Experimental study of the movement of control fluid in compound perforation

Zhao, Xu; Liu, Gonghui; Li, Jun; Ding, Qingxin

doi:10.1007/s12182-009-0059-z

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Lu et al [9] proposed a perforation pressure equation based on reservoir conditions by using the superposition principle, with preliminary theoretical derivation and qualitative analysis. Zhao et al [10,11] qualitatively studied the characteristics of perforation pressure fluctuation in the process of composite perforation by combining theoretical research with experimental tests. Chen et al [12] analyzed the dynamic load of downhole perforation by using theoretical empirical formula and simulation software.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Downhole Perforation Pressure for a Deepwater Well

Qiao

Zhang

et al. 2019

Energies

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During the production of deepwater wells, downhole perforation safety is one of the key technical problems. The perforation fluctuating pressure is an important factor in assessing the wellbore safety threat. Due to difficulty in describing the downhole perforation pressure by using the existing empirical correlations, a prediction model based on data fitting of a large number of numerical simulations has been proposed. Firstly, a numerical model is set up to obtain the dynamic data of downhole perforation, and the exponential attenuation model of perforation pressure in the wellbore is established. Secondly, a large number of numerical simulations have been carried out through orthogonal test design. The results reveal that the downhole perforation pressure is logarithmic to the total charge quantity, increases linearly to the wellbore initial pressure, shows an exponential relationship with downhole effective volume for perforation, and has a power relationship with the thickness of casing and cement as well as formation elastic modulus. Thirdly, the prediction of perforation peak pressure at different positions along the wellbore agrees well with the field measurement within a 10% error. Finally, the results of this study have been applied in the field case, and an optimization scheme for deepwater downhole perforation safety has been put forward.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Downhole Perforation Pressure for a Deepwater Well

Qiao

Zhang

et al. 2019

Energies

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Study of dynamic pressure on the packer for deep-water perforation

2021

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The packer is one of the most important tools in deep-water perforation combined well testing, and its safety directly determines the success of perforation test operations. The study of dynamic perforating pressure on the packer is one of the key technical problems in the production of deep-water wells. However, there are few studies on the safety of packers with shock loads. In this article, the three-dimensional finite element models of downhole perforation have been established, and a series of numerical simulations are carried out by using orthogonal design. The relationship between the perforating peak pressure on the packer with the factors such as perforating charge quantity, wellbore pressure, perforating explosion volume, formation pressure, and elastic modulus is established. Meanwhile, the database is established based on the results of numerical simulation, and the calculation model of peak pressure on the packer during perforating is obtained by considering the reflection and transmission of shock waves on the packer. The results of this study have been applied in the field case of deep-water well, and the safety optimization program for deep-water downhole perforation safety has been put forward. This study provides important theoretical guidance for the safety of the packer during deep-water perforating.

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Safety Distances of Packers for Deep-Water Tubing-Conveyed Perforating

Qiao

Zhang

Jun

et al. 2018

Day 4 Thu, May 03, 2018

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The technologies of high density and high charge perforator are widely used in the perforation jobs of deep-water wells, resulting in a large increase of impact loads in the wellbore. Determining the safety distances between the packers and the perforating gun is a critical step for developing completion designs of deep-water. This paper examines the processes of pressure wave generation, attenuation and reflection propagating through the completion fluid during wellbore perforation and develops a calculation model to formulate safety distances of the packers to protect the non-perforated wellbore. A calculating model containing an unknown function is established, which is used to solve the safety distances of packers and a mathematical model based on numerical simulation results is proposed to predict the peak pressure on the perforating gun, which can evaluate the sensitivity of peak pressure to changes under different conditions of perforation. The complete calculating model for determining the safety distances of packers is finally created. The results of case study show that the predicted peak pressure by the model is accurate, within 10% of measured values by a pressure sensor installed at the bottom of the perforating gun during a well completion job within the South China Sea. This calculating model indicates that the attenuation law of the pressure wave propagation in the completion fluid basically accords with the exponential attenuation mode, which is verified by the data of underwater explosion experiment. The number of perforating bullet, charge per hole, tubing length, formation pressure and wellbore pressure are important factors of the safety distances. According to the numerical simulation results of the field example, the shock absorber has the optimal installation position, which the ratio R0/R=0.6 being the best shock absorption effect can be achieved. This study proposes a novel method for the safety distances design of packers and the location of the absorber is optimized, which has important significance to provide guidance for the design of deep-water perforating operations and to improve security.

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Experimental study of the movement of control fluid in compound perforation

Cited by 3 publications

References 5 publications

Numerical Investigation of Downhole Perforation Pressure for a Deepwater Well

Numerical Investigation of Downhole Perforation Pressure for a Deepwater Well

Study of dynamic pressure on the packer for deep-water perforation

Safety Distances of Packers for Deep-Water Tubing-Conveyed Perforating

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