Alkali-free oil displacement system suitable for high-temperature high wax-bearing oil reservoirs and application thereof

A technology of alkali flooding and wax oil, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of fouling damage, poor oil displacement effect of oil displacement system, oil well and formation corrosion, etc., and achieve good technical results , high interfacial activity, and the effect of enhancing oil recovery

Active Publication Date: 2015-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that the existing oil displacement system has poor oil displacement effect under the conditi...

Method used

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  • Alkali-free oil displacement system suitable for high-temperature high wax-bearing oil reservoirs and application thereof
  • Alkali-free oil displacement system suitable for high-temperature high wax-bearing oil reservoirs and application thereof
  • Alkali-free oil displacement system suitable for high-temperature high wax-bearing oil reservoirs and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) palmitic acid amide carboxy betaine surfactant (R 1 =C 15 , R 2 =C 2 , R 3 =C 1 ) preparation

[0030] Add 0.5 mole of long carbon chain hexadecanoic acid methyl ester and the required amount of amidating reagent N,N-dimethylethylenediamine into the reaction kettle, react at 130°C for 6 hours, turn on the vacuum pump, and pump out the reaction generated Methanol and excess N,N-dimethylethylenediamine to obtain hexadecanoyl tertiary amine product, then add the required amount of sodium chloroacetate and react at 70°C for 12 hours, recrystallize and purify with absolute ethanol to obtain long Carbon chain betaine surfactant; wherein, methyl palmitate: N, N-dimethylethylenediamine: the mol ratio of sodium chloroacetate is 1:2:1.5.

[0031] (2) Preparation of non-alkali flooding system suitable for high temperature and high waxy reservoirs

[0032] Stir the prepared palmitic acid amide carboxy betaine surfactant, ultra-high molecular weight polyacrylamide with a ...

Embodiment 2

[0036] (1) Erucamide carboxybetaine surfactant (R 1 =C 21 , R 2 =C 3 , R 3 =C 1 ) preparation

[0037] Add 0.5 mole of methyl erucate and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 140°C for 8 hours, turn on the vacuum pump, and remove the methanol and excess methanol produced by the reaction. N,N-Dimethylpropylenediamine, to obtain erucic acid acyl tertiary amine product, then add the required amount of sodium chloroacetate, react at 75°C for 9 hours, recrystallize and purify with absolute ethanol to obtain long carbon chain betaine Surfactant; Wherein, the mol ratio of methyl erucate:N,N-dimethylpropylenediamine:sodium chloroacetate is 1:2.5:1.5.

[0038] (2) Preparation of non-alkali flooding system suitable for high temperature and high waxy reservoirs

[0039] Change "mycetamide carboxybetaine surfactant" into "erucamide carboxybetaine surfactant", and the rest are the same as in Example 1.

[0040] (3)...

Embodiment 3

[0043] (1) Erucamide carboxybetaine surfactant (R 1 =C 21 , R 2 =C 3 , R 3 =C 2 ) preparation

[0044] Add 0.5 mole of methyl erucate and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reactor, react at 145°C for 7 hours, turn on the vacuum pump, and remove the methanol and excess methanol produced by the reaction. N,N-Dimethylpropanediamine, to obtain the erucic acid acyl tertiary amine product, then add the required amount of β-chloropropionate sodium, react at 75°C for 10 hours, and obtain long Carbon chain betaine surfactant; wherein, the molar ratio of methyl erucate:N,N-dimethylpropylenediamine:β-sodium chloropropionate is 1:2:1.6.

[0045] (2) Preparation of non-alkali flooding system suitable for high temperature and high waxy reservoirs

[0046] Change "mycetamide carboxybetaine surfactant" into "erucamide carboxybetaine surfactant", and the rest are the same as in Example 1.

[0047] (3) Application of non-alkali flooding syste...

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Abstract

The invention relates to an alkali-free oil displacement system suitable for high-temperature high wax-bearing oil reservoirs and aims to mainly solve the problem that a present oil displacement system has poor oil displacement efficiency under the condition of high-temperature high wax-bearing oil reservoirs. The alkali-free oil displacement system suitable for high-temperature high wax-bearing oil fields comprises a long-carbon-chain betaine surfactant, polymer and water. The betaine surfactant is any one selected from carboxylate betaine and sulfonate betaine which are respectively as shown in the formula (I) and the formula (II), wherein R1 and R4 are any one independently selected from an alkyl group and an alkenyl group with C15-C29; R2 and R5 are any one selected from an alkylene group and a hydroxy-substituted alkylene group with C2-C5; and R3 and R6 are any one selected from an alkylene group and a hydroxy-substituted alkylene group with C1-C5. Water is selected from oilfield injection water. By the technical scheme, the above problem is solved well. The alkali-free oil displacement system can be used in tertiary oil recovery of high-temperature high wax-bearing oil fields.

Description

technical field [0001] The invention relates to an alkali-free flooding system suitable for high-temperature and high-wax reservoirs and its application. Background technique [0002] With the rapid growth of the national economy, the contradiction between domestic oil supply and demand has become increasingly prominent, mainly manifested in relatively poor oil and gas resources, oil exploration and development and proven reserves cannot keep up with the growth of demand, and the degree of crude oil recovery is relatively low. Some experts predict that the crude oil shortage in 2015 will reach 184 million tons. Such a large gap will be resolved by the international oil market, which will inevitably have an important impact on the sustainable development of my country's economy and pose a great threat to the country's energy security. In order to alleviate the shortage of my country's oil resources, reduce the gap in crude oil production, and ensure my country's oil security...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584C09K8/588
Inventor 张卫东唐恒志李应成沙鸥
Owner CHINA PETROLEUM & CHEM CORP
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