Study on sealing integrity of cement sheath in ultra deep well reservoir reconstruction

Wang, Jingpeng; Zhang, Wei; Song, Lin; Wu, Jiwei; Wu, Yanxian

doi:10.1002/ese3.1479

Cited by 5 publications

(3 citation statements)

References 37 publications

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“…This phenomenon would incur pump choke and hinder further pumping of the cement slurry, thereby leading to cementing failure. Moreover, the accumulated abnormal gelatinous slurry could result in the heterogeneity of the slurry and the stratification phenomenon after setting, which seriously affects the structural integrity and sealing integrity of the cement paste . Thereby, it is of great practical significance to investigate the occurrence mechanism of the abnormal gelation behavior of the oil well cement tail slurry under a low retarder dosage.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the accumulated abnormal gelatinous slurry could result in the heterogeneity of the slurry and the stratification phenomenon after setting, which seriously affects the structural integrity and sealing integrity of the cement paste. 32 Thereby, it is of great practical significance to investigate the occurrence mechanism of the abnormal gelation behavior of the oil well cement tail slurry under a low retarder dosage. By means of XRF, XRD, XPS, SEM-EDS, TOC, and GPC, the theory of "premature hydration and crystal nucleation" was proposed to explain the abnormal gelation behavior of an oil well cement tail slurry with an insufficient dosage of retarder.…”

Section: Introductionmentioning

confidence: 99%

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Occurrence Mechanism of the Abnormal Gelation Phenomenon of High Temperature Cementing Slurry Induced by a Polycarboxylic Retarder

Xia,

Zhang,

et al. 2024

ACS Omega

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The class G oil well cement is a type of special cement that can be subjected to a high temperature formation environment. It was found that the class G cement tail slurry with a low polycarboxylic retarder dosage (usually ≤1% by weight of cement) was more prone to cause the abnormal gelation phenomenon (AGP) than the lead slurry with a high retarder dosage at a high temperature (usually when T ≥ 120 °C). This study aimed at the occurrence mechanism of this unfavorable phenomenon that seriously endangers the cementing security. Results showed that the abnormal gelatinous region underwent premature hydration; namely, the calcium hydroxide and calcium silicate hydrate (C−S−H) content were all higher than the nongelatinous region, while the copolymer content was the opposite. Correspondingly, the theory of "premature hydration and crystal nucleation" was proposed to explain the abnormal gelation mechanism of a cementing tail slurry with an insufficient retarder dosage. Furthermore, a novel functionalized copolymer retarder "PAIANS" was synthesized to alleviate the AGP.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Occurrence Mechanism of the Abnormal Gelation Phenomenon of High Temperature Cementing Slurry Induced by a Polycarboxylic Retarder

Xia,

Zhang,

et al. 2024

ACS Omega

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“…Likeswise, C annulus is next to B annulus. High annular pressure can lead to wellhead movement, 6 cement sheath crack, 7,8 and casing or tubing damage. 9,10 Taking one gas well in Sichuan Basin, China, for instance, the wellhead movement caused by high annular pressure is as large as 50 mm.…”

Section: Introductionmentioning

confidence: 99%

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Zhang,

Pan,

Cao

et al. 2023

Energy Science & Engineering

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Leakage is one of the most serious challenges for the safe production of high‐pressure gas wells for its high risks, including abnormal annular pressure, natural gas accumulation, and environment pollution, but available methods can hardly accurately measure the leakage type and depth, which are the key parameters for the rigless leakage repair and risk assessment. Therefore, this paper proposes a method to measure the leakage based on the characteristics, which combines qualitative and quantitative measurement together. Qualitative measurement considers the annular pressure, tubing pressure, liquid level, cement quality, and workover history. Quantitative measurement is determined by noise logging, electromagnetic logging, pressure logging, and temperature logging. The logging should be optimized according to the qualitative measurement. The method was successfully applied in high‐pressure gas well belonging to Tarim Oilfield. Two potential leakage types are provided based on the annular pressure, liquid level, cement quality, and workover history, including tubing leakage and linger hanger leakage. Based on the potential leakage types, the pressure difference, logging devices string, stopping length, and time are optimized to make the engineering logging reliable. Through measurement, two leakage points are found in tubing string. One is tubing body crack at the depth of 2724 m and the other is tubing thread leakage at the depth of 5211.7 m, which well matches the production data.

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Amphoteric ionic polymer large temperature difference retarder for long sealing section cementing low‐density cement slurry: Preparation, application, and working mechanism

Jinhua,

Junwei,

et al. 2024

J of Applied Polymer Sci

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In this study, a novel amphoteric ionic large temperature difference retarder (marked with CLL‐1) was prepared by using functional monomer through aqueous solution polymerization method. First, the chemical structure and molecular weight of retarder CLL‐1 were obtained, and then the thermal stability of retarder CLL‐1 was investigated at the temperature range of 40–400°C, and the result shows that the retarder CLL‐1 has well thermal stability, which could be used to control the thickening time of cement slurry at higher temperatures. Second, the influences of retarder CLL‐1 on the settlement stability of cement slurry were studied by the density difference at the temperature of 150, 120, 90, and 30°C, respectively. Third, the thickening time of cement slurry samples with different retarder CLL‐1 adding amount was studied at the temperature range of 80–180°C, and the results showed that the retarder CLL‐1 can adapt well to the working conditions of large temperature difference cementing operations. Simultaneously, the compressive strength of cement slurry with different retarder CLL‐1 adding amount was obtained. Finally, the working mechanism of retarder CLL‐1 at large temperature difference was revealed depends on the methods of x‐ray diffraction, scanning electron microscope, and TG.

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Study on sealing integrity of cement sheath in ultra deep well reservoir reconstruction

Cited by 5 publications

References 37 publications

Occurrence Mechanism of the Abnormal Gelation Phenomenon of High Temperature Cementing Slurry Induced by a Polycarboxylic Retarder

Occurrence Mechanism of the Abnormal Gelation Phenomenon of High Temperature Cementing Slurry Induced by a Polycarboxylic Retarder

Measurement of wellbore leakage in high‐pressure gas well based on the multiple physical signals and history data: Method, technology, and application

Amphoteric ionic polymer large temperature difference retarder for long sealing section cementing low‐density cement slurry: Preparation, application, and working mechanism

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