CN115974454A - Middle-deep heat exchange hole well cementation material and preparation method thereof - Google Patents
Middle-deep heat exchange hole well cementation material and preparation method thereof Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及地热供暖技术领域,尤其涉及一种中深层换热孔固井材料及制备方法。The invention relates to the technical field of geothermal heating, in particular to a medium-deep layer heat exchange hole cementing material and a preparation method.
背景技术Background technique
地热能是来自地球内部的可再生热能,它起源于地球内部的岩浆、以及放射性物质的衰变,这些热量通过地层热传导,源源不断的由下部高温岩层向上部低温岩层传递,储量巨大且可再生。目前地热能从利用形态上可划分成,水热型地热(水源)与干热岩(地源)两种。Geothermal energy is renewable heat energy from the interior of the earth. It originates from the decay of magma and radioactive substances in the interior of the earth. The heat conducts heat through the formation, and is continuously transferred from the lower high-temperature rock layer to the upper low-temperature rock layer. The reserves are huge and renewable. At present, geothermal energy can be divided into two types from the utilization form, hydrothermal geothermal (water source) and dry hot rock (ground source).
水热型地热(水源),以水为介质,利用高温地下水的热量,之后将地热尾水回灌入地下,由于该项利用形式,地下水流速较快,因而单井取热影响半径很大,采热功率也很大。Hydrothermal geothermal (water source), using water as the medium, utilizes the heat of high-temperature groundwater, and then refills the geothermal tail water into the ground. Due to this utilization form, the groundwater flows faster, so the heat extraction radius of a single well is large. The heating power is also great.
但是对于中深层地埋管,由于不利用地下水,热量的提取便只能通过高温岩石传导至套管环空水泥环,再传导至套管,继续传递至井筒内的换热流体,从而导致采热效率较低。However, for middle and deep buried pipes, since groundwater is not used, heat extraction can only be conducted through high-temperature rocks to the casing annulus cement sheath, then to the casing, and then to the heat exchange fluid in the wellbore. Thermal efficiency is low.
发明内容Contents of the invention
1.要解决的技术问题1. Technical problems to be solved
本发明的目的是为了解决现有技术中对于中深层地埋管,由于不利用地下水,热量的提取便只能通过高温岩石传导至套管环空水泥环,再传导至套管,继续传递至井筒内换热流体的问题,而提出的一种中深层换热孔固井材料及制备方法。The purpose of the present invention is to solve the problems in the prior art for medium-deep buried pipes. Since groundwater is not used, heat extraction can only be conducted to the casing annulus cement sheath through high-temperature rocks, then to the casing, and then to the casing. In order to solve the problem of heat exchange fluid in the wellbore, a medium-deep layer heat exchange hole cementing material and its preparation method are proposed.
2.技术方案2. Technical solution
为了实现上述目的,本发明采用了如下技术方案:In order to achieve the above object, the present invention adopts the following technical solutions:
一种中深层换热孔固井材料,所述固井材料包括以下质量比的组成成分:细砂70-80%、石墨粉15-25%、丙烯酸酯4%和聚丙烯酰胺1%。A medium-deep layer heat exchange hole cementing material, the cementing material comprises the following components in mass ratio: 70-80% of fine sand, 15-25% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
优选地,所述固井材料包括以下质量比的组成成分:细砂80%、石墨粉15%、丙烯酸酯4%和聚丙烯酰胺1%。Preferably, the cementing material comprises the following components by mass ratio: fine sand 80%, graphite powder 15%, acrylate 4% and
优选地,所述固井材料包括以下质量比的组成成分:细砂70%、石墨粉25%、丙烯酸酯4%和聚丙烯酰胺1%。Preferably, the cementing material comprises the following components by mass ratio: fine sand 70%, graphite powder 25%, acrylate 4% and
优选地,所述固井材料包括以下质量比的组成成分:细砂75%、石墨粉20%、丙烯酸酯4%和聚丙烯酰胺1%。Preferably, the cementing material includes the following components by mass ratio: fine sand 75%, graphite powder 20%, acrylate 4% and
本发明中还提出了一种中深层换热孔固井材料的制备方法,包括以下步骤:The present invention also proposes a method for preparing a medium-deep layer heat exchange hole cementing material, comprising the following steps:
步骤1:将一定质量比的石墨粉、细砂和丙烯酸酯之间进行均匀混合,得到混合物;Step 1: uniformly mix graphite powder, fine sand and acrylate in a certain mass ratio to obtain a mixture;
步骤2:然后将聚丙烯酰胺添加入步骤1中的混合物中,得到所述固井材料。Step 2: Then add polyacrylamide into the mixture in
优选地,所述细砂的密度为1.9-2.3g/cm3、规格为100目。Preferably, the fine sand has a density of 1.9-2.3 g/cm 3 and a specification of 100 mesh.
