GB2533143A - Adjustable whipstock - Google Patents

Adjustable whipstock Download PDF

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Publication number
GB2533143A
GB2533143A GB1422070.1A GB201422070A GB2533143A GB 2533143 A GB2533143 A GB 2533143A GB 201422070 A GB201422070 A GB 201422070A GB 2533143 A GB2533143 A GB 2533143A
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GB
United Kingdom
Prior art keywords
whipstock
guide portion
mounting portion
adjustment
longitudinal axis
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Withdrawn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
GB1422070.1A
Inventor
Youell Charles
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.)
CLAXTON ENGINEERING SERVICES Ltd
Claxton Eng Services Ltd
Original Assignee
CLAXTON ENGINEERING SERVICES Ltd
Claxton Eng Services Ltd
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 CLAXTON ENGINEERING SERVICES Ltd, Claxton Eng Services Ltd filed Critical CLAXTON ENGINEERING SERVICES Ltd
Priority to GB1422070.1A priority Critical patent/GB2533143A/en
Publication of GB2533143A publication Critical patent/GB2533143A/en
Application status is Withdrawn legal-status Critical

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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
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • E21B7/06Deflecting the direction of boreholes
    • E21B7/061Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock

Abstract

A whipstock comprises a guide portion 10 including deflection surfaces 38 for deflecting a conductor 4. The guide portion 10 has a first longitudinal axis; an elongate mounting portion configured to engage with a conductor stub 4 where the mounting portion has a first end and a second end and a second longitudinal axis extending between said ends. Adjustment means, possibly in the form of securing plate 50 and adjustment member 12 are configured to secure the mounting portion to the guide portion 10 such that the first and second longitudinal axes are parallel to each other. The adjustment means comprises means for permitting movement of the second longitudinal axis away from and towards the first longitudinal axis in a direction perpendicular to said axes, and means for permitting rotation of the mounting portion about the first longitudinal axis of the guide portion 10. The adjustment means may be in the form of central slot 78 and slots 70 which engage with screws (56, fig 2). Securing means is also present for securing the guide portion in a fixed position relative to the mounting portion.

Description

Adjustable Whipstock

BACKGROUND

a. Field of the Invention

This invention relates to a whipstock assembly, and to mounting plates for use in a whipstock assembly, that permits adjustment of the position of a whipstock relative to a conductor stub.

Related Art When a production from an oil or gas well is no longer economic, or if there is some other problem with a production well, it is plugged and abandoned or decommissioned. If there are available well slots in the platform then a new well can be drilled. In many cases, however, all of the well slots in the platform are utilised.

Building a new platform is both costly and time consuming and, accordingly, it is often preferable to perform a slot recovery operation. Slot recovery involves reusing a non-producing well slot to drill a new production well, allowing a new well to be formed from an existing platform structure.

Slot recovery operations may involve the use of an above mudline whipstock to permit deflection of the new conductor. These whipstocks are often secured to the conductor stub of the abandoned non-producing well.

When drilling a new well it is important to be able to accurately control the positioning of the new conductor to avoid obstacles such as platform steelwork and other conductors. -2 -

It is an aim of the present invention to provide a whipstock that enables precise and controlled positioning of a new conductor.

SUMMARY OF THE INVENTION

According to a first aspect of the present invention there is provided a whipstock comprising: - a guide portion including deflection surfaces for deflecting a conductor, the guide portion having a first longitudinal axis; an elongate mounting portion configured to engage with a conductor stub, the mounting portion having a first end and a second end and a second longitudinal axis extending between said ends; - adjustment means configured to secure the mounting portion to the guide portion such that the first and second longitudinal axes are parallel to each other, the adjustment means comprising means for permitting movement of the second longitudinal axis away from and towards the first longitudinal axis in a direction perpendicular to said axes, and means for permitting rotation of the mounting portion about the first longitudinal axis of the guide portion; and securing means for securing the guide portion in a fixed position relative to the mounting portion.

The adjustment means therefore allows the position of the guide portion relative to the mounting portion to be changed to accommodate eccentricity of inner casings relative to the outer conductor casing of the conductor stub. In particular, the adjustment means allows the guide portion to accommodate any eccentricity while retaining the guide portion in the required orientation with respect to the conductor stub. The whipstock of the present invention will typically be an above mudline whipstock.

