Method for determining plugging length of horizontal well of fractured water breakthrough oil well and plugging method

A determination method and technology for horizontal wells, which are applied in the directions of sealing/isolation, wellbore/well components, earth-moving drilling, etc., which can solve the problem of affecting the recovery degree of oil reservoirs, reducing the drainage area of ​​horizontal wells, and secondary inrush of injected water. And other issues

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in water injection development, plugging the main water outlet section of the horizontal well cannot effectively control the water cut rise rate of the oil well.
As the injection pressure of the water injection well increases, the horizontal well will open the rest of the artificial fractures to communicate with the natural fractures, resulting in a second burst of injected water, which will continue to increase the water content and ultimately affect the water shutoff effect
In addition, if the well section is simply and greatly blocked for the main water section of the horizontal well of the oil well, the length of the effective production well section of the horizontal well will be reduced, the drainage area of ​​the horizontal well will be reduced, and oil loss will be caused, which will eventually affect the quality of the reservoir. Extraction degree

Method used

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  • Method for determining plugging length of horizontal well of fractured water breakthrough oil well and plugging method
  • Method for determining plugging length of horizontal well of fractured water breakthrough oil well and plugging method
  • Method for determining plugging length of horizontal well of fractured water breakthrough oil well and plugging method

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Experimental program
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Effect test

Embodiment 1

[0058] In this embodiment, taking the A1 well group with direct injection and horizontal production developed in the fractured reservoir of the H Oilfield as an example, the plugging length of the horizontal well of the fractured water breakthrough well is quantitatively optimized according to the method of the present invention.

[0059] The method for determining the plugging length of the horizontal well of the fractured water breakthrough oil well in this embodiment is as follows: figure 1 shown, including the following steps:

[0060] 1) Establish a dual-media 3D numerical model to characterize the characteristics of fractured reservoirs:

[0061] ①Use the electrical data and core data of all single wells in the target area (that is, the area where the A1 well group is located), and combine the regional sedimentary markers and the development of stable mudstone interlayers and physical interlayers to determine the sublayer division scheme; use the sublayer division scheme...

Embodiment 2

[0084] The method for determining the plugging length of the fractured water-through oil well and the horizontal well of the present embodiment is carried out in the following order according to the steps of Embodiment 1: step 3), step 1), step 2), step 4), step 5) , step 6).

Embodiment 3

[0086] The method for determining the plugging length of the fractured water breakthrough oil well and the horizontal well of this embodiment is only different from that of Embodiment 1 in that: the water flooding swept volume coefficient is calculated by using the cumulative oil production, comprehensive water content, and crude oil viscosity, etc. The calculation method of water drive volumetric sweep coefficient is:

[0087]

[0088] In the formula, E v is water flooding volumetric sweep coefficient; B oi is the crude oil volume coefficient in the initial state of the reservoir; B o is the volume factor of crude oil under current conditions; f w is the comprehensive water cut of the reservoir, %; N p is the cumulative oil production, 10 4 t; N is crude oil geological reserves, 10 4 t; μ w is formation water viscosity, mPa·s; μ o is the viscosity of crude oil, mPa s; S wi is bound water saturation, %; S or is the final residual oil saturation, %.

[0089] a, b a...

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Abstract

The invention relates to a method for determining the plugging length of a fractured water breakthrough oil well horizontal well and a plugging method, and belongs to the technical field of petroleum and natural gas exploration and development. The determination method comprises the following steps: 1) determining a main water outlet section of the oil well horizontal well; 2) predicting the comprehensive water content and the water drive volume sweep coefficient of the oil reservoir injection-production well group under different plugging schemes; various plugging schemes take the main water outlet section as the center, and the plugging length proportions of the well sections are different; the plugging section of each plugging scheme comprises a main water outlet section; and (3) weighted averaging is conducted on the comprehensive water content and the water flooding wave and volume coefficient of each plugging scheme, evaluation index parameters are obtained, and then the plugging length of the horizontal well of the oil well of the seamed reservoir is determined. The method can achieve the purposes of reducing water and increasing oil, reducing invalid displacement of injected water, guiding a fractured reservoir injection-production well group to carry out water plugging measures, improving the water injection wave and volume of the fractured reservoir and effectively supplementing stratum energy, and finally achieving the purpose of improving the development effect of the fractured reservoir.

Description

technical field [0001] The invention relates to a method for determining the plugging length of a fractured water-through oil well and a horizontal well, and a plugging method, belonging to the technical field of petroleum and natural gas exploration and development. Background technique [0002] Low-permeability fractured reservoirs have strong heterogeneity, natural fractures and micro-fractures are developed, artificial fractures are complex after multi-stage fracturing in horizontal wells, and it is easier to form natural fractures between fractures and water injection wells during water injection development. The permeability of the reservoir matrix is ​​much lower than the permeability of the fractures. Therefore, during the water injection development process, the injected water can easily flow into the wellbore directly along the high permeability fractures, resulting in ineffective displacement by water injection, and eventually resulting in fracture water flooding a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/20E21B43/26E21B47/00E21B47/07G06Q50/02G06T17/05
CPCE21B33/13E21B47/00E21B43/26E21B43/20G06Q50/02G06T17/05Y02A90/10
Inventor 马艳艳张凌筱陈红胡列侠孔海瑞盛卫华吴凡肖曾金
Owner CHINA PETROLEUM & CHEM CORP
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