期刊,Journal of Petroleum Science & Engineering 2022年215PA卷期_国家学术搜索

期刊信息/Journal information

Journal of Petroleum Science & Engineering

Elsevier Science B.V.

主办单位：Elsevier Science B.V.

国际刊号：0920-4105

Journal of Petroleum Science & Engineering/Journal Journal of Petroleum Science & Engineering

正式出版

收录年代

Formulation of novel ecofriendly microemulsion-based drilling fluids for improving rheological and nitration characteristics

Giovanna L.R. LealAlfredo I.C. GarnicaRaphael R. Silva

8页

查看更多>>摘要：The main objective of this work was to formulate not environmentally harmful drilling fluids obtained from microemulsion systems, using an aqueous phase (water-glycerol solution 1:1), an oil phase (pine vegetable oil), and varying nonionic surfactants (Tween 80, nonylphenol ethoxylates 100 and 150). Two types of clays (filtration control) were used in the formulation of fluids, Brasgel PA and Cloisite 20 A, in the presence of a viscosifier (xanthan gum), a weighting agent (baritine), a sealant (calcite), and dispersant (water). Properties such as mass loss, filtrate volume, and rheological characteristics of the formulated fluids were analyzed since these are considered essential characteristics for a successful drilling operation. Shear stress (x) versus shear rate (s_1) data of fluids was best fitted to the Herschel-Bulkley rheological model with R2 of 0.99. The fluids formulated with Brasgel PA obtained the lowest consistency index (k), ranging from 0.37 to 0.61, and, therefore, the force required to start the flow (tA The thermogravimetric analysis verified that the microemulsified drilling fluids obtained can operate at temperatures up to 100 °C, making it possible to apply them in oil wells with these thermal characteristics. The fluids' filtrate loss volume varied from 2.4 mL to 4.0 mL;; the maximum filtercake thickness measured 0.80 mm, and low permeability (0.0173 mD). The analyzed drilling fluids showed a significant swelling reduction when formulated with the microemulsion systems and improved lubricity. In general, it was observed that ecofriendly microemulsion-based drilling fluids were efficient in reducing swelling, showing good rheological and reduced API filtrate loss, being viable alternatives for use in drilling operations of oil wells.

原文链接:

NSTL

Recent advances of modified polyacrylamide in drilling technology

Jin Kwei KohChin Wei LaiMohd Rafie Johan

19页

查看更多>>摘要：Several factors shall be considered in the drilling, such as constituent selection, pile selection, cost, environment, and safety considerations. In conventional water-based drilling fluids, bentonite, natural polymer, and synthetic polymer were discovered in the past. There are many drawbacks to the use of bentonite, natural polymer, and synthetic polymer. Consequently, polymer modification is required in drilling nowadays. The modified polyacrylamide reviewed in this paper is a polymer aqueous solution with high molecular weight, which has a similar density as water but a much higher viscosity. Further, it is a water-soluble, easily mixed dry granular, and non-gelling agent. Compared to bentonite, the modified polyacrylamide can contribute to many environmental and operational advantages such as a smaller site footprint, ease of mixing, cheaper disposal cost, and less pollution. Therefore, we review recent achievements regarding polymer modification incorporated with several dopants like carbon nanotubes. zeolite, silica, and graphene oxide. Further, the water volume, thermal stability, pH and cutting effect on the polymer nanocomposite have been reviewed. Future prospects and challenges are inadequate knowledge of innovative modified towards in-situ soil, the optimisation study of modified polyacrylamide in drilling fluid as well as the empirical study of shaft friction and base resistance for innovative polymer nanocomposite in bored pile design. Indeed, modified polyacrylamide drilling fluid has been proven to be of great interest for use in the construction of bored piles and diaphragm walls in recent years.

原文链接:

NSTL

Dolomite genesis and dolomitization mechanisms of the Ordovician lower Yingshan Formation, Gucheng area, Tarim Basin, China

