Drilling simulation experiment device

Abstract

The invention relates to a well drilling simulation test device. The well drilling simulation test device comprises a rock core clamping mechanism, a drilling mechanism, a pressing mechanism and a pressing control pipeline, wherein the rock core clamping mechanism and the drilling mechanism are concentrically arranged above and below a test frame; constant pressure liquid which is applied to the upper end of the rock core by a constant pressure pump of the pressing mechanism and constant pressure liquid or high pressure gas which is pressed on the rock core by a constant pressure pump of the drilling mechanism or a high pressure gas source are converged in a simulated cavity at the bottom of the well, and are controlled to flow out by the pressing control pipeline consisting of a filter, a back pressure device and a flowmeter; the back pressure device is connected with the high pressure gas source of the drilling mechanism and controls the pressure of the simulated cavity at the bottom of the well by controlling the gas supply pressure of the high pressure gas source; the pressing mechanism, a pressure sensor of the back pressure device and the flowmeter transmit signals to a computer; and change of related parameters is controlled by the computer program, so that various drilling schemes are simulated and tested, and indoor test data is provided for increasing drilling speed,improving drilling quality and reducing drilling cost.

Description

technical field [0001] The invention relates to a simulation experiment device for parameters related to drilling in an oil field, in particular to a drilling simulation experiment device that provides reliable theoretical data for near-balanced, under-balanced, and over-balanced drilling in an oil field, so as to formulate a more reasonable drilling implementation plan. Background technique [0002] With the development of drilling technology, near-balanced, under-balanced and over-balanced drilling technologies are all applied, among which under-balanced drilling technology has been proved to be a feasible and cost-effective method. In conventional overbalanced or near-balanced drilling, in addition to carrying cuttings, stabilizing the well wall, and cooling the drill bit, the drilling fluid is more important to balance the formation pressure and prevent the formation fluid from entering the wellbore. In underbalanced drilling, the bottom hole circulation pressure is cons...

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Problems solved by technology

[0003] However, the existing drillability measuring instruments at home and abroad can only measure the drillability of rocks under normal pressure, but cannot measure the drillability of rocks in the real stress environment in the downhole stress field.

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