Method for mining tight oil reservoir by nanometer fluid

A nano-fluid, dense technology, applied in the fields of fluid extraction, chemical instruments and methods, and earth-moving drilling, can solve the problems of high risk, poor water-flooding development effect, violent flooding, etc., and achieve the effect of improving oil recovery.

Active Publication Date: 2015-05-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the initial stage of depletion-type development, the oil production is generally relatively high, but due to the influence of poor reservoir properties, low formation pressure and small single well controlled reserves, the natural energy is very limited, and the production generally declines rapidly. Industrial oil was obtained by conventional fracturing in the Chang 7 Member The average single-well production test production of the wells that flow is 5.8t/d, while the test production production is only 0.6-0.9t/d
Even with large-scale fracturing of horizontal wells, the primary oil recove

Method used

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  • Method for mining tight oil reservoir by nanometer fluid

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] The tight oil core is placed in the core holder, saturated water is injected first, and then saturated oil is injected to obtain a simulated tight oil reservoir; nanofluid slugs are injected into the simulated tight oil reservoir to drive oil, and then water drive is performed.

[0027] The tight oil core has an inner diameter of 2.54 cm, a length of 5 cm, and a permeability of 0.08 mD. SiO with a particle size of 10nm-30nm in the nanofluid 2 The mass fraction of nanoparticles is 0.05%, the mass fraction of anionic surfactant is 0.1%, the balance is water, the anionic surfactant is sodium petroleum sulfonate, the injection volume of nanofluid is 0.1PV, and the injection rates of nanofluid and water are both It is 1.0m / d.

Example Embodiment

[0028] Example 2

[0029] Place the tight oil core in the core holder, first inject saturated water and then saturated oil to obtain a simulated tight oil reservoir; inject nanofluid slugs into the simulated tight oil reservoir for oil displacement, and then perform water injection and injection Nanofluids alternately drive oil.

[0030] The tight oil core has an inner diameter of 2.54 cm, a length of 5 cm, and a permeability of 0.08 mD. SiO with a particle size of 10nm-30nm in the nanofluid 2 The mass fraction of nanoparticles is 0.05%, the mass fraction of anionic surfactant is 0.1%, the balance is water, the anionic surfactant is sodium petroleum sulfonate, the injection volume of nanofluid is 0.2PV, and the injection speeds of nanofluid and water are both It is 0.8m / d; when water injection and nanofluid injection alternately drive oil, the volume ratio of water and nanofluid is 20:1.

Example Embodiment

[0031] Example 3

[0032] The tight oil core is placed in the core holder, saturated water is injected first, and then saturated oil is injected to obtain a simulated tight oil reservoir; nanofluid slugs are injected into the simulated tight oil reservoir to drive oil, and then water drive is performed.

[0033] The tight oil core has an inner diameter of 2.54 cm, a length of 5 cm, and a permeability of 0.08 mD. SiO with a particle size of 10nm-30nm in the nanofluid 2 The mass fraction of nanoparticles is 0.05%, the mass fraction of anionic surfactant is 0.1%, the balance is water, the anionic surfactant is sodium petroleum sulfonate, the injection volume of nanofluid is 0.3PV, and the injection rates of nanofluid and water are both It is 1.2m / d.

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Abstract

The invention relates to a method for mining a tight oil reservoir by nanometer fluid. The method comprises the following steps that a nanometer fluid segment plug is injected into the tight oil reservoir, then, water is injected into the oil reservoir through an injecting well, and the exploitation is carried out, and the water injecting speed needs to be smaller than 1.4m/d. According to the method provided by the invention, the nanometer fluid segment plug can invert the oil-wet tight oil reservoir into the water-wet reservoir, and the subsequently injected water can enter a substrate in a dialysis way under the effect of capillary force, so that rest oil in the substrate is used. The sudden water flooding due to fast fluid channeling of the injected water along the cracks can be avoided through low-speed water injection, and the stratum energy after the once oil production of the tight oil reservoir can be supplemented through the water injection.

Description

technical field [0001] The invention belongs to the technical field of tight oil reservoir exploitation, and relates to a method for exploiting tight oil reservoirs by nanofluid. Background technique [0002] With the continuous development of oil and gas exploration and development, unconventional oil and gas such as tight gas, shale gas, coalbed methane, and tight oil have shown great potential under the current economic and technological conditions, and global oil and gas resources will usher in a second expansion. Tight oil refers to the oil that occurs in the source rocks in an adsorbed or free state, or interbeds with source rocks, or in tight sandstones, tight carbonate rocks, and other reservoir rocks that have not undergone large-scale long-distance migration. gather. Tight oil reservoirs in my country are characterized by low porosity, low permeability, and low pressure, and their effective development faces many challenges. The oil production of tight oil reserv...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/22E21B43/20C09K8/584
CPCC09K8/584C09K2208/10E21B43/16E21B43/20
Inventor 鹿腾李兆敏李松岩王继乾张兴鲁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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