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CA-3109211-C - METHOD AND DEVICE FOR SUPPLYING LIQUID TO A LINER

CA3109211CCA 3109211 CCA3109211 CCA 3109211CCA-3109211-C

Abstract

A method is described for supply of liquid from a liquid storage to a casing string (10,12, 14..) which from a deck (16) on an installation is conveyed down in a well with the help of a pipe handler comprising an elevator, where the liquid is supplied via an uppermost casing (10) which is added to the casing string, and the liquid is supplied through a filling pipe (30) via an outlet nozzle (36) to the top of the casing (10) already during the pipe's (10) screwing into the casing string (10, 12, 14..) where the filling pipe is extended during the liquid supply until the casing string is being lowered down to a position where it is securely locked to the deck (16), and liquid is added to a suitable level in the casing string. The method is characterised in that the filling pipe (30) is extended in that it comprises a telescopic axially moveable pipe end part (35) with a constricted outlet (36) which leads to the pipe end part (35) being pushed axially outwards and extends the filling pipe (30) when the liquid is supplied under pressure, and the pipe end part (35) is pushed outwards under the counter effect of a prestressing force, and pulled back under the influence of said prestressing force when the liquid supply stops. Also described is a device as given in claim 10.

Inventors

  • Helge Hope
  • Alf Breivik

Assignees

  • MOONSHINE SOLUTIONS AS

Dates

Publication Date
20260505
Application Date
20180815

Claims (17)

  1. 13 CLAIMS. 1. Method for supply of liquid from a liquid storage to a casing string which from a deck on an installation is conveyed down in a well with the help of a pipe handler comprising an elevator, where the liquid is supplied via an uppermost casing which is added to the casing 5 string, and the liquid is supplied via a filling pipe to the top of the casing already during screwing of the pipe into the casing string where the filling pipe is extended during the liquid supply until the casing string is lowered down into a position where it is locked to the deck, and there is added liquid to a suitable level in the casing string, characterized in that the filling pipe comprises a telescopically, axially moveable pipe end part with a 10 constricted outlet which leads to the pipe end part being pushed axially outwards and extends the filling pipe when the liquid is supplied under pressure, and the pipe end part is pushed outwards under the counter effect of a prestressing force, and is pulled back under influence of said prestressing force when the liquid supply stops.
  2. 2. Method according to claim 1, characterized in that the prestressing force is provided 15 in that the pipe end part is connected with the filling pipe by a spring that is clamped together when the pipe end part is extended when the liquid is supplied under pressure, and the spring contributes to pull the pipe end part back to the initial position when the liquid pressure ceases.
  3. 3. Method according to claim 1, characterized in that the prestressing force is provided 20 in that the filling pipe and the pipe end part between themselves define a closed gas-filled volume which is compressed when the pipe end part is pushed forwards as a consequence of the increased liquid pressure, and the pipe end part is returned as a consequence of gas expansion when the liquid pressure decreases.
  4. 4. Method according to claim 1, characterized in that the prestressing force is provided 25 in that the filling pipe and the pipe end part are mutually connected by an elastic body that is stretched and tensioned when the pipe end part is pushed forwards as a consequence of the increased liquid pressure, and the pipe end part returns the elastic body when the liquid pressure decreases.
  5. 5. Method according to claim 4, characterized in that an elastic band is used as elastic 30 body. Date Re9ue/Date Received 2024-01-18 14
  6. 6. Method according to claim 1, characterised in that the applied constricted outlet comprises a valve which switches the liquid inflow between a full outflow and a minimum outflow.
  7. 7. Method according to claim 6, characterized in that the valve switches to a closed 5 position with its minimum opening when the pipes are pulled together telescopically, and to full opening when the pipes are pushed out.
  8. 8. Method according to any one of claim 6 or claim 7, characterized in that the minimum outflow is provided by a through-running channel in the valve, which is permanently open for liquid flow. IO
  9. 9. Method according to any one of claims 1 to 8, characterized in that the filling pipe is screwed into coupling threads of a saver sub and is set up between downwardly extending struts of the elevator, so that the constricted outlet is lying above or adjoining a locking collar which locks onto each new casing section that is fitted in the casing string.
  10. 10. Device for filling pipe for delivery of liquid to a casing in a well in connection to an 15 installation, where a pipe end part of the filling pipe is telescopically extendable and can be pushed outwards during liquid supply and then withdrawn, characterized in that the pipe end part comprises a constricted outlet suited to during filling of liquid to set up an overpressure in the liquid in the filling pipe to generate said extension, and the pipe end part and the filling pipe are mutually connected with a body that is 20 prestressed during the extension of the pipe end part, and which can pull the pipe end part back.
  11. 11. Device according to claim 10, characterized in that the prestressing body comprises a spring connecting the pipe end part with a permanent inner pipe part.
  12. 12. Device according to claim 10, characterized in that the prestressing body is a defined 25 closed chamber/ volume (V9as) between the filling pipe and the pipe end part, and the defined closed chamber/ volume (V9as) is filled with gas and set up to be compressed when the pipe end part is pushed forwards as a consequence of the increased liquid pressure, and to be pulled back as a consequence of gas expansion when the liquid pressure decreases.
  13. 13. Device according to claim 10, characterized in that the prestressing body is an elastic 30 body which mutually connects the filling pipe and the pipe end part, said body is stretched and tensioned when the pipe end part is pushed forwards as a consequence of the Date Re9ue/Date Received 2024-01-18 increased liquid pressure, and the pipe end part is pulled back by the elastic body when the liquid pressure decreases.
  14. 14. Device according to any one of claims 11-13, characterized in that the filling pipe comprises the permanent inner pipe part that carries an externally lying manually 5 displaceable and fixable axial pipe part, and an outer pipe end part which is connected to the fixable axial pipe part.
  15. 15. Device according to claim 14, characterized in that the outer pipe end part comprises a throttle valve that can be reset to a closing position and to an open position for liquid outflow. IO
  16. 16. Device according to claim 15, characterized in that a minimum outflow is provided by a channel that runs through the throttle valve, which is permanently open for liquid flow.
  17. 17. Device according to any one of claims 10-16, characterized in that the filling pipe is connected to a pipe handler elevator with a flexible bellows. Date Re9ue/Date Received 2024-01-18

