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Paraffin rosin water plugging agent for water plugging of thick oil huff-puff well and water plugging construction method

A water blocking agent and heavy oil technology, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well parts, etc., can solve problems such as cold damage of heavy oil production wells, and achieve the purpose of prolonging the effective period of oil production, improving the effective period, The effect of increasing oil output

Active Publication Date: 2012-06-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A certain oil well was constructed with conventional modified paraffin wax emulsion, and the water used to prepare the plugging agent was generally below 25°C. The heavy oil well after construction only drained water at the initial stage and did not produce oil. Generally, the effect of increasing oil and reducing water would be seen after 10 days. The analysis shows that the heavy oil in the formation condenses when it is condensed, causing cold damage, and it will be normal when the temperature of the formation recovers. In addition, at low temperature, the paraffin wax crystallizes too early, which is not conducive to entering the deep formation, resulting in a shortened validity period.

[0027] For this oil well, adopt the water shutoff agent of the present invention and water shutoff construction technique, specific operation is as follows:

[0028] Take the oil layer thickness of 20 meters as an example:

[0029] Prepare 60 cubic meters of selective water blockin...

specific Embodiment

[0030] Specific examples: Jin 611-15-16 well. The well was put into production on May 12, 2003, 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 plugging agent is squeezed into the oil layer from the annulus of the oil sleeve by the pump truck, and the replacement liquid is 20 cubic meters of hot sewage. Shut down the well for 3 days after construction. After the well was opened, the oil increase was 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 increase of 9775 tons of oil, an average increase of 61...

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PUM

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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 shutoff for heavy oil wells, and in particular relates to a water shutoff agent prepared by adding water to paraffin wax and rosin for heavy oil huff and puff wells, and a water shutoff construction method using the water shutoff agent. Background technique [0002] At present, in the petroleum industry, the selectivity of chemical water shutoff is poor, the success rate of water shutoff is low, and there are few selective water shutoff methods. In order to stabilize oil and control water and increase crude oil production, the invention team of Liaohe Oilfield Company developed the paraffin emulsion water shutoff technology. [0003] The paraffin emulsion water shutoff technology is a selective water shutoff technology, mainly by modifying the paraffin and adding an emulsifier to disperse it into an oil-in-water emulsion. After the paraffin emulsion is squeezed into the formation, a certain amount ...

Claims

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Application Information

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IPC IPC(8): C09K8/42E21B33/13
Inventor 马春宝闫长生向延安吴洪举徐恩宽韩松高玉军张玉增刘广友詹美珍罗艳红姜晨华闻晶姜佳悦
Owner PETROCHINA CO LTD
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