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Field application of phenol formaldehyde gel in oil reservoir matrix for water shut-off purposes

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Title Field application of phenol formaldehyde gel in oil reservoir matrix for water shut-off purposes
 
Creator BANERJEE, R
GHOSH, B
KHILAR, KC
BOUKADI, F
BEMANI, A
 
Description A few wells, from a major Western India on-shore oilfield, are either on the verge of being shut-in or have already been abandoned, due to excessive water-cut (WCT) levels. Low injectivity and extreme temperatures (149 degrees C) make it difficult for water shut-off by conventional polymer gel injection. A water thin monomer-based in-situ gelation system has been developed and successfully tried in one of the wells that ceased production due to 100% WCT The average production of 420 b/d with less than 1 % WCT in the 1(st) year of production back in 1996, declined to less than 8 b/d (with 98% WCT) prior to shut-in in year 2002. A rise in the oil-water contact (OWC) level in combination with a coning effect was diagnosed as a possible cause of the high WCT that was later controlled by a newly developed gelant treatment. In fact, the average post-treatment production for the first three months was nearly 200 b/d. Thereafter, production gradually stabilized in the neighborhood of I 1 b/d with a WCT of 48%. Cheap chemicals and a fast treatment method have resulted in a payback time span of 5 days and made an additional profit of 0.6 million US $. The watershut-off job resulted in an impressive commercial success; technical success, however, was less than satisfactory due to the fact that, in spite Qfusing a water-thin monomeric solution, only 40% of the designed volume could be injected due to low injectivity resulting in an abnormal pressure buildup. In addition to the gel development and treatment experiences, this article describes in detail the results of further lab investigations carried out to identify the possible reasons causing injection failure.
 
Publisher URBAN-VERLAG GMBH
 
Date 2011-09-01T08:40:09Z
2011-12-26T12:59:34Z
2011-12-27T05:51:55Z
2011-09-01T08:40:09Z
2011-12-26T12:59:34Z
2011-12-27T05:51:55Z
2006
 
Type Article
 
Identifier OIL GAS-EUROPEAN MAGAZINE, 32(4), 184-186
0342-5622
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12723
http://hdl.handle.net/10054/12723
 
Language en