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Salt cavern type gas storage cavity construction process oil-water interface detection method

A technology of oil-water interface and detection method, which is applied in the direction of displaying liquid level indicators through pressure measurement, can solve the problems of heavy workload, damage to cable armor and armor, and heavy workload, so as to simplify the process of measures and avoid cable damage or damage to the instrument, avoiding the effect of the process

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology must connect the detection sensor through 3 to 5-core armored cables, and the armored cables are bound with cable fixing clips on each intermediate pipe to go downhole. May be damaged, affecting the detection success rate
In addition, when using this technology, if the depth of the designed oil-water interface needs to be changed or the downhole detection sensor is damaged, the center pipe must be pulled out and the detection sensor re-down to the target depth. The workload is heavy and the construction steps of the measures are cumbersome

Method used

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  • Salt cavern type gas storage cavity construction process oil-water interface detection method
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  • Salt cavern type gas storage cavity construction process oil-water interface detection method

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with accompanying drawing.

[0043] This embodiment provides a method for detecting the oil-water interface in the cavity-building process of a salt-cavern gas storage, which includes the following steps:

[0044] Step 1. First, install a high-precision pressure gauge and a density gauge 5 at the gate of the oil injection pipe 1 of the wellhead device (such as figure 1 shown), used to test the wellhead pressure P of the oil injection pipe O and density value ρ O , respectively install a high-precision pressure gauge and a density gauge 4 at the gate of the brine extraction pipe 2 to test the wellhead pressure P of the brine extraction pipe L and density value

[0045] ρ L ;

[0046] Step 2. Turn off the water injection pump, and at the same time close the gates of oil injection pipe 1, brine extraction pipe 2 and water injection pipe 3, and let it stand for 30 minutes to stabilize the liquid press...

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Abstract

The invention discloses a salt cavern type gas storage cavity construction process oil-water interface detection method which includes the steps: mounting a high-precision pressure meter and a density meter on a wellhead; respectively measuring the wellhead pressure and the liquid density of a brine mining pipe and an oil filling pipe; substituting measured data into a calculation formula derived according to equivalent 'U'-shaped pipe model construction, and performing oil-water interface calculation to obtain the real depth of an oil-water interface. By the detection method, a downhole tripped detection instrument is omitted, construction risks caused by cable damage or instrument damage in the tripping process are avoided, measure process is simplified, and the complicated technological process of tripping a string again in change of the design depth of the oil-water interface is avoided.

Description

technical field [0001] The invention relates to the fields of salt mine mining and salt rock solution cavity utilization, in particular to a method for detecting the oil-water interface in the process of cavity-building of a salt-cavern type gas storage. Background technique [0002] The salt cavern construction process is actually a process of water-soluble brine extraction. Water is pumped into the salt layer through the cavity-making string, and after the salt is dissolved, it is pumped from the underground to the ground for treatment or utilization; after long-term continuous circulation, the more dissolved salt is More and more, the cavities formed in the salt layer are also getting bigger and bigger, and finally meet the design requirements of the gas storage. At present, there are mainly three types of well types used in the construction of salt cavern gas storage in the world: [0003] (1) Single well and single cavity, that is, a well is drilled in the salt layer, ...

Claims

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Application Information

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IPC IPC(8): G01F23/14
Inventor 王宇琦赵忠建赵立帅孙晓朝梁辰
Owner CHINA PETROLEUM & CHEM CORP
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