A system for determining a characteristic of a stream of gas flowing through a branch wellbore of a multilateral wellbore system including a main wellbore extending from surface into the earth formation and a plurality of branch wellbores, each branch wellbore being provided with a conduit for passage of a stream of hydrocarbon gas from the earth formation to the main wellbore, the system comprising a plurality of sound generating devices, each sound generating device being arranged in a corresp...

Process for the preparation of a macramer suitable as a stabilizer precursor in a polymer polyol, which process comprises reacting a polyol with a cyclic dicarboxylic acid anhydride not containing any polymerizable double bond, and subsequently reacting the adduct thus obtained with an epoxide compound containing a polymerizable double bond. The macromers can be applied for the preparation of polymer polyols which are, in turn, very suitable for manufacturing flexible polyurethane foams.

Disclosed is a process for manufacturing an aromatic diacid in one step with a single catalyst system which comprises: a) Introducing into a reactor an aromatic hydrocarbon containing the number of rings desired in the product diacid with one or more alkyl groups attached to the rings; b) Reacting said aromatic hydrocarbon in the presence of an oxidant supply and a single catalyst system comprising at least one catalyst selected from Group IB, IIB, VB, or VIIB of the Periodic Table, in a reactio...

One or more subterranean zones are isolated from one or more other subterranean zones using a combination of solid tubulars and slotted tubulars.

Process of producing polytrimethylene terephthalate (PTT) by esterification of terephthalic acid (TPA) with trimethylene glycol (TMG) in the presence of a catalytic titanium compound, precondensation and polycondensation. The sterification is effected in at least two stages, where in the first stage a molar ratio of TMG to TPA of 1.15 to 2.5, a content of titanium of 0 to 40 ppm, a temperature of 240 to 275.degree. C., and a pressure of 1 to 3.5 bar are used. In the at least one subsequent stage...

Grease composition for constant velocity joints comprising a base oil and urea-based thickener, which grease further comprises, (A) from 0.1 to 10% by weight of an optionally substituted molybdenum-organocyclic compound containing at least 5 ring atoms, wherein each ring atom attached directly to the molybdenum atom is a hetero atom, (B) from 0.1 to 5% by weight of at least one sulphur-containing additive chosen from the group consisting of sulphur olefins, sulphur-phosphorus extreme-pressure ag...

A method of retrievably deploying an electrically driven downhole well fluid transducer system, such as an electrical submersible pump (ESP), comprises installing a production tubing, which is equipped near its lower end with one part of a wet mateable electrical connector and an external electric conduit, and subsequently lowering the fluid transducer system, which is equipped with another part of a wet mateable electrical connector through the tubing until the wet mateable connector parts enga...

A solid, particulate catalyst composition is provided containing an active nickel component in which the nickel constitutes from about 25 to about 60 wt % of the catalyst composition; a molybdenum component in which the molybdenum constitutes from about 5 to about 20 wt % of the catalyst composition; and a binder component comprising at least one of oxides of silica, zirconium, aluminum, zinc and calcium, each of the calcium, aluminum and zinc being present in an amount no greater than about 2 w...

A method is provided for determining the rotational stiffness of a drill string for drilling of a borehole in an earth formation, the drill string having a bottom hole assembly (BHA) and an upper end driven by a rotational drive system. The method comprises the steps of determining the time derivative of the drill string torque during drilling of the borehole at a selected time when stick-slip of the BHA occurs, determining the nominal rotational speed of the drill string at an upper part thereo...

This invention relates to a process for the preparation of a catalyst having improved properties, the process comprising selecting a carrier, lowering the concentration of ionizable species present on the surface of the carrier, and depositing a catalytically effective amount of one or more catalytically reactive metals on the carrier. The invention further relates to catalyst made from the process.