Oil well cement sedimentation stabilizer suitable for oil and gas well cementation, preparation method thereof and cementing slurry

Abstract

The invention belongs to the field of petroleum and natural gas well cementation projects and particularly relates to an oil well cement sedimentation stabilizer suitable for oil and gas well cementation, a preparation method thereof and a cementing slurry. The oil well cement sedimentation stabilizer contains structural unit A shown as formula (I), structural unit B shown as formula (II) and structural unit C shown as formula (III). The molar ratio of the structural units A, B and C is x:y:z=1:(0.07-0.22):(0.03-0.11); in the formulas, R1, R2 and R3 are H, or C1-C4 is substituted or non-substituted alkyl group, and m is 15, 17, 19 or 21. The oil well cement sedimentation stabilizer allows zero thickening at low temperature and thickening at high temperature; the problem that the cementingslurry settles and loses stability is effectively solved.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas well cementing engineering, and in particular relates to an oil well cement subsidence stabilizer suitable for oil and gas well cementing, a preparation method of an oil well cement subsidence stabilizer suitable for oil and gas well cementing, and a method comprising the Cementing cement slurry for oil well cement settlement stabilizer. Background technique [0002] In recent years, with the increasing demand for my country's oil and gas resources, the contradiction between oil and gas supply and demand has become increasingly prominent. In order to solve this contradiction, while appropriately increasing oil imports, the exploration and development of my country's oil and gas resources are directed towards deep water, deep formations and unconventional oil and gas. In the direction of development, extended reach wells and horizontal wells are being used more and more, which poses more cha...

AI Technical Summary

Problems solved by technology

However, under high temperature conditions, the polymer will undergo three types of degradation reactions: depolymerization, random chain scission, and group removal, which will reduce its molecular weight, thereby reducing the viscosity of the system and losing its structural force and suspension ability. In addition, high molecular weight Polymers can also cause poor flow properties of cement slurry and affect normal pumping

[0006] Zhang Hao, Li Houming and others (Zhang Hao. Research and application of SS-10L stable suspension agent for well cementing [J]. Science Technology and Engineering, 2014.), developed a suspension stabilizer for oilfield cementing, by Wen Lun Glue is used as an organic suspending component, mineral B is used as an inorganic suspending component, and surfactant C is composed. Experimental results and field applications show that the addition of this suspension stabilizer is extremely low, and it has good compatibility with admixtures and is cost-effective. However, the temperature resistance is poor, which makes the cement slurry thicken at low temperature and thin at high temperature

Xia Chun et al. (Xia Chun, XaiChun. ACS research on the action mechanism of new grouting stabilizers [J]. Chinese Journal of Civil Engineering, 2005, 38 (6): 89-91.), developed a polyacrylamide and acrylic acid bonded The ACS cement slurry stabilizer, which is composed of branch copolymers and inorganic chemical materials and other components, belongs to the polymer surfactant. The results show that the ACS cement slurry stabilizer can significantly improve the strength of cement stone. The effect is particularly obvious, but the effect is not obvious when the water-cement ratio is high

[0007] CN107162512A discloses an ultra-deep well high temperature resistant cement slurry system, including cement, high temperature fluid loss reducing agent, silica sand, high temperature retarder, high temperature stabilizer and dispersant, by adding high temperature resistant admixture, it solves the problem of cement slurry under high temperature. Problems with inconsistent performance, but increased difficulties in pumping the slurry due to the initial consistency of the slurry

[0008] Due to the general shortage of traditional oil well cement settlement stabilizers currently used, excessive thickening at low temperature makes pumping difficult, while high temperature hydrolysis becomes thinner, and settlement stability decreases rapidly, resulting in poor cementing quality or even failure

Therefore, there is still no good solution to the problem of settlement instability of cement slurry, especially with the increase of complex structure wells such as deep wells, horizontal wells, and extended-reach wells, the problem of settlement instability of oil well cement slurry will become More prominently, in the prior art, anti-settlement of cement slurry is still the technical bottleneck of research at home and abroad, therefore, the synthesis of a new type of oil well cement subsidence stabilizer still needs further research and development

Images