Ying BaiWei LiuWanglin Xu

17页

查看更多>>摘要：The massive dolomite reservoirs of the Ordovician formations in the Tarim Basin have significant gas exploration potential, but their occurrence and distribution are not clearly understood. This study collected core samples covering regional dolomite reservoirs from the lower Yingshan Formation in the Gucheng area. A combination of petrology, fluid-inclusion assemblage (FIA) microthermometry, and isotope geochemistry data were used to define the dolomitization process and its impact on reservoirs. Petrological and geochemical analyses reveal that various dolomites have different dolomitization mechanisms. In (pene)contemporaneous (PC) stage, on the western side of the east Tarim Platform, laminated dolomicrite (LDm) of the third Member (3rd Mm) was formed by microbial and sabkha dolomitization, whereas dolomicrite (Dm) of the fourth Member (4th Mm) generated from sabkha dolomitization in the slightly elevated salinity setting in an evaporative sea environment. The residual structural dolomite (RSD) of the 3rd and 4th Mm was characterized by reflux fluids on the central platform margin. The shallow-middle burial (SMB) stage was dominated by reflux dolomitization, precipitated structureless dolomite (SD) primarily associated with RSD. Bimodal geochemical characteristics indicate that dolomitizing fluids gradually transitioned to pore water consisting of evaporated seawater reserved in the strata. In the middle-deep burial (MDB) stage, hydrothermal burial effects were superimposed and transformed the dolomites near the fractures. Leopard dolomite (LD) in the 4th Mm is limited to faults and has seawater and hydrothermal geochemical characteristics, controlled by the superimposition of pore water in SMB stage and hydrothermal fluids in MDB stage. Massive dolomite (MD) in 3rd Mm, which is not completely limited to the fracture system, was derived from multiple superimposed dolomitization events and transformed by terrestrial water. Finally, the effect of dolomitization on reservoirs was investigated. It is concluded that the sabkha and reflux dolomitization in PC stage was the primary dolomitization mechanism and was the basis for the pore formation.

原文链接:

NSTL

A novel and efficient dimensionality-adaptive scheme for logging-while-drilling electromagnetic measurements modeling

Guoyu LiZhenguan WuXizhou Yue

10页

查看更多>>摘要：Logging-while-drilling (LWD) electromagnetic (EM) measurements have been developed and increasingly used to place the oil/gas wells in formations for decades. Successfully implementing the technology in geosteering and reservoir evaluation highly depends on the efficiency and accuracy of data processing. The ability to accurately image the formation structures around horizontal wells has increased dramatically with advances in forward/inversion algorithms. However, the current fixed-dimension modeling methods are unable to balance the tradeoff between the efficiency and accuracy of the EM LWD simulation. For this reason, we propose a dimensionality-adaptive scheme that combines the advantages of low dimensional algorithms (semi-analytic) and high dimensional algorithms (2.5D) to enhance the efficiency and accuracy of the modeling. The new scheme is able to select the proper model dimension and invoke its corresponding algorithm automatically. By applying the developed size-adaptive sliding-window method, a complex 2D model can be converted to a series of ID models for a single record point. The model control factor and the cross-dimension factor are further defined to quantitatively evaluate the model simplification feasibility. The former analyzes the formation structure complexity, while the latter estimates the simplification accuracy by comparing the results from the obtained ID models. A 2D example is presented to showcase the effectiveness and accuracy of the dimensionality-adaptive scheme. Numerical results show that the defined factors are feasible to quantitatively evaluate the simplification rationality. The novel dimensionality-adaptive scheme is more efficient and accurate compared to the fixed-dimension algorithm, which can be used for both pre-drilling modeling and real-time inversion.

原文链接:

NSTL

Fuzzy logic for control of injector wells flow rates under produced water reinjection

Rewbenio A. FrotaRicardo TanscheitMarley Vellasco

13页

查看更多>>摘要：Production water reinjection (PWRI) has been a mandatory practice for waste disposal for economic and environmental reasons. However, PWRI is associated with severe injectivity decline. Therefore, maximizing injection rates under PWRI while keeping wells' injectivity above a minimal level is a real challenge. Preserving the well's injectivities is vital to prevent frequent cleaning operations and avoid drilling new disposal wells. Human-based control strategy has proven ineffective under PWRI, as it gives enough time for severe injectivity impairment to develop. Therefore, the dynamic and potentially nonlinear nature of PWRI is ideal for a data-driven strategy. Fuzzy Logic (FL) can be the natural transition from human to automatic control. FL synthesizes all injection dynamics in simply linguistic interpretable terms and implements control rules easily explainable to human operators. Besides, it can handle nonlinear dependencies intrinsically. FL and other Machine Learning (ML) methods have been applied to regular waterflooding problems, such as optimizing well positions to maximize injected volumes or pressure maintenance. However, the issue of injectivity maintenance under PWRI has not yet tested the power of these technologies. This paper proposes a data-driven strategy based on ML and FL to determine injection rates for wells in a sandstone reservoir. It establishes an automatic intelligent, adaptive, and folly interpretable system to determine the best possible flow rates for any number of wells while preserving wells' injectivity. In addition, we propose proxy models to identify the complex dynamical behavior of the wells instead of time-consuming reservoir simulations. A pilot experiment with several wells evaluates the proposed model. Our results demonstrate the potential of the method to deliver higher injection rates reducing severe injectivity losses.

