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Anti-scaling agent for oil well silicate scale

A technology of silicate and anti-scaling agent, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problem of low silicate scale anti-scaling rate, affecting the normal production of oil fields, the economic benefits of ASP flooding, and the stuck pump etc.

Active Publication Date: 2012-07-04
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the injection of the ternary system, the phenomenon of silicate scaling in production wells is becoming more and more serious. Common anti-scaling agents have a very low anti-scaling rate on silicate scales. Continuous scaling will lead to pump stuck, broken rods, etc. The occurrence of this phenomenon seriously affects the normal production of the oil field and the overall economic benefits of ASP flooding

Method used

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  • Anti-scaling agent for oil well silicate scale
  • Anti-scaling agent for oil well silicate scale
  • Anti-scaling agent for oil well silicate scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1. Determination of corrosion rate of anti-scaling agent: Measure the size of a standard N80 steel sheet with a vernier caliper and calculate the surface area. Wipe it with absorbent cotton, wash it with absolute ethanol, soak and dehydrate it for 5 minutes, take out the test piece and immediately dry it with filter paper, blow it dry with a cold fan, put it in a desiccator for 30 minutes, and weigh it to the nearest 0.0001g. Fix and immerse the test piece in a 500mL jar filled with 500mg / L antiscalant solution, and place the jar in a constant temperature water bath at 45°C for 7 days. Take out the test piece, rinse it with clean water first, then gently brush it with a brush, then blot it dry with filter paper and soak it in absolute ethanol for 5 minutes, take out the test piece and immediately dry it with filter paper, blow it dry with a cold fan, and put it in a dry place. After 15 minutes in the container, it is weighed to an accuracy of 0.0001g, and the co...

Embodiment 2

[0032] Embodiment 2, the antiscaling rate measurement of antiscaling agent: add each antiscaling agent in the wide mouth bottle that Daqing salt water is housed respectively, then add magnesium chloride solution, calcium chloride solution in each bottle, shake well and then Add sodium silicate solution, so that the concentrations of various substances in the solution are: anti-scaling agent 100mg / L, Ca 2+ 200mg / L, Mg 2+ 65mg / L, Si 4+ 500mg / L. Close the cork tightly, mix the solution, place the solution in the bottle in a constant temperature water bath at 45°C for 24 hours, take it out and test the concentration of silicon ions in the solution with an atomic absorption spectrophotometer, the anti-scaling rate E is calculated according to the following formula, the experimental results See Table 2.

[0033]

[0034] In the formula: E-anti-fouling rate;

[0035] C 2 - the concentration of silicon ions in the mixed solution after adding the antiscalant;

[0036] C 1 -Co...

Embodiment 3

[0044] Example 3. On-site anti-scaling effect test of the anti-scaling agent SY-KD of the present invention in ternary oil wells: Well South 5-10-P32 in the South 5 Block of Daqing Oilfield, in January, February and March 2008, the pump was stuck three times in a row due to scaling During the operation, the rods and pipes were seriously fouled, and the thickness of the scale layer was about 1mm. The average pump inspection cycle was only 21 days, and the well had already entered the fouling period. Take the scale samples of rods and tubes and other parts for indoor analysis, the average content of silicate scale is 63.6%, and the average content of carbonate scale is 31.8%.

[0045] On March 24, 2008, anti-scaling agent SY-KD was used in South 5-10-P32 well for anti-scaling dosing. Scale agent SY-KD is continuously added into the wellbore from the oil casing annulus to form a stable concentration in the production fluid medium to prevent silicate scaling. Anti-scaling agent S...

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Abstract

The invention discloses an anti-scaling agent for oil well silicate scale. The anti-scaling agent is prepared by compounding a component A, a component B and water according to the mass ratio of 1:1:2, wherein the component A represents random terpolymer the side-chain of which has carboxylic acid, sulfonic acid and carboxylic acid ester functional groups, and the component B represents phosphinocarboxylic acid compound containing a phosphoric acid group-PO(OH)2 and a carboxylic acid group-COOH. The invention is applied to the scaling prevention of a strong base ASP flooding block productionwell, efficiently prevents the silicate from scaling at a pump, a bar pipe and the like, reduces the frequency of operation because of scaling and prolongs the pump inspection period of the production well.

Description

Technical field: [0001] The invention relates to an anti-scaling agent in the field of oil recovery, in particular to an anti-scaling agent used for silicate scale in three-element compound oil flooding wells. Background technique: [0002] At present, the ASP flooding technology is an important means to further enhance the oil recovery in the late stage of high water cut in Daqing Oilfield. With the injection of the ternary system, the phenomenon of silicate scaling in production wells is becoming more and more serious. The anti-scaling rate of ordinary anti-scaling agents on silicate scale is very low, and continuous scaling will lead to pump stuck, broken rods, etc. The occurrence of this phenomenon seriously affects the normal production of the oil field and the overall economic benefits of ASP flooding. Invention content: [0003] In order to overcome the deficiencies in the background technology, the invention provides a silicate scale antiscaling agent for oil well...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/528
Inventor 王贤君王鑫王庆国管公帅傅海荣
Owner PETROCHINA CO LTD
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