CN112360393A - 一种提高钻井废弃泥浆调剖有效性的调剖工艺 - Google Patents
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Abstract
本发明公开了一种提高钻井废弃泥浆调剖有效性的调剖工艺,包含步骤:步骤S1、从钻井现场回收的废弃泥浆,在废弃泥浆中加入添加剂;步骤S2、在目的调剖水井中注入0.5%的聚合物溶液20m3;步骤S3、注入高强度有机冻胶500m3,在允许压力条件下最大排量注入,控制施工压力为地面井口承压和地层破裂压力两者取小值的80%,所述的高强度有机冻胶为0.5%聚合物、0.4%有机铬交联剂、0.2%助剂、其余为地层污水等。整个调剖工艺以封堵水驱大孔道为目的,以泥浆调剖剂的固相沉淀封堵性为主,有机冻胶的作用是控制调整泥浆调剖剂的流向,隔离聚合物段塞作用为井下增稠提高封堵效果。对比单一冻胶体系或泥浆体系,具有明显的降本和增效优势,能显著提高油田开发的效益。
Description
技术领域
本发明属于油田采油技术领域,尤其涉及一种提高钻井废弃泥浆调剖有效性的调剖工艺。
背景技术
一般油田经过多轮次调剖,化学调剖剂用量越来越大,调剖成本也随之增加。从油田需求出发,以降低调剖成本和减少钻井废弃泥浆处理费用为目的,以钻井废弃泥浆为调剖剂能极大的降低油田开发成本,经过处理和配方调整的钻井废弃泥浆具有与传统固含沉淀类调剖剂相近的性能,起到水井调剖作用。以钻井废弃泥浆配制调剖剂的应用在业内较为常见,但基于固相沉淀类调剖剂的调剖原理,该体系理论上并不适宜大剂量的注入,现有的钻井废弃泥浆调剖技术,为了实现大剂量注入,废弃泥浆配制的调剖剂通常具有较好的悬浮性和较长的沉淀固化时间,致使泥浆调剖剂具有较好流动性,带来的问题是,应用泥浆调剖的井组,调剖泥浆在油井端被采出导致调剖失效的情况较为突出。
发明内容
本发明主要是解决现有技术所存在的技术问题,从而提供一种提高钻井废弃泥浆调剖有效性的调剖工艺。
本发明的上述技术问题主要是通过下述技术方案得以解决的:
一种提高钻井废弃泥浆调剖有效性的调剖工艺,包含步骤:
步骤S1、从钻井现场回收的废弃泥浆,在废弃泥浆中加入添加剂,所述的添加剂为0.2%CMC、0.3%油酸钠、钻井液固相:水泥=1:2、1.0%CaO、0.2%丙烯酰胺衍生物,配制完成后进行持续搅拌直至注入井内;
步骤S2、在目的调剖水井中注入0.5%的聚合物溶液,所述的聚合物为分子量2500万的阴离子聚丙烯酰胺;
步骤S3、注入高强度有机冻胶,在允许压力条件下最大排量注入,控制施工压力为地面井口承压和地层破裂压力两者取小值的80%,所述的高强度有机冻胶为0.5%聚合物、0.4%有机铬交联剂、0.2%助剂、其余为地层污水;
步骤S4、注入隔离段塞聚合物溶液;
步骤S5、注入钻井废弃泥浆配制的调剖剂,注入压力需小于前期注高强度有机冻胶3MPa以上,注入过程中,每500m3泥浆调剖剂之间注入0.5%聚合物溶液100m3;
步骤S6、注入中等强度有机冻胶,注入压力控制不超过注泥浆调剖剂的最高压力,所述的中等强度有机冻胶为0.4%聚合物、0.3%有机铬交联剂、0.2%助剂、其余为地层污水;
步骤S7、注入清水,将调剖段塞推出近井,不致阻塞注水通道;
步骤S8、关井7天;
步骤S9、恢复注水。
本发明的提高钻井废弃泥浆调剖有效性的调剖工艺具有以下优点:前置高强度有机冻胶流动性差,通过较小的剂量实现局部封堵,对优势大孔道的预处理能起到一定的封堵限流功能,防止泥浆调剖剂在大孔道中的指进;隔离段塞作用是防止泥浆调剖剂与冻胶之间的性能干扰,同时起到增稠作用,增强泥浆调剖剂中已沉降固相组分的滞留性,避免其过度流动;后置中等强度有机冻胶作用是在注入井近井地带形成封口屏障,不致泥浆返流。整个调剖工艺以封堵水驱大孔道为目的,以泥浆调剖剂的固相沉淀封堵性为主,有机冻胶的作用是控制调整泥浆调剖剂的流向,隔离聚合物段塞作用为井下增稠提高封堵效果。对比单一冻胶体系或泥浆体系,具有明显的降本和增效优势,能显著提高油田开发的效益。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本发明的提高钻井废弃泥浆调剖有效性的调剖工艺的工艺流程图。