The adjustment means preferably comprises an adjustment member including a radial slot for receiving the first end of the mounting portion. The radial slot will -3 -typically be configured to permit linear movement of the mounting portion relative to the guide portion in a direction perpendicular to said longitudinal axes. The adjustment means may additionally or alternatively comprise an adjustment member including one or more circumferential slots. The one or more circumferential slots permit rotation of the mounting portion about the first longitudinal axis of the guide portion. In preferred embodiments the radial slot and the one or more circumferential slots are provided in a single adjustment member.

The adjustment member may be in the form of a disc-shaped plate that locates between the guide portion and the mounting portion of the whipstock. The adjustment member may include a plurality of circumferential slots surrounding a radial slot. The adjustment member will typically have opposing first and second faces, a distance between said faces defining a thickness of the member, and the or each circumferential slot will preferably extend through the full thickness of the plate. Additionally, the radial slot may also extend through the full thickness of the plate.

The securing means is preferably configured to secure the adjustment member to at least one of the guide portion and the mounting portion. In some embodiments the securing means has a first position in which the guide portion is movable relative to the mounting portion and a second position in which the guide portion is retained in a fixed position relative to the mounting portion. In these embodiments, with the securing means in the first position, the guide portion and the mounting portion can be moved relative to each other whilst remaining attached to each other via the adjustment means. Once the guide portion is in the required position relative to the mounting portion, the securing means can be moved to the second position to secure the guide portion to the mounting portion in a fixed position.

In some embodiments the adjustment means further comprises a securing plate attached to a first end of the guide portion. The securing means are preferably configured to extend through a part of the adjustment member to secure the adjustment member to the securing plate. In preferred embodiments the securing -4 -means extend through circumferential slot(s) in the adjustment member.

The securing plate will typically include a plurality of holes spaced apart around an edge region of said plate. These holes are preferably threaded and the securing 5 means comprises screws or bolts that engage with these holes.

In embodiments in which an adjustment member includes circumferential slots, each of the circumferential slots will be aligned with at least one of the holes of the securing plate when the adjustment plate is secured to the securing plate. At least one screw or bolt will, therefore, extend through each slot and engage with an aligned hole.

In preferred embodiments the mounting portion comprises a flange at the first end. In these embodiments the adjustment means comprises a slot for receiving the first end of the mounting portion and the slot includes a shoulder on which the flange is seated. Preferably the slot is provided in an adjustment member and a securing plate is provided attached to a first end of the guide portion. The securing means may then be configured to supply a force to clamp the flange between the shoulder of the adjustment member and the securing plate.

According to a second aspect of the present invention there is provided adjustment means for a whipstock, the whipstock having a guide portion including deflection surfaces for deflecting a conductor, the guide portion having a first longitudinal axis, and an elongate mounting portion configured to engage with a conductor stub, and the mounting portion having a first end and a second end and a second longitudinal axis extending between said ends, and the adjustment means being configured to secure the mounting portion to the guide portion such that the first and second longitudinal axes are parallel to each other, and the adjustment means comprising means for permitting movement of the second longitudinal axis away from and towards the first longitudinal axis in a direction perpendicular to said axes, and means for permitting rotation of the mounting portion about the first longitudinal axis of the guide portion. -5 -

The adjustment means preferably comprises an adjustment plate including a slot extending in a radial direction across said plate. In preferred embodiments the radial slot is sized to receive the first end of the mounting portion and a side wall of the radial slot includes a shoulder for engaging with a flange of the mounting portion.

The adjustment means preferably additionally comprises an adjustment plate including at least one curved slot extending in a circumferential direction. A single adjustment plate may be provided that includes both a radial slot and at least one circumferential slot.

According to a third aspect of the present invention there is provided a whipstock kit comprising: a guide portion including deflection surfaces for deflecting a conductor, the guide portion having a first longitudinal axis; at least two elongate mounting portions, each mounting portion being configured to engage with a conductor stub, each mounting portion having a first end and a second end and a second longitudinal axis extending between said 20 ends; at least one adjustment means configured to secure one of the mounting portions to the guide portion such that the first and second longitudinal axes are parallel to each other, the adjustment means comprising means for permitting movement of the second longitudinal axis away from and towards the first longitudinal axis in a direction perpendicular to said axes, and means for permitting rotation of the mounting portion about the first longitudinal axis of the guide portion; and securing means for securing the guide portion in a fixed position relative to the mounting portion, wherein each of the at least two mounting portions has a different external diameter for engaging a different diameter casing within said conductor stub. -6 -

Preferably the adjustment means comprises an adjustment member including a radial slot for receiving the first end of one of the mounting portions. The adjustment means preferably further comprises an adjustment member including one or more circumferential slots. A single adjustment member may be provided that includes both a radial slot and at least one circumferential slot.

