NO344351B1 - A method of use in a well which includes providing a removable electric pump in a completion system - Google Patents

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This claims the benefit under 35 U.S.C. §119(e) of the U.S. provisional application Serial No. 60/894,495, entitled "Method and Apparatus for an Active Integrated Well Construction and Completion System for Maximum Reservoir Contact and Hydrocarbon Recovery", filed Mar. 13, 2007; and the U.S. provisional application Serial No. 60/895,555, entitled, "Method and Apparatus for an Active Integrated Well Construction and Completion System for Maximum Reservoir Contact and Hydrocarbon Recovery", filed Mar. 30, 2007, both hereby incorporated by reference.

TECHNICAL AREA

[0002] The invention generally relates to guiding a pipe string including a pipe and an isolation valve into a well, and guiding a tool string including an electric pump for engagement on the inside of the pipe string.

BACKGROUND

[0003] A completion system is installed in a well to produce hydrocarbons (or other types of fluids) from reservoir(s) adjacent to the well, or to inject fluid into the reservoir(s) through the well. In some wells it may be desirable to provide an artificial lifting mechanism, such as in the form of an electric submersible pump (ESP). However, to perform overhaul operations in a well, it may be desirable to remove the ESP, such as to replace or repair the ESP at the surface, or to perform another overhaul operation. Traditionally, to remove an ESP, a pipe string that includes a pipe (eg, production pipe or injection pipe) must be removed with the ESP, which is a time-consuming and expensive operation, especially in removing locations such as subsea wells. Conventional completion systems that include ESPs do not provide for flexible communication of hydraulic and/or electrical signals between different sections of the completion systems.

US6328111 (B1) describes a method for installing a submersible pump assembly that allows use in a well operating under pressure. A pressure barrier may be installed in the well at a location lower than a length of the submersible pump assembly.

SUMMARY

[0004] In general, according to one embodiment, a method for use in a well comprises introducing into the well a pipe string including a pipe and an isolation valve, where the pipe string is designed to receive an electric pump. A first wet connection part in the pipe string is connected with a corresponding second wet connection part which is part of a well completion section. A tool string including the electric pump is inserted into the inner bore of the pipe to engage the inside of the pipe string. Removal of the pipe string including the electric pump without removing the pipe string is made possible due to the presence of the isolation valve. The isolation valve has an internal bore through which overhaul equipment can pass to perform an overhaul operation below the isolation valve. A completion system may include a first completion section with a first part of a hydraulic wet connection mechanism, and a second completion section with a second part of the hydraulic wet connection mechanism, where the first and second parts of the hydraulic wet connection mechanism are connectable when the second completion section is coupled with the first completion section. In addition, the completion system includes an electric pump coupled to the second completion section.

[0005] Other or alternative properties will appear from the following description, from the drawings and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Fig.1 illustrates an electric pump-ready completion system installed in a well, according to one embodiment.

[0007] Fig.2 illustrates the completion system in Fig.1 with the electric pump installed, according to one embodiment.

[0008] Figs. 3A-3B illustrate embodiments for providing an electric pump cable through a coiled tube, according to one embodiment.

[0009] Fig.4 illustrates an alternative embodiment of an electric pump-ready completion system.

[0010] Fig.5 illustrates the completion system in Fig.4 with the electric pump installed, according to another embodiment.

[0011] Fig.6 illustrates a further embodiment of an electric pump-ready completion system.

[0012] Fig.7 illustrates yet another embodiment of a completion system with an electric pump installed.

[0013] Fig.8 illustrates yet another further embodiment of an electric pump-ready completion system.

[0014] Fig.9 illustrates another embodiment of a completion system with an electric pump installed.

[0015] Fig. 10 illustrates a completion system for use in a multilateral well, where the completion system includes an electric pump, according to one embodiment.

DETAILED DESCRIPTION

[0016] In the following description, many details are presented to provide an understanding of the present invention. However, it should be understood by those skilled in the field that the present invention can be practiced without these details and that many variations and modifications from the described embodiments are possible.

[0017] As used herein, the terms "above" and "below" indicate; "up and down"; "upper" and "lower"; "up" and "down" and other similar terms relative positions above or below a given point or element are used in this description to more clearly describe some embodiments of the invention. However, when applied to equipment and methods for use in wells that are deviated or horizontal, such designations may refer to a left-to-right, right-to-left, diagonal relationship as appropriate.

