Temperature-resisting salt-tolerant foam adjusting displacing system prepared from high-salinity formation water

A high-salinity, temperature-resistant and salt-resistant technology, which is used in mining fluids, drilling compositions, chemical instruments and methods, etc. Difficulties and other problems to achieve the effect of improving oil washing efficiency, improving temperature and salt resistance, and increasing swept volume

Active Publication Date: 2019-03-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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AI Technical Summary

Problems solved by technology

Tertiary oil recovery mainly changes the water-oil mobility ratio by adding chemical substances, thereby enhancing oil recovery. At present, alkali flooding, polymer flooding, surfactant flooding, and binary or three-element compound flooding are commonly used. The tertiary oil recovery method is currently difficult to adapt to high temperature and high salinity formations, and it is difficult to overcome the limited degree of enhanced oil recovery and other problems
For Xinjiang Tahe Oilfield, where fresh water resources are scarce and reservoir conditions are relatively harsh (temperature is 130°C, total salinity is 220,000 mg / L), the use of simple surfactants is firstly difficult to configure, and secondly, the foam system is under high-temperature and high-salt conditions Defoaming is easy to occur, and most of the current oil displacement foam systems use organic foam stabilizers, which have poor heat and salt resistance and cannot be applied to high temperature and high salt reservoirs

Method used

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  • Temperature-resisting salt-tolerant foam adjusting displacing system prepared from high-salinity formation water
  • Temperature-resisting salt-tolerant foam adjusting displacing system prepared from high-salinity formation water
  • Temperature-resisting salt-tolerant foam adjusting displacing system prepared from high-salinity formation water

Examples

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preparation example Construction

[0042] A method for preparing a temperature- and salt-tolerant foam profile control and flooding system prepared from high-salinity formation water. The steps are as follows:

[0043] (1) Under the condition of 25℃, add citrate in the water first, stir for 3-5 minutes to fully dissolve the citrate, and then add nano-SiO 2 Stir for 3-5 minutes and then ultrasonic for 60 minutes to make nano SiO 2 Disperse evenly in water to obtain nano SiO 2 Dispersed aqueous solution;

[0044] (2) In nano SiO 2 Add the surface active agent THSB to the dispersed aqueous solution, stir for 3-5 minutes to fully dissolve, and obtain the first mixed solution;

[0045] (3) Add partially hydrolyzed HPAM to the first mixed solution, and continue to stir the solution for 6 hours to obtain a temperature- and salt-tolerant foam profile control and flooding system prepared from high-salinity formation water.

[0046] An oil displacement method of a temperature-resistant, salt-tolerant foam profile control and disp...

Embodiment 1

[0057] This example evaluates the flocculation, foaming and foam stabilization performance of a temperature-tolerant and salt-tolerant foam profile control and flooding system prepared from high-salinity formation water.

[0058] At 25℃, prepare nano SiO 2 The mass fraction of 1%, the mass fraction of THSB is 0.05%, the mass fraction of partially hydrolyzed HPAM is 0.1%, the average molecular weight is 4 million, the degree of hydrolysis is 6%, the mass fraction of sodium citrate is 0.1%, and the balance is water. , The water is simulated mineralized water prepared according to reservoir conditions, with a total salinity of 220,000 mg / L, of which Ca 2+ With Mg 2+ The ion concentration is 2000mg / L.

[0059] Such as figure 1 As shown, under unstirred conditions, the control and flooding system flocculates less at 25°C and 220,000 mg / L. After aging under high temperature conditions, such as figure 2 As shown, when the solution is placed in an ampoule and sealed in a thermostatic oven ...

Embodiment 2

[0064] A temperature-resistant and salt-resistant foam profile control and flooding system prepared from high-salinity formation water, including the following mass fraction components: 1.5% nano-SiO 2 , 0.1% THSB, 0.15% partially hydrolyzed polyacrylamide (HPAM), the average molecular weight is 6 million, the degree of hydrolysis is 8%, 0.1% potassium citrate, the balance is water, and the total mass fraction of each component is 100% , The water is simulated mineralized water prepared according to reservoir conditions, with a total salinity of 220,000 mg / L, of which Ca 2+ With Mg 2+ The ion concentration is 2000mg / L.

[0065] A method for preparing a temperature- and salt-tolerant foam profile control and flooding system prepared from high-salinity formation water. The steps are as follows:

[0066] (1) Under the condition of 25℃, add 0.15g potassium citrate to 99.25g simulated mineralized water, stir to fully dissolve potassium citrate, and then add 1.5g nano-SiO 2 Stir for 3-5 m...

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Abstract

The invention discloses a temperature-resisting salt-tolerant foam adjusting displacing system prepared from high-salinity formation water. The temperature-resisting salt-tolerant foam adjusting displacing system comprises the following components by weight percent: 0.5%-2% of nano-SiO2, 0.01-2% of THSB, 0.01-0.5% of HPAM, 0.01-0.3% of citrate and the balance of water. The invention discloses a preparation method of the temperature-resisting salt-tolerant foam adjusting displacing system. The preparation method comprises the following steps: firstly adding citrate and nano-SiO2 into water at 25 DEG C; stirring and then ultrasonically treating; adding THSB and stirring; adding partial hydrolysis HPAM and stirring, thereby acquiring the end product. The invention also discloses an oil displacement method adopting the adjusting displacing system. The oil displacement method comprises the following steps: (1) injecting a THSB aqueous solution on a prepositioned pretreated section into stratum; (2) injecting an adjusting displacing system and a pure nitrogen system of a main section into stratum; (3) injecting a nano-SiO2 aqueous solution on a post-positioned protection section into stratum; (4) closing well for 5-10 days, opening the well and recovering production. The compound adjusting displacing system provided by the invention can be applied to high-temperature high-salinity oil deposit and has high ageing stability. Multiple alternate oil displacing sections are arranged, so that the oil displacement effect of the system is extremely promoted.

Description

Technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a temperature- and salt-tolerant foam profile control and flooding system prepared from high-salinity formation water. Background technique [0002] After primary oil recovery and secondary oil recovery in major domestic oil fields, the water content of crude oil has steadily increased, and most of the oil fields have entered the tertiary oil recovery stage. Tertiary oil recovery mainly changes the water-to-oil mobility ratio by adding chemicals to increase the oil recovery. At present, alkaline flooding, polymer flooding, surfactant flooding, and binary or ternary combination flooding are more commonly used. At present, tertiary oil recovery methods are difficult to adapt to high-temperature and high-salt formations, and it is difficult to overcome problems such as limited degree of enhanced oil recovery. [0003] Nanomaterials are emerging materials that have attracted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58E21B43/22
CPCC09K8/58C09K2208/10E21B43/16
Inventor 戴彩丽吴一宁赵明伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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