Emulsified resin-based loss circulation materials for low pressure formations

Patent metadata

Field	Value
Publication number	US-11739250-B2
Application number	US-202117185000-A
Country	US
Kind code	B2
Filing date	Feb 25, 2021
Priority date	Feb 25, 2021
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

Lost circulation material (LCM) compositions may include an epoxy resin, an emulsifier comprising a polyaminated fatty acid, water, a crosslinker, and an optional cementitious and/or weighting agent. These LCM compositions may have a density of from about 63 pounds per cubic foot (pcf) to about 99 pcf and may be capable of being injected through a drill bit of a drill string into a lost circulation zone in wellbores. Corresponding methods of eliminating or reducing lost circulation in a lost circulation zone from a well may include introducing these LCM compositions into the well.

First claim

The invention claimed is:

1. A lost circulation material (LCM) composition comprising:
5 to 75 wt % of an emulsified epoxy resin;
0.1 to 20 wt % of an emulsifier comprising a polyaminated fatty acid;
5 to 25 wt % water;
1.4 to 1.7 wt % of a crosslinker; and
wherein the LCM composition has a thickening time ranging from 2 hours to 3 hours and 45 minutes; and
wherein the LCM composition has a density of from about 63 pounds per cubic foot (pcf) to about 99 pcf and is capable of being injected through a drill bit of a drill string into a lost circulation zone in wellbores.

2. The LCM composition of claim 1 , where the LCM composition has a density of from about 70 pcf to about 79 pcf.

3. The LCM composition of claim 1 , where the epoxy resin comprises at least one of bisphenol-A-epichlorohydrin epoxy resin, C12-C14 alkyl glycidyl ether derivatives, 2,3-epoxypropyl o-tolyl ether, 1,6-hexanediol diglycidyl ether, butyl glycidyl ether, cyclohexanedimethanol diglycidyl ether, or combinations of these.

4. The LCM composition of claim 1 , where the epoxy resin comprises bisphenol -A-epichlorohydrin epoxy resin and C12-C14 alkyl glycidyl ether.

5. The LCM composition of claim 1 further comprising a reactive diluent comprising oxirane mono [(C12-C14)-alkyloxy) methyl] derivatives.

6. The LCM composition of claim 1 , where the crosslinker comprises at least one of diethylenetriamine (DETA), diethyltoluenediamine (DETDA), polyoxypropylene diamine, or combinations of these.

7. The LCM composition of claim 1 , where the LCM composition comprises from about 0 wt % to about 70 wt % cementitious and/or weighting agent.

8. The LCM composition of claim 1 , where the LCM composition includes a cementitious and/or weighting agent.

9. The LCM composition of claim 1 , where the cementitious and/or weighting agent comprises class G cement, barite (barium sulfate), calcium carbonate (CaCO3), ilmenite, or combinations of these.

10. A method of eliminating or reducing lost circulation in a lost circulation zone from a well, the method comprising:
introducing a first lost circulation material (LCM) composition into the well, the first LCM composition comprising:
an emulsified epoxy resin;
an emulsifier comprising a polyaminated fatty acid;
water;
1.4 to 1.7 wt % of a crosslinker; and
an optional cementitious and/or weighting agent selected from the group consisting of calcium carbonate (CaCO3), ilmenite, and a combination thereof,

wherein the LCM composition has a thickening time ranging from 2 hours to 3 hours and 45 minutes: and
wherein the first LCM composition has a density of from about 63 pounds per cubic foot (pcf) to about 99 pcf.

11. The method of claim 10 , further comprising thickening the first LCM composition in the well.

12. The method of claim 11 , further comprising introducing a second LCM composition in the well after the thickening of the first LCM composition.

13. The method of claim 10 , where the first LCM composition has a density of from about 70 pcf to about 79 pcf.

14. The method of claim 10 , where the lost circulation zone is located in formations having pressures of from about 63 pcf to about 99 pcf.

15. The method of claim 10 , where the lost circulation zone is located at a depth of up to 5000 feet.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Safran Ali
• Alanqari Khawlah A
• Wagle Vikrant
• Al-Joher Abdulwahab
• Al-Yami Abdullah S

Classifications

• C09K8/512 Primary

  containing cross-linking agents · CPC title

• C09K8/5045 Primary

  containing inorganic compounds · CPC title

• E21B21/003

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

• E21B33/138

  Plastering the borehole wall; Injecting into the formation · CPC title

• C09K8/508

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