Drilling

Responsibilities during Fishing Operations

Responsibilities of the Company Drilling Supervisor, Specialist Contractor Engineer, Drilling Contractor Toolpusher, during fishing operations. Company Drilling Supervisor: The overall responsibility and supervision of all non-standard operations rests with the Company Drilling Supervisor. He shall also ensure that fishing equipment is available on site for all non-standard equipment run in the hole. Drilling Contractor Toolpusher: … Responsibilities during Fishing Operations

Underreaming

Underreaming procedures vary from tool to tool. However, it shall be verified that: the tool is function tested with the mud pumps on surface before running in the cutters are secured inside the tool body with a small piece of rope or tape to ensure a safe trip in the hole without damage to the … Underreaming

Fishing Tools: Drilling/ Fishing Jars,Accelerators, Bumper Subs

This article describes force multiplying fishing tools: Jars, Accelerators, Bumper Subs. Drilling/ Fishing Jars If a fishing specialist contractor is used, the contractor should be consulted on a case by case basis for the optimum selection and placement of jars. Accelerators A gas-charged (N2) accelerator or “intensifier” may be run to greatly increase the effectiveness … Fishing Tools: Drilling/ Fishing Jars,Accelerators, Bumper Subs

Fishing Planning and Preparation

When equipment has been lost or is stuck in the hole, the following points shall be considered in deciding the optimum course of action: The type of equipment in the hole to be fished (drillpipe, collars, junk bit cones etc). The condition of the hole/mud. Will formation instability cause the hole to deteriorate ? Is … Fishing Planning and Preparation

Fishing tools selection

The table below presents the types of fishing tools and their applications Type of Fishing Job Type of Fishing Tool Names of Tools Recovery of Tubular Fish Connecting Tools -External Catch -Internal Catch -Accessories         Washover Tools     Force Multiplier   Overshot Die collar Taper tap (poor class of tool: overshot … Fishing tools selection

General Guidelines for Sidetracking

The main requirement in sidetracking a well is the development of a lateral force to allow the bit to cut on the side of the hole. BHA Geometry The required lateral force shall be provided by the geometry of the BHA. The most effective BHA configuration to achieve a successful sidetrack kick-off is a mud … General Guidelines for Sidetracking

Miscellaneous Fishing Tools

This article describes the following fishing tools: Magnets,  Lead Impression Blocks, Rope Spears, Taper Taps and Die Collars. Magnets The following guidelines should be used when using magnets: The force of some magnets decreases with the age of the magnet. For this reason, when the magnet is not in use, the cover plate on the … Miscellaneous Fishing Tools

Fishing with Junk Subs

Junk subs are constructed with rib guides which are welded to the main body. These guides assist in preventing the cup from becoming crushed and guide the tool. Junk subs are available in various lengths. Guidelines The following guidelines shall be used when running junk subs: The mud stream agitates the junk and causes it … Fishing with Junk Subs

Fishing with Washover Strings

Washover strings can be used when: the formation has bridged off and stuck the string. the string has become cemented in the hole. dressing the top of the fish for latching on with an overshot. milling over stuck packers milling over stabilisers and reamers. Feasibility Consideration shall be given to the cost of the washover … Fishing with Washover Strings

Fishing with Spears

Recommendations to be used when fishing with a spear: Spears shall be dressed with a pack-off rubber to circulate when required. A stop ring or stop sub shall be used to prevent the spear from entering too deeply into the fish, to provide the ability to re-set the jars, and to enable easier release of … Fishing with Spears