张龙胜,王维恒. 双壳型覆膜支撑剂DSCP的研制及现场试验[J]. 石油钻探技术,2023, 51(1):91-97. DOI: 10.11911/syztjs.2023014
引用本文: 张龙胜,王维恒. 双壳型覆膜支撑剂DSCP的研制及现场试验[J]. 石油钻探技术,2023, 51(1):91-97. DOI: 10.11911/syztjs.2023014
ZHANG Longsheng, WANG Weiheng. Preparation and field test of double-shell coated proppant(DSCP) [J]. Petroleum Drilling Techniques,2023, 51(1):91-97. DOI: 10.11911/syztjs.2023014
Citation: ZHANG Longsheng, WANG Weiheng. Preparation and field test of double-shell coated proppant(DSCP) [J]. Petroleum Drilling Techniques,2023, 51(1):91-97. DOI: 10.11911/syztjs.2023014

双壳型覆膜支撑剂DSCP的研制及现场试验

Preparation and Field Test of Double-Shell Coated Proppant (DSCP)

  • 摘要: 压裂深层页岩气井时,要求所用支撑剂具有良好的抗压强度和导流能力。为了寻找一种抗压强度高、导流能力好且价格适中的适用于高闭合压力油气井压裂的支撑剂,以酚醛树脂、多元醇聚合物和固化剂等为原材料,采用物理表面涂覆和化学改性相结合的方法,按照一定质量比制备了双壳型覆膜支撑剂DSCP。DSCP内壳的主要成分为酚醛树脂,用于提高抗压强度;外壳的主要成分是惰性合成树脂,在进一步提高抗压强度的同时,提高支撑剂的导流能力。室内评价了DSCP的抗压强度、导流能力等性能,结果为,DSCP在压力69和86 MPa下的破碎率分别为1.21%和2.35%,在温度90 ℃、压力90 MPa下的导流能力为3.12 mD·cm,表明其具有良好的抗压强度和导流能力。现场试验表明,相较于使用陶粒压裂的水平井,在达到相同压裂规模和相当工艺参数的前提下,使用DSCP时支撑剂费用降低30%左右。研究结果表明,DSCP能够在高闭合压力井压裂中使用,具有较好的推广应用前景。

     

    Abstract: The fracturing development of deep shale gas wells requires that proppants should have good compressive strength and flow conductivity. Therefore, phenol-formaldehyde resins, polyol polymers, and curing agents were taken as raw materials to prepare the double-shell coated proppant (DSCP) by a certain mass ratio with the combination of physical surface coating and chemical modification methods. The effort was to find a proppant with high compressive strength, good flow conductivity, and moderate costs. It could be applied to the fracturing of oil and gas wells with high closure pressure. For the prepared DSCP, its inner shell was mainly made of phenol-formaldehyde resins to enhance the compressive strength, and the outer shell was mainly made of inert synthetic resins to further improve the compressive strength and strengthen the flow conductivity. Laboratory experiments were carried out to evaluate the performance of DSCP, such as compressive strength and flow conductivity. The experimental results indicated that the crushing rates of DSCP at 69 and 86 MPa were 1.21% and 2.35% respectively, its flow conductivity was 3.12 mD•cm at 90 ℃ and 90 MPa. In other words, DSCP had good compressive strength and flow conductivity. Field tests showed that compared with the case of horizontal wells fractured with ceramisite, the cost of proppants could be reduced by about 30% on the premise of the same fracturing scale and technical parameters. The research result suggests that DSCP can be applied to the fracturing of wells with high closure pressure and has good prospects of popularization and application.

     

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