NL2016185A - Method for counteracting land subsidence in the vicinity of an underground reservoir. - Google Patents

Method for counteracting land subsidence in the vicinity of an underground reservoir. Download PDF

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Publication number
NL2016185A
NL2016185A NL2016185A NL2016185A NL2016185A NL 2016185 A NL2016185 A NL 2016185A NL 2016185 A NL2016185 A NL 2016185A NL 2016185 A NL2016185 A NL 2016185A NL 2016185 A NL2016185 A NL 2016185A
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NL
Netherlands
Prior art keywords
production
reservoir
perforations
housing
cracks
Prior art date
Application number
NL2016185A
Other languages
Dutch (nl)
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NL2016185B1 (en
Inventor
Fennechienes Alberts Bert
Original Assignee
Halpa Intellectual Properties B V
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
Application filed by Halpa Intellectual Properties B V filed Critical Halpa Intellectual Properties B V
Priority to NL2016185A priority Critical patent/NL2016185B1/en
Priority to US16/072,936 priority patent/US20190040712A1/en
Priority to EP17718136.9A priority patent/EP3408495B1/en
Priority to PCT/NL2017/050054 priority patent/WO2017131520A1/en
Priority to HUE17718136A priority patent/HUE048324T2/en
Priority to ES17718136T priority patent/ES2762158T3/en
Priority to PL17718136T priority patent/PL3408495T3/en
Publication of NL2016185A publication Critical patent/NL2016185A/en
Application granted granted Critical
Publication of NL2016185B1 publication Critical patent/NL2016185B1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
    • E21B33/138—Plastering the borehole wall; Injecting into the formation
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/025—Consolidation of loose sand or the like round the wells without excessively decreasing the permeability thereof

Abstract

The invention relates to a method for counteracting land subsidence due to activities, such as production of resources, involving transport of materials to or from an underground reservoir (R) through a well (P) having a well bore (B) running in the direction of the reservoir. The method comprises the step of bringing reinforcing material into a casing present in the wellbore (B) and making the reinforcing material flow out through perforations in the casing for forming a number of reinforcing objects (D) of reinforcing material around the wellbore (D).

