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A novel polymer gel with high-temperature and high-salinity resistance for conformance control in carbonate reservoirs

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Petroleum Science 2022年第6期19卷 3159-3170页

作者： Wei-Peng Wu Ji-Rui Hou Ming Qu Yu-Long Yang Wei Zhang Wen-Ming Wu Yu-Chen Wen Tuo Liang Li-Xiao Xiao Unconventional Petroleum Research Institute China University of PetroleumBeijing102249China sinopec northwest oilfield Company UrumqiXinjiang830000China

Plugging agents have been widely used to enhance oil recovery in fractured-vuggy carbonate ***,the harsh conditions of fractured-vuggy carbonate reservoirs yield a significant challenge in maintaining a long-term stabilization of plugging *** this work,we developed an anti-hightemperature and high-salinity polymer gel(APG)with excellent resistance to high temperature(140℃)and ultra-high salinity(240000 mg/L).The rheology and microstructure of APG were characterized before and after *** plugging tests on fractured cubic cores were conducted to quantify the plugging performance of the gel *** results showed that the Sclerglucan and Cobalt(Ⅱ)Chloride Hexahydrate filled the three-dimensional(3-D)network with various morphologies,providing extra protection to the cross-linking points of the 3D network structure of APG and thus,leading to a prolongation of the dehydration *** dehydration rate of APG was only 5%within 30days,and the strength of APG could be maintained at a rigid or near-rigid level over 150 ***,APG exhibited satisfactory shear and scour *** plugging tests showed that APG could achieve a plugging rate of 90%and demonstrate ignorable minor damage to the *** results indicate that APG can serve as a great candidate in channel plugging in fractured-vuggy carbonate reservoirs where fractures are fully developed.

关键词： Conformance control Fractured-vuggy reservoir High temperature High salinity Thermal stability

Estimation of the amount of erosion at unconformities in the last stage of the Eocene Sanduo period in the Subei Basin,China

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Petroleum Science 2009年第4期6卷 383-388页

作者： Chen Liqiong Jiangsu oilfield Company,sinopec,Jiangsu 225009,China Jiangsu oilfield Company SINOPEC Jiangsu China

Strata erosion is a widespread phenomenon in sedimentary basins. The generation, migration, and accumulation of hydrocarbon is influenced by the scale of erosion, so estimating the amount of erosion is essential in the analysis of oil and gas bearing basins. According to the geological features in the Subei Basin and the actual data, using the integrated method, we estimated the level of erosion at the unconformities caused by the Sanduo event. By using the mudstone interval transit time method and the vitrinite reflectance method on data from typical wells, it can be concluded that the Gaoyou, Jinhu, and Hongze depressions suffered strong strata erosion from the late Eocene to Oligocene, and the total strata erosion thickness was 300–1,100 m. Different tectonic units in the same depression have extremely uneven erosion intensity: the low convex regions have the maximum erosion thickness, amounting to 800–1,100 m; the slope regions have an erosion thickness of generally 600–800 m; the erosion thickness of the slope-hollow transition zone is 300–500 m. For the whole basin, we used the strata thickness trend analysis method combined with the interval transit time and vitrinite reflectance methods to estimate the erosion thickness in the Sanduo period. The results show that the most severe erosion of the Sanduo event in the Subei Basin is between 1,000 m to 1,200 m, mainly located in depressions around the Jianhu Uplift; the deep hollow area has the least erosion, generally about 300–600 m, and the erosion in the slope area is about 600–900 m. Compared with the northern part, the southern part has relatively little erosion. It is also proved that the Sanduo movement has heterogeneous intensity, and the western region has greater intensity than the eastern region.

