DQL-T碳同位素随钻录井仪的研制与应用  

Development and application of DQL⁃T carbon isotope logging while drilling apparatus

作　　者：胡宗敏 赵民 苑晨 张祥国 耿长喜 李庆刚 HU Zongmin;ZHAO Min;YUAN Chen;ZHANG Xiangguo;GENG Changxi;LI Qinggang(CNPC Daqing Oilfield Production Technology Institute,Daqing,Heilongjiang 163411,China;CNPC Daqing Drilling&Exploration Engineering Corporation Geological Logging Company(Geological Research Institute),Daqing,Heilongjiang 163411,China;Daqing Branch,China Petroelum Finance Co.,Ltd.,Daqing,Heilongjiang 163458,China;Exploration Division(Geophysical Department)of CNPC Daqing Oilfield,Daqing,Heilongjiang 163453,China;EISC Center,CNPC Daqing Drilling Engineering Company Limited,Daqing,Heilongjiang 163114,China;Engineering Technology Department of CNPC Daqing Oilfield,Daqing,Heilongjiang 163711,China)

机构地区：[1]中国石油大庆油田采油工艺研究院 [2]中国石油大庆钻探地质录井公司(地质研究院) [3]中油财务公司大庆分公司 [4]中国石油大庆油田勘探事业部(地球物理部) [5]中国石油大庆钻探工程有限公司EISC中心 [6]中国石油大庆油田工程技术部

出　　处：《录井工程》2025年第1期16-21,共6页Mud Logging Engineering

摘　　要：碳同位素录井技术在石油勘探领域尤其是非常规油气勘探中应用广泛,为满足页岩油气大规模勘探开发需求,研制了DQL⁃T碳同位素随钻录井仪。其基于色谱-中红外量子级联激光联用,采用的激光吸收光谱技术是一种检测性能高、抗干扰能力强、使用成本低的气体检测技术。通过12C-O/13C-O分子键对激光光谱的吸收特征峰,能快速检测碳化合物的同位素值,将钻井液气或岩屑罐顶气进行C_(1)-C_(3)组分分离后输入氧化池,氧化生成的CO_(2)输入中红外激光光谱测量模块,即可实现碳同位素的测量。通过研究“紧凑-直线”型激光测量模块和超小体积气体吸收腔等技术达到整体设备小型化目的,采用多级控温技术使钻探环境下光谱核心温度波动小于0.02℃,从而可在井场实时测量钻井液气以及岩屑罐顶气碳同位素的变化特征。对某油田X井进行的碳同位素录井分析表明,DQL⁃T碳同位素随钻录井仪能够快速进行碳同位素测量,适用于野外严苛环境;分析认为罐顶气δ^(13)C_(1-7)分馏较大、放气量中等的储层,油气富集程度高、赋存压力较大、储层物性相对较好,可作为重点改造层段。Carbon isotope logging technology is widely used in oil exploration realm,especially in unconventional oil and gas exploration.To meet the largescale exploration and development needs of shale oil and gas,DQLT carbon isotope logging while drilling apparatus has been developed.It is based on chromatography coupled with midinfrared quantum cascade laser and uses laser absorption spectrum technology,which is a gas detection technology with high detection performance,strong antijamming ability,and low usage cost.The isotopic values of carbon compounds can be detected quickly by the absorption characteristic peaks of the molecular bond of 12C-O or 13C-O on laser spectrum.The C_(1)-C_(3)components of drilling fluid gas or cuttings headspace gas are separated and enter the oxidation pond,and the CO_(2)generated by oxidation enters the midinfrared laser spectrum measurement module for carbon isotope measurement.Through the research of"compactlinear"laser measurement module,superminiature volume gas absorption cavity and other techniques,the purpose of overall equipment miniaturization is achieved.The multistage temperature control technique is used to make the spectral core temperature fluctuation in the drilling environment less than 0.02℃,and the change characteristics of carbon isotope of drilling fluid gas and cuttings headspace gas can be measured in real time at the well site.The carbon isotope logging analysis of well X in an oil field shows that DQLT carbon isotope logging while drilling apparatus can quickly measure carbon isotope and is suitable for the harsh environment in the field.Analysis suggests that the reservoirs with highδ^(13)C_(1-7)fractionation and moderate outgassing amount of the headspace gas have the high enrichment degree of the hydrocarbon accumulation,large occurrence pressure and relatively good physical properties,which can be used as the key reconstruction intervals.

关 键 词：碳同位素 随钻录井仪 中红外激光光谱 量子级联激光器 页岩气 

分 类 号：TE132.1[石油与天然气工程—油气勘探]