一种循环封窜方法技术

技术编号:22591948 阅读:62 留言:0更新日期:2019-11-20 09:43
本发明专利技术涉及一种循环封窜方法。该循环封窜方法包括以下步骤:(1)在套管内下入封窜管柱和插管桥塞,使插管桥塞对应窜槽井段,先不坐封插管桥塞;(2)向封窜管柱内注入暂堵剂,使暂堵剂进入窜槽井段,挤压暂堵剂使之进入窜槽上下两端的油层中;(3)坐封插管桥塞;(4)注入封窜剂,使封窜剂进入窜槽;(5)上提封窜管柱至上部油层的上方,循环洗井将多余的封窜剂洗出;(6)继续上提封窜管柱,关井候凝。注入封窜剂之前,先注入暂堵剂,提高窜槽上下两端油层的吸水启动压力,这样,在循环封窜时,封窜剂将不再进入窜槽上下两端的油层中或者进入量很少,因此能够对窜槽两端的油层进行保护,避免对油层造成严重污染。

A circulation sealing method

The invention relates to a circulating channeling sealing method. The circulation sealing method includes the following steps: (1) the sealing channeling string and the intubation bridge plug are put into the casing to make the intubation bridge plug correspond to the channeling well section, and the intubation bridge plug is not set first; (2) the temporary plugging agent is injected into the sealing channeling string to make the temporary plugging agent enter the channeling well section, and the temporary plugging agent is squeezed to make it enter the reservoir at the upper and lower ends of the channeling; (3) the intubation bridge plug is set; (4) the sealing channeling agent is injected, Make the sealing channeling agent enter the channeling channel; (5) lift up the sealing channeling string to the top of the upper oil layer, and wash out the excess sealing channeling agent by circulating well flushing; (6) continue to lift up the sealing channeling string, and shut in the well for setting. Before the injection of channeling sealing agent, the temporary plugging agent shall be injected first to improve the water absorption starting pressure of the upper and lower oil layers of the channeling groove. In this way, during the circulation of channeling sealing, the channeling sealing agent will no longer enter the upper and lower oil layers of the channeling groove or the amount of entry is very small, so the oil layers at both ends of the channeling groove can be protected to avoid serious pollution to the oil layer.

【技术实现步骤摘要】
一种循环封窜方法
本专利技术涉及油水井套管外窜槽封窜
,具体涉及一种循环封窜方法。
技术介绍
在油田开发中后期,由于固井质量差以及射孔冲击、地应力变化、压裂酸化等因素的影响,导致许多油水井套管出现破漏,管外窜槽现象逐年加剧,无法有效进行分层配注,开发成本增加,采收率降低,严重制约着油田开发。现有的封窜技术主要包括套管内循环封窜技术、套管内循环挤注封窜技术以及套管内封隔器挤注封窜技术,在上下地层都射开时,这些封窜方法因窜槽两侧压力平衡,封窜剂无法有效进行窜槽,封窜效果不理想。近几年又提出了套管外正循环封窜技术,虽然提高了封窜效果,但在已射孔油层启动压力低、吸水能力好时油层受封窜剂污染较为严重,封窜剂大量进入已射孔油层中,导致油层堵塞较深,重新射孔后油井产量大幅下降甚至不出液。
技术实现思路
本专利技术的目的在于提供一种循环封窜方法,以解决现有套管外正循环封窜技术在使用时封窜剂容易对启动压力低、吸水能力好的已射孔油层造成严重污染的问题。为实现上述目的,本专利技术循环封窜方法的技术方案是:循环封窜方法包括以下本文档来自技高网...

【技术保护点】
1.一种循环封窜方法,其特征是,包括以下步骤:/n(1)在套管内按设计深度下入封窜管柱和插管桥塞,使插管桥塞对应窜槽井段,先不坐封插管桥塞;/n(2)向封窜管柱内注入暂堵剂,使暂堵剂进入窜槽井段,挤压暂堵剂使之进入窜槽上下两端的油层中;/n(3)坐封插管桥塞,将窜槽上下两端的油层隔开;/n(4)注入封窜剂,使封窜剂进入窜槽;/n(5)上提封窜管柱至上部油层的上方,循环洗井将多余的封窜剂洗出;/n(6)继续上提封窜管柱,关井候凝。/n

【技术特征摘要】
1.一种循环封窜方法,其特征是,包括以下步骤:
(1)在套管内按设计深度下入封窜管柱和插管桥塞,使插管桥塞对应窜槽井段,先不坐封插管桥塞;
(2)向封窜管柱内注入暂堵剂,使暂堵剂进入窜槽井段,挤压暂堵剂使之进入窜槽上下两端的油层中;
(3)坐封插管桥塞,将窜槽上下两端的油层隔开;
(4)注入封窜剂,使封窜剂进入窜槽;
(5)上提封窜管柱至上部油层的上方,循环洗井将多余的封窜剂洗出;
(6)继续上提封窜管柱,关井候凝。


2.根据权利要求1所述的循环封窜方法,其特征是,注...

【专利技术属性】
技术研发人员:秦世群宋保建马宏伟代吉建连贵军林波陈旭波吴娜娜
申请(专利权)人:中国石油化工股份有限公司中国石油化工股份有限公司河南油田分公司采油一厂
类型:发明
国别省市:北京;11

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