EP2924230A1 - Bohrloch-Sammelwerkzeug - Google Patents

Bohrloch-Sammelwerkzeug Download PDF

Info

Publication number
EP2924230A1
EP2924230A1 EP14161754.8A EP14161754A EP2924230A1 EP 2924230 A1 EP2924230 A1 EP 2924230A1 EP 14161754 A EP14161754 A EP 14161754A EP 2924230 A1 EP2924230 A1 EP 2924230A1
Authority
EP
European Patent Office
Prior art keywords
section
downhole system
tool
axial force
collection
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP14161754.8A
Other languages
English (en)
French (fr)
Inventor
Sven Karsten Jensen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Welltec AS
Original Assignee
Welltec AS
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 Welltec AS filed Critical Welltec AS
Priority to EP14161754.8A priority Critical patent/EP2924230A1/de
Publication of EP2924230A1 publication Critical patent/EP2924230A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/12—Grappling tools, e.g. tongs or grabs
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/06—Sleeve valves
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
    • E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons

Definitions

  • the present invention relates to a downhole system for collecting an object in a well.
  • a ball In order to fracture the formation to increase hydrocarbon-containing fluid production, a ball is dropped into a well casing. Furthermore, dropping of balls is also used to inject fluid into the formation from an injection well. The ball flows down the casing and seats in a ball seat of a sliding sleeve. Subsequently, the pressure is built up inside the casing upstream of the ball until the sleeve slides to open a fracturing port, and then the fluid is pumped out into the formation to fracture the formation.
  • the most commonly used fracturing or injection process is to have balls of increasing diameter, so that the smallest ball is dropped first to seat in the seat of the sliding sleeve being most remote from the top of the well.
  • one ball is reused for opening at least two ports in that dogs are released when the sleeve has been opened.
  • the balls After the fracturing or injection process, the balls need to be collected from the well in order to start the production of hydrocarbon-containing fluid from the reservoir or to inject injection fluid at a level below the ball.
  • the balls In an injection well, the balls are never brought to surface by the production fluid, as the production starts due to a higher pressure in the formation.
  • the fluid in an injection well always flows from the top of the well to the bottom.
  • an object such as a ball seated in a restriction
  • a downhole system for collecting an object in a well comprising:
  • the above-mentioned restriction may be a sliding sleeve.
  • the restriction may have a ball seat.
  • the restriction may have a casing shoe.
  • the object may be a ball.
  • the tool section may comprise a means adapted to provide an adhering force between the collection section and the object, so that the object can be removed along with the collection tool.
  • Said means may be an axial force generator adapted to provide the axial force for forcing the abutment edge into the object and providing the adhering force.
  • the abutment edge may have a cutting edge for cutting at least partly into the object.
  • the abutment edge may have a sealing lip creating an inner space between the collection section and the object.
  • sealing lip may be made of a polymer or of natural or synthetic rubber.
  • the tool section may comprise means adapted to provide an adhering force between the collection section and the object, the means being a pump adapted to provide a pressure difference in the inner space which provides the adhering force.
  • the collection section may comprise a retractable protective part which is arranged to form a leading part of the collection section when the tool moves towards the object.
  • the retractable protective part may have an at least partly circular cross-section and may be arranged within or outside the abutment edge.
  • a shear pin may be arranged to prevent the retractable protective part from sliding axially before the axial force exceeds a predetermined threshold value.
  • the axial force generator as described above may comprise:
  • the axial force generator may generate the axial force in the range of 400-5,000 kg, preferably 500-3,000 kg.
  • the object may be made of a non-metallic material, such as polymer, blends of polymers and particles of non-plastic material, composite, phenolic, glass or ceramics; or aluminium, bronze or stainless steel.
  • the polymer may be epoxy or polyether ether ketone (PEEK).
  • the cutting edge may be inclining or tapering.
  • the cutting edge may be a continuous or a non-continuous circumferenting edge.
  • the downhole system as described above may further comprise a driving unit for the system to be self-propelling.
  • Fig. 1 shows a downhole system 100 for collecting an object 2, such as a ball, in a casing 3 of a well 4.
  • the casing comprises a plurality of tubular sections 5 and a restriction 6 having a first inner diameter D r .
  • the object has an outer diameter D o which is larger than the first inner diameter of the restriction in order that the object is capable of seating in the restriction, e.g. to open a fracturing or injection port 11 by sliding a sleeve 14, to close off part of the well below the seated object, or to close a casing shoe in the end of the casing.
  • the downhole system further comprises a collection tool 1 for collecting the object.
  • the collection tool 1 comprises a tool section 7 adapted to provide an axial force F in a first direction to retrieve the object from the well.
  • the collection tool 1 further comprises a collecting section 8 having an outer diameter OD cs .
  • the collecting section 8 is connected to the tool section 7 and comprises an abutment edge 9 forming a leading edge 10 when the tool section moves the collection section in the first direction for abutting the object.
  • the outer diameter of the collection section is smaller than the outer diameter of the object so that the tool is able to pass previous restrictions 6B while still being able to abut a proper area of the object.
  • the tool section comprises a means adapted to provide an adhering force between the collection section and the object, so that the object can be removed along with the collection tool when retracting the tool from the well.
  • the means is an axial force generator 15 adapted to provide the axial force for forcing the abutment edge 9 into the object and thus providing the adhering force by means of friction between the abutment edge 9 and the object 2.
  • the abutment edge has a cutting edge for cutting at least partly into the object by pushing the cutting edge of the abutment edge into the object by means of the axial force generator 15.
  • the cutting edge is a continuous circumferenting edge but may also be non-continuous.
  • the abutment edge is then stuck in the object, and tests have shown that the object can hold up to 6,000 N when the axial force generator 15 forces the abutment edge and thus the cutting edge into the object by 3,000 N.
