MX2008004227A - A device for cleaning and doping equipment for threads - Google Patents

Abstract

A device for cleaning and doping (lubrication) equipment for threads (3b, 4b) of the type used to join pipes (4) to a pipe string (3) , especially in connection with petroleum production, where cleaning fluid and dope (lubricant) are sprayed at the threads (3b, 4b) at relatively high pressure from at least one nozzle (5, 6) mounted in the rotatable make-up section (1) of a power tong, and where at least one injection pump (7, 8) arranged to supply cleaning fluid or dope to the at least one nozzle (5, 6) is located in the rotatable make-up section (1) .

Description

DEVICE FOR CLEANING AND ADDING EQUIPMENT FOR THREADS Technical Field This invention relates to a cleaning equipment and addition of consistent grease (lubrication) for threads. More particularly, it relates to a consistent grease cleaning and addition equipment for threads of the type that is used to join pipes with a chain of pipes, in particular, in connection with the extraction of oil, and wherein the fluid of cleaning and the consistent greases are sprayed into the thread at a relatively high pressure, at least with a nozzle and an injection pump that is placed in a wrench for screwing pipes. When drilling threaded tubes are joined, usually, the threads are added with consistent grease (ie, they are lubricated). In addition to facilitating the coupling and uncoupling of the tubes, the purpose of the application of a consistent grease is the sealing of the threaded connection between the box (male) and the pin (female) when it is subjected to relatively high fluid pressures that occur during the drilling process. Advantageously, the corresponding threaded portions are cleaned, for example, by means of a cleaning fluid before the application of the consistent grease (lubricant). Advantageously, Any residual cleaning fluid is removed from the threaded portions after cleaning. Advantageously, the processes of cleaning and addition of consistent grease are carried out as the tube is threaded on the chain of tubes, and obviously, so that the cleaning fluid and the consistent grease are supplied by means of nozzles mounted on the tube. a close proximity to the chain of tubes, and in particular in or by means of clamping jaws of the so-called tap of screwing pipes. When the pipes are joined, a box portion (female), which is internally threaded into the upper end portion of the pipe chain, protrudes through the lower section of the pipe wrench, ie the so-called reaction section. The chain of tubes is kept fixed during the joining process. The lower portion of the tube that will be attached to the chain of tubes is lowered into the upper section of the pipe wrench, ie the so-called splice section and is fixed immediately above the upper portion of the chain of tubes with a male threaded pin that orients the box or female part of the tube chain. For joining, the tube is rotated by rotating the splice section. During this rotation, the fixed nozzles in close proximity and below the splicing section will provide a sufficient and continuous supply of cleaning fluid and consistent grease to the threads of the male pin of the tube. For the processes of cleaning and adding consistent grease (lubrication) of the female box threads of the fixed pipe chain, it is preferred to have a nozzle that moves around the central axis of the pipe chain, for example, by a set of nozzles that are placed on the rotating splice section. The obvious arrangement is to provide a consistent cleaning fluid and grease from the externally fixed reservoirs of the pipe wrench, by means of an oscillating device that is known per se, to the nozzles in the rotating splice section. The sealing means prevent the escape of fluid between the rotating and fixed oscillating components, which is a demanding task, in particular, in the case of the cleaning fluid that is transported at a high pressure.

SUMMARY OF THE INVENTION The objective of the invention is to remedy or reduce at least one of the drawbacks of the prior art. The goal is achieved according to the invention, through the features specified in the description below and in the following claims. The invention relates to a cleaning device and a consistent grease addition equipment (lubrication) for threads of the type used to join pipes with a pipe chain, in particular, in connection with the extraction of oil, wherein the cleaning fluid and the consistent grease are sprayed into the threads at a relatively high pressure, at least from a nozzle mounted at least in the rotating section of splice a tap of screwing pipes, at least one injection pump is positioned to supply cleaning fluid or grease consisting of at least one nozzle which is located in the rotating splice section. Preferably, a supply line to at least one injection pump is positioned to be connected for fluid communication with a reservoir of cleaning fluid or of consistent grease when the splice section of the pipe wrench assumes a position. inactive without load. Advantageously, the reservoirs of cleaning fluid and of consistent grease are pressurized. Preferably, the delivery device of at least one injection pump is in communication with fluid with the hydraulic pressure system that is integrated into the rotating splice section, and that has no connection to the non-rotating sections of the pipe wrench. Preferably, the fluid communication between the drive device of at least one injection pump and the hydraulic pressure system of the rotating splice section is sequential and controlled by the movement of the pipe wrench, through one or more actuators or a combination of these. Advantageously, the rotating connecting section of the pipe wrench is provided with at least one compressed air nozzle in fluid communication with the compressed air accumulator located in the rotating coupling section. Preferably, the fluid communication at least between a compressed air nozzle of the rotating connecting section of the pipe wrench and the compressed air accumulator is sequential and controlled by the cleaning fluid injection pump. Advantageously, a supply line to the compressed air accumulator is positioned to be connected for fluid communication with a source of compressed air when the connecting section of the pipe wrench assumes an inactive position without load.