[0018] According to some embodiments, an electric pump ready completion system may be installed in a well, where the electric pump ready completion system includes a pipe string with a pipe and an isolation valve. The tubing string is capable of receiving a tool string that includes the electric pump. After engaging the tool string including the electric pump on the inside of the pipe string, the pipe string including the electric pump can then be removed without removing the pipe string. This is made possible by the presence of the isolation valve which is part of the pipe string. The tubing string also has a first wet connection portion for engagement with a second wet connection portion of a well completion section. The wet connection parts can be inductive coupler parts (to provide electrical wet connection) and/or hydraulic wet connection parts.

[0019] By being able to remove the electric pump without removing the pipe string, work operations involving the repair or replacement of the electric pump, or other types of operations where the electric pump must first be removed (in this way to enable access for completion equipment past the electric pump), cost and time savings are achieved since removing the tool string with the electric pump is much easier than removing the entire pipe string.

[0020] In one implementation, an electric pump includes an electric submersible pump (ESP), which is activated by electric power. In other implementations, the electric pump can be any other type of pump that can be activated by electric power. In the following discussion, reference is made to an ESP. However, it must be established that some embodiments of the invention can be used for other types of electric pumps.

[0021] Fig.1 illustrates an embodiment of an ESP-ready completion system capable of receiving a tool string including the ESP. The completion system is installed in a well 100, which can be a single-well drilling well or a multilateral well with one or more lateral branches. The well 100 is lined with casing pipe 102.

[0022] The completion system includes a lower wellbore completion section 104 having a lateral branch liner 114 to connect a lateral branch 112 to the main wellbore. In an alternative implementation, however, the lateral branch 112 may be omitted. The lower completion section 104 is connectable with an indexing liner coupling 117 or other mechanism to set the position and orientation of the lateral branch liner 114.

[0023] The lower completion section has portions of both a hydraulic wet connection mechanism and an electrical wet connection mechanism provided on the lateral branch liner 114.

[0024] The electrical wet connection mechanism and hydraulic wet connection mechanism are provided to ensure that electrical coupling and hydraulic coupling occur between different sections of the completion system. The electrical wet connection mechanism includes an inductive coupler, made up of a first inductive coupler portion 116 (e.g., female inductive coupler portion), and a second inductive coupler portion 118 (e.g., male inductive coupler portion). The female inductive coupler part 116 is part of the lower completion section 104 and is attached to the lateral branch lining 114. The female inductive coupler part 116 is thus electrically connected to an electric cable segment 120 which extends from the female inductive coupler part 116 to equipment in the lateral branch 112.

[0025] The male inductive coupler part 118 is part of a pipe string which includes a larger pipe 140, a length compensation joint 108, and a pipe 110. The male inductive coupler part 118 is attached to the pipe 110 of the pipe string in the example in fig.1. The male inductance coupler portion is connected to an electrical cable segment 122 that extends upward through the length compensation joint 108 and a completion gasket 106 (also part of the tubing string) until a location is further drilled into the well 100. In some implementations, the electrical cable 122 may extend throughout the way to the earth's surface.

[0026] In this way, electrical power and/or signaling communicated over the electrical cable 122 can be provided through the inductive coupler (made up of inductive coupler parts 116 and 118) and over the electrical cable segment 120 to an electrical component in the lateral branch 112 (or alternatively, to an electrical component in the lower part of the main wellbore).

[0027] The hydraulic wet connection mechanism 124 provides that a hydraulic connection can be made in the presence of wellbore fluids between an upper completion section (tubing string) and the lower completion section 104. The hydraulic wet connection mechanism 124 includes a track 126 that can be guided around the periphery of a connection transition 128. Seals 130 and 132 are provided on the two sides of the groove 126 to provide a seal against leakage of hydraulic fluids in the groove 126. The groove 126 provides hydraulic connection between a hydraulic control line 134 and a hydraulic control line segment 126, which can extend from the hydraulic wet connection mechanism 124 into the lateral branch 112 or into the lower portion of the main wellbore. The hydraulic control line segment 124 extends around the length compensation joint 108 and extends upwardly through the completion gasket 106.

[0028] The pipe string above the completion package 106 has the larger pipe 140 (eg production pipe or injection pipe). The term "pipe" is assumed to refer to any line used to carry fluids. The tube may have a general cylindrical construction, or alternatively, may have other geometries. The lower end of the pipe 140 is attached to one isolation valve 142, such as a formation isolation valve implemented as a ball valve. In other implementations, other types of isolation valves can be used, such as flap valves, slide sleeve valves, etc.

