Well drilling type oil gas preparing system through gasification and dry distillation of oil shale at normal position and technical method thereof

Abstract

The invention relates to a well drilling type oil gas preparing system through gasification and dry distillation of oil shale at a normal position and a technical method thereof. At least two parallelly arranged directional wells are arranged in an oil shale layer, the horizontal sections of the directional wells are arranged at the bottom of the oil shale layer, an igniting well is respectively arranged between the tail ends of the horizontal sections of the directional wells and the ground, a plurality of auxiliary gasifying wells are arranged between the horizontal sections of the directional wells and the ground, the horizontal sections of the directional wells are arranged between the vertical sections of the directional wells and the igniting wells, and a plurality of oil gas collecting wells are arranged between the gasifying area and the ground. The technological procedure includes: igniting for reverse fire power penetration and expanding a gasification and dry distillation passage; gasifying and dry-distilling the oil shale layer of the gasifying area in positive, negative or fixed point mode; loosening and heating the oil shale layer in a dry distillation area so as to produce cracks on the dry distillation area and generate oil shale oil gas and combustible gas; collecting the oil shale oil gas through an oil gas collecting well; and condensing and separating the oil shale oil gas on the ground surface, thereby obtaining oil shale oil and combustible gas. The well drilling type oil gas preparing system through gasification and dry distillation of the oil shale at the normal position integrates shaft building, oil shale exploitation and ground surface dry distillation oil preparing technology, shortens the production process, is small in investment, high in efficiency and safe and protects the environment.

Description

technical field [0001] The invention belongs to the technical field of oil and gas production from oil shale exploitation, and in particular relates to a drilling type oil shale in-situ gasification and dry distillation oil and gas production system and a process method thereof, which are applied to oil shale in-situ direct gasification and dry distillation production for oil and gas production. Background technique [0002] Shale oil obtained from dry distillation of oil shale can replace petroleum. Over the past 100 years, many methods have been tried to develop oil shale resources, which are mainly divided into two categories: surface retort process and in-situ retort process. The surface dry distillation process is the most widely used. First, the oil shale is mined underground and transported to the ground for crushing. Then it is cracked at high temperature in the dry distillation furnace to generate shale oil. The shale oil is processed and made into raw materials for...

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Problems solved by technology

The surface dry distillation process is the most widely used. First, the oil shale is mined underground and transported to the ground for crushing. Then it is cracked at high temperature in the dry distillation furnace to generate shale oil. The shale oil is processed and made into raw materials for refinery production and high-value products. Chemical products, but this process is difficult to deal with solid waste and shale residue, energy utilization rate, high cost, which affects the development of this industry

The in-situ direct carbonization process does not require mining, but transfers heat to the in-situ oil shale, and breaks part or all of the ore through high-pressure fracturing to improve the conduction and fluid flow capabilities between shales, thereby improving cracking and mining efficiency. However, the traditional in-situ dry distillation process uses different heating methods such as electric power, microwave, high-temperature and high-pressure steam or other gases, and radio frequency to provide external heat sources, that is, to provide energy from the ground to act on oil shale formations to produce shale oil And gas, the external heating process has the disadvantages of long heating cycle, complicated operation, high energy consumption, high cost, etc., and the oil shale is dense and poor in permeability, resulting in a small range of carbonization and unsatisfactory results

Therefore, the current comprehensive utilization cost of oil shale is too high, causing great environmental pollution, and the dry distillation process technology and equipment are not perfect. New technologies are urgently needed to exploit oil shale more reasonably and efficiently.

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