Wireline Services
1 SURFACE EQUIPMENT FOR WIRELINE:
To enable downhole wireline operations to be performed, equipment must be provided at surface to allow the following:-
(a) The lowering and retrieval of the tool string to the work location.
(b) Monitoring of tool position and cable tension.
(c) Handling and alignment pulleys so that the tool string can be positioned vertically above the well for lowering through the Xmas tree and into the tubing string.
(d) The ability to insert the tool string into the live well and to prevent pressure from escaping.
(e) A blowout preventor which will seal off the annulus around the cable and if required cut the wireline
1.1 Wireline
Conventional wireline or “slick wireline” as it is frequently referred to, utilises a single strand high tensile wire.
The wire is normally made from high tensile steel.
Minimum diameter of cable to be used, which is desirable for the following reasons:-
(1) It reduces the total weight of the wireline itself.
(2) It is more pliable and can be bent over smaller diameter sheaves and drum reels.
(3) It minimises the upwards pressure force on the tool string due to the difference in plain end areas at the top and bottom of the tool string.
Normally 50% of the maximum breaking strength is used as a working limit. In some environments where H5S may be present, the high tensile steel will be very susceptible to hydrogen embrittlement and it may be necessary to add an additional safety factor, in that case, a low tensile steel is used with a lower breaking strength.
In cases where a higher breaking strength is required it is possible to use braided cables which are available in sizes of 1/8", 9/64", 3/16" and 1/4".
Single strand wireline is available in a range of lengths: 10000, 12000, 15000,
18000, 20000 and 25000 ft.
The wireline is normally wound onto a reel on a self contained skid which has its own power supply for drum rotation and creating
To enable downhole wireline operations to be performed, equipment must be provided at surface to allow the following:-
(a) The lowering and retrieval of the tool string to the work location.
(b) Monitoring of tool position and cable tension.
(c) Handling and alignment pulleys so that the tool string can be positioned vertically above the well for lowering through the Xmas tree and into the tubing string.
(d) The ability to insert the tool string into the live well and to prevent pressure from escaping.
(e) A blowout preventor which will seal off the annulus around the cable and if required cut the wireline
1.1 Wireline
Conventional wireline or “slick wireline” as it is frequently referred to, utilises a single strand high tensile wire.
The wire is normally made from high tensile steel.
Minimum diameter of cable to be used, which is desirable for the following reasons:-
(1) It reduces the total weight of the wireline itself.
(2) It is more pliable and can be bent over smaller diameter sheaves and drum reels.
(3) It minimises the upwards pressure force on the tool string due to the difference in plain end areas at the top and bottom of the tool string.
Normally 50% of the maximum breaking strength is used as a working limit. In some environments where H5S may be present, the high tensile steel will be very susceptible to hydrogen embrittlement and it may be necessary to add an additional safety factor, in that case, a low tensile steel is used with a lower breaking strength.
In cases where a higher breaking strength is required it is possible to use braided cables which are available in sizes of 1/8", 9/64", 3/16" and 1/4".
Single strand wireline is available in a range of lengths: 10000, 12000, 15000,
18000, 20000 and 25000 ft.
The wireline is normally wound onto a reel on a self contained skid which has its own power supply for drum rotation and creating