Description

METHOD FOR COUNTERACTING LAND SUBSIDENCE IN THE VICINITY OF AN UNDERGROUND RESERVOIR
The present invention generally relates to a method for counteracting land subsidence in the vicinity of an underground reservoir accessible through a number of wellbores.
Land subsidence is a known negative side effect of production of natural resources, for example hydrocarbons, from an underground reservoir through a well. Extraction of hydrocarbons causes compaction of the reservoir rock leading to subsidence at ground level. Land subsidence causes environmental damage and effects water management. When earth layers are compacted near a natural fault, tension may build up and the earth layers will start shifting in a disruptive manner causing earthquakes. In recent years production of gas from the Groningen gas field in the north eastern part of The Netherlands has led to numerous claims for damages to buildings resulting from earthquakes caused by the gas production.
Many buildings in the area show visible damage, such as cracks in the walls.
The present invention has for its object to provide a method to prevent or minimize land subsidence due to activities, such as production of (natural) resources, involving transport of materials to and/or from an underground reservoir through a well having a well bore running in the direction of the reservoir.
According to the invention this object is achieved by the method steps of bringing reinforcing material into a casing present in the wellbore and making the reinforcing material flow out through perforations in the casing for forming a number of reinforcing objects of reinforcing material around the wellbore.
The reinforcing objects reinforce the reservoir soil surrounding the well bore and adequately prevent land subsidence. Furthermore, the reinforcing material replaces the fluids extracted from the reservoir to prevent the compaction of the reservoir rock.
According to a first preferred embodiment the reinforcing objects have a dome shaped cross-section. Advantageously the dome shape enables the reinforcing objects to withstand high loads from surrounding layers, for instance salt layers, and consequently attribute to prevent land subsidence.
According to a further preferred embodiment a suitable type of reinforcing material comprises grout.
In another preferred embodiment the reinforcing objects are formed around a substantially horizontal part of the wellbore to maximally support the well bore and to create an enhanced supporting surface in the surrounding soil.
In order to create reinforcing objects that completely surround the well bore the perforations are present in circumferential patterns in the casing.
Advantageously use is made of production perforations present in the casing for production of resources, such as hydrocarbons. Optionally additional perforations are made to the production perforations present in the casing for production of resources, such as hydrocarbons.
Suitable equipment for use in the method includes a pump being used to bring the reinforcing material into the casing. In a practical preferred embodiment tubing provided with a nozzle head is used to make the reinforcing material flow out through the perforations in the casing.
In an optimized preferred embodiment the casing is dividable in sections by seals.
According to a second preferred embodiment the method comprises the step of forming cracks in the reservoir surrounding the wellbore and filling the cracks with the reinforcing material for forming the reinforcing objects. The second embodiment is specifically suitable for use in a reservoir of non-permeable soil, such as shale or rock.
According to a preferred elaboration of the second preferred embodiment the cracks are formed using the reinforcing material. The two separate steps of forming the cracks and forming the reinforcing objects are then effectively combined.
According to an alternative elaboration of the second preferred embodiment the cracks are formed using fracking liquids.
In an efficient elaboration of the second preferred embodiment the reservoir is hardened, for example by Nitrogen injection, prior to forming the cracks.
According to a general preferred embodiment the wellbore remains intact for production of the resources.
When performing the method according to the invention for reinforcing a number of adjacent wellbores, a pattern of reinforcing objects is defined around the adjacent wellbores creating a foundation platter. Such a foundation platter can support a plurality of buildings, such as a village, while leaving enough space for flow movements in the reservoir.
The invention will now further be described referring to the appending figures, in which:
Figure 1 shows a schematic overview of a land area in which several well bores run in the direction of a reservoir, wherein the method according to the invention has been applied;
Figure 2 schematically shows a cross section through part of a first reservoir, including a well bore, to illustrate a first embodiment of the method according to the invention;
Figure 3A schematically shows a cross section through part of a second reservoir, including a well bore, to illustrate a second embodiment of the method according to the invention in a first time period;
Figure 3B schematically shows a cross section through the well bore of figure 3A to illustrate the second embodiment of the method according to the invention in a second time period; and
Figure 3C schematically shows a cross section through the well bore of figure 3A to illustrate the second embodiment of the method according to the invention in a third time period.
In all figures equal reference numerals denote equal features.
Figure 1 shows a schematic overview of a production site for natural resources, such as hydrocarbons, in which several well bores B run from production wells P in the direction of a reservoir R. Parts D of the reservoir R are reinforced using the method according to the invention. A resulting foundation platter is created defining a pattern of reinforcing objects D around adjacent wellbores B. The dashed lines S indicate free space between the reinforcing objects D that leaves room flow movements of the hydrocarbons in the reservoir.
Figure 2 schematically shows a cross section through a well bore B1 of an underground reservoir R1 that has permeable soil to illustrate a first embodiment of the method according to the invention. Figures 3A through 3C schematically show a cross section through a well bore B2 of an underground R2 that has non-permeable soil to illustrate a second embodiment of the method according to the invention in different time periods. In each of the figures 3A through 3C A a section is cut out and shown in more detail.
In both reservoirs R1, R2 the well bore B1, B2 comprises a casing 10 that is inserted into a recently drilled section of the wellbore. The casing 10 is typically held into place with cementation 12. Casing 10 normally has a tubular shape receiving an internal elongate hollow tubing 11 that in the position of use runs in the direction of the reservoir. An annulus A surrounds the tubing 11 and is itself surrounded by the well wall formed by the casing 10 and the cementation 12.
