Abstract
Aimed on the problem that the Drilling fluids were easily intruded by the saline water in high-pressure salt-gypsum formations, and the properties of the drilling fluid were damaged and accidents easily occur. The mechanism of drilling fluid contamination by the formation brine was analyzed and the capacity limits of the contamination were found out. The results show that small amount of brine invasion causes emulsification while large amount of brine invasion lead to demulsification. Two capacity limitations were proposed. The first limitation is 10% of saline water concentration, below which the performance of the drilling fluid remains relatively good. The second limitation is 30% of saline water concentration, below which the drilling fluid needs to be systematically maintained, and after which the fluid has no potential for maintenance. This proposal has been successfully used in 8 wells in Kuqa foreland area, and the drilling cycle was saved by 35 days on average.
Highlights
EULQH WKH LQYDVLRQ SHUIRUPDQFH RI GULOOLQJ IOXLG ZLOORI EULQH LQYDVLRQ DQG WKH FDSDFLW\ OLPLW RI KLJKGHQVLW\ RLOEDVHG GULOOLQJ IOXLG DIIHFWHG E\ EULQH LQYDVLRQ DUH QRW FOHDU ZKLFK FDQ QRW HIIHFWLYHO\ JXLGH GULOOLQJ RSHUDWLRQ 7KHUHIRUH WKH ODERUDWRU\ H[SHULPHQWV DQG PHFKDQLVP DQDO\VLV DUH XVHG WR LPSURYH WKH XQGHUVWDQGLQJ RI WKH PHFKDQLVP DQG FDSDFLW\ OLPLW RI EULQH FRQWDPLQDWLRQ RI GULOOLQJ IOXLG DQG WR JXLGH WKH ILHOG RSHUDWLRQ.
WKLFNHQ UHVXOWLQJ LQ WKH LQFUHDVH RI OXEULFDWLRQ:KHQ D VPDOO DPRXQW RI EULQH LV LQYDGHG LQWR RLOEDVHG GULOOLQJ IOXLG WKH YLVFRVLW\ GHFUHDVHV VORZO\ DQG WKH ILOWUDWLRQ ORVV LQFUHDVHV VORZO\ 7KH V\VWHP VWLOO KDV D KLJK GHPXOVLILFDWLRQ YROWDJH ZKLFK LQGLFDWHV WKDW WKH LPPHUVHG EULQH DQG WKH H[FHVVLYH HPXOVLILHU LQ WKH V\VWHP IRUP D UHODWLYHO\ VWDEOH HPXOVLRQ.
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
Summary
RI EULQH LQYDVLRQ DQG WKH FDSDFLW\ OLPLW RI KLJKGHQVLW\ RLOEDVHG GULOOLQJ IOXLG DIIHFWHG E\ EULQH LQYDVLRQ DUH QRW FOHDU ZKLFK FDQ QRW HIIHFWLYHO\ JXLGH GULOOLQJ RSHUDWLRQ 7KHUHIRUH WKH ODERUDWRU\ H[SHULPHQWV DQG PHFKDQLVP DQDO\VLV DUH XVHG WR LPSURYH WKH XQGHUVWDQGLQJ RI WKH PHFKDQLVP DQG FDSDFLW\ OLPLW RI EULQH FRQWDPLQDWLRQ RI GULOOLQJ IOXLG DQG WR JXLGH WKH ILHOG RSHUDWLRQ.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
