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A downhole in-situ fluid microwave electric heating method and microwave electric heater

A heater and electric heating technology applied in the field of oil shale to achieve the effects of energy saving, high heating efficiency and simple method

Active Publication Date: 2019-05-31
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the heating problems existing in the existing oil shale mining process, and to provide a downhole in-situ fluid microwave electric heating method and its microwave electric heater

Method used

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  • A downhole in-situ fluid microwave electric heating method and microwave electric heater
  • A downhole in-situ fluid microwave electric heating method and microwave electric heater
  • A downhole in-situ fluid microwave electric heating method and microwave electric heater

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Experimental program
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Effect test

Embodiment 1

[0043] see Figure 5 As shown, the burial depth of oil shale in a certain place is 380 meters, and the layer thickness is 10 meters. The critical water extraction method is used for in-situ mining. First, two vertical wells are drilled, and the two vertical wells are the first vertical well 201 and the second vertical well 202, the depth is 395 meters, the diameter of the last stage casing is Φ219, the first vertical well 201 is used as the injection well, the second vertical well 202 is used as the production well, and the first vertical well 202 is used as the production well. The vertical well 201 is perforated, and the oil shale formation 205 is fractured to generate horizontal fractures 203, so that the bottom of the first vertical well 201 and the second vertical well 202 are connected;

[0044] Connect the microwave downhole heater 1 with the fluid injection string 116, and connect the high-voltage and high-frequency wire 109, and connect the high-shield signal wire 110...

Embodiment 2

[0047] see Figure 5 As shown, the burial depth of oil shale in a certain place is 100 meters, and the layer thickness is 12 meters. The steam heating method is used for in-situ mining. First, two vertical wells are drilled. The two vertical wells are the first vertical well 201 and the first vertical well 201. The second vertical well 202 has a depth of 117 meters, and the diameter of the last-stage casing is Φ168. The first vertical well 201 is used as an injection well, and the second vertical well 202 is used as a production well. 201 is perforated, and the oil shale formation 205 is fractured to generate horizontal fractures 203, so that the bottoms of the first vertical well 201 and the second vertical well 202 are connected.

[0048] Connect the microwave downhole heater 1 to the steam injection string 116, and connect the high-voltage and high-frequency wire 109, and connect the high-shield signal wire to the bottom of the first vertical well 201. The packer 115 is in ...

Embodiment 3

[0051] see Figure 6 and Figure 7 As shown, the mineral salt components in a certain place are mainly Na2CO3 and K2CO3. The burial depth is 500 meters and the layer thickness is 50 meters. The in-situ solution mining method is used for mining. Firstly, two horizontal wells are drilled, and the two horizontal wells are the first horizontal well. 301 and the second horizontal well 302 have a well spacing of 150m. A vertical well 303 is drilled at the end of the horizontal well to communicate with each other. The length of the horizontal section is 1000m. The depth of 302 is 530m, and the diameter of the last casing is Φ244. The microwave downhole heater 1 is connected to the fluid injection string 116, and the high-voltage and high-frequency wire 109 is connected, and the high-shielding signal wire 110 is connected to the heating well. bottom, the packer 115 seals between the heater isolation zone and the overlying bedrock formation 204, and seals the wellhead;

[0052] First...

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Abstract

The invention discloses an underground in-situ fluid microwave electric heating method and microwave electric heater. As microwave heated water is underground critical water, water introduced into the ground is heated at a target layer, the water in the underground high pressure environment can be heated to a critical state, oil shale is thus cracked to produce oil gas, the oil gas is dissolved into the near-critical water, and the near-critical water is circulated to the surface via a circulating system and separated to obtain an oil gas product. The method is simple, energy-saving, high in exploitation efficiency, high in heating speed and heating efficiency and low in thermal inertia, has a catalytic effect on chemical reaction, is low in loss of heat transferred to the well bottom, reduces the exploitation cost and improves the energy exploitation rate.

Description

technical field [0001] The invention relates to the field of oil shale, in particular to a downhole in-situ fluid microwave electric heating method and a microwave electric heater thereof. Background technique [0002] The main technical feature of various oil shale in-situ mining methods proposed in the world at present is to conduct underground in-situ heating on oil shale to crack kerogen to generate oil and gas. The heating technologies include resistance heating, microwave heating, radio frequency heating, thermal Air heating, three-dimensional heating, etc. my country's oil shale resources are rich, but most of them are low-grade and buried deep. The cracked air combustion technology has carried out a demonstration project. [0003] Patent CN101871339A discloses a method for underground in-situ extraction of hydrocarbons in oil shale. Water and inert gas steam are injected into the working well to form a microenvironment of near-critical water, and shale oil is cracked ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/241E21B36/04E21B43/26
CPCE21B36/04E21B43/2405E21B43/241E21B43/26
Inventor 白文翔郭威孙中瑾孙友宏李强刘世畅韩婧李家晟赵帅周科吕世东
Owner JILIN UNIV