MX2015004445A

MX2015004445A - Wireline pump.

Info

Publication number: MX2015004445A
Application number: MX2015004445A
Authority: MX
Inventors: Jørgen Hallundbæk; Ricardo Reves Vasques
Original assignee: Welltec As
Priority date: 2012-10-26
Filing date: 2013-10-25
Publication date: 2015-06-24
Also published as: CA2887541A1; AU2013336649B2; AU2013336649A1; EP2912261A1; BR112015008032A2; WO2014064254A1; CN104704196A; EP2725189A1; US20150308243A1; RU2015117243A

Abstract

The present invention relates to a wireline pumping assembly (1) for being introduced in a wellbore (60) or a casing (61) and submerged in well fluid. The wireline pumping assembly extends in a longitudinal direction (50) and is adapted for connection with a wireline. Furthermore, the wireline pumping assembly comprises a pump section (2) comprising a tubular pump housing (20) providing a pump chamber (210); one or more inlets (21) provided in a lower part of the tubular pump housing; a first valve (22) for opening and closing the inlet; a plunger (23) being slidingly disposed in the pump chamber, the plunger comprising a second valven (242) controlling a flow of fluid from a first compartment (202) of the pump chamber below the plunger to an second compartment (203) of the pump chamber above the plunger; a pump rod (26) operably connected to the plunger and extending from the plunger through the tubular pump housing; and one or more outlets (27) provided in an upper part of the tubular pump housing. The wireline pumping assembly further comprises a linear actuator (40) arranged in association with the tubular pump housing for driving the pump rod, whereby, when the wireline pumping assembly is at least partially submerged into the well fluid, well fluid is drawn into the tubular pump housing through the one or more inlets, forced through the second valve of the plunger, and expelled through the one or more outlets in the upper part of the tubular pump housing, wherein the linear actuator comprises a tubular stroker cylinder (4) comprising one or more piston housings (47), one or more piston elements (46) slidingly disposed in the piston housing to divide the piston housing into a first chamber (41) and a second chamber (42), a stroker shaft (45) operably connected to the piston element and for connection with the pump rod to provide reciprocation of the plunger, a pump (5) for alternately supplying hydraulic fluid under pressure to the first chamber and the second chamber of the tubular stroker cylinder to reciprocate the piston element in the tubular stroker cylinder, and an electrical motor (6) for driving the pump. Furthermore, the invention relates to a use of the wireline pumping assembly, a method of initiating a well using a wireline pumping assembly and a method of optimising an initiation operation.

Description

BOMB? OF STEEL LINE FIELD OF THE INVENTION The present invention relates to a steel line pumping assembly for entering a well bore or tubing and immersing in well fluid. Additionally, the invention relates to a use of the steel line pumping assembly, a method for starting a well using a steel line pumping assembly and a method of optimizing an initiation operation.

TECHNICAL BACKGROUND During oil and gas production, it is sometimes necessary to help production in a well due to high hydrostatic pressure. In situations where the well is not able to generate enough pressure to push the hydrocarbons to the surface, or where a well has been deliberately or unintentionally "killed", for example, by the presence of water in the well, it can use a tool to raise the well fluid to the top of the well. These tools are often 52-1104-15 they call lifting tools Artificial lifting tools can be deployed in a well for longer or shorter periods of time depending on the specific conditions of the well. Mechanical pumps are used to extract oil from underground formations. However, such pumps involve a large construction on the surface as well as pumping rods that descend through the entire well to a subsurface mechanical pump provided in the well. These types of pumps may be suitable for use in wells that require continuous pumping for longer periods of time. However, for operations that require pumping action only for a limited period of time, the mechanical pump concept is inconvenient due to the considerable associated investments. In addition, in maritime oil fields frequently located at great depths, the concept of a pumping rod extending from a force generating facility on the surface to a pumping device at the bottom of the bore is inappropriate.

Because water has a higher density than hydrocarbons, the presence of 52-1104-15 Water in a well can increase hydrostatic pressure, thus preventing the pressure in the well from boosting the hydrocarbons to the surface. In situations where the inflow of water has deliberately or unintentionally killed a well, the pumping action at the bottom of the borehole may require starting or restarting the well by removing the water. Known systems for removing water, such as gas lift from coiled tubing, require many equipment, such as spools of coils and gas tanks. Additionally, pumps used in well-initiated well initiation systems often require high amounts of energy which can not be supplied through standard steel line cables. Therefore special cables are required that require additional surface equipment, which makes such operations more complicated and expensive. Therefore there is a need for a well initiation system which can be deployed using a single conductor or multiple conductor steel line requiring a minimum of surface equipment, planning and logistics. 52-1104-15 SUMMARY OF THE INVENTION An object of the present invention is to overcome completely or partially said disadvantages and drawbacks of the previous technique. More specifically, one object is to provide an improved well initiation system and an associated method for starting wells. Additionally, one object is to provide a simple and reliable steel line pumping device which can be used to initiate wells that have been killed intentionally or unintentionally.

