西南石油大学学报(自然科学版) ›› 2020, Vol. 42 ›› Issue (6): 42-48.DOI: 10.11885/j.issn.1674-5086.2020.06.24.01

• 油气田人工智能技术与应用专刊 • 上一篇    下一篇

互相关函数法在定位射孔深度上的应用

李缙1, 刘玉海2, 张剑1, 王江2, 张翼凌1   

  1. 1. 西南石油大学计算机科学学院, 四川 成都 610500;
    2. 中国石油渤海钻探工程有限公司, 天津 滨海新区 300457
  • 收稿日期:2020-06-24 发布日期:2020-12-21
  • 通讯作者: 李缙,E-mail:297130224@qq.com
  • 作者简介:李缙,1980年生,女,汉族,河北献县人,讲师,硕士,主要从事数据挖掘、软件工程与教学方面的工作。E-mail:297130224@qq.com;刘玉海,1977年生,男,汉族,山东寿光人,高级工程师,博士,主要从事油气藏监测技术研发方面的工作。E-mail:lyhliu@cnpc.com.cn;张剑,1978年生,男,汉族,四川自贡人,讲师,硕士,主要从事石油大数据、人工智能及信息化方面的科研与教学工作。E-mail:27444067@qq.com;王江,1978年生,男,汉族,陕西西安人,高级工程师,主要从事油气藏射孔仪器研发和应用等方面的研究工作。E-mail:wangjiang@cnpc.com.cn;张翼凌,1983年生,女,汉族,四川南充人,讲师,硕士,主要从事计算机软件与理论、数据库技术与应用研究。E-mail:40303032@qq.com

Application of Cross Correlation Function Method in Locating Perforation Depth

LI Jin1, LIU Yuhai2, ZHANG Jian1, WANG Jiang2, ZHANG Yiling1   

  1. 1. School of Computer Science, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. CNPC Bohai Drilling Engineering Co. Ltd., Binhai New Area, Tianjin 300457, China
  • Received:2020-06-24 Published:2020-12-21

摘要: 油气井射孔深度校深技术是保证油气井完井精确射孔作业的前提。射孔作业利用油气井储层的自然放射性伽马校深和油套管接箍传统校深方法,随着油气开采时间延长,井下伽马放射性的减弱和油套管接箍的破损,射孔校深测量的这两路信号往往被井下噪声煙没,有效信号特征不明显,直接依靠传统的幅度识别法,会带来较大的射孔精度误差,甚至造成误射孔事故的发生,已无法满足薄储层精确深度射孔的需求。基于信号互相关函数法计算原理,将标准的接箍信号和伽马信号与射孔校深采集的对应信号进行互相关运算,压制背景噪声,突出有效信号,实现射孔精确校深的目的。现场应用表明,该方法校深技术简单,能够满足现场一次作业实现实时校深和射孔完井的目的,具有一定的实际应用价值。

关键词: 互相关运算, 射孔校深, 射孔作业, 油气井完井, 油气藏开发

Abstract: Perforation depth correction technology for oil and gas wells is a prerequisite to ensure accurate perforation operations for oil and gas well completion. Perforating operations use the natural radioactive gamma correction method of oil and gas well reservoirs and the traditional depth correction method of tubing and casing joints. With the prolonged oil and gas production time, the downhole gamma radioactivity is weakened and the tubing and casing joints are damaged. The two signals of the depth calibration measurement are often obscured by downhole noise, and the effective signal characteristics are not obvious. Directly relying on the traditional amplitude identification method will bring about large perforation accuracy errors and even cause accidental perforation. It cannot meet the demand for precise deep perforation of thin reservoirs. Based on the calculation principle of the signal cross-correlation function method, the standard hoop signal and gamma signal are cross-correlated with the corresponding signals collected by the perforation depth calibration to suppress background noise, highlight the effective signal, and achieve the purpose of accurate perforation depth calibration. Field application shows that the method is simple in depth calibration technology, can meet the purpose of real-time calibration and perforation completion in one field operation, and has certain practical application value.

Key words: cross-correlation calculation, perforation calibration, perforation operation, oil and gas well completion, oil and gas reservoir development

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