Multi-layer stacked tight gas reservoir development method and well type selection method

A technology for tight gas and gas reservoirs, applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc., can solve problems such as shortage, systematic evaluation of horizontal well development effects, etc., and achieve the effect of increasing production and recovery

Active Publication Date: 2020-03-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lack of a complete evaluation system for the development effect of horizontal wells, and no systematic evaluation of the development effect of horizontal

Method used

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  • Multi-layer stacked tight gas reservoir development method and well type selection method
  • Multi-layer stacked tight gas reservoir development method and well type selection method
  • Multi-layer stacked tight gas reservoir development method and well type selection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] In this example, the development effect of the medium and shallow multi-layer superimposed tight gas reservoirs in a certain area is analyzed, as shown in figure 1 As shown, the multi-layer stacked tight gas reservoir development method in this embodiment includes the following steps:

[0060] A. According to the sand thickness and distribution characteristics of the reservoir, classify the reservoir types of multi-layer superimposed tight gas reservoirs;

[0061] B. Carry out dynamic analysis of gas reservoir production, compare the dynamic indicators of gas reservoir vertical wells and horizontal wells, and clarify the dynamic differences;

[0062] C. Analyze the causes of dynamic differences and study the main controlling factors affecting the productivity of horizontal wells;

[0063] D. Carry out feasibility analysis of multi-layer commingled mining technology, and clarify the boundaries of vertical well multi-layered commingled mining;

[0064] E. Form the concl...

Embodiment 2

[0097] Such as Figure 1 to Figure 5 As shown, according to the multi-layer superimposed tight gas reservoir development method described in Example 1, this embodiment analyzes the vertical well multi-layer commingled production limit in step D, and establishes a double-layer gas reservoir with numerical simulation technology according to the gas reservoir physical properties, temperature and pressure system. Layer-free channeling-free homogeneous gas reservoir model, with a burial depth of 2300m at the model base, a porosity of 0.1076, and a permeability of 0.19×10 -3 μm 2 , the vertical permeability is zero, the effective thickness of the reservoir is 10 meters, the original formation pressure is 42.3MPa, and the numerical calculation grid is 30×30×3. In the model, only the upper and lower layers are the target layers, and the middle is the impermeable barrier layer, the total reserve of the model is 1.43×10 8 m 3, given that the output of two layers of combined mining an...

Embodiment 3

[0111] Based on the multi-layer superimposed tight gas reservoir development methods described in Embodiment 1 and Embodiment 2, this embodiment provides a well type selection method, which evaluates the well type adaptability based on the development effects of horizontal wells in different reservoirs, and then evaluates the well type The applicable well types of the three types of reservoirs are selected:

[0112] Type I reservoirs: both horizontal and vertical wells are suitable, but vertical wells are more economical; H≥23m, K≥0.11m, S w ≤50%;

[0113] Type II reservoir: some suitable for vertical wells, some suitable for horizontal wells; H: 16-20m, K≥0.15mD, S w ≤54%, horizontal wells should be used; H:20-23m, K≥0.17mD, S w ≤54%, using vertical wells;

[0114] Type III reservoirs: a few areas can be developed by horizontal wells; H: 10-16m, K≥0.2mD, S w ≤ 58%, developed by horizontal wells;

[0115] Among them, H is the effective thickness, K is the permeability, S ...

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Abstract

The invention discloses a multi-layer stacked tight sandstone gas reservoir development technology. The multi-layer stacked tight gas reservoir development method comprises the following steps that according to the reservoir sand thickness and distribution characteristics, multi-layer stacked tight gas reservoir type division is conducted; gas reservoir production dynamic analysis is carried out,dynamic indexes of a gas reservoir vertical well and a horizontal well are compared, and dynamic differences are defined; dynamic difference reason analysis is carried out, and main control factors influencing the horizontal well productivity are studied; the feasibility of a multi-layer commingled production technology is analyzed, and a multi-layer commingled production boundary of the verticalwell is defined; conclusions of differential development are formed. According to the development method, a favorable deployment area, a reasonable deployment mode and a reasonable production system of the horizontal well and the vertical well can be defined, a targeted development technical countermeasure is formed, a quantitative evaluation system for screening parameters of the horizontal welland the vertical well is achieved, and data support is provided for improving the yield and the recovery ratio of a low-permeability tight gas reservoir.

Description

technical field [0001] The invention relates to a development technology of multi-layer superimposed tight sandstone gas reservoirs, in particular to a multi-layer superimposed tight gas reservoir development method and a well type selection method. Background technique [0002] Tight sandstone gas resources are abundant and widely distributed. There are about 70 basins in the world where tight gas has been discovered or speculated to develop, and the resource volume is about 210×1012m 3 , are distributed in Asia-Pacific, North America, Latin America, the former Soviet Union, the Middle East-North Africa and other regions, among which Asia-Pacific, North America, and South America respectively have tight gas resources accounting for more than 60% of the global tight gas resources. Tight sandstone gas reservoirs have been explored and developed for many years, and tight sandstone gas reservoirs have been discovered in the United States, Canada, Russia, China and other countr...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/02E21B43/30
CPCG06Q10/06393G06Q50/02E21B43/30E21B43/305
Inventor 刘成川王勇飞卜淘高伟刘露曹廷宽杨建曾宪兵袁霞张玉学甘文兵
Owner CHINA PETROLEUM & CHEM CORP
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