川西地区精细控压压力平衡法固井技术研究与应用
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摘要
川西超深井固井面临封固井段长、同一裸眼井段存在多压力系统,安全密度窗口窄,采用常规固井,在满足顶替效率的前提下,必然造成井漏;若采用正注反打工艺,固井质量又难以满足后期改造需求。为此,开展了超深井固井井段压力窗口值测试、保证顶替效率条件下的施工排量模拟、保证压稳和防漏的浆柱结构优化和井口压力控制的研究,初步形成了一套超深井精细控压平衡法固井技术。该技术在川西地区5口井开展现场试验,取得了较好的效果,固井平均合格率达90. 52%,因而这项技术具有广阔的应用前景。
Cementing in ultradeep wells in western Sichuan is featured with long cementing intervals,multiple pressure systems in a single openhole interval,and narrow fluid density safety window. Adopting conventional cementing will often lead to lost circulation if displacement efficiency is to be ensured. And the cementing quality will not be good enough for later stimulation need if cement pumping through both casing and annulus.Therefore study is made on how to measure pressure window at the interval to be cementing,how to simulate to determine the pump rate on condition the displacement efficiency ensured,and the cementing string optimization and wellhead pressure control ensuring no kick no loss,and a set of precise managed pressure cementing method is set up for ultradeep wells. It has been used in five wells in CX and good results have been achieved. The average cementing success rate is 90. 52%. This technology will hav a broad application prospect.
Cementing in ultradeep wells in western Sichuan is featured with long cementing intervals,multiple pressure systems in a single openhole interval,and narrow fluid density safety window. Adopting conventional cementing will often lead to lost circulation if displacement efficiency is to be ensured. And the cementing quality will not be good enough for later stimulation need if cement pumping through both casing and annulus.Therefore study is made on how to measure pressure window at the interval to be cementing,how to simulate to determine the pump rate on condition the displacement efficiency ensured,and the cementing string optimization and wellhead pressure control ensuring no kick no loss,and a set of precise managed pressure cementing method is set up for ultradeep wells. It has been used in five wells in CX and good results have been achieved. The average cementing success rate is 90. 52%. This technology will hav a broad application prospect.
引文
[1]杨博仲,汪瑶,叶小科.川西地区复杂深井钻井技术[J].钻采工艺,2018,41(4):27-30.
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[9]郭继刚.精细动态控压固井技术在顺南区块的应用[J].钻井液与完井液,2016,33(5):76-79.
[2]周峰,左星,李明宗.精细控压钻井技术在高石001-H2的实践与认识[J].钻采工艺,2017,40(5):19-21.
[3]马勇,郑有成,徐冰青,等.精细控压压力平衡法固井技术的应用实践[J].天然气工业,2017,37(8):61-65.
[4]马勇,姚坤全,付华才,等.非常规条件下超深漏失井尾管固井作业---以云安002-7井为例[J].天然气工业,2012,32(9):71-73.
[5]周英操,杨雄文,方世良,等.PCDS-I精细控压钻井系统研制与现场试验[J].石油钻探技术,2011,39(4):7-10.
[6]赖敏斌,樊洪海,彭齐,等.井底恒压控压钻井井口回压分析研究[J].石油机械,2015(11):13-17.
[7]Syltoy S,Eide S,Berg P,et al.Highly Advanced Multitechnical MPD Concept Extends Achievable HP/HT Targets in the North Sea[M].Society of Petroleum Engineers,2008.
[8]晏凌,吴会胜,晏琰.精细控压钻井技术在喷漏同存复杂井中的应用[J].天然气工业,2015,(2):59-63.
[9]郭继刚.精细动态控压固井技术在顺南区块的应用[J].钻井液与完井液,2016,33(5):76-79.