In tubing 11 production equipment is received. An example of suitable production equipment is a Wireline Retrievable Oil Production (WROP) system of which a nipple 20 is shown. The WROP system has been described in the international patent application W02014/011043 of the same applicant. Herein a so called Wireline Retrievable Oil Production (WROP) system is described for the production of hydrocarbons.
Seals or packers 21 are present to close of sections of the casing 10.
Perforations 14 connect the interior of the casing 10 with the surroundings of the casing 10, i.e. the reservoir soil. Consequently, the perforations 14 also extend through the cementation 12. Typically, the perforations 14 are production perforations for production of resources, such as hydrocarbons. Optionally additional perforations are made in the casing. Preferably the additional perforations are alternate to the production perforations. The preferred pattern for the perforations is a circumferential pattern.
In general the method according to the invention for counteracting land subsidence due to activities involving material transport, such as production of resources, through wellbores comprises the step of bringing reinforcing material into the casing 10 present in the wellbore B1 or B2. A pump may be used to bring the reinforcing material into the casing 10.
The reinforcing material is made to flow out through the perforations 14 in the casing 10 to form a number of reinforcing objects D1 respectively D2 around the wellbore B1 respectively B2. Dedicated equipment provided with a nozzle head may be used.
Suitable reinforcing materials are injectable materials that will attach to the reservoir area and the outer well wall and will harden as a result of a reaction, for example a chemical reaction or a thermal reaction. The reinforcing material may comprise grout, resin, such as epoxy resin, polyurethane resin or polyester resin, glass fibre, silicon rubber, starch or any combination thereof. Several choices are available to the person skilled in the relevant art.
The reinforcing objects D are formed around a substantially horizontal part of the wellbore B.
Optionally a sliding sleeve valve 30 is used to control fluid flow between the tubing 11 and the annulus A. Suitable sliding sleeve valves are known in the field of gas and oil exploration and production.
When applying the method according to the invention the wellbore remains intact for production of the resources. The resources flow out of the reservoir into the casing 10 in a direction of flow F that is substantially transverse to the casing 10. As seen in the direction F the reinforcing objects D1 and D2 have a dome shaped cross-section. As seen in longitudinal direction of the casing 10 the reinforcing objects D1 and D2 have a general ring shape.
The first embodiment of the method according to the invention comprises the steps described above and is suitable for a reservoir R1 of permeable soil, as illustrated in figure 2.
The second embodiment comprises additional steps prior to the steps described above and is suitable for a reservoir R2 of non-permeable soil, such as shale or rock, illustrated in figures 3A - 3C.
These additional steps relate to creating tracked reservoir areas FR2. According to the second embodiment the method comprises the steps of forming cracks in the reservoir R2 surrounding the wellbore B2 and filling the cracks for forming the reinforcing objects. The cracks can either be formed using the reinforcing material itself or using fracking liquids. Suitable fracking liquids comprise water and proppants, such as sand or plastic. Prior to forming the cracks the reservoir R2 may be hardened, for example by Nitrogen injection.
The tracked reservoir areas FR2 are preferably alternately used for production of resources. In figure 3A as an example four tracked reservoir areas FR2 are shown in a first time period of which the second and the fourth FR2 (seen from left to right) are production areas and provided with arrows F. In the first and the third FR2 passageways from the perforations 14 to the tubing 11 are closed by dedicated equipment. An example of suitable equipment are sleeve valves or side doors 30 that are slideable over the outer surface of the tubing 11, preferably under wireline control. By way of illustration next to some of the perforations 14 areas C are drawn to indicate closed passageways. The areas C are imaginary areas and have no physical embodiment.
Figure 3B shows the view of figure 3A in a second time period that is later than the first time period. The second and the fourth FR2 are no longer used as production areas, but have been transformed into reinforcing objects D2 using the method according to the invention. Optionally the passageways to perforations 14 are closed by dedicated equipment, for example the sleeve valves 30. Now the first and the third FR2 have become production areas.
Figure 3C shows the view of figure 3B in a third time period that is later than the second time period. The first and the third FR2 are also no longer used as production areas, but have also been transformed into reinforcing objects D2 using the method according to the invention. Optionally the passageways to perforations 14 are closed by dedicated equipment, for example the sliding sleeve valves 30. Water can be injected into the thus treated well bore to use the well bore as heat exchanger for geothermal application. Optionally a WROP - HEX is a Heat Exchanger Plug-in device 40 as described in W02014/011043 is used.
The invention is based on the general inventive thought to actively reinforce a well bore running towards an underground reservoir using reinforcing material and transporting it through the well bore to form reinforcing objects around the well bore.
Although the invention has been illustrated in the context of reinforcing well bores on a hydrocarbon production site, the invention is not limited to well bores for transport of hydrocarbons or other materials out of an underground reservoir. The method according to the invention can also be used to reinforce well bores used for transport of materials into an underground reservoir, for instance for the purpose of underground storage. Some examples of underground storage include disposal of nuclear waste or filling salt cavities with fluids. The method according to the invention can then also be used to reinforce well bores used for (continuous) transport of materials into and out of an underground reservoir, for instance for geothermal applications.
The invention is consequently not limited to the described and shown preferred embodiment. The invention relates generally to any embodiment falling within the scope of protection as defined in the claims and as seen in the light of the foregoing description and accompanying drawings.

