WO2015040042A1 - Detection of a watered out zone in a segmented completion - Google Patents

Detection of a watered out zone in a segmented completion Download PDF

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Publication number
WO2015040042A1
WO2015040042A1 PCT/EP2014/069755 EP2014069755W WO2015040042A1 WO 2015040042 A1 WO2015040042 A1 WO 2015040042A1 EP 2014069755 W EP2014069755 W EP 2014069755W WO 2015040042 A1 WO2015040042 A1 WO 2015040042A1
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WO
WIPO (PCT)
Prior art keywords
liner
water
dispenser unit
release mechanism
traceable
Prior art date
Application number
PCT/EP2014/069755
Other languages
French (fr)
Inventor
Robert BOUKE PETERS
Original Assignee
Mærsk Olie Og Gas A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DKPA201370516 priority Critical
Priority to DKPA201370516 priority
Application filed by Mærsk Olie Og Gas A/S filed Critical Mærsk Olie Og Gas A/S
Publication of WO2015040042A1 publication Critical patent/WO2015040042A1/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/10Locating fluid leaks, intrusions or movements
    • E21B47/1015Locating fluid leaks, intrusions or movements using tracers: using radioactivity
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/10Locating fluid leaks, intrusions or movements
    • E21B47/102Locating fluid leaks, intrusions or movements using electrical indications: using light radiations

Abstract

The invention relates to a system and a method for detecting water in a segmented wellbore with a liner. The system comprises a dispenser unit, a traceable component positioned in the dispenser unit, a detection system configured to react on contact with water present outside the liner, the detection system reacts by triggering a release mechanism. The release mechanism is associated with said dispenser unit and capable of releasing at least one traceable component when triggered whereby the traceable component enters the fluid flowing through the liner. The method comprises the steps of measuring the amount of water Aw present in the annulus at any given time, comparing the measured amount of water Aw with a reference input Ai, and when the measured amount of water Aw is larger or equal to the reference input Ai for a given time or given number of measurements, then an activation signal is sent to a release mechanism of a dispenser unit which release mechanism is activated thereby releasing a traceable component.

Description

Detection of a watered out zone in a segmented completion Technical Field

The invention relates to a system and a method for detecting water in a segmented wellbore with a liner.

Background

Wells are drilled into the earth to allow recovery of hydrocarbons such as paraffins, napthenes, aromatics and asphaltics or gases such as methane. These wells may be vertical, deviated e.g. at an angle or horizontal depending on the size, location and nature of the reservoir into which they are drilled.

Casing or liner is run to protect or isolate formations adjacent to the wellbore. It is generally not possible to drill a well through all of the formations from the surface or the seabed to the target depth in one whole section. For example, fresh-waterbearing zones (usually found only near the surface) must be protected soon after being penetrated. The well is therefore drilled in sections, with each section of the well-being sealed off by lining the inside of the borehole with steel pipe, known as casing, and filling the annular space i.e. the annulus, or at least the lower portion of the annulus between this casing string and the borehole with cement. Then drilling commences on the subsequent hole section, necessarily with a smaller bit diameter that will pass through the newly installed casing. A liner is a casing string that does not extend to the surface; the liner installation allows larger drill pipe or production tubing to be used in the upper portions of the well.

Once the well bore is drilled, a series of liners and tubings may be installed. Such elements are known as completion.

The annulus might be filled with cement to prevent axial flow along the length of the well but can also be penetrated to allow fluid flow in some desired areas.

Open hole completions have no cement in the annulus but may still contain a tubular liner. This may be installed where it is considered that the wellbore could collapse. Such wells without completions are referred to as "barefoot". This type is the most basic, but can be a good choice for hard rock, multi-laterals and underbalance drilling. It involves leaving the productive reservoir section without any tubulars. This effectively removes control of flow of fluids from the formation; it is not suitable for weaker formations which might require sand control, or for formations requiring selective isolation of oil, gas and water intervals. However, advances in interventions such as coiled tubing and tractors means that barefoot wells can be successfully produced. Movement of water in channels within the casing/borehole annulus is a problem in oilfield production and injection operations. Such channels can provide an undesirable communication path between formations of different pressures and reduce well efficiency. Particularly undesirable is the upward channelling of such fluids as oilfield brines might flow into shallow freshwater aquifers thereby polluting a source of drinking water. Different methods detecting and locating fluid flow behind well casing are already known, such as use of temperature, acoustic noise and radioactive-tracer logs.

