Advanced Water Injection for Low Permeability Reservoirs. by Ran Xinquan

By Ran Xinquan

Concise and readable, Water Injection For Low Permeability Reservoirs offers operators with the right kind workflow platforms and engineering recommendations for designing, making plans and enforcing  water injection platforms that may enhance restoration components. whilst utilized in low permeability or ultra-low permeability reservoirs, water injection is likely one of the inexpensive tools for making sure greatest construction charges. This booklet offers either theoretical research and functional circumstances for designing and comparing water injection structures and figuring out key construction variables interested by making exact predictions for oil and water generating premiums, water injection premiums, and restoration efficiency.

This ebook basically explains the features of ultra-low permeability reservoirs and linear movement theories. those subject matters are then utilized to layout and implementation. software instances of 4 oilfields are integrated to aid increase ideas whereas illustrating the correct workflow for making sure waterflooding functionality research and optimization. The booklet can be utilized as a reference for box technical body of workers, or as technical aid for the administration personnel.

  • Discusses features of low and ultra-low permeability reservoirs and linear circulate theories
  • Provides designated examinations of features resembling pressure sensitivity, fracturing timing, and nonlinear movement theory
  • Describes layout and implementation of complex waterflooding systems
  • Includes actual case reviews from 4 oilfields

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Extra resources for Advanced Water Injection for Low Permeability Reservoirs. Theory and Practice

Example text

Our water-displaced oil experiments under different displacing pressures show that when the displacing pressure gradient is enhanced, oil in thinner pores can be forced out, with a rise of the displacement efficiency (Fig. 1-32). In addition, as has been discussed, advanced water injection can effectively increase the swept volume and enhance oil recovery. 06 (MPa) FIGURE 1-32 Curves of displacing pressure and efficiency in Ansai. Our numerical modeling shows that advanced injection can increase the recovery efficiency by 3%B5%.

7 Slowing Down Output Decline The key to the development of ultralow-permeability oilfields is to enhance the per-well output and extend the duration of stabilized output so as to improve their economic conditions. The basin-wide application of advanced injection in Ordos succeeded in reducing the decline of the initial output. Take the Baima block of the Xifeng Oilfield, for example. 0%. 2% in the first four years. Another case is from the advanced-flooded blocks in Wuliwan and Dalugou of the Jing’an Oilfield.

The slightly upward OA segment in the curve shows that under confining pressure, the cement structure experiences a strain and is deformed, with the spaces among the grains shrinking, thus narrowing the pore throats. The deformation of this segment has the feature of soft plastic deformation, which means the compacted and deformed cement may not be recovered to its original state even when the confining pressure is restored. The gradient that is reflected in the curves of confining pressure and permeability and the curves of confining pressure and circulation permeability indicate high rates of permeability decline and low permeability recovery rates even after the confining pressure is released.

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