The following 2 types of Junk retrievers are discussed in this article: Coring Type Basket and Reverse Circulation Junk Basket or Jet Retriever. Coring Type Basket The coring type basket cuts a short core. As the core is being cut, junk is forced into the barrel of the tool. The following procedure shall be used: … Fishing with Junk Retrievers
A Measurement While Drilling (MWD) tool is a combined magnetic steering and surveying instrument run near the bottom of the BHA. It accurately measures azimuth and inclination as well as toolface. Measurement While Drilling (MWD) has an advantage over a steering tool in that no wireline is required inside the drillpipe since an electric power … Measurement While Drilling (MWD) Tool
Best practices for running a recoverable surveying instrument: the time drillstring is set on slips shall be minimised. The pipe should be picked up on elevators as soon as possible after making connection and inserting survey instrument in pipe the pipe shall be continuously reciprocated while running and retrieving the survey instrument the pipe shall … Best Practices for Running Recoverable Survey Instruments
Surveying guidelines for wells with no potential well control problems. In Exploration, Appraisal or Development wells hole sections, where mobile hydrocarbons are not present or potential well control problems can be discounted, TOTCO surveys shall be taken at a frequency not to exceed 500 ft and on trips for bits with Magnetic Multi-Shots taken at … Surveying Wells with No Anticipated Well Control Problems
The chemical cutter is a tool designed to cut and allow retrieval of stuck tubing or drillpipe in a well. The primary advantages of this tool over explosive methods are its ability to sever tubing without causing the following undesirable problems: damaging the well casing or adjacent tubing enlarging or leaving a burr on the … Chemical Cutters for Stuck Tubing or Drillpipe
When running a magnetic surveying instrument, the following guidelines shoud be adhered to: to eliminate external magnetic interference, surveys shall not be taken within 30 ft of a casing shoe all surveys should be corrected to grid co-ordinates all surveys must be read carefully and double-checked Note: A check survey shall be run if doubt … Introduction to Magnetic Surveys
The following best practices should be considered for fishing operations: All fishing tool details shall be recorded on a drawing prior to running the tool. In particular, the safe working load for all fishing tools and associated equipment shall be determined. Internal diameters of fishing tools to be run shall be checked to verify that … Fishing Guidelines
Good drilling practices, particularly with regard to circulating and tripping activities, can greatly reduce the occurrence of stuck pip. Stuck Pipe Procedures Drilling Contractor personnel must be made aware of the tight hole and stuck pipe procedures and the Drillers have been informed of the correct action to take in the event of tight hole … Stuck Pipe Prevention
After effort has been put into freeing the pipe the decision has to be made whether to back off or continue. There are two options to consider: 1. Back off above the free point and run in with a fishing assembly. 2. Back off above the free point, plugback and side-track The decision to back … When to Give Up Attempts to Free the Pipe
QA/QC Instrument Tests to be performed for Gyro Surveys. 1. Inclination Values (In-run and Out-run) The variance between the in-run and out-run inclination values for survey data from the same survey station shall not exceed 0.23 deg. Note: A minimum of 10 survey stations shall be compared. 2. Azimuth Values (In-run and Out-run) Stations with … Gyro Surveys – QA/QC