CN110748324A - 一种用于高矿化度油藏储层的复合解堵工艺 - Google Patents
一种用于高矿化度油藏储层的复合解堵工艺 Download PDFInfo
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
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Abstract
本发明涉及一种用于高矿化度油藏储层的复合解堵工艺,首先采用前置清洗剂清洗储层孔隙表面,清除生产产生的有机堵塞物,然后采用防盐解堵剂解除储层盐垢堵塞物,最后用复合除垢剂清除储层无机垢堵塞物。与现有酸化解堵方法相比,本发明采用的复合解堵工艺能够对储层结盐结膏垢堵塞油井进行处理,大幅度提高解堵措施效果,并且成本较低,易于推广。
Description
技术领域
本发明属于石油工业中油井储层解堵增产技术领域,涉及一种用于高矿化度油藏储层复合解堵工艺。
背景技术
江汉盆地属于内陆盐湖盆地,由于受到断层和岩盐两方面的影响,具有独特的地质特点和开采规律。有利的方面是油藏构造陡、油层具有反韵律沉积和亲水特性,注水波及状况好,盐水驱油效率高。不利的方面是地层水矿化度高,油井生产储层和井筒结盐结膏严重,造成油井减产,影响采油生产时率,增加生产成本。目前针对地层结垢堵塞减产,主要采取盐酸、土酸改造储层恢复生产,而针对江汉盆地储层结盐结膏堵塞减产井,采取常规的酸化措施增产效果差,部分井储层结盐结膏严重,影响了原油正常生产。
发明内容
本发明所要解决的技术问题是针对现有技术中存在的上述不足,提供一种用于高矿化度油藏储层的复合解堵工艺,能够有效解决储层结盐结膏等堵塞,大幅度提高储层渗流能力,恢复油井产量,提高原油生产经济效益。
为实现上述目的,本发明采用的技术方案是:
一种用于高矿化度油藏储层的复合解堵工艺,首先采用前置清洗剂清洗储层孔隙表面,清除生产产生的有机堵塞物(胶质、沥青质等),然后采用防盐解堵剂解除储层盐垢堵塞物,最后用复合除垢剂清除储层无机垢堵塞物(碳酸钙、硫酸钙等),具体步骤如下:
第一步、配制储层解堵各阶段用复合解堵液
1)配制前置清洗剂,各组份重量份配比为:10~20份清洗剂,2~5份乙二醇丁醚,100份水;
2)配制防盐解堵剂,各组份重量份配比为:0.3~0.5份阴离子表面活性剂,1~2份粘土防膨剂,0.3~0.5份亚铁***,100份水;
3)配制复合除垢剂,各组份重量百分比为:8~12%HCl,0.5~1%NH4Cl,0.8~1.5%乙二胺四甲叉膦酸钠(EDTMPS),0.3~0.5%聚马来酸酐(HPMA),1~2%粘土防膨剂,1~2%铁离子稳定剂,1~2%缓蚀剂,其余为水;
第二步、注入储层解堵各阶段用复合解堵液
(1)起出井内原泵抽生产管柱,下入光油管冲砂洗井管柱,采用活性水清洗井筒至进出口水质一致,下刮套管柱,对座封点上下20m反复刮削3~5次,采用活性水反洗井至进出口水质一致;
(2)下带封隔器的保套注入管柱,活性水替满井筒;
(3)在油管内正替入前置清洗剂,投球、打压座封封隔器,继续打压,连通油管与储层;
(4)注入防盐解堵剂,再注入复合除垢剂;
(5)采用适量清水顶替井筒内复合除垢剂;
(6)关井反应24~48小时;
(7)控制放喷,下入生产管柱转入正常生产。
按上述方案,所述清洗剂为甲苯或二甲苯。
按上述方案,所述活性水为阴离子表面活性剂的水溶液,质量浓度为0.3~0.5%。
按上述方案,所述阴离子表面活性剂选自十二烷基苯磺酸及其钠盐、油酸铵、油酸钠、硬脂酸铵、硬脂酸钠中的一种。
按上述方案,所述粘土防膨剂为聚环氧氯丙烷-二甲胺。
按上述方案,所述铁离子稳定剂为氨三乙酸或乙二胺四乙酸(EDTA)。
