Layer density determination using surface and deviated borehole gravity values
First Claim
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1. A method for providing the intermediate layer densities between the wellbore of a deviated well and the surface in a multi layer geological structure comprising the steps of:
- obtaining conventional surface gravity measurements along a line that lies approximately along the same surface orientation as the deviated well;
making borehole gravity measurements in the deviated part of the well along the wellbore at stations lying approximately below those taken on the surface;
correlating said conventional gravity measurements and said borehole gravity measurements to form station pair measurements;
computing the gravity difference for each station pair from said station pair measurements;
determining the average density for all the station pairs from the gravity difference and the vertical distance between the two readings;
obtaining interval depths at each layer between the surface and the borehole stations from a depth model; and
calculating an interval layer density from the average density between the two points in each station pair and their relation to the interval densities.
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Abstract
Conventional surface gravity measurements, either land, sea, or sea bottom, are made along a line that lies approximately along the same surface orientation as the deviated well. Borehole gravity measurements are made in the deviated part of the well along the wellbore at stations lying approximately below those taken on the surface. The gravity difference is computed from the station pairs. From the gravity difference and the vertical distance between the two readings, the average density is computed for all the station pairs. From a depth model interval depths at each layer between the surface and the borehole stations are computed. The average density between any station pairs can be related to the interval densities and the layer densities are calculated.
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Citations
7 Claims
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1. A method for providing the intermediate layer densities between the wellbore of a deviated well and the surface in a multi layer geological structure comprising the steps of:
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obtaining conventional surface gravity measurements along a line that lies approximately along the same surface orientation as the deviated well; making borehole gravity measurements in the deviated part of the well along the wellbore at stations lying approximately below those taken on the surface; correlating said conventional gravity measurements and said borehole gravity measurements to form station pair measurements; computing the gravity difference for each station pair from said station pair measurements; determining the average density for all the station pairs from the gravity difference and the vertical distance between the two readings; obtaining interval depths at each layer between the surface and the borehole stations from a depth model; and calculating an interval layer density from the average density between the two points in each station pair and their relation to the interval densities. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for providing the intermediate layer densities between the wellbore of a deviated well and the surface in a multi layer geological structure comprising the steps of:
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obtaining conventional surface gravity measurements along a line that lies approximately along the same surface orientation as the deviated well by designating specific locations spaced apart a predetermined distance and performing conventional gravity measurements at said specific locations; making borehole gravity measurements in the deviated part of the well along the wellbore at stations lying approximately below those taken on the surface using a modified La Coste and Romberg borehole gravity meter so that it can be leveled and read in the highly deviated part of the wellbore; correlating said conventional gravity measurements and said borehole gravity measurements to form station pair measurements; computing the gravity difference for each station pair from said station pair measurements; determining the average density for all the station pairs from the gravity difference and the vertical distance between the two readings; obtaining interval depths at each layer between the surface and the borehole stations from a depth model; and calculating an interval layer density from the average density between the two points in each station pair and their relation to the interval densities.
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Current AssigneeConoco Incorporated (ConocoPhillips)
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Original AssigneeConoco Incorporated (ConocoPhillips)
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InventorsPennybaker, Kent A.
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Primary Examiner(s)Williams, Hezron E.
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Assistant Examiner(s)BROCK, MICHAEL J
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Application NumberUS07/805,282Time in Patent Office553 DaysField of Search73/151, 73/152, 73/382 R, 73/382 G, 166/250, 364/420, 364/422US Class Current73/152.05CPC Class CodesG01V 7/06 Analysis or interpretation ...
