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Wellhead heating device for supercritical carbon dioxide fracturing of oil and gas wells

A carbon dioxide and heating device technology, which is applied to isolation devices, wellbore/well components, and production fluids, etc., can solve the problems of increasing pipeline modification procedures, large area, and complicated operation, and achieves simple structure, convenient operation, The effect of improving heating efficiency

Active Publication Date: 2022-07-26
四川安硕石油工程技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method increases the pipeline modification process, occupies a large area, and is cumbersome to operate

Method used

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  • Wellhead heating device for supercritical carbon dioxide fracturing of oil and gas wells
  • Wellhead heating device for supercritical carbon dioxide fracturing of oil and gas wells
  • Wellhead heating device for supercritical carbon dioxide fracturing of oil and gas wells

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This embodiment provides a wellhead heating device for supercritical carbon dioxide fracturing of oil and gas wells, including a casing 1 and a heating mechanism, the heating mechanism includes a preheating assembly 2 and a heating assembly 3, and the casing 1 adopts a pressure-resistant cylindrical structure.

[0039]The preheating assembly 2 includes an isolation cylinder I21, the isolation cylinder I21 adopts a pressure-resistant cylindrical structure, the isolation cylinder I21 is coaxially arranged in the casing 1, and the annular chamber between the outer wall of the isolation cylinder I21 and the inner wall of the casing 1 serves as a preheating chamber twenty two.

[0040] The heating assembly 3 includes a rotating shaft 31, a reversing baffle plate 32 and an electric heating element 33; the rotating shaft 31 is rotatably installed in the casing 1 through a connecting piece, and the axis of the rotating shaft 31 coincides with the axis of the casing 1; The plate...

Embodiment 2

[0044] This embodiment provides a wellhead heating device for supercritical carbon dioxide fracturing of oil and gas wells, which is further improved on the basis of Embodiment 1. The preheating assembly 2 is provided with an inlet and an outlet 23; The inlet port 4 on the upper part is connected; the diameter of the outlet 23 is smaller than the inner diameter of the preheating chamber 22 . The direction of the output airflow from the outlet 23 faces between two adjacent reversing baffles 32 , preferably, the direction of the output airflow faces between two adjacent reversing baffles 32 , and is biased toward a certain reversing baffle 32 .

[0045] CO pressurized by fracturing pump truck 2 The fluid enters the preheating chamber 22 through the air inlet port 4 through the pipeline, is preheated in the preheating chamber 22 , and then enters the casing 1 through the outlet 23 . The diameter of the designed outlet 23 is smaller than the inner diameter of the preheating chamb...

Embodiment 3

[0047] This embodiment provides a wellhead heating device for supercritical carbon dioxide fracturing of oil and gas wells, which is further improved on the basis of Embodiment 2. The plurality of reversing baffles 32 are evenly distributed at equal intervals along the circumference of the rotating shaft 31 . Each reversing baffle 32 corresponds to a plurality of electric heating elements 33 , the first electric heating element 33 is installed on the side wall of the reversing baffle 32 , and the remaining electric heating elements 33 are adjacent to each other and extend in a direction away from the rotating shaft 31 in sequence. , and the adjacent electric heating elements 33 are detachably connected. The structure of each electric heating element 33 is the same, and the following design is adopted: the electric heating element 33 includes an upper support 331, a lower support 332 and an electric heater 333;

[0048] The upper support 331 and the lower support 332 are arrang...

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Abstract

The invention discloses a wellhead heating device for supercritical carbon dioxide fracturing of oil and gas wells, comprising a casing and a heating mechanism, wherein the heating mechanism includes a preheating assembly and a heating assembly; The cylinder I is coaxially arranged in the casing, and the annular chamber between the outer wall of the isolation cylinder I and the inner wall of the casing is used as a preheating chamber; the heating assembly includes a rotating shaft, a reversing baffle plate and an electric heating element; the rotating shaft passes through the connecting piece It is rotatably installed in the casing, and the axis of the rotating shaft coincides with the axis of the casing; a plurality of reversing baffles are distributed along the circumference of the rotating shaft, and the surface of the reversing baffle is used for laying electric heating elements; the end of the reversing baffle is far from the rotating shaft The electric heating element is extended; the heating temperature of the electric heating element is lower than the heating temperature of the electric heating element. The main idea of ​​the present invention is to increase the CO in the heating device by increasing 2 Fluid disturbance to improve heating efficiency.

Description

technical field [0001] The invention relates to the technical field of oil and gas stimulation equipment, in particular to a wellhead heating device for supercritical carbon dioxide fracturing of oil and gas wells. Background technique [0002] from CO 2 It can be seen from the phase diagram of the fluid that when the temperature reaches 31.3 °C and the pressure exceeds 7.39 MPa, the CO 2 The fluid is in a supercritical state. supercritical CO 2 Fluids differ from both liquids and gases in that they have many unique physicochemical properties. supercritical CO 2 The density is close to that of liquid, the viscosity is close to that of gas, and the diffusion coefficient is high, the surface tension is close to zero, and it has strong permeability and good heat and mass transfer performance. Utilize supercritical CO 2 Fracturing reservoirs with fluids can avoid a series of problems caused by traditional fracturing fluids. [0003] supercritical CO 2 In the process of f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B36/04E21B43/26
CPCE21B36/04E21B43/2605E21B43/2607
Inventor 安耀清时际明王志兴许云春于思想牛庆华蔡为立
Owner 四川安硕石油工程技术服务有限公司
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