Methods and compositions for mitigating water production
Embodiments provide methods and compositions for mitigating water production for hydrocarbon recovery. According to an embodiment, the method involves a treatment fluid composition. The treatment fluid composition includes a base liquid, a gelling agent, and a crosslinking agent. The treatment fluid composition is introduced downhole where it is positioned in a high permeability streak adjacent to a wellbore. After crosslinking, the treatment fluid composition blocks water in the high permeability streak from penetrating into the wellbore.
1. A method for mitigating water production for hydrocarbon recovery, the method comprising the steps of:
introducing a first base liquid, a gelling agent, and a crosslinking agent into a hydrocarbon-bearing formation via a wellbore, where at least two of the first base liquid, the gelling agent, and the crosslinking agent form a mixture in the hydrocarbon-bearing formation;
introducing montmorillonite clay into the hydrocarbon-bearing formation via the wellbore;
maintaining the mixture under formation conditions such that a gelled treatment fluid is formed, where the gelling agent and the crosslinking agent form a crosslinked network of molecules, and where at least a portion of the first base liquid is incorporated in the crosslinked network,
where the gelled treatment fluid reduces water permeability of the hydrocarbon-bearing formation and inhibits water from permeating from the hydrocarbon-bearing formation,
where the gelling agent is selected from the group consisting of: a phosphonate ester, a phosphoric acid ester, a fatty acid soap, and combinations of the same,
where the montmorillonite clay increases the viscosity of the gelled treatment fluid.
2. The method of claim 1 , where the gelling agent and the cros slinking agent are combined in a ratio from 1:100 to 100:1 by volume.
3. The method of claim 1 , where the water permeability of the hydrocarbon-bearing formation is greater than 100 millidarcies.
4. The method of claim 1 , where the first base liquid is hydrocarbon based.
5. The method of claim 1 , where the first base liquid is selected from the group consisting of: diesel, biodiesel, crude oil, kerosene, gas oil, fuel oil, hydrotreated oil, mineral oil, paraffinic oil, fatty acids, olefins, alkanes, aromatics solvents, esters, acetals, ethers, siloxanes, and combinations of the same.
6. The method of claim 1 , where the first base liquid is mineral oil.
7. The method of claim 1 , further comprising the step of:
introducing a second base liquid into the hydrocarbon-bearing formation via the wellbore, where the second base liquid is chemically different from the first base liquid.
8. The method of claim 7 , where at least a portion of the second base liquid is incorporated in the crosslinked network.
9. The method of claim 1 , where the gelling agent is the phosphonate ester selected from the group consisting of: phosphonate monoester, phosphonate diester, and combinations of the same.
10. The method of claim 1 , where the crosslinking agent includes atoms selected from the group consisting of: aluminum, iron, chromium, zirconium, titanium, boron, and combinations of the same.
11. The method of claim 1 , further comprising the step of:
introducing an additive into the hydrocarbon-bearing formation via the wellbore, where the additive is configured to delay viscosity breaking of the gelled treatment fluid.
12. The method of claim 1 , further comprising the step of:
introducing an additive into the hydrocarbon-bearing formation via the wellbore such that in the maintaining step, the additive is configured to delay for a period of time the gelling agent and the crosslinking agent from forming the crosslinked network.
13. The method of claim 1 , further comprising the step of:
introducing an additive into the hydrocarbon-bearing formation via the wellbore, where the additive is acidic and is configured to buffer and neutralize basic substances present in the treatment fluid composition.
14. The method of claim 1 , further comprising the step of:
introducing an additive into the hydrocarbon-bearing formation via the wellbore, where the additive is configured to absorb water.
15. The method of claim 1 , where the gelling agent is the phosphoric acid ester having the formula:
where R includes a hydrocarbon group having from 1 to 30 carbon atoms and R′ includes a hydrocarbon group having from about 1 to about 6 carbon atoms, where each of R and R′ includes a linear or branched alkyl, alkenyl, aryl, alkylaryl, arylalkyl, cycloalkyl, alkyl ether, aryl ether, alkyl aryl ether, or combinations of the same.
16. The method of claim 1 , where the gelled treatment fluid further comprises:
where X includes an OR 1 , NR 1 R 2 , or SR 1 group, R 1 being an organic group having 2 to 24 carbon atoms, and R 2 being an organic group or a hydrogen, and Y includes an NR 3 R 4 or SR 3 group, R 3 being an organic group having 2 to 24 carbon atoms, and R 4 being an organic group or a hydrogen.
17. The method of claim 1 , further comprising the step of:
applying a positive hydraulic pressure into the wellbore to provide a shearing force causing physical erosion to the gelled treatment fluid.