Development of wellbore compound blockage removal technology to reduce production loss in the ultra-deep and high-sulfur
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ORIGINAL PAPER-PRODUCTION ENGINEERING
Development of wellbore compound blockage removal technology to reduce production loss in the ultra‑deep and high‑sulfur Yuanba gas field Wei Luo1 · Qiang Wu2 Received: 3 June 2020 / Accepted: 3 September 2020 / Published online: 15 September 2020 © The Author(s) 2020
Abstract Wellbore compound blockage occurs in several wells of Yuanba gas field during production, which seriously affects the stable production. The prior treatment with inorganic acid injection does not show a good effect. Therefore, it is urgent to establish an effective blockage removal technology. In this work, the composition analysis of compound blockage samples is firstly carried out. Then, two types of acid solution and barite dissolvent for different types of wellbore blockage are developed. Finally, the corresponding crafts of wellbore blockage removal for different degrees of wellbore blockage are set up. Analysis results show that the inorganic components of blockages are mainly FeS2, CaCO3, BaSO4, and S iO2. The organic components of blockages are mainly the decomposition products of macromolecular materials and the asphaltene. There are differences in the components of blockages between different wells in Yuanba gas field. Some wells are the type of organic-based blockage, while others are the type of inorganic-based blockage. The field application shows that the developed wellbore compound blockage removal technology has successfully guided the in situ removal operation of eight wells in Yuanba gas field, ensuring the smooth completion of production task of this gas field. This effective blockage removal technology can be extended to similar ultra-deep and high-sulfur gas field. Keywords Yuanba gas field · Wellbore compound blockage · Composition analysis · Acid solution · Removal technology
Introduction Yuanba gas field is a large marine gas field with 100 billion cubic meters reserves in Sichuan basin discovered by Sinopec after Puguang gas field. It is located in the southwest of Bazhong block in the northeast of Sichuan Province. Yuanba gas field is characterized by ultra-deep (6500 m +), high temperature (150 °C), high pressure (70 MPa), and high sulfur content (5%), which is a typical “three highs” gas reservoir (Dou et al. 2012; Aldawsari et al. 2017; Liu et al. 2015). Meanwhile, Yuanba gas field is a low-porosity and low-permeability reservoir with the porosity of 4.53% and the permeability of 0.34md. Yuanba gas field has built an * Wei Luo [email protected] 1
Nanchong Vocational and Technical College, Nanchong 637131, China
Research Institute for Engineering Technology, Sinopec Southwest Branch Company, Deyang 618000, China
2
annual capacity of 3.4 billion cubic meters since it was officially put into production in December 2014 (Guo 2019; Ma et al. 2014; Guo et al. 2018). However, a series of problems occurs along with the production, the most serious of which is the wellbore compound blockage. In order to release the reservoir productivity as much as possible, 76 percent
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