川中须家河气藏泡排技术研究与应用

The Research and Application of Foam-Dewatering Technology in Xujiahe Gas Reservoir of Mid-Sichuan Gas Field

关键词:  泡排  CT5-7CⅢ  现场试验  须家河

Key words:  Xujiahe gas reservoir  foam-dewatering  de-emulsion  condensate oil

摘要:

川中须家河气藏是川渝地区近年勘探开发的重点区块之一,为川渝气田上产的主要接替层系。随着该气藏的开发,一些低产气井由于带液能力不足而在井底形成积液,导致生产异常,部分井甚至只能进行间歇生产。针对气藏地层水矿化度高、Ba2+含量高,较多的井产凝析油的特点,开展了泡排配套技术的研究。研制了耐高矿化度、抗Ba2+沉淀、抗油的CT5-7CⅢ起泡剂,研制了在常温下破乳速度快、破乳彻底、油水界面清晰、可配入消泡剂进行加注的水溶性CT1-12A破乳剂,研究形成了适合现场生产工艺特点的应用技术。进行了7口井的泡排现场试验和3个集气站的破乳现场试验,增产天然气约2.79×104m3/d,增产水约40m3/d。现场试验表明,研制的泡排药剂体系具有泡排及破乳效果好、药剂加注设备少等特点,在满足泡排的同时不会影响凝析油的回收。

Abstract:

Xujiahe gas reservoir of mid-Sichuan gas field is one of the most important exploration and development area and the main supersede layer system.With the development of the gas reservoir,some wells of gas yield is lower produce unconventionally and some wells can only produce intermittently,because their water-unloading ability can’t completely lift the formation water from the wells and accumulate in the downhole.In allusion to the character of high salinity,containing Ba2+ and condensate oil,we develop the foam-dewatering matched technology.We develop a CT5-7CⅢ foaming agent,which can bear high salinity,Ba2+ and condensate oil,and a water-solubility CT1-12A demulsifying agent that can break the emulsion quickly and entirely in environment temperature,can mix with the de-foaming agent.At the same time,we develop a spot application technology.Using these agents,we had made foam-dewatering field experiments in seven wells and de-emulsion field experiments in three gas stations,increase daily gas 2.8×104m3 and formation water 40m3.The field experiments indicate that the foaming agent’s characters of foam-dewatering are very well,the emulsion is broken quickly and entirely,and the spot technics is very predigest.