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Plugging performance and mechanism of an oil-absorbing gel for lost circulation control while drilling in fractured formations

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Petroleum Science 2022年第6期19卷 2941-2958页

作者： Ying-Rui Bai Li-Yao Dai Jin-Sheng Sun Guan-Cheng Jiang Kai-He Lv Rong-Chao Cheng Xiao-Sen Shang School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina CNPC Engineering Technology R&D Company Limited Beijing102206China College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China

lost circulation of drilling fluid is one of the most common engineering problems in the drilling process of fractured *** this study,an oil-absorbing polymer gel synthesized using compound monomers with rigid and flexible chains was applied to control the oil-based drilling fluid loss while *** microstructure,oil-absorbing performance,and plugging performance the gel was investigated.A large number of dense pores on the surface of the gel were observed,which allowed the oil molecules to enter the internal space of the *** initial oil absorption capacity of the gel was fast,and it increased with the increase in the temperature and decrease in the particle size,reaching 20.93 g/g at140℃.At a high temperature of 140℃,the bearing pressure capacity of the gel formula containing particles of different particle sizes reached 7.6 MPa for a fracture of a width of 3 mm,showing that the oil-absorbing gel have excellent plugging performance at high *** mechanism of the gel was investigated through visualized fracture plugging *** show that the dynamic migratio n,particle-swelling,particle-bridging,particle-aggregation,deformation-filling,and compaction-plugging contribute to the whole lost circulation control process,reflecting that the plugging performance can be effectively enhanced by improving the aggregation and filling degrees of the gel with different particle sizes.

关键词： lost circulation Oil-absorbing gel Oil absorption capacity Plugging mechanism Fractured formation

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Experimental investigation of the application of Eucalyptus bark to prevent lost circulation in pay zones with acid dissolution capability

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Petroleum 2021年第2期7卷 152-159页

作者： Mostafa Sedaghatzadeh Khalil Shahbazi Peyman Pourafshary Seyed Ali Razavi National Iranian Drilling Company Ahvaz90161635Iran Petroleum University of Technology Abadan***Iran School of Mining and Geoscience Nazarbayev UniversityNur-Sultan010000Kazakhstan

Loss of drilling fluid is a common problem during the drilling of wells and it restricts the appropriate functionality of *** fluid loss significantly increases drilling costs and non-productive time as well as the drilling operation *** investigations have been carried out in order to find appropriate mud additives that either block fractures and pores or reduce fluid loss by improving the fluid ***,environmentally friendly and effective additives are still required by the drilling ***,the application of available materials in each region,to produce appropriate additives,is a challenge for the oil *** this study,Eucalyptus Camaldulensis(EUC)bark powder has been chosen as a new,fibrous,cheap,environmentally friendly and available material to control fluid loss,particularly in southern *** characterization tests,such as acid dissolution and fluid loss control,were carried out to study the performance of the new proposed *** by hydrochloric acid and sulfuric acid were studied at various acid concentrations and *** fluid loss was also measured at different EUC *** study showed that EUC powder can reduce the final fluid loss by 88-97%,the initial fluid loss by 45-66%,and the total loss by 87e94%,which is a satisfactory level.

关键词： Eucalyptus bark lost circulation Acid solubility Drilling mud Fluid loss

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Application of adaptive neuro-fuzzy inference system and data mining approach to predict lost circulation using DOE technique (case study: Maroon oilfield)

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Petroleum 2020年第4期6卷 423-437页

作者： Farough Agin Rasool Khosravanian Mohsen Karimifard Amirhosein Jahanshahi Department of Petroleum Engineering Amirkabir University of Technology(Tehran Polytechnic)424 Hafez AvenueTehran15875-4413Iran Research Institute of Petroleum Industry(RIPI) West Blvd.Near Azadi Sports ComplexTehran14857-33111Iran Department of Petroleum Engineering Petroleum University of TechnologyAhwazIran School of Mining Engineering College of EngineeringUniversity of Tehran14174-66191TehranIran