[0029] The isolation valve 142 may be a mechanical isolation valve that is actuated by a mechanical shift tool lowered through the inner bore 144 of the pipe 140 for engagement with an actuator mechanism of the isolation valve 142.

Alternatively, the isolation valve 142 may be a surface-controlled isolation valve that is controlled by a control line 146 (eg, an electrical cable, fiber optic cable, hydraulic control line, etc.). In some implementations, the isolation valve 142 can be actuated by using both the mechanical shift tool and the control line.

[0030] Instead of using a separate control line 146 to actuate the surface-controlled isolation valve 142, the isolation valve 142 can instead be actuated by using a common control line that also controls another component.

[0031] When the isolation valve 142 is open, the fluid flow between the inner bore 144 of the pipe 140 and an inner bore 148 to a lower part of the pipe string below the isolation valve 142. On the other hand, when the isolation valve 142 is closed, the inner bore 144 of the pipe is and the inner bore 148 isolated from each other.

[0032] The pipe string in Fig. 1 also includes a surface-operated safety valve 150. The safety valve 150 is normally open, except during an abnormal event, such as an emergency, in which case the safety valve 150 is closed to isolate the portion of the well below the safety valve 150. example in Fig.1, the safety valve 150 is connected to a control line 152 (e.g. electrical cable or hydraulic control line) to control the safety valve 150. The safety valve 150 and the isolation valve 142 together provide two independent mechanical barriers for well control during ESP work over operation .

[0033] The completion system, shown in Fig. 1, is an ESP-ready completion system capable of receiving an ESP inside the larger pipe 140. Fig. 2 shows that a work string 201 including an ESP 200 has been installed on the inside of the larger pipe 140. The pipe string 201 including the ESP 200 is sunk into the inner bore 144 (Fig. 1) of the larger pipe 140. In examples in Fig. 2, the pipe string 201 which is sunk has a change tool 202 to engage an actuation mechanism for the isolation valve 142. When the shift tool 202 is lowered into the isolation valve 142, the shift tool engages the isolation valve 142 to open the isolation valve 142. On the other hand, if it is desired to remove the tool string including the ESP 200 from the pipe string, then the shift tool 202 engages the isolation valve 142 to close the isolation valve as the tool string is removed from the pipe string.

[0034] A polished bore receiver and seal assembly 204 is provided at the isolation valve 142 to provide sealing engagement of the lower portion of the tool string 201 in a portion of the pipe string. The tool string 201 also has a smaller pipe 206 (smaller than the larger pipe 140 of the pipe string) which is connected to the ESP 200. The smaller pipe 206 can be a coiled pipe or a spliced pipe. The smaller tube 206 has an internal bore 208 through which fluid can flow when the ESP 200 is activated.

[0035] ESP 200 is activated by an ESP cable 210 which is routed along the length of the smaller tube 206. ESP cable 210 can be an electrical cable or a fiber optic cable. The cable 210 extends through a gasket 212 which is provided on the outside of a smaller bore 206. The gasket 212 when installed occupies an inner wall of the larger pipe 140 to provide a seal between the smaller pipe 206 and the larger pipe 140.

[0036] With reference to fig.1 and 2, during operation, the lower completion section 104 is first introduced into the well 100. After the lower completion section 104 has been introduced into the well, the pipe string is then introduced into the well, where the pipe string occupies the lower completion section as shown in fig.1. The engagement of the pipe string with the lower completion section includes an electrical wet connection and a hydraulic wet connection utilizing the inductive coupler and hydraulic wet connection mechanism discussed above. After the pipe string is installed, the pipe string 201 including the smaller pipe 206 and ESP 200 is fed into the inner bore 144 of the larger pipe 140 for engagement with the inside of the larger pipe 140.

[0037] At a later time, when it is desired to remove the ESP 200 to perform an overhaul operation, such as to repair or replace the ESP 200 or to perform another overhaul operation with respect to a lower part of the completion system shown in Fig.2, the tool string 201 can be removed from the pipe string. It should be noted that the tool string 201 including the ESP 200 can be removed without having to remove the pipe string. This is made possible by the presence of the isolation valve 142, which is actuated to a closed position when the pipe string 201 is removed from the pipe string. The closing of the isolation valve 142 can be performed by using the shift tool 202, or alternatively, by the provision of a removed signal from the ground surface over the control line 146 to the isolation valve 142.

