Two-component lost circulation pill for seepage to moderate loss control

Patent metadata

Field	Value
Publication number	US-2018010030-A1
Application number	US-201715440474-A
Country	US
Kind code	A1
Filing date	Feb 23, 2017
Priority date	Jul 6, 2016
Publication date	Jan 11, 2018
Grant date	—

Abstract

A two-component lost circulation material (LCM) is provided having a polymer component and a sodium hydroxide component. The polymer component may include a carrier fluid such as water, a particulate material such as fly ash, a fibrous material such as polypropylene fibers, and an acrylic polymer. The sodium hydroxide component may include water and sodium hydroxide. The sodium hydroxide component is introduced to contact the polymer component to form the two-component LCM. Methods of lost circulation control and manufacture of a two-component LCM are also provided.

First claim

What is claimed is:

1 . A lost circulation material (LCM) composition, comprising:
a first component comprising:
a carrier fluid;
fly ash;
polypropylene fibers; and
an acrylic polymer; and
a second component comprising sodium hydroxide.

2 . The LCM composition of claim 1 , wherein the carrier fluid of the first component comprises water.

3 . The LCM composition of claim 1 , wherein the LCM composition consists of the first component and the second component.

4 . The LCM composition of claim 1 , wherein the first component consists of:
the carrier fluid; fly ash; polypropylene fibers; and the acrylic polymer.

5 . The LCM composition of claim 1 , wherein the second component comprises water.

6 . The LCM composition of claim 5 , wherein the second component consists of sodium hydroxide and water.

7 . The LCM composition of claim 5 , wherein the second component comprises 25% by weight of the sodium hydroxide.

8 . The LCM composition of claim 1 , wherein the fly ash of the first component comprises an amount in the range of 200 grams to 400 grams.

9 . The LCM composition of claim 1 , wherein the polypropylene fibers of the first component comprises an amount in the range of 2 grams to 6 grams.

10 . The LCM composition of claim 1 , wherein the acrylic polymer comprises an acrylic polymer solution comprising water and at least 30% by weight acrylic polymer.

11 . The LCM composition of claim 10 , wherein the acrylic polymer solution of the first component comprises an amount in the range of 20 milliliters to 40 milliliters.

12 . The LCM composition of claim 1 , wherein the LCM has a gel stiffness modulus (GSM) of at least 15.881 pounds/millimeter (lb/mm).

13 . The LCM composition of claim 1 , wherein the LCM has a yield strength of at least 74 pounds-force (lbf).

14 . A method to control lost circulation in a lost circulation zone in a wellbore, comprising:
introducing a first component into the wellbore such that the first component contacts the lost circulation zone, wherein the first component comprises:
a carrier fluid;
fly ash;
polypropylene fibers; and
an acrylic polymer;
introducing a second component into the wellbore, such that the second component contacts first component in the lost circulation zone, wherein the second component comprises sodium hydroxide.

15 . The method of claim 14 , wherein introducing the first component into the wellbore such that the first component contacts the lost circulation zone comprises introducing an altered drilling fluid having the first component into the wellbore, such that the altered drilling fluid contacts the lost circulation zone.

16 . The method of claim 14 , wherein introducing the second component into the wellbore such that the second component contacts the first component in the lost circulation zone comprises:
inserted coiled tubing into the wellbore; and introducing the second component via coiled tubing via the wellbore.

17 . The method of claim 14 , wherein introducing the second component into the wellbore such that the second component contacts the first component in the lost circulation zone comprises forming a lost circulation material (LCM) from a reaction of the first component with the second component.

18 . The method of claim 14 , wherein the carrier fluid of the first component comprises water.

19 . The method of claim 14 , wherein the LCM composition consists of the first component and the second component.

20 . The method of claim 14 , wherein the first component consists of:
the carrier fluid; fly ash; polypropylene fibers; and the acrylic polymer

21 . The method of claim 14 , wherein the second component comprises water.

22 . The method of claim 21 , wherein the second component consists of sodium hydroxide and water.

23 . The method of claim 21 , wherein the second component comprises 25% by weight of the sodium hydroxide.

24 . The method of claim 14 , wherein the fly ash comprises an amount in the range of 200 grams to 400 grams.

25 . The method of claim 14 , wherein the polypropylene comprises an amount in the range of 2 grams to 6 grams.

26 . The method of claim 14 , wherein the acrylic polymer comprises an acrylic polymer solution comprising water and at least 30% by weight acrylic polymer.

27 . The method of claim 26 , wherein the acrylic polymer solution of the first component comprises an amount in the range of 20 milliliters to 40 milliliters.

28 . A method of forming a lost control material (LCM) composition, comprising:
adding a carrier fluid to form a first mixture; adding a particulate material to the first mixture, the particulate material comprising fly ash; adding a fibrous material to the first mixture, the fibrous material comprising polypropylene fibers. adding an acrylic polymer solution to the first mixture; adding water to form a second mixture; and adding sodium hydroxide to the second mixture, wherein the LCM composition is formed by contacting the first mixture with the second mixture.

29 . The method of claim 28 , wherein the carrier fluid comprises water.

30 . The method of claim 28 , wherein the second component comprises 25% by weight of the sodium hydroxide.

31 . The method of claim 28 , wherein the LCM has a gel stiffness modulus (GSM) of at least 15.881 pounds-force/millimeter (lbf/mm).

32 . The method of claim 28 , wherein the LCM has a yield strength of at least 74 pounds-force (lbf).

33 . The method of claim 28 , wherein the fly ash comprises at least 55% by weight of the LCM composition.

34 . The method of claim 28 , wherein the polypropylene fibers comprise at least 0.7% by weight of the LCM composition.

35 . The method of claim 28 , wherein the acrylic polymer comprises an acrylic polymer solution comprising water and at least 30% by weight acrylic polymer.

36 . The method of claim 35 , wherein the acrylic polymer solution comprises at least 7.7% by weight of the LCM composition.

Assignees

• Saudi Arabian Oil Co

Inventors

• Ramasamy Jothibasu
• Amanullah Md

Classifications

• C09K8/516

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

• C09K8/508

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

• C09K8/5045 Primary

  containing inorganic compounds · CPC title

• C09K2208/08

  Fiber-containing well treatment fluids · CPC title

• E21B21/003

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