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

A cementing cement slurry and oil well cement technology, applied in the preparation of oil well cement settlement stabilizer, cementing cement slurry field, can solve the problems of poor cementing quality, difficult pumping, unstable performance of cement slurry, etc.

Active Publication Date: 2019-03-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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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

Method used

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

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preparation example Construction

[0069] In the present invention, a rigid hydrophobic monomer is developed by increasing the length of the alkyl chain in the monomer, and the rigid hydrophobic monomer is a rigid hydrophobic long-chain alkyl monomer, which can endow the The thermal viscosity-increasing ability of synthetic polymers, so the present invention utilizes allyl chloride and N, N-dimethyl long-chain alkyl tertiary amines (the number of long-chain alkyls is an even number of 14-20) to synthesize a rigid hydrophobic long-chain The alkyl-containing quaternary ammonium salt type monomer is used as a rigid hydrophobic monomer, and the specific synthesis method includes the following steps:

[0070] (1) Add fatty alcohol and an appropriate amount of catalyst into the reactor, heat the reactor, and when the temperature is 130°C, feed monomethylamine into the reactor at a flow rate of 35kg / h-50kg / h for 75-85min, and finally the reactor Keep the reaction temperature at 180-200°C, and the reaction time is 5-7h...

Embodiment 1

[0103] This embodiment is to illustrate the oil well cement settlement stabilizer prepared by the method of the present invention.

[0104] Weigh 1 part by weight of 2-acrylamido-2-methylpropanesulfonic acid, 3 parts by weight of acrylamide, and 1 part by weight of rigid hydrophobic monomer, and dissolve all three monomers in deionized water , to form a mixed solution after stirring evenly;

[0105] Wherein, the rigid hydrophobic monomer has the structure shown in formula (VI), and, R 6 is H, m is 21;

[0106]

[0107] Adding a mass fraction of 10% NaOH solution to the mixed solution to adjust the reaction system to a pH of 8.5, place the mixed solution with a good pH value in a three-necked flask, discharge the oxygen in the three-necked flask and place the three-necked flask at 50 ° C. Stirring at a constant speed of 100r / min in a water bath, until the temperature of the reaction solution rises to 50°C, slowly add successively dropwise an initiator solution with a mass ...

Embodiment 2

[0113] This embodiment is to illustrate the oil well cement settlement stabilizer prepared by the method of the present invention.

[0114] Prepare the oil well cement settlement stabilizer according to the same method as in Example 1, the difference is: take 2 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 3 parts by weight of acrylamide according to the weight ratio, 1 part by weight of rigid hydrophobic monomer.

[0115] As a result, the prepared oil well cement settlement stabilizer is marked as S2;

[0116] Wherein, the structure contained in the oil well cement settlement stabilizer S2 is:

[0117] [CH 2 CM 1 H] x -[CM 2 HCH 2 ] y -[CH 2 CM 3 HCl - ] z ; among them, M 1 for-CONH 2 ,M 2 for-CONHC(CH 3 ) 2 CH 2 SO 3 H, M 3 for-[NCH 2 (CH 3 ) 2 (CH 2 ) m CH 3 ] + ;

[0118] where x:y:z=1:0.22:0.055; and

[0119] The weight average molecular weight of the oil well cement settlement stabilizer S2 is 5 million.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F226/02C09K8/467
CPCC09K8/467C08F220/56C08F220/585C08F226/02Y02W30/91
Inventor 王成文王桓薛毓铖王瑞和郭胜来
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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