[0038] In some embodiments, control conduit 146 may be filled with nitrogen or other gas to perform control of the isolation valve. Alternatively, the control line 146 may be filled with a hydraulic fluid. In yet another variant, the control line may be an electrical control line. In yet another embodiment, two control lines can be used, one for opening and one for closing.

[0039] Figs. 3A and 3B show alternative implementations for providing the ESP cable 210 to the ESP 200. In the Figs. 3A-3B implementations, the ESP cable 210 is routed through the inner bore of the smaller tube 206, instead of on the outside of the smaller tube 206 as shown in fig.2. As shown in Fig. 3A, several sealing elements 302 and 306 may be arranged between the ESP cable 210 and the inner wall of the smaller tube 206. The sealing elements 302, 304, 306 may be swellable sealing elements formed of a swellable material, such as swellable rubber . The swellable rubber swells in the presence of a special chemical, which may be provided inside the smaller tube 206.

[0040] Fig. 3B shows a variant of the Fig. 3A implementation, with the Fig. 3B implementation having openings 308 in the smaller tube 206 to allow wellbore fluids to enter respective chambers 310 formed by the swellable sealing members 302, 304 and 306 .

[0041] Fig. 4 shows an alternative embodiment of an ESP-ready completion system, which has similar components to the completion system in Fig. 1 with the exception that a surface-controlled subsurface safety valve 400 in Fig. 4 is a deeply installed subsurface safety valve 400 which is provided below the isolation valve 142. The subsurface safety valve 400 is controlled by a control line 402, and the isolation valve 142 (if it is a surface controlled isolation valve) is controlled by one or more control lines 146. The remaining components of the completion system of Fig. 4 are similar to the components shown in fig.1.

[0042] Fig.5 illustrates installation of the tool string 201 including ESP 200 on the inside of the pipe string in Fig.4. The arrangement between the tool string 201 and the pipe string in fig.4 is similar to that shown in fig.2.

[0043] Fig.6 shows a further embodiment of an ESP-ready completion system. In the embodiment in Fig.6, at least the control line 608 (eg hydraulic control line) is used to control the isolation valve 142 and another component lower in the well. The lower part of the completion system in fig.6 (including the length compensation joint 108 and below) is similar to the lower part of the completion system shown in fig.1. In Fig.6, however, the completion system is divided into three segments: the lower completion section 104, an intermediate completion section 601 and a pipe string. The intermediate completion section 601 has a completion gasket 600, a second inductive coupler 602, and a second hydraulic wet connection mechanism 604. The intermediate completion section 601 also has the isolation valve 142, the length compensation joint 108 and the pipe 122. The pipe string in Fig.6 has a pipe 604 with a internal bore 606 to receive a removable ESP (not shown). The hydraulic control line 608 runs along the outside of the pipe 604, with the hydraulic control line extending through the gasket 610 on the outside of the pipe 604. The hydraulic control line 608 extends to the ground surface.

[0044] The hydraulic control line 608 is also provided to the hydraulic wet connection mechanism 604, which connects the hydraulic control line 608 to a hydraulic control line segment 612 below the hydraulic wet connection mechanism 604. The hydraulic control line segment 612 is hydraulically connected to the isolation valve 142 to control the isolation valve. Also, the hydraulic control line segment 612 extends through the length compensation joint 108 to the lower hydraulic wet linkage mechanism 124 (which is the same as the hydraulic wet linkage mechanism 124 in Fig.1.

[0045] An electrical cable 614 also extends from the ground surface through the gasket 610 to the inductive coupler 602. More specifically, the electrical cable 614 extends to a male inductive coupler portion 616 of the inductive coupler 602. A female inductive coupler portion 618 is provided adjacent the male inductive coupler portion 616 to allow coupling of electrical energy between the inductive coupler portions 616 and 618. The inductive coupler 602 is connected to an electrical cable segment 620, which extends through the length compensation joint 108 to the inductive coupler 124 (which is the same as the inductive coupler 124 in fig.1).

[0046] In the embodiment in fig.6, it should be noted that the pipe 604 is connected at its lower end to a shift tool 622, where the shift tool 622 can be used to actuate the isolation valve 142. Initially, the pipe is routed without the ESP pump. However, at a later time, the pipe string is pulled out of the hole and again introduced back into the hole with the ESP pump as shown in fig.7 for increasing production.

