsistent with the field conditions, and the formula for calculating casing stress and deformation is not accurate enough, which affects the calculation accuracy of casing centering degree. Based on SY/T 5334—1996 model, the casing floating weight formula, casing deflection formula and casing eccentricity calculation method are modified, and an improved casing centering calculation model is formed. The comparison of improved model calculation resalts with the centering degree imaging logging data of Well Xiangchu 3 shows that the accuracy of the improved model is 3.214%higher than the original one, with the average error of 11.094%, which meets engineering requirements. So, the improved model is more accurate than the original one, and is of guiding significance for casing centering calculation.
