Method of high temperature hydrocarbon gas convection heating oil shale for exploiting oil gas

A hydrocarbon gas and convective heating technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of low heat capacity coefficient of superheated steam, many cycle operations, increased loss and useless work, etc. problems, to achieve the effect of easy industrial application, significant economic benefits, and ease of contradictions

Inactive Publication Date: 2008-02-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-temperature superheated steam still has the following disadvantages as a convective heating fluid: ①The heat capacity coefficient of superheated steam is low, which leads to slow heating of the ore layer, many cycle operations, increased loss and useless work, increased costs, and reduced benefits
②Because some oil shale deposits are located in deserts or Gobi with severe drought and severe water shortage, the water consumption of superheated steam heating is large, which makes this method impossible to implement, or the cost of water is too high, so that the economic benefits of enterprises are very small

Method used

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  • Method of high temperature hydrocarbon gas convection heating oil shale for exploiting oil gas
  • Method of high temperature hydrocarbon gas convection heating oil shale for exploiting oil gas

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Experimental program
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Effect test

Embodiment 1

[0021] As shown in Figures 1 and 2, a method for convectively heating oil shale with high-temperature hydrocarbon gas to exploit oil and gas, in a single oil shale layer with a thickness of 30m and a burial depth of 100m, adopts the present invention to arrange 9 Wells with a well spacing of 100m are distributed in a square grid. Each well is located at the intersection of the square grid.

[0022] The convective heating gas in the embodiment can also use separate methane, ethane, or propane gas.

[0023] Specific steps are as follows:

[0024] 1) Drill wells according to the design and construction. After the drilling construction is completed, select well 5# as the fracturing well, and wells 1, 2, 3, 4, 6, 7, 8, and 9 as the target wells, and use water from well 5# to perform hydraulic fracturing The fissure is connected to the target well, and the 9 wells are connected simultaneously or successively by adjusting and closing the connected target well.

[0025] 2) First sel...

Embodiment 2

[0029] As shown in Figures 1 and 2, a method for convectively heating oil shale with high-temperature hydrocarbon gas to exploit oil and gas, in a single oil shale layer with a thickness of 30m and a burial depth of 100m, adopts the present invention to arrange 9 Wells with a well spacing of 100m are distributed in a square grid. Each well is located at the intersection of the square grid.

[0030] Specific steps are as follows:

[0031] 1) Drill wells according to the design and construction. After the drilling construction is completed, select well 5# as the fracturing well, and wells 1, 2, 3, 4, 6, 7, 8, and 9 as the target wells, and use water from well 5# to perform hydraulic fracturing The fissure is connected to the target well, and the 9 wells are connected simultaneously or successively by adjusting and closing the connected target well.

[0032] 2) First select well 5# as heat injection well 1, shut down the remaining 8 wells, inject propane gas with a temperature o...

Embodiment 3

[0036] As shown in Figures 3 and 4, a method of convectively heating oil shale with high-temperature hydrocarbon gas to extract oil and gas, a certain oil shale ore group contains three layers of oil shale ore layers 3, and the thickness of the oil shale layers from bottom to top is respectively 10m, 25m, 8m, the middle interlayer is sandstone, the thickness is 3m and 4m respectively, the cumulative thickness of this ore group is 43m, the ore-bearing coefficient is 86%, the wells are arranged in an equilateral triangle, the well spacing is 50m, and 11 wells are arranged.

[0037] Drill wells with the method of embodiment 1, each well is drilled into the ore seam 3, and then the casing and flower tubes are lowered. Mining can be implemented.

[0038] Specific steps are as follows:

[0039] 1) Drill wells according to the design and construction. After the drilling construction is completed, select well 6# as the fracturing well, and wells 1, 2, 3, 4, 5, 7, 8, 9, 10, and 11# as...

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Abstract

An oil and gas exploitation method for an oil shale through high-temperature convection-heating of the hydrocarbon gas relates to a mineral exploitation method. The high-temperature overheating water steam convection heating is used by the prior art to exploit oil and gas of an oil shale. As the temperature capacitance coefficient of the high temperature overheating water steam is low, heating of a mineral layer is slow, which increases the cost and reduces the efficiency. Some oil shale deposits are in the desert, and much water is needed by the overheating water steam heating, so the deposits cannot be exploited. The invention uses the hydrocarbon gas as the convection heating fluid. The high temperature hydrocarbon gas is injected into the oil shale along a heat injection well, and the heated mineral layer causes pyrogenation of the kerogen to form oil and gas, which is carried by the low-temperature gas or water along a production well to the ground. After the oil and gas is separated from the water, gas will be separated independently to from the oil and gas product, and the hydrocarbon gas will enter a storage tank to be pressurized and heated to the designed pressure and temperature. Then the hydrocarbon gas will be injected into the oil shale mineral layer for circulating exploitation of oil and gas. Thus, the oil and gas exploitation method for an oil shale through high-temperature convection-heating of the hydrocarbon gas is economical and more convenient for application in the industry.

Description

technical field [0001] The present invention relates to the extraction method of producing oil and gas from underground oil shale layer (containing kerogen), more specifically, relates to a method of utilizing group wells to fracture, using superheated high-temperature pressure hydrocarbon gas to heat the oil shale layer in a convective manner, A method for exploiting oil and gas by thermally decomposing kerogen. Background technique [0002] China has extremely rich oil shale resources. So far, only a very small amount of oil shale has been exploited through open-pit or underground mining of raw ore, and then the oil and gas are obtained through dry distillation in chemical plants; there is still a large amount of oil shale Yanyuan ore is directly used for power generation and combustion. [0003] In 1992, ING Shell Research Co., Ltd. applied for the invention patent of "oil extraction method for heating oil shale" (CN 1016001B) at the Chinese Patent Office. Because the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
Inventor 赵阳升杨栋关克伟刘生玉梁卫国冯增朝康志勤
Owner TAIYUAN UNIV OF TECH
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