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Fracturing transformation method for blocking lake basin shale oil reservoir layer

A shale oil and reservoir technology, applied in the field of oil and gas reservoir exploration, can solve the problems of poor adaptability of fracturing technology, difficulty in effectively producing shale oil reservoirs in closed lake basins, and large differences in fracturing effects.

Active Publication Date: 2018-10-19
DAGANG OIL FIELD GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the fracturing operations for shale oil reservoirs in closed lake basins usually follow the same type of pumping procedures, resulting in large differences in fracturing effects and poor adaptability of fracturing techniques, making it difficult to effectively develop shale oil reservoirs in closed lake basins

Method used

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  • Fracturing transformation method for blocking lake basin shale oil reservoir layer
  • Fracturing transformation method for blocking lake basin shale oil reservoir layer
  • Fracturing transformation method for blocking lake basin shale oil reservoir layer

Examples

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Effect test

Embodiment 1

[0053] Well KN is an exploratory well in Cangdong Sag, Huanghua, Bohai Bay Basin. Well logging has explained the reservoir lithology profile of Well KN, and the fracturing design is carried out according to the reconstruction method of the present invention.

[0054] S1: According to the interpretation of well logging data, the cloud-to-ground ratio (the cloud-to-ground ratio refers to the ratio of the cumulative thickness of dolomite to the thickness of the formation) is 59%, the rock type is argillaceous dolomite facies, and the thickness of a single layer from well logging interpretation is 0.2-0.85m Between them, the single-layer interpretation thickness of well logging is less than 1m, and the source-reservoir configuration relationship is a layer cake.

[0055] S2: According to the principle of optimal fracturing process for reservoirs with different source-reservoir configuration relationships, the preferred fracturing process is slick water + cross-linked gel one-time s...

Embodiment 2

[0060] Well G08 is an exploratory well in Cangdong Sag, Huanghua, Bohai Bay Basin. Well logging has interpreted the reservoir lithology profile of Well G08, and the fracturing design is carried out according to the reconstruction method of the present invention.

[0061] S1: According to the interpretation of well logging data, the cloud-to-ground ratio (cloud-to-ground ratio refers to the ratio of the cumulative thickness of dolomites to the thickness of the formation) is 13%, and the rock type is mudstone facies. The single-layer interpretation and evaluation thickness of the well is 1.3m, and the source-reservoir configuration relationship is interbedded.

[0062] S2: According to the principle of optimal fracturing process for reservoirs with different source-reservoir configuration relationships, the preferred fracturing process is slick water + cross-linked gel secondary sand fracturing process, and the single-stage fluid volume is optimized to 1500m 3 , wherein the volu...

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Abstract

The invention provides a fracturing transformation method for a blocking lake basin shale oil reservoir layer. The method comprises the following steps of S1, obtaining key data according to existingwell logging data explanations, and determining the source reservoir configuration relations according to the longitudinal overlapping relation of different kinds of rock in well logging lithologic sections; S2, according to existing rock mechanics tests, ground stress tests and natural fracture distribution data, formulating a fracturing technology optimum selecting principle for reservoirs withdifferent source reservoir configuration relations; S3, dividing preponderant lithofacies according to the lithologic sections and the cloud-ground ratio, and formulating an optimum selecting principle for the classification of the preponderant lithofacies, a fracturing liquid anti-expanding system and proppants through the combination of existing core anti-swelling experiments and rock board embedding experiment data. By means of the fracturing transformation method for the blocking lake basin shale oil reservoir layer, according to the differences in the rock types and the stratum source reservoir configuration relations, the individualized fracturing liquid system can be optimally selected, the fracturing pump casting procedures can be optimized, and the fracturing transformation effectis improved.

Description

technical field [0001] The invention belongs to the field of oil and gas reservoir exploration, and in particular relates to a fracturing reconstruction method for shale oil reservoirs in closed lake basins. Background technique [0002] With the deepening of exploration and development of oil and gas reservoirs, unconventional oil and gas, especially shale oil, has become a replacement field for exploration and development. Shale oil and gas resources are abundant and have great exploration potential. However, shale oil reservoirs in closed lacustrine basins are vertically interlaced with dolomite and mudstone, with strong homogeneity and large lithology changes. [0003] At present, fracturing operations for shale oil reservoirs in closed lake basins usually follow the same type of pumping procedures, resulting in large differences in fracturing effects and poor adaptability of fracturing techniques, making it difficult to effectively develop shale oil reservoirs in closed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267C09K8/68
CPCC09K8/685E21B43/267
Inventor 刘学伟田福春付大其陈紫薇张胜传赵玉东贾云鹏隋向云石瑾构小婷李晓娟郝桂宪王娟张润泽周震伍勇
Owner DAGANG OIL FIELD GRP
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