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A dynamic profile control and blockage prediction method and system based on inter-well connectivity

A technology for interwell connectivity and dynamic prediction, applied in earthwork drilling, wellbore/well components, special data processing applications, etc., can solve the problem of complex seepage mechanism, inability to calculate quickly, failure to consider shutting down wells and oil well transfer, etc. question

Pending Publication Date: 2019-06-28
YANGTZE UNIVERSITY
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

In order to improve the contradiction between injection and production, profile control and water shutoff technology has become an important process modification measure in oilfield water injection development. However, the current numerical simulation technology for profile control and water shutoff is not mature enough, and it is difficult to accurately simulate and predict the dynamics of profile control and water shutoff. Coupled with unclear understanding of formation connectivity rules and dominant flow channels, on-site profile control and water plugging measures have a low overall success rate, poor effectiveness, and rapid failure
Reservoir simulation prediction for profile control and water plugging has always been a difficult point in oilfield development research. The main problems are: various types of plugging agents, complicated seepage mechanism, and difficult to describe in detail; At the same time, it is difficult to accurately simulate and optimize the scheme without integrating the information of the dominant flow channel connected between wells, and it is difficult to achieve large-scale application
However, these models have problems such as the model is too ideal, the inversion parameters have no clear geological significance, and the shutdown of wells and the transfer of oil wells cannot be considered.

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  • A dynamic profile control and blockage prediction method and system based on inter-well connectivity
  • A dynamic profile control and blockage prediction method and system based on inter-well connectivity
  • A dynamic profile control and blockage prediction method and system based on inter-well connectivity

Examples

Experimental program
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Effect test

Embodiment 1

[0136] Embodiment 1 takes a water injection well as an example to briefly introduce the plugging regulation and prediction process. Such as Figure 5 As shown, I1 is a water injection well connected to 4 production wells, and each connected unit in the figure is marked with conductivity and connected volume (unit: ten thousand square meters); Figure 6 is the splitting coefficient from well I1 to 4 production wells at the current moment. Taking Well I1 as the plugging adjustment well, and assuming that the injected plugging dose is 350 m3, the plugging agent input volumes to the four connected units of P1, P2, P3, and P4 wells are 17.5, 122.5, 157.5, and 52.5 m3 respectively. Figure 7 shown. According to the ratio of the amount of plugging into each connected unit to the connected volume, it can be determined that the dimensionless injection multiples of the four connected units are about 0.0088, 0.082, 0.21, and 0.0044; Figure 4 According to the relationship curve shown,...

Embodiment 2

[0138] Example 2 is an example of the concept of heterogeneity. A two-dimensional heterogeneous reservoir model is established using a commercial numerical simulator. Five injection and four production well patterns are used. The reservoir grid is divided into 25×25×1, X, Y and The grid sizes in the Z direction are 25m, 15m and 15m. The real permeability field of the model is as Figure 9 As shown, there are high-permeability areas and low-permeability areas, the average porosity is 0.2, the initial oil saturation is 0.8, and the initial reservoir pressure is 25MPa. The production data of 1800 days of simulated production are used for history matching.

[0139] History matching single well fitting such as Figure 10a~10b As shown, this method has a good consistency with the numerical simulation method. Figure 11 shows the corresponding situation between the splitting coefficient calculated by the model and the real flow field of the model. accuracy. The connected characteri...

Embodiment 3

[0142] Embodiment 3 is an actual calculation example. The plugging adjustment dynamic prediction method proposed by the present invention is applied to an actual low-permeability oil field. This oil field started production in 2011, with a total of 250 wells, of which 80 water injection wells, with an average permeability of 20mD , the average porosity is 0.108, the initial reservoir pressure is 20MPa, and the block connectivity inversion results are as follows Figure 14 . The block fit is as follows Figure 15a , 15b, the fitting correlation coefficient of block accumulative oil production is 94.1%, and the fitting correlation coefficient of block water cut is 88.3%.

[0143] Based on the connectivity calculation results, 13 wells with low water injection efficiency were selected for dynamic optimization of plugging regulation. According to the field experiment and indoor experiment, the scatter point of the plugging agent on the decrease of conductivity is obtained, and ...

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Abstract

The invention belongs to the technical field of profile control and water plugging, and particularly relates to a profile control and water plugging dynamic prediction method and system based on interwell connectivity. An inter-well connectivity model capable of simulating the oil-water dynamic state is established by utilizing an oil field daily production dynamic state and a material balance method, parameters such as inter-well connectivity conductivity, communication volume, water injection splitting and water injection efficiency can be obtained, and an inter-well dominant communication relationship is quantitatively identified; And based on the obtained communication relationship, the plugging agent plugging capability evaluation result is combined, flow treatment is carried out along the communication unit, and the method capable of rapidly simulating and predicting the profile control and water plugging dynamic state is established. Compared with the traditional digital-analogcalculation, the method is simple and reliable, and can be seamlessly jointed with the identification of a crossflow dominant channel, so that the overall decision of optimal selection, dynamic prediction and dosage optimization of the profile control well is realized, and the design and application of a field profile control scheme are guided.

Description

technical field [0001] The invention belongs to the technical field of profile control and water plugging, in particular to a dynamic prediction method and system for plugging regulation and plugging based on inter-well connectivity. Background technique [0002] At present, water flooding development is still the main development method of most oilfields in my country. After a long period of development, the underground seepage system has undergone major changes, the contradiction between injection and production has become increasingly prominent, water flooding has serious invalid water circulation, and multi-level dominant flow fields coexist and are difficult to identify. It is increasingly difficult to stabilize oil and control water. In order to improve the contradiction between injection and production, profile control and water shutoff technology has become an important process modification measure in oilfield water injection development. However, the current numerica...

Claims

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Application Information

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IPC IPC(8): G06F17/50E21B43/20E21B33/13
Inventor 曹琳赵辉王倩盛广龙刘伟史永波李国浩
Owner YANGTZE UNIVERSITY
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