Automatic rock debris sampling device and method based on suction mode

Abstract

The invention discloses an automatic rock debris sampling device and method based on a suction mode. The device is characterized in that a pump inlet of a mud sampling pump is connected with a three-way valve, one of the other two connectors of the three-way valve is connected with an elevated tank through a sampling pipeline, the other connector is connected with a circulating cleaning water tank through a sampling pipeline, a pump outlet of the mud sampling pump is connected with an inlet of a solid-liquid separation device through a mud pipeline, a vibration motor is installed on the solid-liquid separation device, a rock debris outlet is formed in the upper portion of an inclined surface, an inlet of a rock debris storage case is formed in the bottom of the rock debris outlet, and a mud outlet is formed in the lower portion of the inclined surface and connected with the three-way valve. According to the automatic rock debris sampling device based on the suction mode, drilling fluid is obtained from the front end of a vibration screen in a pump suction mode, rock debris samples are separated from the drilling fluid, and the problem that in a manual sampling mode, rock debris is mixed through the vibration screen, and accordingly rock debris stratum representativeness becomes poor can be effectively solved.

Description

technical field [0001] The invention belongs to the field of petroleum engineering exploration, in particular to a cuttings automatic sampling device and cuttings automatic sampling method based on a suction mode in the field. Background technique [0002] In the process of oil exploration, geological analysis of cuttings returned from the bottom of the well is an important method to discover oil and gas layers. At present, the method of manually obtaining cuttings is still used at home and abroad, and the accuracy and timeliness of sampling cannot be guaranteed. It cannot meet the needs of rapid drilling, and the analysis results obtained from wrong geological samples not only fail to guide oil exploration, but may cause serious misleading, which restricts the development of oil exploration technology. [0003] Since the fishing object is transported from the bottom of the well to the surface by the mud, in order to balance the formation pressure, reduce friction and clean ...

AI Technical Summary

Problems solved by technology

[0005] (1) The system does not form a closed-loop control, lacks the detection of the mud flow rate and the weight of the cuttings removed, and cannot adjust the cuttings removal process according to the actual working conditions of the drilling site; (2) Both the sampling and return of the mud are realized by pumping , and it is difficult for the pump to maintain long-term stable operation in the mud environment with high viscosity, easy drying, and many particles, and the return pump in the scheme is vertical to the pipeline, and the particles are more likely to block the pump, causing failure, increasing maintenance costs, and affecting Operating efficiency; (3) Cuttings can only be stored in a maximum of 1 box, and the degree of automation is low, which is no different from manual fishing, which does not really liberate manpower; (4) Large in size and overweight, it is very difficult to drill in a space-constrained drilling site. Difficult to find a suitable installation location

Images