Fracturing method for shallow layer dense oil reservoir horizontal seam

A technology for tight oil reservoirs and horizontal fractures, which is used in earth-moving drilling, wellbore/well components, and production fluids. The effect of horizontal reserves producing degree, increasing volume and improving oil production of oil wells

Active Publication Date: 2020-09-15
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for shallow tight oil reservoirs, due to the shallow burial of the reservoir (less than 650m), fracturing forms horizontal fractures. Although the existing fracturing methods can improve the recovery of the reservoir to a certain extent, the The vertical and horizontal production degree of the horizontal fractures is low, and the reservoir stimulation is insufficient, resulting in poor development effect and affecting the recovery rate. Therefore, it is necessary to propose a plan for fracturing horizontal fractures in shallow tight reservoirs.

Method used

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  • Fracturing method for shallow layer dense oil reservoir horizontal seam
  • Fracturing method for shallow layer dense oil reservoir horizontal seam
  • Fracturing method for shallow layer dense oil reservoir horizontal seam

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Embodiment 1

[0026] The main idea of ​​the fracturing method for horizontal fractures in shallow tight oil reservoirs is that since the fractures formed by fracturing in shallow tight oil reservoirs are mainly horizontal fractures, when the present invention performs horizontal fracture fracturing, when fracturing On the basis of the main fractures, more vertical fractures or T-shaped fractures are created, so that the horizontal fractures form a complex fracture network, fully transform the reservoir, expand the volume of stimulation, and increase oil production.

[0027] In this embodiment, new wells are fractured. Generally, the first layer of main fractures is fractured for new wells, and subsequent fracturing can be continued if necessary. Bedding fractures are avoided when perforating new wells. Specifically, shallow tight oil reservoirs Fracturing methods for horizontal fractures, such as figure 1 shown, including the following steps:

[0028] 1) Select the fracturing interval

[...

Embodiment 2

[0065] The main idea of ​​the fracturing method of this embodiment is the same as that of the first embodiment, the difference is that the fracturing method of this embodiment is to perform repeated fracturing on old wells, that is, perform fracturing reconstruction of multi-layer reservoirs. The fracturing of each layer includes the pre-fluid stage, the sand-carrying fluid stage and the displacement stage. After the fracturing of each layer is completed, the fractured reservoir is sealed, and then other reservoirs are fractured.

[0066] Specifically, the fracturing method for horizontal fractures in shallow tight oil reservoirs includes the following steps:

[0067] 1) Select the fracturing interval;

[0068] 2) Run the fracturing string, install the wellhead, and test the pressure of the surface pipeline;

[0069] 3) Fracturing pumping construction of the first layer of fracture network: pre-fluid stage;

[0070] 4) Fracturing pumping construction of the first layer of fr...

Embodiment 3

[0103] The main idea of ​​the fracturing method in this embodiment is the same as that in Embodiment 1, the difference is that, when filling the branch fractures, the medium-viscosity fracturing fluid with the second displacement is added with medium particle size and medium-sand ratio support In this case, the newly generated micro-fractures are ignored, but the effect of filling branch fractures can also be achieved.

[0104] The remaining steps of the fracturing method are the same as those in Embodiment 1, and will not be repeated here.

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Abstract

The invention relates to a fracturing method for a shallow layer dense oil reservoir horizontal seam, and belongs to the technical field of oil-gas well fracturing yield increase. The fracturing method comprises the following steps that a main seam is opened and expanded; micro-seams are opened and expanded; the micro-seams are filled; seam ends are plugged; when the net pressure is larger than the difference between the maximum stress and the minimum stress, branch seams are opened and expanded; the branch seams are filled; the main seam is filled; and displacement operation is conducted, andfracturing of the horizontal seam is completed. According to the method, the micro-seams are formed in the main seam of the horizontal seam, the micro-seams are expanded and filled, and the seam endsare plugged, so that the branch seams are formed, then the branch seams and the main seam are filled, and fracturing of the horizontal seam is completed; and through fracturing of the horizontal seam, complex seams such as a vertical seam or a T-shaped seam are formed on the basis of the horizontal seam, so that the effective transformation size is increased, a reservoir is fully transformed, thelongitudinal and planar reserve utilization degree of an oil layer of a shallow layer dense oil reservoir is improved, and the oil yield of an oil well is increased.

Description

technical field [0001] The invention relates to a fracturing method for horizontal fractures of shallow tight oil reservoirs, and belongs to the technical field of fracturing and stimulation of oil and gas wells. Background technique [0002] The fracturing process is an important technology for increasing production, increasing injection and maintaining stable production of oil fields. The existing fracturing methods generally adopt three stages for fracturing: pre-fluid stage, sand-carrying fluid stage, and displacement stage. In the pre-fluid stage, the performance of the liquid to transmit pressure is used, and a high-pressure pump group is used on the ground to pump a liquid with a certain viscosity into the well with a displacement greater than the absorption capacity of the formation, and a high pressure is generated at the bottom of the well. This pressure exceeds the in-situ stress of the oil layer and The tensile strength of the rock is to generate cracks in the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/267
Inventor 冯兴武范喜群孙彬峰邢德钢刘洪涛王树森杨琪
Owner CHINA PETROLEUM & CHEM CORP
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