Isolation packers

They are not necessarily stand-alone methods, as coiled-tubing injection and ball sealers can be combined with isolation packer systems. 

Mechanical placement with isolation packer systems allows for the injection of acid within a limited treatment interval at one time. Other treatment intervals within the total zone can be treated individually in stages. Figure 6-3 depicts the treatment of a bmited interval with coiled tubing through a packer setting. 

Isolation packers for use in acid stimulation are effective in a well completion only if acid will enter perforations and continue flowing into the formation. If a poor cement job is present, acid may channel vertically along the cement/formation interface, defeating the purpose of mechanical placement. Of course, mechanical placement of add with packer systems is valid only in perforated, cemented pipe completions. As of this writing, reliable mechanical placement techniques for small-diameter, monobore (slimhole) completions do not exist. 

Paralleling the corrosion problem is one involving compatibility of any well fluid with nonmetallic materials used in well completion apparatus. All injection wells and many producing wells are equipped with packers to isolate the casing annulus from the high temperature, pressure, and salinity characteristic of the petroleum reservoir environment. Conventional packers, as well as other well tools, utilize elastomeric materials to mechanically seal appropriate locations. 

Inflate straddle packer to about 90 psi to isolate zone of interest... 

Basically, the drill stem test involves attaching a tubing assembly to the end of the drill pipe, isolating the lest zone with rubber packers, and perforating the zone. The tool is then opened so that the fluids or gas in die formation can How up the drill pipe for metering at the surface. During this process, extensive pressure measurements are taken, which can help to indicate the extent of the reservoir and the rate at which the hydrocarbons could be recovered. Prior to describing how a well is finally completed (if the hole is not dry ), it is in order to describe the forces utilized to transfer the oil from the reservoir to the surface. 

Submersible centrifugal pumps are now available with integral packers that allow the screened interval of the well to be isolated from the stagnant column above, thus negating purging requirements and reducing sampling times and costs. 

Qureshi, A.A., Mo, H., Packer, L., and Peterson, D.M. 2000. Isolation and Identification of Novel Tocotrienols from Rice Bran with Hypocholesterolemic, Antioxidant and Antitumor Properties. J. Agric. Food Chem. 48 3130-3140. 

N. Haramaki, D.B. Stewart, S. Aggarwal, H. Ikeda, A.Z. Reznick and L. Packer, Networking antioxidants in the isolated rat heart are selectively depleted by ischemia-reperfusion, Free Radic Bio Med 25(3), 329-339(1998). 

Tests may also be made in portions of a drill hole isolated by one or more packers, as shown in Fig. 15.2. This figure and the procedure described are taken from the Bureau of Reclamation s Earth Manual, 1st edition [1]. 

Sealing isolated cracks and construction joints is more generally done by pumping grout through packers placed in drilled holes. The following excerpt from the engineer s report describes typical field procedures ... 

Borehole FEBEX 95.002, with a diameter of 86 mm and a length of 132.36 m, was equipped with packers to isolate sections in which pore water pressures could be monitored. 

QURESHI, A.A., HUANBIAO, M., PACKER, L., PETERSON, D. Isolation and identification of novel tocotrienols from rice bran with hypocholesteremic, antioxidant and antitumor properties, J. Agric. Food Chem., 2000, 48, 3130-3140. CHUNG, H.S., WOO, W.S., A quinolone alkaloid with antioxidant activity from the aleurone layer of anthocyanin-pigmented rice, J. Nat. Prod., 2001, 64, 1579-1580. 

It seems that the earliest research in coordination chemistry performed in Australia was by Masson and Steele at Ihe University of Melbourne in 1896. Sir David Orme Masson was Rofessor of Chemistry in Melbourne (1886-1924). Bertram Steele later worked with Sir William Ramsay at University College, London and became Foundation Professor of Chemistry at the University of Queensland, Brisbane. Their paper, "The blue salt of Fehling s solution and other cuprotartrates" ), reported that the deep blue color of Fehling s solution was due to an anionic copper species. This work was not extended further until 1920 when Masson put his research students Packer and Wark to work on cuprotartrates they confirmed Masson and Steele s results and isolated several cuprotartrates ). Ian William (later Sir Ian) Wark extended Uiis work further in his RiD studies at University College, Londtmf ). John Packer subsequently became Professor of Chemistry at Canterbury University College, Christchurch, New Zealand in 1944. 

Inflate packer(s) to reduce well volume and isolate inlet from settled particles at well bottom or floating NAPL at the surface. 

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