Volume 37 Issue 1
Feb.  2020
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LUO Yougang, JU Yafeng, WANG Shangwei, YANG Yixing, JIANG Zhiqiang, WANG Jiaxin. Development and Test of a Nanometer Compound Gel Foam Workover Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 127-132. doi: 10.3969/j.issn.1001-5620.2020.01.021
Citation: LUO Yougang, JU Yafeng, WANG Shangwei, YANG Yixing, JIANG Zhiqiang, WANG Jiaxin. Development and Test of a Nanometer Compound Gel Foam Workover Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 127-132. doi: 10.3969/j.issn.1001-5620.2020.01.021

Development and Test of a Nanometer Compound Gel Foam Workover Fluid

doi: 10.3969/j.issn.1001-5620.2020.01.021
  • Received Date: 2019-10-15
  • Publish Date: 2020-02-28
  • Long time development of horizontal wells have their formation pressure and formation energy are gradually depleted because of the physical properties of the reservoirs and the difficulties setting up the injection-production displacement system. Depletion of reservoir pressure often results in severe mud losses during workover operations and reestablishment of circulation is generally quite difficult. These in turn result in long operation time and low operation efficiency. Based on the properties of foam fluid, a highly stable nanometer compound gel foam workover fluid has been developed to deal with this problem. Compared with conventional workover fluids formulated with active water, this foam workover fluid has higher stability, lower density and better capacity in preventing mud losses. The composition of the foam is as follows: 1.4% foaming agent + 0.25% nanometer SiO2 + 0.5% polymer + 0.05% crosslinking agent + 0.02% stabilizer. This workover fluid uses micro foams as dispersed phase and gel as foam stabilizer, the loss of this workover fluid can be minimized by its strong retaining capacity and the combined ability of mud loss control of foam and gel which can help temporarily bridge the channels in the formations through which the workover fluid is lost. In laboratory simulation test, the initial fluid loss of the foam workover fluid through artificial cores was almost zero and the stable rate of loss was less than 10 mL/min, showing itself good pressure-bearing capacity and excellent performance of minimizing mud loss rate. Field test of the workover fluid showed that it had stable properties and was able to temporarily plug the loss zones. This study shows that the nanometer compound gel workover fluid has excellent temporary plugging capacity and ability of minimizing mud losses, it will find wide application in low-pressure horizontal well workover operations.

     

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