具体实施方式
下面结合附图对本发明的优选实施例进行详细阐述,以使本发明的优点和特征能更易于被本领域技术人员理解,从而对本发明的保护范围做出更为清楚明确的界定。
本发明提供一种提高钻井废弃泥浆调剖有效性的调剖工艺,在苏北ZC油田实施,其工艺实施步骤如下:
(1)、从钻井现场回收的废弃泥浆,技术参数如下:废弃泥浆密度为1.12g/cm3,其中的固相含量为15.04%,粒径中值10μm,含水率为76.67%,含油率为8.29%。按照图1所示,在废弃泥浆中加入添加剂进行性能调整,添加剂配方0.2%CMC、0.3%油酸钠、钻井液固相:水泥=1:2、1.0%CaO、0.2%丙烯酰胺衍生物,配制完成后进行持续搅拌直至注入井内;
(2)、在目的调剖水井中注入0.5%的聚合物溶液20m3,聚合物为分子量2500万的阴离子聚丙烯酰胺,该段塞目的是考察地层对一定粘度液体的注入性,为后续注入调剖剂提供施工参数的预判;
(3)、注入高强度有机冻胶500m3,在允许压力条件下最大排量注入,控制施工压力为地面井口承压和地层破裂压力两者取小值的80%,有机冻胶配方为0.5%聚合物、0.4%有机铬交联剂、0.2%助剂、其余为地层污水,该前置段塞的目的是以较大的注入速度,将冻胶外推、预处理水驱优势大孔道,为泥浆调剖剂段塞提供波及前缘的限流屏障,控制流向,避免泥浆调剖剂指进;
(4)、注入隔离段塞聚合物溶液20m3,作用是隔离有机冻胶与泥浆调剖剂,避免泥浆调剖剂中的固相组分在井筒或炮眼处接触高强冻胶形成胶结沉淀;
(5)、注入钻井废弃泥浆配制的调剖剂6600m3,注入压力需小于前期注高强度有机冻胶3MPa以上,注入过程中,每500m3泥浆调剖剂之间注入0.5%聚合物溶液100m3,控制施工压力是为了避免泥浆调剖剂突破前置冻胶,期间设计的聚合物溶液,目的是对注入地层的泥浆调剖剂进行增稠,巩固沉降,提高封堵能力;
(6)、注入中等强度有机冻胶500m3,注入压力控制不超过注泥浆调剖剂的最高压力,冻胶配方为0.4%聚合物、0.3%有机铬交联剂、0.2%助剂、其余为地层污水,该段塞作用是形成后置屏障阻止泥浆调剖剂返流;
(7)、注入清水50m3,将调剖段塞推出近井,不致阻塞注水通道;
(8)、关井7天;
(9)、恢复注水;
从矿场应用情况看,按照本发明的泥浆调剖工艺进行调剖后,注水压力上升了4.5MPa,吸水剖面显著改善,对应油井未出现产出泥浆的情况。施工过程中再利用废弃泥浆6600m3,对比聚合物冻胶调剖体系,每方堵剂成本220元降至68元,节约成本支出100.32万元。
不局限于此,任何不经过创造性劳动想到的变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应该以权利要求书所限定的保护范围为准。
Claims (1)
1.一种提高钻井废弃泥浆调剖有效性的调剖工艺,包含步骤:
步骤S1、从钻井现场回收的废弃泥浆,在废弃泥浆中加入添加剂,所述的添加剂为0.2%CMC、0.3%油酸钠、钻井液固相:水泥=1:2、1.0%CaO、0.2%丙烯酰胺衍生物,配制完成后进行持续搅拌直至注入井内;
步骤S2、在目的调剖水井中注入0.5%的聚合物溶液,所述的聚合物为分子量2500万的阴离子聚丙烯酰胺;
步骤S3、注入高强度有机冻胶,在允许压力条件下最大排量注入,控制施工压力为地面井口承压和地层破裂压力两者取小值的80%,所述的高强度有机冻胶为0.5%聚合物、0.4%有机铬交联剂、0.2%助剂、其余为地层污水;
步骤S4、注入隔离段塞聚合物溶液;
步骤S5、注入钻井废弃泥浆配制的调剖剂,注入压力需小于前期注高强度有机冻胶3MPa以上,注入过程中,每500m3泥浆调剖剂之间注入0.5%聚合物溶液100m3;
步骤S6、注入中等强度有机冻胶,注入压力控制不超过注泥浆调剖剂的最高压力,所述的中等强度有机冻胶为0.4%聚合物、0.3%有机铬交联剂、0.2%助剂、其余为地层污水;
步骤S7、注入清水,将调剖段塞推出近井,不致阻塞注水通道;
步骤S8、关井7天;
步骤S9、恢复注水。
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