In preferred embodiments a first end of each of the mounting portions may include a flange for engagement with said radial slot of the adjustment member.

In some embodiments the kit comprises at least two adjustment members, the radial slot of each of the adjustment members having different dimensions for receiving and engaging with a different one of said mounting portions.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be further described by way of example only and with reference to the accompanying drawings, in which: Figure 1 is an exploded perspective view of a whipstock according to a preferred embodiment of the present invention; Figure 2 is a partial cross-sectional view of the whipstock of Figure 1; Figure 3 is a cross-sectional view along the line B-B of Figure 2; Figure 4 is a cross-sectional view along the line A-A of Figure 2; Figure 5 is a side view of the assembled whipstock of Figure 1; and Figure 6 is a perspective view of the assembled whipstock of Figure 1 located in a conductor stub. -7 -

DETAILED DESCRIPTION

Figures 1, 2, 5 and 6 illustrate an adjustable whipstock 1 according to a preferred 5 embodiment of the present invention. The whipstock 1 is an above mudline whipstock which is designed to engage with a conductor stub 2 at a distance above the mudline, e.g. the sea bed.

During some slot recovery operations a decommissioned production well is cut off 10 at a distance above the mudline and the conductor and casings above this point are recovered. The whipstock 1 is engaged with the remaining conductor stub 2 in order to allow running of a second conductor.

Often the conductor casing 4 and the inner casing(s) 6 of the stub 2 at the point where the cut is made are not concentric. Traditionally any eccentricity in the casings has been accommodated by using an oversize whipstock. However, in some situations it is not possible to use a whipstock having a larger external diameter than the conductor stub. This may be due to surrounding framework and, in particular, due to a lack of diametrical clearance through conductor guides above the conductor stub.

Additionally, if there is minimal radial clearance around the stub 2 itself, it is important that the whipstock is mounted centrally on the conductor casing 4 to ensure that the new conductor can pass the whipstock 1 and stub 2.

The whipstock 1 of the present invention, therefore, permits radial and circumferential adjustment of the position of the whipstock relative to the conductor casing 4 and/or the inner casings 6 of the conductor stub 2. This allows a whipstock 1 to be used which has an external diameter no larger that the external diameter of the conductor casing 4 of the conductor stub 2.

The whipstock 1 comprises a lower, mounting portion or stab 8 and an upper, -8 -guide portion 10.

The stab 8 has a generally cylindrical tubular shape and extends between a first end 14 and a second end 16. A longitudinal axis 18 of the stab 8 extends between the first and second ends 14, 16, and a central bore 19 extends longitudinally through the stab 8. A length of the stab 8 between the first and second ends 14, 16 is typically about 2 m. A first end face 20 of the stab 8, at the first end 14, is perpendicular to the longitudinal axis 18, and a second end face 21 of the stab, at the second end 16, is sloped at an angle to the longitudinal axis 18. The first end 14 of the stab 8 includes a flange 22 that projects radially outwardly around the full circumference of the stab 8.

A plurality of barbs 24 are provided on an external surface 26 of the stab 8 between the first and second ends 14, 16. The barbs 24 are designed to engage with and secure the stab 8 to a casing 6 of the conductor stub 4. Typically the barbs 24 will be anti-rotation barbs, as is known in the art, to secure the stab 8 in a fixed position relative to the conductor stub 4.

The guide portion 10 also has a generally cylindrical tubular shape and extends between first and second ends 26, 28. A length of the guide portion 10 between the first and second ends 26, 28 is typically about 1.8 m. The first end 26 of the guide portion 10 is perpendicular to a longitudinal axis 30 of the guide portion 10. The guide portion 10 comprises a central longitudinal bore 32 surrounded by an inner tubular wall 34. An outer tubular wall 36 surrounds the inner tubular wall 34 such that a tubular cavity 35 is formed between the inner and outer walls 34, 36.

