Oil-based drilling waste supercritical treatment system

Abstract

The invention relates to an oil-based drilling waste supercritical treatment system. The oil-based drilling waste supercritical treatment system mainly comprises an extraction unit, a separation unit,an extractant recovery unit and a corresponding control unit. The extraction unit comprises an extraction kettle, an extractant storage tank, a metal diaphragm compressor, an extractant buffer tank,a pre-extraction cooler, a waste storage tank and a screw pump. The separation unit comprises an extraction kettle outlet pipeline switching valve group, a filter, a first-stage pressure reducing valve group, a first-stage separation heater, a first-stage separation kettle, a second-stage pressure reducing valve group, a second-stage separation heater and a second-stage separation kettle; the extractant recovery unit includes a first residual extractant recovery line, a second residual extractant recovery line, an extractant decompression recovery line, and a solute collection line. The systemrealizes the continuous, high-efficient and environmental protection treatment of oil-based drilling waste with high oil content, high water content, high solid content and low fluidity by adjustingand switching the corresponding valves on the pipeline.

Description

technical field [0001] The invention belongs to the technical field of oil-based drilling waste treatment, and in particular relates to a supercritical treatment system for oil-based drilling waste. Background technique [0002] Drilling fluid, also known as drilling mud, is called the "blood" of oil drilling engineering, and its main functions are as follows: [0003] 1. Clean the bottom of the well, suspend and carry cuttings, and keep the wellbore clean; [0004] 2. Balance formation pressure, stabilize well wall, prevent well collapse, blowout and lost circulation; [0005] 3. Transfer water power to help the drill bit break rocks; [0006] 4. Transmitting power for downhole dynamic drilling tools; [0007] 5. Cooling drill bits and drilling tools; [0008] 6. Using drilling fluid for geological and gas logging; [0009] 7. Offshore oil drilling and completion projects, including geology, exploration, cementing, casing running, mud logging, logging, etc., all need t...

AI Technical Summary

Problems solved by technology

[0011] The newly configured drilling mud will have more and more impurities as it is used for a long time, which will cause physical changes, which will cause the "aging" of the mud. The "aging" mud will be processed by solid control equipment, such as dryer + centrifuge A certain degree of regeneration can be obtained after treatment by a machine, etc., but the separated waste and the mud with a deep aging degree still contain a certain amount of oil, generally still greater than 10%, some even reach 20%, and generally contain a certain amount However, such substances are not friendly to the environment. According to the requirements of environmental protection laws and regulations, oil-based waste cannot be discharged directly and needs to be treated. Usually, the treatment methods for such "aging" oil-based mud and waste include thermal analysis. , incineration, chemical cleaning, etc., but these methods have technical defects to a certain extent, for example, basically they will inevitably produce secondary pollution, and they are relatively sensitive air pollutants, and the processed products still exist. environmental incompatible components etc.

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