Evaluation device and method capable of eccentricity testing of cementation quality of well cementation first interface
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A technology of quality evaluation and interface glue, applied in construction and other directions, can solve problems such as failure to reflect formation pore pressure, inability to distinguish and study, and ignoring casing.
Active Publication Date: 2017-05-31
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Liao Hualin proposed a test device and experimental method for evaluating the cementation status by measuring the sealing properties of the cement sheath (Liao Hualin, Guan Zhichuan, Shi Yucai, etc. A simulation test device for the sealing properties of the cement sheath in oil and gas wells [P]. Shandong: CN204024635U, 2014-12-17.), the device and method are to test the channeling of two cemented interfaces at the same time, and it is impossible to distinguish and study which interface has channeling; Guo Xiaoyang proposed a high-temperature and high-pressure one-two-two A cementing ability evaluation device for a cemented interface (Guo Xiaoyang, Zhang Kai, Li Zaoyuan, etc. High temperature and high pressure cementing first and second interface sealing ability testing device and method [P]. Sichuan: CN104406910A, 2015-03-11.), the Although the mud cake is formed in the device, it does not reflect the drilling fluid circulation process. Although the confining pressure is applied in th
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Embodiment 1
[0038] A cementing-interface bonding quality evaluation device capable of eccentric testing, mainly composed of a casing inlet 1, an annular air inlet 2, wool pads 3, 4, annular sealing rings 5, 18, a lower cover 6, a lower Adjusting screw 7, lower kettle body 8, pressure screw 9, screw translation groove 10, side kettle body 11, heating insulation cover 12, stratum simulation layer 13, casing 14, upper kettle body 15, upper adjusting screw 16, upper cover 17. Second interface gas outlet 19, first interface gas outlet 20, casing gas outlet 21, spacer ring 22, drilling fluid pool 23, control valves 24 (first), 26 (second), 27 (third) , 28 (fourth), 29 (fifth), 33 (sixth), 44 (seventh), 45 (eighth), mud pump 25, back pressure valve 30 (first), 31 (second), 32 (third), pressure gauge 34 (first), 35 (second), 36 (third), 48 (fourth), 49 (fifth), 50 (sixth), flow meter 37 (first ), 38 (the second), 39 (the third), gas cylinder 40 (the first), 41 (the second), 42 (the third), compu...
Embodiment 2
[0056] Adopt the experimental method of the evaluation device of a kind of cementing second interface cementing quality described in embodiment 1, comprise the steps:
[0057] 1. Adjust the eccentricity:
[0058] (1) Take off the upper cover 17 and the lower cover 6, connect the casing 14 and the lower cover 6, and seal the joints of the two with rubber rings, and then connect the lower cover 6 to the Lower kettle body 8, now pressure-bearing screw 9 needn't be tightened.
[0059] (2) Turn the lower adjustment screw 7. Since the pressure-bearing screw 9 is not tightened, the casing 14 will translate the same distance with the lower cover 6 at this time, and can be adjusted to the eccentricity required for the experiment.
[0060] (3) Immediately tighten the pressure-bearing screw 9 after reaching the eccentricity required for the experiment, and seal the connection between the upper cover 17 and the casing 14, and tighten the corresponding pressure-bearing screw.
[0061] 2....
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Abstract
The invention discloses an evaluation device and method capable of eccentricity testing of cementation quality of a cement-casing interface. The cement-casing interface is a well cementation first interface. Currently, evaluation of the first interface only considers the cementation situation of the outer surface of a casing and a cement ring, however, in a realistic multi-drilled well bore structure, cementation exists between the inner surface of the casing and the cement ring, and the cementation quality between the inner surface of the casing and the cement ring also determines the success or not of cement ring sealing. Besides, when consideration is given to the inner and outer surfaces, consideration also needs to be given to the influence of eccentricity of the casing on cementation. Aiming at the problems, according to the solving scheme, the technology and working condition well cementation on the spot are simulated as far as possible, including forming of mud cake, washing, downhole maintenance of cement, downhole pressure and temperature and the like. The evaluation device and method capable of eccentricity testing of cementation quality of the cement-casing interface are high in simulation degree, can evaluate the cementation situation of the outer surface of the casing and the cement, can simulate the casing cementation situation of random degrees of eccentricity, and can simulate the plugging strength of slug injection of colloids of cement paste and the like. An experimental result and analysis can provide important reference for the evaluation of cementation quality of the well cementation first interface, provide important basis for an engineering design, and can be applied to the evaluation of cementation strength of other material systems and the casing as well.
Description
technical field [0001] This patent relates to the evaluation of the first cementing interface of oil and gas well cementing, that is, the casing and cement sheath interface. It can simulate the complete cementing process under high temperature and high pressure and the working condition of any eccentricity of the casing, and can use the gas channeling method to evaluate the casing. Cementation of the cement sheath on the inner and outer surfaces. Background technique [0002] The first interface of cementing is the cemented interface between the casing and the cement sheath. Its good cementation can effectively protect the casing and prevent formation channeling. If channeling occurs at the first interface, it will not only affect the safety of production, but also make the fluid in the formation directly contact with the casing, which will accelerate the damage of the casing and cause safety hazards in fracturing and acidizing measures. Therefore, it is of great significan...
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