本发明中还提出了中深层换热孔固井,包括表层套管和人工井底,所述表层套管的外部覆盖有表层水泥固井,所述表层套管的内部填充有所述固井材料。The present invention also proposes medium-deep layer heat exchange hole cementing, including surface casing and artificial well bottom, the outside of the surface casing is covered with surface cement cementing, and the inside of the surface casing is filled with the cementing Material.
本发明中还提出了中深层换热孔固井的施工方法,包括以下步骤:The present invention also proposes a construction method for medium-deep heat exchange hole cementing, comprising the following steps:
S1:固井材料在地表混合均匀后,从表层套管外注入,同时表层套管内采用空气压缩机洗出钻井液,外注内吸的反循环工艺,保证固井材料顺利下入孔底;S1: After the cementing material is evenly mixed on the surface, it is injected from the outside of the surface casing. At the same time, the air compressor is used to wash out the drilling fluid in the surface casing, and the reverse circulation process of external injection and internal suction ensures that the cementing material is smoothly lowered into the bottom of the hole;
S2:固井完成后,然后在表层套管内下入钻杆,注入水泥浆,形成人工井底。S2: After the cementing is completed, the drill pipe is run into the surface casing, and the cement slurry is injected to form an artificial well bottom.
3.有益效果3. Beneficial effect
相比于现有技术,本发明的优点在于:Compared with the prior art, the present invention has the advantages of:
本发明中,通过采用新型固井材料,可以大幅提升换热孔环空导热率,传统水泥环导热率为0.7-1w/(m·k),新型固井材料导热率可达2.5w/(m·k)以上,极大的提升了单井换热能力,具有极高的经济效益。In the present invention, by adopting the new cementing material, the thermal conductivity of the annulus of the heat exchange hole can be greatly improved. The thermal conductivity of the traditional cement sheath is 0.7-1w/(m k), and the thermal conductivity of the new cementing material can reach 2.5w/( m·k) or above, which greatly improves the heat exchange capacity of a single well and has extremely high economic benefits.
附图说明Description of drawings
图1为本发明提出的一种中深层换热孔固井的结构示意图。Fig. 1 is a structural schematic diagram of a middle-deep layer heat exchange hole cementing proposed by the present invention.
图中:1表层套管、2人工井底、3表层水泥固井。In the picture: 1 surface casing, 2 artificial well bottom, 3 surface cementing.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,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。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.
实施例1:Example 1:
一种中深层换热孔固井材料,固井材料包括以下质量比的组成成分:细砂70-80%、石墨粉15-25%、丙烯酸酯4%和聚丙烯酰胺1%。The invention relates to a well cementing material for medium-deep heat exchange holes. The well cementing material comprises the following components in mass ratio: 70-80% of fine sand, 15-25% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
本发明中,中深层换热孔固井材料的制备方法,包括以下步骤:In the present invention, the preparation method of the medium-deep layer heat exchange hole cementing material comprises the following steps:
步骤1:将一定质量比的石墨粉、细砂和丙烯酸酯之间进行均匀混合,得到混合物,细砂的密度为1.9-2.3g/cm3、规格为100目;Step 1: uniformly mix graphite powder, fine sand and acrylate in a certain mass ratio to obtain a mixture, the density of the fine sand is 1.9-2.3g/cm 3 , and the specification is 100 mesh;
步骤2:然后将聚丙烯酰胺添加入步骤1中的混合物中,得到固井材料。Step 2: Then polyacrylamide is added to the mixture in
本发明中,通过采用新型固井材料,可以大幅提升换热孔环空导热率,传统水泥环导热率为0.7-1w/(m·k),新型固井材料导热率可达2.5w/(m·k)以上,极大的提升了单井换热能力,具有极高的经济效益。In the present invention, by adopting the new cementing material, the thermal conductivity of the annulus of the heat exchange hole can be greatly improved. The thermal conductivity of the traditional cement sheath is 0.7-1w/(m k), and the thermal conductivity of the new cementing material can reach 2.5w/( m·k) or above, which greatly improves the heat exchange capacity of a single well and has extremely high economic benefits.