The above objects, along with several other objects, advantages and features, which will be apparent from the following description, are achieved by a solution in accordance with the present invention by means of a pumping assembly of steel line to be introduced into a well bore or a tubing and submerged in well fluid, the steel line assembly extending in a longitudinal direction and being adapted to connect with a steel line, and the steel line pumping assembly comprises a pumping section comprising: a tubular pump housing that provides a pump chamber, 52-1104-15 - one or more entries provided in a lower part of the tubular pump housing, - a first valve to open and close the entrance, a plunger that is slidably disposed in the pump chamber, the plunger comprises a second valve that controls a flow of fluid from a first compartment of the pump chamber on one side of the plunger to a second compartment of the pump chamber of the pump chamber. another side of the plunger, a pump rod operatively connected to the plunger and extending from the plunger through the tubular pump housing, and - one or more entries provided in a lower part of the tubular pump housing, wherein the steel line pumping assembly additionally comprises: - a linear actuator arranged in a manner associated with the tubular pump housing for driving the pump rod, when the steel line pumping assembly is at least partially submerged in the well fluid, the well fluid is taken into the interior of the tubular pump housing through one or more of the inputs, is 52-1104-15 displaced through the second valve of the plunger, and expelled through one or more of the outlets in the upper part of the tubular pump housing.

In this way, a simple and reliable pumping device is provided which is capable of traveling using a standard steel line and capable of pumping fluids at the bottom of the borehole. Additionally, since the pumping device is movable using a standard steel line, the amount of equipment needed to deploy the device is substantially reduced as compared to known techniques for performing pumping operations at the bottom of the bore.

In one embodiment, the first valve may be a stationary valve fixed in relation to the tubular pump housing and the second valve may be a displaceable valve movable with the plunger in relation to the tubular pump housing.

In another embodiment, the linear actuator may comprise: a tubular piston cylinder that provides one or more piston housings, - one or more piston elements arranged 52-1104-15 slidably in the piston housing for dividing the piston housing in a first chamber and a second chamber, a piston shaft operably connected to the piston member to be connected to the pump rod to provide reciprocating movement of the piston, - a pump for alternately supplying hydraulic fluid under pressure to the first chamber and the second tubular piston chamber chamber for reciprocatingly moving the piston member in the tubular piston cylinder, and an electric motor to drive the pump.

Additionally, the linear actuator may comprise a plurality of piston members slidably disposed in a plurality of piston housings and operatively connected to the piston shaft.

In addition, the linear actuator may comprise an electric linear motor and a piston shaft driven by the electric linear motor to connect to the pump rod to provide reciprocating movement of the plunger.

In one embodiment, the pumping assembly of 52-1104-15 Steel line can be adapted to the pump at a flow rate of approximately 5-15 liters per minute, preferably.

In another embodiment, the steel line pumping assembly may further comprise a plug device for providing a seal in an annular section between the steel line pumping assembly and the tubing, the plug device comprising a connected base part. with the tubular pump housing and has a through hole, and one or more seal elements disposed around the base portion, which may extend from the base portion to seal the annular section.

Also, the base part may be the tubular pump housing.

Additionally, the base part may be part of the tubular piston cylinder and the outlet (s) of the pump section may be disposed in the linear actuator.

In this way, a simple and reliable pumping device is provided which is capable of traveling using a standard steel line and capable of starting a well by pumping fluids from one side of the device. 52-1104-15 stopper to the other side, with which water can be removed. Additionally, since the pumping device is displaceable using a standard steel line, the amount of equipment needed to deploy the device is substantially reduced as compared to known techniques for starting wells. The lower need for equipment greatly reduces the complexity of the initiation operation, thereby reducing the time and cost of such operations.

In yet another embodiment, the plug device may further comprise an anchoring mechanism for securing the steel line pumping assembly in the well, the anchoring mechanism is slidably disposed about the base part and comprises a plurality of positioning jaws extending from the base portion in a substantially radial direction to engage with the pipe or tubing.

Additionally, the plug device may further comprise a compression sleeve slidably disposed about the base portion to compress one or more of the seal elements, and the seal elements may be adapted to extend from the base portion. 52-1104-15 for sealing the annular section when the compression sleeve is displaced in the longitudinal direction towards one or more of the seal elements, thus applying a compressive force to one or more of the seal elements.

In addition, the compression sleeve may comprise a conical section oriented towards the anchoring mechanism, the conical section being adapted to push the positioning jaws in a radial direction, at least during the activation of the anchoring mechanism, when the plurality of jaws of placement are displaced towards the compression sleeve thus engaging the conical section.

In addition, the compression sleeve may be adapted to move through the displacement of the anchoring mechanism, resulting in a subsequent compression of the seal elements by the compression sleeve.

