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A method for biochar-assisted heating of oil shale to extract shale oil and gas

A shale oil and gas and auxiliary heating technology, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems of long construction period, large energy consumption, environmental pollution, etc., and achieve short production period and environmental protection , the effect of improving the utilization rate

Active Publication Date: 2019-07-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for extracting shale oil and gas by heating oil shale with the aid of biochar to solve the problems of large energy consumption, long construction period, high cost, low efficiency, and environmental pollution in the existing oil shale mining method

Method used

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  • A method for biochar-assisted heating of oil shale to extract shale oil and gas
  • A method for biochar-assisted heating of oil shale to extract shale oil and gas
  • A method for biochar-assisted heating of oil shale to extract shale oil and gas

Examples

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Effect test

Embodiment example 1

[0030] Implementation Case 1: If figure 1 As shown, it is in the form of double wells.

[0031] (1) Drilling and completion stage:

[0032] Step 1, first drill a production well 12 from the surface to the target oil shale layer 4, and artificially create fractures in the production well 12 by hydraulic fracturing to form fractures 3;

[0033] Step 2. Then, centering on the production well 12, another heat injection well 1 is drilled within the fracturing range, and a heat injection channel 5 is formed in the heat injection well 1, and a gas return channel 13 and an oil pumping channel are formed in the production well 12 14;

[0034] Step 3: Press the proppant 16 mixed with a certain proportion of biochar 18 and igniter 17 together with the fracturing fluid into the fracturing fracture 3 while fracturing and creating the fracture, so that it fills the entire fracturing area, and the weight of the proppant 16 is The mixing ratio of igniter 17 and biochar 18 is generally betw...

Embodiment example 2

[0044] Implementation Case 2: If image 3 , Figure 4 and Figure 5 As shown, it is in the form of group wells.

[0045] Step 1. According to the direction and distribution of the oil shale layer 4, determine the specific arrangement of the production well 12 and the heat injection well 1. The heat injection well 1 can be used as the center, and the production well 12 is arranged in a triangle, quadrilateral, hexagon or Circular, etc. are distributed around the heat injection well 1;

[0046] Step 2: Drill several production wells 12 from the surface to the target oil shale layer 4 according to the arrangement, and artificially create fractures in the production wells 12 by means of hydraulic fracturing to form fracturing fractures 3;

[0047] Step 3. Then center on the production well 12 and drill several heat injection wells 1 within the fracturing range according to the arrangement, form heat injection channels 5 in the heat injection wells 1, and form gas return channel...

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Abstract

The invention discloses a method for extracting shale oil and gas biochar-assisted heating of oil shale, which comprises the following steps: first, a gas return passage and an oil pumping passage areformed in a production well; S2, it is ensured that biochar generates enough heat to assist an oil shale in pyrolysis; third, the organic matter inside the oil shale is cracked to produce shale oil and gas under the self-heating effect of the oil shale, wherein one part is carried by the injected hot air to the surface via the production well, and the other part is cooled into liquid and then transferred to the bottom of the production well; and fourth, the shale oil at the bottom of the production well is extracted from the oil pumping passage of the production well through a conventional oil extraction pump. The beneficial effects are as follows: the utilization rate of energy is increased; and the utilization of biochar is expanded, a new way of thinking is provided for the utilizationof biomass waste, the environment is protected, and waste is changed into treasure.

Description

technical field [0001] The invention relates to a method for extracting shale oil and gas, in particular to a method for extracting shale oil and gas by assisting in heating oil shale with biochar. Background technique [0002] At present, the rapid development of the world economy and the continuous deepening of globalization have led to continuous growth in energy demand, but the increasing shortage of conventional fuels has become increasingly prominent. According to the report on the total amount of energy provided by the British company BP, according to the current mining speed, the main primary energy sources such as oil, natural gas and coal on the earth will be exhausted in 40 years, 60 years and 220 years respectively. Oil shale, as an alternative energy source to petroleum, has huge reserves so that it has broad development and application prospects. Its development and utilization can greatly alleviate the current energy shortage problem. [0003] Oil shale is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/247E21B43/267
CPCE21B43/247E21B43/267
Inventor 孙友宏徐绍涛杨秦川郭明义赖城曾剑遥刘素素
Owner JILIN UNIV