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Activating agent for water plugging and water-plugging thickened oil activating agent prepared from same

A technology for activator and water, which is applied in drilling compositions, chemical instruments and methods, wellbore/well components, etc., which can solve the problem of unsatisfactory emulsification effect of heavy oil, high requirements for reservoir physical properties, and inability to form Plugging strength and other issues, to achieve the effect of strong selective water blocking ability, excellent decontamination, and reduced total consumption

Active Publication Date: 2015-08-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyacrylamide water shutoff agents are affected by formation temperature, have poor gelation stability and short validity period, and activated heavy oil water shutoff, as a well selectivity and no damage to oil well water shutoff technology, has attracted extensive attention in recent years. The key problem of this technology is to optimize the suitable crude oil emulsifier. CN102061153A and CN102676137A respectively disclose a crude oil emulsifier for oil well water plugging and its preparation method. The raw materials of the emulsifier are dimethylamine, epichlorohydrin, oil acid and water
However, through indoor research, it has been found that the emulsifier has problems such as volatile, flammable, and toxic raw materials. It needs to be prepared in the reactor in advance. The preparation process is violently exothermic, and the operation is dangerous. When the crude oil is easily emulsified on the ground, it cannot be injected into the formation and other problems
[0004] CN104130760A discloses a high-condensation heavy oil activator and a water-plugging method for water plugging. Although the process is simple, the compatibility with the formation is good, the selective water plugging ability is strong, and the emulsification effect is very good for high-condensation heavy oil, but The emulsification effect of heavy oil is not ideal, and the plugging strength required for on-site water plugging cannot be formed. The validity period of water plugging is limited, and the cost is still high

Method used

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  • Activating agent for water plugging and water-plugging thickened oil activating agent prepared from same
  • Activating agent for water plugging and water-plugging thickened oil activating agent prepared from same
  • Activating agent for water plugging and water-plugging thickened oil activating agent prepared from same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present embodiment provides an activator for water shutoff, which comprises the following composition:

[0031] Lauryl polyoxyethylene ether (2) sodium sulfate, the molecular formula is C 12 h 23 O(CH 2 CH 2 O) 2 SO 3 Na: 5 parts by weight;

[0032] Dodecyl hydroxyethyl imidazoline: 2 parts by weight;

[0033] Cetyltrimethylammonium chloride: 1 part by weight.

[0034] The preparation method of above-mentioned water blocking activator comprises the following steps:

[0035] Add lauryl polyoxyethylene ether (2) sodium sulfate and lauryl hydroxyethyl imidazoline into the mixing tank in sequence, after mixing evenly, add cetyltrimethylammonium chloride and stir evenly to obtain Activator for water blocking.

Embodiment 2

[0037] This embodiment provides a heavy oil activator for water shutoff, which is prepared by mixing the water shutoff activator and heavy oil.

[0038] The above-mentioned activator for water plugging comprises the following composition:

[0039] Sodium tetradecyl polyoxyethylene ether (3) sulfate, the molecular formula is C 14 h 27 O(CH 2 CH 2 O) 3 SO 3 Na: 6 parts by weight;

[0040] 2-Alkyl phosphoethyl imidazoline: 2 parts by weight;

[0041] Lauryltrimethylammonium chloride: 0.8 parts by weight.

[0042] The preparation method of the activator for water blocking comprises the following steps: adding tetradecyl polyoxyethylene ether (3) sodium sulfate and 2-alkylphosphonic ethyl imidazoline into a stirring tank in sequence, after mixing evenly, adding twelve Stir the alkyltrimethylammonium chloride evenly to obtain the activator for water blocking.

[0043] The preparation method of the heavy oil activator for water plugging comprises the following steps: after uni...

Embodiment 3

[0050] This embodiment provides a heavy oil activator for water shutoff, which is prepared by mixing the water shutoff activator and heavy oil.

[0051] The above-mentioned activator for water plugging comprises the following composition:

[0052] Cetyl polyoxyethylene ether (4) ammonium sulfate, the molecular formula is C 16 h 31 O(CH 2 CH 2 O) 4 SO 3 Na: 7 parts by weight;

[0053] 1-hydroxyethyl-2-oleyl imidazoline: 3 parts by weight;

[0054] Lauryl dimethyl benzyl ammonium chloride: 1.2 parts by weight.

[0055] The preparation method of the activator for water blocking comprises the following steps: adding cetyl polyoxyethylene ether (4) ammonium sulfate and 1-hydroxyethyl-2-oleyl imidazoline into a stirring tank in sequence, and after mixing evenly, adding Dodecyl dimethyl benzyl ammonium chloride is stirred evenly to obtain an activator for oil well water plugging.

[0056] The preparation method of the above-mentioned heavy oil activator for water plugging co...

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Abstract

The invention provides an activating agent for water plugging, and a water-plugging thickened oil activating agent prepared from the same. The water-plugging thickened oil activating agent is formed by mixing the activating agent for the water plugging and thickened oil, wherein the activating agent for the water plugging comprises a main agent and auxiliaries, and the main agent comprises a higher fatty alcohol-polyoxyethylene ether sulfate anionic surfactant and an imidazoline zwitterionic surfactant. The invention further provides a method for performing oil well water plugging by utilizing the water-plugging thickened oil activating agent. The water-plugging thickened oil activating agent has the advantages that the environment is low in toxicity and pollution-free, the field operation process is simple, the compatibility with a stratum is good, the selective water plugging performance is high, and the water-plugging thickened oil activating agent is suitable for thickened oil and super heavy oil deposits; furthermore, the use amount of the raw materials is small, the cost is low, no toxicity exists, nonvolatility and nonflammability are achieved, the operation is safe, no clean water or deionized water needed is needed for blending, and the problem that crude oil is emulsified on the ground and therefore cannot be injected into the stratum is avoided during field construction.

Description

technical field [0001] The invention belongs to the field of oil well water shutoff, in particular to an activator for water shutoff and a heavy oil activator for water shutoff made from the same. Background technique [0002] The oilfield has entered the middle and late stage of water flooding development, the water cut continues to rise, and the production declines rapidly. Only through profile control, the effect of measures is not ideal, and it is difficult to stabilize oil and control water. Therefore, it is necessary to adopt the working idea of ​​"combining blockage adjustment". At present, most of the commonly used water plugging technologies are non-selective plugging agents, which are more effective for oil wells with clear water zones, large interlayers, and good well conditions. However, for oil wells that are difficult to find water, especially edge water, bottom water, and injection water layer intrusion, oil and water are in the same layer, non-selective wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/502E21B33/138
CPCC09K8/502E21B33/138
Inventor 陈小凯刘德铸张洪君曾双红王浩朱伟李国瑞刘强宋驰倪雪宝吴志俊刘成志于翔李明陈凯
Owner PETROCHINA CO LTD
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