Claims (16)

1. Werkwijze voor het tegengaan van landverschuiving ten gevolge van activiteiten, zoals productie van grondstoffen, welke activiteiten omvatten transport van materialen naar en/of uit een ondergrondse reservoir (R; R1; R2) door een put (P) met een boorgang (B; B1; B2), die in de richting van het reservoir verloopt, waarbij de werkwijze de stappen omvat van het brengen van versterkingsmateriaal in een behuizing (10) aanwezig in de boorgang en het laten uitstromen van het versterkingsmateriaal via perforaties (14) in de behuizing voor het vormen van een aantal versterkingsobjecten (D; D1; D2) van het versterkingsmateriaal rond de boorgang.A method for preventing landslide due to activities, such as production of raw materials, which activities comprise transport of materials to and / or from an underground reservoir (R; R1; R2) through a well (P) with a borehole (B ; B1; B2) extending in the direction of the reservoir, the method comprising the steps of introducing reinforcement material into a casing (10) present in the borehole and flowing out the reinforcement material through perforations (14) in the housing for forming a plurality of reinforcement objects (D; D1; D2) of the reinforcement material around the bore. 2. Werkwijze volgens conclusie 1, waarbij de versterkingsobjecten (D; D1; D2) een koepelvormige dwarsdoorsnede hebben.Method according to claim 1, wherein the reinforcement objects (D; D1; D2) have a dome-shaped cross-section. 3. Werkwijze volgens conclusie 1 of 2, waarbij het versterkingsmateriaal een mengsel van water en cement omvat.The method of claim 1 or 2, wherein the reinforcing material comprises a mixture of water and cement. 4. Werkwijze volgens één of meer van de voorgaande conclusies, waarbij de versterkingsobjecten (D; D1; D2) zijn gevormd rond een in hoofdzaak horizontaal deel van de boorgang (B; B1, B2).Method according to one or more of the preceding claims, wherein the reinforcement objects (D; D1; D2) are formed around a substantially horizontal part of the bore (B; B1, B2). 5. Werkwijze volgens één of meer van de voorgaande conclusies, waarbij de perforaties (14) aanwezig zijn in omtrekspatronen in de behuizing (10).Method according to one or more of the preceding claims, wherein the perforations (14) are present in circumferential patterns in the housing (10). 6. Werkwijze volgens conclusie 5, waarbij gebruik wordt gemaakt van productieperforaties, die aanwezig zijn in de behuizing (10) voor productie van grondstoffen, zoals koolwaterstoffen.The method of claim 5, wherein use is made of production perforations that are present in the housing (10) for production of raw materials, such as hydrocarbons. 7. Werkwijze volgens conclusie 6, waarbij additionele perforaties worden gemaakt in aanvulling op de productieperforaties, die aanwezig zijn in de behuizing (10) voor productie van grondstoffen, zoals koolwaterstoffen.The method of claim 6, wherein additional perforations are made in addition to the production perforations that are present in the housing (10) for production of raw materials, such as hydrocarbons. 8. Werkwijze volgens één of meer van de voorgaande conclusies, waarbij een pomp wordt gebruikt om het versterkingsmateriaal in de behuizing (10) te brengen.Method according to one or more of the preceding claims, wherein a pump is used to introduce the reinforcement material into the housing (10). 9. Werkwijze volgens één of meer van de voorgaande conclusies, waarbij buisvormige elementen (11) voorzien van een spuitkop worden gebruikt om het versterkingsmateriaal te laten uitstromen door de perforaties (14) in de behuizing (10).Method according to one or more of the preceding claims, wherein tubular elements (11) provided with a spray head are used to allow the reinforcement material to flow out through the perforations (14) in the housing (10). 10. Werkwijze volgens conclusie 9, waarbij de behuizing (10) is onder te verdelen in secties door middel van afdichtingen (21).The method of claim 9, wherein the housing (10) is subdivided into sections by means of seals (21). 