Methods for stimulating multi-zone wells
AssigneeExxonMobil Upstream Research Company
InventorsJose Oliverio Alvarez, Michael T. Hecker, Ted A. Long, Scott R. Clingman
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Abstract
A method for stimulating a multi-zone wellbore completed with a string of production casing, including pumping a first volume of acidic fluid into the wellbore under pressure, and then injecting the first volume of acidic fluid into a first zone of interest along the production casing dropping at least one plug into the wellbore, the plug being fabricated from a material that substantially dissolves in the presence of the acidic fluid at or over a selected period of time.
Claims30
A method for stimulating a multi-zone wellbore, the multi-zone wellbore being completed with a string of production casing, and the method comprising:
- pumping a first volume of acidic fluid into the wellbore comprising a first set of perforations in a first zone of interest and another set of perforations in a second zone of interest;
- injecting the first volume of acidic fluid through the first set of perforations and into at least the first zone of interest along the production casing;
- dropping a plug into the wellbore, the plug having a defined geometry and being fabricated from a material that dissolves in the presence of the acidic fluid at or over a selected period of time;
- pumping a second volume of acidic fluid into the wellbore;
- setting the plug along the production casing at least partially above the first zone of interest to inhibit the flow of the second volume of acidic fluid into the first zone of interest;
- and
- injecting the second volume of acidic fluid through the another set of perforations and into the second zone of interest along the production casing and above the first zone of interest.
A method for stimulating a multi-zone wellbore, the wellbore being completed with a string of production casing in a substantially vertical orientation, and the method comprising:
- creating a first set of perforations in a first zone of interest and another set of perforations in a second zone of interest;
- thereafter pumping a first volume of acidic fluid into the wellbore;
- dropping a fluid diversion plug into the wellbore, the fluid diversion plug having a defined geometry, and being fabricated from a material that dissolves in the presence of the first volume of acidic fluid over a selected period of time;
- pumping a second volume of acidic fluid into the wellbore in order to push the fluid diversion plug down the wellbore and to cause at least a portion of the first volume of acidic fluid to travel into the first zone of interest along the production casing;
- setting the fluid diversion plug along the production casing above the first zone of interest to inhibit the flow of the second volume of acidic fluid into the first zone of interest;
- injecting at least a portion of the second volume of acidic fluid into the second zone of interest along the production casing and above the fluid diversion plug before the fluid diversion plug substantially dissolves;
- dropping a fluid displacement plug into the wellbore, the fluid displacement plug also having a defined geometry, and being fabricated from a material that dissolves in the presence of the second volume of acidic fluid over the selected period of time;
- and
- pumping a third volume of fluid into the wellbore in order to push the fluid displacement plug down the wellbore and to at least partially inject the second volume of acidic fluid into the second zone of interest above the first zone of interest.
Dependencies are inferred from the claim text.