关键词： Unconformity estimation of erosion mudstone interval transit time method vitrinite reflectance method Subei Basin

Study of asphaltene deposition from Tahe crude oil

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Petroleum Science 2013年第1期10卷 134-138页

作者： CHEN Chaogang GUO Jixiang AN Na REN Bo LI Yaguang JIANG Qingzhe China University of Petroleum Key Laboratory of Shale Gas Exploration Ministry of Land and ResourcesChongqing Institute of Geology and Mineral Resources northwest oilfield branch Engineering and Technology Institute of sinopec

Borehole blockage caused by asphaltene deposition is a problem in crude oil production in the Tahe oilfield, Xinjiang, China. This study has investigated the influences of crude oil compositions, temperature and pressure on asphaltene deposition. The asphaltene deposition trend of crude oil was studied by saturates, aromatics, resins and asphaltenes （SARA） method, and the turbidity method was applied for the first time to determine the onset of asphaltene flocculation. The results showed that the asphaltene deposition trend of crude oil by the turbidity method was in accordance with that by the SARA method. The asphaltene solubility in crude oil decreased with decreasing temperature and the amount of asphaltene deposits of T739 crude oil （from well T739, Tahe oilfield） had a maximum value at 60℃. From the PVT results, the bubble point pressure of TH 10403CX crude oil （from well TH10403CX, Tahe oilfield） at different temperatures can be obtained and the depth at which the maximum asphaltene flocculation would occur in boreholes can be calculated. The crude oil PVT results showed that at 50,90 and 130 ℃, the bubble point pressure of TH 10403CX crude oil was 25.2, 26,4 and 27.0 MPa, respectively. The depth of injecting asphaltene deposition inhibitors for TH10403CX was determined to be 2,700 m.

关键词： Onset of asphaltene flocculation turbidity method crude oil composition temperature,bubble point pressure borehole

Sedimentary hydrodynamic study of sand bodies in the upper subsection of the 4th Member of the Paleogene Shahejie Formation in the eastern Dongying Depression, China

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Petroleum Science 2014年第2期11卷 189-199页

作者： Jiang Zaixing Liang Shuyi Zhang Yuanfu Zhang Shanwen Qin Lanzhi Wei Xiaojie School of Energy Resources China University of Geosciences Shengli oilfield branch Corporation SINOPEC CNOOC China Limited–Shanghai

Petroleum is produced from a beach-bar sand reservoir in the upper subsection of the 4th member of the Paleogene Shahejie Formation （Es4s） in the eastern Dongying Depression,penetrated by many wells in the Guangli-Qingnan area and this subsection still has further exploration *** drilling and logging data,we analyzed the sand body types,emphasizing the sedimentary characteristics of the beach-bar sand *** these data with the concepts of lacustrine and oceanic hydrodynamics,we explain the formation and distribution of the beach-bar sands in the eastern Dongying *** connectivity between beach-bar sand bodies within each individual hydrodynamic zone is better than that between sand bodies in any two adjacent *** tempestite sand bodies developed in this area are characterized by typical storm deposits and are located at the bottoms of the beachbar sand *** grade upward to normal shore and shallow-lacustrine beaches and *** also propose a new simple method to estimate the paleo-water depth using the thicknesses of the bar sand bodies in parasequences combined with the principle of hydrodynamic *** on the distribution of the beach-bar sands in parasequence set 3,we infer that the paleo-wind direction was from the north with an average paleo-wind force of 6 when the major beach-bar sand bodies formed.

关键词： Beach-bar sedimentary hydrodynamic zone paleo-water depth paleo-wind force

Exploration progress of the Paleogene in Jiyang Depression,Bohai Bay Basin

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Energy Geoscience 2023年第1期4卷 42-50页

作者： Lichi Ma Mingshui Song Yongshi Wang Yanguang Wang Huimin Liu sinopec Shengli oilfield branch Company DongyingShandong257015China Petroleum Exploration and Production Research Institute SINOPECBeijing102206China

