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Method for preventing or stopping polymer aggregation on oil well corresponding to polymer flooding and used treating agent

A technology for polymers and oil wells, which is applied in the field of preventing or preventing polychanneling in oil wells corresponding to polymer flooding, and can solve the problems of not providing selective channeling blocking polymers, so as to increase the swept volume and save treatment Cost, EOR effect

Active Publication Date: 2015-04-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above prior art has illustrated the necessity and difficulty of controlling polymer channeling (poly channeling), none of them provide selective sealing and early prevention of channeling in polymer flooding corresponding oil wells (effective wells or production wells). or ways to prevent polymers from entering the corresponding wells prematurely

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A polymer flooding corresponds to the production well, the production well section is 1382.20-1404.70 meters, the thickness is 14.1 meters / 4 layers, the average permeability is 522 mD, the shale content is 11%, and the effective porosity is 24%. The daily output of liquid is 16 cubic meters, the daily oil output is 3.2 tons, and the water content is 80%. In August 2013, it was detected that the output liquid contained 20.2ppm of polymer, and it was decided to implement an early prevention of poly-channeling treatment process.

[0033] The early prevention poly-channeling treatment construction steps of the present embodiment include:

[0034] 1, the preparation of coagulation flocculation treatment agent: polyaluminum ferric sulfate (industrial grade) 10%, crude oil demulsifier polyether L64 (industrial grade) 10%, ammonium chloride (industrial grade) 1%, all the other are pure water, will The above raw materials are mixed and compounded to obtain the finished coagulati...

Embodiment 2

[0042] A polymer flooding corresponds to the production well, the production well section is 1388.00-1402.60 meters, the thickness is 23.7 meters / 7 layers, the average permeability is 735 mD, the shale content is 5%, and the effective porosity is 26.10%. The daily output of liquid is 37 cubic meters, the daily output of oil is 2.9 tons, and the water content is 92%. In November 2013, it was detected that the output liquid contained 309.7ppm of polymer, and it was decided to implement a deep-seated anti-coalescence treatment process.

[0043] The deep part of the present embodiment prevents poly-channeling and the construction steps include:

[0044] 1. Preparation of coagulation and flocculation treatment agent: 20% of diesel oil, 1% of sodium dodecylbenzenesulfonate, 20% of zinc chloride, and 59% of hydrochloric acid (industrial grade 10%) for the rest. Add sodium dodecylbenzenesulfonate into the diesel oil and keep it in a fully stirred state, dissolve zinc chloride in hydro...

Embodiment 3

[0052] A polymer flooding corresponds to the production well, the production well section is 1426.80-1448.60 meters, the thickness is 10.4 meters / 5 layers, the average permeability is 71.8 mD, the shale content is 33%, and the effective porosity is 23.70%. The daily fluid production is 83.2 cubic meters, the daily oil production is 3.3 tons, and the water content is 96%. In September 2013, it was detected that the output fluid contained 1136.8ppm of polymers. The well has formed a dominant channel for poly-channeling, and decided to adopt a high-strength anti-poly-channeling treatment process.

[0053] The high-strength prevention poly-channeling treatment construction steps of the present embodiment include:

[0054] 1. Preparation of coagulation and flocculation treatment agent: 20% of diesel oil, 1% of sodium dodecylbenzenesulfonate, 20% of polyaluminum iron silicate, and 59% of hydrochloric acid (industrial grade 10%). Add sodium dodecylbenzene sulfonate into diesel oil an...

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Abstract

The invention relates to a method for preventing or stopping polymer aggregation on an oil well corresponding to polymer flooding and a used treating agent. The method comprises the following steps: coagulation flocculation treating fluid is extruded into a stratum from an oil layer annulus according to the doage of 5-25 m3 on every meter of the oil layer, wherein the extruding speed adopts a mode of slowly first and then faster, and is controlled within 5-20 m3 / h; the coagulation flocculation treating fluid is treating fluid containing a coagulant agent and / or a flocculating agent; the contents of the coagulant agent and the flocculating agent in the coagulation flocculation treating fluid are 5-30%; the coagulation flocculation treating fluid is ejected into the deep part of the stratum by displacement fluid; the speed is controlled within 8-20 m3 / h, and also uses the principle of slowly first and then faster; the well is closed for 8-16 hours; and then the well is opened for producing. The method can effectively prevent or stop the polymer aggregation on the oil well corresponding to the polymer flooding, and is strong in pertinency and high in success rate.

Description

technical field [0001] The invention relates to a method for preventing or preventing poly-channeling, and more specifically relates to a method for preventing or preventing poly-channeling on an oil well corresponding to polymer flooding, and belongs to the technical field of oil field development and enhanced recovery. Background technique [0002] Most oilfields in China are developed by early water injection. At present, all the main oilfields have entered the high water cut period, and the water cut is rising rapidly. The water cut is high. It is urgent to develop new oil development technology and improve the recovery rate of old oilfields. Among them, the chemical polymer flooding technology is one of the most widely used tertiary oil recovery technologies in my country, and has entered the stage of large-scale promotion and application from pilot tests. At present, Daqing, Dagang, Henan, Shengli, and Liaohe Oilfields have all carried out polymer flooding field applic...

Claims

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Application Information

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IPC IPC(8): E21B33/13C09K8/42
CPCC09K8/5045C09K8/5086E21B33/13
Inventor 高玉军马春宝王德伟张玉增段效威孙红霞张艳斌
Owner PETROCHINA CO LTD
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