# US 2014/0190695 A1 · Methods Using Stimulation-Capable Drill-In and Completion Fluids

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- Number: US 2014/0190695 A1
- Document ID: US20140190695A1
- Status: Published application
- Kind: A1
- Application number: 13/733,927
- Filed: 2013-01-04
- Published: 2014-07-10
- Earliest claimed: 2013-01-04
- Assignees: Halliburton Energy Services, Inc.
- Applicants: Halliburton Energy Services, Inc.
- Inventors: Ryan Van Zanten; Abdalla Moustafa Ezzat
- Web page: https://patentgrep.com/patent/US20140190695A1

## CPC

- C09K 8/88: macromolecular compounds
- C09K 8/12: containing synthetic organic macromolecular compounds or their precursors
- C09K 8/508: macromolecular compounds {(C09K8/512 takes precedence)}
- E21B 43/00: Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

Methods comprising providing a drill-in fluid including an aqueous carrier fluid, a surfactant; and a self-degradable filter cake-forming agent which includes a plurality of degradable particulates which are operable to form an acid upon degradation, and a plurality of acid-degradable particulates. Drilling a wellbore through a reservoir section of a subterranean formation with the drill-in fluid, forming a thin internal filter cake within the wellbore from the self-degradable filter cake-forming agent. Releasing an acid derivative from at least a portion of the plurality of degradable particulates, interacting the acid with the filter cake so as to at least partially degrade the acid-degradable particulates therein. Thereby at least partially removing the filter cake allowing quick lift off of the remaining particulates, and producing a hydrocarbon fluid or gas from the subterranean formation.

## Claims

### Claim 1

A method comprising:
providing a drill-in fluid comprising:
an aqueous fluid;
a surfactant; and
a self-degradable filter cake-forming agent, the self-degradable filter cake-forming agent comprising:
a plurality of degradable particulates, the plurality of degradable particulates being operable to form an acid upon degradation; and
a plurality of acid-degradable particulates;
drilling a wellbore through a reservoir section of a subterranean formation with the drill-in fluid;
forming an internal filter cake within the wellbore from the self-degradable filter cake-forming agent;
providing an in situ generated acid from at least a portion of the plurality of degradable particulates;
allowing the in situ generated acid to interact with the filter cake so as to at least partially degrade the filter cake, thereby allowing quick lift off of the remaining particulates; and
producing a hydrocarbon fluid or gas from the subterranean formation.

### Claim 2 (depends on 1)

The method of claim 1, wherein drilling a wellbore comprises drilling a multi-lateral horizontal wellbore system.

### Claim 3 (depends on 1)

The method of claim 1, wherein the plurality of degradable particulates comprises an acid-generating substance selected from the group consisting of a polyester, a polylactide, a polyglycolide, a poly(e-caprolactone), a polyanhydride, a poly(orthoester), a poly(amino acid), and any combination thereof.

### Claim 4 (depends on 1)

The method of claim 1, wherein the plurality of degradable particulates comprises poly(lactic acid).

### Claim 5 (depends on 1)

The method of claim 1, wherein the surfactant comprises a microemulsion-forming surfactant.

### Claim 6 (depends on 1)

The method of claim 1, wherein the plurality of acid-degradable particulates comprises calcium carbonate particulates.

### Claim 7 (depends on 1)

The method of claim 1, wherein the drill-in fluid comprises between about 0.01 wt. % and about 20 wt. % of the surfactant.

### Claim 8 (depends on 1)

The method of claim 1, wherein the drill-in fluid comprises between about 1 wt. % and about 10 wt. % of the plurality of degradable particulates.

### Claim 9 (depends on 1)

The method of claim 1, wherein the drill-in fluid comprises between about 1 wt. % and about 25 wt. % of the plurality of acid-releasing degradable particulates.

### Claim 10

A method comprising:
providing a completion fluid comprising:
an aqueous carrier fluid;
a surfactant; and
a self-degradable fluid sealing agent, the self-degradable fluid sealing agent comprising:
a plurality of degradable particulates, the plurality of degradable particulates being operable to release an acid upon degradation; and
a plurality of sized acid-degradable particulates;
introducing the completion fluid into an uncompleted wellbore penetrating a subterranean formation or perforations through cased wellbore into the formation;
forming a fluid seal within the uncompleted wellbore from the self-degradable fluid sealing agent;
performing a completion operation in the uncompleted wellbore;
providing an in situ generated acid from at least a portion of the plurality of degradable particulates;
allowing the in situ generated acid to interact with the fluid seal so as to at least partially degrade the fluid seal, thereby at least partially removing the fluid seal; and
easily producing a hydrocarbon fluid and/or gas from the subterranean formation.

### Claim 11 (depends on 10)

The method of claim 10, wherein at least a portion of the completion fluid penetrates into the subterranean formation from the uncompleted wellbore.

### Claim 12 (depends on 10)

The method of claim 10, wherein the plurality of degradable particulates comprises an acid-generating substance selected from the group consisting of a polyester, a polylactide, a polyglycolide, a poly(e-caprolactone), a polyanhydride, a poly(orthoester), a poly(amino acid), and any combination thereof.

### Claim 13 (depends on 10)

The method of claim 10, wherein the plurality of degradable particulates comprises poly(lactic acid).

### Claim 14 (depends on 10)

The method of claim 10, wherein the surfactant comprises a microemulsion-forming surfactants.

### Claim 15 (depends on 10)

The method of claim 10, wherein the plurality of acid-degradable particulates comprises calcium carbonate particulates.

### Claim 16 (depends on 10)

The method of claim 10, wherein the completion fluid comprises between about 0.01 wt. % and about 20 wt. % of the surfactant.

### Claim 17 (depends on 10)

The method of claim 10, wherein the completion fluid comprises between about 1 wt. % and about 10 wt. % of the plurality of degradable particulates.

### Claim 18 (depends on 10)

The method of claim 10, wherein the completion fluid comprises between about 1 wt. % and about 25 wt. % of the plurality of acid-degradable particulates.