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A system and method for batch drilling and rolling well group to exploit natural gas hydrate

A technology for hydrate and natural gas, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of low output, poor economy, short duration, etc., to improve economic benefits, reduce daily costs, improve The effect of drilling rate

Active Publication Date: 2021-04-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies of the existing technology, especially the problems of low output, short duration and poor economy in the existing natural gas hydrate exploitation process, the present invention proposes a system and method for exploiting natural gas hydrate by batch drilling and rolling well group

Method used

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  • A system and method for batch drilling and rolling well group to exploit natural gas hydrate
  • A system and method for batch drilling and rolling well group to exploit natural gas hydrate
  • A system and method for batch drilling and rolling well group to exploit natural gas hydrate

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Such as figure 2 As shown, a system for batch drilling and rolling well group exploitation of natural gas hydrate, the system includes a well group acquisition device and a data control device;

[0055] The well group acquisition device includes an underwater pipeline network 15, a main gas pipeline 16, an offshore floating production storage unit (FPSO) 17, 5 detachable interfaces 12, 5 first electric submersible pumps 10, and 5 first electric submersible pumps. Two electric submersible pumps 11; the underwater pipe network 15 includes 5 branches, each branch is provided with a control valve 13 and a flow meter 14, and each branch of the underwater pipe network 15 is connected with a detachable interface 12; The underwater pipeline network 15 is connected to an offshore floating production storage unit (FPSO) 17 through a main gas pipeline 16; The position of 5m from the end point of the flat well section.

[0056] Described data control device comprises optical cab...

Embodiment 2

[0060] A system for exploiting natural gas hydrate by batch drilling rolling well group, its structure is as described in Embodiment 1, the difference is that the first electric submersible pump 10 and the second electric submersible pump 11 are respectively located in the middle of the horizontal well section. The position of 10m from the end point of the flat well section.

Embodiment 3

[0062] A method for exploiting natural gas hydrate by batch drilling and rolling well group, comprising the following steps:

[0063] (1) Carry out identification of gas hydrate enrichment areas and evaluation of methane reserves in gas hydrate reservoirs, then conduct economic evaluation, select production blocks and determine the total number of well groups for drilling;

[0064] Firstly, the gas hydrate drilling work in the sea area is carried out, with the help of 3D seismic reflection technology, the shallow seabed gas hydrate reservoirs are identified according to the Bottom Simulating Reflector (BSR) in the seismic data; the BSR of the seismic section is picked up to identify Describe the distribution range of gas hydrate, delineate the gas hydrate saturation > 30%, reservoir thickness > 10m, methane reserves > 10 8 m 3 The area is the gas hydrate enrichment area.

[0065] The methane storage in gas hydrate reservoirs is calculated as follows:

[0066] V=A·ΔZ·φ·H·E (...

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Abstract

The present invention provides a system and method for exploiting natural gas hydrate by batch drilling and rolling well group. The system includes a collection device and a data control device; Evaluation of methane reserves in natural gas hydrate reservoirs, followed by economic evaluation, selection of production blocks and determination of the number of wells to be drilled; (2) batch drilling of double-horizontal wells; (3) fracturing to increase production and sand control Stable production; (4) Rolling well group mining, adopting the well group mining method with multiple well groups side by side, establishing a shared underwater production pipeline network for multiple well groups, and adopting the mode of mining while drilling to realize rolling development. The method of the invention can effectively reduce the cost of natural gas hydrate drilling and exploitation, effectively increase and stabilize the output of natural gas hydrate exploitation, prolong the exploitation life, help to improve the economic benefits of natural gas hydrate exploitation, and provide guarantee for realizing commercial exploitation of natural gas hydrate.

Description

technical field [0001] The invention relates to a system and method for exploiting natural gas hydrate by batch drilling and rolling well group, and belongs to the technical field of natural gas hydrate exploitation in sea areas. Background technique [0002] The world's energy structure is shifting towards low carbonization, and the proportion of natural gas in the world's primary energy is increasing year by year. The International Energy Agency predicts that natural gas will replace coal in 2030 and become the second largest energy source after oil. The carbon equivalent of global natural gas hydrate is about twice that of other fossil energy sources combined, and it is likely to be an important source of natural gas in the future. The amount of natural gas hydrate resources in my country's sea area is about 80 billion tons of oil equivalent, which has broad development prospects. Accelerating the realization of its commercial exploitation is the key to seize the strateg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/01E21B43/013E21B43/30
CPCE21B43/01E21B43/013E21B43/305
Inventor 张剑波王志远孙宝江张淑霞潘少伟付玮琪廖友强刘徽
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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