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Echelon releasing method for underground solid anticorrosion and antiscale agents

A kind of anti-scaling agent and solid technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as difficult to improve and prolong pump inspection period

Active Publication Date: 2013-05-01
XINJIANG KELI NEW TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the above shortcomings, after implementing solid anti-corrosion and anti-scaling measures in pumping wells, the pump inspection period is extended from 2 months to 8 months, and it is difficult to further improve

Method used

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  • Echelon releasing method for underground solid anticorrosion and antiscale agents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In an oilfield operation area of ​​Xinjiang Oilfield Company, the pump hanging depth is 2135.94 meters, the well temperature is 71 degrees, the liquid production rate is 5 cubic meters per day, and the water content is 60%. The calcium loss rate is 9.6%, the total iron content is 27mg / L, and the corrosion and scaling are serious; at this time, the screen tube is used, and the solid anti-corrosion and anti-scaling agent 1 is added, and the dosage is 90Kg, and then the screen tube is suspended under the pump. After the implementation, the calcium loss rate of water in the produced fluid was reduced to 1.1%, the total iron content was reduced to 2.1mg / L, the pump inspection cycle was extended to 418 days, and the corrosion and scaling were effectively controlled.

Embodiment 2

[0025] In an oilfield operation area of ​​Xinjiang Oilfield Company, the pump hanging depth is 1704.98 meters, the well temperature is 56 degrees, the fluid production rate is 13.8 cubic meters per day, and the water content is 86%. The calcium loss rate was 20.5%, the total iron content was 10.8mg / L, and the corrosion and scaling were serious; at this time, 120Kg of solid anti-corrosion and anti-scaling agent 1 was added to the wellhead, and the calcium loss rate in the produced fluid was reduced to 3.2% after the measures were implemented. The total iron content was reduced to 1.7mg / L, the pump inspection cycle was extended to 362 days, and the corrosion and scaling were effectively controlled.

Embodiment 3

[0027] In an oilfield operation area of ​​Xinjiang Oilfield Company, the pump hanging depth is 1197.79 meters, the well temperature is 40 degrees, the liquid production rate is 12 cubic meters per day, and the water content is 61%. The calcium loss rate is 15.7%, the total iron content is 18.2mg / L, and the corrosion and scaling are serious. At this time, 120Kg of solid anti-corrosion and anti-scaling agent 2 is added to the wellhead. After the measures are implemented, the calcium loss rate of the water in the produced fluid is reduced to 3.1%. The total iron content was reduced to 2.5mg / L, the pump inspection cycle was extended to 371 days, and the corrosion and scaling were effectively controlled.

[0028] The dissolution rate that the present invention adopts is 0.12g / cm 2 The imidazoline corrosion inhibitor of *h can be obtained by the following method:

[0029] Add 0.2mol naphthenic acid (molecular weight 180-200) and 41.6g (0.22moL) tetraethylenepentamine to the three-n...

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Abstract

The invention provides an echelon releasing method for underground solid anticorrosion and antiscale agents, and the method comprises the following steps of step 1: charging imidazoline inhibitor with a dissolving speed of 0.12g / cm<2>*h, imidazoline inhibitor with a dissolving speed of 0.01g / cm<2>*h, organic phosphonate antiscale agent and clay or kaolin into a tablet press according to a proportion of 0.4: 1.6: 1: 2 to a prepare solid anticorrosion and antiscale agent 1; step 2: charging the imidazoline inhibitor with the dissolving speed of 0.12g / cm<2>*h, the imidazoline inhibitor with the dissolving speed of 0.05g / cm<2>*h, organic phosphonate antiscale agent and clay or kaolin into a tablet press according to a proportion of 0.4: 1.6: 1: 2 to prepare a solid anticorrosion and antiscale agent 2; selecting the solid anticorrosion and antiscale agent 1 when the underground temperature is more than 50DEG C, and selecting the solid anticorrosion and antiscale agent 2 when the underground temperature is less than 50DEG C; and directly charging the solid anticorrosion and antiscale agents before a tubular post is arranged or charging the solid anticorrosion and antiscale agent into a sieve tube, which is hung under a pump, to charge the solid anticorrosion and antiscale agent into an oil well.

Description

technical field [0001] The invention relates to downhole solid anti-corrosion and anti-scaling technology of oil pumping wells in oil fields, and is especially suitable for a stepwise release method of solid slow-release agents. Background technique [0002] Downhole corrosion and fouling of oil pumping wells is a common problem in oilfield development. Similar problems have occurred in Daqing Oilfield, Shengli Oilfield, Tarim Oilfield, Tuha Oilfield, Jiangsu Oilfield, and Jilin Oilfield in China, which have seriously affected the normal production of oilfields. Impact. In order to suppress downhole corrosion and scaling, various oilfields have carried out related research work, forming downhole solid anti-corrosion and anti-scaling technology, wellhead dosing liquid corrosion and scale inhibitor technology, downhole suspension dripping drug device technology, and downhole magnetic anti-scaling technology And other downhole anti-corrosion and anti-scaling technologies, amon...

Claims

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Application Information

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IPC IPC(8): E21B41/02C09K8/54C09K8/52
Inventor 连贵宾吴君王中武何志刚李海涛刘冬梅张文辉卜魁勇陈文颜亨兵
Owner XINJIANG KELI NEW TECH DEV
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