A Compound Acid for Medium to High Water-cut Screen Pipe Completed Wells in Wenchang Oilfield
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摘要: 南海西部文昌油田群部分油井已进入中高含水期，储层具有胶结疏松、非均质性强等特点，多采用悬挂筛管完井，酸化时很难实现均匀布酸，往往出现增液不增油的现象。针对储层特点及完井方式，研发出了WZX-02自转向酸+WHS-05缓速酸的复合酸液体系，该体系能有效抑制酸液进入高渗层，避免酸化后含水大幅上升。该体系在文昌M油田D井进行了先导性试验，酸化前产液量为68 m3/d，产油量为32 m3/d，含水53%，酸化后产液量为207 m3/d，产油量为117 m3/d，含水43%，增产效果显著，可为类似中高含水筛管井酸化提供借鉴。Abstract: Some oil wells in the Wenchang Oilfield (located in the west of South China Sea), which were completed with screen pipe, are now having high water-cut. In acidizing operations, acids are difficult to be distributed evenly, thus the production of fluid is increased, while the production of oil remains low. Based on the characteristics of the reservoir rocks and the well completion method used, a compound acids, formulated with a self-diverting acid WZX-02 and a retarding acid WHS-05, was developed to deal with the said problems. The compound acids are able to control themselves from entering into formations of high permeability, thereby avoiding water-cut increase after acidizing operations. The compound acids have been pilot tested on the Well D in Block M in Wenchang oilfield. Prior to acidizing, the well had liquid production of 68 m3/d, oil production of 32 m3/d, and water-cut of 53%. After acidizing, the liquid production increased to 207 m3/d, oil production to 117 m3/d, and water-cut reduced to 43%, demonstrating that the compound acids had remarkable ability in oil production enhancement, and can be used in acidizing screen pipe completed wells with high water-cut.
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Key words:
- Wenchang oilfield /
- Medium to high water-cut /
- Screen pipe completion /
- Acidizing /
- Self diverting acid
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