CN111648733A - 一种钻井或固井用高密度球形颗粒复合加重剂及其制备方法 - Google Patents
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Abstract
本发明公开了一种钻井或固井用高密度球形颗粒复合加重剂,所述加重剂密度为7.0~7.5g/cm3,粒径为80~425目。本发明还公开了所述复合加重剂的制备方法,通过所述制备方法可实现加重剂比重大,粒径可控,并且所述加重剂具有较好趋于零维球形结构的颗粒形貌,在配入钻井液中,其流动性好,酸容性好,可循环使用;用于固井液中,具有良好的分散、悬浮稳定性能,并且泌水率低的效果。
Description
技术领域
本发明涉及石油钻井领域的钻井液所用的加重剂,具体涉及一种石油、天然气钻井或固井用高密度球形颗粒复合加重剂及其制备方法。
背景技术
随着油气勘探向深层和复杂地层的发展,油气埋藏越来越深,地层压力系数越来越高,钻遇的超高压气层、盐水层越多,高密度钻井液的应用范围越来越广。
为满足深井、超深井、高压井、复杂井钻井、固井工程需要,要求钻井、固井液密度合适,流变性好,滤失造壁性能好,抑制性强。目前钻井作业中使用的高密度加重剂密度一般在6.5~7.3(g/cm3)(B/T5005-2001),所采用的材料是铁矿石粉和还原还铁粉为主,这种高密度加重剂是通过粉碎研磨而制备出的产品。但此产品结构不规则,级配性能差,导致高复合加重剂的比表面低,在配制钻井、固井液时,配伍设计困难,无法满足钻井、固井液的作业要求。并且当钻井、固井过程中遇到窄密度窗口井,高温高压井,大位移井以及深水钻井时需要钻井、固井液具有更高的密度、更好的流变性、更大的沉降稳定性以及对储层损害程度最低等。另一方面,钻井过程中,钻具进入井眼时与套管或井壁发生接触,产生摩擦,使得扭矩和摩阻增加,套管发生磨损。并且因钻井时间延长、钻杆作用在套管上侧向力的增加等因素,使套管和钻柱的磨损问题越来越突出,因此减少技术套管磨损和破裂后的处理问题也是急需解决的难点。
常规普通钻井液在解决这些问题方面均受到了一定的限制,尤其是流变性问题。通常的处理方法是使用非水溶性惰性加重剂,这种方法可使钻井液的密度达到要求(可满足2.0~2.5g/cm3密度的要求),但同时带来钻井液固相含量过高,塑性粘度(PV)明显提高,如土的含量稍有增加,其动、静切力(YP、G)就会大幅度提高,造成钻井液流变性差,钻井难度加大。
发明内容
针对现有技术中所存在的问题,本发明目的在于提供一种钻井或固井用高密度球形颗粒复合加重剂及其制备方法。所述加重剂比重为7.0~7.5g/cm3,粒径可控,在配入钻井液使用时,具有流动性好,酸容性好,还可循环使用;用于固井液中,具有良好的分散、悬浮稳定性能。
本发明具体技术方案为:
1.一种钻井或固井用高密度球形颗粒复合加重剂,所述加重剂密度为7.0~7.5g/cm3,粒径为80~425目。
优选的,所述加重剂组成元素包括:75~90份Fe,3~10份O,3~10份C,0~5份Si,0~3份Zn,0~3份Ca。
进一步,所述加重剂酸溶率大于90%,剩磁Br接近于零。
进一步,所述加重剂适用于作为钻井深度在5000米以上的石油和天然气钻井或固井用高密度复合加重剂。
2.一种钻井或固井用高密度球形颗粒复合加重剂的制备方法,包括如下工艺步骤:
1)选取原材料:以金属或合金为原材料,并对原材料成分进行分析确定;
2)原材料精选除杂:采用磁选法和沉降静置法除去尘泥沙杂质;
3)氧化还原除杂:在700~900℃下进行氧化还原除去各种有害杂质;
4)粗化研磨:将经步骤3)所得材料进行第一次粗化研磨,形成粒径为40~80目内的粗颗粒;
5)球磨化粉碎:将粗颗粒在一定磨料级配的作用下进行细磨,磨料选用超硬度球形级配磨料,粗颗粒研磨成粒径为80~425目以下的无尖角的颗粒粉末料;