In segmented wells, the well is segmented into a number of discrete zones, where each zone is isolated from its neighbours by annular packers placed between a liner and the well bore and only receives oil and water from this part of the reservoir or formation. Such segmentation makes it possible to attribute water production to an isolated zone of the well.

However, water is regularly present in the annulus without this being a result of a water breakthrough. E.g. :

- wells might be completed in water based fluids which means that the

casing/borehole annulus is filled with water before the wells are actually active and fluid has been produce from the reservoir, or

- wells might momentarily produce at elevated water cuts due to being closed for some length of time causing fluids in the well to gravity segregate with water collecting in the bottom of the well and oil/gas at the top, or

- wells momentarily produces at elevated water cuts due to being submitted to interventions such as acid stimulation or tubing water washing, which might result in short duration high water presence near the sensors.

According to prior art, each of the above given situations might results in that a tracer release reaction taking place, although the above situations are not the result of an uncontrolled water flow outside the lining. Such false positive reactions will make it difficult to decide when actions against high annular water flow are to be taken and also an unnecessary consummation of tracers would take place.

The present invention relates to a tracking system which makes it possible to detect water presence in a segmented well by releasing a tracer or traceable component into the flow. More particularly, the present invention relates to a tracking system comprising a plurality of sensors and tracers combined with proper software allowing surveillance of how the water flow changes over time. The signal to take action is defined by pre-defined patterns appearing in the annular water flow changes, not by release of a single tracer.

Tracer technologies are currently available in several forms.

WO 2001/81914 discloses a method for reservoir monitoring comprising dividing regions around wells in the reservoir into a number of sections, and injecting or placing specific tracers with unique characteristics for each section into the formation in these regions. The tracers are chemically immobilized/integrated in the formation or in constructions/filters around the wells, the tracers (tracer carriers) being chemically intelligent and released as a function of specific events. Detecting the tracers downstream provides information about the various zones. The tracer release mechanism could be a degradation process of the matrix holding the tracers by weak forces or by breakage of a bond between tracers and reservoir formation or packing material (page 8, line 16-22). This means that the tracer is released through direct contact between the tracer and the activating fluid i.e. oil or water. The amount of released tracer material will be a function of the local activating fluid flow rate or production rate (page 10, lines 16-22).

WO 2007/102023 describes a similar concept with novel materials being used. It also describes a method of applying tracer material to a well via detonation. The proposal is that tracer material is introduced into the path of explosive energy from a perforation tool, which is known equipment within the industry. Detonation of the perforation charge shall then scatter the tracer in the well. This method applies the tracers as residue from an explosive detonation. A disadvantage is that there is uncertainty over the amount of tracer that will be applied to the wall of the wellbore. Detonation may also not completely transfer the tracer in its path. The tracer is released into a liquid in which it is dissolvable and then flows with the liquid through the well (Page 6, line 34 - page 7, line 9).

Regardless of how chemical tracers may be applied to the wellbore, the current state of technology is that fluid samples must be collected from the wellhead and analysed at a remote laboratory. There is no immediate method of determining the presence of known tracer elements in fluids from the well. However, WO

2011/132040 describes the concept of detecting chemical tracers at the well head rather than by remote analysis.

