Segmented Drilling Fluid Density Control Device

Abstract

The present invention relates to a drilling fluid density segmented regulation device, comprising a joint body; the joint body is provided with a central hole, the central hole is 5 composed of a diameter-constant straight hole and a tapered hole, and the joint body is provided with fluid discharge through-holes; the diameter-constant straight hole is provided therein with a guide impeller barrel, the guide impeller barrel is provided therein with a backflow fluid through hole, the guide impeller barrel is fixedly provided with a fluid discharge pipe, the fluid discharge pipe is in sealed communication with the fluid discharge through-holes, the guide impeller barrel 10 is fixedly provided with an overflow pipe, and the overflow pipe is disposed in sealed communication with the backflow fluid through hole. Deep-water variable-gradient drilling can be realized by the device, thereby reducing the drilling cost, and solving the problem of the narrow-density window in deep-water drilling. 161 0 0 0 C j 42 FIG.-1

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a drilling fluid density segmental control device. Background technique [0002] In recent years, 50% of the world's major oil and gas exploration and development has come from the ocean, mainly in deep water areas. Deep water areas have become an important replacement area for oil and gas exploration and development in the world. Deepwater oil and gas exploration and development are becoming the main growth point of world oil and the frontier of technological innovation, and deepwater will become the main battlefield for oil and gas resources in the future. [0003] Drilling is a key link in deepwater oil and gas exploration and development, and deepwater drilling faces many challenges and risks: (1) Challenges brought about by water depth. With the increase of water depth, higher requirements are put forward for drilling tools, drilling fluid, riser, platform bearin...

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Problems solved by technology

[0006] The object of the present invention is to provide a drilling fluid density segmental control device, through which deep water variable gradient drilling can be realized, which solves the problem of too many casing layers in single-gradient drilling, and also solves the problem of double-gradient drilling. The problem of requiring large equipment in drilling, reducing drilling costs, and finally solving the problem of narrow density windows in deepwater drilling

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