Method for calculating critical flowback velocity of fracturing fluid

A technology of speed calculation and speed calculation formula, which is applied in calculation, earthwork drilling, mining fluid, etc., can solve problems such as fracture sand spit, and achieve the effect of solving formation sand spit

Active Publication Date: 2018-12-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, its basis is mainly on-site experience, so sand spit out from fractures often occurs, leading to major downhole accidents such as sand buried pipe strings and sand stuck packers

Method used

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  • Method for calculating critical flowback velocity of fracturing fluid
  • Method for calculating critical flowback velocity of fracturing fluid
  • Method for calculating critical flowback velocity of fracturing fluid

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Embodiment Construction

[0037] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0038] Such as figure 1 as shown, figure 1 It is a flow chart of the method for calculating critical flowback velocity of fracturing fluid in the present invention.

[0039] Step 101, proppant settlement experiment. The settling velocity experiment of proppant in gel-breaking fluid to determine the settling velocity of proppant.

[0040] The movement of the proppant in the fracture is free-settling in the vertical direction, and moves in the horizontal direction due to the stagnation effect of the fracturing fluid, so it can be regarded as the synthesis of the subsidence and the stagnation of the fracturing fluid. Regardless of the influence of sand concentration and fracture wall, the velocity of a single proppant in the horizontal direction should...

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Abstract

The invention provides a method for calculating critical flowback velocity of fracturing fluid. The method includes the following steps: step 1, performing a settling velocity experiment of a proppingagent to determine the settling velocity of the propping agent; step 2, simplifying a settling model of the propping agent in a crack; step 3, simplifying a settling model of the propping agent in ahole; and step 4, deducing a critical flowback velocity calculation formula. The method eliminates the impact of uncertainties in current field experience on flowback velocity, determines the criticalvalue of the flowback velocity, and solves problems of sand spouting in stratums caused by the over quick flowback velocity.

Description

technical field [0001] The invention relates to the field of oilfield exploitation, in particular to a method for calculating critical flowback velocity of fracturing fluid. Background technique [0002] As an effective means of exploiting low-permeability oil and gas reservoirs, fracturing is more and more widely used. There are currently two main methods of fracturing fluid flowback after fracturing: [0003] The first is rapid flowback: In order to reduce the pollution of fracturing fluid to the formation, after fracturing, measures should be taken to force flowback immediately. But the disadvantages are very obvious. It often happens that the fracturing fluid carries the proppant back out without completely breaking the gel, resulting in blockage of the oil nozzle. [0004] The second is to control the flowback according to the pressure: after the fracturing fluid breaks, replace the oil nozzles of different sizes according to the pressure to control the flowback of th...

Claims

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Application Information

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IPC IPC(8): G06F17/50E21B43/267G06Q50/02
CPCE21B43/267G06Q50/02
Inventor 陈培胜陈勇钟安海王瑞军郁登朗吕永利丁然张军峰王昊卢娜娜
Owner CHINA PETROLEUM & CHEM CORP
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