US 2009/0151939 discloses a method for improved determination of dynamic subsurface conditions [0010], particularly relative to the travelling of mud during drilling conditions. In the example shown in figs. 1 and 2 show a system including a drill string 20 comprising a series of drill pipes 21 disposed within a borehole 22 which traverses through a formation F while the boreholes is cut by the action of a drill bit 24. A Bottom Hole Assembly (BHA) 26 contains a number of devices possibly including a release unit 44 as shown in fig. 2. The release unit 44 can be positioned anywhere along the drill string 20 [0026] . The release unit 44 can comprise chambers 50, 52 holding traceable tags 10, release mechanisms 54, 56 which can be activated by a local processor 48 can selectively release tags 10 via forced or pressurized ejection e.g. pneumatic, hydraulic, electronic or mechanically or via direct exposure of the tags 10 to the mud flow [0028] . The traceable tags 10 are released in response to a received signal, not as a result of presence of a particular fluid. Also, tag release unit 44 may be implemented with a sensor 46 adapted to sense a subsurface characteristic or condition (e. g. pressure, temperature, fluid composition, flow rates, etc). Sensors of these types are well known technology, as are the means to power the sensors. However, when using tracers during mud-drilling the process will not include considerations of long-term use of the tracers.

The above references all relate to methods whereby chemical tracers are dissolved into a component of the well stream, be it water or hydrocarbons. The chemical tracers dissolve into any amount of this well fluid being present. No control is exercised, i.e. no lower limit of e.g. water flow can be defined, below which a tracer does not become active.

Summary

The invention relates to a system detecting and indicating water flow between liner and wellbore in a completed well having a wellbore extending through a

subterranean formation, the system comprising :

- a dispenser unit;

- a traceable component positioned in the dispenser unit;

- a detection system configured to react on contact with water present outside the liner, which detection system comprises a control unit and more than one sensor and each sensor forwards a signal to the control unit, sensor parts of said detection system is exposed to the exterior of the liner while the dispenser unit is exposed to the interior of said liner, the detection system reacts by triggering a release mechanism;

- said release mechanism is associated with said dispenser unit and capable of releasing at least one traceable component when triggered whereby the traceable component enters the fluid flowing through the liner. "Outside the liner" means between the liner and the well bore i.e. in the annulus.

That the release mechanism is able to release a traceable component means that the release mechanism is able to force a traceable component out of the dispenser unit or detach a traceable unit from the dispenser unit in such a way that the traceable component is passed into the fluid flow in the liner and normally carried downstream toward a reader or monitoring unit which is able to detect the chosen traceable component.

All parts of the system can be integrated parts of the liner meaning that the system of the invention is installed together with the liner during reservoir completion. That the parts of the system are integrated with the liner means that each part of the system either is attached to or constituted by the liner e.g. the dispenser unit could at least partly be a cavity in the liner wall in which case the dispenser unit is partly constituted by the liner. If all parts of the system are integrated parts of the liner it will not be necessary to install parts of the system after the reservoir completion has finished and this will reduce the cost of the installation.

The present invention is based on physical detection methods, not measuring of a concentration of a component. The invention uses that one or more physical properties of an unwanted fluid (water) such as resistivity, density, salinity, etc. differs from the same physical properties of the wanted fluid. By doing so, a lower limit can be defined below which the system remains inactive. Detection is by means of instrumentation and can be fitted with logic (PLC) to establish minimum conditions beyond which a signal to surface is triggered.

A detection system according to the invention can comprise an electrical resistivity sensor array able to register the amount of water present.

I.e. the detection system may comprise one or more electrical resistivity sensor(s) able to register the amount of water present. Normally, a multiplicity of sensors - regardless of which physical property each sensor registers - will be distributed along the length and around the outer periphery of the lining thereby forming an array of sensors. Such an array of sensors is able to detect presence of water in the whole annulus of the segment i.e. along the whole outer circumference of the liner,

Generally, a system according to the invention might comprise a well segment having a plurality of sensors distributed around the outer circumference of the liner of the segment such as in a helical pattern.

Generally, each sensor according to a system according to the invention is connected to one or more dispenser unit(s). Generally, the traceable component according to the invention may comprise a RFID unit, which could be either active or passive.

According to one embodiment of the system, the release mechanism may comprise means for receiving an activation signal from the detection system. Also, the release mechanism may comprise driving means able to force at least one traceable component from the dispenser unit into the fluid flow of the well when receiving an activation signal.

