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Injection-production string and well completion method using same

A technology for injection-production strings and oil pipes, applied in the field of oil and gas storage, which can solve problems such as strong heterogeneity, large reservoir thickness, and many faults

Active Publication Date: 2021-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Foreign underground gas storages generally have a buried depth of more than 2000m, with simple structures, thick reservoirs, and good physical properties; Sinopec’s gas reservoirs represented by the Wen 23 gas field have relatively poor geological conditions for construction, with buried depths generally greater than 300m, and many faults , complex structure, rapid change in sedimentary facies, poor reservoir physical properties, strong heterogeneity
[0003] At present, the type of injection-production string is single, which cannot meet the needs of different functions and environments

Method used

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  • Injection-production string and well completion method using same

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing.

[0022] figure 1 An injection-production string 100 according to the invention is shown. Such as figure 1 As shown, the injection-production string 100 includes a normally open safety valve 3 , a gas lift valve 4 , a well flushing valve 5 , a packer 6 , a seating nipple 7 and a liner attachment 8 , which are arranged sequentially through the tubing 1 from top to bottom. . After the completion of the injection-production string 100, it can meet the requirements of multi-frequency gas injection, well shut-in, gas production and workover maintenance of the gas storage, and can also realize reservoir cleaning and reconstruction, dynamic monitoring, emergency shutdown abnormal control, oil casing Pipe anti-corrosion, multi-stage gas lift and other technical purposes, so that multiple production purposes of the gas storage can be achieved through the injection-production string...

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Abstract

The invention provides an injection-production string and a well completion method using the same. The injection-production string comprises a normally open safety valve, a gas lift valve, a well washing valve, a packer, a seating nipple and a tail pipe accessory which are sequentially connected from top to bottom through an oil pipe. The injection-production string has multiple operation functions, and can meet multiple requirements of injection-production operation of a gas storage by one-time investment, the construction process is simplified, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the field of oil and gas storage, and in particular relates to an injection-production pipe string with multiple functions for construction and operation of a gas storage and a well completion method utilizing the same. Background technique [0002] Underground gas storage is the main way of natural gas storage. There are 715 underground gas storages built around the world, with a working gas volume of about 393 billion cubic meters, accounting for 11% of natural gas consumption, mainly distributed in Europe and North America. As the proportion of natural gas in my country's energy consumption increases year by year, underground gas storage has become one of the key links for the safe supply of natural gas in recent years. my country has built 25 underground gas storages, with an effective working gas volume of 11.7 billion cubic meters, accounting for 5% of the country's total consumption. Foreign underground gas storages gen...

Claims

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Application Information

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IPC IPC(8): E21B17/00E21B43/00E21B33/126
CPCE21B17/00E21B43/00E21B33/126
Inventor 何祖清赵金洲何同伊伟锴孙鹏彭汉修
Owner CHINA PETROLEUM & CHEM CORP