Description

1 METHOD AND DEVICE FOR SUPPLYING LIQUID TO A LINER Field of the Invention PCT/NO2018/050210 The present invention relates to a method for supply of liquid from a liquid storage to a casing 5 string which from a deck on an installation is submersed into a well with the help of a pipe handler comprising an elevator, where the liquid is supplied via an uppermost casing that is added to the casing string, and the liquid is supplied through a filling pipe via an outlet nozzle to the top of the casing already during the screwing into the casing string where the filling pipe is extended during the liquid supply up to when the casing string is being submersed to a position where it is securely 10 locked to the deck, and liquid is supplied to an adequate level in the casing string. The invention also relates to a device for a filling pipe for delivery of liquid through an outlet nozzle to a casing string in a well in connection with an installation, where the pipe end part of the filling pipe is telescopically extend able and can be pushed outwards during the delivery of the liquid and 15 thereafter pulled back. In particular, the invention relates to a device for supply of drilling liquid from a storage on an oil installation to a casing which is about to be installed section by section to a casing string in a drilled well in a fluid-carrying formation in the sub-terrain. Background of the invention 20 There are strict regulations that drilling operations shall be safe and efficient. Operations that are carried out at and around a drilling deck are always subjected to continuous improvements. In all areas, including the Norwegian continental shelf, all activities are logged in detail and analysed down to seconds. From this analysis, statistical reports are generated that are used in the dialogue between land-based organisations and offshore organisations to improve 25 the quality of the operations at all levels. It has been found that some operations are inappropriately more time consuming than necessary. This applies for instance to the process of filling of casing pipes during commissioning. Today, it is known to supply drilling liquid to casings directly through the drill's "saver sub". This takes place 30 when the top of the casing, or the length of joined sections of casings, stands unattached to the drilling deck, i.e. temporarily locked with the help of slips. As a consequence of the casing being Date Re9ue/Date Received 2024-01-18 WO 2020/036491 PCT /NO2018/050210 2 unattached, the Top Drive with the "elevator'' is free and one can lower the Top Drive with the saver sub as close to the top of the casing as one wishes. One avoids spillages as the "saver sub" can be brought much nearer to the top of 5 the casing. Such filling of casings takes place at given intervals, for example for every time 5-20 pipe lengths are inserted, so that the hydrostatic pressure difference internally and externally down in the well shall not be too large. Casings are led into the well with a tight pipe in the bottom, and therefore no liquid will flow in from the bottom of the casing. The top of the casing is filled with air during commissioning, 10 while one has a liquid at the outside. This leads to a pressure difference between the inside and the outside, something that is evened when a casing is filled up with a fluid. Description of prior art 15 With regard to prior art, reference is made to a solution outlined, where a so-called Casing Running Tool is outlined by National Oilwell Varco, and also a "Single valve" appliance for the filling of casings and for circulation equipment, described in the patent US 6,173,777. 20 These known methods also consider other problems than those related to the present invention. According to the first mentioned solution one can both rotate the casing and circulate liquid through it, while US 6,173,777 primarily relates to circulation of liquid through the casing. For both known methods are then the casings filled with a liquid. Reference is also made to the following patents: International application WO 98/50672, US patents US 5,682,952, US 5,191,939, US 2012/0048574, US 2010/0012324, US 2010/0206584 and also US 2015/0300107. 30 Of these, WO 98/50672 and US 5,682,952 are the closest to the present invention. The former mentions that driving the extendable pipe forwards and back takes place by a screw function. US 5,682,952 describes that there is a separate liquid under pressure that shall push 35 the pipe forwards, as a telescopic spring-prestressed filling pipe is described where the telescopic housing is connected to a liquid storage via a pipeline. Pressure liquid supplied to the telescopic housing contributes to the telescope part being pushed out WO 2020/036491 PCT /NO2018/050210 3 and extended. Therefore, this pressure system is separate from the system that supplies liquid through the pipe itself. Thus, the solution in these variants in these two patents are completely different fro