Locating the relative trajectory of a relief well drilled to kill a blowout well
First Claim
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1. A method of locating a relative trajectory of a relief well with respect to a blowout well intersecting subsurface formations at known depths comprising the steps of:
- determining at what depths said blowout well intersects said subsurface formations;
logging said relief well for some measurable parameter which indicates said subsurface formations to produce a measured parameter log indicating where said relief well intersects said subsurface formations;
selecting from said log correlation points at which said relief well and said blowout well intersect the same subsurface formations; and
locating the relative trajectory of said relief well with respect to said blowout well from bore hole length differences between formation intersection depths in said relief well and blowout well taken between the same correlation points.
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Abstract
In the drilling of a relief well to kill a blowout well, the relative trajectory of the relief well with respect to the blowout well is determined by selecting correlation points at which the relief well and the blowout well intersect the same subsurface formation. A resistivity log of the relief well indicates the correlation points with the blowout well. The location of the relative trajectories is obtained from the differences in depths of the formations and the correlation points.
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Citations
11 Claims
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1. A method of locating a relative trajectory of a relief well with respect to a blowout well intersecting subsurface formations at known depths comprising the steps of:
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determining at what depths said blowout well intersects said subsurface formations; logging said relief well for some measurable parameter which indicates said subsurface formations to produce a measured parameter log indicating where said relief well intersects said subsurface formations; selecting from said log correlation points at which said relief well and said blowout well intersect the same subsurface formations; and locating the relative trajectory of said relief well with respect to said blowout well from bore hole length differences between formation intersection depths in said relief well and blowout well taken between the same correlation points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification