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A Geological Layer Selection Method Based on Partial Pressure and Calculation of Natural Gas Multilayer System

A multi-layer, natural gas technology, applied in the fields of earthwork drilling, fluid extraction, measurement, etc., can solve the lack of sufficient interlayer interference fracturing technology measures, small permeability difference between layers, and large fluid seepage resistance, etc. problems, to achieve the effect of strong practical guiding significance, reasonable layer selection method, and saving investment cost

Active Publication Date: 2017-02-22
PETROCHINA CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the existing multi-layer superimposed tight sandstone gas reservoirs in the process of multi-layer co-production, due to the low reservoir permeability, large fluid seepage resistance, small difference in permeability between layers, and the impact of permeability on layers. Due to the limited influence of inter-interference, there is a lack of sufficient geological basis in the formulation of multi-layer gas test layer selection plan and fracturing reconstruction process measures, which affects the gas test effect

Method used

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  • A Geological Layer Selection Method Based on Partial Pressure and Calculation of Natural Gas Multilayer System
  • A Geological Layer Selection Method Based on Partial Pressure and Calculation of Natural Gas Multilayer System

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Embodiment 1

[0030] In order to overcome the influence of permeability on interlayer interference due to low reservoir permeability, high fluid seepage resistance, and small difference in interlayer permeability during the multilayer commingled production of existing multilayer superimposed tight sandstone gas reservoirs Due to the lack of sufficient geological basis in the formulation of multi-layer gas test layer selection plan and fracturing reconstruction process measures due to the limitation of gas test, this embodiment provides a method such as figure 1 The shown geological layer selection method based on partial pressure calculation of natural gas multi-layer series includes the following steps:

[0031] The first step is the single-layer capacity factor analysis, the specific process is as follows:

[0032] 1) According to the geological characteristics of tight sandstone reservoirs, according to the natural gamma ray logging response, combined with sedimentary facies types, rock ...

Embodiment 2

[0045] On the basis of embodiment 1, this embodiment adopts the geological layer selection method based on the natural gas multi-layer system pressure partial pressure combination calculation provided by the present invention for the test well m37 of a multi-layer system in a basin, and the results are as follows figure 2 shown.

[0046] During the first gas test of the test well m37 of the multi-layer system in a certain basin, a total of 9 gas layers were injected, namely Ma5 2 1 + horse five 2 2 , Taiyuan Group, Shan 2 2 , mountain 1, box 8 上 , Box 7, Box 6, and Box 3, the wellhead output is 1.9×10 4 m 3 / d low-production gas flow, compared with other single-well and single-layer gas test production in the same basin, the production increase is not obvious. And to the calculation and analysis of the gas production profile after the first gas test, by using the geological layer selection method based on the partial pressure of the natural gas multilayer system of the...

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Abstract

The invention belongs to the technical field of natural gas exploration and development, and particularly provides a geological stratum selection method based on natural gas multi-stratum series partial pressure combined solution. The method includes the following steps that firstly, single-stratum productivity factors are analyzed; secondly, multi-stratum series combined test inter-stratum interference is analyzed; thirdly, according to the analysis of the single-stratum productivity factors and the analysis of the multi-stratum series combined test inter-stratum interference, multi-stratum series gas test stratums are selected. The method is used for achieving geological stratum selection based on multi-stratum series partial pressure combined solution of a tight sandstone gas reservoir, is reasonable and guarantees accurate stratum selection based on multi-stratum series partial pressure combined solution of the tight sandstone gas reservoir. The method can increase the single-well yield, improve the exploration and development efficiency and lower the exploration and development cost and has great practical guiding significance.

Description

technical field [0001] The invention belongs to the technical field of natural gas exploration and development, and in particular relates to a geological layer selection method based on partial pressure and combined calculation of natural gas multilayer systems. Background technique [0002] Multi-layer series pressure division and combination calculation is a construction technology that can realize continuous pressure division and multiple stages at one time, and is easy to operate for the problem of multi-layer tight sandstone gas wells containing gas in multi-layer series and low gas production in single-layer test. It is an effective method to improve the producing degree of the reservoir, and it has a good application prospect in increasing the production of a single well in a vertical well. [0003] The prerequisite for the efficient development of multilayer reservoirs is to analyze interlayer interference, determine the degree of interlayer interference, and choose ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B49/00E21B43/26E21B47/06E21B47/04E21B43/14
Inventor 姚泾利康锐刘新社赵会涛王怀厂刘燕赵小会张辉贾亚妮刘晓鹏
Owner PETROCHINA CO LTD
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