With increased exploration in the faulted basins of eastern China,petroleum exploration in this region has been challenged by unclear remaining petroleum resources distribution,complex reservoir and hydrocarbon enrichment patterns,and lacking of suitable exploration *** at resolving these problems,studies on source rocks,reservoirs,hydrocarbon accumulation and geophysical prospection were carried out by laboratory analysis,reservoir anatomy,and seismic analysis.A highlyefficient hydrocarbon generation/expulsion model of source rocks in saline environment was established,which aided in the discovery of a new set of source rocks in the Jiyang *** study also reveals the formation process of high-quality reservoir by alternating acid and alkaline fluids during deposition and diagenesis,and pattern of secondary pores development in deep clastic *** the fine anatomy of the oil reservoirs,an orderly distribution pattern of the oil reservoirs is established,and the potential exploration targets in the undrilled area are *** addition,single-point highdensity seismic acquisition and high-resolution imaging technologies are developed,enabling fine and efficient exploration in areas with high exploration *** research result plays a leading and demonstrative role in the fine and efficient exploration of faulted basins in eastern China.

关键词： Hydrocarbon generation/expulsion model Saline environment Acid and alkaline fluids Hydrocarbon accumulation model Faulted basin

A Novel Fracturing Fluid with High-Temperature Resistance for Ultra-Deep Reservoirs

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Fluid Dynamics & Materials Processing 2024年第5期20卷 975-987页

作者： Lian Liu Liang Li Kebo Jiao Junwei Fang Yun Luo northwest oilfield branch China Petroleum&Chemical CorporationUrumqi830011China sinopec Key Laboratory for Enhanced Recovery in Fractured and Cavernous Reservoir Urumqi830011China

Ultra-deep reservoirs play an important role at present in fossil energy *** to the related high temperature,high pressure,and high formation fracture pressure,however,methods for oil well stimulation do not produce satisfactory results when conventional fracturing fluids with a low pumping rate are *** response to the above problem,a fracturing fluid with a density of 1.2~1.4 g/cm^(3)was developed by using Potassium formatted,hydroxypropyl guanidine gum and zirconium crosslinking *** fracturing fluid was tested and its ability to maintain a viscosity of 100 mPa.s over more than 60 min was verified under a shear rate of 1701/s and at a temperature of 175℃.This fluid has good sand-carrying performances,a low viscosity after breaking the rubber,and the residue content is less than 200 mg/*** with ordinary reconstruction fluid,it can increase the density by 30%~40%and reduce the wellhead pressure of 8000 m level reconstruction ***,the new fracturing fluid can significantly mitigate safety risks.

关键词： Ultra-deep reservoir high-temperature resistance weighted fracturing fluid guanidine gum potassium formatted

A Quantitative Study of Fault Zone Sealing

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Acta Geologica Sinica(English Edition) 2010年第1期84卷 185-193页

作者： LI Yang ZHAO Mifu Department of Exploration and Development SINOPEC Beijing 100029 China Dongxin Production Factory Shengli Oilfield Branch Company SINOPEC Dongying 207068 China

A fault is not simply a plane, but a zone consisting of a series of broken planes or lower faults. The greater the scale of faults, the wider and more complex the fault zone is. Fault-sealing properties are influenced by the fault zone itself, whose fault displacement, depth, net-to-gross-ratio of mudstone, fault plane angle, and fault mechanical properties play important controlling roles. The sealing of hydrocarbon by the fault zone depends on whether the fault zone can form a continuous sealing zone and if the pore throats connecting those fault zones are small enough. The concept of fault zone-sealing potential is proposed here, and a quantitative formula is established by using a great amount of practical statistical data as well as the fuzzy comprehensive evaluation method, which is a comprehensive characterization parameter to judge whether or not fault zones could seal oil hydrocarbon. The greater the value of the fault zone-sealing potential, the better sealed the fault is. For example, with increasing depth, the sealing degree of the Xin 68 Fault in the Dongxin 1 oilfield changes greatly, reflecting the complexity of fault-sealing properties.

