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| Scaling Mechanism and Prevention Measures of Gathering and Transportation System in an Operation Area of Changqing Oilfield |
| Received:March 20, 2019 Revised:July 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.07.017 |
| KeyWord:scaling mechanism compatibility scale inhibitor |
| Author | Institution |
| CHENG Jie |
1. Xi'an Changqing Technology Engineering Co., Ltd, Xi'an , China |
| ZHANG Xiao-long |
1. Xi'an Changqing Technology Engineering Co., Ltd, Xi'an , China |
| CUI Xi |
1. Xi'an Changqing Technology Engineering Co., Ltd, Xi'an , China |
| LI Zi-li |
2. Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, China University of Petroleum East China, Qingdao , China |
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| Abstract: |
| Objective To solve the scaling problem of the gathering and transportation system in an operation area of Changqing Oilfield. Methods The physical and chemical properties of the water sample were tested and analyzed with instruments such as ion chromatography; the X-ray diffraction instrument was used to analyze the composition of the on-site scale samples; the compatibility between two kinds of oil well produced liquid was studied by indoor static scaling experiment combined with titration method; and also, the scaling inhibitors were filtered and evaluated. Results The main reason for the scaling of the gathering and transportation system in an operation area of Changqing Oilfield was that the produced liquid of C6 and Y9 layers in this area was incompatible. The main reason was strontium and barium scaling. And the amount of scaling was large. The temperature had little effect on the total scale amount; however, as the proportion of the two water samples was close to 1:1, the scaling amount reached the maximum. When C scale inhibitor was added and the concentration was 90 mg/L, the scale inhibition rate could reach 86.1%, which was about 30% higher than that of the original scheme. The maximum scale formation amount could be reduced from 1678 mg/L to 233 mg/L after scale inhibition. Conclusion The C scale inhibitor supplied at site is applicable to the gathering and transportation system in an operation area of Changqing Oilfield. It has high scale inhibition rate, and can effectively slow down the scaling problem in the field. |
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