6)利用等离子高压雾化球形工艺技术,在液氮或液氨的作用下进行球形颗粒结晶化处理,通过调控气喷雾化速度,制备得到不同球形粒径的复合加重剂。
进一步,步骤1)所述原材料为冶炼厂生产的低碳钢合金边角料、机械加工厂的金属废料、废旧设备上的金属或合金材料的一种或几种。
进一步,步骤3)所述除杂工艺为:高温除去原材料中的油污或其它易挥发分解的有机矿物质,氧化除去原材料中的硫、磷、硅、镁等杂质,液氨除去原材料中多余的氧和碳;
进一步,步骤6)工艺参数设置为:气压:0.5~0.9MPa,功率:46~65kW,雾化冷却距离:70~150mm,送粉量:70~5000g/min,气氛控制:360度喷射冷却经晶。
进一步,保证步骤1)~步骤3)原材料除杂处理后成分组成元素质量比例为:Fe:O:C:Si:Zn:Ca为75~90:3~10:3~10:0~5:0~3:0~3。
本发明有益效果在于:本发明所公开的加重剂以金属合金、回收废旧金属或合金为原材料,采用金属合成化技术、超细球化处理技术、粒径控制技术、复合配制技术以及磁化对消技术等,制备出满足石油和天然气钻井、固井用高密度要求的低磁或无磁性球形复合加重剂,该复合加重剂产品的密度为7.0~7.5(g/cm3),球形粒径为80~425目可调。并且所述加重剂具有较好趋于零维球形结构的颗粒形貌,在配入钻井液中,其流动性好,酸容性好,可循环使用;用于固井液中,具有良好的分散、悬浮稳定性能,泌水率低。
具体实施方式
下面将结合具体实施例对本发明做进一步说明。
按如下所述工艺制备球形颗粒复合加重剂:
1)选取原材料:以低碳钢合金为原材料,并对原材料成分进行分析确定;
2)原材料精选除杂:采用磁选法和沉降静置法除去尘泥沙杂质;
3)氧化还原除杂:在700~900℃下进行氧化还原除去各种有害杂质,高温除去原材料中的油污或其它易挥发分解的有机矿物质,氧化除去原材料中的硫、磷、硅、镁等杂质,液氨除去原材料中多余的氧和碳;经过以上三步骤后,对材料组分进一步检测分析,原料成分配比如下:Fe:O:C:Si:Zn:Ca为80:5:7:3:2:2。
4)粗化研磨:将经步骤3)所得材料进行第一次粗化研磨,形成粒径为40~80目内的粗颗粒;
5)球磨化粉碎:将粗颗粒在一定磨料级配的作用下进行细磨,磨料选用超硬度球形级配磨料,粗颗粒研磨成粒径为80~425目以下的无尖角的颗粒粉末料;
6)利用等离子高压雾化球形工艺技术,在液氮或液氨的作用下进行球形颗粒结晶化处理,工艺参数设置为:气压:0.7MPa,功率:50kW,雾化冷却距离:90mm,送粉量:70~5000g/min,气氛控制:360度喷射冷却经晶。最终得到加重剂,加重剂密度7.0~7.5g/cm3,粒径为80~425目。
对以上实施例所得加重剂按如下所示进行配比使用并与传统加重剂进行性能比对评估:
配制高密度水泥浆,在其它配方不变的情况下,采用密度为4.6~6.0g/cm3常规加重剂在配制2.5g/cm3密度水泥浆时,掺量为100~140%,相同养护条件下,强度为16.3MPa,而本加重剂密度7.0~7.5g/cm3,用其配制2.5g/cm3密度水泥浆时,掺量为75~78%,强度为22.1MPa。具体对比如表1所示:
表1常规加重剂与本实施例加重剂性能比对
通过上述实验可验证,本发明所述加重剂在实际运用中,不仅可以降低加重剂材料使用量,而且产品性能大大优于传统加重剂,完全能够满足当前钻采地层对钻井、固井液的设计要求。
针对盐膏层水泥浆配伍实验:350阿克苏G+70~110%本实施例加重剂以及其他常用组分,实验结果如表2所示:
表2本加重剂在盐膏层水泥浆配伍实验中性能指标
从表2可知,本加重剂在盐膏层水泥浆配伍实验中,水泥浆密度可调,稳定性好,流变性好,能满足盐膏层水泥浆使用要求。
