Showing papers by "Mexican Institute of Petroleum published in 1977"
TL;DR: In this paper, a model for the transient pressure behavior of vertical fractures was modified to include the effects of well-bore storage and fracture damage, and the results showed flat, almost horizontal lines that later become concave upward curves approaching the curve for undamaged fractures.
Abstract: A model recently presented by Cinco et al. for the transient pressure behavior of wells with finite conductivity vertical fractures was modified to include the effects of well-bore storage and fracture damage. An infinitesimal skin was considered around the fracture and it was handled as a dimensionless factor defined as (pi/2)(w/sub d//x/sub f/)(k/k/sub d/ - 1). It was found that the well behavior is importantly affected by the fracture damage. When plotted as a function of log p/sub wD/ vs. log t/sub D/ for short times, results show flat, almost horizontal lines that later become concave upward curves asymptotically approaching the curve for undamaged fractures. This behavior is shown even by slightly damaged fractures. Also, it was found that important information about the fracture characteristics may not be determined when well-bore storage effects are present. (24 refs.)
55 citations
TL;DR: In this paper, all electron, restricted Hartree-Fock calculations are performed on various configurations of a molecular compounds stimulating the reaction TiCl 4 · Al(CH 3 ) 3 +C 2 H 4 → TiCl4 · Al (CH 3 ), 2 · C 3 H 7, and a minimal basis set of contracted gaussians has been used to describe the molecular orbitals.
30 citations
TL;DR: In this paper, a molecular orbital description of the following reaction sequence is presented: the heterolytic breaking of a hydrogen molecule by the catalyst [PdCl 4 ] 2− complex with a subsequent substitution of a chlorine by a hydrogen, the coordination of the olefin to the planar [pdCl 3 H] 2−complex, the movement of the coordinated olemin through a collapse mechanism towards the hydride, and the final hydrogenation through an acid attack (HCl) on the Pd-alkyl bond liberating the alkane and regener
10 citations
TL;DR: In this article, the solubility parameters of five simple substances were calculated, for reduced between 0.4 and 1.0, using a generalized van der Waals equation of state. Satisfactory agreement with experimental results was obtained with adjustable temperatureexpansion coefficients for the effective molecular diameter and the mean-field parameter.
10 citations
TL;DR: In this article, the MOnte Carlo classical trajectory technique was employed to study reaction probability and energy transfer in collisions of sodium atoms with sodium dimers, where the relative amounts of initial relative translation, rotational, and vibrational energy were varied in order to study the effects of different partitionings of the total energy.
9 citations
Patent•
11 Jul 1977TL;DR: In this paper, an improved composition that retards setting in the cementing and recementing of oil well casings, which can be applied at depths that vary between 13123.4 and 21325.5 ft.
Abstract: The present invention relates to an improved composition that retards setting in the cementing and recementing of oil well casings, which can be applied at depths that vary between 13123.4 and 21325.5 ft. The retarding composition is constituted by the following ingredients: sodium or potassium carboxymethylcellulose; sodium tetraborate and Dextrine, it being characterized in that it also contains an inorganic acid such as boric acid.
8 citations
7 citations
TL;DR: Alumina supported platinum, palladium and bimetallic platinum-palladium catalysts have been investigated in the hydrogenolysis of n-hexane as discussed by the authors, and the results show that compared with platinum, the activity of bimetal catalysts is several times lower while the selectivity to hydrogenolytic products increases from 72 to 100%.
Abstract: Alumina supported platinum, palladium and bimetallic platinum-palladium catalysts have been investigated in the hydrogenolysis of n-hexane. Results show that, compared with platinum, the activity of bimetallic catalysts is several times lower while the selectivity to hydrogenolytic products increases from 72 to 100%.
7 citations