Fluid pressure transmission pill

Patent metadata

Field	Value
Publication number	US-9279304-B2
Application number	US-201514589219-A
Country	US
Kind code	B2
Filing date	Jan 5, 2015
Priority date	Apr 3, 2007
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

A pill for wellbore operations, that includes a base fluid; and at least two polymers that interact to form a gelatinous structure characterized as isolating and controllably transmitting hydrostatic pressure between a first wellbore fluid above the pill in a wellbore and a second wellbore fluid below the pill in the wellbore is disclosed.

First claim

What is claimed:

1. A method of a wellbore operation, comprising:
emplacing a first wellbore fluid in a wellbore;
spotting a pill to a region within the emplaced first wellbore fluid; and
allowing the spotted pill to viscosify and separate the first wellbore fluid into an upper section and a lower section, wherein the viscosified pill is a gelatinous structure characterized as isolating and controllably transmitting hydrostatic pressure between the two fluid sections.

2. The method of claim 1 , further comprising:
emplacing a second wellbore fluid.

3. The method of claim 2 , wherein the emplacement of the second fluid displaces at least a portion of the upper section of the first wellbore fluid.

4. The method of claim 1 , wherein the second wellbore fluid has a greater density than the first wellbore fluid.

5. The method of claim 1 , wherein the pill comprises:
a base fluid; and
at least two polymers that interact to form the gelatinous structure.

6. A process for completing a well, comprising:
emplacing a first wellbore fluid having a first density in a wellbore;
spotting a pill to a region within the emplaced first wellbore fluid;
allowing the spotted pill to viscosify and separate the first wellbore fluid into an upper section and a lower section, wherein the viscosified pill is a gelatinous structure characterized as isolating and controllably transmitting hydrostatic pressure between two fluid sections; and
emplacing a second wellbore fluid having a second density greater than the first density in the wellbore, wherein the emplacement of the second wellbore fluid displaces at least a portion of the upper section of first wellbore fluid.

7. The method of claim 6 , further comprising:
positioning a liner in the wellbore, wherein the viscosified pill remains substantially intact during the positioning.

8. The method of claim 6 , further comprising:
removing the liner from the wellbore, wherein the viscosified pill remains substantially intact during the removal.

Assignees

• Mi Llc

Inventors

• Prebensen Ole Iacob
• Norman Monica
• Friestad Anne-Marie
• Ronaes Egil

Classifications

• E21B21/08

  Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure (valve arrangements therefor E21B21/10) · CPC title

• C09K8/426

  for plugging · CPC title

• C09K8/00

  Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations · CPC title

• C09K8/502 Primary

  Oil-based compositions · CPC title

• C09K8/508

  macromolecular compounds {(C09K8/512 takes precedence)} · CPC title