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Method for cracking strata with organic materials to improve recovery ratio of adjacent oil-bearing reservoir stratum

A technology of organic matter and recovery rate, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc. It can solve the problems that do not involve light hydrocarbons and CO2, and achieve strong controllability

Active Publication Date: 2019-02-12
安蔓页岩技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent does not address light hydrocarbons and CO 2 use of

Method used

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  • Method for cracking strata with organic materials to improve recovery ratio of adjacent oil-bearing reservoir stratum
  • Method for cracking strata with organic materials to improve recovery ratio of adjacent oil-bearing reservoir stratum

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1: Geology and Reservoir Model I - Oil-bearing reservoirs directly adjacent to shale (eg figure 1 shown)

[0024] 1) Arrange horizontal well groups in shale formations: including multiple horizontal wells for placing heating cables, one horizontal oil production well (1), and one horizontal oil production well (2) on the top layer of the oil-bearing reservoir, heating the shale formation and closing the horizontal production wells at the same time Oil well (1), when the shale temperature rises above 150°C, the kerogen in the shale begins to crack and produce CO 2 + C2-C5 light hydrocarbon gas.

[0025] 2) Increased pressure in shale formations and oil-bearing reservoirs. CO 2 + C2-C5 light hydrocarbon gases flow into oil-bearing reservoirs. When the pressure of the oil-bearing reservoir reaches the point where crude oil and CO can be formed 2 + When the C2-C5 light hydrocarbon gas miscible pressure range, start the horizontal oil production well (2). CO...

Embodiment 2

[0029] Example 2: Geology and Reservoir Model II - Oil-bearing reservoir interbedded with shale (eg figure 2 shown)

[0030] 1) Arranging horizontal well groups in shale formations: including multiple horizontal wells for placing heating cables, and one horizontal oil production well (1). A vertical oil production well (2) is arranged on the top layer of the oil-bearing reservoir. Heating the shale formation simultaneously shuts down the horizontal producing well (1). When the shale temperature rises above 150°C, the kerogen in the shale begins to crack and produce CO 2 + C2-C5 light hydrocarbon gas.

[0031] 2) Increased pressure in shale formations and oil-bearing reservoirs. CO 2 + C2-C5 light hydrocarbon gas flows into the oil-bearing reservoir along the pre-arranged vertical well channel (3). When the pressure of the oil-bearing reservoir reaches the point where crude oil and CO can be formed 2 + When the C2-C5 light hydrocarbon gas miscible pressure range, star...

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Abstract

The invention relates to a method for cracking a strata with organic materials to improve the recovery ratio of an adjacent oil-bearing reservoir stratum. The method comprises the following steps that(1), heat is injected to an organic shale, and the shale is heated to above 150 DEG C; (2), CO2, and C2 to C5 light hydrocarbon gases produced by initial cracking of organic materials are conveyed toadjacent oil-bearing reservoir stratum, the pressure of the oil-bearing reservoir stratum increases, contained oil is completely soluble with the CO2 and the light hydrocarbon, and therefore gas flooding and CO2 / light hydrocarbon miscible enhanced oil recovery is formed; (3), crude oil in the oil-bearing reservoir stratum is produced from an oil production well installed in the reservoir stratum;(4), the heat is continuously injected to the shale, the temperature rises to above 320 DEG C, volume gas and light oil are generated and are produced through the oil production well mounted in the shale; and (5), during the termination of shale oil production, the oil production well with the oil-bearing reservoir stratum is started again, gas flooding of oil-bearing reservoir stratum is carriedout by natural gas continuously produced the shale at high temperature, and therefore the recovery ratio of the oil-bearing reservoir stratum is maximized. The high recovery ratio is obtained, and fracture to the oil-bearing reservoir stratum is not required. The economic benefits are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas development, and in particular relates to a method for cracking a formation containing organic matter to improve the recovery rate of adjacent oil-bearing reservoirs. Background technique [0002] Organic-bearing shale formations exist in many petroleum-bearing basins. Reservoirs of post-hydrocarbons exist above or below this shale formation. If the permeability of these reservoirs is low and the gas content in the stored oil is low, it is impossible to achieve high recovery and economical efficiency by relying on the volume fracturing technology currently used in industry. Existing enhanced oil recovery techniques include the use of light hydrocarbons such as propane or carbon dioxide (CO 2 ), but at a higher cost. Requires specialized light hydrocarbons or CO 2 supply sources and pipelines. Please refer to the patent application CN107002486A of Weijian Mo et al. for the description of e...

Claims

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Application Information

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IPC IPC(8): E21B43/241
CPCE21B43/241
Inventor 莫伟坚罗莉莲
Owner 安蔓页岩技术有限公司