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Foam fracturing fluid sand proportion concentrator for oil gas well and application thereof

A foam fracturing fluid and concentrator technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve problems such as difficulty in producing high sand ratio, and achieve the effects of high efficiency, strong safety and simple operation

Inactive Publication Date: 2015-07-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, when the foam quality is high, the sand ratio decreases more obviously in the sand-carrying foaming fluid. This phenomenon will make it difficult to produce foam fracturing fluid with high sand ratio during construction.

Method used

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  • Foam fracturing fluid sand proportion concentrator for oil gas well and application thereof
  • Foam fracturing fluid sand proportion concentrator for oil gas well and application thereof
  • Foam fracturing fluid sand proportion concentrator for oil gas well and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A foam fracturing fluid-sand ratio concentrator for oil and gas wells, comprising an outer pipe 8, a rotating inner pipe 7 arranged axially of the outer pipe 8, and an annular inner pipe 7 is formed between the outer pipe 8 and the rotating inner pipe 7. cavity, a sealed partition 11 is arranged in the annular cavity, and the annular cavity is divided into a first annular cavity 19 and a second annular cavity 20; The pipe 8 is respectively provided with a sand-carrying foaming liquid injection pipe 6 and a concentrated liquid discharge pipe 10; a liquid inlet slit 9 is provided through the rotating inner pipe corresponding to the first annular inner cavity 19; The outer tube 8 corresponding to the annular inner cavity 20 is provided with a flow control valve 13 and the liquid phase discharge pipe 14 respectively;

[0031] Both ends of the outer tube 8 are provided with a motor 1 and a bearing 18 for the axial rotation of the rotating inner tube 7, and one end of the rot...

Embodiment 2

[0039] As described in Example 1, a foam fracturing fluid-sand ratio concentrator for oil and gas wells, the difference is that the sand-carrying foaming fluid injection pipe 6 is provided on the side of the outer pipe 8 away from the sealing partition 11, and A concentrated liquid discharge pipe 14 is provided on the other side of the outer pipe near the sealed partition 11 .

Embodiment 3

[0041] Taking a coalbed methane vertical well on site as an example, the formation depth to be fractured is 815-923 m, the production layer is 8 m thick, the average temperature of the production layer is 35°C, and the average permeability of the production layer is ≤0.1×10 -3 μm 2 , the well is a newly drilled vertical well with basically no production capacity. The foam fracturing process is adopted. Since the formation is fragile, in order to avoid the high-pressure filling phenomenon of the formation near the wellbore during the fracturing process, the fracturing fluid is constructed with a small displacement. The fracturing fluid concentrator of the present invention is added to the layer to reduce the displacement of the sand-carrying fluid and increase the specific concentration of sand, that is, a foam fracturing fluid concentrator for oil and gas wells as described in Example 1 or 2. The application method includes the following steps:

[0042] (1) Connection equipme...

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Abstract

The invention discloses a foam fracturing fluid sand proportion concentrator for an oil gas well. The foam fracturing fluid sand proportion concentrator for the oil gas well comprises an outer pipe and a rotating inner pipe arranged in the axial direction of the outer pipe, wherein an annular cavity is formed between the outer pipe and the rotating inner pipe, a seal partition is arranged in the annular cavity and divides the inner cavity into a first annular cavity body and a second annular cavity body; a sand-carrying foaming liquid injection pipe and a concentrated liquid discharging pipe are arranged on the part, corresponding to the first annular cavity body, of the outer pipe respectively; liquid inlet seams are formed in the part, corresponding to the first annular cavity body, of the rotating inner pipe in a cut-through mode; a flow control valve and a liquid phase discharging pipe are arranged on the part, corresponding to the second annular inner cavity body, of the outer pipe; liquid outlet seams are formed in the part, corresponding to the second annular inner cavity body, of the rotating pipe in a cut-through mode. The foam fracturing fluid sand proportion concentrator for the oil gas well has the advantages that the sand proportion of sand-carrying foaming liquid is controlled to be higher, and therefore the sand portion of foaming fracturing fluid is improved, the pressure resistance, the wear resistance and the corrosion resistance are achieved, and the foam fracturing fluid sand proportion concentrator for the oil gas well is applicable to oil gas well fracturing construction use.

Description

technical field [0001] The invention relates to a foam fracturing fluid-sand ratio concentrator for oil and gas wells and an application thereof, which belongs to the technical field of oil and gas field fracturing transformation. Background technique [0002] With the increasing demand for oil and natural gas energy, more and more unconventional low-permeability oil and gas reservoirs have been developed and utilized. The most effective way to develop these unconventional oil and gas reservoirs is to perform fracturing to increase oil and gas production capacity. Compared with conventional fracturing technology, foam fracturing technology has the advantages of large sand carrying capacity, low filtration loss, high fracturing efficiency, high flowback volume, and less formation damage. It is an effective way to develop unconventional low-permeability oil and gas reservoirs . [0003] At present, most of the foam fracturing construction process adopts the technical process ...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/267
Inventor 李宾飞李兆敏吕其超张昀李爱山李松岩
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)