Drilling fluid pump providing a uniform, controlled pressure and flow rate
US4527959A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1983 |
| Grant date | Jul 9, 1985 |
| Priority date | — |
| Expiry date | May 10, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B9/113
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump is provided for circulating drilling fluid and the like into a well during a well drilling process. The pump comprises a pair of double-ended piston assemblies hydraulically reciprocated in opposite directions by a common hydraulic drive arrangement, wherein each piston assembly has a relatively large piston at one end and a relatively small piston at an opposite end. The various pistons reciprocate within appropriately sized cylinders each having a working end with a one-way intake valve through which drilling fluid is drawn from a supply tank and a one-way discharge valve through which drilling fluid is discharged to the well. These intake and discharge valves, or other flow control valves in an alternative form of the invention, can be set appropriately for pumping drilling fluid at a relatively high pressure and low flow rate using only the smaller pistons or for pumping drilling fluid at a comparatively lower pressure and higher flow rate using only the larger pistons, wherein drilling fluid is continuously circulated by the unused pistons through the unused cylinders to maintain fluid flow thereby preventing settling of particulate entrained in the drilling fluid withi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.