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Staged fracturing construction yield increment method for waterpower in deep thickened oil deposit thick-bedded sandstone storage layer

A heavy oil reservoir and staged fracturing technology, which is applied in the directions of earth-moving drilling, fluid production, wellbore/well components, etc. , the problems such as lamination fracturing can not be realized, to achieve the effect of increasing the filling gap width and longitudinal filling degree, fast operation and large stress difference

Inactive Publication Date: 2014-06-25
崔彦立 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to solve the thick oil reservoir layer, serious heterogeneity, combined layer fracturing can not realize the uniform reformation of the whole layer, the poor fluidity of the heavy oil in the formation, and the diversion of the support fracture. The capacity requirement is much higher than that of thin oil reservoirs, etc., providing a method of hydraulic fracturing in thick sandstone reservoirs in deep heavy oil reservoirs to increase production, to achieve segmental and uniform stimulation of thick oil layers, and to improve fracturing effects. Increase the range of single well fracturing stimulation and prolong the validity period of fracturing measures

Method used

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  • Staged fracturing construction yield increment method for waterpower in deep thickened oil deposit thick-bedded sandstone storage layer
  • Staged fracturing construction yield increment method for waterpower in deep thickened oil deposit thick-bedded sandstone storage layer
  • Staged fracturing construction yield increment method for waterpower in deep thickened oil deposit thick-bedded sandstone storage layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Fracturing construction mode of perforated and unfractured layers in old wells

[0049] The production stimulation method of the present invention is applied to Yudong 204-114 well, and the production well section is 2926-2955.0 meters.

[0050] The construction steps are as follows:

[0051] 1. Identify oil-free calcareous interlayers, muddy interlayers, and physical interlayers in the production well section of 2926-2955.0 meters, and select interlayers.

[0052] According to the readings of well logging curves, compared with different interlayer electrical logging identification standards and rock mechanics parameter tables (or according to the readings on the electrical logging identification chart), the perforated section of 2926-2955.0 meters in the oil layer (2926.0-2933.47m, 2934.07-3944.62m, 2945.22-2955.0m), preferably 2944.62-2945.22m calcareous interlayer is staged fracturing barrier.

[0053] (1) The electrical measurement identification standa...

Embodiment 2

[0082] Example 2: Construction mode of perforated and fractured layers in old wells

[0083] The production stimulation method of the present invention is applied to well Yudong 204-5, and the production interval is 2818.4-2886.4 meters.

[0084] The construction steps are as follows:

[0085] 1. Using the interlayer identification method described in Example 1, the 2834.6-2837.5 m mud interlayer and the 2843.9-2846.4 m calcareous interlayer are preferably used as staged fracturing interlayers in the production perforated section; In the main water-producing well section, water blocking proppant was used to seal the old fractures for water blocking; the 2837.5-2843.9m well section adopted the technology of balancing the middle layer to protect the middle layer, and no fracturing was carried out; the 2818.4-2834.6m well section implemented stimulation fracturing.

[0086] 2. Install cable blowout preventer, cable transmission large-aperture coverage perforation, 2821.00-2822.7...

Embodiment 3

[0102] Example 3: Non-water-controlled fracturing construction mode for new wells and new perforated layers

[0103] The production stimulation method of the present invention is applied to Yudong 17-17 well, and the new well is put into production in the 3276.5m-3299.7m and 3302m-3307.6m well sections of the T2K2 oil layer group.

[0104] The construction steps are as follows:

[0105] 1. Using the interlayer identification and evaluation method described in Example 1, the 3302.1-3299.7 m calcareous interlayer and the 3295-3292 m lithological interlayer are preferably used as fracturing interlayers in the production well section.

[0106] 2. Install cable BOP, magnetic positioning depth correction, cable transmission large-aperture perforation, gun type Huabei 102-16, Daqing 54 bullet type, hole density 16 holes / m, hole diameter 33.5mm, penetration depth 255mm, total hole 343 holes were counted, 343 holes were actually shot, and the perforation rate was 100%.

[0107] 3. L...

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Abstract

The invention relates to a staged fracturing construction yield increment method for waterpower in a deep thickened oil deposit thick-bedded sandstone storage layer. The method comprises the following steps: identifying oil-free calcium interlayer, a soil interlayer and a physical property interlayer in a thickened oil thick storage layer; selecting the oil-free calcium interlayer, the sol interlayer and the physical property interlayer in different layer sections in a well as a staged fracturing interlayer so as to form a plurality of fracturing layer sections; keeping away from the staged fracturing interlayer; carrying out large-aperture perforation to a plurality of staged fracturing layer sections by cable transmission cooperated with perforation bullets; pre-treating the staged fracturing layer sections by bio-enzyme depolymerization liquid; and carrying out staged fracturing construction to staged fracturing pipe columns inside layers in a well. According to the invention, staged uniform transform of a thickened oil layer is realized; fracturing effect is improved; single-well fracturing yield increment amplitude is increased; and a fracturing measure validity period is prolonged.

Description

technical field [0001] The invention relates to a hydraulic fracturing stimulation method for reservoirs in oilfield development, in particular to a method for increasing production by hydraulic fracturing in thick sandstone reservoir layers of deep heavy oil reservoirs, especially suitable for ultra-deep heavy oil weakly cemented sandstone New well development or old well reconstruction in bottom water reservoirs. Background technique [0002] my country is extremely rich in heavy oil resources. At present, more than 70 heavy oil reservoirs have been discovered in 15 large oil-bearing basins including Songliao, Bohai Bay, Junggar, Tuha, Tarim, and Erlian. 2 billion tons, of which ultra-deep > 1700m accounted for 6%. However, among the ultra-deep heavy oil reservoirs, only the Tahe carbonate heavy oil field in the Tarim Basin and a certain sandstone heavy oil field in the Turpan-Hami Basin have been put into development. , it is extremely difficult to develop. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/20
Inventor 崔彦立王玉成钱继贺吕芬敏姜延庆王宗益许云春
Owner 崔彦立
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