CN113831905A - 一种用于高压深井加重型冲砂钻磨液 - Google Patents
一种用于高压深井加重型冲砂钻磨液 Download PDFInfo
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Abstract
本发明公开了一种用于高压深井的加重型冲砂钻磨液,解决了现有冲砂钻磨液用于高压深井时存在的基液粘度不稳定、加重性能和减阻效果差、携砂性能不稳定的问题。技术方案包括以下组份,其重量比为:水500;加重剂50‑400;耐温耐盐型减阻剂0.05‑1.2;复合增效剂0.5‑2.5;破胶剂:0‑1份。本发明可用于160℃及以下温度油气藏井下冲砂钻磨及洗井作业,加重密度1.0‑1.5g/cm3可调,能有效降低泵注摩阻和井口压力,从而顺利实现高压深井冲砂钻磨作业。
Description
技术领域
本发明涉及油田化学品领域领域,更准确地说,涉及一种用于高压深井加重型冲砂钻磨液。
背景技术
针对深井、超深井、异常高压井、异常高地应力井的储层来说,生产过程中常常出现摩阻高、井口压力大、返出岩屑等物质堵塞井筒导致无法正常生产的情况。此类井储层改造施工压力较高,通常达到90MPa以上,储层温度超过150℃。
目前常用的冲砂钻磨液体系是利用水溶性高分子聚合物配制滑溜水,水溶性高分子聚合物溶于水后大分子链舒展成线性,可以疏导流体,降低流动状态下的阻力,同时大分子链可以聚集并吸附在岩石油管内壁及油藏岩心表面,形成一层有机膜,有效降低冲砂钻磨阻力。但是普通高分子聚合物分子键在高温、高矿化度及高剪切的条件下,易发生断裂,出现分子链卷曲、溶液体系粘度下降等问题,会极大降低甚至失去携砂及减阻效果。
面对高温、高压井况,仅仅利用现有技术很难达成或不满足施工要求。为此需要对冲砂钻磨液进行耐温、耐剪切及加重处理,增加体系密度从而增加井筒内液柱压力,降低井口施工压力。同时良好的耐温耐剪切性能可以使其在高温油气藏井钻洗磨作业时保持良好的减阻性能。
发明内容
本发明要解决的技术问题在于,提供一种用于高压深井加重型冲砂钻磨液,其加重密度可达1.5g/cm3,在高温、高矿化度条件下仍能保持良好的性能指标,增加井筒内液柱压力,降低井口施工压力,适应深井、超深井、高压井、异常高地应力井、致密井的冲砂钻磨作业。
本发明用于高压深井的加重型冲砂钻磨液,包括以下重量比的组份:
所述加重剂为甲酸钠、溴化钠、甲酸钾中的至少一种。研究证明常规钻塞液密度为1-1.04g/cm3,钻塞液密度每增加0.1g/cm3,静液柱压力每千米可提高1MPa,而本发明选用的加重剂与耐温减阻剂配伍性良好,可将冲砂钻磨液密度调至1-1.5g/cm3,极大的增加井筒内液柱压力,降低井口施工压力,保护地面承压管汇和工具安全、降低作业难度。
所述耐温耐盐减阻剂为含有磺酸根基团和刚性苯环结构的接枝型疏水缔合聚合物,且长链烷基(单链)碳数在10-16。
研究发现,1)在相同碳数条件下,直链烷烃的疏水性比支链结构强,更强于芳基,故长链结构聚合物增粘性明显强于支链结构和芳基分子结构。且在一定碳数条件下,碳数越多,增粘效果越好。但另一方面,疏水缔合聚合物的溶解性随分子链增长而降低,因此控制长链烷基(单链)碳数在10-16为好;2)含有苯环的聚合物分子刚性会增强,而聚合物分子链刚性越强,在水溶液中越容易舒展,分子缔合作用越强,则聚合物耐温性越强,在高温条件下聚合物的分子稳定性就越强;3)聚合物溶液的表观粘度随着矿化度变化而发生变化称为聚合物的盐敏性,磺酸根能够与水形成更强的氢键从而提高了在聚合物溶液中的稳定性,而且磺酸根的亲水性更强,增加了共聚物的水溶性,因而磺酸基团的引入可以极大提高共聚物的抗温和抗盐性能。
