A method for profile control and sealing channeling of ultra-heavy oil reservoirs

An oil-oil, super-viscous technology, used in earth-moving drilling, sealing/packaging, and fluid production, etc., can solve the problems of sand production, reduced steam heat utilization rate, inter-well steam channeling interference, etc., and achieves simple construction and operation. The measures have a long validity period and good anti-channeling effect.

Active Publication Date: 2018-04-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ultra-heavy oil reservoirs (such as Shuguang Oilfield) encounter bottlenecks in the development process due to a series of problems such as uneven production and interwell steam channeling interference. Especially in recent years, with the increase of , the formation deficit is serious, the channel of steam channeling gradually expands, causing the impact of steam channeling to intensify, once steam channeling occurs in the oil well, it will not only lead to the energy overflow of the steam injection well, reduce the steam heat utilization rate, and the production effect will become worse round by round, but also will make the channeling well Well temperature, pressure, and water content rise sharply, causing sand production, casing damage or even scrapping, and blowout accidents may occur in severe cases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example provides a method for regulating plugging and channeling of super heavy oil reservoirs, which takes Well Du 813-40-67 in Shuguang Oilfield as the research object, and performs profile control and channeling sealing on it. The operation steps are as follows:

[0039] 1) The first slug: inject the chemical system into the formation, fill and compact the steam channel, when injecting, control the construction pressure to 13MPa, and the injection volume to 1100m 3 ;in,

[0040] In terms of weight percentage, the raw material composition of the drug system includes 0.5% HPAM, 0.15% formaldehyde, 0.015% oxalic acid, 0.03% NH 4 Cl, 0.02% resorcinol, 7% solid phase particles, and the balance is water; the performance indicators of the organogel in the drug system are: temperature resistance is 180-200°C, gelation time is 8-20h, The gel strength is 1.5×10 5 -2×10 5 mPa·s, the plugging efficiency is above 98%;

[0041] In terms of weight percentage, the compositi...

Embodiment 2

[0047] This example provides a method for regulating plugging and channeling of super-heavy oil reservoirs. It takes Well Du 84-63-39 in Shuguang Oilfield as the research object, and performs profile control and channeling sealing on it. The operation steps are as follows:

[0048] 1) The first slug: inject the chemical system into the formation, fill and compact the steam channel, when injecting, control the construction pressure to 15MPa, and the injection volume to 1200m 3 ;in,

[0049] In terms of the weight percentage of the drug system, the raw material composition of the drug system includes 0.6% HPAM, 0.15% formaldehyde, 0.02% oxalic acid, 0.03% NH 4 Cl, 0.02% resorcinol, 8% solid phase particles, and water as the balance; the performance indicators of the organogel in the pharmaceutical system are: temperature resistance is 180-200°C, gelation time is 8-20h, gelation time is 8-20h, Glue strength is 1.5×10 5 -2×10 5 mPa·s, the plugging efficiency is above 98%;

[0...

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PUM

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Abstract

The invention provides a profile control and channel plugging method of a super-heavy oil reservoir. The method includes the steps of firstly, injecting a reagent system into the stratum to form a first slug; secondly, injecting an inorganic plugging agent into the stratum to form a second slug; thirdly, injecting liquid carbon dioxide into the stratum to form a third slug so that profile control and channel plugging of the super-heavy oil reservoir can be completed, wherein the reagent system is prepared from, by weight, 0.5-0.6% of macromolecule polymer main agent, 0.1-0.15% of main chain reaction agent, 0.015-0.03% of branch chain reaction agent, 0.0015-0.02% of pH regulator, 0.025-0.03% of stabilizer, 6-10% of solid-phase particles and the balance water, and the inorganic plugging agent is prepared from 18-22% of slag abandoned after steelmaking, 3-5% of soil powder, 0.8-1% of sodium hydroxide and the balance water. By means of the technical scheme, the method is easy to construct and operate, and the problems that when the number of steam stimulation turns of the super-heavy oil reservoir is increased, steam channeling passageways are expanded and yield is reduced can be effectively solved.

Description

technical field [0001] The invention relates to a method for profile control and channel sealing of an oil field, in particular to a method for profile control and channel channel sealing of an ultra-heavy oil reservoir, belonging to the field of petroleum development. Background technique [0002] Ultra-heavy oil reservoirs (such as Shuguang Oilfield) encounter bottlenecks in the development process due to a series of problems such as uneven production and interwell steam channeling interference. Especially in recent years, with the increase of , the formation deficit is serious, the channel of steam channeling gradually expands, causing the impact of steam channeling to intensify, once steam channeling occurs in the oil well, it will not only lead to the energy overflow of the steam injection well, reduce the steam heat utilization rate, and the production effect will become worse round by round, but also will make the channeling well Well temperature, pressure, and water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13E21B43/16E21B43/22
CPCE21B33/13E21B43/16E21B43/164
Inventor 刘江玲黄小雷滕立勇刘昌龙梁建军
Owner PETROCHINA CO LTD
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