Water plugging method of unconventional oil and gas reservoir oil well
An oil and gas reservoir, unconventional technology, applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve the problems of less remaining oil, unreasonable technology, short effective time after plugging, etc.
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Embodiment 1
[0061] A well was opened three times, which is a horizontal well with a depth of 2434m, a horizontal open hole section of 520m, a reservoir temperature of 65°C, a salinity of injected water of 4550mg / L, Ca 2+ , Mg 2+ The content is 3043mg / L, the formation is micro-fractured, and drilling shows a small amount of leakage. After the fracturing in 2008, the initial daily oil production was 15t, and the water cut was 3.56%. In June 2012, the water cut rose from 30% to 70%. %, the analysis shows that fracturing man-made fractures communicate with natural fractures, and water injection opens and scours, causing the injected water to enter the oil well along the fractures.
[0062] Prepare 10,000 mg / L and 3,000 mg / L non-crosslinked gel aqueous solutions respectively, and mature them in a liquid storage tank for 4 hours before use. Under the conditions of simulating on-site liquid distribution, a horizontal well model is adopted, and four slug combinations are adopted indoors: (1) plu...
Embodiment 2
[0065] A well was opened for the third time, which belongs to the bottom water oil and gas reservoir, the well depth is 4354m, the reservoir temperature is 85℃, the injected water salinity is 12589mg / L, Ca 2+ , Mg 2+ Content 356mg / L, bottom water reservoir, put into production in 2004, initial daily oil production 28t, no water cut, annual growth rate of water cut 28.72% from 2014 to 2016, water cut 99% in September 2016, shut down 4 times from 2014 to 2016 The pressure cone is invalid, and the water plugging of conventional oil wells is effective for less than two months. The original formation pressure of this well is 48.2MPa, and the static pressure measured in 2016 is 45.6MPa. This leads to high water cut in this well.
[0066] Prepare 10,000 mg / L and 3,000 mg / L non-crosslinked gel aqueous solutions respectively, and mature them in a liquid storage tank for 4 hours before use. Under the conditions of simulating on-site liquid distribution, the bottom water model is adopt...
Embodiment 3
[0069] A well was opened for the second time, belonging to a low-permeability fractured oil and gas reservoir, the well depth is 2214m, the reservoir temperature is 65°C, the salinity of injected water is 9873mg / L, Ca 2+ , Mg 2+ Content 349mg / L, low permeability fractured reservoir, put into production in 2006, the initial daily oil production was 4.6t, no water cut, the annual growth rate of water cut was 6.72% from 2010 to 2014, and the water cut suddenly rose from 56% to 100% in September 2015. Chloride ions show that the incoming water of the well is injection water. Under the long-term water injection opening, the injected water rushes into the well along the micro-fractures, forming a dominant water flow channel, leading to violent flooding of the oil well.
[0070] Configure 5000mg / L, 800mg / L, and 8000mg / L non-crosslinked gel aqueous solutions respectively, add the shielding agent betaine, and the dosage is 0.8% of the quality of the non-crosslinked gel aqueous solution...
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