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Fracturing method for supplementing stratum energy of dense oil reservoir

A technology for tight oil and fracturing, which is used in earth-moving drilling, special data processing applications, and production of fluids. The effect of replenishing formation energy

Inactive Publication Date: 2015-12-09
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are a series of problems in the development of tight oil reservoirs, such as high cost, shortage of gas source, and serious gas channeling, which limit the wide application of this technology in oil fields.

Method used

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  • Fracturing method for supplementing stratum energy of dense oil reservoir
  • Fracturing method for supplementing stratum energy of dense oil reservoir
  • Fracturing method for supplementing stratum energy of dense oil reservoir

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Embodiment 1

[0049] This embodiment provides a fracturing method for supplementing formation energy of tight oil reservoirs, the method comprising the following steps:

[0050] Step 1: Combining the characteristics of tight oil reservoirs, considering the characteristics of non-Darcy flow with threshold pressure gradient, use CMG reservoir numerical simulation software to simulate the range and volume of a single fracture that can be released under subdivided cutting or complex fracture conditions The schematic diagram of the complex fracture network formed by transformation is as follows: figure 1 shown;

[0051] Step 2: Optimizing the spacing between horizontal wells and clusters for volume fracturing in tight oil reservoirs by using the theory of mechanical interference between fractures, and optimizing the cluster length and perforation parameters of perforation in combination with the principle of flow-limited fracturing;

[0052] Step 3: On the basis of the above optimization result...

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Abstract

The invention provides a fracturing method for supplementing stratum energy of dense oil reservoir. The method includes the steps that in combination with characteristics of the dense oil reservoir, characteristics of non-darcy seepage are considered, and CMG oil reservoir value simulation software is utilized to simulate and calculate a discharge area controlled by a single fracture under the modes of subdivision cutting and a complex fracture net with the starting pressure gradient considered; in combination with a fracture spacing chemical interference theory, the horizontal well improvement segment spacing improved by dense oil reservoir size fracturing, cluster spacing and perforating parameters are optimized; the dense oil reservoir transformation parameter is determined through a non-darcy seepage equation and the CMG oil reservoir value simulation software; the ram material composition of fracturing liquid is determined according to the wettability and sensitivity of the reservoir; the fracturing liquid and a propping agent are poured, the flow velocity of the eyelet of a single liquid suction and injection hole of the fracturing liquid is 0.25 m<3> / min-0.4 m<3> / min, and the pouring intensity is 10 m<3> / min-15 m<3> / min; the well closing time is determined through the CMG oil reservoir value simulation software, a well is closed according to the determined well closing time, and the fracturing method integrates pressing, pouring, driving and exploiting.

Description

technical field [0001] The invention relates to a fracturing method for tight oil reservoirs, in particular to a fracturing method for supplementing formation energy of tight oil reservoirs, integrating water injection and oil displacement, and belongs to the technical field of petroleum exploitation. Background technique [0002] Unconventional oil and gas reservoirs such as shale gas and tight oil contain abundant oil and gas resources. The largest stimulated volume (SRV) and the largest contact area (Contact) between fractures and reservoirs in the stimulated volume can be obtained through staged fracturing of horizontal wells. Moderate conductivity (Conductivity) and how to maintain formation energy (Pressure) are the keys to realize the economical and effective development of such resources. [0003] It is difficult to replenish energy in tight oil reservoirs, and the recovery degree of natural energy depletion mining is generally less than 10%. At present, the develop...

Claims

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Application Information

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IPC IPC(8): E21B43/267G06F17/50
Inventor 吴奇邹才能丁云宏卢拥军才博王欣何春明段贵府
Owner PETROCHINA CO LTD
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