Reservoir matrix

Strongly influences precipitation-dissolution reactions. Mixing of solutions with different pH often results in precipitation reactions. See also reservoir matrix below. 

An example of such a reservoir matrix system is a rate-controlling membrane coated solid solution beads comprising (1) a hydrophobic long-chain fatty acid or ester material (2) a surfactant and... 

Reservoir/matrix hybrid-type non-degradable polymeric implants are also available. Such systems are designed in an attempt to improve the M t1/2" release kinetics of a matrix system, so that release approximates the zero-order release rate of a reservoir device. Examples of these types of systems include ... 

Reservoir/matrix hybrid-type polymeric implants... 

What is the main reason for developing a reservoir/matrix hybrid-type polymeric implant ... 

There are many hazards involved in such operations untoward chemical reactions can arise between fluid and solid phases, leading to permeability impairment stresses may exceed the mechanical strength of the reservoir matrix vertical flows may arise because of fluid density differences that lead to rapid breakthrough of unwanted fluid. 

Manufacturing processes for reservoir, matrix and drug-in-adhesive transdermal systems are largely similar and involve the following stages ... 

Mixing drug (and any other excipients) with reservoir, matrix or adhesive ... 

The chemistry of and physical mechanisms controlling the recovery of petroleum are better understood now than at any previous time yet, an extremely large amount of work remains before recoveries can be predicted with certainty. Part of this uncertainty arises from the undetermined variables of the heterogeneous reservoir matrix from which oil is produced and partly from simply not understanding the total interrelationship of the forces acting on the fluids in the reservoir. New chemical techniques and ideas for measurement undoubtedly will develop from the kinds of studies reported in this publication the result will be the achievement of a more efficient recovery of our petroleum resources. 

According to the revised Terzaghi s effective stress principle, the equilibrium equation of the reservoir matrix can be written... 

Patches are made into various structures and forms [1]. They are largely divided into reservoir, matrix, pressure sensitive (PSA) and tape types (see Fig. 1). In the reservoir type, the reservoir in the form of a liquid or a gel is... 

Injection of polyacrylamide continued for 7 days, at which time the well was shut in and backproduced at a rate of approximately 80 B/D. The viscosity and screen factor from backproduced samples within the reservoir matrix were measured. After 1 day of backpro-duction, polymer injection resumed at 301 B/D to ensure that the injection pressure did not exceed its prebackflow value. (There was... 

To estimate the maximum rate polymer can be injected, the maximum polymer stretch rate was calculated to occur in the reservoir matrix just outside the perforations. The difficulty in estimating the true velocity (and hence shear degradation) of the polymer bank in the reservoir is the uncertainty in diameter of the perforations and the extent they protrude into the sand matrix. Calculations based on Maerker s work indicate that the sandpack data of Fig. 5 should undergo a 78% reduction in screen factor at 352 ft/D (true velocity). 

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