In one embodiment, the steel line pumping assembly may further comprise an equalizing valve for equalizing a differential pressure through the plug, at least prior to disengaging the plug, when the plug device is placed in a well. 52-1104-15 Additionally, the plug device may comprise the equalizing valve.

In addition, the steel line pumping assembly may additionally comprise one or more sensors for measuring a differential pressure through the plug device when the plug device is placed in a well.

Additionally, the steel line pumping assembly can further comprise an anchor section for anchoring the steel line pumping assembly in the well, the anchoring section comprises a plurality of hydraulically activatable anchoring elements extendable from the body of the tool, to engage with the tubing.

Also the steel line pumping assembly may further comprise a drive unit for advancing the steel line pumping assembly in diverted wells.

In one embodiment, the steel line pumping system may comprise a steel line pumping assembly as described above, and a plug device for providing a seal in an annular section between the plug device and the tubing, the plug device comprises a base part having an adapted through hole 52-1104-15 to connect with the tubular pump housing of the pump section, and one or more seal elements arranged around the base portion, which may extend from the base portion to seal the annular section, wherein the pump assembly Steel line is adapted to be connected with the plug device of the bottom of the bore after the placement of the plug device in the well.

The present invention further relates to a use of the pump assembly slickline as described above or the pumping system slickline described above for initiating a well killed by removing water or mud present in the pit using the pumping action provided by the pumping assembly.

In addition, the present invention relates to a method of initiating a well using a steel line pumping assembly as described above, comprising the steps of: - insert the steel line pumping assembly into the borehole, placing the plug device to provide a seal in an annular section between the plug device and the tubing, the device 52-1104-15 Stopper comprises: a base part having a through hole adapted to be connected to the tubular pump housing of the pump section, and - one or more seal elements arranged around the base part extendable from the base part to seal the annular section, - operating the pump section of the steel line pumping assembly to pump fluid through the plug device until a pressure under the plug device is sufficient to cause the well to operate on its own. equalize the pressure on the plug to operate the equalizing valve, and - Remove the pumping assembly of the steel line from the well.

The method may further comprise the step of removing the plug device from the well.

Finally, the present invention relates to a method for optimizing an initiation operation, comprising the steps of: - determine a level of pressure in the well under the plug device, sufficient to make the well operate on its own, - continuously monitor the pressure in the 52-1104-15 well below the stopper device while the pumping section is operated to pump fluid from beneath the stopper device to the top of the stopper device, and - determining when the predetermined pressure level is reached, after which the operation of the pump section can be stopped.

BRIEF DESCRIPTION OF THE DRAWINGS The invention and its many advantages will be described in more detail below with reference to the attached schematic drawings, which for the purpose of illustration show some non-limiting modalities, and in which: Figure 1 shows a steel line pumping assembly, Figure 2 shows a cross section of a pump section mode of the steel line pumping assembly, Figure 3a shows a cross section of a plug device embodiment of the steel line pumping assembly, Figure 3b shows a cross section of another embodiment of a plug device, 52-1104-15 1a Figure 4a shows a cross section of a mode of a linear actuator 1a Figure 4b shows a cross section of another embodiment of a linear actuator Figure 5a shows the steel line pumping assembly of Figure 1 in a condition placed inside a tubing at the bottom of the borehole, Figure 5b shows an amplification of a lower section of the steel line pumping assembly shown in Figure 5a, Figure 6 shows another embodiment of the steel line pumping assembly comprising a driving unit and an anchoring section, Figure 7 shows another embodiment of the steel line pumping assembly, and Figure 8 shows yet another embodiment of the steel line pumping assembly.

All figures are quite schematic and are not necessarily to scale, and show only those parts that are necessary in order to explain the invention, omitting other parts or simply suggesting. 52-1104-15 DETAILED DESCRIPTION OF THE INVENTION Figure 1 shows a steel line pumping assembly 1 comprising a pump section 2, a plug device 3, a linear actuator 40 and an electronic section 7. The steel line pumping assembly is a bottom assembly of the perforation adapted to be suspended in a well using a steel line 60 operatively connected to an upper end of the steel line pumping assembly. At the lower end of the steel line pumping assembly, the plug device is disposed next to the pump section. The plug device may be an integrated part of the steel line pumping assembly or be adapted to be releasably connected to the steel line pumping assembly at the bottom of the bore.

The pumping section 2 is operatively connected to the linear actuator 40, and the linear actuator provides the energy input required to drive the pump section 2. The steel line pumping assembly is energized through the steel line 60, and the electronic section controls the energization and the operation 52-1104-15 from the rest of the steel line pumping assembly.

