Device and method for simulating hydrate decomposition induced by invasion of drilling fluid into reservoir

Abstract

The invention provides a device and a method for simulating hydrate decomposition induced by invasion of drilling fluid into a reservoir. The device comprises a high-pressure reaction kettle (34), a high-low-temperature water bath temperature control system (102), a high-low-temperature constant-temperature air bath box (21), a drilling fluid pumping system (104), a gas control system (105), a back-pressure unloading system (106) and a data acquisition system (107), wherein the reaction kettle is arranged in the high-low-temperature constant-temperature air bath box, a reaction temperature ofthe reaction kettle and a gas temperature in the gas control system are respectively controlled by the high-low-temperature water bath temperature control system, and the drilling fluid pumping systemis connected to the reaction kettle through a pipeline, the back-pressure unloading system and the gas control system communicate with the interior of the reaction kettle through pipelines and air inlet / outlet holes (10) formed in the upper part of the reaction kettle, and the back-pressure unloading system is used for separately controlling the pressure balance of the reaction kettle, the gas control system and the outside.

Description

technical field [0001] The invention relates to the field of natural gas exploration and development, in particular, the invention relates to a device and method for simulating drilling fluid intrusion into a reservoir to induce hydrate decomposition. Background technique [0002] Natural gas hydrate is an ice-like crystalline compound formed by water molecules and hydrocarbon gas molecules under low temperature and high pressure conditions. It is also called "combustible ice" or "solid gas". It has the characteristics of high energy density, wide distribution, and large reserves. , is a new and alternative energy source with great potential. [0003] Gas hydrates are widely distributed in permafrost and ocean areas, and the stored natural gas far exceeds the known natural gas reserves. Exploration and development of natural gas hydrates is inseparable from drilling, and in order to ensure that hydrates in the reservoir will not decompose in large quantities during drilling...

AI Technical Summary

Problems solved by technology

[0004] In order to weaken the hydrate decomposition caused by drilling fluid invasion, low-temperature drilling fluid system is usually used in the process of hydrate drilling, but the existing research has not quantitatively analyzed the drilling fluid invasion temperature, drilling fluid invasion amount and drilling fluid The invasion rate is relatively safe, that is to say, it will not cause obvious negative situations; however, there is no detailed reference data for drilling fluid invasion temperature, invasion volume and invasion rate beyond which range will induce negative situations or even safety risks

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