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Water flooding oil reservoir fireflood production well selective water controlling and channelling sealing method

A selectivity and production well technology, applied in chemical instruments and methods, earthwork drilling, sealing/isolation, etc., can solve problems that cannot meet the actual needs of oilfield sites, and achieve clear purpose, strong selectivity, and simple operation 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

However, it cannot meet the actual needs of the oilfield site

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A well in Liaohe Oilfield has a treatment section of 998.3-1032.9 meters, 16.2 meters per 10 layers, with an average effective porosity of 32%. Before construction, the daily fluid production was 27 cubic meters and the daily oil production was 1 ton. Use the papermaking black liquor (total solids concentration of 8%) after pulp separation in the paper mill, pass it through a 200-mesh sieve, and put it in a tank for later use. Dilute the processed papermaking black liquor 10 times on site, then add 1% sodium oxalate by weight, use a pump truck, control the injection speed to 15 cubic meters per hour, and squeeze it into the formation. Stop construction. Then use 500 square meters to form a weak gel with a viscosity of about 2000mPa.s, perform water-controlled sealing, replace the annulus of the hot sewage oil jacket with the same amount, and then shut down the well for three days. In the early stage after the well was opened, the daily liquid production was 20 cubic me...

Embodiment 2

[0043] For a well in Liaohe Oilfield, the treatment layer is Xinglongtai, the treatment section is 1094-1142.2m, the effective thickness / number of layers is 17.8 / 11, and the average effective porosity is 27.87%. Before construction, the daily output of liquid was 31 cubic meters, and the daily output of oil was 1.5 tons. It was detected that the carbon dioxide content in the output fluid was 15%, the oxygen content was 3%, and the hydrogen sulfide content was 552ppm. Use clear water on site to prepare a channeling agent with 1.5% sodium fatty alcohol polyoxyethylene ether sulfate, 1% sodium oxalate, 0.02% sodium carboxymethylcellulose, and 2% calcium hydroxide clear liquid. Squeeze into the formation with a pump truck, inject 3,000 cubic meters, use 78 cubic meters of emulsified heavy oil for water control sealing, shut down the well for 3 days, and open the well for production. One month after the well was opened, it was detected that the carbon dioxide content was 4.5%, the ...

Embodiment 3

[0045] In a well in Liaohe Oilfield, the treatment section is 942.4-987.4m, the effective thickness / number of layers is 19.7 / 13, and the average effective porosity is 21.95%. Before construction, the daily liquid production was 25.9 cubic meters, the daily oil production was 0.93 tons, and the water content was 96.4%. It was detected that the carbon dioxide content in the produced fluid was 18%, the oxygen content was 4.5%, and the hydrogen sulfide content was 325ppm. Use clear water on site to prepare a channeling agent with 3% sodium lauryl sulfate, 2% sodium oxalate, 0.02% polyacrylamide (molecular weight: 15 million), and 3% calcium hydroxide clear liquid. Squeeze into the formation with a pump truck, and the injection volume is 4000 cubic meters. 120m3 of emulsified heavy oil was used for water control sealing treatment, the well was shut down for 3 days, and the well was put into production. One month after the well was opened, the carbon dioxide content was detected t...

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Abstract

The invention provides a water flooding oil reservoir fireflood production well selective water controlling and channelling sealing method. The method comprises the steps that a gas channelling preferential migration pathway is sealed and blocked using a channelling sealing agent; and high water-cut preferential migration pathways near an oil well are selectively sealed and blocked. The channelling sealing agent comprises an alkali-resistant surfactant foaming agent and an auxiliary alkaline reducing agent; and the alkali-resistant surfactant foaming agent is selected from one or more of sodium lauryl sulfate, fatty alcohol polyoxyethylene ether sodium sulfate, rosin soap materials, animal and vegetable protein materials, papermaking black liquor and the like, and the auxiliary alkaline reducing agent is sodium oxalate. The water flooding oil reservoir fireflood production well selective water controlling and channelling sealing method is a selective water controlling and channelling sealing integrated technology.

Description

technical field [0001] The invention relates to a method for selectively controlling water sealing and channeling of fire flooding production wells in water flooded oil reservoirs, specifically a method for selectively controlling water sealing and channeling of fire flooding production wells in water flooded oil reservoirs, belonging to oil production field. Background technique [0002] Incineration oil formation technology, also known as fire flooding, is a recovery technology that can greatly increase the recovery of heavy oil reservoirs. Fire flooding is to use the heavy components in the formation crude oil as fuel, and use air or oxygen-enriched gas as a combustion aid , using 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 a combustion accelerant to make the crude oil in the oil layer continue to burn. The oil is cracked at high temperature, the inj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12E21B43/243C09K8/594C09K8/508
CPCC09K8/5086C09K8/594E21B33/12E21B43/243
Inventor 马春宝陆福刚于萍尉小明王凯王晨皓马子健王德伟高玉军桑雨李新朱宇宸
Owner PETROCHINA CO LTD
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