According to one embodiment of the system, a sensor part of the detection system may be exposed to the exterior of the liner while the dispenser unit may be exposed to the interior of said liner. According to this embodiment, it would be possible that the detection system is also exposed to the interior of the liner and/or that the dispenser unit is also exposed to the exterior of the liner.

According to one embodiment of the system, an exit opening of the dispenser unit may be positioned approximately at level with the inner surface of said liner.

The invention also relates to a method for detecting and indicating water flow in the annulus between liner and wellbore in a completed well having a wellbore extending through a subterranean formation, the method comprising the steps of:

- measuring presence of water at each sensor position at any given time,

- comparing the pattern of positive measurements with a reference pattern of measurements indicating presence of water,

- when the registered pattern of water presence is consistent with pre-defined patterns indicating water-breakthrough, then an activation signal is sent to a release mechanism of a dispenser unit which release mechanism is activated and a traceable component released.

According to one embodiment of this method, a control unit such as a

Programmable Logic Controller might be applied when comparing the registered pattern with the reference reference patterns.

According to any embodiment of the above method, an amount of water Aw present in the annulus at any given time is measured by a physical detection method measuring a physical property such as resistivity, density, conductivity,

capacitance, heat capacity, temperature, salinity, optical phenomenons (refractive index), hydrogen decay or others. There will always be some water in the annular space and a measurement expressing the amount of water Aw should take into account that water is present in the annular space in different forms as oil, water and gas phases co-exist in the annular space at all times and as the flow of the mixture might change between laminar and turbulent.

Designing and operating such a system i.e. normally by programming a PLC, includes defining a dynamic state that forms a lower limit i.e. a reference input A,, Such a dynamic state is constituted of a combination of readings from several sensors, combined with how the readings from these sensors change in time relative to each other thereby describing the state of the dynamic system in the annular space. The measured amount of water Aw is therefore not to be understood as a single value from a sensor but is understood to be a defined state calculated from the readings of a sensor array.

In order to be able to attribute water production to an isolated zone of the well, a water detection system according to the invention can be installed as part of the liner or in connection with the liner during completion of the well.

A zone of the well or reservoir is normally isolated by packers i.e. a piece of downhole equipment that consists of a sealing device, a holding or setting device, and an inside passage for fluids.

A system according to the invention comprises a detection system which detection system is able to detect water flow in the annular space between the well bore walls and a liner. The detection system is at least partly positioned on or as part of the outer surface of the liner or is somehow attached to the outer surface of the liner. The detection system can consist of an electrical resistivity sensor as illustrated in figure 1, but the detection system may also use other principles such as sensors measuring variations in capacitance, temperature, salinity, optical phenomenons or others. The system will normally be powered by a battery and can further contain a PLC (Programmable Logic Controller) or the like to determine minimum threshold conditions beyond which a release of a detectable tracer can be activated. Different detection systems for detecting water are known as such and a skilled person which implements the invention according to the claims could choose any appropriate detection system as the optimum choice might depend on local conditions.

A system according to the invention also comprises a dispenser unit in which unit a number of or an amount of a traceable component and a release mechanism is kept. A trigger mechanism which triggers or activates the release mechanism might physically be positioned either with the detection system or with the dispenser unit.

When the detection system detects that water is present above a predetermined threshold and for more than a predetermined period of time, a traceable

component, e.g. in form of a RFID tag, is released into the well flow stream. The traceable component will be released into the well flow stream because the dispenser unit is in communication with the inner surface of the liner. In particular, the dispenser unit may be arranged in an opening, or may be placed in connection with or attached to the inner surface of the liner. The traceable component can be identified downstream of the well flow, normally at the wellhead, by a monitoring device.

If the traceable component is a RFID tag, then the tag is programmed with a unique code, identifying the segment of the well where the water flow is observed. An RFID can be easily detected at the surface by a reader installed on the flow wing. Alternatively, the traceable component may be any suitable chemical marker which can be detected when released in portions.

