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Method for storing crude oil by using low-permeability ultra-low-permeability stratum

A technology of ultra-low permeability and crude oil, which is applied in the direction of chemical instruments and methods, earthwork drilling, and drilling compositions, etc. It can solve problems such as explosion, harsh environment for crude oil storage, and crude oil storage in ultra-low permeability strata that have not been found. , to achieve the effect of improving heterogeneity, facilitating production and expansion, and improving single well production capacity

Active Publication Date: 2020-09-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN208165750U discloses a storage tank that is used for crude oil transportation and is convenient for temperature adjustment, which mainly solves the problem that the storage environment of crude oil is extremely harsh, and the temperature is too high or too low to cause its explosion
[0004] So far, there have been no public reports on the use of low-permeability and ultra-low-permeability formations for crude oil storage

Method used

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  • Method for storing crude oil by using low-permeability ultra-low-permeability stratum
  • Method for storing crude oil by using low-permeability ultra-low-permeability stratum
  • Method for storing crude oil by using low-permeability ultra-low-permeability stratum

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Experimental program
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Effect test

Embodiment 1

[0050] A crude oil-based system is used for crude oil storage, and crude oil with a viscosity of 40 mPas is selected as a solvent. The crude oil-based system is composed of 3% petroleum sulfonate, 1% sodium lauryl carboxylate, and the balance is solvent. The system is under the condition of 100 ℃, the rotation speed is 170s -1 When the shear 1h viscosity is 30mPas.

Embodiment 2

[0052] The crude oil-based system is used for crude oil storage, and crude oil with a viscosity of 50 mPas is selected as a solvent. The crude oil-based system is composed of 4% petroleum sulfonate, 2% calcium lauryl carboxylate, and the balance is solvent. The system is under the condition of 100 ℃, the rotation speed is 170s -1 When the shear 1h viscosity is 40mPas.

Embodiment 3

[0054] Crude oil with a viscosity of 50mPas is selected as the solvent. The mass percent composition of the crude oil-based system is: 5% of petroleum sulfonate, 3% of magnesium dodecyl carboxylate, and the balance is solvent. The system is under the condition of 100℃, and the rotation speed is 170s -1 When the shear 1h viscosity is 50mPas.

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Abstract

The invention relates to a method for storing crude oil by using a low-permeability ultra-low-permeability stratum. The method comprises the steps that the crude oil or a crude oil-based system is injected into the low-permeability ultra-low-permeability stratum through reservoir fracturing, flowback is avoided after fracturing is completed, and crude oil storage or integration of reservoir fracturing and crude oil storage is achieved; the crude oil-based system consists of petroleum sulfonate, a thickening agent and a solvent; and the solvent is the crude oil or a mixture of the crude oil andgasoline, diesel oil, kerosene or condensate oil. According to the method, on the basis of low oil price and low-permeability ultra-low permeability stratum characteristics, the pollution of a systemto a reservoir can be reduced or even eliminated, and the single-well production capacity is improved; after fracturing construction, a well can be duly opened for production according to crude oil consumption requirements, and the function of an underground oil storage depot is achieved.

Description

technical field [0001] The invention relates to a method for storing crude oil by using a low-permeability and ultra-low-permeability formation, and belongs to the technical fields of oil-gas field development engineering and oil-gas storage and transportation engineering. Background technique [0002] At present, governments around the world mainly use surface crude oil storage tanks and underground salt caverns for strategic oil reserves. At the same time, some oil companies use abandoned oil and gas reservoirs to store crude oil or natural gas, and then quickly exploit them in a timely manner to meet market demand. Existing crude oil storage methods require a large amount of investment, and a large amount of daily maintenance work is still required after the construction is completed. In order to ensure the fluidity of crude oil during storage and export and reduce energy loss, CN203170277U provides a crude oil processing and storage and export system. CN208165750U disc...

Claims

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Application Information

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IPC IPC(8): E21F17/16E21B43/26C09K8/64C09K8/82
CPCE21F17/16E21B43/26C09K8/64C09K8/82
Inventor 王彦玲白宝君刘忠华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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