Targeted acidification fracturing physical simulation method for pore-type carbonate rock and application
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A carbonate rock and physical simulation technology, applied in the field of oil and gas exploration, can solve problems such as unfavorable simulation tests, difficulties in sampling underground cavernous carbonate rocks, and inability to ensure structural integrity
Active Publication Date: 2018-11-23
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI +1
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However, it is difficult to sample underground vug-type carbonate rocks with natural pores and fractures, and it is impossible to guarantee the integrity of its...
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Embodiment 1
[0043] The embodiment of this application provides a physical simulation method for targeted acid fracturing of vug-type carbonate rocks, such as figure 1 shown, including the following steps:
[0044] Step S110: collecting fresh outcrop samples corresponding to deep vug carbonate reservoirs, and processing them into cube samples;
[0045] Specifically, the cube sample is processed to ensure that three sets of ground stress parameters in different directions can be effectively applied when true triaxial loading is performed.
[0046] Step S120: prefabricating artificially drilled holes with a certain depth on the end face of the cube sample;
[0047] Specifically, a professional rock cutting machine is used to manually drill holes on one end face of the cube sample, or two or more end faces. The depth of artificial drilling is 45-55mm, and the number of artificial drilling is one or more than one. The shape of the end face of the drill hole can be round, square, polygonal, ...
Embodiment 2
[0067] This embodiment applies the physical simulation method for targeted acid fracturing of vug-type carbonate rocks provided in Embodiment 1, specifically including:
[0068] S201: Collect fresh outcrop samples corresponding to vug-type carbonate reservoirs, use a large stone cutting machine with a cutter head diameter of 1m to process the samples into 300mm×300mm×300mm cube samples, and ensure the parallelism of each end surface and integrity;
[0069] S202: if figure 2 As shown, a professional rock cutting machine is used to prefabricate an artificial cylindrical drill hole with a diameter of 5mm and a depth of 50mm on one end of the cube sample, and ensure the smoothness of the drill hole and the integrity of the sample;
[0070] S203: Use pre-configured hydrochloric acid with a volume concentration of 10%, inhale it through a disposable syringe, and slowly inject 50ml into the borehole at room temperature until it reaches the deep part of the artificially drilled carb...
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Abstract
The invention discloses a targeted acidification fracturing physical simulation method for pore-type carbonate rock and application, and belongs to the technical field of oil and gas exploration. Themethod comprises the steps that a fresh outcrop sample corresponding to a deep pore-type carbonate rock reservoir is collected and processed into a cubic sample; a manually-drilled pore is prefabricated in the end face of the cubic sample; acid liquid is injected into the artificially-drilled pore, and an acidized pore is formed after a reaction; a simulated wellbore is manufactured, and a simulated jetting pore is drilled in the wellbore; after the simulated wellbore is prefilled, a simulated casing pipe is put into the simulated wellbore, and annulus sealing fixation is conducted; fracturingfluid is pumped by a true triaxial model test machine to simulate acidification fracturing; after the reaction is fully conducted, curable glue is injected and fully infiltrated; after the sample istaken out and dried, the carbonate rock is removed, and a targeted acidification fracturing three-dimensional shape formed by the curable glue is obtained. By means of the method, the indoor simulation of natural carbonate rock pores is achieved, the targeted acidification fracturing physical simulation method is established to achieve directional cracking of artificial cracks, and the method canbe used for evaluating the targeted acidification fracturing effect.
Description
technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a physical simulation method and application of targeted acid fracturing of vug-type carbonate rocks. Background technique [0002] With the continuous progress of oil and gas exploration worldwide, large carbonate oil and gas fields have gradually become an important new field for the development of oil and gas resources, and new discoveries and breakthroughs have been made continuously, playing a pivotal role in the process of oil exploration and development. From a global perspective, carbonate reservoirs have become important oil and gas producing layers due to their wide distribution, uniform and stable thickness, and good physical properties. According to incomplete statistics, by the end of 2016, a total of 1021 large oil and gas fields had been discovered in the world. Among them, there are 321 large carbonate oil and gas fields. From the perspective of r...
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IPC IPC(8): E21B49/00E21B43/27
CPCE21B43/26E21B49/00
Inventor 郭印同周小贵姚奕明杨春和曾义金邓鹏常鑫
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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