lost circulation is the most common problem encountered while drilling oil *** of such a problem can cause a lot of time and cost *** order to drill oil wells,a fast and profitable way is necessary to predict and solve lost circulation *** system is a method used lately for problems that deal with *** this paper,three approaches are carried out for prediction of lost circulation *** approaches include design of experiments(DOE),data mining,and adaptive neuro-fuzzy inference system(ANFIS).Data of 61 wells of Maroon oilfield are selected and sorted as the feed of the *** variables are used as inputs of the approaches and one variable is used as the ***,DOE is conducted to observe the effects of ***-Burman method is used to determine the effects of variables on lost *** that,data mining is conducted to predict the amount of lost *** class of regression is used to determine a function to model the data and the error of the ***,ANFIS is applied to predict the amount of lost *** chosen data are used in order to train,test,and control the ***,subtractive clustering is used to train the fuzzy inference system(FIS)of the *** performance of the ANFIS model is assessed through the root mean squared error(RMSE).The results suggest that ANFIS method can be successfully applied to establish lost circulation prediction *** addition,results of ANFIS and data mining are investigated through their prediction *** comparison of both methods reveals that ANFIS error is much lower than data mining.

关键词： lost circulation Maroon oilfield ANFIS RMSE Expert system

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A comprehensive investigation on the performance of durian rind as a lost circulation material in water based drilling mud

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Petroleum 2019年第3期5卷 285-294页

作者： Nor Fatin Fatihah Majid Allan Katende Issham Ismail Farad Sagala Norshila Md Sharif Mohd Azizi Che Yunuse Department of Petroleum Engineering Faculty of Chemical and Energy EngineeringUniversiti Teknologi Malaysia(UTM)Malaysia Department of Energy Minerals and Petroleum EngineeringFaculty of Applied Sciences and TechnologyMbarara University of Science and Technology(MUST)Kihumuro CampusUganda Department of Geoscience and Petroleum Norwegian University of Science and Technology(NTNU)Norway Department of Chemical and Petroleum Engineering University of Calgary(UC)2500 University Dr.NW CalgaryCanada Department of Chemical Engineering Faculty of Chemical and Energy EngineeringUniversiti Teknologi Malaysia(UTM)Malaysia

Oil and gas operators worldwide are expecting service companies to deliver integrated techniques to minimize,if not prevent,drilling *** fluids perform vital functions to ensure the success of drilling *** technical challenges often associated with water-based drilling fluids are loss of critical properties,such as fluid loss control and rheology,under demanding conditions,such as in drilling deeper,high-temperature and high-pressure *** loss during drilling operations has a very significant effect in both reservoir formation damage and monetary *** use of durian rind(DR)as a new additive in controlling lost circulation would provide another opportunity to reduce waste and avoid ***,DR was used to improve the rheological properties of water-based mud,and it was prepared for use as a fluid loss *** a better understanding of the influence of pectin on drilling mud properties,the rheological evaluation of untreated DR was compared to that of mud samples containing treated *** pectin in DR was extracted using four different solvents,namely,ethanol,methanol,sodium hydroxide and hydrogen peroxide,and the most effective solvent to remove the pectin was then *** Fourier transform infrared spectroscopy(FTIR)results showed that NaOH was the best solvent for removing pectin from *** analysis(TGA)was used to determine the thermal stability of DR before and after *** TGA results demonstrated that the treated DR had improved thermal stability compared to untreated *** sizes of DR used were coarse,medium,and *** untreated DR presented better rheological properties than the treated *** experimental investigation showed that a concentration of 20 lb/bbl of intermediate-sized DR was the best concentration among the tested samples.