关键词： fault fault-sealing properties fault zone-sealing potential Xin 68 Fault

A geometric model of faulted detachment folding with pure shear and its application in the Tarim Basin, NW China

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Frontiers of Earth Science 2017年第2期11卷 416-426页

作者： Zewei YAO Guangyu HE Xiaoli ZHENG Chuanwan DONG Zicheng CAO Suju YANG Yi GU School of Earth Sciences Zhejiang University Hangzhou 310027 China sinopec northwest oilfield Company Urumqi 830011 China Wuxi Research Institute of Petroleum Geology SINOPEC Wuxi 214126 China

We present an improved geometric model of faulted detachment folding with pure shear that is characterized by core thickening and a ramp-discordant backlimb. The model includes a two-stage evolution： 1） detachment folding involving pure shear with fixed hinges, and 2） faulted detachment folding, in which the core of anticline thrusts above a break-through fault in forelimb by limb rotation. The growth strata patterns of the model are also discussed with respect to factors such as limb rotation, tectonic uplift rate, and sedimentation rate. A thrust-related fold, called a TBE thrust fold, in the Tarim Basin in NW China, is analyzed as an example of the theoretical model. The result indicates that the TBE thrust fold has undergone a two-stage evolution with shortening of a few hundred meters. Both the theoretical model and the actual example indicate that the shortening in the detachment folding stage takes up a large proportion of the total shortening. The structural restoration of the TBE thrust fold also provides new evidence that the formation of a series of thin-skinned structures in the SE Tarim Basin initiated in the Late Ordovician. The model may be applicable to low-amplitude faulted detachment folds.

关键词： faulted detachment folding geometric model pure shear growth strata Tarim Basin shortening

Mechanism of diagenetic trap formation in nearshore subaqueous fans on steep rift lacustrine basin slopes—A case study from the Shahejie Formation on the north slope of the Minfeng Subsag, Bohai Basin, China

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Petroleum Science 2014年第4期11卷 481-494页

作者： Wang Yanzhong Cao Yingchang Ma Benben Liu Huimin Gao Yongjin Chen Lin School of Geosciences China University of Petroleum Geological Science Research Institute of Shengli oilfield SINOPEC Western New Prospect Research Center of Shengli oilfield SINOPEC

Diagenetic traps in conglomerate in nearshore subaqueous fans in the steep slope zones of rift basins have been important exploration targets for subtle reservoirs in eastern China. However, the mechanism of how those traps were formed is not clear, which inhibits further exploration for this type of reservoir. In order to solve the problem, we take as an example nearshore subaqueous fans in the upper part of the fourth member of the Shahejie Formation （Es4s） on the north slope of the Minfeng Subsag in the Dongying Sag. Combining different research methods, such as core observation, thin section examination, scanning electron microscope （SEM） observation, fluid-inclusion analysis, carbon and oxygen isotope analysis of carbonate cements, and analysis of core properties, we studied the genetic mechanisms of diagenetic traps on the basis of diagenetic environment evolution and diagenetic evolution sequence in different sub/micro-facies. Conglomerate in Es4s in the north Minfeng Subsag experienced several periods of transition between alkaline and acidic environments as ＂alkaline-acidic-alkaline-acidic-weak alkaline＂. As a result, dissolution and cementation are also very complex, and the sequence is ＂early pyrite cementation / siderite cementation / gypsum cementation / calcite and dolomite cementation- feldspar dissolution / quartz overgrowth quartz dissolution / ferroan calcite cementation / ankerite cementation / lime-mud matrix recrystallization / feldspar overgrowth carbonate dissolution / feldspar dissolution / quartz overgrowth / pyrite cementation＂. The difference in sedimentary characteristics between different sub/micro-facies of nearshore subaqueous fans controls diagenetic characteristics. Inner fan conglomerates mainly experienced compaction and lime-mud matrix recrystallization, with weak dissolution, which led to a reduction in the porosity and permeability crucial to reservoir formation. Lime-mud matrix recrystallization results in a rapid decrease in p

关键词： Nearshore subaqueous fan diagenetic trap genetic mechanism Dongying Sag rift basin,lacustrine basin