最后说明的是,以上对本发明的具体实施方式作了详细说明,但是本发明并不限于上述实施方式,在本领域普通技术人员所具备的知识范围内,还可以在不脱离本发明宗旨的前提下作出各种变化。
Claims (9)
1.一种钻井或固井用高密度球形颗粒复合加重剂,其特征在于,所述加重剂密度为7.0~7.5g/cm3,粒径为80~425目。
2.根据权利要求1所述一种钻井或固井用高密度球形颗粒复合加重剂,其特征在于,按质量份数计,所述加重剂组成元素包括:75~90份Fe,3~10份O,3~10份C,0~5份Si,0~3份Zn,0~3份Ca。
3.根据权利要求1所述一种钻井或固井用高密度球形颗粒复合加重剂,其特征在于,所述加重剂酸溶率大于90%,剩磁Br接近于零。
4.根据权利要求1所述一种钻井或固井用高密度球形颗粒复合加重剂,其特征在于,所述加重剂适用于作为钻井深度在5000米以上的石油和天然气钻井、固井水用加重剂。
5.一种钻井或固井用高密度球形颗粒复合加重剂的制备方法,其特征在于,包括如下工艺步骤:
1)选取原材料:以金属或合金为原材料,并对原材料成分进行分析确定;
2)原材料精选除杂:采用磁选法和沉降静置法除去尘泥沙杂质;
3)氧化还原除杂:在700~900℃下进行氧化还原除去各种有害杂质;
4)粗化研磨:将经步骤3)所得材料进行第一次粗化研磨,形成粒径为40~80目内的粗颗粒;
5)球磨化粉碎:将粗颗粒在一定磨料级配的作用下进行细磨,磨料选用超硬度球形级配磨料,粗颗粒研磨成粒径为80~425目以下的无尖角的颗粒粉末料;
6)利用等离子高压雾化球形工艺技术,在液氮或液氨的作用下进行球形颗粒结晶化处理,通过调控气喷雾化速度,制备得到不同球形粒径的复合加重剂。
6.根据权利要求5所述一种钻井或固井用高密度球形颗粒复合加重剂的制备方法,其特征在于,步骤1)所述原材料为冶炼厂生产的低碳钢合金边角料、机械加工厂的金属废料、废旧设备上的金属或合金材料的一种或几种。
7.根据权利要求5所述一种钻井或固井用高密度球形颗粒复合加重剂的制备方法,其特征在于,步骤3)所述除杂工艺为:高温除去原材料中的油污或其它易挥发分解的有机矿物质,氧化除去原材料中的硫、磷、硅、镁等杂质,液氨除去原材料中多余的氧和碳。
8.根据权利要求5所述一种石油、天然气钻井或固井用高密度球形颗粒复合加重剂的制备方法,其特征在于,步骤6)工艺参数设置为:气压:0.5~0.9MPa,功率:46~65kW,雾化冷却距离:70~150mm,送粉量:70~5000g/min,气氛控制:360度喷射冷却经晶。
9.根据权利要求5所述一种石油、天然气钻井或固井用高密度球形颗粒复合加重剂的制备方法,其特征在于,保证步骤1)~步骤3)原材料除杂处理后成分组成元素质量比例为:Fe:O:C:Si:Zn:Ca为75~90:3~10:3~10:0~5:0~3:0~3。
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CN114614132A (zh) * | 2022-03-08 | 2022-06-10 | 宜宾光原锂电材料有限公司 | 一种废旧锂电池放电方法 |
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CN114426415B (zh) * | 2022-01-18 | 2022-11-15 | 中国石油化工股份有限公司 | 一种页岩气固井用高密度防窜韧性水泥浆体系及其制备方法和应用 |
CN114614132A (zh) * | 2022-03-08 | 2022-06-10 | 宜宾光原锂电材料有限公司 | 一种废旧锂电池放电方法 |
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