Methods of Quantifying Gas Content of a Gas-Sorbed Formation Solid
First Claim
1. A method of calculating a production characteristic for an undersaturated methane reservoir comprising the steps of:
- a. accessing a well admitted to an undersaturated methane reservoir;
b. sampling formation water from said undersaturated methane reservoir;
c. conducting a test based on said formation water sample;
d. inductively quantifying a methane content value of sorbed methane that is sorbed in a solid formation substance from said water sample;
e. calculating an economic production characteristic for said methane reservoir; and
f. applying said economic production characteristic to calculate and report a practical production quantity for said methane reservoir.
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Abstract
The evaluation and assessment of geologic formations comprising undersaturated methane reservoirs. In some embodiments, the present invention provides for inductively quantifying critical desorption pressure of the solid in an undersaturated methane reservoir from an unrelated substance, the formation water. By using these techniques, the characterization of undersaturated methane reservoirs may be more quickly and economically made based upon a methane content characteristic such as critical desorption pressure, gas content, and in some embodiments gas content as calculated from isotherm evaluation, estimates of dewatering for production, and ratios of critical desorption pressure to initial reservoir pressure, among other possible characteristics. The features of the invention may further have applicability in combination with conventional reservoir analysis, such as coring, logging, reservoir isotherm evaluation, or other techniques.
3 Citations
155 Claims
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1. A method of calculating a production characteristic for an undersaturated methane reservoir comprising the steps of:
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a. accessing a well admitted to an undersaturated methane reservoir;
b. sampling formation water from said undersaturated methane reservoir;
c. conducting a test based on said formation water sample;
d. inductively quantifying a methane content value of sorbed methane that is sorbed in a solid formation substance from said water sample;
e. calculating an economic production characteristic for said methane reservoir; and
f. applying said economic production characteristic to calculate and report a practical production quantity for said methane reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26-145. -145. (canceled)
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146. A method of calculating a production characteristic for an undersaturated methane reservoir comprising the steps of:
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a. accessing an existing well admitted to a methane reservoir;
b. sampling formation water from said methane reservoir;
c. conducting a test based on said formation water sample;
d. estimating an economic factor for commercial production from said well based upon said step of conducting a test based on said formation water sample; and
e. applying said economic factor to calculate and report a practical production quantity for said methane reservoir.
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147-153. -153. (canceled)
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154. A dynamic method of surface sampling subsurface formation water comprising the steps of:
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a. accessing a well admitted to an undersaturated methane reservoir;
b. assuring that a formation water sample is representative of fluid from said undersaturated methane reservoir;
c. initially sampling formation water from said undersaturated methane reservoir;
d. conducting an initial test based on said initial formation water sample;
e. additionally sampling formation water from said undersaturated methane reservoir;
f. conducting a similar test based on said additional formation water sample;
g. comparing results of said initial sampling and said additional sampling; and
h. achieving a constancy in said comparing the results through alteration of actions affecting said step of sampling formation water from said undersaturated methane reservoir;
wherein said step of achieving a constancy in said comparing the results of said multiple similar tests through alteration of actions affecting said step of sampling formation water from said undersaturated methane reservoir comprises the step of achieving a substantially constant critical desorption pressure result.
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155-336. -336. (canceled)
Specification
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- Resources
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Current AssigneeYates Petroleum Corporation (EOG Resources Incorporated)
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Original AssigneeYates Petroleum Corporation (EOG Resources Incorporated)
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InventorsCarlson, Francis
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Application NumberUS11/927,332Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current166/250.01CPC Class CodesE21B 43/006 Production of coal-bed meth...E21B 49/00 Testing the nature of boreh...