Figure 2 shows a pump section 2 of the steel line pumping assembly, comprising a tubular pump housing 20 which also constitutes a tool housing. The pump housing 20 defines a pump chamber 201. A lower portion of the pump housing is provided with inlets 21 in fluid communication with the pump chamber 201, and an upper portion of the pump housing is provided with a plurality of outlets 27 in fluid communication with the pump chamber. Additionally, in a lower portion of the pump housing, a first valve 22, such as a stationary valve is arranged to control the flow of fluid through the inlet 21. In the pump chamber 201, a plunger is slidably disposed. 23, thus dividing the pump chamber into a first compartment 202 and a second compartment 203. To control the flow of fluid from the first compartment 202, through the plunger 23 to the second compartment 203, the plunger is provided with a second valve 24, such as a mobile valve. The pump section 2 additionally comprises a pump rod 26 connected 52-1104-15 operatively to the plunger and extending from the plunger through the tubular pump housing to connect with a piston shaft 45 (shown in Figure 4a) of the linear actuator.

The steel line pumping assembly additionally comprises a linear actuator 40 arranged in association with the pump housing 20, as shown in Figure 1. As shown in Figure 4a, the linear actuator 40 comprises a tubular piston cylinder. 4 defining a piston housing 47 and a piston member 46 slidably disposed in the piston housing for dividing the piston housing into a first chamber 41 and a second chamber 42. A piston shaft 45 extending from the piston housing. The piston element is operably connected to the pump rod of the pump section, as described above, to provide reciprocating movement of the plunger in the pump chamber. The linear actuator further comprises a pump 5 (not shown in Figure 4a) for alternately supplying hydraulic fluid under pressure to the first chamber 41 and the second chamber 42 of the tubular piston cylinder, and an electric motor 6 (shown in Figure 1). ) is provided for 52-1104-15 push the bomb. When the fluid is supplied alternately to the first chamber 41 and a second chamber 42, the piston member reciprocates in the tubular piston cylinder, thereby creating a linear movement. The linear movement is transferred through the piston shaft 45 to the pump rod 26 (shown in Figure 1), thereby reciprocating the plunger in the pump chamber. When the plunger moves alternately, a pumping effect is created in the pump section and, as long as the steel line pumping assembly is immersed in a well fluid, the well fluid is taken into the interior of the well housing. pump through one or more of the inlets in the lower part of the tubular pump housing, is displaced through the second valve of the plunger, and expelled through the plurality of the outlets in the upper part of the tubular pump housing . In another embodiment (not shown), the pump housing 20 can be provided as a separate pump housing within the tubular tool housing.

More specifically, during an upward stroke movement, the plunger moves away from the inlet 21 and the first valve 22, which causes 52-1104-15 the well fluid is sucked through the inlet 21, through the first open valve 22 and into the interior of the first compartment 202 of the pump chamber. The first valve is a check valve that allows fluid to flow into the pump chamber. Therefore, when the plunger 23 reaches the position of the upper end, the first compartment of the pump chamber has been flooded. A next downward stroke movement of the plunger, in which the plunger moves towards the inlet 21 and the first valve 22, moves the fluid through the movable valve 24 of the plunger and into the second compartment 203 of the pump chamber. During the next upward stroke movement, the fluid in the second compartment 203 is ejected out through the plurality of outlets in the pump housing while the second valve prevents fluid from flowing in the direction of the first compartment 202. In the embodiment shown , the first valve and the second valve are formed as ball-type check valves and comprise a displaceable valve ball 221, 241 cooperating with a valve seat 222, 243 to control the flow direction. Nevertheless, 52-1104-15 the skilled person would know that other types of valves that provide similar functionality can be contemplated. Additionally, the design of the pump section is based on the widely used rod pump principles, and therefore the skilled person can contemplate other designs of the pump section without departing from the invention.

Details about the design of the linear actuator are shown in Figures 4a and 4b showing different embodiments of a linear actuator. In both embodiments, the piston shaft 45 extends through the tubular piston cylinder 4 sectioned in one or more piston housings 47 by means of divisions 48. The divisions comprise a sealing means 49b, such as an O-ring, with the object of providing a sealing connection between the divisions and the piston shaft 45. In each of the piston housings 47, a piston member 46 is provided around the piston shaft 45 in such a way that the piston shaft 45 can move back and forth within the tubular piston cylinder 4 to provide linear movement. Each of the piston elements 46 divides each one of one or more of the piston housings into 52-1104-15 a first chamber 41 and a second chamber 42, and the piston elements are provided with sealing means 49a in order to provide a sealing connection between the interior of the piston housing 47 and the exterior of the piston member 46. As shown in Figure 4a, the fluid is supplied alternately to the first chamber 41 and the second chamber 42 through the respective fluid channels 43, 44. In the embodiment shown in Figure 4b, only the fluid channels are shown in fluid communication with the first Piston housing, however, the other piston housings are provided with a similar arrangement of fluid channels. To provide linear movement of the linear actuator, the pump pumps fluid into the first chamber by sucking a corresponding amount of fluid from the second chamber 42 and vice versa. When the first chamber 41 is substantially full, the pump changes its pumping direction and pumps fluid from the first chamber 41 into the second chamber 42. Consequently, the piston member 46 is displaced in the opposite direction. Consequently, the piston shaft 45 is displaced 52-1104-15 backwards and forwards, thereby providing linear movement. As can be seen in Figure 4a, the first chamber 41 is provided with a fluid channel 43 at one end of the piston housing 47, and the second chamber 42 is provided with a fluid channel 44 at the opposite end of the piston housing 47. In this way, the fluid can be sucked or pumped into each chamber until the piston member 46 almost touches the divisions 48. Therefore the linear actuator is a closed system, which means that the same fluid is recirculated to be pumped back and forth in the piston housing 47 in order to move one or more piston elements 46 back and forth.

