Injection-production gas well variable-diameter well completion method and injection-production string

A technology of injection-production tubing string and gas injection-production, which is applied to wellbore/well components, drill pipe, casing, etc., to achieve the effect of reducing the construction cost and improving the service life

Active Publication Date: 2015-09-09
PETROCHINA CO LTD
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Problems solved by technology

[0007] In order to solve the above-mentioned problems in the completion technology of injection and production gas wells in the existing oil field gas storage depots, the present invention provides a method for completion of injection and production gas wells with variable diameter and injection and production strings. The injection and production gas wells The variable-diameter well completion method can meet the requirements of low injection volume in the early stage of gas drive without re-drilling the well, and can also complete the demand for high injection volume in the later stage of gas injection and production.

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  • Injection-production gas well variable-diameter well completion method and injection-production string

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[0029] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0030] A method for variable-diameter completion of an injection-production gas well, comprising the following steps:

[0031] Step 1. Install the casing for well completion in the well. The casing includes an upper casing 1 and a lower casing 2 connected sequentially from top to bottom. The outer diameter of the upper casing 1 is larger than the outer diameter of the lower casing 2 , the flow area in the upper casing 1 is larger than the flow area in the lower casing 2;

[0032] Step 2: Run a thinner first injection-production string into the casing during the gas drive production stage, such as figure 1 shown;

[0033] Step 3: Take out the first injection-production string from the casing ...

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Abstract

The invention provides an injection-production gas well variable-diameter well completion method and an injection-production string. The method includes the steps: firstly, mounting an upper casing (1) and a lower casing (2) for well completion in a well; secondly, tripping a first injection-production string into the casings at a gas-drive oil production stage; thirdly, taking out the first injection-production string from the casings and then tripping a second injection-production string into the casings at a gas storage stage. The external diameter of the upper casing (1) is larger than that of the lower casing (2), and the external diameter of an oil tube used in the second injection-production string is larger than that of an oil tube used in the first injection-production string. Without drilling the well again, the requirement of gas-drive early low injection allocation rate can be met, and the requirement of high injection allocation rate at a later injection-production stage can also be met.

Description

technical field [0001] The present invention relates to the technical field of completion of gas injection and production wells in oil field gas storage, in particular to a method for completion of variable diameter wells for injection and production gas wells, and an injection production pipe used in the method for completion of variable diameter wells for injection and production gas wells column. Background technique [0002] When non-depleted oil and gas reservoirs are reconstructed into gas storage, it is often divided into two stages: the first stage is the stage of gas flooding oil production. The investment cost is generally designed with small-sized casing first, and equipped with smaller-sized gas injection production and completion strings to ensure gas injection; the second stage is the gas storage stage. In order to meet the needs of emergency peak regulation, the general design adopts large The size of the casing, and the larger size of the gas injection and p...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B17/00
Inventor 贺梦琦曲绍刚孙振宇马振柏明星王玲赵吉成马威王昕伊宏亮杨昕刘德英
Owner PETROCHINA CO LTD
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