Polymer plugging

Pressure Relief Valve for Polymer Plugging Service... 

Another example a solvent was put into a small reactor to remove some polymer, which was stuck to the walls. Some monomer, which was trapped behind the polymer, reacted with the solvent, and the pressure rose. Bits of polymer plugged the relief valve, and the pressure broke a glass connecting line [8]. 

Polymer plugs Used also for other tasks... 

V. A. Blazhevich, D. A. Khisaeva, V. G. Umetbaev, and I. V. Legostaeva. Polymer plugging solution for oil and gas wells—contains urea-formaldehyde resin, and aluminium chloride containing waste of isopropylbenzene production as acid hardener. Patent SU 1763638-A, 1992. 

S. A. Ryabokon and V. V. Goldshtein. Prospects of developing polymer plugging agents. Neft Khoz, (5) 7-13, May 1989. 

Campbell and Dontula [1] revisited the original solids conveying problem. They proposed that the flights of the screw cause the movement of the solids down the screw, and that the polymer pellets behaved more like an elastic fluid than a solid polymer plug. Therefore, a torque balance would not be applicable. The following is a list of the additional assumptions they made ... 

BP Chemicals, Ltd. Polyethylene Ethylene, comonomers Low Capex and Opex for homo, random and impact co-polymers. "Plug" flow reactor gves quick grade changes and excelent impact co-polymers 24 2000... 

Mechanical entrapment occurs when larger polymer molecules cannot pass through smaller pore throats. On the other hand, hydrodynamic retention occurs when the polymer concentration increases at pore entrances, thereby reducing the polymer translational diffusion rate. In severe circumstances when the polymer solution contains microgels, hydrodynamic retention can result in cake formation leading to polymer plugging. 

The apparatus involved in this method is related to that of SICM, except that the micropipette is blocked by a permeable polymer plug, and connected to the inlet of a differentially pumped quadrupole mass spectrometer... 

Eastman Kodak Company received a patent (U,S. Patent 6,164,810) on a barrier screw with a vent hole located within about two diameters from the end of the feed section, between a main flight and a barrier flight. The vent hole is located such that there is little chance of polymer plugging the vent hole. The volatiles are vented out to the back of the screw through an axial bore. This screw design can be used to process PET powder into film. 

A silicon wafer, coated with a layer of deuterated polymer, is clamped ce down on to the surface of the polymer plug. The cell is heated by means of thermostated cartridge heaters in the brass base and has been designed such that the neutron beam passes through the silicon wafer, with approximately 90 per cent transmission. Thin films of the deuterated semi-crystalline polymers are prepared by spin casting hot solutions of the polymer directly onto the polished silicon substrate. 

Treiber, L.E. and Yang, S.H. 1986. The Nature of Polymer Plugging and a Wellbore Treatment to Minimize It. Paper SPE 14948 presented at the SPE Enhanced Oil Recovery Symposium, Tulsa, 20-23 April. DOI 10.2118/14948-MS. 

The Nature of Polymer Plugging and a Wellbore Treatment To Minimize It... 

This paper presents the results o a study of the factors involved in wellbore plugging by clean polymer solutions. Plugging of injection wells can have a very detrimental effect on the economics of polymer flooding. Polymer plugging was found to be a function of the following four factors ... 

Because of this, the opportunity exists for polymer plugging. 

Most laboratory design studies of a polymer flood involve the measurement of the effective viscosity of polymer solutions in representative field cores. Polymer plugging often may not be observed because such a test typically involves only a relatively small number of pore volumes of polymer injection. There is little information in the literature about polymer plugging in cores, or polymer related field injectivity loss. Omar indicated that shaly sands adsorb more polyacrylamide per unit of surface area than do clean sands. He suggested that the difference was due to the platelet edge charges of shaly sands. Duane and his coworkers reported that Shell s Coalinga polymer demonstration project had loss of polymer injectivity. 

In the studies of the nature of polymer plugging and of the organic cation treatment, only 1/4 in. diameter cores were used, and the injection system is shown in Figure 1(b). 

The wellbore area is crucial in determining when polymer plugging starts during polymer injection. 

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