摘要
目前,吉林油田CCUS已进入工业化推广应用阶段,部分井油压超过掺输压力,需介入控压措施,而准确预测井筒压力则是进行转喷预测和控压工艺设计的关键。CO_(2)驱高气液比油井井筒流动具有多组分、存在相变及流型转变等特征,导致现有压降模型不适用。为了进一步揭示CO_(2)驱油井井筒多相流动规律,准确预测井筒压降,开展了油气水三相井筒可视化流动模拟试验,明确了高气液比条件下,气体扰动对油水相间作用的影响规律;基于试验数据,通过因素分析,明确了表观气、液流速和含水率与持液率的变化关系,引入新的无因次数准数,拟合得到持液率计算新模型;综合考虑CO_(2)在原油和水中的溶解度,以及CO_(2)沿井筒流动的相态变化,建立了CO_(2)驱高气液比油井压降预测模型;现场实际测压数据验证表明:新模型最大误差为8.32%。与常用工程压降模型相比,新模型精度最高。该研究成果对保障CO_(2)驱高气液比油井的安全稳定生产具有重要的意义。
Currently CCUS in Jilin Oilfield has entered the stage of industrial promotion and application,and some wells have oil pressures that exceed the blending pressure,requiring intervention in pressure control measures.Accurate prediction of wellbore pressure is the key to conducting blowout prediction and pressure control process design.Compared with conventional wellbore pressure prediction for oil and gas wells,wellbore flow in CO_(2)-driven wells with a high gas-liquid ratio is characterized by multi-components,phase transitions,and flow pattern transitions,leading to the inapplicability of existing pressure drop models.In order to further reveal the multiphase flow law in the wellbore of CO_(2)drive oil wells and accurately predict wellbore pressure drop,a visualization simulation experiment of oil gas water three-phase wellbore flow was conducted to clarify the impact of gas disturbance on the interaction between oil and water phases under high gas-liquid ratio conditions.Based on experimental data and factor analysis,the relationship between apparent gas and liquid flow rates,water content,and liquid holdup was clarified.A new dimensionless number was introduced to fit a new model for calculating liquid holdup.Taking into account the solubility of CO_(2)in crude oil and water,as well as the phase change of CO_(2)flowing along the wellbore,a pressure drop prediction model for high gas-liquid ratio oil wells driven by CO_(2)was established.The field actual pressure measurement data verification shows that the maximum error of the new model is 8.32%.Compared with commonly used engineering pressure drop models,the new model has the highest accuracy.The research results have important significance for ensuring the safe and stable production of CO_(2)flooding oil wells with high gas-liquid ratio.
作者
周宇驰
潘若生
江劲宏
刘永辉
ZHOU Yuchi;PAN Ruosheng;JIANG Jinhong;LIU Yonghui(Research Institute of Oil and Gas Engineering,Jilin Oilfield,Songyuan 138000,China;School of Petroleum Engineering,Southwest Petroleum University,Chengdu 610500,China)
出处
《石油矿场机械》
CAS
2023年第6期9-16,共8页
Oil Field Equipment
基金
中国石油股份公司重大科技项目"CCUS注采工艺、产出气循环利用及高效防腐关键技术研究"(2021ZZ01-04)。
