Formation squeeze monitor apparatus
First Claim
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1. An apparatus for monitoring formation squeeze in a well borehole having a borehole wall comprising:
- a) an elongated tool body;
b) sump means in the tool body for containing a source of fluid;
c) means on the tool body and extendable to engage the borehole wall for holding the tool body in the borehole and spaced from the borehole wall to define a test interval;
d) collapsible container means carried by the tool body and inflatable with the source of fluid; and
e) means for providing a controlled, localized reduction of pressure head at a test interval adjacent the collapsible container; and
f) measuring means for measuring a resulting inward displacement of the borehole wall in response to said reduction of pressure head.
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Abstract
A fluid squeeze monitor downhole tool and a method of monitoring formation squeeze features a tool body that can be placed downhole at a desired elevational location to produce a controlled, localized reduction of pressure head and measure the resultant inward displacement of the borehole wall. The reduction in head is accomplished by draining the fluid in a bladder (or collapsible container) located on the tool body into a reservoir "sump" that is incorporated into the downhole tool.
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Citations
21 Claims
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1. An apparatus for monitoring formation squeeze in a well borehole having a borehole wall comprising:
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a) an elongated tool body; b) sump means in the tool body for containing a source of fluid; c) means on the tool body and extendable to engage the borehole wall for holding the tool body in the borehole and spaced from the borehole wall to define a test interval; d) collapsible container means carried by the tool body and inflatable with the source of fluid; and e) means for providing a controlled, localized reduction of pressure head at a test interval adjacent the collapsible container; and f) measuring means for measuring a resulting inward displacement of the borehole wall in response to said reduction of pressure head. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of monitoring formation squeeze in a borehole having a borehole wall, comprising the steps of:
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a) lowering an elongated tool body having a pair of spaced-apart expandable packers with a collapsible fluid containing container therebetween into the borehole, to an elevational position wherein formation squeeze is to be monitored; b) expanding the pair of spaced-apart packers until the formation borehole wall is contacted to define a test interval therebetween; c) obtaining an initial reading of fluid pressure head inside the test interval; d) draining some fluid from the collapsible container to produce a controlled, localized reduction of pressure head in the test interval at the borehole wall; and e) monitoring the resulting inward displacement of the borehole wall. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification