Paraffin rosin water plugging agent for water plugging of thick oil huff-puff well and water plugging construction method
A construction method and technology of water blocking agent, which are applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of heavy oil production well cold damage, etc. The effect of increasing oil output
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Embodiment 1
[0026] An oil well is constructed with conventional modified paraffin wax emulsion, and the water for the preparation of plugging agent is generally below 25 °C. After construction, the heavy oil well only drains water and does not produce oil at the initial stage. Generally, the effect of oil-increasing and precipitation will be seen after 10 days. The analysis shows that the heavy oil in the formation is condensed by condensation, causing cold damage, and it will be normal when the formation temperature is restored. In addition, under the low temperature state, the paraffin crystallizes too early, which is not conducive to entering the deep formation, resulting in a shortened validity period.
[0027] For this oil well, the water blocking agent and the water blocking construction technique of the present invention are adopted, and the specific operations are as follows:
[0028] Take the oil layer thickness of 20 meters as an example:
[0029] The preparation temperature is ...
specific Embodiment
[0030] Specific example: Jin 611-15-16 well. The well was put into production on 2003.05.12, 830.8-1028.5m, Yulou + Xinglongtai oil layer, 32.1m / 9 layers, average effective porosity 24.02, average formation permeability 0.9826μm 2 , formation crude oil viscosity 1526mPa.s, construction on May 22, 2009, preparation temperature is 80 ℃, effective paraffin content 20% + rosin content 5% selective water blocking agent 90 cubic meters, the temperature of the blocking agent is guaranteed by the boiler truck on site, The blocking agent is squeezed into the oil layer from the oil jacket annulus by the pump truck, and the displacement liquid is 20 cubic meters of hot sewage. The well was shut in for 3 days after construction. After the well was opened, the oil increased by 1016.8t and the precipitation was 6131.8m 3 , valid for 198d.
[0031] From 2009 to 2010, the present invention was tested for 16 well times, with an oil increase of 9775t, an average oil increase of 610.9t, and a...
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