Method for calculating controlled reserves of fractured single well

A reserve calculation and fracturing technology, which is applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as difficulty in meeting the requirements of low-permeability and ultra-low-permeability reservoir control reserve calculation, and achieve improved crude oil recovery. efficiency, the effect of optimizing the production system

Pending Publication Date: 2021-07-27
SHAANXI YANCHANG PETROLEUM GRP
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AI Technical Summary

Problems solved by technology

For the calculation of the controlled reserves of a fracturing single well, the above calculation methods have limitations, and it is difficult to meet the requirements for the calculation of the controlled reserves of a single well in low-permeability and ultra-low-permeability reservoirs

Method used

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  • Method for calculating controlled reserves of fractured single well
  • Method for calculating controlled reserves of fractured single well
  • Method for calculating controlled reserves of fractured single well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] Taking block S in Fuxian area of ​​Yanchang Oilfield in the south of Ordos Basin as an example to carry out specific analysis and illustration, the target layer in the study area is 8 2 1 The sub-layer mainly develops the delta front subfacies, the single sand body of the underwater distributary channel is the main reservoir sand body, and the main provenance direction is northeast-southwest.

[0040]Concrete experimental example 1--vertical well and directional well carry out the fracturing single well control reserve calculation of this district with the method provided by the present invention, and concrete process is:

[0041] (1) Use core facies and logging facies to identify, predict and quantify the interface of different levels of reservoir architecture in the vertical and lateral directions, combine the results of quantitative characterization of the interface of different levels of reservoir architecture and the reservoir structure Based on the model theory, ...

experiment example 2

[0054] Specific experimental example 2--horizontal well

[0055] Horizontal well XX is located in the middle of the study area, and the horizontal section of the well mainly encountered Chang 8 2 1 No. 3 single sand body in the small layer, the well was fractured and put into production on May 19, 2014 using large-scale volume fracturing (sand addition 560.0m 3 ), a total of 11 stages of fracturing were performed. During the fracturing period, downhole microseismic monitoring was used to monitor the fracturing fractures. The monitoring well was L96-2 water injection well. The distance between the wellheads of the two wells was 364m, and the distance between the perforation section and the geophone in the horizontal section was 425-619m In between, the monitoring results showed that a complex “network fracture” system formed by main fractures and branch fracture systems was formed in the horizontal section of the well.

[0056] Carry out the fracturing single well control res...

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Abstract

The invention relates to a method for calculating controlled reserves of a fractured single well, which comprises the following steps of: establishing vertical and lateral configuration modes of a single sand body so as to obtain distribution characteristics of the single sand body in the vertical direction and the lateral direction; further determining seepage rule characteristics of fluid in different single sand bodies; obtaining the shape parameters and the three-dimensional airspace volume of the fractures in the single-well fractured interval; taking the sum of the volume V1 of the fracture control unit of the foundation fracturing fracture and the seepage volume V2 of the matrix unit as the volume V of the fracture control unit after single well fracturing; and calculating the control reserves in the fracture control unit volume V after single well fracturing by using a grid volume fraction method, and accumulating and obtaining the final control reserves of the fractured single well. According to the method provided by the invention, the oil field development scheme is formulated in a targeted manner, so that the reasonable production system of a single well is optimized, the crude oil recovery rate is improved, and the purpose of economic benefit development of low-permeability and ultra-low-permeability oil reservoirs is finally achieved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and in particular relates to a method for calculating the controlled reserves of a fracturing single well. Background technique [0002] my country's low-permeability and ultra-low-permeability reservoirs have huge proven oil geological reserves, accounting for about 54% of the total reserves. In recent years, the proportion of ultra-low permeability and other low-grade oil reserves in newly added oil reserves has exceeded 70%. Single wells in low-permeability and ultra-low-permeability reservoirs are put into production after fracturing. The complex fracture system formed in the reservoir after fracturing is the main channel for oil and gas seepage, and it is also an important factor determining the production of a single well. The scale of single well controlled reserves is directly related to the formulation of oilfield development plan, adjustment plan and sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/22
CPCG06F30/20G06F2119/22
Inventor 梁卫卫赵习森党海龙刘滨张亮王伟孙欣华侯玢池王谦张天龙王强王小锋崔鹏兴刘明军王崟
Owner SHAANXI YANCHANG PETROLEUM GRP
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