优选的,所述耐温耐盐减阻剂可以选自1-丙烯酰胺基-2-苯基壬基磺酸钠、1-丙烯酰胺基-4-苯基-6,6-二甲基辛基磺酸钠、1-丙烯酰胺基-3-苯基-5-乙基辛基磺酸钠、1-丙烯酰胺基-2,2,6-三甲基-5-苯基庚基磺酸钠中的至少一种。所述耐温耐盐减阻剂的添加量优选为0.05-1.2重量份,过高则冲砂钻磨液粘度过大容易卡钻且不易返排,过低则冲砂钻磨液粘度太低,携砂性能较差。
优选的,所述复合增效剂包括烷基酚聚氧乙烯聚甲基氧乙烯醚、脂肪醇聚氧乙烯醚、烷基酚聚氧乙烯醚中的一种或多种,以及十六烷基三甲基氯化铵、十八烷基二甲基苄基氯化铵、十八烷基三甲基氯化铵、氯化钾、氯化钠、氯化铵、氯氧化锆中的一种或者多种,以及乙醇、丙醇、异丙醇、乙二醇中的一种。
该复合增效剂具有耐温耐盐性能好、用量少、表面张力低、接触角大、防膨性能优异等优点。能够降低冲砂钻磨液表界面张力,表面张力小于28mN/m,界面张力小于3mN/m,有利于增强进入地层冲砂钻磨液的返排能力,同时能防止水敏性矿物水化膨胀及分散运移而对油气层造成的伤害。
优选的,所述破胶剂为过硫酸钾、过硫酸铵中的至少一种。优选采用填充有上述成份的胶囊破胶剂,所述胶囊破胶剂以耐油、耐水、抗温且强度好的化工原料为囊衣,在水中有较低的释放率和足够的抗压强度,施工结束后在高温高压条件下发生变形、破裂而释放出破胶剂,从而有效地降低钻塞液粘度,大幅度减小钻塞液对地层的伤害。
有益效果:
本发明冲砂钻磨液中减阻剂用量小、生产成本低,残渣少,能够有效降低地层伤害;加重密度在1~1.5g/cm3范围内灵活可调,可根据井口施工压力随时进行加重密度调整。具有优异的减阻、耐温耐盐、抗剪切性能,最高工作温度可达160℃,密度由1g/cm3加重至1.5g/cm3后,粘度下降率低于40%,室内减阻实验减阻率可达67%以上;经过管路的高速剪切后结构可恢复,适合高压深井;可增加井筒内液柱压力,降低井口施工压力,保护地面承压管汇和工具安全、降低作业难度;特别适用于高压深井、超深井、高压井、异常高地应力井、致密井的冲砂钻磨作业。
附图说明
图1为本发明实施例3的减阻率与剪切速率关系示意图;
图2为本发明耐温耐盐减阻剂加量0.1%条件下,冲砂钻磨液密度加重至1.5g/cm3,170℃条件下的剪切恢复性示意图;
图3为本发明在耐温耐盐减阻剂加量为0.15%(与水质量比)条件下利用加重剂对冲砂钻磨液进行加重,加重剂加量(与水质量比)、冲砂钻磨液的粘度与密度关系示意图;
图4为本发明在50℃时的石英砂沉降速度示意图。
具体实施方式
为了对本发明的技术特征、目的和效果有更加清楚的理解,现详细说明本发明的具体实施方式。
实施例1:
一种用于高压深井加重型冲砂钻磨液,其中,冲砂钻磨液按照重量比配制而成,称取水500份,依次加入65份的甲酸钠加重剂、0.05份1-丙烯酰胺基-2-苯基壬基磺酸钠耐温耐盐减阻剂、0.75份复合增效剂(烷基酚聚氧乙烯聚甲基氧乙烯醚:十六烷基三甲基氯化铵:乙醇重量比为3:2:4)、0.1份过硫酸铵;该体系的性能参数如下:冲砂钻磨液密度为1.1g/cm3,室内减阻率为67.2%,表观粘度9.0mPa·s,90℃破胶后,破胶液表面张力23.5mN/m,界面张力2.2mN/m,防膨率84.2%。
实施例2:
一种用于高压深井加重型冲砂钻磨液,其中,冲砂钻磨液按照重量比配制而成,称取水500份,依次加入65份的甲酸钠加重剂、0.05份1-丙烯酰胺基-2-苯基壬基磺酸钠耐温耐盐减阻剂、0.75份复合增效剂(烷基酚聚氧乙烯聚甲基氧乙烯醚:十六烷基三甲基氯化铵:乙醇重量比为3:2:4);该体系的性能参数如下:冲砂钻磨液密度为1.1g/cm3,室内减阻率为68.9%,表观粘度9.0mPa·s,表面张力27.5mN/m,界面张力2.9mN/m,防膨率84.2%。
实施例3:
一种用于高压深井加重型冲砂钻磨液,其中,冲砂钻磨液按照重量比配制而成,称取水500份,依次加入100份甲酸钾和甲酸钠混合加重剂、1.2份1-丙烯酰胺基-4-苯基-6,6-二甲基辛基磺酸钠耐温耐盐减阻剂、1.5份复合增效剂(烷基酚聚氧乙烯醚:十八烷基三甲基氯化铵:乙二醇重量比为2:2.3)、0.1份过硫酸铵;该体系的性能参数如下:冲砂钻磨液密度为1.2g/cm3,室内减阻率为68.9%,表观粘度35.3mPa·s,90℃破胶后,破胶液表面张力24.6mN/m,界面张力2.31mN/m,防膨率84.9%。
实施例4:
一种用于高压深井加重型冲砂钻磨液,其中,冲砂钻磨液按照重量比配制而成,称取水500份,依次加入260份甲酸钾和溴化钠混合加重剂、0.5份1-丙烯酰胺基-3-苯基-5-乙基辛基磺酸钠耐温耐盐减阻剂、2份复合增效剂(脂肪醇聚氧乙烯醚:氯化钾:乙二醇重量比为2:3:3)、0.1份过硫酸铵破胶剂。该体系的性能参数如下:冲砂钻磨液密度为1.4g/cm3,表观粘度20.1mPa·s,室内减阻率为68.9%,90℃破胶后,破胶液表面张力23.9mN/m,界面张力2.43mN/m,防膨率83.9%。
见附图1可知,该配比实施例减阻率室内减阻率为69.8%,减阻效果较实施例1、2优异;附图2可知,该配比实施例在170℃,170s-1剪切速率下,剪切恢复性能优异。
实施例5:
一种用于高压深井加重型冲砂钻磨液,其中,冲砂钻磨液按照重量比配制而成,称取水500份,依次加入305份甲酸钾和溴化钠混合加重剂、0.75份1-丙烯酰胺基-2,2,6-三甲基-5-苯基庚基磺酸钠耐温耐盐减阻剂、2份复合增效剂(烷基酚聚氧乙烯聚甲基氧乙烯醚:氯化铵:乙醇重量比为3:3:4)、0.1份过硫酸铵;该体系的性能参数如下:冲砂钻磨液密度为1.5g/cm3,室内减阻率为68.7%,表观粘度26.7mPa·s,90℃破胶后,破胶液表面张力22.3mN/m,界面张力2.1mN/m,防膨率87.1%。
对比例1:
一种用于高压深井加重型冲砂钻磨液,其中,冲砂钻磨液按照重量比配制而成,称取水500份,依次加入305份甲酸钾和溴化钠混合加重剂、0.02份1-丙烯酰胺基-2,2,6-三甲基-5-苯基庚基磺酸钠耐温耐盐减阻剂、2份复合增效剂(烷基酚聚氧乙烯聚甲基氧乙烯醚:氯化铵:乙醇重量比为3:3:4);该体系的性能参数如下:冲砂钻磨液密度为1.5g/cm3,室内减阻率为46.2%,表观粘度0.71mPa·s,表面张力22mN/m,界面张力2.0mN/m,防膨率91.2%。
对比例2:
一种用于高压深井加重型冲砂钻磨液,其中,冲砂钻磨液按照重量比配制而成,称取水500份,依次加入305份甲酸钾和溴化钠混合加重剂、1.5份1-丙烯酰胺基-2,2,6-三甲基-5-苯基庚基磺酸钠耐温耐盐减阻剂、0.4份复合增效剂(烷基酚聚氧乙烯聚甲基氧乙烯醚:氯化铵:乙醇重量比为3:3:4)、0.1份过硫酸铵;该体系的性能参数如下:冲砂钻磨液密度为1.5g/cm3,室内减阻率为62.7%,表观粘度29.3mPa·s,90℃破胶后,破胶液,表面张力28.9mN/m,界面张力4.5mN/m,防膨率79.4%。
对比例3:
一种用于高压深井加重型冲砂钻磨液,其中,冲砂钻磨液按照重量比配制而成,称取水500份,依次加入260份甲酸钾和溴化钠混合加重剂、0.5份聚丙烯酰胺减阻剂、2份复合增效剂(脂肪醇聚氧乙烯醚:氯化钾:乙二醇重量比为2:3:3)、0.1份过硫酸铵破胶剂。该体系的性能参数如下:冲砂钻磨液密度为1.4g/cm3,室内减阻率为58.4%,表观粘度7.2mPa·s,90℃破胶后,破胶液表面张力22.7mN/m,界面张力2.45mN/m,防膨率73.9%。
对比例4:
一种用于高压深井加重型冲砂钻磨液,其中,冲砂钻磨液按照重量比配制而成,称取水500份,依次加入100份甲酸钾和甲酸钠混合加重剂、1.2份改性聚丙烯酰胺减阻剂、1.5份复合增效剂(烷基酚聚氧乙烯醚:十八烷基三甲基氯化铵:乙二醇重量比为2:2.3)、0.1份过硫酸铵;该体系的性能参数如下:冲砂钻磨液密度为1.2g/cm3,室内减阻率为43.1%,表观粘度3.2mPa·s,90℃破胶后,破胶液表面张力24.3mN/m,界面张力2.35mN/m,防膨率83.7%。
图1为冲砂钻磨液减阻率曲线图,由1可知,实施例4配方冲砂钻磨液室内减阻率为69.8%,减阻效果较实施对比例3优异;
附图2为实施例4在不加破胶剂的条件下的变剪切速率流变曲线图,由图2可知,在170℃,在170s-1和510s-1变剪切速率条件下,初始粘度与剪切后粘度均为21mPa.s左右,剪切恢复性能优异。
附图3为冲砂钻磨液体系加重密度与加重剂加量及表观粘度之间的关系图,由图3可知,冲砂钻磨液的粘度随着加重密度的增加而逐渐减小,当密度由1.04mg/cm3加重至1.50mg/cm3时,粘度由45mPa.s减小为23mPa.s,降粘率<50%,体系耐盐性优异。
附图4为砂子沉降速度与表观粘度及聚合物浓度关系曲线图,由图4可知,随着聚合物加量提升,表观粘度增大,沉降速率减小,可根据现场携砂需求对聚合物加量及粘度进行调整。
Claims (9)
2.根据权利要求1所述的加重型冲砂钻磨液,其特征在于,所述加重剂为甲酸钠、溴化钠、甲酸钾中的至少一种。
3.根据权利要求1所述的加重型冲砂钻磨液,其特征在于,所述加重型冲砂钻磨液密度为1.0-1.5g/cm3。
4.根据权利要求1所述的加重型冲砂钻磨液,其特征在于,所述耐温耐盐减阻剂为含有磺酸根基团和刚性苯环结构的接枝型疏水缔合聚合物,且长链烷基(单链)碳数在10-16。
5.根据权利要求4所述的加重型冲砂钻磨液,其特征在于,所述耐温耐盐减阻剂为1-丙烯酰胺基-2-苯基壬基磺酸钠、1-丙烯酰胺基-4-苯基-6,6-二甲基辛基磺酸钠、1-丙烯酰胺基-3-苯基-5-乙基辛基磺酸钠、1-丙烯酰胺基-2,2,6-三甲基-5-苯基庚基磺酸钠中的至少一种。
6.根据权利要求1或4或5所述的加重型冲砂钻磨液,其特征在于,所述耐温耐盐减阻剂的添加量为0.05-1.2重量份。
7.根据权利要求1所述的加重型冲砂钻磨液,其特征在于,所述复合增效剂包括烷基酚聚氧乙烯聚甲基氧乙烯醚、脂肪醇聚氧乙烯醚、烷基酚聚氧乙烯醚中的一种或多种,以及十六烷基三甲基氯化铵、十八烷基二甲基苄基氯化铵、十八烷基三甲基氯化铵、氯化钾、氯化钠、氯化铵、氯氧化锆中的一种或者多种、以及乙醇、丙醇、异丙醇、乙二醇中的一种。
8.根据权利要求1所述的加重型冲砂钻磨液,其特征在于,所述破胶剂为填充有过硫酸钾、过硫酸铵中的至少一种成分的胶囊破胶剂。
9.根据权利要求1所述的加重型冲砂钻磨液,其特征在于,当体系粘度≥9mPa.s加入破胶剂,且破胶剂应于体系最后添加。
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