关键词： lost circulation Formation damage Durian rind Pectin Water-based mud Rheological properties

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Data–driven decision–making for lost circulation treatments: A machine learning approach

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Energy and AI 2020年第2期2卷 125-135页

作者： Husam H.Alkinani Abo Taleb T.Al-Hameedi Shari Dunn-Norman Missouri University of Science and Technology 1201 N State StRollaMO 65409USA

lost circulation is an expensive and critical problem in the drilling *** of dollars are spent every year to mitigate or stop this *** this work,data from over 3000 wells were collected from multiple *** data went through a processing step where all outliers were removed and decision rules were set *** machine learning methods(support vector machine,decision trees,logistic regression,artificial neural networks,and ensemble trees)were used to create a model that can predict the best lost circulation treatment based on the type of loss and the reason of loss.5-fold cross-validation was conducted to ensure no overfitting in the created *** using all the aforementioned machine learning methods to train models to choose the best lost circulation treatment,overall,the results showed that support vector machine had the highest accuracy among the other ***,it was selected to train the *** created model went through quality control/quality assurance(QC/QA)to limit the results of incorrect *** treatments were suggested to treat partial loss,four to treat severe loss,and seven for complete loss,based on the reason of *** addition,a formalized methodology to respond to lost circulation was provided to help the drilling personnel handling lost circulation in the field.

关键词： Machine learning lost circulation Data-driven Classification

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Research on conversion time between lost circulation and overflow for the fractured stratum

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Petroleum 2020年第1期6卷 98-105页

作者： Rongguo Nie Hongwei Xia Liangjie Mao Mingjie Cai School of Engineering Southwest Petroleum UniversityNanchong637000China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Engineering Technology Research Institute PetroChina Southwest Oil&Gas Field CompanyGuanghan618300China Chengdu Gaopu Petroleum Engineering Technology Co.Ltd Chengdu610000China

A new model was established based on the flow model of the drilling fluid in one-dimensional radial fracture to research the influencing factors on conversion time between lost circulation and overflow for multi-pressure system in fractured *** the equation of the conversion time between lost circulation and overflow is obtained by solving the mathematical *** model were validated by reproducing the field data from Sichuan oil field and the simulation results of *** influences of consistency index,liquidity index,dynamic shear force,drilling fluid density,drilling fluid intrusion depth,pressure of lost circulation layer,crack width,decreased height of annular liquid level,pressure of high-pressure layer were *** indicate that conversion time between lost circulation and overflow increases with the increasing consistency index,liquidity index,dynamic shear force,drilling fluid density,drilling fluid intrusion depth,pressure of lost circulation *** time between lost circulation and overflow decreases with the increasing crack width,decreased height of annular liquid level,pressure of high-pressure *** time interval of“Hang's Muddingoff”operating should be appropriately less than the conversion time between lost circulation and *** the premise of ensuring wellbore safety,appropriately increasing the consistency index,liquidity index and dynamic shear force of the drilling fluid can effectively increase the conversion time between lost circulation and overflow in large fractured stratum.

关键词： Fractured stratum Conversion time lost circulation Overflow

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Analysis of the lost circulation Problem

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1721-1733页

作者： Xingquan Zhang Renjun Xie Kuan Liu Yating Li Yuqiang Xu CNOOC Research Institute Beijing100101China College of Petroleum Engineering China University of PetroleumQingdao266580China

The well-known“lost circulation”problem refers to the uncontrolled flow of whole mud into a *** order to address the problem related to the paucity of available data,in the present study,a model is introduced for the lost-circulation risk sample profile of a drilled *** model is built taking into account effective data(the Block L).Then,using a three-dimensional geological modeling software,relying on the variation function and sequential Gaussian simulation method,a three-dimensional block lost-circulation risk model is introduced able to provide relevant information for regional analyses.

关键词： Geostatistics risk assessment variation function sequential gaussian simulation drilling risk lost circulation evaluation method

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Structural failure mechanism and strengthening method of fracture plugging zone for lost circulation control in deep naturally fractured reservoirs

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Petroleum Exploration and Development 2020年第2期47卷 430-440页

作者： XU Chengyuan YAN Xiaopeng KANG Yili YOU Lijun ZHANG Jingyi State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China