按上述方案,所述缓蚀剂为氧乙基化的烷基酚和烷芳基磺酸盐按质量比1~5:1~2的混合物、Lan-826缓蚀剂、Lan-826缓蚀剂中的一种。
按上述方案,所述防盐解堵剂和复合除垢剂的用量根据储层堵塞程度,并结合有效厚度、有效孔度及处理半径来确定,计算方法如下:
V=πr2hΦ;其中V-处理液挤注量,单位m3,r-油井处理半径,单位m,h-油层有效厚度,单位m,Φ-油层孔隙度,单位%。根据油井结盐实际情况,防盐解堵剂的处理半径为3~5米,根据油井结垢实际情况,除垢剂的处理半径为1-2米。
按上述方案,注入储层解堵各阶段用复合解堵液过程中施工压力低于油井地层破裂压力,施工排量300~500L/min。
高矿化度油藏油井生产中结盐、结垢(碳酸钙)、结膏(硫酸钙)堵塞严重,导致油井减产甚至停产,本发明的复合解堵工艺充分考虑储层生产伤害各种因素,针对高矿化度油藏储层有机堵塞、盐垢堵塞和碳酸钙、硫酸钙堵塞,采用前置清洗剂溶解有机堵塞物(胶质、沥青质等),用优选的防盐解堵剂分散增加盐的溶解度,改变盐的结构类型,使储层盐由致密的立方体结构变为疏松、细碎的絮状结构,使之容易溶解、被流体带走;本发明的复合除垢剂中盐酸与碳酸钙反应生成二氧化碳、氯化钙和水,乙二胺四甲叉膦酸钠和聚马来酸酐的作用主要在于螯合分散硫酸钙,乙二胺四甲叉膦酸钠在水溶液中能离解成多个正负离子,与钙离子螯合,使钙垢正常结晶被破坏,聚马来酸酐分散硫酸钙,使硫酸钙晶格扭曲,有助于形成稳定的钙离子螯合物,乙二胺四甲叉膦酸钠和聚马来酸酐合用使硫酸钙能够溶解在水中,起到清除储层无机垢堵塞物的效果。采用上述复合解堵液分阶段解堵工艺提高井筒附近地层渗流能力,提高油井产量。
本发明的有益效果在于:与现有酸化解堵方法相比,本发明采用的复合解堵工艺能够对储层结盐结膏结垢堵塞油井进行处理,大幅度提高解堵措施效果,提高油井产量,具有显著的经济效益,并且成本较低,实用性强,易于推广。
具体实施方式
为使本领域技术人员更好地理解本发明的技术方案,下面结合实施例对本发明作进一步详细描述。显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。
本发明实施例所用储层解堵各阶段用复合解堵液配比如下:
1)配制前置清洗剂,各组份重量份配比为:10~20份清洗剂,2~5份乙二醇丁醚,100份水;
2)配制防盐解堵液,各组份重量份配比为:0.3~0.5份阴离子表面活性剂,1~2份有机季铵盐聚合物,0.3~0.5份亚铁***,100份水;
3)配制复合除垢剂,各组份重量百分比为:12~15%HCl,0.5~1%NH4Cl,0.8~1.5%乙二胺四甲叉膦酸钠(EDTMPS),0.3~0.5%聚马来酸酐(HPMA),1~2%粘土防膨剂,1~2%铁离子稳定剂,1~2%缓蚀剂,其余为水,各组份质量百分比之和为100%。
所用清洗剂为二甲苯;
所用活性水为阴离子表面活性剂的水溶液,质量浓度为0.3%;
所用阴离子表面活性剂为十二烷基苯磺酸;
所用粘土防膨剂为聚环氧氯丙烷-二甲胺;
所用铁离子稳定剂为氨三乙酸;
所用缓蚀剂为氧乙基化的烷基酚和烷芳基磺酸盐按质量比3:2的混合物。
实施例1
油井G-4,生产层段2500-2503m,油井处理半径2m,储层有效厚度3m,孔隙度12%,初期日产液20t,日产油10吨,由于边水推进,该井生产井液氯离子上升至17万毫克每升,生产结盐结膏垢严重,低液低产关停。
采用复合解堵工艺,具体的实施步骤如下:
第一步、配置储层解堵各阶段用复合解堵液
1)配置前置清洗剂,各组份重量份配比为:20份清洗剂,5份乙二醇丁醚,100份水;
2)配置防盐解堵剂,各组份重量份配比为:0.3份阴离子表面活性剂,1份粘土防膨剂,0.5份亚铁***,100份水;