[0047] Fig.8 shows another embodiment of an ESP-ready completion system, which is divided into three sections: lower completion section 104A, intermediate section 703, and a pipe string. The lower completion section 104A includes a lateral branch liner 700 extending from the main wellbore to the lateral branch 112. The lateral branch liner 700 extends into the main wellbore to an isolation packing 705. Also provided on the lateral branch liner 700 is an inductive coupler portion 716 (which is part of an inductive coupler 714) and a portion of the hydraulic wet coupling mechanism 736. The inductive coupler portion 716, which may be a female inductive coupler portion, connected to an electrical cable segment 707 extending into the lateral branch 112. The hydraulic wet coupling mechanism 706 is connected to a hydraulic control line 738 which extends to the lateral branch 112.

[0048] The intermediate completion section 703 includes a lower pipe 709, and a gasket 711 which accommodates the lateral branch liner 700. The intermediate completion section 703 also has a support structure 713 to which the isolation valve 142 and a female inductive coupler portion 706 of an inductive coupler 704 are mounted. The isolation valve 142 is electrically connected to the inductive coupler 704, which further includes a male inductive coupler portion 708 to communicate with the female inductive coupler portion 706.

[0049] The inductive coupler 704 is electrically connected by another electrical cable segment 710 to the inductive coupler 714 which includes the female inductive coupler portion 716 and the male inductive coupler portion 718.

[0050] The male inductive coupler portion 718 of the inductive coupler 714 is electrically connected to an electrical cable segment 722 that extends to control station 724. Control station 724 includes processing elements, such as a processor (or processors), and other components, to ensure control of various electrical components in the completion system in fig.8. The control station 724 can optionally also include sensors, such as temperature and/or pressure sensors.

[0051] The control station 724 is again connected to an electrical cable 726 which extends through a gasket 728 to the ground surface. The gasket 728 is arranged on the outside surface of a pipe 730 (part of the pipe string) which extends into a part of the lower completion section. The pipe 730 has a shift tool 732 at its lower end for mechanical activation of the isolation valve 142.

[0052] Fig.8 also shows a hydraulic control line 734 (which may extend from the ground surface) which is connected to a hydraulic wet connection mechanism 736 to provide hydraulic communication between the hydraulic control line 734 and a hydraulic control line segment 738 that extends to the lateral branch 112 or to a lower part of the main wellbore.

[0053] The tube 730 has an internal bore 740 to receive an ESP, according to some embodiments. The ESP which is connected on the inside of the bore 740 to the pipe 730 has an ESP cable attached to it, where the ESP cable can be routed on the inside of the inner bore 740 to the pipe 730.

[0054] Fig.9 shows a variation of the completion system in Fig.8. In the implementation of Fig.9, an ESP 742 is installed in the pipe 730. The ESP 742 is electrically connected through a cable section member, which extends through a cable 744, which extends through the wall of the pipe 730) to an electrical cable 746. electric cable 746 extends to the earth's surface. The implementation of the ESP 742 and its electrical connection to an electrical cable is similar to the embodiment in Fig.7.

[0055] Fig. 10 shows another embodiment of a completion system where an ESP 800 is provided. The ESP 800 is arranged as part of a smaller tube 802 which is arranged inside a larger tube 804. A gasket 806 isolates the annulus region between the smaller tube 802 and the larger tube 804. The smaller tube 802 can be a coiled tube or joint tube.

[0056] A lower part of the smaller pipe 802 has a shift tool 808 for actuation of the isolation valve 142 which is attached to the larger pipe 804. The smaller pipe 802, the ESP 800 and the shift tool 808 can be considered as a tool string that can be connected to inside a pipe string that includes a larger pipe 804 and other components.

[0057] The pipe string shown in Fig. 10 also has attached to it the isolation valve 142 and the flow control valves 810 and 812 to control flow into different zones. In the example in Fig. 10, two zones are included in which the flow valves 810 and 812 are arranged for respective lateral branches 814 and 816. The flow control valve 810 thus controls flow between the inner bore 818 of the pipe string and the lateral branch 814, as the flow control valve 812 controls flow between the inner bore 818 of the pipe string and the lateral branch 816.

[0058] The flow control valves 810, 812 are controlled by one or more control lines 820, which may be a hydraulic control line. The control line 820 extends through a gasket 822 (provided between the pipe string and the casing pipe 102 to the ground surface. It should be noted that the control line 820 can also be used to control the isolation valve 142 or a separate control line is routed to the control isolation valve.

