
第38参第4期 2016年7月
石油钻采工艺
OIL DRILLING & PRODUCTION TECHNOLOGY
文章编号:1000-7393(2016)04-0479-04
DOI: 10.13639/j.odpt.2016.04.014
Vol. 38 No. 4 July2016
J55、N80油管在CO,干法压裂环境中的适应性
余曦
中联煤层气有限责任公司研究中心
引用格式:余曦.J55、N80油管在CO,千法压裂环境中的适应性[J]石油钻采工艺,2016,38(4):479-482
摘要:CO,干法压裂施工过程中,CO,处于越临界低温状态,对压裂管程冷却效应明显,因此对压裂管柱的性能要求更高。结合CO,干法压裂的技术原理和特点,借签ASTM标准开展了2种不同钢级的油管试样的冷处理力学性能的试验分析。结果表明,在-60%拉伸试验中2种钢级管材试样均未达到晚初转变的临界点;在-60~-20℃冲击试验中,J55油管试样有明显变
进行。
关键词:CO,干法压裂;低温;N80油管;J55油管;力学性能;冷处理试验
中图分类号:TE931.2
文献标识码:A
Adaptability of J55andN80 tubings to CO,dry fracturing
YUXi
Research Cenfer of China United Coalbed Merthane Co. Lrd., Beijing 100016, Chind
Citation: YU Xi. Adaptability of J55 and N80 tubings to CO, dry fracturing [J] . Oil Drilling & Production Technology, 2016, 38(4): 479-482.
Abstract: In the process of CO, dry fracturing, CO, is at the state of supercritical low temperature, having apparent cooling effect on fracturing strings. In this circumstance, the higher property of fracturing string shall be essential. In reference to ASTM standard, the tubing samples of two different steel grades (J55 and N80) were tested in terms of their mechanical properties after cold treatment ac-cording to the technical principles and characteristics of CO, dry fracturing. It is shown that the samples of both steel grades don't reach the critical point of brittle-ductile transition in the extension test at 60°C. In the impact test at the temperature from 60°C to 20°C, brttleness trend is apparent in the sample of J55 tubing, but never occurs in the sample ofN80 tubing. It is concluded that the N80 tubing can satisfy the safety requirements for low-temperature CO, dry fracturing, thereby ensuring the safe operation.
Key words: CO, dry fracturing; low temperature; N80 tubing; J55 tubing; mechanical property; cold treatment test
随若常规油气勘探开发程度不断提高,非常规资源勘探开发逐渐成为国内外各大油气田工作的重点。CO,干法压裂技术正是针对非常规资源开发而兴起的一种新型压裂技术11-2],其技术核心是CO,相态变化,而影响相态变化的关键是压力和温度。该项技术的低温特性最为显著,由于施工过程中注入液态CO,对压裂管柱冷却效应明显,管柱随环境温度的降低,材料力学性能大幅度下降,甚至有可能低于材料的许用性能极限,这也是在低温环境下导致
压裂管柱脆化、断裂的主要原因。因此,评价管材在低温环境下的安全性能至关重要。笔者通过对N80 和J55油管的低温力学性能分析研究,评价优选适合CO,干法压裂技术的管材类型,以消除施工安全隐。
CO,干法压裂
Codryfracturing
CO2千法压裂使用-40~-20℃(压力1.8~2.2
第一作者:余曦(1989-),2014年毕业于中国石沟大学(北京)石油工程专业,现主要队事媒层气、致密气藏究井及压裂技术研究工作,助
理工程师。通讯地址:(100016))北京市朝阳区酒仙棒路乙21号国宾大厦。电话:010-84527681。E-mail;yuxi6@cno0c.com.cn