In another embodiment, the linear actuator may comprise an electric linear motor 51 that drives the cylinder shaft 45.

Figure 3a shows a plug device 3 adapted to be arranged next to the pump section, as shown in Figure 1, in such a way that the entrance of the assembly 35 disposed at the end of the plug device is in fluid communication with the entrance of the pump section 2 through the exit 36. The 52-1104-15 plug device is adapted to anchor the steel line pumping assembly in the well and to provide a circumferential seal in an annular section 62 between the steel line pumping assembly and the tubing 61 (shown in Figure 5a) or an inner wall of the well. The plug device comprises a base portion 31 having a through hole 32 extending in a longitudinal direction and a plurality of seal elements 34 arranged around the base portion to seal the annular section. Above the seal elements 34, a compression sleeve 38 and an anchoring mechanism 33 are slidably disposed around the base part. The anchoring mechanism comprises a plurality of positioning jaws 331 which are adapted to extend from the base portion in a substantially radial direction. When the plug device is coupled to the pump section, the bore 32 of the plug device is in fluid communication with the inlet of the pump section. The well fluid can therefore be sucked into the pump chamber through the bore 32.

To place or activate the device 52-1104-15 As a stopper, a force is applied to the anchoring mechanism 33 in the longitudinal direction, thus displacing the anchoring mechanism towards the seal elements. As the anchoring mechanism moves, the positioning jaws 331 engage a conical section 381 of the compression sleeve facing the anchoring mechanism. The conical shape of the compression sleeve displaces the positioning sleeves in a radially outward direction to engage with the tubing when the steel line pumping assembly is placed at the bottom of the perforation. When the compression sleeve is also slidably disposed about the base part 31, the displacement of the anchoring mechanism 33 moves the compression sleeve in the same direction towards the seal elements. The seal elements 34 are adapted to extend from the base portion 31 to seal the annular section when the compression sleeve is displaced. The displacement of the compression sleeve applies a compressive force to the seal elements 34, whereby the seal elements are compressed in the longitudinal direction, causing the seal elements to ripple to ffuyeerraa. The cooperative relationship of the 52-1104-15 The anchoring mechanism, the compression sleeve 38 and the seal elements 34 therefore make the positioning jaws 331 and the seal elements 34 extend simultaneously from the base part 31 to position the plug device.

In one embodiment, the steel line pumping assembly may further comprise an equalizing valve 37, as shown in Figure 3b. The equalizing valve is adapted to control the flow through the bore 32 of the plug device 3. The equalizing valve can also be used to equalize a differential pressure created through the plug device when the plug device is placed in the well and the well fluid is pumped from the lower sealed section 66a of the well under the plug to the upper section 66b of the well above the seal elements, as shown in Figures 5a and 5b. As shown in Figure 3b, the equalizing valve is provided in the bore 32 of the plug. However, if the plug device is an integrated part of the steel line pumping assembly, the equalizing valve may also be incorporated in the pump section (not shown). To monitor and measure the differential pressure through the 52-1104-15 plug device, plug device or other parts of the steel line pumping assembly may comprise a system for measuring differential pressure, such as one or more sensors 39 for measuring the pressure in the lower and upper sections of the well. However, the differential pressure can also be determined based on other principles known to the skilled person, among others based on the force required to drive the plunger in the pump section.

Further, when the differential is negative, that is, when the pressure in the lower sealed section 66a of the well under the seal element is higher than the pressure in the upper section 66b of the well, the well can start to flow by itself while well fluid flows from regions with higher pressure to regions with lower pressure. In the pump section mode shown in Figure 2, the design of the first valve 22 and the second valve 24 allows the well fluid to flow from the inlet 21 to the outlets 27 regardless of the position of the plunger 23. This way, the steel line pumping assembly operates in contribution increasing the existing flow in the well. 52-1104-15 Based on the flow through the plug device 3 and / or the flow through the pump section 2, the differential pressure can also be measured by a single sensor disposed through the plug device or by a single sensor in the Plunger driving measurements over time. An alternative method for determining the differential pressure is to measure the flow through the outlets 27 of the pump section, for example, by providing a flow meter 28 at one or more of the outlets 27.

In Figure 6, the steel line pumping assembly is provided with a driving unit 9 and an anchoring section 8. The driving section is adapted to drive the steel line pumping assembly into inclined sections of the well, and the anchoring section can be used to fix the steel line pumping assembly of the bottom of the hole.

In Figure 7, the steel line pumping assembly 1 comprises the plug device 3 having the through hole 32 in which the piston shaft 45 extends and the piston shaft is connected to the pump rod 26 of the pump section 2. The pump section is connected, equal 52-1104-15 as explained above, operatively with the linear actuator 40. The outlets 27 are disposed in the linear actuator 40 above the plug device and closer to the plug device than the outlet 21 of the pump section 2. Therefore, , the base part of the plug device forms part of the linear actuator.

In Figure 8, the plug device 3 is arranged in such a manner that the base part is the tubular pump housing and the seal member 34 is disposed around the pump housing and is radially expandable from the pump housing. The seal member is an infiable elastomeric material which is inflated by the linear actuator before the actuator drives the pump section. As can be seen, the outlets 27 are disposed in the upper part of the pump housing and the entrance in the bottom of the housing.

The steel line pumping assembly can be used for various purposes that require pumping at the bottom of the bore. In particular, the steel line pumping assembly can be used to start a well that has been intentionally killed, for example, to perform 52-1104-15 maintenance operations or similar in the bottom of the drilling. To kill a well, water can be introduced into the well, thus increasing the hydrostatic pressure by preventing the hydrocarbons from being displaced to the surface by the pressure exerted by the formation of the surroundings. This well can be started by removing water from the well. For this, the steel line pumping assembly according to the present invention is introduced into a well through the lubricator (not shown) on the surface of the well.

Figures 5a and 5b show the steel line pumping assembly being immersed in a well 65 by means of a steel line 60. When the steel line pumping assembly 1 has reached the specified position, the plug device is active, whereby the positioning jaws 331 engage the tubing 61 to secure the steel line pumping assembly, and the seal elements 34 extend simultaneously to provide a circumferential seal that seals the annular section. When the steel line pumping assembly has been placed, the well is therefore divided into a lower sealed section 66a of the well under the placed seal elements and an upper section 52-1104-15 66b of the well above the seal elements placed.

Next, the pump section 2 is activated to pump fluid from the well below the seal elements 34 to the upper section 66b of the well. When pumping fluid from the well from the lower sealed section 66a to the upper section of the well, there is an elevation of the well fluid in the upper section towards the surface and an accumulation of pressure in the lower section of the well. The pressure in the upper and / or lower section is monitored continuously to determine when enough water has been removed for the well to be able to operate on its own. When the desired pressure in the lower sealed section 66a has been reached, the operation of the pump section can be stopped.

Before the steel line pumping assembly can be removed, the pressure through the plug device has to be equalized, which can be done by operating the equalizing valve provided in the plug device or in another part of the line pumping assembly. steel. When the pressure has been equalized, the steel line pumping assembly is pulled towards the lubricator and 52-1104-15 immediately it is removed from the well. In addition, the steel line pumping assembly can be easily moved to the next well to perform a similar initiation operation.

In another embodiment, the plug device 3 and the remainder of the steel line pumping assembly 1 can be operated separately and adapted to be releasably connected to the bottom of the bore. In that case, the first plug device is inserted into the well and placed in the desired position by activating the anchoring mechanism and the seal elements. Next, the steel line pumping assembly is introduced into the well and connected to the plug device. When the desired pressure in the lower sealed section 66a has been reached by the operation of the pump section, the steel line pumping assembly can be removed from the well. The pressure can then be equalized using the equalizing valve provided in the plug device, and the plug device can be removed.

Additionally, the design of the plug device 3 and the remainder of the steel line pumping assembly 1 as separate and removably attachable units may allow the device 52-1104-15 of plug 3 is disposed at the bottom of the well permanently or for long periods of time.

Additionally, as described above, the design of the pump section allows the well fluid to flow from the inlet 21 to the outlets 27 regardless of the position of the plunger 23. The steel line pumping assembly can therefore be arranged in the bottom of the well permanently or for longer periods of time, operating based on actual demand to increase the flow in the well. If, for some reason, the flow in the well drops suddenly, the steel line pumping assembly can be activated to increase the flow until once again the well is able to operate on its own. The steel line pumping assembly can be activated either automatically based on a pressure measured in the well or by means of a signal received from an operator. The differential pressure measured through the placed seal elements can therefore be used to control the operation of the pumping action of the steel line pumping assembly by continuously activating and deactivating the pumping action to increase the flow in the well. 52-1104-15 Fluid or well fluid is understood to be any type of fluid that may be present in oil or gas wells in the bottom of the well, such as natural gas, oil, oil sludge, crude oil, water, etc. Gas is understood to be any type of gas composition present in a well, a termination, or an open hole, and by petroleum it is understood that it is any type of petroleum composition, such as crude oil, a fluid containing oil, etc. Therefore, the gas, oil, and water fluids may comprise other elements or substances than gas, oil, and / or water, respectively.

