海相砂岩水驱气藏井筒排液技术研究——以南海东部PY气田为例  

Research on Wellbore Drainage Technology in Marine Sandstone Gas Reservoir Developed by Water Drive——A Case Study of PY Gas Field in Eastern South China Sea

作　　者：杨鹏 羊新州 洪舒娜 白美丽 潘雪徵 Yang Peng;Yang Xinzhou;Hong Shuna;Bai Meili;Pan Xuezheng(Shenzhen Branch of CNOOC China Limited,Shenzhen Guangdong 518064)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518064

出　　处：《中外能源》2021年第9期52-58,共7页Sino-Global Energy

基　　金：中国海洋石油集团有限公司重大科技专项“南海东部油田上产2000万吨关键技术研究(编号:CNOOC-KJ135 ZDXM37 SZ)”部分研究成果。

摘　　要：见水气井井筒排液技术研究较多,但大多针对陆地气井以及裂缝性或低渗气藏,海上气井排液技术因见水规律与平台空间限制等原因,与陆地气田相比有较大不同。本文以南海东部海上PY气田为例对海相砂岩水驱气藏井筒排液技术开展研究。通过调研主要的井筒排液工艺,结合海上气井的实际应用情况,针对PY气田气井特征进行适应性分析,筛选出优选管柱、电泵排液、液体泡排、连续气举四个工艺方向,并对其中最适用的两项——电泵排液与优选管柱进行了配套技术研究。气井电泵排液需经过工艺管柱改造,搭配井下气液分离器、特殊Y接头、特殊井口等配套井下工具,从而实现气液高效分离,应用于高产液气井。针对优选管柱,利用PIPSIM软件与KH波动理论携液计算方法,从摩阻、冲蚀、携液三因素分析,得到不同尺寸油管的推荐产气量,当气井低于目前管柱最低携液气量时,筛选出73.025mm油管为最优接替管柱,适用于低产液气井。该项气井排液配套工艺技术可以解决此类海相砂岩水驱气藏不同类型气井在不同生产阶段的井筒排液问题,在延长气井生产期、提高天然气产量方面具有实际意义。There are many reports on the wellbore drainage technology for the gas wells of water breakthrough,but most of them studied that in land gas wells and fractured or low-permeability gas reservoirs.Due to water breakthrough rules and platform space limitations,the drainage technology of offshore gas wells is various with that of land gas fields greatly.Wellbore drainage technology of the marine sandstone gas reservoirs developed by water drive in PY Gas Field in the eastern South China Sea is studied in this paper.Through the investigation of the main wellbore drainage technologies,its adaptability is analyzed in view of the gas well characteristics of the PY Gas Field and actual application of the offshore gas wells.Four process directions are determined as pipe string selection,electric pump drainage,liquid foam drainage,and continuous gas lift.And matching technologies are researched on the two most suitable ones,the electric pump drainage and the pipe string selection.The electric pump drainage for the gas well may be applied to the high-liquid production gas wells through efficient gas-liquid separation with downhole gas-liquid separators,special Y joints,special wellheads and other supporting downhole tools after process string modification.Aiming at the pipe string selection,PIPSIM software and KH fluctuation theory liquid-carrying calculation method are applied to get recommended gas production of different sizes of tubing based on the analysis of friction,erosion,and liquid-carrying three factors.When the gas well has lower current minimum liquid-carrying gas volume of the string,the 73.025 mm tubing is selected as the best string for replacement,which is suitable for the low-liquid production gas wells.This drainage supporting technology for the gas well can solve the wellbore drainage of different types of gas wells in this type of marine sandstone gas reservoir developed by water drive at different production stages.It is of practical significance in prolonging the production period of the gas wells and

关 键 词：井筒排液 海上气井 海相砂岩 电泵排液 优选管柱 

分 类 号：TE53[石油与天然气工程—油气田开发工程]