Method for steam huff and puff heavy oil reservoir development shifted after fracturing sand control

A fracturing technology for sand control and heavy oil reservoirs, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc. It can solve the problem that the reservoir permeability is not high and cannot effectively improve the marginal oil with medium and low permeability and strong water sensitivity Problems such as poor development effect and poor development effect of heavy oil reservoirs, to achieve the effect of enhanced oil recovery and economical and effective oil recovery

Inactive Publication Date: 2015-09-30
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0004] Conventional sand control methods were used in the early stage of this type of reservoir, and various development methods such as conventional cold recovery, water injection development, steam huff and puff, and steam flooding were adopted successively. Due to the low permeability of the reservoir, the average clay content reached 14%-24%. During the development, the clay swelled and the particles migrated at the same time. More than 30% of the oil wells produced oil samples with oil sludge. The near wellbore area was seriously blocked and the oil well fluid supply was insufficient, resulting in extremely poor development results. The recovery degree of more than 20 years of development was still less than 5.0 %, which means that more than 95% of the crude oil is currently stagnant in the ground, and it is urgent to change the development method to improve the recovery rate of this type of oil reservoir
[0005] At present, relatively mature technologies for developing heavy oil such as steam huff and puff and steam flooding cannot effectively improve the development effect of heavy oil in medium-low permeability and strong water-sensitive marginal reservoirs

Method used

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Embodiment 1

[0024] The present invention can provide an economical and effective new method of enhancing oil recovery for the development of medium-low permeability sensitive heavy oil marginal reservoirs, and is applicable to the upper and lower layers of the reservoir and adjacent layers without water layer and oil-water layer, and the thickness of the formation is 20m ~40m, the superimposed effective thickness of the reservoir is greater than 6.0m, and the permeability of the reservoir is 10~500×10 -3 μm 2 , and the viscosity range of degassed crude oil at the reservoir temperature ranges from 100 to 10000mPa·s in ordinary heavy oil reservoirs.

[0025] (1) For fracturing and sand control construction, 43.8m3 of pre-drilling fluid, 137.8m3 of sand-carrying fluid, displacement of 1180-2680L / min, 48.33m3 of 0.4-0.8mm quartz sand, sand ratio of 10.0-100.17%, average sand than 35.1%. Since heavy oil reservoirs generally have shallow burial depth and loose reservoirs, fractures are easy t...

Embodiment 2

[0031] The present invention can provide an economical and effective new method of enhancing oil recovery for the development of medium-low permeability sensitive heavy oil marginal reservoirs, and is applicable to the upper and lower layers of the reservoir and adjacent layers without water layer and oil-water layer, and the thickness of the formation is 20m ~40m, the superimposed effective thickness of the reservoir is greater than 6.0m, and the permeability of the reservoir is 10~500×10 -3 μm 2 , and the viscosity range of degassed crude oil at the reservoir temperature ranges from 100 to 10000mPa·s in ordinary heavy oil reservoirs.

[0032] (1) 26.4m3 of pre-fluid for fracturing and sand control, 122.4m3 of sand-carrying fluid, displacement of 3000L / min, 44.41m3 of 0.4-0.8mm quartz sand, sand ratio of 10.05-100.24%, average sand ratio of 44.4% . Since heavy oil reservoirs generally have shallow burial depth and loose reservoirs, fractures are easy to close after fracturi...

Embodiment 3

[0038] The present invention can provide an economical and effective new method of enhancing oil recovery for the development of medium-low permeability sensitive heavy oil marginal reservoirs, and is applicable to the upper and lower layers of the reservoir and adjacent layers without water layer and oil-water layer, and the thickness of the formation is 20m ~40m, the superimposed effective thickness of the reservoir is greater than 6.0m, and the permeability of the reservoir is 10~500×10 -3 μm 2 , and the viscosity range of degassed crude oil at the reservoir temperature ranges from 100 to 10000mPa·s in ordinary heavy oil reservoirs.

[0039] (1) 23.86m3 pre-fluid for fracturing and sand control, 127.94m3 sand carrying fluid, displacement 2.55m 3 / min, add 40.69m3 of quartz sand, the sand ratio is 8.13-71.16%, and the average sand ratio is 31.8%. Since heavy oil reservoirs generally have shallow burial depth and loose reservoirs, fractures are easy to close after fracturin...

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Abstract

The invention discloses a method for steam huff and puff heavy oil reservoir development shifted after fracturing sand control. The method comprises the following steps of fracturing sand control in an oil well in heavy oil reservoir; injection of high-temperature steam into the oil well; well soaking; well opening for production. According to the method for the steam huff and puff heavy oil reservoir development shifted after the fracturing sand control, the fracturing sand control technology is used, the reduction of the reservoir stratum permeability of immediate vicinity of wellbore due to clay expansion and the blocking caused by particle migration are removed, after the physical property of the immediate vicinity of wellbore is improved, then the steam huff and puff technology is adopted for mining heavy oil, and the medium-low permeability strong water-sensitive boundary heavy oil reservoir recovery efficiency is improved.

Description

technical field [0001] The invention relates to oil recovery technology in oilfields, in particular to a method for developing heavy oil reservoirs by turning to steam huff and puff after fracturing for sand control. Background technique [0002] With the deepening of oil exploration and development, it is more difficult to find high-quality reserves, oil resources are dwindling, and oil prices continue to rise. How to improve the development effect of medium-low permeability and strong water-sensitive marginal heavy oil reservoirs and increase their recovery factors has become an important issue. It is imperative. [0003] Shengli Oilfield is rich in highly sensitive heavy oil reservoir resources, with total reserves exceeding 6000×10 4 t. Reservoirs have the characteristics of low permeability, strong sensitivity, thin reservoirs, and thick crude oil. Medium-low permeability, strong sensitivity, and severe blockage are the keys to restricting the economical and effective ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B43/24
Inventor 杨勇吴光焕陈桂华赵红雨路言秋李伟忠战艾婷李迎春吴兆徽梁金萍赵梅邓宏伟石军平王一平王传飞隋永婷李洪毅于建梅尹小梅
Owner CHINA PETROLEUM & CHEM CORP
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