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Proppant reflux control system and control method based on magnetic proppant

A backflow control and proppant technology, applied in the direction of fluid production, earthwork drilling, wellbore/well components, etc., to reduce the migration amplitude and alleviate the reduction of sand-laying concentration

Inactive Publication Date: 2013-08-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a proppant reflux control system and control method based on magnetic proppant; magnetic proppant particles coalesce to form a "bridge" structure in hydraulic fractures relying on mutual magnetic attraction , not only can effectively solve the problem of proppant backflow in the process of fracturing fluid flowback and prevent formation sand from entering the wellbore, but also prevent the problem of sand concentration reduction caused by proppant migration caused by fluid scouring

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  • Proppant reflux control system and control method based on magnetic proppant

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Embodiment 1

[0047] The magnetic proppant-based proppant reflux control method adopts the above-mentioned proppant reflux control system based on magnetic proppant, and starts the fracturing operation and proppant reflux control process after the construction site of the fracturing well is arranged. The specific steps are as follows:

[0048] Step 1: Layout the fracturing well site

[0049] According to the well conditions of the fracturing well and the designed fracturing construction plan, the fracturing tools are arranged in the wellbore of the fracturing well 4, and the downhole external magnetic field generator 3 is arranged near the fracturing interval; Fracturing equipment, surface current and voltage controller 7, and connect the surface current and voltage controller 7 with the underground external magnetic field generator 3 through the connection line 6 between the surface current and voltage controller and the underground external magnetic field generator, and check the surface c...

Embodiment 2

[0055] The difference between the working method of adjusting the state of proppant laying in artificial fractures and the method described in Example 1 during the fracturing fluid flowback process is:

[0056] In step 1: a set of magnetometers, such as superconducting quantum interferometers, is arranged on the ground of the fracturing well, and the laying state of the proppant in the fracture can be determined through the monitoring of magnetic anomalies;

[0057] Step 4: Constant fracturing fluid flowback speed, under the condition that the proppant will not flow back into the wellbore, the magnetic anomaly monitored by the surface magnetometer is used as the basis for judging the state of proppant laying, and the surface current and voltage controller 7 Change the applied electric field strength applied to the downhole external magnetic field generator 3 by gradually increasing, gradually decreasing, gradually increasing, gradually decreasing or alternately increasing and d...

Embodiment 3

[0059] The difference between the working method of adjusting the state of proppant laying in artificial fractures and the method described in Example 1 during the fracturing fluid flowback process is:

[0060] In step 1: a set of magnetometers, such as superconducting quantum interferometers, is arranged on the ground of the fracturing well, and the laying state of the proppant in the fracture can be determined through the monitoring of magnetic anomalies;

[0061] Step 4: Apply a constant external electric field to the downhole external magnetic field generator 3 through the surface current and voltage controller 7, and use the magnetic anomaly monitored by the surface magnetometer as the judgment of proppant laying under the condition that the proppant will not flow back into the wellbore. According to the setting state, the fracturing fluid flowback velocity is changed by gradually increasing, gradually decreasing, gradually increasing, gradually decreasing, or alternately ...

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Abstract

The invention relates to proppant reflux control system and control method based on a magnetic proppant. The proppant reflux control system based on the magnetic proppant comprises an underground applied magnetic field generator, a ground current and voltage controller, an underground applied magnetic field generator connecting circuit and a ground current and voltage controller. The proppant reflux control system is characterized in that the underground applied magnetic field generator is arranged beside a fractured interval in a fractured well barrel; and the underground applied magnetic field generator and the ground current and voltage controller are connected with the underground applied magnetic field generator connecting circuit through the ground current and voltage controller. A 'bridging' structure is formed by magnetic attraction between magnetic proppant granules. Thus, reflux of the proppant in a flowback process of fracturing fluid is effectively prevented; formation sand can be further prevented from entering the well barrel after the fractured well is put into production; the fluid drag force of the fracturing fluid in the flowback process can be relieved; and the migration amplitude of the proppant in a slit is also reduced. Thus, reduction of sanding concentration is relieved.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration and development, and in particular relates to a proppant backflow control system and control method, in particular to a proppant backflow control system and control method based on magnetic proppant. Background technique [0002] Fracturing technology is a commonly used reservoir stimulation measure in the oil and gas industry, and plays a very important role in the process of oil and gas exploitation. One of the keys to the success of fracturing technology is the performance and distribution of fracturing proppant. After the fracturing operation is completed, proppant backflow often occurs during the normal production process of oil and gas wells after fluid drainage and fracturing, and the backflow of proppant sometimes reaches more than 20% of the total proppant. [0003] Proppant flowback can affect the normal production of a fractured well. On the one hand, if the backflowing proppant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
Inventor 姚军刘均荣孙致学于伟强卜亚辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)