Method and process for extracting shale oil and gas by fracturing and chemical retorting in oil shale in-situ vertical well

a technology of oil shale and vertical well, which is applied in the direction of fluid removal, borehole/well accessories, insulation, etc., can solve the problems of large excavation cost of on-ground retorting, secondary pollution, and difficulty in treatment, and achieves small environmental pollution, low operating cost, and small investment

Inactive Publication Date: 2016-03-10
JILIN ZHONGCHENG AUTOMOTIVE SERVICE CHAIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022]vi). pumping crosslinked carbamidine gel and sand (at a rate of 20-30: 40-60), to enhance an expansion strength;
[0040]The shale oil is extracted in in-situ underground oil shale by a chemical heat treatment process of fracturing and chemical retorting the shale oil and gas, which avoids bulk exploitation of oil shale mine and averts environmental pollution brought by on-ground retorting. Secondly, underground continuous retorting is achieved by utilizing a sphaltenes and fixed carbon remained in the oil shale after being retorted, accordingly, the heat is self-sufficient. Thirdly, the chemical heat treatment process is neither a single physical heating process nor an underground spontaneous combustion process, pores in the rock are gradually increased during the course of reaction, and, it is suitable for most oil shale strata. The present invention has advantages of small investments, low operating costs, small environmental pollutions, high resource utilization rate, and fast yields of oil and gas, etc..

Problems solved by technology

The on-ground retorting has large excavation cost.2).
The tailings resulted from the on-ground retorting are difficult to be treated, and its bulk accumulation causes secondary pollution.5).
The tailings resulted from the on-ground retorting carry away lots of heat so that heat from the tailings is unavailable, which results in energy waste.6).
Waste gas and sewage obtained from the on-ground retorting causes excessive pollution of the environment.
Secondly, underground continuous retorting is achieved by utilizing a sphaltenes and fixed carbon remained in the oil shale after being retorted, accordingly, the heat is self-sufficient.

Method used

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  • Method and process for extracting shale oil and gas by fracturing and chemical retorting in oil shale in-situ vertical well
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  • Method and process for extracting shale oil and gas by fracturing and chemical retorting in oil shale in-situ vertical well

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embodiment 1

[0047]Fuyu-Changchun Mountain Oil Shale Mine, in which a total reserves is of 45.274 billion tons, is taken as an implementation base. The oil shale has an average grade of 5.53%, an industrially developable resources total amount of 18 billions, an embedded depth of 160-800 meters with top and bottom strata of mousey shale, and an average thickness of 5 meters.

[0048]As shown in FIG. 1, depending on distribution and strike of an oil shale stratum, specific locations of a fractured burning well and export production wells are selected, a fractured burning well 1 (a head of which has a diameter of 200 mm) and six export production wells 2 (a head of each of which has a diameter of 200 mm) are drilled from a underground rock stratum 7 to a underground oil shale stratum 6 (which is distanced from the ground at 380 meters). As shown in FIG. 2, the six export production wells 2 are distributed in a honeycombed manner around the fractured burning well 1 as a center. The fractured burning w...

embodiment 2

[0069]Qiangguo Oil Shale Mine, in which a total mining area is of 675.5 km2, the total resources is of 6.172 billion tons and the exploitable total resources is of 4.94 billion tons, is taken as an implementation base. The oil shale has an average grade of 5%, an embedded depth of 160-800 meters with top and bottom strata of mousey shale, and an average thickness of 6 meters.

[0070]As shown in FIG. 1, depending on distribution and strike of an oil shale stratum, specific locations of a fractured burning well 1 and export production wells 2 are selected, a fractured burning well 1 (a head of which has a diameter of 200 mm) and six export production wells 2 (a head of each of which has a diameter of 200 mm) are drilled from a underground rock stratum 7 to a underground oil shale stratum 6 (which is distanced from the ground at 380 meters). As shown in FIG. 2, the six export production wells 2 are distributed in a honeycombed manner around the fractured burning well 1 as a center. The f...

embodiment 3

[0091]Referring to FIG. 3, there discloses a hydraulic casing nozzle involved in embodiments 1 and 2, it mainly comprises an upper centralizer 16, an ejection gun 17, a check valve 19, a lower centralizer 20, a screen pipe 22, a guide shoe 23, a casing 23 and a nipple 24, wherein a surface of the ejection gun 17 is provided with an ejection nozzle 18, the ejection nozzle 17 has one end communicated with the casing 23 by a nipple 24 and the other end communicated with the screen pipe 21 by the check valve 19, an outside of the nipple 24 is cased with the upper centralizer 16, pipe wall of the screen pipe 21 is uniformly distributed with several screen meshes, the lower centralizer 20 is cased over the screen pipe 21, and, the guide shoe 22 is secured to a top of the screen pipe 21.

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Abstract

The present invention provides a method and a process for extracting shale oil and gas by fracturing and chemical retorting oil shale in in-situ vertical well. A vertical well (1) is drilled towards an underground oil shale stratum (6) and a highly pressurized medium is injected into the oil shale stratum. Cracks of 1 to 3 mm are fractured out in the oil shale stratum with the well serving as a center and are filed with gap fillers, so that oil gas passages (8) are established. Then, a heating apparatus is added into the oil shale stratum to heat the oil shale stratum to 550° C., the oil shale is initially retorted, the shale oil and gas are extracted, and the shale oil and gas are led out of the ground via the oil and gas channel. After that, an oxidizer is introduced for oxidization reaction with a sphaltenes and fixed carbon contained in the oil shale after being retorted, where the heat generated is used as a heat source for subsequent retorting, thus achieving underground in-situ shale oil extraction. This solves the problem that existing ground-level retorting has in terms of large recovery costs, difficult treatment of tailings, a variety of environmental issues, and large land-use footprint.

Description

BACKGROUND[0001]1. Technical Field[0002]The present invention discloses a method and a process for extracting shale oil and gas by fracturing and chemical retorting oil shale in in-situ vertical well, in which shale oil is extracted in in-situ underground oil shale and is served as unconventional oil and gas energy for making up shortage of petroleum resources, and which belong to a technical field of retorting of petroleum.[0003]2. Description of the Related Art[0004]At present, shale oil (artificial petroleum), which is used to substitute for naturally occurring petroleum, may be refined from shale oil by virtue of retorting technology, and is also used for electricity generation by utilizing combustion thereof. Under the current situation that price of the oil keeps high, shale oil refining has good economic benefits and is a most realistic available measure to make up shortage of naturally occurring petroleum. Electricity generation by oil shale has good economic, environmental ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B43/243E21B43/26E21B43/267E21B43/34
CPCE21B43/243E21B43/34E21B43/267E21B43/26E21B43/247E21B43/114E21B43/2607
Inventor ZHAO, JINMIN
Owner JILIN ZHONGCHENG AUTOMOTIVE SERVICE CHAIN
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