Generally, a system according to the invention comprises at least one dispenser unit holding one or more, normally a plurality, of traceable components, and the dispenser unit may in particular comprises a housing providing a shell which protects the inner parts. The housing normally comprises an exit opening through which one or more traceable components can leave the dispenser unit when triggered. An end of the dispenser unit provided with an exit opening may face towards the fluid flowing in the well when the dispenser unit is in its operational position with the liner. The dispenser unit may be positioned in the wall of the liner. The dispenser unit comprises a release mechanism and may comprise a trigger mechanism. Alternatively, the dispenser unit is associated with a trigger

mechanism, and the release mechanism is capable of releasing a traceable component when triggered by the trigger mechanism. When the release

mechanism is triggered, a single traceable component or a plurality of traceable components can be expelled from the dispenser unit and may thereby enter the fluid flow in the well. This makes it possible to detect the traceable component downstream in the well, normally at the wellhead.

In embodiments of the invention the release means may comprise driving means capable of forcing one or more traceable components out of an exit opening of the dispenser unit. The driving means may comprise an energy source which energy source may be in the form of stored chemical energy and may be converted into electrical energy.

The triggering mechanism can be selected to be activated either once or several times. The trigger mechanism can be activated by a trigger signal received from a detecting system comprising e.g. a multiplicity of sensors and a PLC.

The traceable components may be chemical in what case the traceable component may be detectable by its presence in a certain concentration or the traceable component may emit energy due to a change of state which energy can be detected such as radiation. Chemical traceable components as such are known and available, and can be used in a system according to the present invention when installed into a dispenser unit.

Alternatively, the traceable components may be electronic. For example, the traceable component may emit a signal originating from an electromagnetic field, and the traceable component can for example be either an active or a passive component. Electronic traceable components such as Radio Frequency Identification (RFID) tags or other passive devices are known as such and can be used in a system according to the present invention when installed into a dispenser unit.

When a dispenser unit is positioned with the liner, the traceable components may be released over time and may be carried in the fluid flow to the surface. The traceable components should preferably be immediately detectable at the surface by an appropriate technology depending on the nature of the traceable component.

Sensors and dispensers will normally be run as a dedicated subassembly in the liner i.e. the sensors and dispensers are attached to the walls of the liner and are placed together with other parts of the liner during setting up of the liner.

List of figures

An exemplary embodiment according to the invention is illustrated in the figures:

Figure 1 illustrates a segmented well provided with a detecting system according to the invention.

Figure 2 discloses an embodiment of a dispenser holding RFID tags. Detailed description

Figure 1 discloses an exemplary and non-limiting embodiment of a system according to the invention. The system is placed in a wellbore extending through the formation 11 with an inner wellbore surface 13. A liner 12 is shown placed in the wellbore providing a defined path for fluids produced in the well, a large arrow indicates the flow direction inside the liner.

A dispenser unit 1 is attached to the wall of the liner 12 and a small arrow indicates how a traceable component 4 is released into the flow of the production well. In order to be able to release a traceable component in to the flow of the production well, the dispenser unit 1 is extending beyond the inner surface 10 of the liner 12.

In the shown example, a single resistivity sensor is placed between the annulus and the inner surface of the wellbore for illustration. However, a detection system 20 will normally be based on an array of sensors which are positioned in the annulus between the liner 12 and the inner surface 13 of the wellbore.

Figure 2 discloses an embodiment of a dispenser unit 1 holding traceable components 4. The dispenser unit 1 is placed in the liner having one end facing the fluid flow in the well. The dispenser unit 1 comprises a housing 7 which housing might be a separate shell or might be constituted by the material of the liner.

Internally the housing 7 has two sections, a first section 2 holding the traceable components 4 and a second section 3 holding driving means 8. In the shown embodiment the two sections are positioned in extension of each other and in mutual communication, however the sections could be placed differently in relation to each other depending on both what kind of traceable components are used and what kind of driving means are used. Normally the first section 2 is reduced in volume during operation whereas the volume of the second section 3 is increased in volume during operation.

