Dense sandstone-shale reservoir stratum crack net fracturing development well spacing method

A sand-mudstone and fracture network technology, which is applied in the well layout field of fracture-network fracturing development, can solve the problems of high well pattern density, low single well productivity, and tight sand and mudstone reserves cannot be used economically and effectively, and achieve well pattern density The effect of reducing the size and saving the drilling cost

Inactive Publication Date: 2015-04-29
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in China, regular reverse nine-point and rectangular well patterns are mainly used to arrange wells. Due to the high density of well patterns and low productivity of single wells, tight sand and mudstone reserves cannot be used economically and effectively.

Method used

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  • Dense sandstone-shale reservoir stratum crack net fracturing development well spacing method
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  • Dense sandstone-shale reservoir stratum crack net fracturing development well spacing method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1 : Fracture-network fracturing of tight sand and mudstone reservoirs in Zhouzhou 602-4 well area

[0037] The Fuyang oil layer is developed in the sand body of this block, and the main layer is the FI1-7 layer, and the sand body is scattered on the plane, and the continuity is poor. Well layout according to the original rectangular well pattern water injection development method, as attached figure 1 As shown, the wells are arranged according to the 300m×100m well pattern, and a total of 26 wells need to be drilled.

[0038] The method of releasing wells by fracture network fracturing in tight sand and mudstone reservoirs is implemented as follows:

[0039] 1. Design of well row direction:

[0040] According to the electrical imaging logging analysis, it is determined that the maximum principal stress direction of the rock is 110 degrees northeast, so the direction of the well row is arranged according to this angle.

[0041] 2. Design of oil well spacin...

Embodiment 2

[0047] Example 2: Well release method for tight sand and mudstone reservoir fracture network fracturing development in Zhou 602-7 well area

[0048] The Fuyang oil layer is developed in the sand body of this block, and the main layer is the FI1-7 layer, and the sand body is scattered on the plane, and the continuity is poor. Well layout according to the original rectangular well pattern water injection development method, such as image 3 As shown, the wells are arranged according to the 300m×100m well pattern, and a total of 14 wells need to be drilled. The method of releasing wells by fracture network fracturing in tight sand and mudstone reservoirs is implemented as follows:

[0049] 1. Design of well row direction:

[0050] Firstly, according to the electrical imaging logging analysis, it is determined that the maximum principal stress direction of the rock is 90 degrees to the northeast, so the direction of the well row is arranged according to this angle.

[0051] 2...

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Abstract

The invention discloses a dense sandstone-shale reservoir stratum crack net fracturing development well spacing method, and aims at solving problems that since well spacing is carried out by mainly adopting regulated inverted nine-spot and rectangular well net manners and the like in China, the well net density is great and the yield of a single well is low. The dense sandstone-shale reservoir stratum crack net fracturing development well spacing method particularly comprises the following steps of carrying out the well spacing in a well arraying direction according to a maximum main stress direction of a stratum; determining a crack net range and an oil well space according to a sand body development scale; determining an injection-production arraying distance and the oil well distance according to corresponding formulas on the basis of the difference of a water injection manner and a non-water-injection manner; and finally, carrying out a development and production manner of crack net fracturing on all the oil wells. With the adoption of the well spacing method, the well net density is obviously reduced, so that the well drilling cost is greatly saved and the low-cost and efficient development aim is finally realized.

Description

technical field [0001] The invention relates to a well layout method for fracturing development, in particular to a well layout method for tight sand and mudstone reservoirs developed by fracture network fracturing. Background technique [0002] At present, the development of tight sandstone and mudstone reservoirs in foreign countries is mainly developed by volume fracturing of horizontal wells, and a well layout method using volume fracturing of horizontal wells has been established. The well layout method of horizontal well volume fracturing development is not suitable for fracture network fracturing development. Therefore, in China, regular reverse nine-spot and rectangular well patterns are mainly used to arrange wells. Due to the high density of the well pattern and the low productivity of a single well, tight sand and mudstone reserves cannot be used economically and effectively. Contents of the invention [0003] The object of the present invention is to provide a...

Claims

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Application Information

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IPC IPC(8): E21B43/26
CPCE21B43/26E21B43/30
Inventor兰中孝张有才金岩松兰乘宇汪玉梅杨光杨玉才
OwnerPETROCHINA CO LTD