Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preventing polymer breakthrough at oil layer deep portion of polymer flooding corresponding oil well and treating agent used by method

A polymer and oil layer technology, applied in the field of preventing polychanneling, polymer flooding corresponding to the deep part of the oil well layer to prevent polychanneling, can solve the problem of not providing selective sealing channeling, etc., to achieve increased swept volume, good oil displacement effect, and success rate high effect

Active Publication Date: 2015-04-01
PETROCHINA CO LTD
View PDF7 Cites 0 Cited by
  • 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), there is no provision for selectively sealing channeling and preventing polymer flooding on the corresponding oil wells (effective wells or production wells) of polymer flooding. Ways to enter corresponding wells too early

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 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.

[0034] The deep part of the present embodiment prevents poly-channeling and the construction steps include:

[0035] 1. Preparation of coagulation and flocculation treatment agent: 20wt% of diesel oil, 1wt% of sodium dodecylbenzenesulfonate, 20wt% of zinc chloride, and 59wt% of hydrochloric acid (industrial grade 10%). Add sodium dodecylbenzenesulfonate into the diesel oil and keep it in a fully stirred state, dissolve zinc chloride in hydrochlor...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for preventing polymer breakthrough at oil layer deep portion of a polymer flooding corresponding oil well and a treating agent used by the method. The method comprises the steps of extruding a coagulation flocculation agent into a stratum according to the 5-25 m<3> using amount per meter of oil layer from an oil layer annulus, wherein the extruding speed is low firstly and high afterwards and is controlled to be 5-20 m<3> / h, a raw material of the coagulation flocculation agent consists of diesel oil 10-20%, sodium dodecyl benzene sulfonate 0.5%-1.5%, zinc chloride 10-30% and the balance hydrochloric acid 8-15%; using displacement fluid to displace the coagulation flocculation agent into the deep portion of the stratum and controlling the injection speed of the displacement fluid to be 8-20 m<3> / h; closing the well for 8-16 hours and opening the well for production. The method is targeted and high in success rate, effective ingredients can be effectively brought to the deep portion of the stratum, oil displacement sweep volume can be increased, the recovery efficiency can be improved, and output liquid treatment cost can be saved.

Description

technical field [0001] The invention relates to a method for preventing poly-channeling and a used treatment agent, more specifically to a method for preventing poly-channeling in the deep part of an oil layer corresponding to polymer flooding and a used treatment agent, belonging 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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E21B43/22C09K8/502
CPCC09K8/502E21B33/138E21B43/16
Inventor 高玉军曹广胜夏云棚苏野刘伟曹纪绒朱明远
Owner PETROCHINA CO LTD