Fracturing design method for optimizing uniform spreading concentration

A design method and laying technology, applied in earthwork drilling, production fluid, wellbore/well components, etc., can solve the problem that the pump injection program does not meet the objective requirements of oilfield production

Active Publication Date: 2012-07-11
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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Problems solved by technology

Practice has proved that the pumping procedure is less and less

Method used

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  • Fracturing design method for optimizing uniform spreading concentration
  • Fracturing design method for optimizing uniform spreading concentration
  • Fracturing design method for optimizing uniform spreading concentration

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Embodiment Construction

[0021] A fracturing design method for optimizing the uniform laying concentration, taking the injection of cross-linked guar gum liquid as an example, is implemented according to the following four steps.

[0022] Such as figure 1 As shown, in step one, the liquid efficiency η is determined by the small-scale test fracturing of cross-linked guar gum, and the cross-linked guar gum liquid efficiency η is 24.5%, which belongs to low liquid efficiency. .

[0023] Step 2, according to the glue liquid efficiency η that obtains in step 1 is 24.5%, η is brought in formula one and formula two,

[0024] …………………………………… (Formula 1)

[0025]

[0026] ………………………………… (Formula 2)

[0027] Calculated prefluid volume ν is 85m 3 , the test fracture interpretation permeability is 1.1×10 -3 μm 2 .

[0028] Such as figure 2 Shown, step 3, in conjunction with step 1, cross-linked guar gum liquid efficiency η is 24.5% and step 2, and in step 2, ...

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Abstract

The invention relates to a method for oil extraction in oilfields, namely a method for optimizing a conventional fracturing sand adding program in underground operation, in particular to a fracturing design method for optimizing uniform spreading concentration. The method is implemented by adding leading liquid and then uninterruptedly adding sand mixed liquid. The method is characterized by comprising the following four steps: 1, determining the efficiency eta of the liquid; 2, determining the volume nu of the leading liquid; 3, determining the sand adding gradient; and 4, performing a uniform spreading concentration pumping program, adding the leading liquid of which the volume nu is determined in the step 2, and then uninterruptedly adding the sand mixed liquid according to the sand adding gradient designed in the 3. By the method, the conventional simple pumping method based on the construction experience is changed; and by adopting the uniform spreading concentration sand adding program of different sand-liquid ratio raising speeds at different stages, the effectiveness of fracturing design and the transformation degree of a reservoir are improved on the premise that the pumping safety is ensured.

Description

technical field [0001] The invention relates to a process method for oil recovery in an oil field, which is a method for optimizing conventional fracturing and sanding procedures in downhole operations, in particular a fracturing design method for optimizing uniform laying concentration. Background technique [0002] Hydraulic fracturing is a measure to increase production and injection of oil, gas and water wells. However, until today, the fracturing design of various oilfields still adopts the conventional "empirical" pumping procedure regardless of the formation conditions, that is, each well is injected with sand mixing concentration in the early stage. The sand mixing concentration is different in the middle stage of pump injection, but the sand concentration in the later stage tends to be the same for pump injection and sand addition. The important parameters to evaluate whether the fracturing process is in place are the fracture half-length and the conductivity. Throu...

Claims

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Application Information

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IPC IPC(8): E21B43/267
Inventor 池晓明张冕刘欢杨燕宋孝丹郭艳萍袁冬蕊高红平侯东红
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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