Reservoir transformation method for igneous rock thickened oil reservoir

A technology for reservoir stimulation and heavy oil reservoirs, applied in the field of oil exploitation, can solve the problems of inability to effectively improve formation permeability, unsatisfactory stimulation effect, and inability to transform igneous rock heavy oil reservoirs, etc., to meet the requirements of crude oil viscosity reduction, The effect of improving formation permeability and widening crude oil flow channels

Active Publication Date: 2019-05-21
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Reservoir transformation method for igneous rock thickened oil reservoir
  • Reservoir transformation method for igneous rock thickened oil reservoir
  • Reservoir transformation method for igneous rock thickened oil reservoir

Examples

Experimental program
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Example Embodiment

[0084] Example 1

[0085] In this example, the reservoir reconstruction of Well Zi101 was performed. Well Zi 101 belongs to igneous rock heavy oil reservoir. The wellbore temperature of this well is 50℃~60℃. The lithology of this well is igneous rock glass-based basalt, the rock has no phenocrysts, and the matrix is ​​an invisible structure with plagioclase microcrystals and vitreous. The muddy phenomenon on the rock surface is serious, with mud masses. The initial situation of its crude oil is 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 and acidification process is adopted. The specific construction pump injection procedure is shown in Table 2. Among them, autogenous heat solution A is sodium nitrite solution, autogenous heat solution B is ammonium chloride and hydrochloric acid solution, chemical huff an...

Example Embodiment

[0093] Example 2

[0094] In this embodiment, the reservoir reformation of Well Zi103 is carried out. Zi103 well belongs to igneous rock heavy oil reservoir. The wellbore temperature of this well is 50℃~60℃. The lithology of the well is igneous rock gray-black oil-porphyry basalt, the rock is relatively uniform, and the composition is mainly plagioclase, rich in gray particles, cryptocrystalline structure, compact and hard; the rock fragments are massive. Oil-bearing cuttings occupies 2% of cuttings and 5-15% of named cuttings, with speckled occurrence. Fluorescence wet and dry light dark yellow, drip light yellow, uneven appearance, series contrast 10 levels. The initial situation of its crude oil is 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, an autogenous heat generation and viscosity reduction acidification process is adopted. The specific c...

Example Embodiment

[0102] Example 3

[0103] In this example, the reservoir of Well Jun 101 was modified. Well Jun 101 belongs to igneous rock heavy oil reservoir. The wellbore temperature of this well is 50℃~60℃. The lithology of the well is igneous rock gray-black oil-porphyry basalt, the rock is relatively uniform, and the composition is mainly plagioclase, rich in gray particles, cryptocrystalline structure, compact and hard; the rock fragments are massive. The initial situation of its crude oil is shown in Table 5.

[0104] Table 5 Initial physical property data of crude oil from Well Jun 101

[0105]

[0106] According to the physical properties of the reservoir and crude oil, the autogenous heat generation and viscosity reduction acidification process is adopted. The specific construction pump injection procedure is shown in Table 6. Among them, the autogenous heat solution A is a sodium nitrite solution, the autogenous heat solution B is a solution of ammonium chloride and hydrochloric acid...

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Abstract

The invention discloses a reservoir transformation method for an igneous rock thickened oil reservoir, and belongs to the technical field of oil exploitation. The reservoir transformation method comprises the steps of respectively injecting a self-heating solution A and a self-heating solution B into a target stratum through an oil pipe and a sleeve, so as to reduce the viscosity of crude oil in the igneous rock thickened oil reservoir by utilizing heat released by reaction of the self-heating solution A and the self-heating solution B; and selectively injecting chemical huff and puff viscosity reduction fluid and acid liquor into the target stratum according to the actual situation of the igneous rock thickened oil reservoir, so as to further reduce the viscosity of crude oil, improve thestratum permeability, achieve communication or prolonging of stratum cracks, and widen a crude oil flowing channel. By the adoption of the reservoir transformation method, the crude oil viscosity reduction requirement is met, the purpose of unblocking is achieved, the igneous rock heavy oil reservoir can be effectively transformed, and the crude oil viscosity reduction rate can reach 95% or more.

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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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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