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Production method for improving yield of small sand body tight gas reservoir

A production method and tight gas technology, which is applied in the fields of fluid extraction, earthwork drilling, sealing/isolation, etc., and can solve problems such as low permeability, low production, and no natural production capacity of gas wells

Active Publication Date: 2021-12-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Gas reservoirs have the four low characteristics of "low permeability, low pressure, low abundance, and low production". Gas wells have no natural production capacity and must undergo fracturing to obtain economic production.

Method used

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  • Production method for improving yield of small sand body tight gas reservoir
  • Production method for improving yield of small sand body tight gas reservoir
  • Production method for improving yield of small sand body tight gas reservoir

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The production method for improving the output of tight gas reservoirs with small sand bodies in this embodiment includes the following steps:

[0031] (1) Characteristics of tight gas reservoirs with small sand bodies

[0032] The target layer is a sandstone gas-bearing layer with a burial depth of 3000m. The reservoir temperature is 130°C. Vertically, the reservoir has many layers, large thickness, tight lithology and poor physical properties. On the plane, the oil and gas-bearing area is 0.1km 2 . Natural gas reserves 0.1×10 8 m 3 , condensate reserves 0.2×10 4 t.

[0033] The number of layers in the vertical direction of the sand body is 2 or more. The thickness of single layer sand body is <5m.

[0034] Rock compactness: compressive strength is 200MPa; elastic modulus is 45GPa; Poisson's ratio is 0.25; rock density is 2.4g / cm 3 .

[0035] Petrophysical properties: permeability 0.002×10 -3 μm 3 ; Porosity: 5%; Bound water saturation 40%.

[0036] Loggi...

Embodiment 2

[0059] The production method for improving the output of tight gas reservoirs with small sand bodies in this embodiment includes the following steps:

[0060] (1) The burial depth of the target layer is 3500m. The reservoir temperature is 132°C. Vertically, sandstone gas-bearing formations with many reservoir layers, large thickness, tight lithology and poor physical properties. On the plane, the oil and gas-bearing area is 0.2km 2 . Natural gas reserves 0.3×10 8 m3, condensate reserves 0.3×10 4 t.

[0061] The number of sand body layers is: more than 2 layers; the thickness of a single layer of sand body is > 5m;

[0062] Rock compactness: compressive strength is 210MPa; elastic modulus is 42GPa; Poisson's ratio is 0.22; rock density is 2.5g / cm 3 ;

[0063] The physical properties are: permeability 0.009×10 -3 μm3; porosity: 2%; irreducible water saturation 40%;

[0064] Logging parameters: resistivity 90Ω·m; acoustic time difference 200μs / m.

[0065] (2) Restructu...

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Abstract

The invention belongs to the technical field of oil field gas reservoir fracturing, and particularly relates to a production method for improving the yield of a small sand body tight gas reservoir. The number of sand body layers of the small sand body tight gas reservoir is more than two; the sand body sedimentary microfacies are estuary dam microfacies or underwater shunt channel microfacies; the compressive strength of the rock is 200 to 300 MPa; the elastic modulus is 40 to 50 GPa; the Poisson ratio is 0.2 to 0.3; and the rock density is 2.4-2.7 g / cm<3>. Fracturing transformation is carried out by comprising the following steps that (1), mechanical layering fracturing is adopted, and layer-by-layer construction is carried out from deep to shallow according to the depth; and (2), fracturing transformation is carried out according to the sand body sedimentary microfacies and rock properties, and volume fracturing is achieved. According to the production method for improving the yield of the small sand body tight gas reservoir, a specific fracturing mode is adopted according to the sedimentary facies and the lithologic property of the small sand body, the distribution efficiency of the proppant in the sand body is improved, and the gas production degree is improved.

Description

technical field [0001] The invention belongs to the technical field of oil field gas reservoir fracturing, in particular to a production method for increasing the production of tight gas reservoirs with small sand bodies, in particular to tight gas reservoirs with low permeability, low porosity and low abundance under different sedimentary microfacies mining technology. Background technique [0002] With the deepening of oil exploration and development, it is more difficult to find high-quality reserves, oil resources are dwindling, and gas prices continue to rise. How to improve its recovery has become a top priority. Henan Oilfield is rich in natural gas resources, and the characteristics of natural gas reservoirs such as low permeability, early water breakthrough of gas wells, and low production after perforation seriously restrict the economical and effective development of such reservoirs. [0003] The natural gas geological reserves of deep condensate gas reservoirs i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B33/13
CPCE21B43/26E21B43/261E21B43/267E21B33/13
Inventor 李梦楠冯兴武李博解勇珍刘正奎郑壮李展杨少春
Owner CHINA PETROLEUM & CHEM CORP