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| Mechanism of Scaling and Prevention Measures in Qu-di Oilfield |
| Revised:August 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.08.003 |
| KeyWord:Qu-di oilfiled fouling mechanism compatibility scale inhibitor |
| Author | Institution |
| SUN Zhe |
Sheng-li Oilfield Lu-ming Petroleum Exploration and Production Co., Ltd, Dongying , China |
| ZHAO Xing-guo |
Sheng-li Oilfield Lu-ming Petroleum Exploration and Production Co., Ltd, Dongying , China |
| LI Zi-shou |
Sheng-li Oilfield Lu-ming Petroleum Exploration and Production Co., Ltd, Dongying , China |
| ZHAO Hong-tao |
Sheng-li Oilfield Lu-ming Petroleum Exploration and Production Co., Ltd, Dongying , China |
| YUAN Xiao-liang |
Sheng-li Oilfield Lu-ming Petroleum Exploration and Production Co., Ltd, Dongying , China |
| CUI Jing |
Sheng-li Oilfield Lu-ming Petroleum Exploration and Production Co., Ltd, Dongying , China |
| SUN Qi |
Sheng-li Oilfield Lu-ming Petroleum Exploration and Production Co., Ltd, Dongying , China |
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| Abstract: |
| Objective To solve the scaling problem in Qu-di Oilfield. Methods The physical and chemical properties of the water sample were tested and analyzed with a ion chromatography; the X-ray diffraction instrument was used to analyze the composition of the on-site scale samples; through the indoor static scaling experiment combined with the titration method, the compatibility between the production fluid in the oil well and the injection water from the joint station were studied; and also the scaling inhibitors were filtered and evaluated. Results The type of the water samples in the Qu-di Oilfield was CaCl2-type, followed by many fouling cation Mg2+, while the Sr2+ and Ba2+ contents were relatively small. For fouling anions, they mainly contained HCO3?, while CO32? and SO42? were less abundant. The fouling in the Qu-di Oilfield was mainly caused by the formation of dolomite crystals accompanied by the reaction of Ca2+, Mg2+, and HCO3?. When the production fluids in different oil wells were mixed at low temperatures, the compatibility was good. With the increase of temperature, the degree of fouling increased, but the fouling rate was less than 5%. Expect the production fluids from the Q10-X16 oil well, the remaining production fluids were incompatible with the injection water from the joint station, and the fouling rate was larger than 10%. The 7# scale inhibitor and concentrations of 50 ppm were regarded as the scale inhibitor for the Qu-di Oilfield. Conclusion The 7# scale inhibitor from survey is applicable to the environment of Qu-di Oilfield. It has a high scale inhibition rate and can effectively reduce the fouling problem in Qu-di Oilfield. |
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