Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
PVA oil well cement fluid loss agent and preparation method thereof
The invention discloses a PVA oil well cement fluid loss agent and a preparation method thereof. The PVA oil well cement fluid loss agent is prepared from the following raw materials in percentage by mass: 50-65% of polyvinyl alcohol; 3-5% of a cross-linking agent and borax; and the balance of filler and silicon powder. The fluid loss agent containing the polyvinyl alcohol structure is added into oil well cement, polyvinyl alcohol and borax are cross-linked to form a more stable net-shaped structure, the net-shaped structure is interwoven with cement hydrate, and a compact impermeable filter membrane is formed under pressure difference, so that water loss of cement paste is effectively controlled, fluid channeling is prevented, and the purpose of preventing fluid channeling is achieved. The silicon powder reacts with cement hydrate to form hydrated calcium silicate gel, so that the adsorption capacity can be improved, the permeability of the set cement can be reduced, and the compressive strength of the set cement can be improved. Compared with socialized products of the same type, the product provided by the invention has the characteristics of small water loss, short thickening linear transition time, high compressive strength, strong adaptability to cement and the like, and can meet the requirements of medium-temperature well cementation in different areas.
本发明公开了一种PVA类油井水泥降失水剂及其制备方法，它由以下原料的质量百分比组成：50‑65％聚乙烯醇；3‑5％交联剂，硼砂；余量为填充料，硅粉。本发明将上述含有聚乙烯醇结构的降失水剂加入油井水泥中，聚乙烯醇与硼砂发生交联形成更加稳固的网状结构，与水泥水化物交织，在压差下形成致密的不渗透滤膜从而有效控制水泥浆失水，有利于防止窜流的发生，达到“防窜”的目的。硅粉与水泥水化物反应形成水化硅酸钙凝胶，可增加吸附能力，降低水泥石的渗透率，提高水泥石抗压强度。与同类型社会化产品相比，本发明产品具有失水量小，稠化线型过渡时间短，抗压强度高，对水泥适应性强等特点，能够满足不同区域中温固井的需求。
PVA oil well cement fluid loss agent and preparation method thereof
The invention discloses a PVA oil well cement fluid loss agent and a preparation method thereof. The PVA oil well cement fluid loss agent is prepared from the following raw materials in percentage by mass: 50-65% of polyvinyl alcohol; 3-5% of a cross-linking agent and borax; and the balance of filler and silicon powder. The fluid loss agent containing the polyvinyl alcohol structure is added into oil well cement, polyvinyl alcohol and borax are cross-linked to form a more stable net-shaped structure, the net-shaped structure is interwoven with cement hydrate, and a compact impermeable filter membrane is formed under pressure difference, so that water loss of cement paste is effectively controlled, fluid channeling is prevented, and the purpose of preventing fluid channeling is achieved. The silicon powder reacts with cement hydrate to form hydrated calcium silicate gel, so that the adsorption capacity can be improved, the permeability of the set cement can be reduced, and the compressive strength of the set cement can be improved. Compared with socialized products of the same type, the product provided by the invention has the characteristics of small water loss, short thickening linear transition time, high compressive strength, strong adaptability to cement and the like, and can meet the requirements of medium-temperature well cementation in different areas.
本发明公开了一种PVA类油井水泥降失水剂及其制备方法，它由以下原料的质量百分比组成：50‑65％聚乙烯醇；3‑5％交联剂，硼砂；余量为填充料，硅粉。本发明将上述含有聚乙烯醇结构的降失水剂加入油井水泥中，聚乙烯醇与硼砂发生交联形成更加稳固的网状结构，与水泥水化物交织，在压差下形成致密的不渗透滤膜从而有效控制水泥浆失水，有利于防止窜流的发生，达到“防窜”的目的。硅粉与水泥水化物反应形成水化硅酸钙凝胶，可增加吸附能力，降低水泥石的渗透率，提高水泥石抗压强度。与同类型社会化产品相比，本发明产品具有失水量小，稠化线型过渡时间短，抗压强度高，对水泥适应性强等特点，能够满足不同区域中温固井的需求。
PVA oil well cement fluid loss agent and preparation method thereof
一种PVA类油井水泥降失水剂及其制备方法
LI SHAOLI (Autor:in) / ZHAO JIANSHENG (Autor:in) / ZHOU YAJUN (Autor:in) / YAO ZHIXIANG (Autor:in) / BAO ZHENJIANG (Autor:in) / LI MUJUN (Autor:in)
17.05.2024
Patent
Elektronische Ressource
Chinesisch
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