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Oil well cement paste and horizontal well technical casing cementing process
The invention discloses oil well cement paste. The oil well cement paste comprises 1 part of oil well cement, 1.1 to 1.35 parts of saturated salt water, 0.018 to 0.03 part of oil well cement expandingagent and 0.002 to 0.003 part of coagulation accelerator. The horizontal well intermediate casing cementing process comprises the following steps that: A) a horizontal well is established, and an intermediate casing is installed into the borehole of the horizontal well until reaching the horizontal section of the horizontal well; B) oil well cement paste is injected into an annulus between the intermediate casing and the well wall of the horizontal well, and then first displacement operation is performed so as to make the oil well cement paste enter a salt bed top plate and the annulus between the intermediate casing below the salt bed top plate and the well wall, and part of the oil well cement paste is left in the intermediate casing; when the thixotropy of the cement paste is enhancedbefore the initial setting of the cement paste, second-time displacement operation is conducted, when the initial setting thixotropy of the cement paste is worst, third-time displacement operation isconducted, a part of the oil well cement paste left in the intermediate casing is ejected out every time, and a part of the cement paste is left in the intermediate casing; and C) solidification is performed. According to the method, gaps between the cement and the borehole can be greatly reduced, pressure maintaining and coagulation promoting can be completed, a light salt brine channel can be effectively sealed and isolated, well cementation quality is good, the water permeation of the salt bed top plate is prevented, and the brine concentration and the production life of a well group are guaranteed.
本发明公开了一种油井水泥浆，包括1份油井水泥、1.1‑1.35份的饱和盐水、0.018‑0.03份的油井水泥膨胀剂和0.002‑0.003份的促凝剂；本发明还公开了水平井技术套管固井工艺，包括：A）建立一水平井，将技术套管下入井眼内直至水平井的水平段；B）在技术套管与井壁之间的环空注入油井水泥浆，接着进行第一次顶替作业，使得油井水泥浆进入盐层顶板及其下方的技术套管与井壁之间的环空，技术套管内剩余部分油井水泥浆；在水泥浆初凝前触变性增强时进行第二次顶替作业，在水泥浆初凝触变性最差时进行第三次顶替作业，每次将技术套管内剩余的油井水泥浆再顶出一部分，技术套管内剩余部分水泥浆；C)凝固；本发明能大幅减少水泥与井眼的缝隙，并完成保压促凝，可有效封隔淡盐水通道，固井质量好，防止盐层顶板透水，保证井组的出卤浓度和生产寿命。
Oil well cement paste and horizontal well technical casing cementing process
The invention discloses oil well cement paste. The oil well cement paste comprises 1 part of oil well cement, 1.1 to 1.35 parts of saturated salt water, 0.018 to 0.03 part of oil well cement expandingagent and 0.002 to 0.003 part of coagulation accelerator. The horizontal well intermediate casing cementing process comprises the following steps that: A) a horizontal well is established, and an intermediate casing is installed into the borehole of the horizontal well until reaching the horizontal section of the horizontal well; B) oil well cement paste is injected into an annulus between the intermediate casing and the well wall of the horizontal well, and then first displacement operation is performed so as to make the oil well cement paste enter a salt bed top plate and the annulus between the intermediate casing below the salt bed top plate and the well wall, and part of the oil well cement paste is left in the intermediate casing; when the thixotropy of the cement paste is enhancedbefore the initial setting of the cement paste, second-time displacement operation is conducted, when the initial setting thixotropy of the cement paste is worst, third-time displacement operation isconducted, a part of the oil well cement paste left in the intermediate casing is ejected out every time, and a part of the cement paste is left in the intermediate casing; and C) solidification is performed. According to the method, gaps between the cement and the borehole can be greatly reduced, pressure maintaining and coagulation promoting can be completed, a light salt brine channel can be effectively sealed and isolated, well cementation quality is good, the water permeation of the salt bed top plate is prevented, and the brine concentration and the production life of a well group are guaranteed.
本发明公开了一种油井水泥浆，包括1份油井水泥、1.1‑1.35份的饱和盐水、0.018‑0.03份的油井水泥膨胀剂和0.002‑0.003份的促凝剂；本发明还公开了水平井技术套管固井工艺，包括：A）建立一水平井，将技术套管下入井眼内直至水平井的水平段；B）在技术套管与井壁之间的环空注入油井水泥浆，接着进行第一次顶替作业，使得油井水泥浆进入盐层顶板及其下方的技术套管与井壁之间的环空，技术套管内剩余部分油井水泥浆；在水泥浆初凝前触变性增强时进行第二次顶替作业，在水泥浆初凝触变性最差时进行第三次顶替作业，每次将技术套管内剩余的油井水泥浆再顶出一部分，技术套管内剩余部分水泥浆；C)凝固；本发明能大幅减少水泥与井眼的缝隙，并完成保压促凝，可有效封隔淡盐水通道，固井质量好，防止盐层顶板透水，保证井组的出卤浓度和生产寿命。
Oil well cement paste and horizontal well technical casing cementing process
一种油井水泥浆及水平井技术套管固井工艺
LI ZHONGFENG (author) / YIN SHUI (author) / WANG CHANGHONG (author) / LIU FEN (author)
2020-10-13
Patent
Electronic Resource
Chinese
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