[0059] Hydraulic control line 820 also extends through another gasket 824 between the tubing string and feed pipe 102 to connect to the flow control valve 812. Alternatively, separate control line(s) may be routed to control each flow control valve 810 and 812. Additionally, hydraulic control line 820 extends control line 820 connects to a hydraulic wet connection mechanism 826 to ensure that hydraulic pressure in the control line 820 is communicated to flow pressure valves in the segmented main or parent bore of the well 828 below the hydraulic wet connection mechanism 826.

[0060] It should be noted that the control line segment 828 can be used to control another flow control valve 830 which is arranged in a lower completion section positioned in the lower part of the main wellbore.

[0061] Fig.10 also shows an electric cable 832 which extends from the ground surface through gasket 822 to a sensor 834 arranged on the pipe string. Measurements collected by the sensor 834 can be communicated over the electrical cable 832 to the ground surface. Examples of the sensor 834 include a temperature sensor, pressure sensor, fluid sensor, flow rate sensor, etc.

[0062] The electric cable 832 continues through the gasket 824 to another sensor 836. The sensor 834 is arranged to monitor parameters in the zone connected to the lateral branch 814, and the sensor 836 is arranged to monitor parameters in the zone connected to the lateral branch 816.

[0063] The electrical cable 832 continues through another gasket 825 to an inductive coupler 838 (which has a male inductive coupler portion 840 and a female coupler portion 842). The electrical cable 832 is electrically connected to the male inductive coupler portion 840 which is inductively coupled to the female inductive coupler portion 842 to provide communication of electrical energy to electrical cable segment 844 (which may be connected to an electrical device in the lower portion of the main wellbore , such as a sensor).

Claims (13)

PATENT CLAIMS 1. Procedure for use in a well (100, 828), characteristics in that it includes: introducing into the well (100, 828) a tubing string including a pipe and an isolation valve (142), wherein the tubing string is configured to receive an electric pump; connecting a first wet connection portion of the pipe string with a corresponding second wet connection portion that is part of a wellbore completion section; guiding a tool string (201) including the electric pump into a bore (144) of the pipe to engage the inside of the pipe string; removing the tool string (201) including the electric pump without removing the pipe string, the removal being made possible by the presence of the isolation valve (142); the isolation valve (142) having an internal bore (144) through which overhaul equipment can pass to perform an overhaul operation under the isolation valve (142). 2. Method according to claim 1, wherein guiding the tool string (201) including the electric pump comprises guiding the tool string (201) including an electric submersible pump (ESP) (200, 742, 800). 3. Method according to claim 1, wherein it further comprises routing at least one control line (146, 608) which jointly controls the isolation valve (142) and at least one other component in the well (100, 828). 4. Method according to claim 1, wherein it further comprises removably actuating the isolation valve (142) to a closed position for isolating a formation to enable removal of the tool string (201) including the electric pump. 5. Method according to claim 1, wherein coupling the first wet connection portion with the second wet connection portion comprises coupling a first hydraulic wet connection portion with a second hydraulic wet connection portion. 6. Method according to claim 1, wherein coupling of the first wet connection portion with the second wet connection portion comprises coupling of a first inductive coupler portion (116) with a second inductive coupler portion (118). 7. Method according to claim 1, further comprising coupling of a third wet connection part on the pipe string with a corresponding fourth wet connection part which is part of the wellbore completion section. 8. Method according to claim 7, wherein the first wet connection portion and the second wet connection portion form an inductive coupling, wherein the third wet connection portion and the fourth wet connection portion form a hydraulic wet connection mechanism. 9. Method according to claim 1, further comprising providing a subsurface safety valve on the pipe string. 10. Method according to claim 1, wherein the tool string (201) comprises a shift tool (202), and wherein insertion of the tool string (201) into the inner bore (144) of the pipe causes the shift tool to actuate the isolation valve (142) to an open position. 11. Method according to claim 1, wherein guiding the tool string (201) including the electric pump comprises guiding the tool string (201) including either a coiled pipe or a spliced pipe (206) attached to the electric pump. 12. Method according to claim 11, further comprising routing a pump cable (210) through the coil pipe or extension pipe (206) to electrically connect to the electric pump. 13. Method according to claim 12, further comprising providing swellable sealing members (302, 304, 306) between the pump cable (210) and an inner wall of one of the coiled pipe and the spliced pipe (206), wherein the swellable sealing members (302, 304, 306) swell under the presence of a special chemical to effect sealing by means of the swellable elements (302, 304, 306) in the coiled pipe or jointed pipe (206).