Abstract: A method for the identification of operational problems in wells that produce by gas-lift, including allowing the hydrodynamic evaluation of the well/lines set by injection of at least one alcohol in the gas-lift line, collecting samples at the well sampling point, and detecting alcohol passage and return by direct analysis of information about process variables provided by the well instrumentation.

Abstract: The present invention addresses to a method for the identification of operational problems based on the hydrodynamic characterization of the gas-lift and production well/lines set, by means of the injection of an alcohol, preferably ethanol, in the gas-lift line. The detection of the passage and the return of the alcohol is carried out by the direct analysis of information about the process variables (pressure and temperature at the bottom of the well, at the Christmas tree and at the surface, gas or liquid flowmeters, etc.). Preferably, this detection should also be confirmed by measuring the alcohol concentration at the return, either by sequential collection of samples of the liquid produced by the well and subsequent physicochemical analysis in the laboratory, or by an online meter specially installed for this purpose. A practical sample collection procedure has been developed for application together with this invention.

Abstract: This invention is related to a pneumatic lifting system for hydrocarbon production, comprising at least one mandrel (1) and at least one gas flow control valve (11), wherein the at least one mandrel (1) is connected to a production string (3), wherein the production string is positioned inside a well casing (2), wherein it comprises a straddle (10) supported on the production string and enveloping the mandrel, wherein in the region of the gas outlet (110) of the gas flow control valve (11) a chamber (105) is formed, wherein the straddle (10) comprises a means of fluidic communication (102) adapted to feed gas inside the straddle (10).

Abstract: The present invention relates to the design of a nozzle valve (GL) for gas lifting that can be used in place of conventional orifice valves (VO). The gas lift nozzle valve (GL) according to the present invention has a body (1) with admission orifices (2), and, immediately below these, a slight recess (3) in the internal diameter of the body where a convergent nozzle (4) is fitted to regulate the gas flow passing through the inside of the nozzle valve (GL) towards the outlet (5) of the latter.

Abstract: The present invention relates to the design of a nozzle valve (GL) for gas lifting that can be used in place of conventional orifice valves (VO). The gas lift nozzle valve (GL) according to the present invention has a body (1) with admission orifices (2), and, immediately below these, a slight recess (3) in the internal diameter of the body where a convergent nozzle (4) is fitted to regulate the gas flow passing through the inside of the nozzle valve (GL) towards the outlet (5) of the latter.

Abstract: The present invention relates to an apparatus and method for production from oil wells. More particularly, the present invention relates to an apparatus that utilizes at least one injection pumping device (9), positioned in the interior of a petroleum well (10) to provide hydraulic fluid to a hydraulic pumping device (3) positioned in the bottom of the petroleum well (10), in order to cause a flow of fluids originating from a reservoir (14).

Abstract: An apparatus uses at least one injection pump (9) positioned in proximity to an undersea petroleum well (10) to provide hydraulic fluid for hydraulic pumping equipment positioned in the bottom of the well, in order to cause a flow of produced oil. The injection pump (9) is able to suction hydraulic fluid from a tank of hydraulic fluid (8) positioned on the deck of a service unit (40). Alternatively, injection pump (9) is able to utilize water from the sea as a hydraulic fluid. Alternatively, the injection pump (9) may be integral with a Christmas tree manifold (6) or may be installed in an auxiliary well (90) in order that it's external portion does not enter into contact with seawater.

Abstract: The present invention relates to a mandrel for a gas lift valve which comprises an elongated body provided with means of connection at its ends. The body is provided with a side pocket (17) and a side receptacle (16) in the interior of which may be housed a gas lift valve (13) which injects gas into the interior of the body of the mandrel for the gas lift valve (15) by means of orifices (22) positioned in a nose (18). The mandrel for the gas lift valve (15) comprises additionally a lower body (23) provided on the lower part of the valve receptacle (16) of the mandrel of the side pocket (15) in that the lower body (23) is configured in a manner to seal the lower part of the valve receptacle (16) to form a chamber (24) and the lower body is provided with at least one injection orifice to inject gas into the interior of the body of the mandrel of the gas lift valve (15).

Abstract: Invention is of an improvement to seat of gate valves used for gas-lift producing oil wells, consisting of a seat lower part of which is curved there being a straight vertical art and a sloping straight lower part, central spacing consisting of a first part in the shape of a tapered nozzle at which gas is gradually speeded up, a second part which is the main restriction to flow, and a third part in the shape of a conical diffuser at which gas is gradually slowed down.

