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Method for improving oil reservoir recovery efficiency of interlayer developed deep-layer heavy oil

A technology for heavy oil reservoirs and interlayers, which is applied to improve the recovery rate of deep heavy oil reservoirs with interlayers and super heavy oil reservoirs. It can solve the problem of uneven vapor absorption in vertical oil layers, reduce vertical displacement volume, and produce To achieve the effect of increasing the production-injection ratio, reducing the risk of premature gas channeling, and uniform displacement

Active Publication Date: 2014-04-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] (2) In massive oil reservoirs, the continuous thickness of the oil layers in the vertical direction is large, and the vertical oil layers absorb steam unevenly, and the production degree varies greatly
[0014] (3) Some oil reservoirs with deep burial and high crude oil viscosity cannot meet the screening criteria of steam flooding and SAGD; block In the late stage of steam stimulation, the production declines rapidly, and it is urgent to find an economical and effective replacement method;
[0015] (4) In thick heavy oil reservoirs with interlayers, the interlayers cause seepage differences, reduce the vertical displacement volume, and affect the development effect
However, the transformation of the development mode of heavy oil reservoirs with a burial depth greater than 1000m is still a forbidden area for heavy oil development

Method used

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  • Method for improving oil reservoir recovery efficiency of interlayer developed deep-layer heavy oil
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  • Method for improving oil reservoir recovery efficiency of interlayer developed deep-layer heavy oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] The buried depth of the QD block oil reservoir is ‐1380~-1510m, the average oil layer effective thickness is 35m, the internal interlayer is well developed, the average porosity is 24.5%, the average permeability is 1463md, the crude oil viscosity at 50℃ is 194037mPa·s, and the average residual contain The oil saturation is 48%, which is a thick massive super heavy oil reservoir.

[0121] Rough screening is carried out according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: the buried depth of the reservoir is 1000-2000m, the thickness of the oil layer is 30-150m, the remaining oil saturation is >40%, the porosity is >18%, the permeability is >200md, and the viscosity of degassed crude oil under formation conditions is >50000mPa· s.

[0122] According to the reservoir engineering design, there are 10 vertical wells and 2 horizontal wells in the well group, including 3 steam injection wells with ...

Embodiment 2

[0124] The buried depth of Block M oil reservoir is ‐1430~-1650m, the average oil layer effective thickness is 47m, the internal interlayer is well developed, the average porosity is 18.7%, the average permeability is 1392md, the crude oil viscosity at 50℃ is 82300mPa·s, and the average residual contain The oil saturation is 52%.

[0125] According to the geological characteristics and development status of the oilfield, the reservoir meets the following conditions: the buried depth of the reservoir is 1000-2000m, the thickness of the oil layer is 30-150m, the remaining oil saturation is >40%, the porosity is >18%, the permeability is >200md, and the formation conditions The viscosity of degassed crude oil is >50000mPa·s.

[0126] On the basis of the analysis of the development effect and the study of the distribution of remaining oil, the reservoir engineering design of the block is designed, and vertical wells are designed for steam injection, and vertical wells and horizon...

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Abstract

The invention provides a method for improving the oil reservoir recovery efficiency of interlayer developed deep-layer heavy oil, which relates to linked oil extraction of vertical wells and horizontal wells. The core and the aim of the invention lie in that: for a deep-layer interlayer developed thick-layer super-heavy oil reservoir, on the basis of interlayer detailed description and remaining oil distribution rule research, the horizontal wells are disposed between the vertical wells of which the selection continuous thicknesses are high and the primary square well nets are 70 to 210m in diameter by using the steam oil displacement mechanism. Some vertical wells in a well group are selected to be subjected to steam injection, and the other vertical wells and horizontal wells are subjected to linked oil extraction. By the technology, the conflict that an oil layer is not uniformly used because of the steam overlapping effect can be effectively solved, the adverse influence of an interlayer on the switch of development ways is reduced, the production and injection ratio of deep-layer oil reservoir steam driving high-speed steam injection and the shaft bottom steam dryness are effectively improved, the pressure of the oil layer is reduced, the swept volume is enlarged, and thus the recovery efficiency during the later period of steam huff and puff is greatly improved.

Description

technical field [0001] The invention belongs to the field of oil reservoir development, and relates to the enhanced oil recovery technology of deep ultra-heavy oil reservoirs, in particular to a technology for improving the oil recovery of deep heavy oil reservoirs developed in interlayers. Super-heavy oil reservoirs with high and interlayer development. Background technique [0002] Crude oil viscosity is the main parameter to measure the flow ability of crude oil. In the development process of heavy oil in my country, heavy oil (also called heavy oil, Heavy Oil) is divided into three categories, namely ordinary heavy oil, extra heavy oil and super heavy oil. Among them, the viscosity of ordinary heavy oil is the lowest among the three types of crude oil, and the viscosity of crude oil is 50-10000mPa·s; the viscosity of extra-heavy crude oil is 10000-50000mPa·s; The higher the viscosity of crude oil, the more difficult it is to develop the reservoir. [0003] Due to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/30
Inventor 张方礼孙洪军王平宫宇宁李培武李迎环李艳
Owner PETROCHINA CO LTD