The Cement Programme gives a brief explanation as to the objectives in setting casing, i.e.: isolate hydrocarbons isolate different pressure regimes provide a pressure conduit of full integrity for drilling and completion allow installation of BOP, completion etc. General Preparation Guidelines The following guidelines should be applied to the preparation of the Cement Programme: The … Cement Programme Preparation
This article presents the key elements for Cement Bond Log Interpretation (free pipe, good bond, hard formation, micro annulus) Free Pipe Free Pipe is characterised by the following: CBL / VDL CET High CBL readings > 50% White on log Parallel lines on VDL vs. Depth CSMX* & CSMN* are zero Weak formation signals … Cement Evaluation – Cement Bond Log Interpretation
This article describes how Cement Bond Logs are used to interpret the quality of the cement bond. The Cement Bond Logs (CBL) gives a continuous measurement of the amplitude of the first casing arrival at a receiver spaced 3 ft from an acoustic transmitter. The amplitude is a maximum in unsupported pipe, and a minimum for … Cement Evaluation – Cement Bond Logs (CBL)
Circulate casing and condition mud. a minimum of 150 % of the casing contents must be circulated. Carry out circulation test to assess displacement rates, carefully monitor for losses. Drop first bottom plug (optional) and pump preflush. if a problem occurs which cannot be fixed in less than 20 minutes, the preflush must be circulated … Single Stage (Plug Type) Casing Cementation Procedure
For offshore cementation of the 20in surface conductor, the following procedures shall be used for inner string cementation: Make up stab-in sub and centraliser and rih on 5in drillpipe. Stab stinger into the float shoe and engage the cementing tool to the casing head housing. Fill drillpipe and check for any returns from inside casing … Inner String (Stinger) Casing Cementation Procedure
1. RUN drillpipe with a stinger of tubing to the planned depth of the bottom of the plug. Note: * The stinger should have side jets and should be at least 100 ft longer than the planned cement plug. Use 3.1/2in or smaller tubing in holes with a diameter of 12.1/4in or less. * The … Procedure for Setting Balanced Plugs
General Guidelines for Setting Cement Plugs (job design, volume and excess Requirements, slurry requirements) Job Design In deviated wells (deviation > 30 °, a solid base should be provided for the cement plug (bridge plug or a highly viscous and pumpable pill). In potential loss zones, it is better to set abandonment cement plugs in … Guidelines for Design of Cement Plugs
The additives to be used and their concentration shall be decided by the Cement Contractor, after testing the slurry using representative samples of cement, additives and mixwater despatched from the rig. This has to be then approved by the Operations Engineer and Superintendent. No deviationfrom the recipe, as determined by the Cementing Contractor is permitted … Cement Additives (function and definition)
1. Make up 260m of 2 3/8″, 6.65 lb/ft TBG cement stinger with mule shoe. 2. R.I.H. stinger on 3 1/2″ drill pipe,circulate last18m down to bottom (3250m). 3. Cement Company: Rig up lines and pressure test to 200 bar. 4. Cment Company: Batch mix cmt. and spacers. Volumes required: SLURRY: 7646 ltrs cmt slurry. … 5 7/8″ hole balanced cement plug programme example