Guide plates 38 are attached to the second end of each of the inner and outer walls 34, 36 so that the guide plates 38 span the cavity 35 but do not cover the central bore 32. The guide plates 38 extend generally at an angle to the longitudinal axis 30 of the guide portion 10. Furthermore, the guide plates 38 are sloped towards each other so as to provide a generally V-shaped guide surface at the second end 28 of the guide portion 10. -9 -

The inner wall 34 includes J-shaped slots 40 for receiving lugs 42 of a running tool 44. Each of the slots 40 comprises at least a first part 46 extending longitudinally from the second end of the inner wall 34 and a second part 48 extending in a generally circumferential direction. In use, the running tool 44 is inserted into the central bore 32 of the guide portion 10 such that the lugs 42 engage in the slots 40. The running tool 44 can then be used to manoeuvre the whipstock 1 to the correct location.

The guide portion 10 is connected to the stab 8 by adjustment means that permits movement of the guide portion 10 relative to the stab 8 whilst ensuring that the longitudinal axis 30 of the guide portion 10 remains substantially parallel to the longitudinal axis 18 of the stab 8. In particular, the adjustment means is configured to permit movement of the guide portion 10 relative to the stab 8 in a direction such that the longitudinal axis 18 of the stab 8 moves away from and towards the longitudinal axis 30 of the guide portion 10 in a direction perpendicular to the axes 18, 30. The adjustment means also permits rotation of the stab 8 about the longitudinal axis 30 of the guide portion 10.

In this way, the stab 8 can be moved relative to the guide portion 10 such that 20 when the stab 8 is engaged with an inner casing 6 of the conductor stub 2 the guide portion 10 is aligned with, and is preferably co-axial with, the conductor casing 4.

In this embodiment the adjustment means comprises a securing plate 50 and an 25 adjustment member 12.

The securing plate 50 is attached to the first end 26 of the guide portion 10. Typically the securing plate 50 will be welded to the guide portion 10. The securing plate 50 is generally circular disc shaped having opposing first and second faces 51, 53 and a circumferential edge surface 55. The distance between the first and second faces 51, 53 defines a thickness of the securing plate 50. A diameter of the securing plate 50 is preferably equal to an external diameter of the -10 -guide portion 10 at its first end 26 such that when the securing plate 50 is attached to the guide portion 10 the edge surface 55 is continuous and flush with an external surface 62 of the guide portion 10.

The securing plate 50 includes a plurality of holes 52 located proximate the circumferential edge 54 of the plate 50, shown most clearly in Figure 3. The holes 52 are preferably equidistantly spaced around an edge region of the plate 50, and in this embodiment the securing plate 50 includes twelve holes. The holes 52 will typically be through-thickness holes and are threaded to receive securing screws or bolts 56.

In this embodiment the securing plate 50 further includes a central aperture 58 that provides a fluid passageway between the central bore 32 of the guide portion 10 and the central bore 19 of the stab 8 when the whipstock 1 is assembled.

A pair of longitudinally extending guide rails 60 is provided on the external surface 62 of the guide portion 10 proximate the lowest point of the guide plates 38, i.e. the end of the guide plates 38 nearest the first end 26 of the guide portion 10. The guide rails 60 extend in a direction towards the first end 26 and in this example the guide rails 60 extend over the circumferential surface 55 of the securing plate 50.

In use, these guide rails 60 aid in guiding the new conductor as it leaves the guide plates 38.

The adjustment plate or mounting plate 12 is generally circular disc shaped having opposing first and second faces 64, 66 and a circumferential edge surface 68.

The distance between the first and second faces 64, 66 defines a thickness of the adjustment plate 12. A diameter of the adjustment plate 12 is preferably equal to an external diameter of the guide portion 10 at its first end 26 and is, therefore, also equal to the diameter of the securing plate 50.

The adjustment plate 12 comprises a plurality of elongate slots 70 extending in a circumferential direction. The circumferential slots 70 are located proximate the circumferential edge 72 of the plate 12, as shown most clearly in Figure 4, and are curved to substantially match the curvature of the circumferential edge 72. The distance between the slots 70 and the circumferential edge 72 of the adjustment plate 12 is the same as the distance between the holes 52 and the circumferential edge 54 of the securing plate 50. In this way, when the whipstock 1 is assembled, at least some of the holes 52 are aligned with the slots 70.

The slots 70 are preferably equidistantly spaced around an edge region of the plate 12, and in this embodiment the adjustment plate 12 includes six slots 70.

