Pore pressure evaluation of formation testing while drilling under supercharged conditions

Peng, Nian; Ma, Tianshou; Chen, Ping; Liu, Yang

doi:10.1016/j.petrol.2021.108689

Cited by 14 publications

(4 citation statements)

References 14 publications

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“…However, during the drilling and completion of the infill adjustment well, affected by the surrounding geological conditions and injection-production wells, the formation pressure near the adjustment well may be in an overpressure or underpressure state, leading to complicated situations and accidents such as leakage and overflow. This can be seen from the pressure measurement while drilling data (Ma et al 2018;Peng et al 2021) (Fig. 1).…”

Section: Introductionmentioning

confidence: 84%

Design method and application of accurate adjustment scheme for water injection wells around adjustment wells

Hao

Zhong

Liu

et al. 2021

J Petrol Explor Prod Technol

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Affected by the surrounding injection and production wells, the formation near the infill adjustment well is in an abnormal pressure state, and drilling and completion operations are prone to complex situations and accidents such as leakage and overflow. The conventional shut-in method is to close all water injection wells around the adjustment well to ensure the safety of the operation, but at the same time reduce the oil field production. This paper proposes a design method for shut-in of water injection wells around adjustment wells based on injection-production data mining. This method uses water injection index and liquid productivity index as target parameters to analyze the correlation between injection and production wells. Select water injection wells with a high correlation and combine other parameters such as wellhead pressure and pressure recovery speed to design accurate adjustment schemes. Low-correlation wells do not take shut-in measures. This method was applied to 20 infill adjustment wells in the Penglai Oilfield. The correlation between injection and production wells was calculated using the data more than 500 injection wells and production wells. After a single adjustment well is drilled, the surrounding injection wells can increase the water injection volume by more than 5000 m3. This method achieves accurate adjustment for water injection wells that are high correlated with the adjustment well. Under the premise of ensuring the safety of drilling operations, the impact of drilling and completion on oilfield development is minimized, and oilfield production efficiency is improved. It has good application and promotion value.

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Section: Introductionmentioning

confidence: 84%

Design method and application of accurate adjustment scheme for water injection wells around adjustment wells

Hao

Zhong

Liu

et al. 2021

J Petrol Explor Prod Technol

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“…Pore pressure (PP) is one of the most prominent and widely used parameters in various petroleum fields, from the start of drilling to determining and optimizing the production of oil and gas flow as well as reservoir planning (Ma et al, 2015). The high importance of this parameter in reservoir engineering, exploitation, and drilling has sparked the interest of several authors in researching such an important parameter (Peng et al, 2021). This very important parameter is measured and reported through direct measurement of PP using the Modular Formation Dynamics Tester (MDT) (Carnegie et al, 2002;Baouche et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Application of GMDH model to predict pore pressure

et al. 2023

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Pore pressure (PP) is one of the essential and very critical parameters in the oil and gas industry, especially in reservoir engineering, exploitation, and production. Forecasting this valuable parameter can prevent huge costs incurred by the oil and gas industry. This research aims to develop a algorithm to better predict PP in subsurface -formations. Based on this, information from three wells (F1, F2, and F3) representing one of the Middle East oil fields was used in this research. The input variables used in this research include; laterolog (LLS), photoelectric index (PEF), compressional wave velocity (Vp), porosity (NPHI), gamma ray (spectral) (SGR), density (RHOB), gamma ray (corrected) (CGR), shear wave velocity (Vs), caliper (CALI), resistivity (ILD), and sonic transit time (DT). Based on the results presented in the heat map (Spearman’s correlation), it can be concluded that the pairs of parameters RHOB-PEF, CGR-SGR, RHOB-CALL, DT-PEF, PP-RHOB, Vs-RHOB, ILD-LLS, DT-CGR, and DT-NPHI are connected. In this research the GS-GMDH methods is used for modeling which is based on the Group method of data handling (GMDH). The results of this research show that this algorithm has an average error of RMSE = 1.88 Psi and R2 = 0.9997, indicating its high-performance accuracy. The difference between this method and the conventional GMDH method is that it can use three or more variables instead of two, which can improve prediction accuracy. Furthermore, by using the input of each neuron layer, the proposed model can communicate with other adjacent and non-adjacent layers to solve complex problems in the simplest possible way.

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“…As the depth of mining increases, deep mining faces the problems of high geotemperature, high hydraulic pressure, high ground stresses, and mining disturbance, among which high pore water pressure is an important factor [1][2][3]. In the oil and gas industry, pore pressure is generated by the fluid in the pores and fractures of rock mass during reservoir diagenesis [4,5]. Long-term pore pressure can lead to damage within the original rock [6] and a corresponding change in the physical characteristics of the rock mass, which makes the reservoir formation environment more complex and difficult to extract.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effect of Evenly Distributed Pore Pressure on Rock Damage

et al. 2022

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The effect of pore pressure on rock damage is a core problem in underground engineering. In this paper, the pseudotriaxial hydromechanical coupling experiment system is utilized to carry out the physical model experiment of the pore pressure on the rock damage, and the effect of evenly distributed pore pressure on rock strength and pore structure is analyzed. Compared with natural rock sample before the pore pressure effect, the uniaxial compressive strength is reduced by about 35.24%. Pore pressure decreases the strength of the rock and reduces its ability to resist deformation. The stress growth rate at the prepeak stage of the stress-strain curve for rock sample after pore pressure effect decreases. The peak strength decreases, and the strain corresponding to the peak stress increases. The plastic deformation characteristics of the sample are obvious. After the sample has macroscopically broken, the decline rate of postpeak stress slows down, and the residual strength decreases. The rock gradually changes from brittle failure mode to ductile failure mode. Through scanning electron microscopy (SEM) test and comparison analysis, it is found that after the pore pressure effect, the surface of the rock sample becomes rougher. There are multiple pore and fissure concentrated areas in the rock sample. Compared with the sample before the pore pressure effect, the number of pores with an equivalent diameter in the range of 2 μm-3 μm increases significantly. The proportion has increased from 7.7% to 19.1%, and the number has increased from 1468 to 4454. A large number of small-sized pores (less than 3 μm) are generated in the rock sample after the pore pressure effect. Therefore, the overall pore content of the rock sample increases.

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Pore pressure evaluation of formation testing while drilling under supercharged conditions

Cited by 14 publications

References 14 publications

Design method and application of accurate adjustment scheme for water injection wells around adjustment wells

Design method and application of accurate adjustment scheme for water injection wells around adjustment wells

Application of GMDH model to predict pore pressure

Experimental Investigation of the Effect of Evenly Distributed Pore Pressure on Rock Damage

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