# US 10,479,920 B2 · Date tree trunk and rachis-based superfine fibrous materials for seepage loss control

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- Number: US 10,479,920 B2
- Document ID: US10479920B2
- Status: Granted
- Kind: B2
- Application number: 15/799,004
- Filed: 2017-10-31
- Published: 2018-12-06
- Granted: 2019-11-19
- Earliest claimed: 2017-05-30
- Assignees: Saudi Arabian Oil Company
- Applicants: Saudi Arabian Oil Company
- Inventors: Md Amanullah; Jothibasu Ramasamy
- Web page: https://patentgrep.com/patent/US10479920B2

## CPC

- C09K 8/203: {Wood derivatives, e.g. lignosulfonate, tannin, tall oil, sulfite liquor}
- C09K 8/035: Organic additives
- C09K 8/514: of natural origin, e.g. polysaccharides, cellulose (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
- 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

## Abstract

A date tree trunk- and rachis-based lost circulation material (LCM) is provided. The date tree trunk and rachis LCM includes superfine date tree trunk fibers produced from date tree trunks and superfine date tree rachis fibers produced from date tree rachises. The date tree trunks and rachises may be obtained from the date tree waste produced by the processing of date trees in the production of date fruits. The date tree trunk and rachis LCM may include fibers having lengths in the range of about 20 microns to about 300 microns. Methods of lost circulation control using a date tree trunk and rachis LCM and manufacture of a date tree trunk and rachis LCM are also provided.

## Claims

### Claim 1

A method to control lost circulation in a lost circulation zone in a wellbore, comprising:
introducing an altered drilling fluid into the wellbore such that the altered drilling fluid contacts the lost circulation zone and reduces a rate of lost circulation into the lost circulation zone, where the altered drilling fluid comprises a drilling fluid and a lost circulation material (LCM), wherein the drilling fluid comprises a low solid non-dispersed mud, wherein the LCM comprises:
a plurality of date tree trunk fibers produced from date tree trunks and a plurality of date tree rachis fibers produced from date tree rachises, each of the plurality of date tree trunk fibers and the plurality of date tree rachis fibers having a length in the range of about 20 microns (μm) to about 300 μm.

### Claim 2 (depends on 1)

The method of claim 1, wherein the altered drilling fluid consists of the drilling fluid and the LCM.

### Claim 3 (depends on 1)

The method of claim 1, wherein the LCM consists of the plurality of date tree trunk fibers and the plurality of date tree rachis fibers.

### Claim 4 (depends on 1)

The method of claim 1, wherein the plurality of date tree trunk fibers comprise a plurality of untreated date tree trunk fibers and the plurality of date tree rachis fibers comprise a plurality of untreated date tree rachis fibers.

### Claim 5 (depends on 1)

The method of claim 1, wherein the plurality of date tree trunk fibers and the plurality of date tree rachis fibers comprise a total amount in the range of 1% to 3% by weight of the total weight of the altered drilling fluid.

### Claim 6 (depends on 1)

The method of claim 1, wherein the reduced rate of lost circulation of a fluid portion of the altered drilling fluid is zero.