Brief Description of the Figures The following describes a non-limiting example of a preferred embodiment illustrated in the accompanying figures, in which: Figure 1 is a partially sectioned side view of a nozzle and pump arrangement in a wrench of screwing pipes according to the invention; and Figure 2 is a schematic diagram showing a general arrangement according to the invention, schematically presenting nozzles, pumps, drive means and accumulators, reservoirs and fluid sources, as well as valves.

DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION In the figures, the reference number 1 denotes the rotating section of a pipe wrench twist fitting, while the reaction section of the pipe wrench is denoted by the reference number 2 A box-shaped upper end portion 3a of a chain of tubes 3 is fixed by the clamping jaws 2a of the reaction section 2 in a manner that is known per se. The box portion 3a has the female thread 3b. A lower end portion of pin shape 4a of a pipe 4 is fixed by the jaws of fastening that of the splice section 1, in a way that is known by itself. The pin portion 4a has the male threads 4b which correspond to the threads 3b of the box portion 3a. The rotating splice section 1 is provided with a first nozzle 5 for the distribution of a cleaning fluid, and which is connected to the supply side of a first injection pump 7 in a fluid communication mode. Similarly, a second nozzle 6 for the distribution of a consistent grease is connected to the supply side of a second injection pump 8 in a fluid communication mode. The nozzles 5, 6 are directed towards the female threads 3b of the upper portion of the non-rotating tube chain 3. The pressure sides of the driving means 7 ', 8 'for the injection pumps 7, 8 are connected for the fluid communication with a hydraulic system 13, by means of the pressure lines 7a and 8a, respectively. Suitable for this purpose would be a hydraulic system in which the hydraulic pressure is provided through the closing movement of the splice section in order to hold the pipe. The pressure lines 7a, 8a are passed through the directional valves 16 and 17, respectively, which could be driven by the vertical movement of the splice section 1 or by a combination of the vertical movements of the actuator 18 and the splice section 1 by contacting the annular actuator 18 located above and parallel to the splice section 1 with the directional valve 16, 17 and driving this one. The return sides of the drive means of the cleaning fluid and consistent grease pumps 7, 8 are connected for fluid communication with the pressure side of the drive means by means of the return lines 7b and 8b , respectively, the pressure lines 7a and 8a, respectively, and the directional valves 16 and 17, respectively, when the directional valves 16, 17 are not driven by the actuator 18 or the connecting section 1 or by a combination of the vertical movement of the actuator 18 and the splice section 1. The splice section 1 is also provided with a compressed air accumulator 20 connected in fluid communication with a compressed air nozzle through the air lines compressed 20a and a directional valve 24. The directional valve 24 is connected to the cleaning fluid pump 7 by means of an actuator 24a, so that when the driving means of the pump d and cleaning fluid 7 reaches a predetermined stage in the pump driving cycle, for example, when it reaches the limit of the linear displacement of the stroke of the pump, the directional valve 24 is opened to allow the air compressed pass of the accumulator 20 out of the compressed air nozzle 25. The volume of the accumulator 20 is sufficient to supply the compressed air nozzle 25 with a sufficient amount of compressed air to remove the residual cleaning fluid. The compressed air nozzle 25 is directed in the female threads 3b of the upper portion of the non-rotating pipe chain 3. When the connecting section 1 is fixed and open, the cleaning fluid pump 7, the grease pump consisting of 8 and the accumulator 20 are in fluid communication with a pressurized source 22 of cleaning fluid, a consistent grease reservoir 21 and a source of compressed air 23, respectively, by means of the lines 7c, 8c and 20c , respectively, and the quick-release couplings 11, 12 and 19, respectively, located in the interconnection 15 between the splicing section in motion and the surrounding static structure of the pipe wrench. Through this sequential fluid communication connection, the pumps 7, 8 and the accumulator 20 are filled with a quantity of cleaning fluid, of consistent grease and of compressed air, respectively. When the connecting section 1 of the pipe wrench is moved to hold a pipe 4, the connections between the pumps 7 and 8 and the accumulator 20, respectively, and the source of cleaning fluid 22, the Consistent grease reservoir 21 and compressed air source 23, respectively, are disconnected by the quick release couplings 11, 12 and 19 being activated in a manner that is known per se. The fixed reaction section 2 is provided with a cleaning fluid nozzle 9, a consistent grease nozzle 10 and a compressed air nozzle (not shown) in a permanent fluid communication with the pressurized source 22 of cleaning fluid, the consistent grease reservoir 21 and the compressed air source 23, respectively, through the control valves (not shown). The nozzles of the reaction section 2 are directed into the male threads 4b of the rotary tube 4. The cleaning fluid and the consistent grease are normally supplied to the nozzles 5, 6 at a pressure of the order of 50-60 mPa. The supply of the cleaning fluid, the compressed air and the consistent grease directed in the threaded portions 3b, 4b, is controlled sequentially with the following sequence: 1. The rotation of the splicing section 1 is stopped; 2. Splice section 1 is open, hydraulic system 13 increases the pressure and quick release couplings 11, 12 and 19 connect the splice section 1 with the consistent grease reservoir 21, the source of cleaning fluid 22 and the source of compressed air 23; 3. A tube 4 is clamped, rotated and lowered towards the upper portion of the tube chain 3; 4a. The injection pumps 7 and 8 are operated sequentially, through the remote control of the hydraulic system 13, to supply in sequence, the cleaning fluid, the compressed air and the fat consisting of the threaded portion 3b of the pipe chain not rotating 3 through nozzles 5, 25 and 6; 4b. Simultaneously, the cleaning fluid, the compressed air and the consistent grease are supplied sequentially in the threaded portion 4b of the rotating tube 4, through the respective fixed nozzles of the reaction section. 5. The tube 4 is connected to the chain of tubes 3 by continuous rotation of the connecting section 1 and the lowering of the tube 4 until a prescribed torque or torque has been achieved. The present invention eliminates the need to transfer fluid through one or more oscillating structures, in this way, the maintenance of the pipe wrench is simplified, increasing the reliability and improving the quality of the threaded connections in the pipe chain.