The slots 70 are through-thickness slots and are sized to receive a part of the securing screws or bolts 56. In some embodiments the side walls of the slots 70 may include a shoulder such that a width of the slot 70 in a radial direction is smaller in a first region of the slot 70 proximate the first face 64 and is larger in a second region of the slot 70 proximate the second face 66. In these embodiments the dimensions of the slot 70 are such that a shaft 74 of the securing screw 56 is able to be inserted fully through the plate 12 while a head 76 of the screw 56 is held within the second region of the slot 70 and cannot pass fully through the plate 12. In other embodiments the width of the slots 70 in a radial direction is such that only the shaft 74 of the securing screw 56 can pass through and the head 76 of the screw 56 contacts the second face 66 of the adjustment plate 12 when the whipstock 1 is assembled.

The adjustment plate 12 further comprises a central slot 78. The slot 78 is typically elongate and the longer dimension of the slot 78 extends across the plate 12 in a radial direction. The side wall 80 of the slot 78 includes a shoulder 82 such that the dimensions of a first portion of the slot 78 proximate the first face 64 of the plate 12 are larger than the dimensions of the slot 78 in a second region proximate the second face 66 of the plate 12. In particular the dimensions of the slot 78 are such that the flange 22 of the stab 8 can be seated on the shoulder 82 with the stab 8 extending from the second face 66 of the plate 12.

The distance between the shoulder 82 and the first face 64 of the adjustment plate 12 is slightly less that the thickness of the flange 22, i.e. the distance between the first end face 20 of the stab 8 and an opposing press surface 84 of the flange 22. In this way, when the press surface 84 of the flange 22 is seated on the shoulder 82 of the adjustment plate 12 the first end face 20 of the stab 8 protrudes beyond the first face 64 of the adjustment plate 12.

To assemble the whipstock 1, the stab 8 is inserted through the central slot 78 of the adjustment plate 12 so that the press surface 84 of the flange 22 is seated on the shoulder 82. The adjustment plate 12 is then secured to the securing plate 50 by means of the securing screws 56 that extend through the slots 70 in the adjustment plate 12 and into the holes 52 in the securing plate 50.

Initially the attachment of the adjustment plate 12 to the securing plate 50 may be such that the adjustment plate 12 can be rotated with respect to the securing plate 15 50 and the stab 8 can be moved linearly between the two ends of the slot 78.

By moving the stab 8 in a radial direction with respect to the adjustment plate 12 the longitudinal axis 18 of the stab 8 can be offset from the longitudinal axis 30 of the guide portion 10. Additionally, by rotating the adjustment plate 12 with respect to the securing plate 50 the stab 8 may be rotated about the longitudinal axis 30 of the guide portion 10. In particular, with an end of each of the screws 56 secured in the holes 52 of the securing plate 50, the adjustment plate 12 may be rotated such that a part of the shaft 74 of each of the screws 56 moves along the length of each of the circumferential slots 70.

The stab 8 can, therefore, be secured in a range of positions with respect to the guide portion 10 to allow for any eccentricity of the casings 6 into which the stab 8 will be inserted while locating the guide portion 10 co-axially with the conductor casing 4 of the stub 2.

Once the stab 8 is in the required position with respect to the guide portion 10, the securing screws 56 may be tightened such that sufficient force is applied between -13 -the adjustment plate 12 and the securing plate 50 to prevent rotation of the adjustment plate 12 relative to the securing plate 50. Furthermore, because the first end face 20 of the stab 8 protrudes beyond the first face 64 of the adjustment plate 12, the force applied by the securing screws 56 causes the first end face 20 of the stab 8 to be pushed against the first face 51 of the securing plate 50. This clamping force applied to the flange 22 by the shoulder 82 of the adjustment plate 12 and the first face 51of the securing plate 50 means that the stab 8 is held in a fixed position with respect to the guide portion 10.

In some embodiments the position of the stab 8 relative to the guide portion may be determined and set before the securing screws 56 are inserted through the slots 70 and into the holes 52.

Once the whipstock 1 has been assembled the stab 8 is inserted into the conductor stub 2 until the second face 66 of the adjustment plate 12 contacts an upper edge or cut surface of the conductor stub 2, as illustrated in Figure 6.

