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Method for determining gas channeling of unit nitrogen flooding in fractured-vuggy reservoir and method for preventing channeling in injection and production

A judging method and fracture-cavity type technology, which is applied in the directions of earthwork drilling, mining fluid, measurement, etc., can solve the problems of conventional identification of gas channeling, unsuitable treatment methods, and low gas drive efficiency

Active Publication Date: 2020-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies existing in the prior art such as low gas flooding efficiency due to nitrogen flooding and gas channeling in fractured-cavity reservoirs, conventional identification of gas channeling and treatment methods are not suitable for fractured-cavity reservoirs with strong heterogeneity

Method used

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  • Method for determining gas channeling of unit nitrogen flooding in fractured-vuggy reservoir and method for preventing channeling in injection and production
  • Method for determining gas channeling of unit nitrogen flooding in fractured-vuggy reservoir and method for preventing channeling in injection and production

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Effect test

Embodiment 1

[0047] This embodiment is an injection-production anti-channeling method for weathering crust oil reservoirs:

[0048] (1) Based on the characteristics of fractured-vuggy reservoirs and unit nitrogen flooding production characteristics, a determination method for unit nitrogen flooding gas channeling in fractured-vuggy reservoirs is established:

[0049] Characteristics of weathered crust oil reservoirs: the reservoirs are distributed contiguously, and the remaining oil is controlled by the interwell structure or the height of residual mounds;

[0050] Production characteristics of nitrogen flooding, including dynamic responses during injection and production, such as changes in oil increment, water cut, gas production, oil pressure, casing pressure, and nitrogen content in natural gas.

[0051] First, based on the production characteristics of unit nitrogen flooding, the judgment principle of gas channeling in unit nitrogen flooding of fractured-vuggy reservoirs is establishe...

Embodiment 2

[0066]This embodiment is an injection-production anti-channeling method for underground river reservoirs:

[0067] (1) Based on the characteristics of fractured-vuggy reservoirs and unit nitrogen flooding production characteristics, a determination method for unit nitrogen flooding gas channeling in fractured-vuggy reservoirs is established:

[0068] Characteristics of underground river reservoirs: the reservoirs are distributed in stripes, with strong filling ability, poor connectivity, developed small pores and vugs, and the remaining oil is distributed in small pores and vugs on both sides of high conductivity channels;

[0069] Production characteristics of nitrogen flooding, including dynamic responses during injection and production, such as changes in oil increment, water cut, gas production, oil pressure, casing pressure, and nitrogen content in natural gas.

[0070] First, based on the production characteristics of unit nitrogen flooding, the judgment principle of gas...

Embodiment 3

[0088] This embodiment is an injection-production anti-channeling method for fault-controlled oil reservoirs:

[0089] (1) Based on the characteristics of fractured-vuggy reservoirs and unit nitrogen flooding production characteristics, a determination method for unit nitrogen flooding gas channeling in fractured-vuggy reservoirs is established:

[0090] Characteristics of fault-controlled reservoirs: The reservoirs develop along the faults and are multi-branched and well connected along the faults. The remaining oil is distributed in the partitioned remaining oil at the wings of the faults and is enriched in the transition zone of the faults.

[0091] Production characteristics of nitrogen flooding, including dynamic responses during injection and production, such as changes in oil increment, water cut, gas production, oil pressure, casing pressure, and nitrogen content in natural gas.

[0092] First, based on the production characteristics of unit nitrogen flooding, the judg...

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Abstract

The invention relates to a method for determining gas channeling of unit nitrogen flooding in a fractured-vuggy reservoir and a method for preventing channeling in injection and production. The methodfor determining gas channeling comprises the following steps of step 1, gas channeling determination principles: (1) the nitrogen content in produced gas of a production well is greater than 10%, andthe nitrogen content when nitrogen flooding is not implemented is not greater than 5%, which are both volume fractions; and (2) the gas production of the production well is greater than 1.5 times that when nitrogen flooding is not implemented; and step 2, determination that gas channeling occurs in the unit nitrogen flooding when the unit nitrogen flooding with high gas channeling risks at leastsatisfies any gas channeling determination principle, wherein the unit nitrogen flooding with the high gas channeling risks comprises at least one easy gas channeling factor that there are cross-wellfracture zones or secondary fractures between wells, the injection-production relationship is low injection and high production, and there is no structural high point or dip angle in a local structural form between the wells. If the gas channeling of the unit nitrogen flooding is determined by the above-mentioned method for determining gas channeling, the method for preventing channeling in the mode of first dynamically adjusting channeling prevention and then automatically preventing channeling or automatically preventing channeling directly is used based on the characteristics of gas channeling and the degree of gas channeling of the unit nitrogen flooding.

Description

technical field [0001] The invention belongs to the technical field of nitrogen flooding development of fractured-cavity oil reservoir units in carbonate rocks, and in particular relates to a method for judging gas channeling in nitrogen flooding of fractured-cavity oil reservoir units and a method for preventing channeling during injection and production. Background technique [0002] Unit nitrogen flooding has become a strategic successor technology after unit water flooding in fractured-vuggy reservoirs, but with the expansion of unit nitrogen flooding scale, the effect of nitrogen flooding varies greatly. Gas channeling occurred in some well groups, resulting in a significant reduction in nitrogen utilization, and some remaining oil between wells could not be fully produced, seriously affecting the efficient and stable production of unit nitrogen flooding. Due to the strong heterogeneity of fracture-vuggy reservoirs, the distribution of reservoirs between wells is divers...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B47/10E21B47/11E21B43/00E21B43/16E21B33/13
CPCE21B33/13E21B43/00E21B43/166E21B43/168E21B47/10E21B49/00
Inventor 刘中云李兆敏赵海洋何龙李宾飞冯一波王建海丁保东李松岩焦保雷杨利萍杨祖国鹿腾李婷婷魏芳李海霞
Owner CHINA PETROLEUM & CHEM CORP
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