原文链接:

NSTL

Study on evaluation method of fracture forming ability of shale oil reservoirs in Fengcheng Formation, Mahu sag

Zixuan YangXiaoqiong WangHongkui Ge

12页

查看更多>>摘要：In order to effectively evaluate the complex fracture network forming ability of Fengcheng Formation shale oil reservoirs in Mahu sag, the core in a vertical well of Fengcheng Formation in Mahu sag was considered as the research object. Through coring sampling, indoor experimental testing, combined with logging data and comprehensive interpretation, the rock mechanical properties and in-situ stress profile of the reservoir are systematically obtained. The results show that the shale oil reservoir of Fengcheng Formation in Mahu sag has deep burial depth, large absolute value of in-situ stress, high compressive strength and elastic modulus, good brittleness. low development degree of reservoir bedding, but relatively developed natural fractures. Among these features, brittleness, natural fractures, compressive strength and in-situ stress are the main controlling factors affecting the reservoir fracture propagation. The acoustic emission b value during the process of rock fracture can characterize the ability to form complex fracture network. By evaluating the correlation coefficient between each main control factor and acoustic emission b value for the first time, the weight value of each factor on fracture forming ability is determined. So as to establish the quantitative evaluation model of reservoir fracture forming ability, and quantitatively evaluate the fracture forming ability of the reservoir section. Applying the quantitative evaluation model of fracture forming ability to the logging data of the well. The evaluation results of the whole well section are consistent with the liquid production profile of the well, which shows that the research model established by this method is reliable. That also provides a guidance for the fracturing transformation and horizon optimization of horizontal wells in Fengcheng Formation shale oil reservoir in Mahu sag in the later stage.

原文链接:

NSTL

Comparative study on pore structure characteristics of marine and transitional facies shales: A case study of the Upper Permian Longtan Formation and Dalong Formation in the Lower Yangtze area, south China

Zhongrui WuSheng HeXincheng Li

19页

查看更多>>摘要：The Permian shale reservoir in the Lower Yangtze area of South China is regarded as a target with a high potential for shale gas exploration. To investigate the pore structure characteristics and evaluate reservoir qualify, 32 shale samples from the Upper Permian Longtan Formation and Dalong Formation in the Lower Yangtze area were studied using a suite of techniques including total organic carbon (TOC) content, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), nitrogen (N2) and carbon dioxide (CO2) gas physisorption. mercury injection capillary pressure (MICP), petrographic observations, and fluid inclusion analysis. Petrographic observations reveal that the Longtan Formation is rich in vitrinite and inertinite. while the Dalong Formation contains a large amount of solid bitumen. Primary organic pores (POPs) are the original cellular pores that develop in inertinite. Vitrinite particles did not show visible pores. Solid bitumen infills fractures and occupies the interparticle (interp) space between the mineral grains in the Dalong Formation. A small number of speckled secondary organic pores (SOPs) were observed in the solid bitumen with diameters less than 10 nm. Both the TOC and quartz contents exhibit negative relationships with the pore volumes (PVs) for the Longtan and Dalong Formations, owing to the poor development of pores in the organic matter (OM) and occlusion of most mineral pores by migrated bitumen. There is a positive relationship between clay minerals and PVs owing to the sheet-like meso-pores and macro-pores in the clay minerals. The evolution of organic porosity is related to the differences in maceral composition and thermal maturity. Thermal cracking of residual oil and bitumen and the expulsion of gaseous hydrocarbons contributed to the formation of SOPs in marine shales. In contrast, vitrinite and inertinite in gas-prone shales do not display noticeable morphological changes across the entire thermal evolution process, owing to their low hydrocarbon generation potential.

原文链接:

NSTL

Diagenesis and controlling factors of Oligocene Huagang Formation tight sandstone reservoir in the south of Xihu sag, the East China Sea Shelf Basin

Wendao QianQiliang SunStuart J.Jones

19页

查看更多>>摘要：Considerable amounts of efforts have been made in search of depositional sand quality and diagenetic processes on the quality of low-permeability and tight reservoirs mainly due to the realization that these multiple factors exert profound controls on reservoir quality. This study evaluated the role played by original components and diagenetic processes on reservoir quality evolution of Oligocene Huagang Formation reservoir in the south of Xihu sag from braided river delta (H3, H4 and H5) to meandering river delta (H6 and H7). By a multi-disciplinary approach of thin section identification, scanning electron microscopy, grain size analysis, mineral phase analysis, and X-ray diffraction, the penological characteristics, grain structure, and diagenesis of five of the layers (H3, H4, H5, H6, and H7) of Huagang Formation in the Western slope belt (WSB), the Western sag (WS) and the Central uplift belt (CUB) were studied. It was determined that the reservoirs are mainly composed of fine-medium sandstone (94.1%) and feldspathic lithic quartz sandstone (Q_(65.6)F_(15.8)L_(18.6))-The E3H reservoirs in WSB and CUB III structural belt are of conventional types with an average porosity of 13.2% and permeability of 30 x 10 μm , and reservoirs in WS, CUB I and CUB II are mainly tight sand with an average porosity of 7.8% and permeability of 2.9 x 10 μm~2 . Furthermore, quantified characterization of diagenetic factors on porosity was revealed by multiple regression analysis to find out the depositional and diagenetic controls on reservoir quality. The effect of sorting, grain size, rigid lithic fragment, argillaceous content, compaction and feldspar dissolution have been identified as main contributing factors for reservoir quality evolution of E3I1 sandstones, notably post-depositional processes on the deep (3500-4500 m) and ultra-deep (>4500 m) tight sandstone reservoirs (DUDTSR) with high degree of diagenetic stage. Therefore, a better understanding of diagenesis will provide an efficient approach for evaluation and prediction of the DUDTSR.

