Volume 40 Issue 6
Dec.  2023
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CHEN Ming, LAN Qiang, JIA Jianghong, et al.Preparation and affecting effects of a slow-releasing organic microemulsified acid pipe-freeing agent[J]. Drilling Fluid & Completion Fluid,2023, 40(6):742-748 doi: 10.12358/j.issn.1001-5620.2023.06.007
Citation: CHEN Ming, LAN Qiang, JIA Jianghong, et al.Preparation and affecting effects of a slow-releasing organic microemulsified acid pipe-freeing agent[J]. Drilling Fluid & Completion Fluid,2023, 40(6):742-748 doi: 10.12358/j.issn.1001-5620.2023.06.007

Preparation and Affecting Effects of a Slow-Releasing Organic Microemulsified Acid Pipe-Freeing Agent

doi: 10.12358/j.issn.1001-5620.2023.06.007
  • Received Date: 2023-06-11
  • Rev Recd Date: 2023-07-20
  • Publish Date: 2023-12-30
  • Drilling pipe-freeing agents presently in use have some problems that need to be solved, for example, the reaction rate of the pipe-freeing agents is too high which is easy to result in loss of the spotting fluids into formations and thus failures of the pipe-freeing operation. A slow-releasing organic microemulsified acid pipe-freeing agent has been developed to deal with this problem. Surfactants and acids were carefully selected to prepare the pipe-freeing agent. The optimized composition of the pipe-freeing agent is as follows: AQAS∶NP = 2∶1, n-butanol∶n-octanol = 1∶1, water phase ∶oil phase = 23∶77, secondary surfactant∶primary surfactant = 1∶3, and acetic acid∶hydrogen fluoric acid = 3∶1. The pipe-freeing agent is a water-in-oil (W/O) microemulsified acid, and the embedding rate of this pipe-freeing agent is 23%. Formation factors remarkably affecting the performance of the pipe-freeing agent is temperature. At high pressure high temperature, the release rate of the acid is increasing. Drilling fluid factors greatly affecting the performance of the pipe-freeing agent include weighting agent, clay and ultra-fine calcium carbonate. The microemulsified acid can completely lose its emulsion stability and turn into a suspension by the weighting agent, clay and ultra-fine calcium carbonate used in the drilling fluid. Field application of this pipe-freeing agent on five wells has shown that it can be used to free stuck pipes of many types such as pressure-differential pipe sticking, pipe sticking by settling drilled cuttings and bridging etc., and the success rate of first try in freeing the stuck pipes is 100%.

     

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