Gasified reactive water-cleaning well squeeze-adding expand-proof agent test charging process
A technology of anti-swelling agent and active water, which is applied in wellbore/well parts, cleaning equipment, earthwork drilling and production, etc. It can solve problems such as polluted oil layers, increased water injection pressure, and water drive fingering
Inactive Publication Date: 2003-10-15
PETROCHINA CO LTD
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Problems solved by technology
[0002] At present, when the water injection well is put into production, it simply adopts the conventional well flushing method of flushing the wellbore with large-volume clean water or active water with non-ionic surfactants. , can not fully dissolve the oil and waxy components in the well, resulting in the inability to clean the well during the well flushing process, and pollute the oil layer during water injection production; for low-permeability and low-pressure oil layers, the high liquid column pressure in the wellbore will also cause dirty water to flow backward Entering and polluting the oil layer, causing water injection pressure to rise, water flooding fingering, affecting water injection effect; re-implementing plugging removal and increasing injection measures requires more investment and greater economic losses
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Embodiment 1
[0019] After implementing gasification active water flushing well plus extrusion anti-swelling agent trial injection process in Jing'an Oilfield, the average water injection pressure in the whole area is 6.6Mpa, and the qualified rate of injection has reached over 95% (far higher than the company's index of 80% and low permeability oilfields water injection development average), resulting in various operating parameters.
[0020] hashtag
Embodiment 2
[0022] For the comparison of the apparent water absorption indicator curves of wells Liu 41-50, 90-40, and 65-40, see figure 2 , it can be seen from the water absorption indicator curve comparison chart that the water absorption capacity of the three wells is significantly improved after the gasification water washing well, the oil layers reflect different degrees of strong water absorption characteristics, the water injection pressure decreases, and the injection allocation plan can be completed at a lower pressure.
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The technological process of washing water injection well and feeding antiswell agent in petroleum extraction includes: supplying compressed air to oil pipe by air compressor to increase pressure; injecting the mixture of active water and air with the cement truck or water injection station to clean stratum until reaching the same water quality in the water inlet and water outlet and further injecting water for some time until reaching zero casing pressure; and injecting water with the water injection station normally after antiswell agent is poured into the water injection well. The mixtureof active water and air with lower density can reduce leakage loss in oil reservoir; and the antiswell agent can reduce the jamming of pore throat caused by swelling clay and other mineral to raise oil displacing efficiency.
Description
technical field [0001] The invention is used in the production process of water injection wells in the development of low-permeability oil fields, specifically, it is a test injection process of gasification active water washing wells plus extrusion and anti-swelling agents. Background technique [0002] At present, when the water injection well is put into production, it simply adopts the conventional well flushing method of flushing the wellbore with large-volume clean water or active water with non-ionic surfactants. , can not fully dissolve the oil and waxy components in the well, resulting in the inability to clean the well during the well flushing process, and pollute the oil layer during water injection production; for low-permeability and low-pressure oil layers, the high liquid column pressure in the wellbore will also cause dirty water to flow backward Entering and polluting the oil layer, causing water injection pressure to rise, water flooding fingering, affectin...
Claims
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Inventor 石磊张兴华陈宏涛田启武董凤鸿
Owner PETROCHINA CO LTD