Compostion for borehole treatment

Patent metadata

Field	Value
Publication number	US-2016201411-A1
Application number	US-201615079857-A
Country	US
Kind code	A1
Filing date	Mar 24, 2016
Priority date	Sep 26, 2008
Publication date	Jul 14, 2016
Grant date	—

Abstract

The invention is a composition, for use in treating oil wells, comprising fibres, hot melt adhesives and particulate solids. This composition has a wide range of applications including preventing or lessening lost circulation, wellbore strengthening or consolidation, controlling fluid loss, producing a “stress cage” effect, gravel packing, acting as an aid to cementing, and for proppant backflow control.

First claim

1 - 19 . (canceled)

20 . A method of treating an oil well, comprising:
pumping a composition comprising:
a well treatment fluid including fibers;
at least one hot melt adhesive component; and,
and at least one solid particulate component; allowing the fibers to accumulate in a region of the oil well to be treated; raising the temperature in the borehole in the region to be treated to a level above the transition temperature of the hot melt adhesive component such that the fibers adhere to each other in the region. wherein the hot melt adhesive is suitable to soften when the temperature in the region of the borehole is raised above the transition temperature of said adhesive component, and wherein particles of the hot melt adhesive component are grafted onto at least some of the fibers.

21 . The method of claim 1 , wherein the network forms a screen on which a filtercake can form over downhole loss zones.

22 . The method of claim 1 further comprising allowing the temperature in the region to drop to a level below the transition temperature of the hot melt adhesive component so as to create an interconnected network of fibers in the region to be treated.

23 . The method of claim 1 , wherein the fibers are present at a concentration between 1.4 g/L and 23 g/L in the well treatment fluid.

24 . The method of claim 1 , wherein the fibers have diameters ranging from 10 microns to 500 microns.

25 . The method of claim 1 , wherein the fibers have lengths ranging from 5 to 25 mm.

26 . The method of claim 1 , wherein the fibers comprise polypropylene, novoloid, kelvlar, glass, polyamide, polyacrylate, polylactic resin, polyvinyl alcohol, polyester, nylon, or cellulose or combinations thereof.

27 . The method of claim 1 , wherein the solid particulate component comprises lost circulation materials.

28 . The method of claim 8 , wherein the solid particulate component has a size ranging from 10 μm to 1000 μm.

29 . A method of treating an oil well, comprising:
pumping a composition into a borehole to region to be treated, wherein the composition comprises: a well treatment fluid including fibers, the fibers being present at a concentration between 1.4 g/L and 23 g/L; and,
at least one hot melt adhesive component; and,
raising the temperature in the borehole in the region to be treated to a level above the transition temperature of the hot melt adhesive component such that the fibres adhere to each other in the region to be treated.

30 . A method as claimed in claim 10 , wherein the network forms a screen on which a filtercake can form over downhole loss zones.

31 . A method as in claim 10 further comprising allowing the temperature in the region to drop to a level below the transition temperature of the hot melt adhesive component so as to create an interconnected network of fibers in the region to be treated.

32 . A method as claimed in claim 10 , wherein the composition further comprises at least one solid particulate component.

33 . The method of claim 13 , wherein the solid particulate component comprises lost circulation materials.

34 . A method as claimed in claim 10 , wherein particles of the hot melt adhesive component are grafted onto at least some of the fibers.

35 . The method of claim 10 , wherein the fibers have diameters ranging from 10 microns to 500 microns.

36 . The method of claim 10 , wherein the fibers have lengths ranging from 5 to 25 mm.

37 . A method of using a hot melt adhesives for the treatment of a borehole wherein said hot melt adhesives is in contact with fibers and solid particles characterized in that said hot melt adhesive forms a network with said fibers and solid particles when the temperature in the borehole is above its glass transition temperature.

38 . The method of claim 18 , wherein the treatment is a reduction of loss circulation.

39 . The method of claim 18 , wherein the treatment is a consolidation of a formation surrounding the borehole, the formation being reinforced as the network is sticking to part of the substrate of said formation.

Assignees

• Schlumberger Technology Corp

Inventors

• Shindgikar Nikhil
• Lee Jesse

Classifications

• C09K8/516

  characterised by their form or by the form of their components, e.g. encapsulated material · CPC title

• C04B20/1037

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• E21B21/003 Primary

  Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138) · CPC title

• C09K2208/08

  Fiber-containing well treatment fluids · CPC title

• C09K8/44

  containing organic binders only · CPC title