Slurry comprising an encapsulated expansion agent for well cementing

Patent metadata

Field	Value
Publication number	US-2019161669-A1
Application number	US-201716091778-A
Country	US
Kind code	A1
Filing date	Apr 10, 2017
Priority date	Apr 8, 2016
Publication date	May 30, 2019
Grant date	—

Abstract

Methods to prepare a well cementing slurry include coating particles comprising an expanding agent with a component selected from the group consisting of a phenolic resin, a silica, a calcination product of a polysiloxane oil, and a combination thereof; and combining the coated particles with mix water and hydraulic cement to form a cement slurry for cementing a well.

First claim

1 . A method to prepare a well cementing slurry, comprising:
coating particles comprising an expanding agent with a component selected from the group consisting of a phenolic resin, a silica, a calcination product of a polysiloxane oil, and a combination thereof; and combining the coated particles with mix water and hydraulic cement to form a cement slurry for cementing a well.

2 . The method of claim 1 , wherein the expanding agent particles have an average particle size between 0.1μπτ and 500μπτ, and the coated particles have an average particle size between 1μπτ and 1000μπτ.

3 . The method of claim 1 , wherein the polysiloxane oil comprises polydimethylsiloxane, polyphenylmethylsiloxane, polydiphenylsiloxane, or combinations thereof, having a kinematic viscosity from 100 to 100,000 cSt.

4 . The method of claim 1 , wherein the coated particles are formed by mixing particles comprising the expanding agent with one or more polysiloxane oils to form oil-coated particles, followed by calcining the oil-coated particles at a temperature between 200° C. and 1000° C., for a period of time between 1 minute and 24 hours.

5 . The method of claim 4 , wherein the particles comprising the expanding agent are calcined at a temperature from 100° C. to 1500° C. for a period of time between 1 minute and 24 hours prior to said mixing the particles comprising the expanding agent with the polysiloxane oil to form the oil-coated particles.

6 . The method of claim 1 , wherein the coated particles comprise from 0.1 wt % to 35 wt % of the calcination product of the polysiloxane oil, based on the total weight of the coated particles.

7 . The method of claim 1 , wherein the coated particles comprise a plurality of layers, at least one layer comprising the calcination product of the polysiloxane oil.

8 . The method of claim 1 , wherein coating particles comprises:
contacting the expanding agent particles with a phenolic monomer and an aldehyde; and polymerizing the phenolic monomer and the aldehyde to form a layer of the phenolic resin coating.

9 . The method of claim 8 , wherein the phenolic monomer comprises phenol, and the aldehyde comprises formaldehyde, methylene glycol, trioxane, paraformaldehyde, or a combination thereof.

10 . The method of claim 1 , further comprising dry blending the coated particles and the hydraulic cement, and mixing the dry blend with the mix water.

11 . The method according to claim 1 , wherein the expanding agent comprises calcium oxide, magnesium oxide, calcium sulfate hemihydrate, or a combination thereof.

12 . The method of claim 1 , wherein the coating of the particles with silica comprises: contacting the particles with a solution of a silicate; and condensing the silicate in the coating.

13 . The method of claim 12 , wherein the silicate solution comprises a solvent and the silicate is selected from sodium silicate, potassium silicate, and the combination thereof.

14 . A well cementing slurry, comprising: water, a hydraulic cement, and a plurality of particles comprising an expanding agent coated with a component selected from the group consisting of a phenolic resin, a silica, a calcination product of a polysiloxane oil, and a combination thereof.

15 . A well cementing slurry, comprising: water, a hydraulic cement, and a plurality of particles comprising an expanding agent coated with a component selected from the group consisting of a phenolic resin, a silica, a calcination product of a polysiloxane oil, and a combination thereof, wherein the slurry is made according to the method of claim 1 .

16 . A system to cement a subterranean well, comprising: the well cementing slurry according to claim 14 ; and a pumping system to place the slurry in an annular region of the well.

17 . A method to cement a subterranean well, comprising:
(i) preparing the well cementing slurry according to claim 14 ; (ii) placing the slurry in an annular region of the well around a tubular member; (iii) hardening the slurry to form an at least partially set cement; and (iv) hydrating the expanding agent to form an expanded set cement within the annular region.

18 . The method according to claim 17 , wherein the cement slurry comprises an amount of expanding agent sufficient to form the expanded set cement transversely compressed within the annular region, and optionally isolating a zone of the formation adjacent the expanded set cement.

19 . The method according to claim 17 , further comprising:
preparing a proposed cement slurry formulation comprising the water, cement, and encapsulated expanding agent; determining that the proposed cement slurry formulation exhibits expansion characteristics of less than 50% relative expansion, based on a total percent expansion of the expanded set cement determined according to API-10B-5, prior to an initial set time for the proposed slurry formulation, determined according to ASTM C191-04aC, and greater than 50% relative expansion after the initial set time for the proposed slurry formulation, wherein the initial set time and relative expansion are determined at a maximum downhole pressure and temperature in the annular region up to 100° C., or at 100° C. if the maximum temperature of the annular region is greater than 100° C.; and preparing the cement slurry in (i) for the placing (ii), hardening (iii), and hydrating (iv), in accordance with the proposed cement slurry formulation exhibiting the characteristics determined in (b).

Assignees

• Schlumberger Technology Corp

Inventors

• Droger Nicolas
• Allouche Mickael
• Dennis Katia
• Komocki Sylwia

Classifications

• C09K8/473 Primary

  Density reducing additives, e.g. for obtaining foamed cement compositions · CPC title

• E21B33/14

  for cementing casings into boreholes · CPC title

• C04B2111/40

  Porous or lightweight materials · CPC title

• C04B22/064

  of the alkaline-earth metals · CPC title

• C04B20/1074

  Silicates, e.g. glass · CPC title