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Reservoir stimulation method for igneous heavy oil reservoir

A technology for reservoir reconstruction and heavy oil reservoirs, which is applied in the field of petroleum exploitation, can solve problems such as inability to effectively improve formation permeability, impossibility of igneous rock heavy oil reservoir transformation, and unsatisfactory transformation effects, and meet the requirements of crude oil viscosity reduction, Effect of improving formation permeability and widening crude oil flow channel

Active Publication Date: 2021-01-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle is to use chemical viscosity reducer to reduce the viscosity of heavy oil. This technology cannot effectively improve the formation permeability, and the stimulation effect is still unsatisfactory.
[0007] In summary, none of the existing reservoir stimulation methods can effectively stimulate igneous heavy oil reservoirs.

Method used

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  • Reservoir stimulation method for igneous heavy oil reservoir
  • Reservoir stimulation method for igneous heavy oil reservoir
  • Reservoir stimulation method for igneous heavy oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] In this embodiment, reservoir stimulation is performed on Well Zi 101. Well Zi 101 belongs to igneous rock heavy oil reservoir. The wellbore temperature of the well is 50°C to 60°C. The lithology of the well is glassy basalt of igneous rock, without phenocrysts, and the matrix is ​​interstitial structure, with plagioclase microcrystals and glass. The muddy phenomenon on the rock surface is serious, see muddy clumps. The initial conditions of its crude oil are shown in Table 1.

[0086] Table 1. Initial physical property data of crude oil from Well 101

[0087]

[0088] According to the physical properties of the reservoir and crude oil, the autogenous heat viscosity reduction acidification process is adopted, and the specific construction pumping procedures are shown in Table 2. Among them, the self-generating heat solution A is sodium nitrite solution, the self-generating heat solution B is ammonium chloride and hydrochloric acid solution, the chemical huffing a...

Embodiment 2

[0094] In this embodiment, reservoir reconstruction is carried out on Well 103. Well Zi 103 belongs to igneous rock heavy oil reservoir. The wellbore temperature of the well is 50°C to 60°C. The lithology of the well is igneous gray-black oil spot basalt, the rock color is relatively uniform, the composition is mainly plagioclase, rich in lime particles, aphanitic structure, dense and hard; the cuttings are massive. Oil-bearing cuttings account for 2% of the cuttings, and 5-15% of the named cuttings, and the occurrence is spotty. Fluorescence dark yellow under wet and dry light, bright yellow under drip light, uneven appearance, series comparison of 10 grades. The initial conditions of its crude oil are shown in Table 3.

[0095] Table 3 Initial physical property data of crude oil from Well 103

[0096]

[0097] According to the physical properties of the reservoir and crude oil, the autogenous heat viscosity-reducing acidification process is adopted, and the specific c...

Embodiment 3

[0103]In this embodiment, reservoir reconstruction is carried out on Well Jun 101. Well Jun 101 belongs to igneous rock heavy oil reservoir. The wellbore temperature of the well is 50°C to 60°C. The lithology of the well is gray-black oil spot basalt of igneous rock, the rock color is relatively uniform, the composition is mainly plagioclase, rich in lime particles, aphanitic structure, dense and hard; the cuttings are massive. The initial conditions of its crude oil are shown in Table 5.

[0104] Table 5 Initial physical properties data of crude oil in Well Jun 101

[0105]

[0106] According to the physical properties of the reservoir and crude oil, the autogenous heat viscosity-reducing acidification process is adopted, and the specific construction pumping procedures are shown in Table 6. Among them, the self-generating heat solution A is sodium nitrite solution, the self-generating heat solution B is ammonium chloride and hydrochloric acid solution, and the chemical...

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Abstract

The invention discloses a reservoir reconstruction method for igneous rock heavy oil reservoirs, belonging to the technical field of petroleum exploitation. In this reservoir stimulation method, the self-generating solution A and the self-generating solution B are injected into the target formation through the tubing and casing respectively, and the heat released by the reaction of the self-generating solution A and the self-generating solution B is used to reduce the amount of crude oil in the igneous rock heavy oil reservoir. According to the actual situation of igneous heavy oil reservoirs, chemical huff and puff viscosities and acid fluids can be selectively injected into target formations to further reduce crude oil viscosity, improve formation permeability, communicate or extend formation fractures, and widen crude oil flow channels. Adopting the method for improving the reservoir not only satisfies the requirement of reducing the viscosity of crude oil but also achieves the purpose of removing plugging, can effectively transform the igneous rock heavy oil reservoir, and the viscosity reducing rate of crude oil can reach more than 95%.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a reservoir reconstruction method for igneous rock heavy oil reservoirs. Background technique [0002] Igneous rocks are directly solidified from magma, which makes igneous rock reservoirs have different petrological and fluid characteristics from other types of reservoirs, especially igneous heavy oil reservoirs due to their high density, high viscosity, high colloidal bitumen, The characteristics of low wax content and low freezing point have become difficulties in exploration and development. Therefore, it is necessary to transform the igneous rock heavy oil reservoir to improve the development effect of the igneous rock heavy oil reservoir. [0003] At present, the methods for improving igneous heavy oil reservoirs mainly include: [0004] (1) Fracturing technology. The principle of this technology is to use fracturing hydraulic pressure to open the formatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/22
Inventor 王津建蔡晴琴杨太伟程诗睿郭树召杨扬闫钰
Owner PETROCHINA CO LTD
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