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A method to reduce the risk of emulsification of heavy oil during steam stimulation

A heavy oil and steam technology, which is applied in the direction of earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems that the formation emulsification cannot be effectively solved, accelerate the emulsification of heavy oil, and frequently operate the process, so as to reduce the emulsification of heavy oil Risk, operability, and effect of improvement

Active Publication Date: 2021-08-06
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0003] The reports of existing patents and scientific literature mainly focus on the emulsification mechanism and treatment after emulsification in the process of heavy oil cold recovery development, and solve the problem of emulsification of heavy oil in the wellbore after emulsification, but it is not effective for the problem of formation emulsification solve
In the process of steam stimulation, due to the high temperature of the injected fluid (usually around 300°C) and frequent operations (steam injection first, then spraying, and then pump production), the risk of heavy oil emulsification is accelerated. The existing cold recovery process It is difficult to solve the emulsification problem of steam huff and puff wells in heavy oil reservoirs

Method used

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  • A method to reduce the risk of emulsification of heavy oil during steam stimulation
  • A method to reduce the risk of emulsification of heavy oil during steam stimulation
  • A method to reduce the risk of emulsification of heavy oil during steam stimulation

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example

[0064] Implementation case 1: The third round of huff and puff drainage of well A23H in Lvda 27-2 oilfield in Bohai Sea was not timely resulting in emulsification and poor huff and puff effect.

[0065] Figure 12 It is the location of two steam huff and puff wells in Luda 27-2 oilfield.

[0066] Figure 13(a) shows the daily oil production and water cut curve of Well A23H in Lvda 27-2 Oilfield, which is divided into three stages: the natural energy depletion exploitation stage, the main goal is to determine the production capacity of cold recovery; the first round of steam huff and puff, injection Steam 4500m 3 , the bottom hole injection temperature is 340℃; the second round of steam huff and puff, injecting steam 5250m 3 , Bottom hole injection temperature is 340°C. The viscosity of degassed and dehydrated crude oil in Well A23H at 50°C was 2462mPa·s. After the second round of huff and puff well was opened, the production capacity dropped rapidly. After sampling, the visc...

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Abstract

The present invention discloses a method of reducing the risk of thick oil emulsification in the process of steam throughput, including the following steps: analyzes the glue and asphalt content of thick oil samples, and determines the emulsification mechanism of the target oil field through experiments;Self -spray 不同 Pump to produce the heat loss rate indicators at different stages to determine the best time to increase the speed of oil well production; evaluate the diameter of the stratum crude oil flow based on the injection temperature and cyclical vapor injection volume, and use the sand out of the target oil field. c As the highest value of the volume of liquid liquid; after the well finish, spray self -spray, gradually let go of the oil mouth, and make the Nissan fluid speed Q as much as possible L Maximum (requiring Q L << c ); After the self -spray is ended, add the electric submarine pump, and gradually increase the frequency of pumps in time after the pump is enabled to use the maximum Nissan liquid ability Q Lmax Return to high temperature liquid (requiring Q Q Lmax << c ); According to CMG digital mold software, quantitative evaluation of different drainage speed Q L The impact on cyclical oil production, and predict the flow temperature at the bottom of the well at different discharge speed T BHP And select high temperature resistance pump (electric pump temperature resistance T max T BHP To.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and particularly relates to a method of adjusting the frequency of an electric submersible pump and the size of an oil nozzle according to the effective free flow radius of the formation and the critical sand production rate in the optimal time window for steam injection thermal recovery wells. Without increasing the risk of sand production, increase the daily liquid production rate of the oil well, thereby reducing the risk of emulsification of heavy oil during steam stimulation. Background technique [0002] Thermal oil recovery technology (such as steam huff and puff, steam flooding, steam-assisted gravity drainage, etc.) is an effective technology that can greatly improve the recovery of heavy oil fields, and is an effective means of onshore heavy oil development. The Bohai Sea has a large scale of heavy oil reserves and a wide range of heavy oil viscosities (the viscosity of c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24
CPCE21B43/24
Inventor 刘东朱琴苏彦春马奎前刘宗宾蔡晖葛丽珍张风义胡廷惠王树涛
Owner CHINA NAT OFFSHORE OIL CORP
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