Abstract: Systems and methods are provided for estimating and/or using drilling efficiency parameters of a drilling operation. A method for estimating drilling efficiency parameters may include using a borehole assembly that includes a drill bit to drill into a geological formation. A number of measurements of weight-on-bit and torque-on-bit may be obtained during a period in which weight-on-bit and torque-on-bit are non-steady-state. The measurements of weight-on-bit and torque-on-bit may be used to estimate one or more drilling efficiency parameters relating to the drilling of the geological formation during the period.

Abstract: Systems and methods are provided for estimating and/or using drilling efficiency parameters of a drilling operation. A method for estimating drilling efficiency parameters may include using a borehole assembly that includes a drill bit to drill into a geological formation. A number of measurements of weight-on-bit and torque-on-bit may be obtained during a period in which weight-on-bit and torque-on-bit are non-steady-state. The measurements of weight-on-bit and torque-on-bit may be used to estimate one or more drilling efficiency parameters relating to the drilling of the geological formation during the period.

Abstract: Method of calibration intended to be used in a process of determining the content of a plurality of compounds contained in a drilling fluid, the method comprising obtaining a calibration mud; performing a gas extraction from said calibration mud with at least two extraction stages in order to obtain at least two extracted gases; measuring parameters representative of the quantities of said calibration compounds in said extracted gases; and calculating correction factors using said measured parameters, the correction factors being intended to be used in said process.

Abstract: A method for the extraction of a gas fraction of each compound, the measurement of information representative of the gas fraction of each compound and the calculation, for each first compound of a first group of compounds, of the content of said first compound in the drilling fluid on the basis of information measured for the gas fraction of the first compound and on the basis of a first correction factor (?i).

Abstract: The invention is a method for modeling the effects of interactions between wells on the watercuts in effluents produced by one or more wells through a zone of an underground hydrocarbon reservoir under development, swept by a fluid under pressure injected through one or more injection wells or swept by water from an aquiferous zone, in order to optimize the reservoir production. The method includes selecting a set of significant data from measurements taken from sweep fluid injection records and from records relative to the effluents produced by a series of wells of the zone, and setting up, by means of iterations, an optimized linear model connecting the variations with time of these watercuts with the variations with time of the significant data. The invention is useful to optimize the petroleum production of a reservoir.

Abstract: A process and a device for creating production logs in a gushing well. A seal permits measurement of at least part of the upstream flow and/or downstream flow in the well relative to the seal. The pressure differential is monitored on either side of the seal.

Abstract: A device for pumping a fluid of high viscosity containing a gas and a liquid phase which includes a pump connected to a lower end of a tubular string at the bottom of a well and a device for separating free gas from the liquid phase and for injecting a thinner into the fluid to reduce the viscosity. Injection of the thinner is effected at fluid inlet ports of an inlet device for separating the free gas via a pipe leading to the surface of a geological formation in which the well is positioned. Also, a pumping method using the device involves injecting the thinner into the fluid of high viscosity near an inlet of the pump.

Abstract: A deflected drain (2) drilled in a producing zone (1) is equipped for the production of effluents and fitted with a perforated casing (3) and with a tubing (4). A depression is applied in different locations by selectively changing the position of the application points in relation to these locations. The position of the suction ports and/or the area thereof is varied through the selective opening of valves (8) or by displacing the inlet of the tubing (4). A tubing and/or a casing with perforations such that a determined distribution of the depression is obtained can be used. The depression can be produced by a pumping assembly (5) intercalated on the production tubing (4).

Abstract: The method relates to the application to a deflected well (1) of a well-known consolidation process through the polymerization in situ of a liquid substance (L) injected within a zone (2) to be consolidated through an injection pipe (5), by interaction with a reacting gas G injected thereafter. In order to limit the zone of intervention and to properly distribute the substance and the gas all over this zone, a combination of a pipe whose wall is fitted with openings (11) all over the end part thereof (5a), a confining packer (8) and a solid separation element (10) displaced in the pipe after the liquid substance by the reacting gas, which prevents any interaction of the reacting gas before it reaches the zone to be consolidated, is used. Injecting the liquid mixture comprises successive stages of circulation between the inside of pipe (5) and the annulus between the pipe and the well (1) and of forcing to have it make through the formation properly.

Abstract: A method of use of a logging tool (1) including a directional emission device (4) and/or reception device (R1, R2) and the achieving of several series of loggings while modifying between each series the orientation of the directivity diagrams. At least one first series is performed by orienting the directivity diagrams towards the top or the wall of a reservoir zone crossed through by the well bore, for example. At least one second series is carried out by orienting the directivity diagrams towards the opposite direction, for example. The recordings are then combined, and the reflected arrivals, which are generally concealed by casing waves, can be easily seen. This facilitates the locating of further discontinuities. The directional selectivity of the emissions and/or the receptions is, for example, obtained by positioning a cover fitted with a window (5) around emitting and/or receiving transducers. The method can be applied to loggings in horizontal well bores, for example.

