Paraffin rosin water plugging agent for water plugging of thick oil huff-puff well and water plugging construction method
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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
Active Publication Date: 2013-07-31
PETROCHINA CO LTD
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[0006] The main purpose of the present invention is to provide a water plugging construction method suitable for heavy oil huff and puff wells, to avoid and solve the problem of cold damage caused by traditional water plugging methods to heavy oil production wells
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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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Abstract
The invention provides a paraffin rosin water plugging agent for water plugging of a thick oil huff-puff well and a water plugging construction method. The water plugging agent for the water plugging of the thick oil huff-puff well is mixed liquid prepared by paraffin, rosin and water. The water plugging construction method of the thick oil huff-puff well comprises the steps that the paraffin-rosin mixed liquid water plugging agent provided by the invention is filled into a stratum to be treated for selective water plugging, and in addition, the temperature of the water plugging agent in the filling process is ensured to be higher than the freezing point temperature of the paraffin and the softening point temperature of the rosin. The technology provided by the invention is utilized, because the construction temperature during the water plugging agent filling is higher than the freezing point temperature of the paraffin and the softening point temperature of the rosin, water and solidcontent objects such as the paraffin, the rosin and the like form liquid-liquid mixed phases, and the liquid-liquid mixed phases can easily enter the deep part of the stratum; after the mixed phases are squeezed into the stratum, the paraffin and the rosin are crystallized and separated out along with the heat exchange when the temperature is lower than 55 DEG C, and the paraffin and the rosin are dissolved after meeting oil and are unchanged after meeting water, so the selective water plugging is realized; and simultaneously, the cold damage problem can be effectively avoided.
Description
technical field [0001] The invention belongs to the technical field of water plugging in heavy oil wells, in particular to a water plugging agent prepared by adding water to paraffin and rosin for heavy oil huff and puff wells and a water plugging construction method using the water plugging agent. Background technique [0002] At present, in the petroleum industry, chemical water plugging has poor selectivity, low water plugging success rate, and few selective water plugging methods. In order to stabilize oil and water and increase crude oil production, the invention team of Liaohe Oilfield Company developed the paraffin emulsion water blocking technology. [0003] Paraffin emulsion water plugging technology is a selective water plugging technology, mainly by modifying paraffin wax, adding emulsifier to disperse it into an oil-in-water emulsion, using conventional construction methods, and modifying it under normal temperature conditions. After the paraffin emulsion is squ...
Claims
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