Focused on the lost circulation control in deep naturally fractured reservoirs, the multiscale structure of fracture plugging zone is proposed based on the theory of granular matter mechanics, and the structural failure pattern of plugging zone is developed to reveal the plugging zone failure mechanisms in deep, high temperature, high pressure, and high in-situ stress environment. Based on the fracture plugging zone strength model, key performance parameters are determined for the optimal selection of loss control material(LCM). Laboratory fracture plugging experiments with new LCM are carried out to evaluate the effect of the key performance parameters of LCM on fracture plugging quality. LCM selection strategy for fractured reservoirs is developed. The results show that the force chain formed by LCMs determines the pressure stabilization of macro-scale fracture plugging zone. Friction failure and shear failure are the two major failure patterns of fracture plugging zone. The strength of force chain depends on the performance of micro-scale LCM, and the LCM key performance parameters include particle size distribution, fiber aspect ratio, friction coefficient, compressive strength, soluble ability and high temperature resistance. Results of lab experiments and field test show that lost circulation control quality can be effectively improved with the optimal material selection based on the extracted key performance parameters of LCMs.

关键词： deep layer fractured reservoir lost circulation fracture plugging zone multi-scale structure strength and stability loss control material

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Development Status and Prospect of the Technology for preventing and Curing lost circulation during Coalbed Methane Drilling

Development Status and Prospect of the Technology for preven...

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作者： Jing ZHANG China Coal Research Institute Xi’an Research Institute of China Coal Technology ＆ Engineering Group Corp.

According to the exploration and development status the tendency of coalbed methane in China,based on the experience of curing the losses during CBM drilling and the investigation on the exploration and development projects of CBM,the status of preventing and curing the losses technology during CBM drilling was *** analysis indicated that lost circulation occurred frequently in loose covering,pore formation,karst fissure formation and gobs area during CBM *** analysis also indicated that the preventing and curing the losses technology had been formed,including preventing technology centered upon air drilling,underbalanced drilling and temporary plugging technology,curing losses technology centered casing,bridging,cementing and the composite sealing *** major development prospect of preventing and sealing technology of the leakage during CBM drilling has been stated in this *** research on air drilling motor,as well as the application of temporary plugging technology,mud to cement technology and the composite bridging plugging technology with high concentration of lost circulation materials,should be continuously deepening in order to reduce the composite cost of the treatment for lost circulation during the development of CBM.

关键词： Coalbed methane lost circulation Preventing lost circulation Curing lost circulation Development prospect

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Machine learning for carbonate formation drilling: Mud loss prediction using seismic attributes and mud loss records

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Petroleum Science 2024年第2期21卷 1241-1256页

作者： Hui-Wen Pang Han-Qing Wang Yi-Tian Xiao Yan Jin Yun-Hu Lu Yong-Dong Fan Zhen Nie National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China College of Science China University of Petroleum-BeijingBeijing102249China Petroleum Exploration and Production Research Institute SINOPECBeijing102206China College of Petroleum Engineering China University of Petroleum-BeijingBeijing102249China Research Institute of Petroleum Exploration and Development CNPCBeijing100083China

Due to the complexity and variability of carbonate formation leakage zones, lost circulation prediction and control is one of the major challenges of carbonate drilling. It raises well-control risks and production expenses. This research utilizes the H oilfield as an example, employs seismic features to analyze mud loss prediction, and produces a complete set of pre-drilling mud loss prediction solutions. Firstly, 16seismic attributes are calculated based on the post-stack seismic data, and the mud loss rate per unit footage is specified. The sample set is constructed by extracting each attribute from the seismic trace surrounding 15 typical wells, with a ratio of 8:2 between the training set and the test set. With the calibration results for mud loss rate per unit footage, the nonlinear mapping relationship between seismic attributes and mud loss rate per unit size is established using the mixed density network ***, the influence of the number of sub-Gausses and the uncertainty coefficient on the model's prediction is evaluated. Finally, the model is used in conjunction with downhole drilling conditions to assess the risk of mud loss in various layers and along the wellbore trajectory. The study demonstrates that the mean relative errors of the model for training data and test data are 6.9% and 7.5%, respectively, and that R2is 90% and 88%, respectively, for training data and test data. The accuracy and efficacy of mud loss prediction may be greatly enhanced by combining 16 seismic attributes with the mud loss rate per unit footage and applying machine learning methods. The mud loss prediction model based on the MDN model can not only predict the mud loss rate but also objectively evaluate the prediction based on the quality of the data and the model.

关键词： lost circulation Risk prediction Machine learning Seismic attributes Mud loss records

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