Search

Copyright of Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Yong'an block of Shengli Oilfield is a typical small complex fault block oil reservoir. In order to explore the potential of this kind of reservoir further, a cross-block ladder horizontal well is used on the basis of recognizing faults, and the remaining oil in different faults is produced by one well. By this method, the recovery is improved and the drilling cost is decreased. The paper analyzes the reservoir characteristics of Yong'an block and illustrates the difficulties for drilling and completion of this well, on the basis of which it introduces the drilling and completion techniques of the first cross-block ladder horizontal well of Shengli Oilfield, Well Y3p9. Geosteering technique and seismic cross section are combined to determine the fault location and to accurately control the well trajectory to pass through faults and dig into another oil layer. Drilling and completion integrated technique and plastic micro-expansion slurry are taken to greatly increase the cementing quality of ladder horizontal wells. This well has been successfully drilled and produced, which proves the cross-block ladder horizontal well can improve the recovery ratio of fault block reservoir, and has promotional value. [ABSTRACT FROM AUTHOR]

Honghe oilfield has the characteristics of low porosity, ultra-low permeability and natural fracture growth. Open-hole packer staged fracturing technology was mainly conducted in the early development stage, which is subjected to complex process of drilling sweep ball seat and difficult construction of secondary reformation. Through salvage sliding sleeve fracturing process test, the shaft diameter can be realized in whole wellbore, which provides technical support for the secondary transformation and interference factors analysis. The tube-string structure, technique characteristics and operation process of salvage tools were introduced in this paper, and pilot test was carried out in Well HH37P32. Field application shows that this fracturing technology can effectively implement stimulation for horizontal wells, and improve the fracturing effect of low permeability reservoir. [ABSTRACT FROM AUTHOR]

Compared with vertical wells, horizontal well fishing operations are more difficult, high cost and taking the risk of well abandoned. For this case, high-intensity dropping control unit for horizontal wells in ultra-low permeability reservoirs was developed, which is specific suitable for horizontal well structure. The device structure, technique principle and technical features of this unit were introduced in this paper, and then the anchoring strength was theoretical calculated and performance index was studied in lab tests. Theoretical calculation and repeated laboratory and field tests show that the device has a good adaptability to the downhole and anchor effect, which can basically meet the production requirement of horizontal wells in ultra-low permeability reservoirs. The device has a feasible principle, logical structure, reliable performance and could be widely applied. [ABSTRACT FROM AUTHOR]