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Corrosion and scale inhibitor for oil well in high water cut stage

A technology of corrosion and scale inhibitor, high water content period, applied in wellbore/well components, drilling composition, earthwork drilling and other directions, can solve the problems of waste of maintenance costs, affecting production capacity and other problems, and achieve pump inspection cycle prolonged effect

Active Publication Date: 2013-04-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Frequent pump inspection not only affects production capacity, but also causes huge waste of maintenance costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: For the corrosion and scale inhibitor of oil wells in high water cut period, the weight ratio of each component is:

[0040] 1. Di-o-methylthiourea: 3.25%;

[0041] 2. Ethylenediamine tetramethylene phosphonate: 13.5%;

[0042] 3. Dodecyl butylamine methyl sulfide: 8.1%;

[0043] 4. Tetradecyltributylphosphonium chloride: 3%;

[0044] 5. DN-3212 acrylic acid, organic phosphine and sulfonic acid copolymer: 16.2%;

[0045] 6. M-505A corrosion inhibitor: 5.25%;

[0046] 7. SL-2 series corrosion and scale inhibitors: 7.15%;

[0047] 8. Methanol: 5%;

[0048] 9. Herotropine: 3.4%;

[0049] 10. Vitamin A: 0.05%;

[0050] 11. Water is 35.1%, and the sum of the weight percentages of each component is 100%.

[0051]Production method: First, four raw materials such as di-o-methylthiourea, dodecylbutylamine methyl sulfide, ethylenediamine tetramethylene phosphonate, and tetradecyltributylphosphonium chloride are prepared according to the The weight ratio is ...

Embodiment 2

[0053] Embodiment 2: The production method is the same as in Example 1, and the sum of the weight percentages of each component is 100%.

[0054] 1. Di-o-methylthiourea: 3.45%;

[0055] 2. Ethylenediamine tetramethylene phosphonate: 13.3%;

[0056] 3. Dodecylbutylamine methyl sulfide: 8.2%;

[0057] 4. Tetradecyltributylphosphonium chloride: 3.1%;

[0058] 5. DN-3212 acrylic acid, organic phosphine and sulfonic acid copolymer: 16%;

[0059] 6. M-505A corrosion inhibitor: 5.35%;

[0060] 7. SL-2 series corrosion and scale inhibitors: 7.05%;

[0061] 8. Methanol: 5.5%;

[0062] 9. Herotropine: 3.5%;

[0063] 10. Vitamin A: 0.052%;

[0064] 11. Water is 34.498%.

[0065] When the dosage is 60mg / l, the corrosion inhibition rate of the oil well reaches 85%, and the scale inhibition rate reaches 95%.

Embodiment 3

[0066] Embodiment 3: the production method is the same as in embodiment 1, and the sum of the weight percentages of each component is 100%.

[0067] 1. Di-o-methylthiourea: 3.65%;

[0068] 2. Ethylenediamine tetramethylene phosphonate: 13.2%;

[0069] 3. Dodecylbutylamine methyl sulfide: 8.2%;

[0070] 4. Tetradecyltributylphosphonium chloride: 3.15%;

[0071] 5. DN-3212 acrylic acid, organic phosphine and sulfonic acid copolymer: 15.6%;

[0072] 6. M-505A corrosion inhibitor: 5.55%;

[0073] 7. SL-2 series corrosion and scale inhibitors: 6.95%;

[0074] 8. Methanol: 5.9%;

[0075] 9. Herotropine: 3.6%;

[0076] 10. Vitamin A: 0.052%;

[0077] 11. Water is 34.148%.

[0078] When the dosage is 58mg / l, the corrosion inhibition rate of the oil well reaches 86%, and the scale inhibition rate reaches 93%.

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Abstract

The invention relates to a corrosion and scale inhibitor for an oil well in a high water cut stage, which is applicable to corrosion and scale inhibition of an oilfield. The corrosion and scale inhibitor comprises the following components in percentage by weight: 3.25-4.0% of o-dimethyl thiourea, 12.5-13.5% of ethylenediamine tetramethylene phosphonate, 8.0-8.5% of dodecyl butylamine methyl sulfide, 3.0-3.25% of tetradecyl tributyl phosphonium chloride, 15.0-16.2% of DN-3212 acrylic acid, organic phosphine and sulfonic acid copolymer, 5.25-5.75% of M-505A corrosion inhibitor, 6.85-7.25% of SL-2 corrosion and scale inhibitor, 5.0-7.5% of methanol, 3.4-3.75% of methenamine, 0.05-0.055% of vitamin A and the balance of water, wherein the sum of the weight percentage of each component is100%. The corrosion and scale inhibitor has the effects that: when the addition amount of the corrosion and scale inhibitor is 50-60 mg / L, the corrosion inhibition rate of the oil well reaches more than 85%, and the scale inhibition rate reaches more than 90%; and the average pump examination period is prolonged by more than one time.

Description

technical field [0001] The invention relates to the field of oil recovery technology, in particular to a corrosion and scale inhibitor for oil wells in high water-cut period. Background technique [0002] The oil field has entered a period of high water cut, and due to the high degree of salinity in the water, serious corrosion and scaling have occurred in oil wells. Although technicians have taken various control measures, the methods adopted vary greatly due to the actual situation of the oil field. [0003] Zhang Lianming et al. published the article "Development and Application of Oil Well Corrosion and Scale Inhibitors" in the 6th Oilfield and Gas Field Surface Engineering in 2001, pointing out that the salinity of formation water in the production medium of some oil wells in Zhongyuan Oilfield is high, and Ca 2+ , Mg 2+ , SO 4 2- 、HCO 3 - , SO 2 And SRB content is high, pH value is low, this output medium has a high corrosion and scaling tendency. Adding one-wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54C09K8/52
Inventor 胡书宝付亚荣吕德福李冬青付茜付丽霞
Owner PETROCHINA CO LTD
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