By tubing it is understood that it is any type of pipe, pipe, tubular, lining, column, etc., used in the bottom of the borehole in relation to the production of oil or natural gas.

In the event that the assembly is not fully submerged within the casing, a tractor at the bottom of the borehole may be used to push the assembly fully into position in the well. The tractor at the bottom of the hole may have projectile arms that have wheels, where the wheels are in contact 52-1104-15 with the internal surface of the casing to propel the tractor forward and the assembly in the casing. A drilling bottom tractor is any type of drive tool capable of pushing or pulling tools at the bottom of a well bore, such as a Well Tractor®.

Also, the linear actuator can be a Well Stroker®. Although the invention has been described above in connection with preferred embodiments of the invention, it will be apparent to a person skilled in the art that various modifications are conceivable without departing from the invention as defined by the following claims. 52-1104-15

Claims

1. A steel line pumping assembly (1) to be inserted into a well bore (60) or a borehole (61) and immersed in well fluid, the steel line pumping assembly extends in a longitudinal direction ( 50) and is adapted to be connected with a steel line (60), and the steel line pumping assembly comprises a pumping section (2) comprising: - a tubular pump housing (20) that provides a pump chamber (210), - one or more inlets (21) provided in a lower part of the tubular pump housing, a first valve (22) for opening and closing the inlet, a plunger (23) slidably disposed in the pump chamber, the plunger comprises a second valve (242) which controls a flow of fluid from a first compartment (202) of the pump chamber on one side of the plunger to a second compartment (203) of the pump chamber on the other side of the plunger, a pump rod (26) operatively connected to the plunger and extending from the plunger through the tubular pump housing, and 52-1104-15 - one or more inlets (27) provided in a lower part of the tubular pump housing, wherein the steel line pumping assembly additionally comprises: a linear actuator (40) disposed in a manner associated with the tubular pump housing for driving the pump rod, whereby, when the steel line pump assembly is at least partially submerged in the well fluid, the fluid from the well is carried into the tubular pump housing through one or more of the inlets, is moved through the second valve of the plunger, and expelled through one or more of the outlets in the upper part of the housing tubular pump, where the linear actuator comprises: a tubular piston cylinder (4) which provides one or more piston housings (47), one or more piston elements (46) slidably disposed in the piston housing for dividing the piston housing in a first chamber (41) ) and a second chamber (42), - a piston shaft (45) operably connected to the piston element and to connect with the pump rod to provide a movement 52-1104-15 alternative of the plunger, a pump (5) for alternately supplying hydraulic fluid under pressure to the first chamber and the second tubular piston chamber chamber for reciprocatingly moving the piston element in the tubular piston cylinder, and - an electric motor (6) to drive the pump.

2. A steel line pumping assembly (1) according to claim 1, wherein the linear actuator comprises a plurality of piston elements (46) slidably disposed in a plurality of piston housings 47 and operatively connected to the shaft of piston.

3. A steel line pumping assembly (1) according to claim 1 or 2, wherein additionally comprises a plug device (3) for providing a seal in an annular section (62) between the steel line pumping assembly and the tubing, the plug device comprises: - a base part (31) connected to the tubular pump housing and has a through hole (32), and 52-1104-15 one or more seal elements (34) disposed around the base portion extendable from the base portion to seal the annular section.

4. A steel line pumping assembly (1) according to claim 3, wherein the base part is the tubular pump housing.

5. A steel line pumping assembly (1) according to claim 3, wherein the base part is part of the tubular piston cylinder and the outlet (s) (27) of the pump section are disposed in the linear actuator.

6. A steel line pumping assembly (1) according to any of the claims 3-5, wherein the plug device further comprises an anchoring mechanism (33) for fixing the pumping assembly of steel line in the well, the The anchoring mechanism is slidably disposed about the base portion and comprises a plurality of positioning jaws (331) extending from the base portion in a substantially radial direction to engage with the tubing.

7. A steel line pumping assembly (1) according to any of claims 3-6, in 52-1104-15 wherein the plug device further comprises a compression sleeve (38) slidably disposed about the base portion for compressing one or more of the seal elements, and wherein the seal elements are adapted to extend from the sealing portion. base for sealing the annular section when the compression sleeve is displaced in the longitudinal direction towards one or more of the seal elements, thus applying a compression force to one or more of the seal elements.

