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Results
A Study on Synthetical Relieving Plug Agent for Steam Huff-puff Wells in the Watersensible Formation
Biao, Wang (Scientific Research Institute of Petroleum Exploration and Development, Beijing, China) | Yunxin, Cheng (Scientific Research Institute of Petroleum Exploration and Development, Beijing, China) | Yinxue, Jian (Heavy Crude Department, Liaohe Oil Field, China) | Zimian, Hu (Heavy Crude Department, Liaohe Oil Field, China)
Abstract A great quantity of crude is heavy crude oil which has been produced by using steam huff-puff method in Liaohe Oil Field. This kind of crude contains a lot of resin-asphaltene and possesses the property of very high viscosity (4537 mPa.s at 50 C) and specific gravity (0. 9566 - 0. 9611). The formation is not only very sensible to water, but also damaged by fluids of drilling mud. Through injecting steam, the production rate was still very low and duration of steam huff-puff was very short because of plugs which were formed by clay swelling and the residual hydrocarbon that produced by volatilization of light fraction of heavy crude around wellbore. This paper offered a synthetical relieving plug agent which is a mixed fluid, containing organic mixed solvent, inorganic acid, surfactant and other additives. The synthetical relieving plug agent (ARP, - 8801 and BJ - 30) has been successfully used in 37 wells in Shuguang No. 48 union, Liaohe Oil Field since April 1989. According to the statistical data, obtained from 33 experiment wells, it has been sown that the ARP - 8801 and BJ - 30 synthetical relieving plug agent has excellent relieving plug ability for the heavy crude wells of using steam huff-puff method in watersensible formation. The production rate per well was increased on an average from 0 - 8.6 tons/day (before treatment) to 6.0 - 26.7 tons/day (after treatment). The duration of steam huff-puff was in- creased on an average from 121 days (before treatment) to 218 days (after treatment). The oil/steam ratio increased from 0.41 (before treatment) to 1.17 (after treatment). The cumulative incremental oil production has reached 41704 tons. P. 701
- Asia > China > Liaoning Province (0.45)
- North America > United States > Texas (0.28)
- Energy > Oil & Gas > Upstream (1.00)
- Materials > Chemicals > Commodity Chemicals > Petrochemicals (0.89)
- Asia > China > Liaoning > Bohai Basin > Liaohe Basin > Liaohe Field (0.99)
- North America > United States > Gulf of Mexico > Central GOM > East Gulf Coast Tertiary Basin > Green Canyon > Block 237 > Green Canyon 237 Field > Wang Well (0.97)
Abstract This paper relates to tertiary recovery employing a polymer thickened aqueous drive fluid or mobility control fluid, more particularly, this paper relates to a novel type of thickening agent named AST agent for drive fluid composed of a hydrophobically associating terpolymer (PAAE) and a stabilizer (AN). AST thickening agent exhibits good thermal stability (at 100 C, thermal aging in 33000 mg/l brine) and electrolytic tolerance (salinity ranging from 16500 mg/l to 66000 mg/l) and good resistance to shear relative to the conventional water-soluble polymers such as polyacrylamide, acrylamide/acrylic acid copolymer etc., and furthermore, AST agent has some surface activity. Many laboratory experiments have been shown that AST thickening agent could be considered as an advanced one in comparison with the conventional water-soluble polymers. Especially AST thickening agent is more suitable for a mobility control fluid in the hostile environment in subterranean formations such as in high salinity and high temperature formations. Introduction It's well known that conventional water-soluble polymers such as polyacrylamide, acrylamide/acrylic acid copolymer, sodium polyacrylate and the like are more efficient thickeners in deionized water but they all suffered from many serious deficiencies or limitations in actual use for EOR. For example, the thickening ability of above-mentioned polymers is greatly reduced by the presence of electrolytes such as sodium chloride, calcium chloride and magnesium sulfate etc. in ground waters in subterranean formations. In addition, in many applications, the aqueous medium thickened with water-soluble polymer usually is exposed to temperatures in the range of 30 C to l00 C for a long time. In such a case, its viscosity will be reduced. P. 667
Abstract EMS, a complex type of pour point-viscosity depressant for crudes, is composed of EVA, MVA and Surfactant. Mter adding EMS into the crudes, a very nice result in reducing pour point and viscosity for Daqing, Jianghan and Jidong crudes was got. From the research result of infrared spectrum of interaction between EMS or its components and wax or mIxture of resin and asphaltene isolated from three crudes above-mentioned, it has been shown that the area ratio of the double absorption peaks of 719 cm-1 and 729 cm-1 or 1368 cm-1 and 1378 cm-1 changed remarkably after EMS or its components were added into wax. It can be inferred that the cocrystallization probably happened between the EMS or its components and the wax. The position of 4000-3000 cm-1 infrared absorption peak of the mixture of resin and asphaltene moved to the lower wavenumber, and the ratio of the area of 1373 cm-1 absorption peak (methyl) to the combination area of 748, 810 and 871 cm-1 absorption peak (aromatics) increased remarkably. It can be inferred that the pour point-viscosIty depressant molecules destroyed the original hydrogen bonds and overlapping of the aromatic ring planes among resin and asphaltene molecules to form new cubic molecular structure and new hydrogen bonds. With the results the viscosity of crude oil will be reduced. Introduction The reduction of pour point and viscosIty is such a problem which is very important and eager to solve for the production and transportation of high wax content crudes and asphaltic base crudes, in the world, the methods of heating crude oil and forming o/w emulsion etc, are primary methods for the production and transportation of high wax content crudes and asphaltic base crude, all of these methods are not ideal because there is a great need of fuel consumption for the first method and a further treatment of emulsion for the second method. P. 715
- Materials > Chemicals > Commodity Chemicals > Petrochemicals (1.00)
- Energy > Oil & Gas > Upstream (1.00)