# US 11,441,419 B2 · Downhole telemetry system having a mud-activated power generator and method therefor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,441,419 B2
- Document ID: US11441419B2
- Status: Granted
- Kind: B2
- Application number: 17/161,227
- Filed: 2021-01-28
- Published: 2021-08-19
- Granted: 2022-09-13
- Earliest claimed: 2017-05-01
- Assignees: U-Target Energy Ltd.
- Applicants: U-Target Energy Ltd.
- Inventors: Xia Pan; Zhenyuan Hu; Fuchun Liu; Silviu Calin; Zhiqun Wang; Jack Wang; Michel Herzig
- Web page: https://patentgrep.com/patent/US11441419B2

## CPC

- E21B 47/13: by electromagnetic energy, e.g. radio frequency
- E21B 4/02: Fluid rotary type drives
- E21B 7/067: {with means for locking sections of a pipe or of a guide for a shaft in angular relation, e.g. adjustable bent sub}
- E21B 17/0285: {characterised by electrically insulating elements}
- E21B 17/042: Threaded
- E21B 41/0085: {Adaptations of electric power generating means for use in boreholes}
- E21B 47/017: Protecting measuring instruments
- E21B 47/0228: using electromagnetic energy or detectors therefor
- E21B 47/18: through the well fluid {, e.g. mud pressure pulse telemetry}
- E21B 49/00: Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A complete telemetry system and methods for downhole operations. The telemetry system includes an instrumented near-bit sub located below the Mud Motor and connected to the drill bit as well as a conventional MWD tool located above the mud motor. Parameters such as inclination of the borehole, the natural gamma ray of the formations, the electrical resistivity of the formations, and a range of mechanical drilling performance parameters are measured. Electromagnetic telemetry signals representing these measurements are transmitted uphole to a receiver associated with the conventional MWD tool located above the motor, and transmitted by this tool to the surface via mud pulse signals. The system is particularly useful for accurate control over the drilling of extended reach and horizontally drilled wells.

## Claims

### Claim 1

A mud-activated power generator comprising:
a housing having a chamber therein in fluid communication with two longitudinally opposite ports thereof, a first sidewall of the housing comprising therein one or more first pockets circumferentially about the chamber, each first pocket receiving therein one or more coils; and
a rotor rotatably received in the chamber;
wherein the rotor comprises:
a longitudinal bore in fluid communication with the chamber;
a sidewall about the longitudinal bore and comprising one or more second pockets receiving therein one or more magnets; and
one or more blades extending from an inner surface of the rotor radially inwardly and longitudinally at an acute angle with respect to an axis of the rotor.

### Claim 2 (depends on 1)

The mud-activated power generator of claim 1, wherein the housing comprises a downhole-facing circumferential shoulder on an inner surface of the sidewall defining an uphole end of the chamber, and a ring removably mounted to the inner surface of the sidewall defining a downhole end of the chamber.

### Claim 3 (depends on 2)

The mud-activated power generator of claim 2, wherein the rotor has a length shorter than that of the chamber.