In order to permit the whipstock 1 to be engaged with one of a variety of sizes of casing 6 within the conductor stub 2, a number of different adjustment plates 12 and stabs Bare attachable to the guide portion 10. In particular, each stab in a set of stabs 8 will have a different external diameter. A corresponding adjustment plate 12 will have a central aperture 78 of appropriate dimensions to receive the first end 14 and flange 20 of the stab 8 as described above. The outer diameter of the adjustment plate 12 and the position of the circumferential slots 70 will be the same for all of the adjustment plates 12 so that these mate correctly with the guide portion 10 and securing plate 50.

In some embodiments it may be desirable to use the same adjustment plate 12 for all sizes of stab 8. In these embodiments the diameter of the stab 8 may vary, but 30 the external diameter of the flange 20 remains the same such that the flange will always seat on the shoulder 82 of the adjustment plate 12.

-14 -In a preferred embodiment of the invention an external diameter of the guide portion 10 is about 24" (0.6 m), the diameter of a first stab 8 is designed to engage with a casing having a diameter of 16" (0.4 m) and the diameter of a second stab 8 is designed to engage with a casing having a diameter of 10.75" (0.27 m).

Typically all of the components of the whipstock 1, for example the guide portion 10, stab 8, securing plate 50 and adjustment plate 12, are made from a suitable structural steel. In preferred embodiment the steel is an S355J2 grade steel.

The present invention therefore provides a whipstock and, in particular, an adjustment plate for a whipstock, that can accommodate eccentricity in the casings of a conductor stub and enables accurate alignment of a guide portion of the whipstock with the conductor stub.

Claims (23)

