Passive degassing device as well as tank body and slurry treating element thereof

Abstract

The invention provides a passive degassing device as well as a tank body and a slurry treating element thereof. In the slurry treating element, a slurry dispersing unit consists of an upper slurry dispersing element and a lower slurry dispersing element, wherein an assembly end cover is arranged on the upper part of the tank body, and is formed by an end cover closed end portand an assembly end face; the slurry treating element is serially arranged into a whole by virtue of the slurry dispersing unit, and is fixed in the tank body by virtue of the assembly end cover to form an assembly mode with a fixed upper end and a suspended lower end; and a closed structure is arranged on the tank body. According to the technical scheme, passive, online and quantitative degassing can be realized; andthe slurry is in a closed state in the whole degassing process of a degasser, and the gas collected by a sample gas pump is gas of the slurry removed from the tank body, so that the accuracy of sample gas collection data is guaranteed, and detection on true gas content of stratum can be guaranteed.

Description

technical field [0001] The invention belongs to equipment for comprehensive mud logging and gas logging, and relates to a device for on-line degassing of mud proposed in oil exploration and drilling, and is especially suitable for a passive degassing device, that is, the degasser does not need to be driven by a power source. Background technique [0002] The degassing device is an important part of the comprehensive mud logging and gas logging equipment. It shoulders the important task of whether the sample gas can better represent the real gas content of the formation, and directly affects the accuracy of oil and gas field evaluation. [0003] The industry's research on its improvement has never stopped. [0004] For example, the published Chinese patent "200410059804.5 A system for removing gas from mud and analyzing gas contained in mud" describes a physical and chemical analysis device for gas extracted online from mud proposed in oil exploration drilling, mentioning De...

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Problems solved by technology

[0005] The industry generally believes that the degasser has generally experienced the first generation of degasser: that is, a square metal box is processed into a concave shape at the bottom, and the middle lead-out pipeline is connected to the suction pump. This device floats on the mud page and generally has no power source. , which belongs to a float type degasser, and its degassing efficiency is low

The second-generation degasser is an electric degasser. The motor drives the stirring rod to stir in the degassing barrel. The purpose is to break up the mud and separate the gas in the mud, and then pump the gas to the mud logging room through the sample gas pump. , the degassing efficiency has been improved, but due to the great influence of the change of the liquid level of the mud tank, the mud flow is unstable, and the slurry inlet of the degassing device does not have a good flow limiting measure, so that the mud is easily pumped to the recorder. The well room caused damage to the equipment. For this reason, it is often necessary to adjust the draft of the degasser by raising and lowering it, which affects the operating efficiency.

[0008] According to the different viscosity of the mud to be treated, the requirements for crushing the mud are not the same. Therefore, the energy saving and environmental protection of passive degassing devices are highly valued by the market, but the known technology is not suitable for degassers without power supply. In the source degasser, the degree of mud fragmentation is poor and unstable, and the mud easily forms a vortex in the tank body, which directly affects the degassing efficiency; due to structural reasons, the existing degasser is either not suitable for gas collection, or the gas Poor collection

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