3)配置复合除垢剂,各组份重量百分比为:12%HCl,0.5%NH4Cl,0.8%乙二胺四甲叉膦酸钠(EDTMPS),0.3%聚马来酸酐(HPMA),1%粘土防膨剂,2%铁离子稳定剂,1%缓蚀剂,其余为水,各组份质量百分比之和为100%;
第二步、注入储层解堵各阶段用复合解堵液
(1)起出井内原生产管柱,下冲砂洗井管柱,采用45方活性水清洗井筒至人工井底,至进出口水质一致;
(2)下刮套管柱,对座封点2450m上下20m反复刮削3-5次,采用45方活性水反洗井至进出口水质一致;
(3)下带封隔器的解堵管柱,活性水替满井筒,防止封隔器座封;
(4)在油管内正替入5方前置清洗剂,投球、打压座封封隔器,继续打压打掉球座销钉,连通油管与储层;
(5)注入18方防盐解堵液;
(6)注入5方复合除垢剂;(7)采用清水8方泵注顶替井筒内复合除垢剂;
(8)关井反应24小时;
(9)控制放喷,下入生产管柱转入正常生产。
油井G-4实施复合解堵措施后,日产液15t,日产油5.5t,日增产5.5t,累计增产原油380t。
实施例2
油井W-6,生产层段2000-2005m,储层有效厚度5m,孔隙度15%,初期日产液10吨,日产油8吨,氯离子15万毫克每升,后期生产结盐垢严重,日产液1方,日产油0.3t。
采用复合解堵工艺,具体的实施步骤如下:
第一步、配置储层解堵各阶段用复合解堵液
1)配置前置清洗剂,各组份重量份配比为:20份清洗剂,2份乙二醇丁醚,100份水;
2)配置防盐解堵剂,各组份重量份配比为:0.5份阴离子表面活性剂,1份粘土防膨剂,0.3份亚铁***,100份水;
3)配置复合除垢剂,各组份重量百分比为:8%HCl,1%NH4Cl,1.5%乙二胺四甲叉膦酸钠(EDTMPS),0.5%聚马来酸酐(HPMA),1%粘土防膨剂,2%铁离子稳定剂,1%缓蚀剂,其余为水,各组份质量百分比之和为100%;
第二步、注入储层解堵各阶段用复合解堵液
(1)起出井内原生产管柱,下冲砂洗井管柱,采用40方活性水清洗井筒至人工井底,至进出口水质一致;
(2)下刮套管柱,对座封点1950m上下20m反复刮削3-5次,采用40方活性水反洗井至进出口水质一致;
(3)下带封隔器的解堵管柱,活性水替满井筒,防止封隔器座封;
(4)在油管内正替入9方前置清洗剂,投球、打压座封封隔器,继续打压打掉球座销钉,连通油管与储层;
(5)注入40方防盐解堵液;
(6)注入9方复合除垢剂;
(7)采用适量清水6方顶替井筒内复合除垢剂;
(8)关井反应24小时;
(9)控制放喷,下入生产管柱转入正常生产。
油井W-6实施复合解堵措施后,日产液8t,日产油3.5t,日增产3.2t,累计增产原油270t。
实施例3
油井Z-10,生产层段1292-1300m,储层有效厚度8m,孔隙度18%,生产初期日产液15t,日产油8吨,生产结盐垢严重,目前日产液3方,日产油0.6t。
采用复合解堵工艺,具体的实施步骤如下:
第一步、配置储层解堵各阶段用复合解堵液
1)配置前置清洗剂,各组份重量份配比为:10份清洗剂,5份乙二醇丁醚,100份水;
2)配置防盐解堵剂,各组份重量份配比为:0.3份阴离子表面活性剂,2份粘土防膨剂,0.5份亚铁***,100份水;
3)配置复合除垢剂,各组份重量百分比为:12%HCl,0.5%NH4Cl,0.8%乙二胺四甲叉膦酸钠(EDTMPS),0.3%聚马来酸酐(HPMA),2%粘土防膨剂,1%铁离子稳定剂,2%缓蚀剂,其余为水,各组份质量百分比之和为100%;
第二步、注入储层解堵各阶段用复合解堵液
(1)起出井内原生产管柱,下冲砂洗井管柱,采用30方活性水清洗井筒至人工井底,至进出口水质一致;
(2)下刮套管柱,对座封点1250m上下20m反复刮削3-5次,采用30方活性水反洗井至进出口水质一致;
(3)下带封隔器的解堵管柱,活性水替满井筒,防止封隔器座封;
