Remote mud pump control apparatus

• US 4,595,343 A
• Filed: 09/12/1984
• Issued: 06/17/1986
• Est. Priority Date: 09/12/1984
• Status: Expired due to Term

• Current Assignee: Varco International Inc. (NOV, Inc.)
• Original Assignee: Baker Drilling Equipment Company
• Inventors: Thompson, Steven R., Harbour, William D. Jr.
• Primary Examiner(s): Croyle, Carlton R.
• Assistant Examiner(s): Neils, Paul F.
• Application Number:
  US06/649,705
• Time in Patent Office: 643 Days
• Field of Search: 417/2, 417/5, 417/7, 417/34, 417/53, 417/63, 417/426, 417/572, 175/24, 175/38, 175/40, 175/48, 175/217
• US Class Current: 417/53
• CPC Class Codes: E21B 21/08 Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure valve arrangements therefor E21B21/10

Abstract

Apparatus for controlling the operation of drilling or completion fluid pumps and a choke is disclosed. Control over the drilling or completion fluid pump can be independent of control of the choke. Control over the drilling fluid pump can be transferred to the choke control location. Pneumatic and electrical networks suitable for use with engine driven and electrically powered rigs are disclosed.

Claims

1. Apparatus for controlling the circulation of fluid in a subterranean well comprising:

a pump;

a choke communicable with the pump;

pump monitoring means for regulating the pump speed to vary the flow rate of the circulating fluid;

choke monitoring means located at the surface of the well remote from the pump monitoring means and including choke regulating means for varying the fluid flow area through the choke to control the pressure of the circulating fluid as the flow rate is changed by variations in the pump speed;

the improvement comprising;

a second pump control means incorporated in the choke monitoring means and communicable with the pump through the pump monitoring means for regulating the pump speed.

2. Apparatus for use on a surface drilling rig for controlling a drilling fluid circulation pump and a choke communicable with the pump during the circulation of drilling fluids between the surface and the borehole of a subterranean well, the apparatus comprising:

a first pump control means for regulating the operation and speed of the pump to vary the flow rate of the circulating fluid;

second pump control means communicable with the pump and said first pump control means for varying the operation and speed of the pump, located proximate to the choke and remote from the first control means and from the pump; and

overriding means proximate to the first pump control means responsive to a signal for disabling the first pump control means upon actuation of the second pump control means, the second pump control means communicating with the pump through the overriding means.

3. The apparatus of claim 2 wherein the overriding means is connected to the first and second pump control means and comprises means for automatically transferring control over the pump to the first pump control means when no signal is received from the second pump control means.

4. The apparatus of claim 3 wherein the first and second pump control means and the overriding means comprise fluid means.

5. The apparatus of claim 4 wherein the first and second pump control means comprises means for generating separate throttle and clutch signals for controlling the speed and operation of the pump.

6. The apparatus of claim 5 wherein the overriding means comprises a valve interposed between the first pump control means and a source of fluid pressure, the valve being shiftable to isolate the first pump control means from the source of fluid pressure in response to a fluid pressure signal from the second pump control means.

7. The apparatus of claim 6 further comprising double input, single output valves interconnected at the inputs to the first and second pump control means, the output communicating with the pump.

12. The apparatus of claim 2 wherein the means for disabling the first pump control means is incorporated in the pump monitoring means.

13. The apparatus of claim 12 further comprising means for transmitting a clutch signal and a throttle signal from the pump monitoring means to the pump.

14. The apparatus of claim 13 wherein the first and second pump control means and the disabling means comprise fluid means.

8. Apparatus for controlling the circulation of fluid in a subterranean well comprising:

a pump;

a choke communicable with the pump;

pump monitoring means located at the surface of the well and including first pump control means for regulating the pump speed to vary the flow rate of the circulating fluid;

choke monitoring means located at the surface of the well remote from the pump monitoring means and including choke regulating means for varying the fluid flow area through the choke to control the pressure of the circulating fluid as the flow rate is changed by variations in the pump speed;

the improvement comprising;

a second pump control means incorporated in the choke monitoring means and communicable with the pump through the pump monitoring means for regulating the pump speed; and

means for disabling the first pump control means upon actuation of the second pump control means, whereby the pump and the choke can be controlled from the same location at the surface of the well to regulate the flow rate and pressure of the circulating fluid.

9. The apparatus of claim 8 further comprising interconnecting means between the pump monitoring means and the choke monitoring means.

10. The apparatus of claim 8 wherein the first and second pump control means and the disabling means comprise electrical means.

11. The apparatus of claim 10 wherein the first and second pump control means comprise rheostats and the disabling means comprises normally open and normally closed relays.

15. Apparatus for varying the fluid flow of drilling fluid circulating between a surface drilling rig and subsurface locations in a subterranean well borehole in response to kicks occuring during drilling, comprising:

drilling means including a drilling fluid pump located on the surface drilling rig;

a choke spaced from the pump to the surface drilling rig and communicable with the pump;

drilling monitoring means located on the surface rig for monitoring the drilling means including pump monitoring means, further including first pump control means for regulating the operation and speed of the pump to vary the flow rate of the circulating fluid in response to a kick;

choke monitoring means proximate the choke and remote from the drilling monitoring means and including choke regulating means for varying the fluid flow area through the choke to control the pressure of circulating fluid as the flow rate is varied by the operation and speed of the pump;

the improvement comprising;

a second pump control means incorporated in the choke monitoring means and communicable with the pump through the pump monitoring means for regulating the operation and speed of the pump; and

means for disabling the first pump control means upon actuation of the second pump control means, whereby the pump and choke can be controlled at the choke to regulate the flow rate and pressure of the circulating fluid in response to kicks occurring during drilling.

16. A method for use in controlling the circulation of drilling fluid between the surface and the borehole of a subterranean well from a choke monitoring console proximate to a choke and remote from a pump and from a drilling monitoring console on a drilling rig, comprising the steps of:

controlling the pump from the drilling monitoring console and the choke from the choke monitoring console in the absence of an overriding signal from the choke monitoring console to the drilling monitoring console;

overriding control of the pump by the drilling monitoring console by transmitting an overriding signal to the drilling monitoring console from the choke monitoring console; and

thereafter,

controlling both the pump and the choke from the choke monitoring console.

17. The method of claim 16 wherein the signals controlling the pump transmitted from the choke monitoring console comprise the overriding signal.