Downhole fluids and methods of use thereof

Patent metadata

Field	Value
Publication number	US-2019390099-A1
Application number	US-201916562587-A
Country	US
Kind code	A1
Filing date	Sep 6, 2019
Priority date	Apr 10, 2015
Publication date	Dec 26, 2019
Grant date	—

Abstract

The present disclosure relates to downhole fluid additives including a clay, a hydroxylated polymer, a cation, and water. The disclosure further relates to downhole fluids, including drilling fluids, spaces, cements, and proppant delivery fluids containing such as downhole fluid additive and methods of using such fluids. The downhole fluid additive may have any of a variety of functions in the downhole fluid and may confer any of a variety of properties upon it, such as salt tolerance or desired viscosities even at high downhole temperatures.

First claim

What is claimed is:

1 - 25 . (canceled)

26 . A system for cementing a wellbore, the system comprising:
a cement comprising:
a clay;
a hydroxylated polymer;
a cation;
the clay, the hydroxylated polymer, and the cation together in an amount sufficient to render the downhole fluid thermally stable at a temperature of 400° F.; and
at least one additional downhole fluid component; and
a cement base; and
a pump operable to pump the cement into a wellbore in a subterranean formation in an amount sufficient to fill an annulus between a casing in the wellbore and the wellbore and to bond to both the casing and the wellbore.

27 . The system of claim 26 , further comprising mixing equipment operable to mix the cement prior to pumping the cement into the wellbore.

28 . The system of claim 26 , wherein the mixing equipment comprises a jet mixer operable to continuously mix the cement as it is pumped into the wellbore.

29 - 34 . (canceled)

35 . The system of claim 26 , wherein the clay comprises a phyllosilicate clay.

36 . The system of claim 35 , wherein the phyllosilicate clay comprises a smectite clay.

37 . The system of claim 35 , wherein the phyllosilicate clay comprises a sepiolite clay.

38 . The system of claim 35 , wherein the phyllosilicate clay comprises a palygorskite clay.

39 . The system of claim 26 , wherein the cement comprises salt water.

40 . A system for introducing a spacer into a subterranean formation, the system comprising:
a spacer comprising:
a clay;
a hydroxylated polymer;
a cation;
the clay, the hydroxylated polymer, and the cation together in an amount sufficient to render the downhole fluid thermally stable at a temperature of 400° F.; and
at least one additional downhole fluid component; and
a pump operable to pump the spacer into the interior of a casing or a wellbore annulus in a wellbore in the subterranean formation to displace drilling fluid remaining in the wellbore.

41 . The system of claim 40 , wherein the clay comprises a phyllosilicate clay.

42 . The system of claim 41 , wherein the phyllosilicate clay comprises a smectite clay.

43 . The system of claim 41 , wherein the phyllosilicate clay comprises a sepiolite clay.

44 . The system of claim 41 , wherein the phyllosilicate clay comprises a palygorskite clay.

45 . The system of claim 40 , wherein the spacer comprises salt water.

46 . A system for delivering a proppant to a fracture in a subterranean formation, the system comprising:
a proppant delivery fluid comprising:
a clay;
a hydroxylated polymer;
a cation;
the clay, the hydroxylated polymer, and the cation together in an amount sufficient to render the downhole fluid thermally stable at a temperature of 400° F.;
a proppant; and
at least one additional downhole fluid component; and
a pump operable to pump the proppant delivery fluid into the subterranean formation.

47 . The system of claim 46 , wherein the clay comprises a phyllosilicate clay.

48 . The system of claim 47 , wherein the phyllosilicate clay comprises a smectite clay.

49 . The system of claim 47 , wherein the phyllosilicate clay comprises a sepiolite clay.

50 . The system of claim 47 , wherein the phyllosilicate clay comprises a palygorskite clay.

51 . The system of claim 46 , wherein the spacer comprises salt water.

Assignees

• Halliburton Energy Services Inc

Inventors

• Goel Vivek S
• Boul Peter James
• Pang Xueyu
• Hall Lee J
• Deville Jay P
• Lewis Samuel J
• Reddy B Raghava
• Joseph Trissa
• Ye Xiangnan

Classifications

• C09K2208/32

  Anticorrosion additives · CPC title

• C09K8/80

  Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open · CPC title

• C09K8/40

  Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses · CPC title

• C09K2208/34

  Lubricant additives · CPC title

• C09K8/487

  Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title