Method and well pattern structure for exploiting heavy oil reservoir through gravity assisted nano magnetofluid flooding

A nano-magnetic fluid and heavy oil reservoir technology, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc., can solve the problems of low production degree of horizontal section, potential safety hazards, small application range, etc., and achieve acceleration plane The effects of vertical flow, increased oil production rate, and reduced displacement resistance

Active Publication Date: 2013-10-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is only suitable for the exploitation of heavy oil reservoirs with a single-layer thickness greater than 15m. Since the fluidity of steam is much higher than that of crude oil, steam is easy to escape into the lower production well in the high-permeability area, resulting in low production degree of the horizontal section. Effective technology flexibly controls the drawing section of the horizontal section so that it can be evenly drawn
[0006] Incineratio

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  • Method and well pattern structure for exploiting heavy oil reservoir through gravity assisted nano magnetofluid flooding
  • Method and well pattern structure for exploiting heavy oil reservoir through gravity assisted nano magnetofluid flooding

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Embodiment 1

[0050] This embodiment provides a method for gravity-assisted nanomagnetic fluid flooding to exploit heavy oil reservoirs. Under oil layer conditions, the viscosity of the degassed crude oil of the heavy oil reservoir is 5000 centipoise, and the effective thickness of the target oil layer 9 is 25 m. Oil layer refers to a certain independent oil layer developed in this embodiment or several independent oil layers generally developed when the exploitation area of ​​the oil field contains one or several independent oil layers; now gravity-assisted nano-magnetic fluid flooding is used to exploit heavy oil reservoirs The method of mining the oil reservoir.

[0051] step one:

[0052] A well pattern 100 is arranged in the oil reservoir area; the well pattern 100 includes a plurality of top horizontal wells 1 arranged on the top of the oil layer in the same target oil layer 9 in the production area and a plurality of bottom horizontal wells 2 arranged on the bottom of the oil layer; The ...

Embodiment 2

[0066] The principle of this embodiment is basically the same as that of embodiment 1. The difference is that the viscosity of the degassed crude oil of the selected reservoir heavy oil under oil layer conditions is 12000 centipoise, and the effective thickness of the target oil layer 9 is 22m; gravity-assisted nanomagnetic fluid is now used The method of flooding and recovering heavy oil reservoirs exploits the reservoir.

[0067] step one:

[0068] A well pattern 100 is arranged in the oil reservoir area; the well pattern 100 includes a plurality of top horizontal wells 1 arranged on the top of the oil layer in the same target oil layer 9 in the production area and a plurality of bottom horizontal wells 2 arranged on the bottom of the oil layer; The horizontal sections of the plurality of top horizontal wells 1 are arranged in parallel and evenly spaced; the horizontal sections of the plurality of bottom horizontal wells 2 are also arranged in parallel and evenly spaced; the hori...

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Abstract

The invention relates to a method and a well pattern structure for exploiting a heavy oil reservoir through gravity assisted nano magnetofluid flooding. The method comprises the steps that a plurality of top horizontal wells and bottom horizontal wells are uniformly arranged at the top and the bottom of an oil layer to form a horizontal well space orthogonal well group, a slotted screen and blind pipe sectorial connecting manner is adopted at horizontal sections of the top horizontal wells and the bottom horizontal wells for well completion, high-energy electromagnets are placed in positions, corresponding to slotted screens, in shafts at the horizontal sections of the bottom horizontal wells respectively, surfactant wrapped hydrocarbon-based nano magnetofluid dispersion solutions are injected into the top horizontal wells at a certain speed, the electromagnets in the bottom horizontal wells are started, nano magnetofluid injected into the oil layer is magnetized, is diffused and moves from the top of the oil layer to positions nearby shafts at screen segments of the bottom horizontal wells of the oil layer by the action of attraction and self gravity, and displaces crude oil in the oil layer, and the crude oil is exploited to the ground by intermittent magnetism stop production of the bottom horizontal wells. The method can increase and improve the oil recovery rate and recovery efficiency of the heavy oil reservoir.

Description

Technical field [0001] The invention relates to a method for exploitation of heavy oil reservoirs in the field of petroleum exploitation, in particular to a method for gravity-assisted nano magnetic fluid flooding and exploitation of heavy oil reservoirs and a well pattern structure. Background technique [0002] At present, the main technologies for the development of heavy oil reservoirs at home and abroad are thermal development technologies such as steam huff and puff, steam flooding, oil burning, and steam assisted gravity drainage (SAGD). [0003] Steam huff and puff technology has the advantages of low cycle injection and fast investment payback period. However, it is affected by the viscosity resistance of heavy oil. The radius of the oil layer used by steam is small and the recovery rate is only about 8% to 15%. It is necessary to change the mining method after the huff and puff. . [0004] Steam flooding is mainly used as a main replacement technology after steam huff and ...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/30
Inventor 吴永彬王红庄赵欣蒋有伟李秀峦
Owner PETROCHINA CO LTD
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