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Solid descaling acid rod for oil well

A solid acid and solid technology, which is applied in the field of scale remover for oil wells, can solve the problems of strong acid and strong corrosion, inconvenient production and use of strong irritants, local corrosion, and reduction of oil well liquid production, and achieves the success rate of removing resistance. Effect

Inactive Publication Date: 2012-02-22
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scaling brings many hazards to production. For example, scaling in formations will cause water injection pressure to increase and oil well fluid production to decrease. Scaling in pipelines will cause blockage and localized corrosion problems.
[0004] The successful development of conventional descaling agents has solved the need for oil well descaling, but in the application process, there are still defects such as strong corrosion, strong irritation and inconvenient production and use of strong acids.

Method used

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  • Solid descaling acid rod for oil well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of solid descaling acid stick for oil well:

[0017] Solid descaling acid stick for oil wells, its composition includes main acid, cement, weighting agent, anti-water absorption agent; said main acid includes:

[0018] Sulfamic acid, nitric acid powder, ethylenediaminetetraacetic acid (EDTA), penetrant, corrosion inhibitor, cleaning agent.

[0019] The cement adopts sodium carboxymethyl cellulose (CMC), and the weighting agent adopts zinc bromide ZnBr 2 , The anti-absorbing agent is cationic polyacrylamide, the penetrating agent is Pingpingjia with a polymerization degree of 30, the corrosion inhibitor is thiourea, and the cleaning agent is sodium dodecylbenzenesulfonate.

[0020] The composition of the solid descaling acid bar for oil wells is as follows according to weight percentage: 88.4% for solid acid, 1.8% for thiourea, 1.8% for sodium dodecylbenzenesulfonate, and 3.6% for Pingpingjia with a degree of polymerization of 30 %, sodium carboxymethylcell...

Embodiment 2

[0026] Embodiment 2: the influence of reaction temperature on descaling efficiency

[0027] The solid descaling acid stick prepared in Example 1 was selected to investigate the descaling efficiency of the solid descaling acid stick on calcium carbonate scale and calcium sulfate scale at different temperatures, and the reaction time was 24 hours. The test result of the solid descaling acid stick of the present embodiment is as follows table 1:

[0028] Table 1 Dissolved amount of solid descaling acid stick at different temperatures

[0029] Reaction temperature, °C

[0030] It can be seen from the table that with the increase of reaction temperature, the descaling efficiency increases, and the higher the temperature, the higher the descaling efficiency of calcium carbonate scale. For calcium sulfate scale, due to its poor solubility, its scale dissolving capacity is less than that of calcium carbonate scale. , The descaling efficiency is also lower than that of calci...

Embodiment 3

[0036] Example 3: Compatibility of solid descaling acid sticks with other treatment agents

[0037] In the treatment of oilfield sewage, in addition to descaling agents, it also contains a lot of oilfield additives, such as demulsifiers, corrosion inhibitors, bactericides, etc. Compatibility test was carried out between stabilizer FL and flocculant PC and the solid descaling acid stick prepared in Example 1. The scale removal rate is the scale removal rate of carbonate, the sterilization rate is tested according to the method specified in the oil and gas industry standard SY / T5890-93, and the corrosion inhibition rate is tested according to the method specified in the oil and gas industry standard SY / T5273-91. The test results of the solid descaling acid stick of this embodiment are shown in Table 3.

[0038] Table 3 Compatibility of solid descaling acid stick and other treatment agents

[0039]

[0040] It can be seen from the table that after adding other treatment agen...

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Abstract

The present invention discloses a solid descaling acid rod for an oil well. The rod comprises a main acid, a cementing agent, a weighting agent and a water-absorbent resistant agent. The main acid comprises: a solid acid, a penetrant, a corrosion inhibitor and a cleaning agent. In the prior art, the scale remover for the oil well has the following defects that: the strong acid in the scale remover has strong corrosion and strong irritation, the scale remover is inconvenient to produce and use, and the like. With the acid rod provided by the present invention, the defects in the prior art are solved. Compared to the conventional scale removers, the solid descaling acid rod provided by the present invention has advantages of strong solubility, weak acidity and the like, can effectively removing the scale, and does not cause corrosion to the pipe string and packer rubber.

Description

technical field [0001] The invention relates to a descaling agent for oil wells, in particular to a descaling agent whose main component is acid. Background technique [0002] Scaling of oilfield water is similar to waxing of crude oil, which is an inevitable problem in oilfield production. With the increase of oilfield water production, scaling problem becomes more and more prominent. [0003] The most common scales found in oil fields are calcium carbonate, calcium sulfate, strontium sulfate and barium sulfate. Scaling brings many hazards to production. For example, scaling in formations will cause water injection pressure to increase and oil well fluid production to decrease. Scaling in pipelines will cause blockage and localized corrosion. [0004] The successful development of conventional descaling agents has solved the needs of oil well descaling, but in the application process, there are still defects such as strong corrosion, strong irritation and inconvenient pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
Inventor 刘庆旺王继刚范振忠万家瑰娄艳敏叔贵新唐万丽
Owner NORTHEAST GASOLINEEUM UNIV
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