(4)在油管内正替入20方前置清洗剂,投球、打压座封封隔器,继续打压打掉球座销钉,连通油管与储层;
(5)注入70方防盐解堵液;
(6)注入20方复合除垢剂;
(7)采用适量清水4方顶替井筒内复合除垢剂;
(8)关井反应24小时;
(9)控制放喷,下入生产管柱转入正常生产。
油井Z-10实施复合解堵措施后,日产液12t,日产油4.5t,日增产3.9t,累计增产原油360t。
针对高矿化度油层生产中结盐结垢的技术问题,发明的储层复合解堵工艺,能够有效解决储层结盐结膏等堵塞,提高储层渗流能力,恢复油井产量,提高原油生产效益,目前已经在现场试验8口井,累计增油5000余吨,对高矿化度结盐结垢储层解堵增产具有显著效果。
Claims (9)
1.一种用于高矿化度油藏储层的复合解堵工艺,其特征在于,首先采用前置清洗剂清洗储层孔隙表面,清除生产产生的有机堵塞物,然后采用防盐解堵剂解除储层盐垢堵塞物,最后用复合除垢剂清除储层无机垢堵塞物,具体步骤如下:
第一步、配制储层解堵各阶段用复合解堵液
1)配制前置清洗剂,各组份重量份配比为:10~20份清洗剂,2~5份乙二醇丁醚,100份水;
2)配制防盐解堵剂,各组份重量份配比为:0.3~0.5份阴离子表面活性剂,1~2份粘土防膨剂,0.3~0.5份亚铁***,100份水;
3)配制复合除垢剂,各组份重量百分比为:8~12%HCl,0.5~1%NH4Cl,0.8~1.5%乙二胺四甲叉膦酸钠,0.3~0.5%聚马来酸酐,1~2%粘土防膨剂,1~2%铁离子稳定剂,1~2%缓蚀剂,其余为水;
第二步、注入储层解堵各阶段用复合解堵液
(1)起出井内原泵抽生产管柱,下入光油管冲砂洗井管柱,采用活性水清洗井筒至进出口水质一致,下刮套管柱,对座封点上下20m反复刮削3~5次,采用活性水反洗井至进出口水质一致;
(2)下带封隔器的保套注入管柱,活性水替满井筒;
(3)在油管内正替入前置清洗剂,投球、打压座封封隔器,继续打压,连通油管与储层;
(4)注入防盐解堵剂,再注入复合除垢剂;
(5)采用适量清水顶替井筒内复合除垢剂;
(6)关井反应24~48小时;
(7)控制放喷,下入生产管柱转入正常生产。
2.根据权利要求1所述的用于高矿化度油藏储层的复合解堵工艺,其特征在于,所述清洗剂为甲苯或二甲苯。
3.根据权利要求1所述的用于高矿化度油藏储层的复合解堵工艺,其特征在于,所述活性水为阴离子表面活性剂的水溶液,质量浓度为0.3~0.5%。
4.根据权利要求1所述的用于高矿化度油藏储层的复合解堵工艺,其特征在于,所述阴离子表面活性剂选自十二烷基苯磺酸及其钠盐、油酸铵、油酸钠、硬脂酸铵、硬脂酸钠中的一种。
5.根据权利要求1所述的用于高矿化度油藏储层的复合解堵工艺,其特征在于,所述粘土防膨剂为聚环氧氯丙烷-二甲胺。
6.根据权利要求1所述的用于高矿化度油藏储层的复合解堵工艺,其特征在于,所述铁离子稳定剂为氨三乙酸或乙二胺四乙酸。
7.根据权利要求1所述的用于高矿化度油藏储层的复合解堵工艺,其特征在于,所述缓蚀剂为氧乙基化的烷基酚和烷芳基磺酸盐按质量比1~5:1~2的混合物、Lan-826缓蚀剂、Lan-826缓蚀剂中的一种。
8.根据权利要求1所述的用于高矿化度油藏储层的复合解堵工艺,其特征在于,所述防盐解堵剂和复合除垢剂的用量根据储层堵塞程度,并结合有效厚度、有效孔度及处理半径来确定,计算方法如下:
V=πr2hΦ;其中V-处理液挤注量,单位m3,r-油井处理半径,单位m,h-油层有效厚度,单位m,Φ-油层孔隙度,单位%。
9.根据权利要求1所述的用于高矿化度油藏储层的复合解堵工艺,其特征在于,注入储层解堵各阶段用复合解堵液过程中施工压力低于油井地层破裂压力,施工排量300~500L/min。
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