Claims (9)

1. CLAIMS 1. A cleaning device and a consistent grease addition equipment (lubrication) for threads (3b, 4b) of the type used to join pipes (4) with a pipe chain (3), especially in connection with the extraction of oil, wherein the cleaning fluid and the consistent grease (lubricant) is sprayed into the threads (3b, 4b) at a relatively high pressure at least from a nozzle (5, 6) mounted on a rotating splice section (1) of a pipe wrench, characterized in that at least one injection pump (7, 8) positioned to supply the cleaning fluid or the grease consisting of at least one nozzle (5, 6) are located in the rotating section of splice (1). The device according to claim 1, characterized in that the supply line (7c) towards a first one of at least one injection pump (7) is positioned to be connected for fluid communication with a fluid source of cleaning (22) when the splice section (1) of the pipe wrench assumes an inactive position without load. The device according to claim 1, characterized in that a supply line (8c) to a second at least one injection pump (8) is positioned to be connected for fluid communication with a consistent fat deposit. (21) when the splice section (1) of the pipe wrench assumes an inactive position with no load. The device according to claims 2 and 3, characterized in that the source of cleaning fluid (22) and the consistent fat deposit (21) are pressurized. The device according to claim 1, characterized in that the drive means of at least one injection pump (7, 8) is in fluid communication (7a, 16, 8a, 17) with a hydraulic pressure system (13) which is integrated in the rotating splice section (1) and which is not in fluid communication with the non-rotating structures of the pipe wrench. The device according to claim 5, characterized in that the fluid communication (7a, 16, 8a, 17) between the drive means and at least one injection pump (7, 8) and the hydraulic pressure system ( 13) of the rotary splice section is sequential and is controlled through the movement of the splice section (1) of one or more actuators (18) or a combination thereof. The device according to claim 1, characterized in that the rotary connecting section (1) of the pipe wrench is provided at least with a compressed air nozzle (25) which is in fluid communication (20a, 24) with a compressed air accumulator 20 provided in the rotary junction section (1). 8. The device according to claim 7, characterized in that the fluid communication (20, 24a) at least between a compressed air nozzle (25) of the rotary junction section (1) of the pipe wrench and the Compressed air accumulator is sequential and controlled through the cleaning fluid injection pump (7). The device according to claim 7, characterized in that a supply line (20c) towards the compressed air accumulator (20) is positioned to be connected for fluid communication with a source of compressed air (23) when the splice section (1) of the pipe wrench assumes an inactive position without load.