Abstract: In a drain (2) fitted with a perforated casing (3), a fluid under pressure is injected in various locations by selectively changing the position of the injection points in relation to these locations by means of a pipe (4). The position of the injection ports and/or the area thereof is varied through the selective opening of valves or by displacing an injection pipe (4). The density of the perforations of the casing (3) and/or of the injection pipe (4) can also be varied. A sweeping of the reservoir crossed by the drain is achieved by injecting for example a hot gaseous fluid such as steam under pressure and the density of the perforations (11) of a pipe (4) is for example selected in such a way that the amount of heat transferred to the formation is substantially constant along the drain.

Abstract: The method involves introducing a pumping and measuring set into a production well fitted with a pipe or liner perforated in a part extending through a producing zone. This set is fastened to the end of a flow string and comprises an activation pump and at least one set for measuring the produced effluents. The improvement essentially consists in using secondary pumping means such as a positive-displacement type pump, for example, in order to suppress the pressure drop undergone by the effluents during passage through the measuring zone, which distorts the measured values and causes parasitic flows by bypassing between the liner and the wall of well. The extent of these leak rates can be measured through a variation of the flow rate of the positive-displacement pump.

Abstract: A device comprising a flow string of two parts separated by an assembly for pumping effluents and a side-entry sub lowered into an equipped well provided with a pipe perforated in the part thereof going through a producing zone. At least one assembly of measuring instruments and possibly a device for homogenizing effluents before their treatment are arranged at a bottom end of the lower part of the string. The measuring assembly is connected with the surface installation by a multiconductor cable passing from an inside of the string to the outside at the level of the side-entry sub. The pumping assembly is positioned in a well zone accessible to the produced effluents but far enough from the most deflected and/or the narrowest well portions, in order to facilitate the setting of the pumping assembly and to avoid any risk of jamming or crushing of the cable connected with the assembly of the measuring instruments.

Abstract: A subterranean zone and a neighbouring zone are, respectively, for example, a petroliferous deposit and an underlying aquiferous nappe at a fluid pressure higher than that prevailing in the subterranean zone. A method of stimulating production of effluent from the subterranean zone involves drilling at least one deflected drain (preferably nearly or totally horizontal) through the petroliferous zone, the neighbouring zone and an intermediate layer which separates the petroliferous zone from the aquiferous nappe. The intermediate layer is, for example, slightly permeable because of the presence of heavy and viscous hydrocarbon products. The drain is equipped with a pipe fitted with openings at the subterranean zone and at the neighbouring zone and with packer devices selectively positioned in the pipe. A controlled opening of one packer device during production allows injection of water under pressure into the subterranean zone in order to promote production of effluent therefrom.

Abstract: A subterranean zone and a neighboring zone are, respectively, a petroliferous deposit and an underlying aquiferous nappe at a pressure higher than that prevailing in the subterranean zone, the two zones being separated by an intermediate substantially impervious or slightly permeable layer. A method of stimulating production of effluent from the subterranean zone includes drilling at least one deflected well, preferably nearly or totally horizontal in the intermediate layer and in connecting the two zones together through fractures of the intermediate layer made from the drain. The drain can be equipped with a pipe fitted with openings on a part of its length, with packers or like devices for effecting total or partial confining of the drain and with a fluid pressure source for causing fractures in the intermediate layer at the level of the confined portion.

Abstract: A well logging process and device for use in a non-flowing production well, wherein the well is activated to trigger production of effluents on both sides of a first measuring arrangement, with at least a part of the effluents coming from upstream of the flow, relative to the measuring arrangement and being handled by the measuring arrangement.

Abstract: A method of determining parameters of a geological environment having a known electrical resistivity R.sub.h, with a heterogeneity in the environment having an electrical resistivity R.sub.e, and with a borehole extending into either the environment or the heterogeneity at an unknown distance p from the interface between the environment and the heterogeneity. A measuring assembly is extended into the borehole, including an electrical emitter and two or more electrical detectors. Electrical energy is applied to the emitter and detected by one of the detectors at a distance d from the emitter, and the borehole resistivity R.sub.a at the distance d is determined. This is repeated for others of the detectors at other distances d. A curve is plotted of the resistivity ratio R.sub.a /R.sub.h as a function of the distance d. The plotted curve is compared with previously obtained curves of the resistivity ratio R.sub.a /R.sub.h as a function of d for various combinations of the values of the resistivity ratio R.sub.

Abstract: A device and method are provided for measuring the deformations of a sample, with the deformations resulting more particularly from the relaxation of the stresses to which the samples were subjected prior to the measurement, and with the sample having an axis corresponding to a main deformation direction. The device comprises at least five displacement sensors each having a measurement direction, with the measurement directions being substantially perpendicular to the axis of the sample.

Abstract: A device and method for measuring the deformations of a sample, which deformations particularly result from the relaxation of the stresses to which the samples was previously subjected. The device and method include the use of a cell inside which the sample is placed with the cell containing a thermal mass whose heat capacity and/or thermal conductibility are appreciably greater than those of air under normal temperature and pressure conditions.

Abstract: A process and device for hydraulically and selectively controlling, in two circulation directions, at least two tools or instruments connected to a casing located inside a well. A first hydraulic line is provided which includes branches to a first and a second of the two tools or instruments, with a distribution arrangement being adapted to modify a circulation of fluid in each of the branches and to enable an independent control, and with a hydraulic power generator being connected to the first hydraulic line.