Download e-book for iPad: Directional Drilling (Petroleum Engineering and Development by Tom Inglis
By Tom Inglis
A few 35 years in the past i used to be a little bit precariously balanced in a drilling derrick aligning a whipstock right into a directional gap in North Holland via the Stokenbury procedure, and doubtless considering to myself that i used to be on the very leading edge of expertise. throughout the intervening interval it has develop into seen to many people that the most major technical advances within the oil enterprise were made in drilling, and especially within the fields of offshore and directional drilling. It has additionally turn into obvious that the standard of the technical literature describing those advances has no longer stored speed with that of the advances themselves frequently. a specific evident instance of this has been within the box of directional drilling the place a wide literature hole has existed for a few years. i'm thrilled to work out this hole now full of the current quantity through my pal Tom Inglis. certainly it is just after examining his entire booklet that I fully grasp the level of my very own lack of understanding of the newest suggestions of directional drilling and the way fascinating it was once to have an authoritative textual content at the topic. i believe convinced that this quantity should be welcomed by way of the and warmly suggest it to all who're in any respect concerned and attracted to the attention-grabbing international of drilling.
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Additional resources for Directional Drilling (Petroleum Engineering and Development Studies) (v. 2)
8b). A "permanent whipstock" is used mainly in cased hole for sidetracking around a fish or by-passing collapsed casing. A casing p~cker is set at the kick-off point to provide a base for the whipstock. The whipstock is run with a mill that will cut a "window" in the casing. After setting the whipstock in the required direction and shearing the retaining pin, the 24 DIRECTIONAL DRILLING Fig. 8. (a) Operation of whipstock. milling operation begins. Once the window has been cut, the mill is replaced by a small diameter pilot bit.
All directions must be given relative to True North before they can be used in survey calculations. Directions can be stated in two ways: (i) quadrant system, in which the angle is measured 0-90° from North or South. Some examples are given in Fig. 2. (ii) azimuth, in which the angle is measured 0-359° clockwise from North. Target Zone As well as defining a particular point as the target, the geologist will also specify a circular or rectangular area around that point known as the target zone. This allows the directional driller some tolerance on the final position of the well.
How should the toolface be oriented? The solution can be represented on a Ragland diagram as shown in Fig. 15. The line OA represents the present direction (050°). Along this line the current inclination (8°) is scaled off. This fixes the position P. At this point a circle representing the expected change of angle (HO) is drawn. "ection (060°) which cuts the circle at 2 points X and Y. The angle APY gives the orientation angle. Toolface settings are usually given in terms of degrees left or right f~ the High Side of the hole.
Directional Drilling (Petroleum Engineering and Development Studies) (v. 2) by Tom Inglis