CN101255022A - 一种水泥添加剂 - Google Patents
一种水泥添加剂 Download PDFInfo
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- CN101255022A CN101255022A CNA2008101029868A CN200810102986A CN101255022A CN 101255022 A CN101255022 A CN 101255022A CN A2008101029868 A CNA2008101029868 A CN A2008101029868A CN 200810102986 A CN200810102986 A CN 200810102986A CN 101255022 A CN101255022 A CN 101255022A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Ceramic Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
本发明公开了一种水泥添加剂,包括:丙稀酰胺,含量为4~8%,优选为4~5%;交联剂,含量为2~4%,优选为2~3%,选自有机硼或硼砂;引发剂,含量为1~3.5%,优选为1~2%,选自强碱,优选为氢氧化钠或氢氧化钾;增强剂,含量为1~4%,优选为1~2.5%,选自硅粉或粉煤灰;溶剂为水。本发明的水泥添加剂应用到油田固井的水泥体系中,能够防止气窜,提高固井质量,固井质量合格率由原来的45%提高到94%以上。
Description
技术领域
本发明涉及一种水泥添加剂,特别是涉及一种用于油田固井的水泥添加剂。
背景技术
针对油藏埋深浅、油气比高,地下原油溶解有大量的天然气、原油粘度低、密度小,当打开油层后,随压力下降至饱和压力以下时,地层原油严重脱气,在常规水泥固井过程中,脱出的气体窜入水泥石基体,或进入水泥与套管或水泥与井壁之间的间隙中造成层间互窜甚至窜至井口,最终导致水泥石胶结强度低或层间窜流,严重影响了固井质量,即使采用挤水泥等补救措施也很难奏效,对油田后续作业如注水、酸化压裂和分层开采等造成不利影响,甚至无法进行。另外由于油层层间差异大,高压层与低压层同时存在,若为了防止气窜而加大水泥浆密度,会造成对低压层的污染,甚至压漏,若水泥浆密度过小,会加剧高压层气窜,影响固井质量,严重时地层油、气、水可窜至地面。
发明内容
本发明要解决的技术问题是提供一种用于油田固井的水泥添加剂,以防止气窜,提高固井质量。
为解决上述技术问题,本发明提供了一种水泥添加剂,其包括如下组分:丙稀酰胺,含量为4~8%,优选为4~5%;交联剂,含量为2~4%,优选为2~3%,选自有机硼或硼砂;引发剂,含量为1~3.5%,优选为1~2%,选自强碱,优选为氢氧化钠或氢氧化钾;增强剂,含量为1~4%,优选为1~2.5%,选自硅粉或粉煤灰;其余为水,用作溶剂,以上百分含量均以重量计。
本发明的水泥添加剂通过将各组分在常压下,于75~90℃下发生交联聚合,形成凝胶,之后经烘干、粉碎、筛分制得,水泥添加剂的粒度优选为0.5-0.9mm。
本发明的水泥添加剂,在加入到常规的水泥体系后,由于该添加剂的比重较水泥小的多,加入该添加剂后,在不提高水泥浆密度的前提下,就可以达到防气窜的目的,并且在水泥凝固过程中,添加剂也随之膨胀,体膨型添加剂对水泥凝固产生动态逆反应,膨胀作功,大大提高了水泥体的强度、水泥与套管、水泥与地层的胶结强度,从而有效地防止了气窜对固井的影响,固井质量合格率由原来的45%提高到94%以上。
具体实施方式
下面结合实施例详细描述本发明。
实施例1
将4%(重量)的丙稀酰胺,3%有机硼,1%氢氧化钠,2.5%硅粉和水在75℃下发生交联聚合,形成凝胶,之后烘干、粉碎、筛分,制得粒度为0.5-0.9mm的水泥添加剂。
将上述水泥添加剂加入到固井水泥浆中,100份(重量)水泥浆中加入1.5份水泥添加剂,采用本实施例的水泥添加剂后,防气效果好,确保了固井质量,固井质量合格率达94%。
实施例2
将5%(重量)的丙稀酰胺,2%硼砂,2%氢氧化钠,4%硅粉和水在80℃下发生交联聚合,形成凝胶,之后烘干、粉碎、筛分,制得粒度为0.5-0.9mm的水泥添加剂。
将上述水泥添加剂加入到固井水泥浆中,100份(重量)水泥浆中加入2份水泥添加剂,采用本实施例的水泥添加剂后,防气效果好,确保了固井质量,固井质量合格率达97%。
实施例3
将8%(重量)的丙稀酰胺,4%有机硼,3.5%氢氧化钾,1%粉煤灰和水在90℃下发生交联聚合,形成凝胶,之后烘干、粉碎、筛分,制得粒度为0.5-0.9mm的水泥添加剂。
将上述水泥添加剂加入到固井水泥浆中,100份(重量)水泥浆中加入3份水泥添加剂,采用本实施例的水泥添加剂后,防气效果好,确保了固井质量,固井质量合格率达95%。
Claims (10)
1、一种水泥添加剂,其包括如下组分:
丙稀酰胺 4~8%
交联剂 2~4%
引发剂 1~3.5%
增强剂 1~4%
水 余量
以重量计。
2、如权利要求1所述的添加剂,其中,所述丙稀酰胺的含量为4~5%。
3、如权利要求1所述的添加剂,其中,所述的交联剂为有机硼或硼砂。
4、如权利要求1或3所述的添加剂,其中,所述的交联剂的含量为2~3%。
5、如权利要求1所述的添加剂,其中,所述的引发剂为强碱。
6、如权利要求5所述的添加剂,其中,所述的引发剂为氢氧化钠或氢氧化钾。
7、如权利要求1、5或6所述的添加剂,其中,所述的引发剂的含量为1~2%。
8、如权利要求1所述的添加剂,其中,所述的增强剂为硅粉或粉煤灰。
9、如权利要求1或8所述的添加剂,其中,所述的增强剂的含量为1~2.5%。
10、如权利要求1所述的水泥添加剂,其中,所述的水泥添加剂的粒度为0.5~0.9mm。
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Publication number | Priority date | Publication date | Assignee | Title |
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CN1003238B (zh) * | 1986-09-16 | 1989-02-08 | 石油部施工技术研究所 | 水下混凝土外加剂 |
IN169892B (zh) * | 1987-03-23 | 1992-01-04 | Phillips Petroleum Co | |
US6087418A (en) * | 1998-01-22 | 2000-07-11 | Nippon Shokubai Co., Ltd. | Cement admixture and cement composition |
CN1472418A (zh) * | 2003-06-26 | 2004-02-04 | 辽宁天意实业股份有限公司 | 一种高温高压人工防砂井壁及其施工工艺 |
CN100500794C (zh) * | 2006-04-24 | 2009-06-17 | 淄博永麒化工技术开发有限公司 | 油田固井用防气窜水泥浆 |
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