实施例2:Example 2:
其具有上述实施例的实施内容,其中,对于上述实施例的具体实施方式可参阅上述描述,此处的实施例不作重复详述;而在本申请实施例中,其与上述实施例的区别在于:It has the implementation content of the above-mentioned embodiments, wherein, for the specific implementation of the above-mentioned embodiments, please refer to the above-mentioned description, and the embodiments here will not be repeated in detail; and in the embodiments of the present application, the difference from the above-mentioned embodiments is that :
一种中深层换热孔固井材料,固井材料包括以下质量比的组成成分:细砂80%、石墨粉15%、丙烯酸酯4%和聚丙烯酰胺1%。A well cementing material for medium-deep heat exchange holes. The cementing material comprises the following components in mass ratio: 80% fine sand, 15% graphite powder, 4% acrylate and 1% polyacrylamide.
实施例3:Example 3:
其具有上述实施例的实施内容,其中,对于上述实施例的具体实施方式可参阅上述描述,此处的实施例不作重复详述;而在本申请实施例中,其与上述实施例的区别在于:It has the implementation content of the above-mentioned embodiments, wherein, for the specific implementation of the above-mentioned embodiments, please refer to the above-mentioned description, and the embodiments here will not be repeated in detail; and in the embodiments of the present application, the difference from the above-mentioned embodiments is that :
一种中深层换热孔固井材料,固井材料包括以下质量比的组成成分:细砂70%、石墨粉25%、丙烯酸酯4%和聚丙烯酰胺1%。A well cementing material for medium-deep heat exchange holes. The cementing material comprises the following components in mass ratio: 70% of fine sand, 25% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
实施例4:Example 4:
其具有上述实施例的实施内容,其中,对于上述实施例的具体实施方式可参阅上述描述,此处的实施例不作重复详述;而在本申请实施例中,其与上述实施例的区别在于:It has the implementation content of the above-mentioned embodiments, wherein, for the specific implementation of the above-mentioned embodiments, please refer to the above-mentioned description, and the embodiments here will not be repeated in detail; and in the embodiments of the present application, the difference from the above-mentioned embodiments is that :
一种中深层换热孔固井材料,固井材料包括以下质量比的组成成分:细砂75%、石墨粉20%、丙烯酸酯4%和聚丙烯酰胺1%。A well cementing material for medium-deep heat exchange holes. The cementing material comprises the following components in mass ratio: 75% of fine sand, 20% of graphite powder, 4% of acrylate and 1% of polyacrylamide.
实施例5:Example 5:
其具有上述实施例的实施内容,其中,对于上述实施例的具体实施方式可参阅上述描述,此处的实施例不作重复详述;而在本申请实施例中,其与上述实施例的区别在于:It has the implementation content of the above-mentioned embodiments, wherein, for the specific implementation of the above-mentioned embodiments, please refer to the above-mentioned description, and the embodiments here will not be repeated in detail; and in the embodiments of the present application, the difference from the above-mentioned embodiments is that :
参照图1,中深层换热孔固井,包括表层套管和人工井底,表层套管的外部覆盖有表层水泥固井,表层套管的内部填充有固井材料。Referring to Fig. 1, the heat exchange hole cementing in the medium-deep layer includes the surface casing and the artificial well bottom. The outside of the surface casing is covered with surface cement for well cementing, and the inside of the surface casing is filled with cementing materials.
中深层换热孔固井的施工方法,包括以下步骤:The construction method of heat exchange hole cementing in middle and deep layers includes the following steps:
S1:固井材料在地表混合均匀后,从表层套管外注入,同时表层套管内采用空气压缩机洗出钻井液,外注内吸的反循环工艺,保证固井材料顺利下入孔底;S1: After the cementing material is evenly mixed on the surface, it is injected from the outside of the surface casing. At the same time, the air compressor is used to wash out the drilling fluid in the surface casing, and the reverse circulation process of external injection and internal suction ensures that the cementing material is smoothly lowered into the bottom of the hole;
S2:固井完成后,然后在表层套管内下入钻杆,注入水泥浆,形成人工井底。S2: After the cementing is completed, the drill pipe is run into the surface casing, and the cement slurry is injected to form an artificial well bottom.
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.
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