The first section 2 is placed at the end of the dispenser unit 1 facing the fluid flow in the well; this end of the housing of the dispenser unit 1 comprises an exit opening 5 through which the traceable components can pass when leaving the dispenser unit 1 and entering into the fluid flow of the well. The housing 7 providing the outer walls for this end of the dispenser unit 1 of the shown embodiment is cylindrical. The traceable component 4 shown in fig. 2 is a single RFID tag. The second section 3 is according to the shown embodiment placed at the end of the dispenser unit facing away from the fluid flow in the well i.e. the end which during use is embedded in the liner wall or which may form part of the liner wall.

In fig. 2A the dispenser unit 1 has been positioned in the sidewall of a liner 12, around 7% of the length of the dispenser unit protrudes relative to the surface 10 of the sidewall. The driving means placed in second section 3 has not yet been activated and all the traceable components 4 are still held in the first section 2 of the dispenser unit. In fig. 2B driving means placed in second section 3 has been activated and three of the traceable components have been pushed out of the dispenser unit and into the flow of the well.

The driving means 8 of the second embodiment can be a micro or linear motor which forces traceable components in form of RFID tags into well. The motor dispenses traceable components into the well when activated by the trigger system which receives an activation signal from the detecting system.

In fig. 2 the surface 10 illustrates the inner surface of the liner 12 along which the fluid of the production well flows, the grey matter 11 illustrates the material constituting the walls of the liner. The dispenser units 1 need not be fully buried in the wall but the dispenser units should be placed in a position deep enough or close enough to allow free passage of fluids and equipment in the well. Preferably, a short part of the length of the dispenser unit should protrude from the surface 10 of the walls, such that an exit opening of said dispenser unit is positioned a short distance above the liner wall surface, in order to ensure that the traceable components, when released, are caught in the flow of the well and not caught by irregularities in the wall. However, the dispenser unit should not extend into the wellbore with a length of more than 5% of the diameter of the wellbore, preferably with a length of maximum 1% of the diameter of the wellbore in order to allow passage for tools through the wellbore. If the exit opening of the dispenser unit is placed a distance beneath the surface this would increase the risk of traceable components being caught by irregularities of the surrounding walls.

Generally, the dispenser unit may contain an aggregation of a traceable component or it may contain a plurality of traceable components. The embodiment of fig. 2 contains 12 traceable components. If the traceable components were of a chemical type the dispenser unit would contain an amount of traceable component and release a discrete portion of traceable component upon activation. In other words, the term "traceable component" as used herein may designate an aggregate or discrete portion of a traceable component or an aggregate number of individual traceable component elements or an individual traceable component element.

The combination of application of RFID technology with well-known detection methods is very advantageous.

When applying the system of the present invention, the following method is used to detect water flowing between liner and wellbore, or between tubing and liner in a completed well having a wellbore extending through a subterranean formation :

1) a detection system continuously or discretely measures amount of water Aw present in the annulus, 2) the detection system continuously or discretely compares measured amount of water Aw with a reference input A,,

3) when the measured amount of water Aw is larger or equal to A, for a given time or given number of measurements, then a signal is sent to a dispenser unit, the release mechanism of the dispenser unit is activated and releases a traceable component,

4) a reader unit placed downstream of the monitored well records and notifies the passage of a traceable component when it is detected and gives information of from which segment of the well the traceable component originates. Based on the information from the reader unit it can be decided whether any remedial action has to be taken.

According to an aspect of the invention, the invention relates to a system detecting and indicating water flow between liner and wellbore in a completed well having a wellbore extending through a subterranean formation, the system comprising :

- a dispenser unit;

- a traceable component positioned in the dispenser unit;

- a detection system configured to react on contact with water present outside the liner, the detection system reacts by triggering a release mechanism;

- said release mechanism is associated with said dispenser unit and capable of releasing at least one traceable component when triggered whereby the traceable component enters the fluid flowing through the liner. According to an embodiment of the above aspect of the invention, the detection system comprises an electrical resistivity sensor array able to register the amount of water present.

According to an embodiment of the above aspect or the above embodiment of the invention, the detection system contains a control unit such as a Programmable Logic Controller.

According to any embodiment of the above aspect of the invention, the traceable component comprises a RFID unit.

