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A carbon dioxide and foam system technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor foaming effect and nano-particle precipitation
Active Publication Date: 2021-09-28
PETROCHINA CO LTD
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Problems solved by technology
The composite foam system is composed of anionic surfactants and hydrophobically modified silica nanoparticles. Although the composite system improves the foam stability under indoor conditions, it is not effective under high-salt reservoir conditions, especially Ca 2+ , Mg 2+ Under the condition of high content, both anionic surfactant and nano-particles will precipitate, resulting in poor underground foaming effect
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Embodiment 1
[0034] The present embodiment provides a foaming liquid for a supercritical carbon dioxide foam system, wherein the foaming liquid includes 0.1 g of tetradecyl dimethyl betaine, 0.01 g of hydrophilic silica sol (the hydrophilic The active ingredientmass fraction of the silica sol is 30%, and the particle diameter of the silica particles in the hydrophilic silica sol is 5-30 μm) and brine; wherein the brine includes 1.8g of NaCl, 0.2g of CaCl 2 The mass is, 100mL of water.
[0035] The foaming liquid for the above-mentioned supercritical carbon dioxide foam system is prepared by the following preparation method:
[0036] NaC, CaCl 2 It is mixed with water to prepare brine, and then tetradecyl dimethyl betaine and hydrophilic silica sol are added to the brine, and magnetically stirred for 10-15 minutes to obtain the foaming liquid for the supercritical carbon dioxide foam system.
[0037] This embodiment also provides a supercritical carbon dioxide foam system, wherein the syst...
Embodiment 2
[0045] This embodiment provides a foaming liquid for a supercritical carbon dioxide foam system, which differs from Example 1 only in that the quality of NaCl in the brine of the foaming liquid is 4.5 g, CaCl 2 Quality is 0.5g, and others are all identical with embodiment 1.
[0046] This embodiment also provides a supercritical carbon dioxide foam system, which differs from that of Embodiment 1 only in that the foaming liquid provided in this embodiment is used as the foaming liquid.
[0047] The foaming volume and half-life measured in this embodiment are shown in Table 1.
Embodiment 3
[0049] This embodiment provides a foaming liquid for a supercritical carbon dioxide foam system, which differs from Example 1 only in that the quality of NaCl in the brine of the foaming liquid is 9g, CaCl 2 Quality is 1g, and others are all identical with embodiment 1.
[0050] This embodiment also provides a supercritical carbon dioxide foam system, which differs from that of Embodiment 1 only in that the foaming liquid provided in this embodiment is used as the foaming liquid.
[0051] The foaming volume and half-life measured in this embodiment are shown in Table 1.
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Abstract
The invention provides a supercritical carbon dioxide foam system, a preparation method thereof and foaming liquid. The foaming liquid for the supercritical carbon dioxide foam system comprises, in percentage by mass, 0.01-1 wt% of a foaming agent, 0.1-3 wt% of a foam stabilizer and the balance saline water, wherein the foaming agent is an ampholytic surfactant, and the foam stabilizer is hydrophilic silica sol. The supercritical carbon dioxide foam system comprises supercritical carbon dioxide and the foaming liquid. The foaming liquid can well form a supercritical carbon dioxide foam system under the action of supercritical carbon dioxide, and the formed supercritical carbon dioxide foam system is good in salt resistance and foamability, and can generate abundant foams under harsh oil reservoir conditions.
Description
technical field [0001] The invention belongs to the technical field of oil and gas field development and production, and particularly relates to a supercritical carbon dioxide foam system suitable for high salinity oil reservoirs, a preparation method thereof and a foaming liquid for the supercritical carbon dioxide foam system. Background technique [0002] In China, high-temperature, high-salt and low-permeability reservoirs are gradually being developed as the production increase potential of mature oilfields continues to decrease. Under reservoir conditions, supercritical carbon dioxide has high-efficiency oil displacement effects such as viscosity reduction, expansion energy increase, and interfacial tension reduction, and has gradually become an important technical means for the development of low-permeability reservoirs. and CO 2 Oil displacement also becomes CCUS (CO 2 An integral part of capture, utilization and storage) technologies that enable CO 2 bury. [00...
Claims
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Application Information
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