Biological enzyme fracturing technology for oil fields and oil wells
A biological enzyme and fracturing technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve problems such as cold damage and water damage, and achieve the effects of strong compatibility, improved efficiency and high cost performance.
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Embodiment 1
[0036] A biological enzyme fracturing process for oil wells in oil fields, comprising the following steps:
[0037] The first step is to connect the ground pipeline and test the pressure of the high-pressure pipeline: the pressure reaches 50Mpa, no leakage,
[0038] In the second step, take 1.0m 3 / min displacement backwash well, cycle for more than two weeks,
[0039] The third step is to start pump fracturing and wait for the broken pressure display, and start filling after the pressure is stable. The filling sequence is:
[0040] First inject the pre-fluid, the pre-fluid is hot water solution of SUN-B2 bio-enzyme plugging remover with a mass concentration of 0.4%, the temperature is 70°C, and the amount of pre-fluid is 20m 3 ;
[0041] Then inject base liquid, add cross-linking agent and proppant while injecting base liquid, base liquid is by mass concentration 0.3% hydroxypropyl guar gum and mass concentration 0.4% SUN-B2 bio-enzyme unblocking agent solution according t...
Embodiment 2
[0047] A biological enzyme fracturing process for oil wells in oil fields, comprising the following steps:
[0048] The first step is to connect the ground pipeline and test the pressure of the high-pressure pipeline: the pressure reaches 50Mpa, no leakage,
[0049] In the second step, take 1.0m 3 / min displacement backwash well, cycle for more than two weeks,
[0050] The third step is to start pump fracturing and wait for the broken pressure display, and start filling after the pressure is stable. The filling sequence is:
[0051] First inject the pre-fluid, the pre-fluid is a hot water solution of SUN-B2 bio-enzyme unblocking agent with a mass concentration of 0.5%, the temperature is 80°C, and the pre-fluid dosage is 20m 3 ;
[0052] Then inject base liquid, add cross-linking agent and proppant while injecting base liquid, base liquid is by mass concentration 0.4% hydroxypropyl guar gum and mass concentration 0.5% SUN-B2 bio-enzyme unblocking agent solution according to...
Embodiment 3
[0058] A biological enzyme fracturing process for oil wells in oil fields, comprising the following steps:
[0059] The first step is to connect the ground pipeline and test the pressure of the high-pressure pipeline: the pressure reaches 50Mpa, no leakage,
[0060] In the second step, take 1.0m 3 / min displacement backwash well, cycle for more than two weeks,
[0061] The third step is to start pump fracturing until there is a broken pressure display, and start filling after the pressure is stable. The filling sequence is:
[0062]First inject the pre-fluid, the pre-fluid is hot water solution of SUN-B2 bio-enzyme unblocking agent with a mass concentration of 0.6%, the temperature is 90°C, and the pre-fluid dosage is 20m 3 ;
[0063] Then inject base liquid, add cross-linking agent and proppant while injecting base liquid, base liquid is by mass concentration 0.5% hydroxypropyl guar gum and mass concentration 0.6% SUN-B2 bio-enzyme unblocking agent solution according to ma...
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