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Acid-carrying sand fracturing system and method

A fracturing and fracturing fluid technology, which is applied in earthwork drilling, wellbore/well components, measurement, etc., can solve the problem of inability to collect sound wave-acoustic emission signals simultaneously, fracture damage characteristics of fracturing specimens, and inability to pump acid base Fracturing fluid, different fracturing fluids cannot be pumped at the same time, etc.

Inactive Publication Date: 2018-12-18
CHONGQING UNIV +2
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  • Description
  • Claims
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Problems solved by technology

[0005] The invention provides an acid-carrying sand fracturing system and method, which is used to solve the problem that the indoor fracturing physical simulation test device in the prior art cannot pump corrosive acid-based fracturing fluids, and cannot pump different fracturing fluids at the same time It also realizes variable displacement control, and cannot simulate acid-carrying sand fracturing under different formation stress conditions, and cannot simultaneously collect acoustic wave-acoustic emission signals to analyze the fracture damage characteristics of fracturing specimens. It has achieved the ability to simulate different formation conditions. Acid-carrying sand fracturing and combined fracturing process, and real-time monitoring of physical properties, mechanical properties and acoustic signal changes in the fracturing process, to explore the technology of fracture initiation and extension law in the process of volumetric acid fracturing in carbonate rock reservoirs Effect

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  • Acid-carrying sand fracturing system and method

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Embodiment 1

[0029] figure 1 It is a schematic structural diagram of an acid-carrying sand fracturing system in an embodiment of the present invention. Such as figure 1 As shown, the system includes: a data acquisition unit 1, a rock three-axis servo loading unit 2, a fracturing fluid pump pressure servo control unit 3, a temperature control unit 4, and an acoustic wave-acoustic emission testing unit 5, specifically as follows:

[0030] A data collection unit 1, the data collection unit 1 collects the data information of the fracturing test piece 20;

[0031] Specifically, the data acquisition unit 1 is an information acquisition module of the system, and the data acquisition of the fracturing specimen 20 is realized through the data acquisition unit 1, and real-time monitoring is performed during the fracturing process. Relevant data information during the cracking process. The rock three-axis servo loading unit 2, the rock three-axis servo loading unit 2 applies axial pressure and lat...

Embodiment 2

[0052] image 3 It is a schematic flow chart of an acid-carrying sand fracturing method in an embodiment of the present invention, as image 3 As shown, the method includes:

[0053] Step 110: Drill a center hole in the center of the prepared fracturing test piece, and seal the center hole with stainless steel pipe and epoxy resin;

[0054] Specifically, cores such as carbonate rocks retrieved from the site are processed into Cylindrical fracture test piece and drilled in the center The cylindrical center hole 8, and choose The center hole is sealed with stainless steel pipe and epoxy resin to simulate the wellbore effect.

[0055] Step 120: Inject red tracer or fluorescent powder into the fracturing test piece 20, connect the two ends of the fracturing test piece to the first indenter 12 and the second indenter 13 respectively, and The first indenter 12 and one side of the second indenter 13 are provided with a first acoustic wave probe 14 and a second acoustic wave p...

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Abstract

The invention discloses an acid-carrying sand fracturing system and method, and belongs to the technical field of petroleum and natural gas engineering rock mechanics. The system includes a data acquisition unit, the data acquisition unit acquiring data information of a fracturing test piece; a rock three-axis servo loading unit, the rock three-axis servo loading unit applying axial pressure and lateral confining pressure to the fracturing test piece, and the rock three-axis servo loading unit being connected with the data acquisition unit; a fracturing fluid pumping servo control unit, the fracturing fluid pumping servo control unit controlling the displacement and pressure of the acid-carrying sand fracturing fluid entering the fracturing test piece; a temperature control unit; and an acoustic wave-acoustic emission test unit. The system and method of the invention achieve the technical effects that the acid-carrying sand fracturing process under different formation conditions can besimulated and the physical and mechanical properties and acoustic signal changes in the fracturing process can be monitored in real time, so as to explore crack initiation and extending law during the volume acid fracturing of carbonate reservoirs.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas engineering rock mechanics, in particular to an acid-carrying sand fracturing system and method. Background technique [0002] At present, the contradiction between international energy supply and demand is prominent, and energy security has increasingly become the focus of attention of all countries. The exploration and development of carbonate rock reservoirs has attracted the attention of the world, and it is the current key and hot field of oil and gas exploration and development. Carbonate reservoirs contain rich oil and gas resources, and their exploration and development potential is huge. Among the world's proven oil and gas reserves, 60% are marine carbonate reservoirs, so carbonate reservoirs Exploration and development potential is huge. However, the main method for stimulation of carbonate reservoirs is volumetric acid fracturing. [0003] However, in the process of...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21B43/267E21B49/00E21B47/14
CPCE21B43/26E21B43/267E21B47/14E21B49/00
Inventor 邓鹏曾义金杨春和徐峰郭印同王磊周俊陈杰
Owner CHONGQING UNIV
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