8. A steel line pumping assembly (1) according to claim 7, wherein the compression sleeve comprises a conical section (381) facing the anchoring mechanism, the conical section is adapted to push the positioning jaws in a direction radial, at least during the activation of the anchoring mechanism, when the plurality of positioning jaws are displaced towards the compression sleeve thus hooking the conical section.

9. A steel line pumping assembly (1) according to any of claims 3-8, wherein additionally comprises an equalizing valve (37) to equalize a differential pressure 52-1104-15 through the plug, at least before disengaging the plug, when the plug device is placed in a well.

10. A steel line pumping assembly (1) according to any of claims 3-9, wherein additionally comprises one or more sensors (39) for measuring a differential pressure through the stopper device when the stopper device is placed in a well.

11. A steel line pumping assembly (1) according to any of the preceding claims, wherein additionally comprises an anchor section (8) for anchoring the steel line pumping assembly in the well, the anchoring section comprises a plurality of hydraulically activatable anchoring elements (81) extendable from the body of the tool, to engage with the tubing.

12. A steel line pumping assembly (1) according to any of the preceding claims, wherein the first valve is a stationary valve fixed in relation to the tubular pump housing and the second valve is a movable valve movable with the plunger in relation with tubular pump housing. 52-1104-15

13. A steel line pumping assembly (1) according to any of the preceding claims, wherein the steel line pumping assembly is adapted to the pump at a flow rate of approximately 5-15 liters per minute.

14. A steel line pumping system (10) comprising a steel line pumping assembly (1) according to any of claims 1-13, and a plug device (3) for providing a seal on an annular section ( 62) between the plug device and the tubing, the plug device comprises: a base part (31) having a through hole (32) adapted to be connected to the tubular pump housing of the pump section, and one or more seal elements (34) disposed around the base portion extendable from the base portion to seal the annular section, wherein the steel line pumping assembly is adapted to connect with the plug device at the bottom of the bore after placing the plug device in the well. 52-1104-15

15. The use of the steel line pumping assembly according to any of claims 1-13, or a steel line pumping system according to claim 15 for initiation of a well killed by the removal of water present in the well using the action of pumping provided by the pumping assembly.

16. A method of initiating a well using a steel line pumping assembly according to any of claims 1-13, wherein it comprises the steps of: - insert the steel line pumping assembly into the borehole, placing a stopper device to provide a seal in an annular section (62) between the stopper device and the tubing, the stopper device comprises: a base part (31) having a through hole (32) adapted to be connected to the tubular pump housing of the pump section, and one or more seal elements (34) disposed around the base portion extendable from the base portion to seal the annular section, 52-1104-15 - operating the pump section of the steel line pumping assembly to pump fluid through the plug device until a pressure under the plug device is sufficient to cause the well to operate on its own. equalize the pressure on the plug to operate the equalizing valve, and - Remove the pumping assembly of the steel line from the well.

17. An optimization method of an initiation operation, comprising the steps of: - determine a level of pressure in the well under the plug device, sufficient to make the well operate on its own, - continuously monitoring the pressure in the well under the plug device while the pump section is operated to pump fluid from under the plug device to the top of the plug device, and - determining when the predetermined pressure level is reached, after which the operation of the pump section can be stopped. 52-1104-15 SUMMARY OF THE INVENTION The present invention relates to a steel line pumping assembly for entering a well bore or tubing and immersing in well fluid. The steel line pumping assembly extends in a longitudinal direction and is adapted to connect with a steel line. Additionally, the steel line pumping assembly comprises a pump section comprising a tubular housing that provides a pump chamber; one or more ports provided in a lower part of the tubular pump housing; a first valve to open and close the inlet; a plunger slidably disposed in the pump chamber, the plunger comprises a second valve which controls a flow of fluid from a first compartment of the pump chamber under the plunger to a second compartment of the pump chamber of the other side of the plunger; a pump rod operatively connected to the plunger and extending from the plunger through the tubular pump housing; and one or more outlets provided in an upper part of the tubular pump housing. The steel line pumping assembly further comprises a linear actuator arranged in a manner associated with the tubular pump housing for driving the pump rod, when the 52-1104-15 Pumping of steel line is submerged at least partially in the well fluid, the well fluid is brought into the tubular pump housing through one or more of the inlets, is moved through the second valve of the plunger , and expelled through one or more of the outlets in the upper part of the tubular pump housing, wherein the linear actuator comprises a tubular piston cylinder comprising one or more piston elements slidably disposed in the piston housing to divide the piston housing into a first chamber and a second chamber, a piston shaft operatively connected to the piston member and to connect with the pump rod to provide reciprocating movement of the piston, a pump for alternately supplying hydraulic fluid under pressure to the first chamber and the second chamber of the tubular piston cylinder to reciprocate the piston element in the tubular piston cylinder, and an electric motor to drive the pump. Additionally, the invention relates to a use of the steel line pumping assembly, a method for starting a well using a steel line pumping assembly and a method of optimizing an initiation operation. 52-1104-15