原文链接:

NSTL

Experimental study on plugging performance and diverted fracture geometry during different temporary plugging and diverting fracturing in Jimusar shale

Minghui LiFujian ZhouZhonghua Sun

12页

查看更多>>摘要：Temporary plugging and diverting fracturing (TPDF) is one promising technology to form complex fracture networks in unconventional oil and gas resources, such as Jimusar shale in China. The key to the success of this technology depends on two processes: creating a tight plug within previously-created fractures using temporary plugging agents (TPA), and then forming diverted fractures after plugging. Many scholars have studied the plugging law of TPA under different channels aiming at the first process. However, the second process of fracture re-direct to form fracture networks after effective plugging has not been investigated clearly, especially in shale formations. Based on Jimusar shale, this paper investigated the plugging performance of fibers and particles and diverting fracturing behavior under three different TPDF application scenarios: near-wellbore in-plane TPDF, multistage TPDF in the horizontal wellbore. and far-field TPDF within fractures. A series of experiments were carried out under different stress difference conditions and TPA types using true tri-axial fracturing system. Experimental results show that: firstly, in near-wellbore TPDF experiments, the plugging pressure peaks would be increased with horizontal stress difference (HSD) while the deflection angle between the diverted fracture and the initial fracture would decrease with HSD. Once the HSD is over 7.5 MPa, the diverted fractures would be nearly parallel to the initial fractures. Secondly, in far-field TPDF within 2 mm propped fractures, 1 wt% pure fibers cannot form the effective plug in any fractures regardless of the HSD, while the combination of 1 wt% fibers and 1 wt% particles could effectively plug all fractures. The diverted fractures could be only created as branch fractures at the middle of the initial fractures, but the diverted fractures would be merged into the initial fractures when HSD is over 7.5 MPa. Thirdly, in multistage TPDF in the horizontal wellbore, the initial fracture almost initiates from only one slot and becomes one transverse fracture, but multiple parallel transverse fractures after plugging could happen but not always occur. The diverted fracture may also form a longitudinal fracture under low HSD because the slots have been plugged by TPAs. In addition, influenced by bedding and natural fractures, more bedding fractures are activated after plugging, which forms a more complex fracture network. Our experimental results could deepen the understanding of TPDF in Jimusar shale reservoir and also provide fundamental for field design in similar shale reservoirs.

原文链接:

NSTL

Review of the application of environmentally responsive gels in drilling and oil recovery engineering: Synthetic materials, mechanism, and application prospect

Jing-bin YangJin-sheng SunYing-rui Bai

19页

查看更多>>摘要：In recent years, environmentally responsive gel has gradually become the focus of attention in the oilfield, and it is also a new research direction in the field of lost circulation control and oil recovery in oilfields. It is favored because it is sensitive and responsive to the environment. At present, the research and application of environmentally responsive gels in China and abroad are mainly concentrated in the fields of agriculture, biomedical science, environmental engineering, tissue engineering and so on, but it is rarely used in the field of lost circulation control and enhanced oil recovery. Based on this, this paper summarizes the research status and application of environmentally responsive gel in the field of oil and gas drilling and production engineering, and mainly summarizes the latest research progress of temperature-sensitive gel, salt-sensitive gel and acid-base sensitive gel. In particular, its synthesis methods, performance characteristics and action mechanism are analyzed and summarized, and the application research progress of environmentally responsive gel in oil and gas drilling and production are introduced in detail. Meanwhile, combined with the synthesis method and action mechanism of environmentally responsive gel, this paper expounds the application prospect of environmentally responsive gel in the field of oil and gas drilling and production, and then puts forward the future development direction of environmentally responsive gel in the field of oil and gas drilling and production engineering. Therefore, the development of "hybrid" environmentally responsive gel with double (multiple) response function suitable for oil and gas drilling and production will become an important development direction in the field of oil and gas drilling and production with the deepening of the research on environmentally responsive gel materials.

原文链接:

NSTL