# US 9,040,468 B2 · Hydrolyzable particle compositions, treatment fluids and methods

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- Number: US 9,040,468 B2
- Document ID: US9040468B2
- Status: Granted
- Kind: B2
- Application number: 13/294,297
- Filed: 2011-11-11
- Published: 2012-05-31
- Granted: 2015-05-26
- Earliest claimed: 2007-07-25
- Assignees: Schlumberger Technology Corporation
- Applicants: Anthony Loiseau; Yiyan Chen; Mohan K. R. Panga
- Inventors: Anthony Loiseau; Yiyan Chen; Mohan K. R. Panga
- Web page: https://patentgrep.com/patent/US9040468B2

## CPC

- C09K 8/805: {Coated proppants}
- C09K 8/516: characterised by their form or by the form of their components, e.g. encapsulated material
- C09K 8/70: characterised by their form or by the form of their components, e.g. foams
- C09K 8/80: Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
- C09K 8/82: Oil-based compositions (C09K8/64 takes precedence)
- E21B 43/04: Gravelling of wells
- E21B 43/267: reinforcing fractures by propping
- C09K 2208/10: Nanoparticle-containing well treatment fluids
- C09K 2208/18: Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
- 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

A composition, treatment fluid and method using hydrolyzable fines. A treatment fluid, which may optionally include a high solids content fluid (HSCF) and/or an Apollonianistic solids mixture, includes a fluid loss control agent comprising a dispersion of hydrolyzable fines, optionally with one or more of a surfactant, plasticizer, dispersant, degradable particles, reactive particles and/or submicron particles selected from silicates, γ-alumina, MgO, γ-Fe2O3, TiO2, and combinations thereof.

## Claims

### Claim 1

A treatment fluid, comprising:
an Apollonianistic solids mixture comprising proppant slurried in a carrier fluid; and
a fluid loss control agent comprising a hydrolyzable fines dispersion in admixture therewith wherein the fluid further comprises submicrons particles comprising silicates.

### Claim 2 (depends on 1)

The treatment fluid of claim 1, wherein the hydrolyzable fines dispersion comprises polyester particles having a particle size distribution mode from 0.1 to 20 microns.

### Claim 3 (depends on 1)

The treatment fluid of claim 1, wherein the hydrolyzable fines dispersion comprises polyester particles and a surfactant.

### Claim 4 (depends on 1)

The treatment fluid of claim 1, wherein the hydrolyzable fines dispersion comprises a polymer or copolymer of lactic acid, glycolic acid, or the combination thereof, treated with a nonionic or anionic surfactant.

### Claim 5 (depends on 1)

The treatment fluid of claim 1, wherein the hydrolyzable fines dispersion comprises a surfactant and optionally a plasticizer.

### Claim 6 (depends on 1)

The treatment fluid of claim 1, further comprising from 1 to 15 parts per 100 parts by weight carrier fluid of one or more of a dispersant, a surfactant, a viscosifier, a defoamer, or a combination thereof.

### Claim 7 (depends on 1)

The treatment fluid of claim 1, wherein the solids mixture is Apollonianistic and further comprises at least one particle size distribution mode comprising degradable particles comprising a polymer or copolymer of lactic acid, glycolic acid, or the combination thereof.

### Claim 8 (depends on 1)

The treatment fluid of claim 1, wherein the solids mixture is Apollonianistic and further comprises an acid-reactive fines particle size distribution mode.

### Claim 9

A treatment fluid, comprising:
an Apollonianistic solids mixture comprising proppant, degradable particles and silicates submicron particles, slurried in an aqueous carrier fluid,
wherein the degradable particles comprise a polymer or copolymer of lactic acid, glycolic acid, or the combination thereof,
wherein the degradable particles comprise first and second particle size distribution modes wherein the first particle size distribution mode is from 1.5 to 2.5 times larger than the second particle size distribution mode and wherein the first PSD mode is smaller than a PSD mode of the proppant, and
wherein the treatment fluid comprises from 0 to 3 parts by weight dispersant, from 0 to 3 parts by weight surfactant, from 0 to 3 parts by weight defoamer, and from 0 to 15 parts by weight viscosifier, per 100 parts by weight carrier fluid; and
in admixture therewith, a fines emulsion comprising 1 to 5 micron polylactide particles, an anionic surfactant and optionally a plasticizer.

### Claim 10 (depends on 9)

The treatment fluid of claim 9, wherein the Apollonianistic solids mixture further comprises acid-reactive fines having a particle size distribution mode smaller than the second PSD mode and from 1 to 20 microns.

### Claim 11

A composition, comprising:
a carrier fluid and dispersed therein from 5 to 100 g added per 100 ml carrier fluid of a fluid loss control system comprising a mixture of surfactant-treated hydrolyzable fines having a particle size distribution between 1 and 10 microns, and submicron particles
wherein the carrier fluid is aqueous, the hydrolyzable fines comprise polylactic acid having a particle size distribution between about 1 and about 5 microns emulsified or stabilized with an anionic surfactant, and the submicron particles comprise silicates and wherein a weight ratio of the hydrolyzable fines to submicron particles is from 1:3 to 3:1.