Drilling fluid invasion depth testing device and testing method

Abstract

The invention belongs to the technical field of petroleum drilling, and particularly discloses a drilling fluid invasion depth testing device which comprises a support, a glass core barrel, a drillingfluid container, a heating device for heating drilling fluid and a medium delivery device. The glass core barrel is horizontally arranged to the support, the inside of the glass core barrel is filledwith quartz sand with a preset length section, measure scales are arranged on the outer wall of the glass core barrel along the length direction, and a sealing end cover is arranged at each of two ends of the glass core barrel; one end of the medium delivery device is connected to one end of the glass core barrel while the other end of the same is connected to the drilling fluid container. The invention further discloses a testing method applying the drilling fluid invasion depth testing device. By the drilling fluid invasion depth testing device and the testing method, depth and state when drilling fluid invades a reservoir can be visually and quantitatively simulated and tested, and a basis is provided for evaluating degree of damage caused to the oil-gas reservoir by the drilling fluidand selecting the drilling fluid good for the oil-gas reservoir.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a testing device and a testing method for drilling fluid penetration depth. Background technique [0002] During the oil drilling process, the original balance of the formation is broken. Under the action of the chemical potential difference, the solid and liquid phases in the drilling fluid inevitably invade the formation, changing the original state of the reservoir fluid distribution near the wellbore. Drilling fluid usually contains liquid phase filtrate and solid phase particles, some of which are necessary components of drilling fluid, and some are harmful phases that have not been removed; because the liquid phase in drilling fluid is often related to the composition of oil and gas reservoir rocks or The incompatibility of the interstitial fluids will lead to chemical reactions to produce precipitation or solid substances, which will induce formation damage such...

AI Technical Summary

Problems solved by technology

[0007] In summary, measuring the drilling fluid invasion depth is of great significance to oil and gas well drilling engineering and reservoir protection, but the current conventional instruments are difficult to effectively measure the drilling fluid invasion depth of reservoir pollution, and the theoretical calculation deviation is large

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