CN102071004B - 一种低聚物酸性压裂液 - Google Patents
一种低聚物酸性压裂液 Download PDFInfo
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Abstract
本发明提供了一种低聚物酸性压裂液。该压裂液体系包括下列各组分,各组分按质量百分比配比:0.35%~0.40%低聚物、0.5%~0.6%酸性交联剂、0.06%~0.08%过硫酸钾及余量的水。该低聚合物冻胶压裂液由低聚物为稠化剂,具有与清洁压裂液类似的无残渣特性;交联剂为酸性,整个压裂液体系显弱酸性,特别适用于碱敏性储层的压裂改造,体系依靠冻胶携砂,可充分保证高砂比施工。
Description
技术领域
本发明涉及油田采油领域中所用的一种压裂液,尤其是一种低聚物酸性压裂液。
背景技术
现有的压裂液体系的交联条件为碱性(pH7.5-12),酸性条件下无法形成可调挂的交联冻胶。对于碱敏性地层的开发有较大伤害。对于中等碱敏储层的开发,如果压裂液的pH值为7.5-8.5,渗透率就会下降10%-20%;在酸性条件下,膨胀性粘土的膨胀和运移作用明显小于碱性条件;压裂液pH值由10变为5时,残渣含量会降低30%左右。酸性压裂液的目的就是降低碱敏储层开发中的各种伤害。
发明内容
为了解决背景技术中存在的问题,本发明提供一种低聚物酸性压裂液,该低聚合物冻胶压裂液由低聚物为稠化剂,具有与清洁压裂液类似的无残渣特性;交联剂为酸性,整个压裂液体系显弱酸性,特别适用于碱敏性储层的压裂改造,体系依靠冻胶携砂,可充分保证高砂比施工。
本发明采用的技术方案是:该压裂液体系包括下列各组分,各组分按质量百分比配比: 0.35%~0.40%低聚物、0.5%~0.6%酸性交联剂、0.06%~0.08%过硫酸钾及余量的水。该配比可以保证在最低成本下,耐温耐剪切性能达到施工要求,保证压裂施工的进行。
本发明的有益效果是:本发明可在酸性条件下交联成冻胶,在90℃、170s- 1下剪切90min粘度在100mPa.s左右;残渣为45mg/L;防膨率为84%。低聚物酸性压裂液具有压裂液冻胶为酸性,携砂性能好、残渣含量低、返排率高、对地层伤害较小等优点,解决了中等碱敏储层,侵入液为碱性时渗透率下降,粘土膨胀和运移等问题,满足碱敏性储层的压裂改造需求。
具体实施方式:
下面结合实施例对本发明作进一步说明:下述各原料按质量百分比配比。
方案1: 0.35%低聚物、0.5%酸性交联剂、0.06%过硫酸钾及余量的水,该配方适合70℃地层;
方案2: 0.4%低聚物、0.6%酸性交联剂、0.08%过硫酸钾及余量的水,该配方适合90℃地层;
本发明的制备方法:在水中加入低聚物,搅拌至完全溶胀,测量pH值为5-6,然后加入过硫酸钾,搅拌均匀;再加入酸性交联剂,搅拌均匀即可。
本发明折压裂液性能实验:
1、耐温耐剪切性能:90℃、170 s-1剪切90min后粘度为120mPa.s;70℃、170 s-1剪切90min后粘度为103mPa.s,完全可以满足压裂施工的要求。
2、破胶性能及残渣含量:随温度的升高和破胶剂浓度的增加,破胶速度加快,在现场施工可通过调整破胶剂的加量,控制破胶时间。0.4%配比的低聚物酸性压裂液残渣为45mg/L,0.35%配比的低聚物酸性压裂液残渣为32mg/L远低于常规碱性压裂液。
3、防膨性能:低聚物压裂液体系不需要额外添加粘土稳定剂。其防膨率为84%,与添加防膨剂的常规压裂液相似。
4、静态滤失性能:在压差3.5MPa下,90℃配方体系的滤失速率8.9×10-4m/min1/2,70℃配方体系的滤失速率8.1×10-4m/min1/2。
5、导流能力伤害评价:90℃低聚物酸性压裂液在铺砂浓度5kg/m2条件下,导流能力伤害率为15.2%,比常规碱性压裂液低50.3%;在铺砂浓度10kg/m2条件下导流能力伤害率为17.8%,比常规碱性压裂液低52.1%。
采用低聚物酸性压裂液在弱碱敏地层进行压裂施工的2口油井的平均采油强度为0.65t/m.d,比同区块同类井提高53%。通过现场试验,证实低聚物酸性压裂液能够满足碱敏地层的压裂施工,降低伤害,提高压后效果。
CRY-11型低聚物及JRY-11型酸性交联剂均购自廊坊市源通石油科技有限公司。
Claims (1)
1.一种低聚物酸性压裂液,该压裂液体系包括下列各组分,各组分按质量百分比配比:0.35%~0.40%低聚物、0.5%~0.6%酸性交联剂、0.06%~0.08%过硫酸钾及余量的水;所述的低聚物为CRY-11型低聚物,所述的酸性交联剂为JRY-11型酸性交联剂。
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