- Title : Drilling Practices Manual by Preston L. Moore
- Publish : Peen Well Book Tulsa. Oklahoma USA
- Type Document : pdf
- Release : December 1986
- Total Page : 604 Page
- Size : 24.75 Mb
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Decrypted Contents
DEPTH LIMITATION
After the requirements mentioned above are determined, establish your own minimum standards for the rig, commonly referred to as "depth rating." Unfortunately, there is no real standard for depth rating, so much of the term's meaning is lost. This necessitates an analysis by the planner to establish rating standards for the case at hand. Table 1-1 shows criteria for determining depth limitation.
After the requirements mentioned above are determined, establish your own minimum standards for the rig, commonly referred to as "depth rating." Unfortunately, there is no real standard for depth rating, so much of the term's meaning is lost. This necessitates an analysis by the planner to establish rating standards for the case at hand. Table 1-1 shows criteria for determining depth limitation.
Derrick and Mast
Derrick or mast ratings are made from the maximum hookload capacity. Know under what conditions these ratings were made when comparing them. For instance, a rating may be valid only with a certain type of crownI traveling-block line configuration. In addition, double check the credibility of the rating if it is attached to a non-namebrand mast. If there is some doubt, an API-certified inspector should verify all ratings. Other factors to consider with mast rating are leg loading, substructure rating, and maximum wind loading with drillpipe in the derrick.
In the context of rig selection, mast rating figures are needed to determine if the rig will be adequate under the maximum loading condition anticipated during drilling. This condition typically occurs while running the heaviest string of casing, so calculation of the maximum string weight is the first step in analyzing mast load. To illustrate what occurs during mast loading, consider first the simplest of cases, demonstrated in Fig. 1-1. In this case, a 100-1b load is being lifted with a pulley. Total load on the derrick is 200 lb because the two lines are each exerting a downward force of 100 lb. Fig. 1-2 shows the
familiar block and tackle system employed to lift the same 100 lb.
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