  • the object is sufficiently fastened to the abutment edge for the object to be retrieved from the well even though the tool has to pass several restrictions along the way which results in several bumping movements while travelling up to 15 km before reaching the top of the well.
  • the tool section 7 comprises means adapted to provide an adhering force between the collection section and the object.
  • the means is an axial force generator 15 adapted to provide the axial force for forcing the abutment cutting edge into the object and providing the adhering force between the abutting edge and the object by cutting into the object.
  • An anchoring section 16 anchors the tool in the well, so that all axial force from the axial force generator is used to cut into the object.
  • the abutment edge has a sealing lip 17 creating an inner space 18 (illustrated in Fig. 3 ) between the collection section 8 and the object 2 when the sealing lip abuts the face 19 of the object 2.
  • the sealing lip is made of a polymer or of natural or synthetic rubber and may be reinforced by metal strands or woven material, e.g. woven plastic, or by means of a similar solution.
  • the tool section 7 comprises means adapted to provide an adhering force between the collection section and the object, the means being a pump 20 adapted to provide a pressure difference in the inner space 18 which provides the adhering force between the sealing lip 17 and the face 19 of the object 2.
  • the downhole system may further comprise a driving unit 12, such as a downhole tractor, for the system to be self-propelling in a more horizontal part of the well.
  • a driving unit 12 such as a downhole tractor
  • the downhole system comprises an anchoring section 16 which anchors the tool section in the casing.
  • the downhole system may comprise both a driving unit 12 and an anchoring section 16.
  • the restriction is a ball seat 21 in a sliding sleeve 14, as shown in Fig. 4A .
  • the ball 2 moves the sleeve 22 so as to open the fracturing port 11.
  • the sliding sleeve has dogs 23 which are pushed into a groove 24 when the sleeve 22 has been sufficiently slid as shown in Fig. 4B , and the object in the form of a drop ball is able to pass the sliding sleeve and move onto the next sliding sleeve to be opened further down the well.
  • the drop ball has opened all sleeves, the ball is seated in a fixed seat as shown in Fig. 5 .
  • the casing may have several restrictions 6, 6B (shown in Figs. 1 and 2 ) that the tool has to be capable of passing before reaching the object to be retrieved.
  • the tool therefore needs to have an outer diameter which is smaller than that of the restriction, and then the outer tool diameter is also smaller than the outer diameter of the object, i.e. the ball.
  • the tool 1 cannot have means enclosing the ball and thus enlarging the tool diameter and still be able to pass the restrictions as the tool moves up to the top of the well.
  • the collection section and the tool section having diameters which are smaller than that of the ball, the tool is still able to pass the restrictions when moving upwards, since the object could pass the same restrictions while moving downwards.
  • the adhering force in the form of the cutting edge pushed into the object or in the form of a pump providing a negative pressure in the inner space, the tool is capable of collecting the ball even though its diameter is restricted.
  • the ball In an injection well, the ball often seats in a fixed seat for closing off the part of the well below the seated ball. In this way, the fluid is injected at the intended level and thus in the intended layer in the formation.
  • the collection section 8 comprises a retractable protective part 25 which is arranged to form a leading part 26 of the collection section when the tool moves towards the object 2.
  • the retractable protective part 25 has an at least partly circular cross-section.
  • the retractable protective part 25 may have a non-continuous edge forming the leading edge but is in Fig. 6 shown as a continuous edge.
  • the retractable protective part 25 is arranged within the abutment edge 9, but may also be arranged outside the abutment edge. As can be seen, the cutting edge is inclining or tapering radially inwards.
  • a shear pin 27 is arranged to prevent the retractable protective part from sliding axially before the axial force exceeds a predetermined threshold value.
  • the axial force generator 15 may be a stroking tool as shown in Fig. 8 for providing the force F.
  • the axial force generator 15 comprises an elongated piston housing 35 having a first 36 and a second 37 end, and a piston 38 provided on a shaft 39.
  • the shaft penetrates the housing for transmitting the axial force to the collection section.
  • the piston is provided in the piston housing so that the shaft penetrates the piston and each end of the piston housing and divides the housing into a first chamber 41 and a second 42 chamber.
  • the first chamber and/or the second chamber are/is fluidly connected to the pump via a duct 43, so that the pump 32 can pump fluid 45 into one chamber and/or suck fluid from the other chamber in order to move the piston within the housing and thereby move the collection section in the first direction.
  • the housing comprises a hollow housing 44 closed in each end by a ring 45 within the hollow housing, the rings having sealing means 46 for providing a sealing connection to the shaft.
  • the axial force generator generates the axial force which may be in the range of 4,000-50,000 N, preferably 5,000-30,000 N.
  • the object may be made of a non-metallic material, such as polymer, blends of polymers and particles of non-plastic material, composite, phenolic, glass or ceramics; or aluminium, bronze or stainless steel.
  • the polymer may be epoxy or polyether ether ketone (PEEK).
  • the restriction may be any suitable restriction capable of receiving the object, thus the restriction may also be a casing shoe.
  • a stroking tool is a tool providing an axial force.
  • the stroking tool comprises an electrical motor for driving a pump 32.
  • the pump pumps fluid into a piston housing to move a piston acting therein.
  • the piston is arranged on the stroker shaft.
  • the pump may pump fluid into the piston housing on one side and simultaneously suck fluid out on the other side of the piston.
  • fluid or well fluid any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc.
  • gas is meant any kind of gas composition present in a well, completion, or open hole
  • oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc.
  • Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
  • a casing any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.
  • a downhole tractor can be used to push the tool all the way into position in the well.
  • the downhole tractor may have projectable arms having wheels, wherein the wheels contact the inner surface of the casing for propelling the tractor and the tool forward in the casing.
  • a downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP14161754.8A 2014-03-26 2014-03-26 Bohrloch-Sammelwerkzeug Withdrawn EP2924230A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14161754.8A EP2924230A1 (de) 2014-03-26 2014-03-26 Bohrloch-Sammelwerkzeug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14161754.8A EP2924230A1 (de) 2014-03-26 2014-03-26 Bohrloch-Sammelwerkzeug