11. Werkwijze volgens één of meer van de voorgaande conclusies, waarbij de werkwijze de stap van het vormen van scheuren omvat in het reservoir (R2), dat de boorgang (B2) omgeeft, en het vullen van de scheuren met het versterkingsmateriaal voor het vormen van de versterkingsobjecten (D2).A method according to any one of the preceding claims, wherein the method comprises the step of forming cracks in the reservoir (R2) surrounding the bore (B2), and filling the cracks with the reinforcing material for forming of the gain objects (D2). 12. Werkwijze volgens conclusie 11, waarbij de scheuren worden gevormd onder gebruikmaking van het versterkingsmateriaal.The method of claim 11, wherein the cracks are formed using the reinforcing material. 13. Werkwijze volgens conclusie 11, waarbij de scheuren worden gevormd onder gebruikmaking van scheurvormende vloeistof (fracking liquid).The method of claim 11, wherein the cracks are formed using cracking liquid. 14. Werkwijze volgens conclusies 11 tot en met 13, waarbij het reservoir wordt verhard, bij voorkeur middels stikstof injectie, voorafgaand aan het vormen van de scheuren.A method according to claims 11 to 13, wherein the reservoir is hardened, preferably by nitrogen injection, before forming the cracks. 15. Werkwijze volgens één of meer van de voorgaande conclusies, waarbij de boorgang (B; B1; B2) intact blijft voor productie van de grondstoffen.Method according to one or more of the preceding claims, wherein the bore hole (B; B1; B2) remains intact for production of the raw materials. 16. Werkwijze volgens één of meer van de voorgaande conclusies, waarbij een patroon van versterkingsobjecten (D; D1; D2) wordt gedefinieerd rond aangrenzende boorgangen (B; B1; B2) waardoor een funderingsplateau wordt gevormd.A method according to any one of the preceding claims, wherein a pattern of reinforcement objects (D; D1; D2) is defined around adjacent boreholes (B; B1; B2) thereby forming a foundation platform.
NL2016185A 2016-01-29 2016-01-29 Method for counteracting land subsidence in the vicinity of an underground reservoir. NL2016185B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL2016185A NL2016185B1 (en) 2016-01-29 2016-01-29 Method for counteracting land subsidence in the vicinity of an underground reservoir.
US16/072,936 US20190040712A1 (en) 2016-01-29 2017-01-27 Method for counteracting land subsidence in the vicinity of an underground reservoir
EP17718136.9A EP3408495B1 (en) 2016-01-29 2017-01-27 Method for counteracting land subsidence in the vicinity of an underground reservoir
PCT/NL2017/050054 WO2017131520A1 (en) 2016-01-29 2017-01-27 Method for counteracting land subsidence in the vicinity of an underground reservoir
HUE17718136A HUE048324T2 (en) 2016-01-29 2017-01-27 Method for counteracting land subsidence in the vicinity of an underground reservoir
ES17718136T ES2762158T3 (en) 2016-01-29 2017-01-27 Method to counteract land subsidence in the vicinity of an underground deposit
PL17718136T PL3408495T3 (en) 2016-01-29 2017-01-27 Method for counteracting land subsidence in the vicinity of an underground reservoir

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2016185A NL2016185B1 (en) 2016-01-29 2016-01-29 Method for counteracting land subsidence in the vicinity of an underground reservoir.

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NL2016185A true NL2016185A (en) 2017-08-02
NL2016185B1 NL2016185B1 (en) 2017-08-10

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NL2016185A NL2016185B1 (en) 2016-01-29 2016-01-29 Method for counteracting land subsidence in the vicinity of an underground reservoir.

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US (1) US20190040712A1 (en)
EP (1) EP3408495B1 (en)
ES (1) ES2762158T3 (en)
HU (1) HUE048324T2 (en)
NL (1) NL2016185B1 (en)
PL (1) PL3408495T3 (en)
WO (1) WO2017131520A1 (en)

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Publication number Publication date
PL3408495T3 (en) 2020-03-31
ES2762158T3 (en) 2020-05-22
WO2017131520A1 (en) 2017-08-03
US20190040712A1 (en) 2019-02-07
HUE048324T2 (en) 2020-07-28
EP3408495A1 (en) 2018-12-05
NL2016185B1 (en) 2017-08-10
EP3408495B1 (en) 2019-10-30

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