Mobil

About: Mobil is a based out in . It is known for research contribution in the topics: Catalysis & Zeolite. The organization has 7085 authors who have published 10642 publications receiving 237497 citations. The organization is also known as: Socony-Vacuum Oil Company & Standard Oil Company of New York.

Method for maximum in-situ visbreaking of heavy oil

Abstract: A method for the recovery of viscous oil from a subterranean, viscous oil-containing formation by injecting steam into the formation via at least one well at a sufficient temperature, rate, and in a sufficient amount to effect maximum visbreaking of the oil in place, terminating injection of steam and producing fluids including oil through the same well used for injecting steam. The injection-production cycle may be repeated for a plurality of cycles until the ratio of oil/water in the produced fluids is unfavorable.

Synthetic porous crystalline mcm-49, its synthesis and use

Abstract: This invention relates to a new synthetic porous crystalline material, a method for its preparation and use thereof in catalytic conversion of organic compounds. The new crystalline material exhibits a distinctive X-ray diffraction pattern.

Cement Sheath Stress Failure

Abstract: Observation of the sudden appearance of annular pressure in wells exposed to high temperature changes on excessive internal casing pressure prompted a laboratory investigation to simulate conditions under which cement sheath failure could occur and thereby define the causes, characteristics, and limits of the problem This paper discusses cement sheath failure which is manifested by interzonal annular-fluid movement and abnormally high annular pressure at some point behind the casing up to and at the surface Cement sheath failure can be observed in any producing area where excessive flowing temperatures exist at the surface or where excessive internal casing test pressures are used The detrimental effects of cement sheath failure are numerous and may include lost revenue from lost production, potentially hazardous rig operations

On characterizing the “knee” of the Pareto curve based on Normal-Boundary Intersection

Abstract: This paper deals with the issue of generating one Pareto optimal point that is guaranteed to be in a “desirable” part of the Pareto set in a given multicriteria optimization problem. A parameterization of the Pareto set based on the recently developed normal-boundary intersection technique is used to formulate a subproblem, the solution of which yields the point of “maximum bulge”, often referred to as the “knee of the Pareto curve”. This enables the identification of the “good region” of the Pareto set by solving one nonlinear programming problem, thereby bypassing the need to generate many Pareto points. Further, this representation extends the concept of the “knee” for problems with more than two objectives. It is further proved that this knee is invariant with respect to the scales of the multiple objective functions. The generation of this knee however requires the value of each objective function at the minimizer of every objective function (the pay-off matrix). The paper characterizes situations when approximations to the function values comprising the pay-off matrix would suffice in generating a good approximation to the knee. Numerical results are provided to illustrate this point. Further, a weighted sum minimization problem is developed based on the information in the pay-off matrix, by solving which the knee can be obtained.