Oil deposit water-driving exploiting method of ultra-high water-containing period

A technology of ultra-high water cut period and water flooding, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of development and adjustment difficulties, increase recoverable reserves, slow down the decline rate of water flooding production, etc. Achieving good development effect and economic benefit, improving oil recovery and extending the validity period

Active Publication Date: 2013-04-17
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the scattered distribution of injection-production wells for adjustment and treatment, it is difficult to achieve large-scale effects; in addition, all the above-mentioned adjustments and treatment are carried out under the existing 300m injection-production well spacing, and no fundamental changes have been realized (the degree of control is still <70m %), especially the refilling measures, disrupted the original development strata, resulting in intricate injection-production relationships in underground well patterns, which brought greater difficulties to later de

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  • Oil deposit water-driving exploiting method of ultra-high water-containing period
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  • Oil deposit water-driving exploiting method of ultra-high water-containing period

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Embodiment 1

[0023] Embodiment 1: Taking La 6-PS1733 well as an example, the development method and effect of the present invention are set forth

[0024] 1. Use polymer flooding with 150m injection-production well spacing:

[0025] The original water flooding development of the oilfield adopts 300m injection-production well spacing, the average daily liquid production of a single well is 11t, the daily oil production is 0.6t, and the water cut is 94.9%. La 6-PS1733 is used as the production well, and the injection-production well spacing is 150m by polymer flooding.

[0026] 2. Determine the development object:

[0027] Well La 6-PS1733 is a polymer flooding production well in a second-type oil layer in the block, which is used as a water flooding production well, and the target interval is the Sa III4-10 oil layer.

[0028] 3. Further refine oil layer units and analyze the types and functions of structural interfaces:

[0029] Divide the SaⅢ4-10 reservoir into seven structural units...

example 2

[0034] Example 2: Taking Well La 7-PS1734 as an example, explain the development methods and effects

[0035] 1. Use polymer flooding with 150m injection-production well spacing:

[0036] The original water flooding development adopts 300m injection-production well spacing, the average daily liquid production of single well is 11t, daily oil production is 0.6t, and water cut is 94.9%. La 7-PS1734 is used as a water injection well, and the injection-production well spacing is 150m by polymer flooding.

[0037] 2. Determine the development object:

[0038] The La 7-PS1734 well group is a polymer flooding injection-production well group in the second type of oil layer in the block, which injects water into the surrounding 4 production wells, namely La 7-PS1731, La 6-PS1723, La 7-PS1801, and La 7-PS1733 Wells with an injection-production well spacing of 150m are used as water-flooding injection-production well groups, and the target interval is the SaⅢ4-10 oil layer.

[0039] 3...

Embodiment 3

[0045] Embodiment 3: take Lamadian Oilfield as block object, adopt the method of the present invention to develop, and the step of specific development method is:

[0046] 1. Determine the well pattern and use polymer flooding with a 150m injection-production well spacing:

[0047] The practice of oilfield development shows that the control degree of reasonable injection-production well spacing should be higher than 90%, so as to adapt to the geological characteristics of oil reservoirs to the greatest extent and achieve high oil recovery and economic benefits. After the original water flooding 300m injection-production well spacing in block SaⅢ4-10 oil layer was reduced to 150m, the degree of water flooding control was greatly improved, from 86.36% of the original well pattern to 97.64%, an increase of 11.28 percentage points. Among them, three directions The above control degree increased from 72.73% to 86.05%, an increase of 13.32 percentage points, which can achieve a bet...

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Abstract

The invention discloses an oil deposit water-driving exploiting method of an ultra-high water-containing period. The oil deposit water-driving exploiting method solves the problem that the existing water-driving exploiting method of the oil field of the ultra-high water-containing period is poor in effect, adopts a 'two and three combined' exploiting method and particularly comprises: fully utilizing a deployed secondary oil-layer polymer flooding infilled well pattern within about three years before tertiary oil recovery of a secondary oil layer, performing flooding infillled adjusting digging on a first set of polymer flooding layer of the secondary oil layer according to a tertiary oil recovery layer by applying fine geological research results, building a new driving system through selective perforating, organically combining flooding secondary oil recovery with tertiary oil recovery, strengthening flooding secondary oil recovery on a structural unit with remaining oil enriched in the thick oil layer, simultaneously performing proper comprehensive adjusting and then turning into the tertiary oil recovery at a proper time. According to verification, the oil deposit water-driving exploiting method of the ultra-high water-containing period achieves the aim of improving flooding exploitation effect, enhancing oil recovery and prolonging validity of flooding exploitation, and can guide the exploitation and adjustment of the ultra-high water-containing period of the oil field.

Description

technical field [0001] The invention relates to an oil reservoir development method and an adjustment technology, belonging to a multi-reservoir heterogeneous sandstone oil field development method and an adjustment technology in an extra-high water-cut period. Background technique [0002] Lamadian Oilfield is a layered sandstone oilfield controlled by structure, and is a typical sandstone oil reservoir. It has the geological characteristics of layered sedimentation and structure control of sandstone oil reservoirs, and is very typical and representative in sandstone oil reservoirs. [0003] Lamadian Oilfield is located at the northernmost tip of Daqing Changyuan, with an oil-bearing area of ​​100km 2 , geological reserves 81472×10 4 t, put into development in 1973, after seven large-scale development adjustments, entered the ultra-high water-cut development stage (water cut > 90%) in 1997. At present, the production degree of oil layers is high (water flooding ratio 9...

Claims

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Application Information

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IPC IPC(8): E21B43/20
Inventor 王朋王伟杨光徐春松龙燕
Owner PETROCHINA CO LTD
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