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Fireflooding huff and puff and fireflooding linkage thickened oil exploitation method

A fire flooding and linkage technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of inability to use extra-heavy oil and super-heavy oil, and achieve the effect of reducing seepage resistance

Inactive Publication Date: 2014-12-10
BEIJING PUXIN PETROLEUM TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Under the current technical conditions, fire flooding or fire flooding huff and puff technology cannot be used in extra-heavy oil and super-heavy oil reservoirs

Method used

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  • Fireflooding huff and puff and fireflooding linkage thickened oil exploitation method
  • Fireflooding huff and puff and fireflooding linkage thickened oil exploitation method

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Experimental program
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Effect test

Embodiment 1

[0040] Reservoir 1 The depth of the reservoir is 840m; the thickness of the oil layer is 13.6m; the permeability of the oil layer is 940×10 -3 μm 2 ; Reservoir temperature 48°C; Crude oil viscosity 35000mPa.s, belonging to extra heavy oil reservoir; Crude oil density 0.9840g / cm 3 ; Oil saturation is 68.9%; Conventional cold recovery has no output, steam huff and puff test production effect is poor, and the oil-steam ratio is lower than 0.2, which cannot be economically developed.

[0041] Using the fire drive throughput and fire drive linkage development test of the present invention, the scheme is deployed as follows:

[0042] 1) Design 4 well groups (4 injection and 9 production) according to the square area well pattern with 100m well spacing, 13 new wells are drilled, all 13 wells adopt fire flooding huff and puff in the initial stage, and fire flooding in 4 well groups in the later stage mining. The area of ​​the test area is 0.08km 2 , The drawing reserve is 196,000 ...

Embodiment 2

[0050] Reservoir 2 The depth of the reservoir is 640m; the thickness of the reservoir is 14m; the permeability of the reservoir is 940×10 -3 μm 2 ; Reservoir temperature 37℃; crude oil viscosity 55000mPa.s, belonging to super heavy oil reservoir; crude oil density 0.9870g / cm 3 ; The oil saturation is 72.9%; the conventional cold recovery has no output, the effect of the steam huff and puff trial production is poor, and the oil-steam ratio is lower than 0.15, so it cannot be economically developed. Therefore, it was decided to adopt fire drive throughput and fire drive linkage development test, and the scheme deployment is as follows:

[0051] 1) Deploy 4 regular hexagonal reverse 7-point well patterns in the test area, drill 20 new vertical wells including 4 gas injection wells and 16 production wells; the distance between injection and production wells is 100m, and the distance between adjacent production wells is 100m; The internal controlled oil-bearing area is 0.104 squa...

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Abstract

The invention provides a fireflooding huff and puff and fireflooding linkage thickened oil exploitation method. The method comprises the steps of conducting well spacing in an area well pattern mode, wherein the distance between a deployment central well and the nearest producing well around the central well is smaller than or equal to 100 m; conducting fireflooding huff and puff on all wells of a deployment well pattern synchronously or sequentially; conducting area fireflooding with the central well of the area well pattern serving as a continuous gas-injection well and surrounding wells serving as producing wells after fireflooding huff and puff is conducted on all the wells for three to five periods averagely. According to the method, by means of fireflooding huff and puff and fireflooding linkage, air injection fireflooding exploitation of extra-heavy oil reservoirs and super-heavy oil reservoirs with viscosity over 10000 mPa.s under the formation condition is made possible.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and in particular relates to a method for jointly exploiting heavy oil by using fire flooding huff and puff and fire flooding mining technologies. Background technique [0002] At present, China's heavy oil development methods mainly include steam stimulation (about 78%), steam flooding (about 10%) and conventional water flooding (about 10%). With the extension of steam injection time, the economic benefit becomes worse, and it is urgent to change the development method. For extra heavy oil (degassed crude oil viscosity exceeds 10000mPa.s at formation temperature) and super heavy oil (degassed crude oil viscosity exceeds 50000mPa.s at formation temperature) reservoirs, currently only those reservoirs with good physical properties and oil layer thickness Only large reservoirs can be developed through steam stimulation and SAGD technology, and the cost is very high. [0003] In recent years,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/243
Inventor 雷春娣
Owner BEIJING PUXIN PETROLEUM TECH DEV
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