# US 10,479,918 B2 · Two-component lost circulation pill for seepage to moderate loss control

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- Number: US 10,479,918 B2
- Document ID: US10479918B2
- Status: Granted
- Kind: B2
- Application number: 15/440,474
- Filed: 2017-02-23
- Published: 2018-01-11
- Granted: 2019-11-19
- Earliest claimed: 2016-07-06
- Assignees: Saudi Arabian Oil Company
- Applicants: Saudi Arabian Oil Company
- Inventors: Jothibasu Ramasamy; Md Amanullah
- Web page: https://patentgrep.com/patent/US10479918B2

## CPC

- C09K 8/035: Organic additives
- C09K 8/5045: {containing inorganic compounds}
- C09K 8/508: macromolecular compounds {(C09K8/512 takes precedence)}
- C09K 8/516: characterised by their form or by the form of their components, e.g. encapsulated material
- E21B 21/003: {Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138)}
- C09K 2208/08: Fiber-containing well treatment fluids
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## 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.

## Claims

### Claim 1

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 solution comprising an acrylic polymer and water;
introducing, after introducing the first component, 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 and water.

### Claim 2 (depends on 1)

The method of claim 1, 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.

### Claim 3 (depends on 1)

The method of claim 1, 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.

### Claim 4 (depends on 1)

The method of claim 1, 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.

### Claim 5 (depends on 1)

The method of claim 1, wherein the carrier fluid of the first component comprises water.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

The method of claim 1, wherein the second component consists of sodium hydroxide and water.

### Claim 9 (depends on 1)

The method of claim 1, wherein the second component comprises 25% by weight of the sodium hydroxide.

### Claim 10 (depends on 1)

The method of claim 1, wherein the fly ash comprises an amount in the range of 200 grams to 400 grams.

### Claim 11 (depends on 1)

The method of claim 1, wherein the polypropylene comprises an amount in the range of 2 grams to 6 grams.

### Claim 12 (depends on 1)

The method of claim 1, wherein the acrylic polymer solution comprises at least 30% by weight acrylic polymer.

### Claim 13 (depends on 12)

The method of claim 12, wherein the acrylic polymer solution of the first component comprises an amount in the range of 20 milliliters to 40 milliliters.