According to any embodiment of the above aspect of the invention, the release mechanism comprises means for receiving an activation signal from the detection system, and the release mechanism comprises driving means able to force at least one traceable component from the dispenser unit into the flow of the well when receiving the activation signal.

According to any embodiment of the above aspect of the invention, a sensor part of said detection system is exposed to the exterior of the liner while the dispenser unit is exposed to the interior of said liner.

According to any embodiment of the above aspect of the invention, an exit opening of said dispenser unit is positioned approximately at level with the inner surface of said liner.

According to a second aspect of the invention, the invention relates to a method for detecting and indicating water flow in the annulus between liner and wellbore in a completed well having a wellbore extending through a subterranean formation, the method comprising the steps of:

- measuring the amount of water Aw present in the annulus at any given time, - comparing the measured amount of water Aw with a reference input A,,

- when the measured amount of water Aw is larger or equal to the reference input Ai for a given time or given number of measurements, then an activation signal is sent to a release mechanism of a dispenser unit which release mechanism is activated and releasing a traceable component.

According to an embodiment of the above second aspect of the invention, a control unit such as a Programmable Logic Controller compares the measured amount of water Aw with the reference input A,. According to an embodiment of the above second aspect of the invention, the amount of water Aw present in the annulus at any given time is measured by a physical detection method measuring a physical property such as resistivity, density, conductivity, capacitance, heat capacity, temperature, salinity, optical phenomenons (refractive index), hydrogen decay or others.

Claims

Claims
1. A system detecting and indicating water flow between liner and wellbore in a completed well having a wellbore extending through a subterranean formation, the system comprising :
- a dispenser unit;
- a traceable component positioned in the dispenser unit;
- a detection system configured to react on contact with water present outside the liner, which detection system comprises a control unit and more than one sensor and each sensor forwards a signal to the control unit, sensor parts of said detection system is exposed to the exterior of the liner while the dispenser unit is exposed to the interior of said liner, the detection system reacts by triggering a release mechanism;
- said release mechanism is associated with said dispenser unit and capable of releasing at least one traceable component when triggered whereby the traceable component enters the fluid flowing through the liner.
2. A system according to claim 1, wherein the detection system comprises an electrical resistivity sensor array able to register the amount of water present.
3. A system according to claim 1 or 2, wherein the detection system comprises a Programmable Logic Controller.
4. A system according to any previous claim, wherein the traceable component comprises a RFID unit.
5. A system according to any previous claim, wherein the release mechanism comprises means for receiving an activation signal from the detection system, and the release mechanism comprises driving means able to force at least one traceable component from the dispenser unit into the flow of the well when receiving the activation signal.
6. A system according to any previous claim, wherein an exit opening of said dispenser unit is positioned approximately at level with the inner surface of said liner.
7. A system according to any previous claim, wherein a well segment has a plurality of sensors distributed around the outer circumference of the liner of the segment such as in a helical pattern.
8. A system according to any previous claim, wherein each sensor is connected to one or more dispenser unit(s).
9. A method for detecting and indicating water flow in the annulus between liner and wellbore in a completed well having a wellbore extending through a
subterranean formation, the method comprising the steps of:
- measuring presence of water at each sensor position at any given time,
- comparing the pattern of positive measurements with a reference pattern of measurements indicating presence of water,
- when the registered pattern of water presence is consistent with pre-defined patterns indicating water-breakthrough, then an activation signal is sent to a release mechanism of a dispenser unit which release mechanism is activated and releasing a traceable component.
10. A method according to claim 9, wherein a control unit such as a Programmable Logic Controller compares the registered pattern with the reference reference patterns.
11. A method according to claim 9 or 10, wherein an amount of water Aw present in the annulus at any given time is measured by a physical detection method measuring a physical property such as resistivity, density, conductivity,
capacitance, heat capacity, temperature, salinity, optical phenomenons (refractive index), hydrogen decay or others.
PCT/EP2014/069755 2013-09-17 2014-09-17 Detection of a watered out zone in a segmented completion WO2015040042A1 (en)

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