高温高产井井口抬升及下沉风险分析研究  

Risk Analysis of Wellhead Uplift and Subsidence in High Temperature and High Yield Wells

作　　者：王雪刚 魏瑞华 张浩 于浩[3] 赵朝阳 WANG Xuegang;WEI Ruihua;ZHANG Hao;YU Hao;ZHAO Zhaoyang(Engineering Technology Research Institute,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China;Exploration Utility Department,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China;National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000 [2]中国石油新疆油田分公司勘探事业部,新疆克拉玛依834000 [3]油气藏地质及开发工程全国重点实验室·西南石油大学,四川成都610500

出　　处：《西南石油大学学报（自然科学版）》2023年第6期135-146,共12页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家自然科学基金(51974271,52104008)。

摘　　要：由高温热膨胀效应引发的井口抬升现象在各大油田普遍存在,严重威胁生产作业安全。基于多级传热理论,通过有限元方法模拟多级套管水泥环地层非线性传热过程及热膨胀现象,提出了一种新的井口抬升计算方法。以新疆油田某区块X1井为例,开展了不同工况下各级管柱井口风险评价分析。研究发现,在极限生产工况下,由于表层套管环空水泥环产生的封固作用,使得各级套管在井口位置处虽产生较大上顶力,但并不会发生井口抬升现象;而当表层套管水泥环存在一定程度缺失后,井口出现整体抬升现象,且在井口装置压重作用下,井口整体抬升量从0.03 m缩减至0.02 m。结果表明,该方法可以定量评价实际生产过程中井口安全性,对实际现场井口抬升计算及风险评价具有一定指导意义。The phenomenon of wellhead growth caused by high temperature thermal expansion is widespread in major oil fields,which seriously threatens production safety.Based on the multistage heat transfer theory,the nonlinear heat transfer process and thermal expansion phenomenon of multistage casing-cement sheath-formation are simulated by finite element method,and a new wellhead lift calculation method is proposed.Taking Well X1 of a block in Xinjiang Oilfield as an example,the risk assessment and analysis of various string wellhead under different working conditions are carried out.It is found that under the limit production conditions,although the casing at all levels has a large lifting force at the wellhead due to the cementing effect of the casing annulus,the wellhead uplift phenomenon does not occur.However,when the casing cement sheath is damaged to a certain extent,the overall wellhead lift occurs,and the overall wellhead lift decreases from 3 cm to 2 cm under the action of the pressure and weight of the wellhead device.The results show that this method can quantitatively evaluate the wellhead safety in the actual production process,and has certain guiding significance for the actual field wellhead lifting calculation and risk evaluation.

关 键 词：有限元法 多级传热 井口抬升量 水泥环封固作用 井口安全 

分 类 号：TE357[石油与天然气工程—油气田开发工程]