Publications (1)

Publication Number Publication Date
EP2924230A1 true EP2924230A1 (de) 2015-09-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14161754.8A Withdrawn EP2924230A1 (de) 2014-03-26 2014-03-26 Bohrloch-Sammelwerkzeug

Country Status (1)

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EP (1) EP2924230A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3434859A1 (de) * 2017-07-25 2019-01-30 Welltec A/S Abfragesystem

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1421159A (en) * 1920-12-18 1922-06-27 Brown Charles Henry Grapple
US1528089A (en) * 1922-08-24 1925-03-03 Grover G Stimpert Fishing tool
EP2599952A1 (de) * 2011-11-30 2013-06-05 Welltec A/S Zugwerkzeug

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1421159A (en) * 1920-12-18 1922-06-27 Brown Charles Henry Grapple
US1528089A (en) * 1922-08-24 1925-03-03 Grover G Stimpert Fishing tool
EP2599952A1 (de) * 2011-11-30 2013-06-05 Welltec A/S Zugwerkzeug

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3434859A1 (de) * 2017-07-25 2019-01-30 Welltec A/S Abfragesystem
WO2019020590A1 (en) * 2017-07-25 2019-01-31 Welltec A/S RECOVERY SYSTEM
CN110892131A (zh) * 2017-07-25 2020-03-17 韦尔泰克有限公司 取回系统
US10641054B2 (en) 2017-07-25 2020-05-05 Welltec A/S Retrieval system
AU2018305900B2 (en) * 2017-07-25 2021-04-08 Welltec A/S Retrieval system
RU2762039C2 (ru) * 2017-07-25 2021-12-15 Веллтек A/С Извлекающая система

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