# US 11,078,901 B2 · Method and system of slow rate pumping

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- Number: US 11,078,901 B2
- Document ID: US11078901B2
- Status: Granted
- Kind: B2
- Application number: 16/125,804
- Filed: 2018-09-10
- Published: 2020-03-12
- Granted: 2021-08-03
- Earliest claimed: 2018-09-10
- Applicants: Sanjel Energy Services Inc.
- Inventors: Ben Mattock; Charlie Eykelbosh; Jeff Spence; Josh Seens; Liguo Zhou; Daniel Blair Fisher; Bilal Abdurahman; Neville Dholoo
- Web page: https://patentgrep.com/patent/US11078901B2

## CPC

- F04B 49/08: Regulating by delivery pressure
- E21B 33/14: for cementing casings into boreholes
- E21B 43/14: Obtaining from a multiple-zone well
- F04B 1/005: {Pumps with cylinder axis arranged substantially tangentially to a circle centred on main shaft axis}
- F04B 49/22: by means of valves (F04B49/03 takes precedence)
- E21B 47/06: Measuring temperature or pressure
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A slow rate pumping system which includes a discharge line to receive a discharge flow of displacement fluid from a high rate pumper, a return line off of the discharge line to receive a return flow of displacement fluid, a slow rate diversion pumping line off of the discharge line for supplying a diversion flow of displacement fluid downhole, a return valve to control the return flow, and a diversion valve to control the downhole flow. A method of supplying a slow rate flow which includes receiving a main pumping flow through a return line at a pumping pressure, producing a differential pressure between the pumping pressure and a downhole pressure matching a differential setpoint, diverting a slow rate flow of fluid from the main flow using a diversion line off the return line prior to the return valve, and maintaining the differential pressure.

## Claims

### Claim 1

A slow rate pumping system, comprising:
a discharge line to receive a discharge flow of displacement fluid from a high rate pumper;
a return line off of the discharge line to receive a return flow of displacement fluid;
a slow rate pumping line to receive a flow from the discharge line for supplying a diversion flow of slow rate displacement fluid downhole;
a return valve to control the return flow; and
a diversion valve to control the diversion flow.

### Claim 2 (depends on 1)

The slow rate pumping system of claim 1, further comprising a diversion valve purge system.

### Claim 3 (depends on 2)

The slow rate pumping system of claim 2, wherein the diversion valve purge system includes:
a purge line off the slow rate pumping line for supplying a purge flow of displacement fluid out of the slow rate pumping system for use in purging the diversion valve; and
a purge valve to control the purge flow.

### Claim 4 (depends on 2)

The slow rate pumping system of claim 2, further comprising:
a main cementing line off of the return line for supplying a primary flow of displacement fluid or a primary flow of cementing fluid directly downhole from a main flow of fluid; and
a cementing control valve to control the primary flow of displacement fluid or the primary flow of cementing fluid.

### Claim 5 (depends on 2)

The slow rate pumping system of claim 2, further comprising a flow meter on the slow rate pumping line to measure the diversion flow.

### Claim 6 (depends on 5)

The slow rate pumping system of claim 5, wherein the flow meter is an ultrasonic flow meter.

### Claim 7 (depends on 5)

The slow rate pumping system of claim 5, further comprising a check valve after the flow meter.

### Claim 8 (depends on 2)

The slow rate pumping system of claim 2, wherein the diversion valve and the return valve are needle valves.

### Claim 9 (depends on 2)

The slow rate pumping system of claim 2, wherein valve actuation is controlled by a control system based on a set of pressure and flow rate setpoints.

### Claim 10 (depends on 2)

The slow rate pumping system of claim 2, wherein the slow rate pumping system is integrated into the high rate pumper to form a single dynamic range pumper.