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Fire flooding oil reservoir combustion-supporting sealing method

A technology for oil reservoirs and fire flooding, applied in chemical instruments and methods, earth-moving drilling, sealing/packing, etc., can solve the problems of polluted strata, waste of effective resources, inability to burn profile control, sealing and channeling agents, etc., and achieves simple operation. , The effect of preparation is convenient

Active Publication Date: 2019-05-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The profile control method for fire flooding reservoirs mentioned in the above patents and articles, the profile control and channeling agent used cannot be burned, and has the problem of polluting the formation to varying degrees, wasting effective resources and affecting the increase in ultimate recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A certain well in an oilfield, 28 meters / 2 layers, has undergone 21 rounds of steam huff and puff, with a water content of 99%. At the end of the formation, the energy is insufficient and has no huff and puff value. It has been converted into a fire flooding injection well. According to previous data, there is a risk of gas channeling. For smooth ignition, implement the following process:

[0029] 1. Install the electric ignition tool according to the plan.

[0030] 2. Turbid liquid type combustion-supporting channeling agent: 40% dodecyl dimethyl betaine, 40% k-12 sodium lauryl sulfate, 18% calcium peroxide, 2% coke powder passed through a 200 mesh sieve, a small amount Thickener, percent by weight, industrial grade. Prepare 508 square meters of 5% uniform turbid solution with clear water on site. Injection pressure 0.5-5.2MPa, injection speed 25m 3 / h.

[0031] 3. Wash the preparation tank of the above-mentioned combustion-supporting channeling agent with clean wa...

Embodiment 2

[0036] This embodiment is completed with other combustible plugging agents as the first slug.

[0037] In an oilfield, Yulou oil layer fire flooding injection well, 14 sub-layers were drilled for 10 meters, water flooded, and there was no oil in the well flushing. According to the data of adjacent wells, there is a risk of gas channeling. For smooth ignition, implement the following process:

[0038] 1. Install the electric ignition tool according to the plan.

[0039] 2. Combustion-supporting channeling agent: 40% dodecyl dimethyl betaine, 40% k-12 sodium lauryl sulfate, 20% ammonium persulfate, percentage by weight, industrial grade. Prepare 10% solution with clear water, and inject 208 square meters into the first slug. Injection pressure 0.5MPa, injection speed 30m 3 / h.

[0040] 3. Wash the tank of the above-mentioned combustion-supporting channeling agent with clean water, and the washing solution is continuously injected into the formation for 180 square meters as t...

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PUM

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Abstract

The invention discloses a fire flooding oil reservoir combustion-supporting sealing method. According to the method, a combustion-supporting sealing agent is injected into an injection well to carry out combustion-supporting sealing, wherein the combustion-supporting sealing agent comprises a foaming agent and a combustion-supporting agent. Further, the combustion-supporting sealing agent is a solution type combustion-supporting sealing agent or a turbid liquid type combustion-supporting sealing agent, can be independently used, and can also be matched with other profile control agents for slug construction. The combustion-supporting sealing method is suitable for injection wells which are located in thick oil blocks, have the relatively low water content of 90-95% and relatively high oilsaturation, have certain deficiency in near-well zones, need fire flooding but have gas channeling risks. The combustion-supporting sealing agent is injected through a certain technology so that livewire propulsion is uniform and stable, and combustion is sufficient.

Description

technical field [0001] The invention belongs to the field of oil field application. In particular, it relates to a method for combustion-supporting channeling sealing of fire flooding oil reservoirs. Background technique [0002] Fire flooding is to use heavy components in formation crude oil as fuel, use air or oxygen-enriched gas as a combustion aid, adopt methods such as spontaneous combustion and artificial ignition to make the temperature of the oil layer reach the ignition point of crude oil, and continuously inject combustion aids to make the oil layer continue to burn , the combustion reaction generates a large amount of heat, heating the oil layer, so that the temperature of the oil layer rises to 600-700 ° C, the heavy components are cracked at high temperature, the injected gas, the light oil generated by the cracking of heavy oil, the gas generated by combustion and water vapor are used It is used to drive the flow of crude oil to and from production wells. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/243E21B33/13C09K8/592
Inventor 尹长海马春宝王德伟姚长江高玉军贾财华段效威刘长环陈雪桑雨熊忠平曲冬雪周明旺黄海礁朱立军
Owner PETROCHINA CO LTD