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Fracture-cavern type carbonate oil reservoir single well water injection oil substituting effect quantitative evaluation method

A technology for replacing oil by water injection in carbonate reservoirs, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., and can solve problems such as poor adaptability of quantitative evaluation

Active Publication Date: 2016-06-01
PETROCHINA CO LTD
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Problems solved by technology

However, due to too much reliance on subjective judgments in determining the important order of influence of each factor index and setting the weight of the evaluation factor set, the traditional fuzzy evaluation theory is not suitable for single wells in fractured-cavity carbonate reservoirs with many media types and large scale differences. Poor adaptability to quantitative evaluation of oil replacement effect by water injection

Method used

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  • Fracture-cavern type carbonate oil reservoir single well water injection oil substituting effect quantitative evaluation method
  • Fracture-cavern type carbonate oil reservoir single well water injection oil substituting effect quantitative evaluation method
  • Fracture-cavern type carbonate oil reservoir single well water injection oil substituting effect quantitative evaluation method

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Effect test

Embodiment 1

[0053] This example quantitatively evaluates the development effect of single-well water injection for oil replacement in Ordovician M fractured-vuggy carbonate reservoirs in Tarim Oilfield. The main effective storage space of this oil reservoir includes large caves, secondary dissolution pores and high-angle fractures, etc. It is an unsaturated oil reservoir with a large ground-saturation pressure difference between 35-66 MPa, with an average of 50.5 MPa. The formation crude oil is mainly Light crude oil with low viscosity, low sulfur, moderate colloid-asphaltene content, high wax content, density 0.82-1.10g / cm 3 , the volume coefficient is 1.04-1.66, the average formation pressure is 73.3MPa, and the average formation temperature is 154.4°C, which is a normal temperature-pressure system.

[0054] In this embodiment, the dynamic and static data of 36 representative water injection and oil replacement wells of M fractured-cavity carbonate reservoirs in the Tarim Oilfield are s...

Embodiment 2

[0087] Weighted Average Fuzzy Synthesis Operator Based on Mathematical Model of Fuzzy Transformation

[0088]

[0089] Among them, b is the degree of membership of the evaluation effect of the jth level; a i is the weight value of the i-th evaluation factor; s ij is the degree of membership that the i-th evaluation factor belongs to the evaluation effect of the j-th grade; p is the number of evaluation factors in the evaluation factor set U; m is the dimension of the comment set V. Firstly, the fuzzy evaluation of the second-level factor indicators of the single-well water injection oil replacement development effect of each oil well in the whole oilfield is carried out, and then the fuzzy comprehensive evaluation is carried out on the first-level factor indicators of each oil well. Figure 4 It is the evaluation result of 36 water injection replacement wells in the Ordovician M fracture-vuggy carbonate reservoir in Tarim Oilfield. Table 4 shows the factor index values ​​...

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Abstract

The invention provides a fracture-cavern type carbonate oil reservoir single well water injection oil substituting effect quantitative evaluation method. The method comprises the following steps that a hierarchical fuzzy subset is set up, quantitative evaluation of the membership degree of all grades of evaluation elements is conducted, and a membership matrix S is obtained; the weight function of all the evaluation elements is determined, and an elevation weight vector A is obtained; the elevation weight vector A and the membership matrix S are calculated by using a fuzzy transformation mathematic model, and a fuzzy comprehensive evaluation measure value vector quantity B is obtained; and a final comprehensive evaluation result is determined through the maximum membership principle. The hierarchical fuzzy subset comprises an evaluation element set U and an evaluation set V. The corresponding expression of the fuzzy transformation mathematic model is shown in the specification, wherein b is a membership degree belonging to a j grade evaluation effect, and ai is the weight value of an i elevation element; sij is a membership degree that the i elevation element belongs to the j grade evaluation effect; p is the number of elevation elements in the evaluation element set U; m is the dimension number of the evaluation set V.

Description

technical field [0001] The invention belongs to the field of water injection oil replacement development of oil reservoirs, and relates to a method for quantitatively evaluating the development effect of single well water injection oil replacement by integrating different dynamic and static data, in particular to a single well water injection oil replacement of fracture-cavity carbonate reservoirs Quantitative evaluation method of effect. Background technique [0002] Fractured-cavity carbonate reservoirs have various types of storage spaces, prominent heterogeneity contradictions, and complex oil-water relationships. This type of complex lithology reservoirs has many advantages in efficient development, large-scale production and stable production, reservoir description and fluid flow rules. There are still many problems in terms of analysis and enhanced oil recovery. At present, single-well water injection for oil replacement has become the leading technology for further ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B49/00
CPCE21B43/20E21B49/00
Inventor 王代刚李勇李保柱张丽娟陈方方邓兴梁彭得兵王琦刘志良佘治成谭柱付冰
Owner PETROCHINA CO LTD
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