石油钻探技术
石油鑽探技術
석유찬탐기술
PETROLEUM DRILLING TECHNIQUES
2015年
2期
44-49
,共6页
李霜%董波%孔方清%谢永斌
李霜%董波%孔方清%謝永斌
리상%동파%공방청%사영빈
防漏%乳化酸%压差卡钻%超深水平井%元坝气田
防漏%乳化痠%壓差卡鑽%超深水平井%元壩氣田
방루%유화산%압차잡찬%초심수평정%원패기전
mud loss-proof%emulsified acid%differential pressure sticking%ultra-deep horizontal well%Yuanba Gas Field
元坝气田水平井在钻进长兴组地层时常发生卡钻事故，采用常规泡酸易井漏且无法解卡。为解决该问题，在深入分析卡钻原因的基础上，研究了超深水平井防漏型乳化酸解卡技术。其基本思路是：利用乳化酸的缓速原理使酸液返至卡点位置，配合使用惰性堵漏材料来减缓形成漏失通道后的漏失速度，增长酸液与基岩的反应时间从而达到解卡的目的。通过室内试验形成了一套防漏型乳化酸配方，试验表明，该乳化酸与长兴组岩屑以及滤饼的酸溶率能分别达到50％和40％；酸液中的堵漏材料能有效提高封堵效果，封堵率达到99％；同时，乳化酸具有较好的缓速酸性能，破乳温度可达到140℃。该乳化酸在YB2051井长兴组地层压差卡钻中进行了试用，成功解决了卡钻问题。研究表明，防漏型乳化酸能解决高渗碳酸盐岩超深水平井中的压差卡钻问题。
元壩氣田水平井在鑽進長興組地層時常髮生卡鑽事故，採用常規泡痠易井漏且無法解卡。為解決該問題，在深入分析卡鑽原因的基礎上，研究瞭超深水平井防漏型乳化痠解卡技術。其基本思路是：利用乳化痠的緩速原理使痠液返至卡點位置，配閤使用惰性堵漏材料來減緩形成漏失通道後的漏失速度，增長痠液與基巖的反應時間從而達到解卡的目的。通過室內試驗形成瞭一套防漏型乳化痠配方，試驗錶明，該乳化痠與長興組巖屑以及濾餅的痠溶率能分彆達到50％和40％；痠液中的堵漏材料能有效提高封堵效果，封堵率達到99％；同時，乳化痠具有較好的緩速痠性能，破乳溫度可達到140℃。該乳化痠在YB2051井長興組地層壓差卡鑽中進行瞭試用，成功解決瞭卡鑽問題。研究錶明，防漏型乳化痠能解決高滲碳痠鹽巖超深水平井中的壓差卡鑽問題。
원패기전수평정재찬진장흥조지층시상발생잡찬사고，채용상규포산역정루차무법해잡。위해결해문제，재심입분석잡찬원인적기출상，연구료초심수평정방루형유화산해잡기술。기기본사로시：이용유화산적완속원리사산액반지잡점위치，배합사용타성도루재료래감완형성루실통도후적루실속도，증장산액여기암적반응시간종이체도해잡적목적。통과실내시험형성료일투방루형유화산배방，시험표명，해유화산여장흥조암설이급려병적산용솔능분별체도50％화40％；산액중적도루재료능유효제고봉도효과，봉도솔체도99％；동시，유화산구유교호적완속산성능，파유온도가체도140℃。해유화산재YB2051정장흥조지층압차잡찬중진행료시용，성공해결료잡찬문제。연구표명，방루형유화산능해결고삼탄산염암초심수평정중적압차잡찬문제。
Stuck drill pipe during the drilling of horizontal wells has become a common problem in the Changxing Formation of the Yuanba Gas Field .Conventional foamed acids are prone to lost circulation and cannot eliminate the risk of stuck drillpipe .In order to solve the problem of stuck drillpipes during horizon‐tal drilling ,a new technology using mud loss‐proof emulsified acid was tried in an ultra‐deep horizontal well after being developed by means of an in‐depth analysis of the cause .For the basic stuck drillpipe freeing principle ,it is important to recognize that acid fluids can return to stuck point by retarding of emulsified acids and inert circulation lost materials can be used to reduce mud loss rate so as to increase time of reac‐tion between acid fluids and base rock to release stuck drillpipe .A mud loss‐proof emulsified acid formula has been developed through laboratory tests .Test results show that the emulsified acid can achieve an acid solubility of 50% in cuttings and 40% in mud cakes of the Changxing Formation ;circulation lost materials of acid fluid system can effectively improve plugging effects with a plugging ratio up to 99% .Further ,the emulsified acid system achieved good retarded acid performance and its demulsification temperature can be as high as 140degrees .The emulsified acid has been successfully used in drillpipe stuck due to differential pressure in the Changxing Formation in Well YB 205‐1 .According to research results ,mud loss‐proof emul‐sified acid can solve differential pressure which causes drillpipe to get stuck in ultra‐deep horizontal wells in highly permeable carbonate rocks .