Abstract: The present invention discloses an apparatus that uses at least one injection pump (9) positioned in proximity to a subsea petroleum well (10) to provide hydraulic fluid for hydraulic pumping equipment positioned in the bottom of the well, in order to cause a flow of produced oil. The injection pump (9) is able to suck hydraulic fluid from a tank of hydraulic fluid (8) positioned on the deck of a service unit (40). Alternatively, injection pump (9) is able to utilize water from the sea as a hydraulic fluid. Alternatively, the injection pump (9) may be integral with a Christmas tree (6) or may be installed in an auxiliary well (90) in order that its external portion does not enter into contact with seawater.

Abstract: A method to set a hollow device into an undersea flow pipe uses a flexible pig driven by a flow flowing into said flow pipe to displace a hollow device to a point where a stop means halts a displacement of said hollow device, thereby setting said hollow device into position. A method to retrieve a hollow device into an undersea flow pipe uses a flexible pig driven by a flow flowing into said flow pipe to retrieve said hollow device from a location where said hollow device operates halted by a stopping means.

Abstract: There is disclosed a method and a device to allow a “rigid” pig to pass into an undersea flow pipe in which a hollow flow-constricting device is in use. According to the invention the device is provided with a first pipe branch and a second pipe branch. The first pipe branch is provided with a hollow flow-constricting device in it and both first and second pipe branches are provided with shut-off valves, whereby the flow can be diverted to the second pipe branch thereby enabling a rigid pig to pass into such second pipe branch, when necessary.

Abstract: A method to set a hollow device into an undersea flow pipe uses a flexible pig 5 driven by a flow flowing into the flow pipe to displace a hollow device to a point where a stop halts a displacement of hollow device, thereby setting hollow device into position. A method to retrieve a hollow device from an undersea flow pipe uses a flexible pig driven by a flow flowing into flow pipe to retrieve hollow device from a location where hollow device operates.

Abstract: The present invention relates to a gas lift valve for use in an oil well producing by means of gas lift, said gas lift valve making use of a central body venturi for both controlling the flow of the injection gas from the annulus between the tubing and the casing of the oil well, and precluding a reverse flow of fluids from said oil well towards said annulus to occur.

Abstract: The present invention relates to a method and a device to stabilize the production of oil wells. The device is used in a tubing of an oil well and it is intended to overcome the harmful effects provoked by the unstable flow of multiphase flows which are produced by some oil wells.

Abstract: A method to set a hollow device into an undersea flow pipe uses a flexible pig driven by a flow flowing into said flow pipe to displace a hollow device to a point where a stop means halts a displacement of said hollow device, thereby setting said hollow device into position. A method to retrieve a hollow device into an undersea flow pipe uses a flexible pig driven by a flow flowing into said flow pipe to retrieve said hollow device from a location where said hollow device operates halted by a stopping means.

Abstract: A method of diminishing the size of the cross section of an opening of a first hollow device located in an undersea flow pipe through which passes a fluid flow uses a second hollow device to be inserted into said undersea flow pipe, said second hollow device being provided with a leading portion and a trailing portion, said leading portion being of a smaller external diameter than said trailing portion, said second hollow device being provided with a passage extending longitudinally theretrough. Next a foam pig is inserted immediately after said second hollow device. Urged by said fluid flow, said foam pig displaces said second hollow device along said undersea flow pipe, until said second hollow device encounters said first hollow device. Said leading portion of said second hollow device is then inserted into an opening of said first device, thereby diminishing the size of a cross section of said opening.

Abstract: There is disclosed a method and a device to allow a “rigid” pig to pass into an undersea flow pipe in which a hollow flow-constricting device is in use. According to the invention the device is provided with a first pipe branch and a second pipe branch. The first pipe branch is provided with a hollow flow-constricting device in it and both first and second pipe branches are provided with shut-off valves, whereby the flow can be diverted to the second pipe branch thereby enabling a rigid pig to pass into such second pipe branch, when necessary.

Abstract: A method of diminishing the size of the cross section of an opening of a first hollow device located in an undersea flow pipe through which passes a fluid flow uses a second hollow device to be inserted into the undersea flow pipe, the second hollow device being provided with a leading portion and a trailing portion, the leading portion being of a smaller external diameter than the trailing portion, the second hollow device being provided with a passage extending longitudinally theretrough. Next a foam pig is inserted immediately after the second hollow device. Urged by the fluid flow, the foam pig displaces the second hollow device along said undersea flow pipe, until the second hollow device encounters the first hollow device. The leading portion of the second hollow device is then inserted into an opening of the first device, thereby diminishing the size of a cross section of the opening.

Abstract: A method to set a hollow device into an undersea flow pipe uses a flexible pig driven by a flow flowing into said flow pipe to displace a hollow device to a point where a stop means halts a displacement of said hollow device, thereby setting said hollow device into position. A method to retrieve a hollow device into an undersea flow pipe uses a flexible pig driven by a flow flowing into said flow pipe to retrieve said hollow device from a location where said hollow device operates halted by a stopping means.