川西积液水平井井筒压力及液位预测

Borehole pressure and liquid level prediction of liquid-loading horizontal wells in West Sichuan LIU Tong1,2, GUO Xinjiang2, WANG Yusheng3, CHEN Hailong2, LU Guangliang3, TANG Yong3
段塞流中气相漂移速度遵循bendiksen1984年静液中泰勒气泡上升速度关系式18v14泡状流向段塞流的过渡发生在含气率025持100石油钻采工艺2017年1月第39卷第1期液率075时联立式12式13并将持液率075代入得到泡状流向段塞流过渡的界限方程为1523油套环空液位以上气柱压力梯度gascolumnpressuregradientabovetheliquidleveloftubingcasingannulus油套环空液位以上的气体处于静止状态因此其压力梯度仅受气相重力影响gdsindpgl1624油套环空液位以下液柱压力梯度liquidcolumnpressuregradientbelowtheliquidleveloftubingcasingannulus油套环空液位以下液体为静止液柱其压力梯度仅与液相重力有关ldsindpgl173井筒压力及液位计算方法calculationmethodforboreholepressureandliquidlevel压力平衡模型仅包含一个平衡方程式2但要同时求解油管液位l1与油套环空液位l2两个参数会造成模型不封闭无法求解因此需要事先给定其中一个液位参数
川西积液水平井2 鲁光亮 3 唐勇 3
1. 中国石化西南油气分公司博士后工作站；2. 中国石化西南油气分公司石油工程技术研究院；3. 中国石化西南油气分公司川西采气厂
引用格式：刘通， 郭新江， 王雨生， 陈海龙， 鲁光亮， 唐勇 . 川西积液水平井井筒压力及液位预测［J］. 石油钻采工艺， 2017， 39 （1） ：97-102. 摘要：正确预测积液水平井井筒压力与液位是优选排液工艺、 制定排液参数的技术关键。基于 U 型管原理， 结合流体静力 学与动力学方程， 建立了积液水平井油管与油套环空压力平衡模型。模型中油管压降来源于液位以上流动气体与液位以下的 两相流动， 其两相流持液率基于漂移模型得到；油套环空压降则来源于液位以上的静气柱压力和液位以下的静液柱压力；油 管与油套环空压力在井下连通点处相等；模型计算采用了先借助地面回声仪获得油套环空中的液位， 再利用模型求解油管液 位及压力的方法。川西气田什邡 6-1HF 水平井的模型预测压力与实际测压数据的误差为 3.75%， 表明该方法能够正确预测川 西气田积液水平井的井筒压力与积液液位， 且预测时效优于传统的测压方法。 影响因素分析表明， 油管液位通常高于环空液位， 油套压差的减少能够间接反映油管积液量的减少， 为类似油田的开发提供技术指导。 关键词：川西气田；水平井；积液；井筒压力；液位；漂移模型；回声仪 中图分类号：TE37 文献标识码：A
1. Postdoctoral Workstation, SINOPEC Southwest Oil & Gas Company, Chengdu 610041, Sichuan, China; 2. Petroleum Engineering Technology Institute, SINOPEC Southwest Oil & Gas Company, Deyang 618000, Sichuan, China; 3. West Sichuan Gas Production Plant, SINOPEC Southwest Oil & Gas Company, Deyang 618000, Sichuan, China
Citation: LIU Tong, GUO Xinjiang, WANG Yusheng, CHEN Hailong, LU Guangliang, TANG Yong. Borehole pressure and liquid level prediction of liquid-loading horizontal wells in West Sichuan［J］. Oil Drilling & Production Technology, 2017, 39(1): 97-102. Abstract: The technical key to drainage technology optimization and drainage parameter determination is to predict accurately the borehole pressure and liquid level of liquid-loading horizontal wells. The pressure balance model of tubing and tubing-casing annulus in liquid-loading horizontal well was developed based on the U-shape pipe principle by using fluid statics and dynamics equations. In this model, the tubing pressure drop is derived from the flowing gas above the liquid level and the two-phase flowing below the liquid level, and the two-phase liquid holdup is basically obtained from the drift model. The tubing-casing annulus pressure drop is derived from the static gas column pressure above the liquid level and the static liquid column pressure below the liquid level. The tubing pressure and the tubing-casing annulus pressure are equal at downhole connecting points. However, two liquid level parameters cannot be solved only by using one balance equation. To deal with this problem, the liquid level in tubing-casing annulus was measured by virtue of ground echometer, and then the liquid level and pressure in tubing were solved by means of the model. Case study indicates that by virtue of this method, the borehole pressure and liquid loading level in liquid-loading horizontal wells in West Sichuan Gasfield can be predicted accurately, and its prediction time efficiency is superior to that of traditional manometry. The influential factors were also analyzed. And it is indicated that the liquid level in tubing is generally higher than that in annulus, and the decrease of tubing-casing pressure difference can reflect indirectly the reduction of liquid loading volume in tubing. Key words: West Sichuan Gasfield; horizontal well; liquid loading; borehole pressure; liquid level; drift model; echometer
第 39 卷 第 1 期 2017 年 1 月
石 油 钻 采 工 艺 OIL DRILLING & PRODUCTION TECHNOLOGY
Vol. 39 No. 1 Jan. 2017
文章编号：1000 – 7393 （ 2017 ）01 – 0097 – 06 DOI:10.13639/j.odpt.2017.01.019