A method for in-situ heat injection and layered extraction of oil and gas in thick oil shale beds

Abstract

The invention provides an oil gas slice mining method through in-situ heat injection in an oil shale thick ore bed, relates to an oil shale in-situ heat injection mining technology, and solves the problems of steam supply quantity insufficiency and ore bed heating non-uniformity occurring when a conventional full-thick-section in-situ heat injection mining is used in the oil shale thick ore bed. The method comprises the following steps of 1, connecting a plurality of vacuum corrugated casing pipes by an annular blind plate; winding a heat insulation material in an annular gap formed between two sleeved metal corrugated pipes, and then performing vacuum pumping; putting the component into an oil shale ore bed section in an open hole well; and injecting cement for forming a cement ring; 2, performing lower section perforation; 3, performing lower section hydraulic fracturing; 4, performing lower section steam injection and oil gas mining; 5, performing grouting sealing in the lower section vacuum corrugated casing pipes; and 6, sequentially circulating the step 1 to the step 5, and performing steam injection on other sectional oil shale ore bodies of the ore bed from bottom to top for mining the oil gas. The oil gas slice mining method is used for oil gas mining through in-situ heat injection in the thick and ultra-thick oil shale ore bed, and has the advantages that the steam supply quantity is sufficient; the heating of the thick ore bed is uniform; the heat loss is small; and the oil gas mining rate is high.

Description

technical field [0001] The invention belongs to the technical field of in-situ heat injection mining of oil shale, and specifically relates to a method for in-situ heat injection layered extraction of oil and gas in thick and extra-thick oil shale layers. Background technique [0002] As we all know, the main pyrolysis temperature range of organic matter in oil shale is 300-500°C, so to completely convert the organic matter in oil shale into shale oil and pyrolysis gas, the oil shale must be heated to above 500°C , which is the primary condition that must be met in all methods of heating oil shale to develop oil and gas resources. [0003] ZL200510012473.4 discloses a "method for convective heating of oil shale to recover oil and gas", and ZL201310057719.4 discloses "a method for in-situ recovery of oil shale oil and gas resources". It is: Arranging and constructing group wells on the ground, drilling into the oil shale layer for treatment, casing cementing, and using group...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a method for extracting oil and gas by in-situ heat injection in layers in thick oil shale layers, and to solve the problem of using traditional full-thick in-situ heat injection in thick and extra-thick oil shale layers. Not only will there be insufficient steam supply and uneven heating of thick ore beds, but it will also lead to technical problems that are difficult to recover a large amount of oil and gas resources.

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