  1. -15 -CLAIMS1. A whipstock comprising: a guide portion including deflection surfaces for deflecting a conductor, the guide portion having a first longitudinal axis; an elongate mounting portion configured to engage with a conductor stub, the mounting portion having a first end and a second end and a second longitudinal axis extending between said ends; adjustment means configured to secure the mounting portion to the guide portion such that the first and second longitudinal axes are parallel to each other, the adjustment means comprising means for permitting movement of the second longitudinal axis away from and towards the first longitudinal axis in a direction perpendicular to said axes, and means for permitting rotation of the mounting portion about the first longitudinal axis of the guide portion; and securing means for securing the guide portion in a fixed position relative to the mounting portion.
  2. 2. A whipstock as claimed in Claim 1, wherein the adjustment means comprises an adjustment member including a radial slot for receiving the first end of the mounting portion, the radial slot permitting linear movement of the mounting portion relative to the guide portion in a direction perpendicular to said longitudinal axes.
  3. 3. A whipstock as claimed in Claim 1 or Claim 2, wherein the adjustment 25 means comprises an adjustment member including one or more circumferential slots, the one or more circumferential slots permitting rotation of the mounting portion about the first longitudinal axis of the guide portion.
  4. 4. A whipstock as claimed in Claim 2 or Claim 3, wherein the securing means is configured to secure the adjustment member to at least one of the guide portion and the mounting portion.
  5. 5. A whipstock as claimed in Claim 3, wherein the adjustment means further comprises a securing plate attached to a first end of the guide portion and wherein the securing means extend through the circumferential slot(s) of the adjustment member to secure the adjustment member to the securing plate.
  6. 6. A whipstock as claimed in Claim 5, wherein the securing plate includes a plurality of holes spaced apart around an edge region of said plate.
  7. 7. A whipstock as claimed in Claim 6, wherein each of the circumferential slots is aligned with at least one of the holes of the securing plate when the adjustment plate is secured to the securing plate.
  8. 8. A whipstock as claimed in Claim 7, wherein the securing means are screws or bolts and the holes in the securing plate are threaded, and said screws or bolts extend through said slots and are engaged in said holes.
  9. 9. A whipstock as claimed in any preceding claim, wherein the securing means have a first position in which the guide portion is movable relative to the mounting portion and a second position in which the guide portion is retained in a fixed position relative to the mounting portion.
  10. 10. A whipstock as claimed in any preceding claim, wherein the mounting portion comprises a flange at the first end and the adjustment means comprises a slot for receiving said first end of the mounting portion, and wherein said slot includes a shoulder on which the flange is seated.
  11. 11. A whipstock as claimed in Claim 10, wherein the adjustment means comprises an adjustment member including said slot for receiving the first end of the mounting portion and a securing plate attached to a first end of the guide portion, and wherein the securing means is configured to supply a force to clamp the flange between the shoulder of the adjustment member and the securing plate.
  12. 12. A whipstock as claimed in any preceding claim, wherein the whipstock is an above mudline whipstock.
  13. 13. Adjustment means for a whipstock, the whipstock having a guide portion including deflection surfaces for deflecting a conductor, the guide portion having a first longitudinal axis, and an elongate mounting portion configured to engage with a conductor stub, the mounting portion having a first end and a second end and a second longitudinal axis extending between said ends, and the adjustment means being configured to secure the mounting portion to the guide portion such that the first and second longitudinal axes are parallel to each other, and the adjustment means comprising means for permitting movement of the second longitudinal axis away from and towards the first longitudinal axis in a direction perpendicular to said axes, and means for permitting rotation of the mounting portion about the first longitudinal axis of the guide portion.
  14. 14. Adjustment means as claimed in Claim 13, wherein the adjustment means comprises an adjustment plate including a slot extending in a radial direction across said plate.
  15. 15. Adjustment means as claimed in Claim 14, wherein said radial slot is sized to receive the first end of said mounting portion and a side wall of said radial slot includes a shoulder for engaging with a flange of said mounting portion.
  16. 16. Adjustment means as claimed in any one of Claims 13 to 15, wherein the adjustment means comprises an adjustment plate including at least one curved slot extending in a circumferential direction.
  17. 17. A whipstock kit comprising: a guide portion including deflection surfaces for deflecting a conductor, the guide portion having a first longitudinal axis; at least two elongate mounting portions, each mounting portion being -18 -configured to engage with a conductor stub, each mounting portion having a first end and a second end and a second longitudinal axis extending between said ends; at least one adjustment means configured to secure one of the mounting portions to the guide portion such that the first and second longitudinal axes are parallel to each other, the adjustment means comprising means for permitting movement of the second longitudinal axis away from and towards the first longitudinal axis in a direction perpendicular to said axes, and means for permitting rotation of the mounting portion about the first longitudinal axis of the guide portion; and securing means for securing the guide portion in a fixed position relative to the mounting portion, wherein each of the at least two mounting portions has a different external diameter for engaging a different diameter casing within said conductor stub.
  18. 18. A whipstock kit as claimed in Claim 17, wherein the adjustment means comprises an adjustment member including a radial slot for receiving the first end of one of the mounting portions and one or more circumferential slots.
  19. 19. A whipstock kit as claimed in Claim 18, wherein a first end of each of the mounting portions includes a flange for engagement with said radial slot of the adjustment member.
  20. 20. A whipstock kit as claimed in Claim 18 or Claim 19, the kit comprising at least two adjustment members, the radial slot of each of the adjustment members having different dimensions for receiving and engaging with a different one of said mounting portions.
  21. 21. A whipstock substantially as herein described with reference to or as shown in the accompanying drawings.
  22. 22. Adjustment means for a whipstock substantially as herein described with -19 -reference to or as shown in Figures1, 2 and 4.
  23. 23. A whipstock kit substantially as herein described with reference to the accompanying drawings.
GB1422070.1A 2014-12-11 2014-12-11 Adjustable whipstock Withdrawn GB2533143A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1422070.1A GB2533143A (en) 2014-12-11 2014-12-11 Adjustable whipstock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1422070.1A GB2533143A (en) 2014-12-11 2014-12-11 Adjustable whipstock

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GB2533143A true GB2533143A (en) 2016-06-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2018742B1 (en) * 2017-04-19 2018-10-29 Nicolaas Rudolf Antonius Kampman Roelof Well recovery assembly for recovering a well and method for well recovery

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030037930A1 (en) * 2001-08-23 2003-02-27 Weatherford/Lamb, Inc. Orienting whipstock seat, and method for seating a whipstock
US20140216760A1 (en) * 2013-02-06 2014-08-07 Halliburton Energy Services, Inc. Systems and Methods for Rotationally Orienting a Whipstock Assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030037930A1 (en) * 2001-08-23 2003-02-27 Weatherford/Lamb, Inc. Orienting whipstock seat, and method for seating a whipstock
US20140216760A1 (en) * 2013-02-06 2014-08-07 Halliburton Energy Services, Inc. Systems and Methods for Rotationally Orienting a Whipstock Assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2018742B1 (en) * 2017-04-19 2018-10-29 Nicolaas Rudolf Antonius Kampman Roelof Well recovery assembly for recovering a well and method for well recovery

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