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New method for dividing water injection layer sections of offshore water injection well

A technology for water injection wells and water injection layers, which is used in earth-moving drilling, wellbore/well components, and production fluids, etc., and can solve the problems of large difference in water absorption between layers, low qualification rate of layers, uneven advancement of injected water, etc. Simple application and clear technical ideas

Inactive Publication Date: 2017-06-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] With the development of water injection, the problems of water wells are becoming more and more prominent, mainly manifested in the low qualified rate of layers, the large difference in water absorption between layers, and the injection water presents uneven advancement between layers, planes, and layers, resulting in poor water flooding effect

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  • New method for dividing water injection layer sections of offshore water injection well

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Embodiment Construction

[0013] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below in conjunction with the drawings, which are described in detail as follows.

[0014] Such as figure 1 As shown, figure 1 It is a flowchart of a new method for dividing water injection intervals of offshore water injection wells of the present invention.

[0015] In step 101, the basic parameters of the reservoir are collected and a conceptual model of the reservoir is established.

[0016] In step 102, the numerical simulation method is used to study the influence of the permeability difference, the thickness difference, the number of small layers in the section, the degree of flooding of each layer and the pressure difference on the uniformity of water injection well, and the sensitivity analysis of each factor is performed. Determine the separate injection limit standard for water injection wells.

[0017] In step 103, th...

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Abstract

The invention provides a new method for dividing water injection layer sections of an offshore water injection well. The new method for dividing the water injection layer sections of the offshore water injection well includes the following steps: a step 1, comprehensively considering the permeability gradational difference, the thickness gradational difference, the number of small layers in each layer, the water logging degree of each layer and the pressure difference so as to determine a water injection well layered injection boundary standard through a numerical simulation method; a step 2, counting the number of layers, the sand thickness, the permeability, the water logging degree and pressure distribution of an injection opened layer position of an existing layer section of the water injection well, and calculating the thickness gradational difference and the permeability gradational difference of each water injection layer section; a step 3, performing layer section primary division on the water injection well according to the layered injection boundary standard; and a step 4, considering the water injection process, performing suitable adjustment, and acquiring a final division result. The new method for dividing the water injection layer sections of the offshore water injection well is clear in thinking , is simple to apply, is feasible in offshore and similar oil reservoir water injection well layer section division.

Description

Technical field [0001] The invention relates to the technical field of subdivision water injection of offshore oil reservoirs, in particular to a new method for dividing water injection intervals of offshore water injection wells. Background technique [0002] Offshore oil reservoirs are fluvial deposits, with strong reservoir heterogeneity. Generally, multiple sets of oil layers are developed vertically, and the physical properties of each oil layer are quite different. In order to reduce interlayer interference, water injection wells basically use staged water injection. In the early days, they were mostly in the first two stages and two stages and three stages. Due to the limitations of the technology at the time, the division of water injection intervals for water injection wells also considered the difference in reservoir physical properties. However, the main consideration is the technological factor and the oil reservoir factor as a supplement. [0003] With the developmen...

Claims

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Application Information

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IPC IPC(8): E21B43/20E21B43/01
CPCE21B43/20E21B43/01
Inventor 唐晓红姜书荣翟亮赵红霞石达友郭敏彭道贵刘利张巧莹李健刘敏刘丽陈恺
Owner CHINA PETROLEUM & CHEM CORP
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