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Fracture-assisted combustion of oil in-situ stimulation thickened oil exploiting method

A technology of burning oil layers and heavy oil, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of difficult air injection and heavy oil reservoir development, and achieves increased heating range and cycle cumulative production The effect of increasing and increasing the area

Inactive Publication Date: 2015-01-07
BEIJING PUXIN PETROLEUM TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention mainly aims at the problem of difficulty in mining low-permeability heavy oil reservoirs, thin-layer heavy oil reservoirs, and thin-interlayer heavy oil reservoirs, and provides an improved method for recovering heavy oil by burning oil layer huffing and puffing to solve the problem of injection Difficult air technical issues, expanding the range of the combustion zone, increasing oil production

Method used

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  • Fracture-assisted combustion of oil in-situ stimulation thickened oil exploiting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Reservoir 1 The depth of the reservoir is 800m; the thickness of the oil layer is 19.6m; the permeability of the oil layer is 610×10 -3 μm 2 ; Reservoir temperature 32°C; Crude oil viscosity 5100mPa.s; Crude oil density 0.9240g / cm 3 ; Oil saturation 58.9%; J 1 、J 2 The wells are two production wells in the reservoir, and the conventional cold recovery production is lower than the economic limit production. Formation fracture pressure is 18MPa.

[0035] (1) to J 1 Perforate the casing in the oil section of the well, and use hydraulic fracturing technology to press out 40m long artificial fractures, and fill the fractures with fracturing proppant. The main construction parameters include: accumulatively adding 40m of ceramsite with a particle size of 0.425mm to 0.850mm 3 ; Prefluid 40m 3 ; Carrying fluid 105m 3 ; Displacement 3.5m 3 / min; the sand ratio increases step by step, from 10% to 80%, and after reaching the highest sand ratio, add 5m of displacement flui...

Embodiment 2

[0041] Reservoir 2 The depth of the reservoir is 1200m; the thickness of the oil layer is divided into 3 small thin layers, with a total thickness of 11.2m; the permeability of the oil layer is 410×10 -3 μm 2 ; Reservoir temperature 30°C; Crude oil viscosity 4800mPa.s; Crude oil density 0.9220g / cm 3 ; Oil saturation 55.9%. J 11 and J 12 The wells are two production wells in the reservoir, and conventional cold production has no production capacity.

[0042] (1) to J 12 The casing of the oil zone of the well is perforated.

[0043] (2)J 12 The well adopts hydraulic fracturing technology to press out 35m long artificial fractures, and adds 30m of proppant 3 , 3 thin oil layers to achieve up and down penetration. The specific construction parameters include accumulatively adding 30m of ceramsite with a particle size of 0.425mm to 0.850mm 3 ; Prefluid 35m 3 ; Carrying fluid 85m 3 ; Displacement 3.2m 3 / min; the sand ratio increases step by step, from 10% to 80%, and af...

Embodiment 3

[0051] Reservoir 3 The depth of the reservoir is 2600m; the thickness of the oil layer is divided into 2 small layers, with a total thickness of 14.2m; the permeability of the oil layer is 550×10 -3 μm 2 ; Reservoir temperature 75°C; Degassed crude oil viscosity at formation temperature 22800mPa.s; Crude oil density 0.9820g / cm 3 ; Oil saturation 67.9%. L 1 and L 2 The wells are two production wells in the reservoir, and conventional cold production has no production capacity. In the early stage, supercritical pressure steam injection test production was carried out, and the average daily production was lower than 3t, which had no economic benefits. The formation fracture pressure is 46MPa, and the maximum gas injection pressure of the surface compressor is 35MPa.

[0052] (1) to L 1 The perforation section of the well casing adopts hydraulic fracturing technology to press out 40m long artificial fractures, and adds 35m of proppant 3 , The two oil layers are connected up...

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Abstract

The invention relates to a fracture-assisted combustion of oil in-situ stimulation thickened oil exploiting method. The method comprises the steps of conducting hydrofracture transformation on the oil reservoir on the perforating section of an oil well casing, forming vertical artificial fractures on both wings of a shaft, adding fracturing propping agents with which the fractures are filled, and conducting sieve tube gravel pack completion inside the casing; making the bottom hole temperature reach the ignition temperature of crude oil by means of the firing technique to ignite the oil layer of an oil well; injecting air into the oil well continuously by means of an air compressor; conducting soaking after air injection; opening the well for stoping. The method is mainly applied to low-permeation heavy oil reservoirs, thin-bedded heavy oil reservoirs and thin-interbed heavy oil reservoirs. Compared with the prior art, the method has the advantages that combustion of oil in-situ stimulation air injection speed and monocyclic cumulative injection rate can be increased by over three times, thermal front and flue gas front swept volume is increased by over three times, well yield is increased by over two times, and cyclic cumulative production is increased by over three times.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and in particular relates to a method for fracturing and assisting inflaming oil layer huff and puff to exploit heavy oil. 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%). These methods are simple in process and high in recovery, and are suitable for heavy oil reservoirs with shallow burial depth (less than 1000m). However, for oil reservoirs with a burial depth greater than 1500m, it is difficult to exploit this type of heavy oil due to the high heat loss rate and high steam injection pressure of steam injection; for some water-sensitive oil reservoirs, during steam injection, , the condensed water of the steam in the formation will cause the clay to expand, resulting in a decrease in the effective permeability, and the phenomenon of no inject...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/247E21B43/267
CPCE21B43/247E21B43/267
Inventor 雷春娣
Owner BEIJING PUXIN PETROLEUM TECH DEV
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