The Test of Amine Polymeric Alcohol Drilling Fluid System in Baka Block

2012 ◽  
Vol 268-270 ◽  
pp. 614-617
Author(s):  
Yu Xue Sun ◽  
Bo Xu ◽  
Yu Ning Xie
Keyword(s):  
Coal Seam ◽  
Shear Force ◽  
Drilling Fluid ◽  
Strong Inhibition ◽  
Fluid System ◽  
Thick Coal Seam ◽  
Recovery Test ◽  
Jurassic Coal ◽  
Tertiary Recovery ◽  
Reservoir Protection

2500 meters below Baka block appears extremely thick coal seam and distributed long, unconsolidated and mixed up with carbonaceous mudstone between beds. The relieved stress after a new borehole is drilled will lead to the wellbore caving and peeling and finally form an approximate elliptic borehole, causing vicious accidents such as bit bouncing, bit freezing while tripping and even borehole discarding. The anti-sloughing capability of Amine Polymeric Alcohol (AP-1) was evaluated by tertiary recovery test and core immersing test, the formula of Amine Polymeric Alcohol drilling fluid system was also optimized. Indoor research shows that the drilling fluid is of strong inhibition and pollution resistance. Its plastic viscosity is 24 mPa•s, shear force is 11 Pa and permeability recovery value reached（81.9-89.6）%. The successful test in Ke 21 Ping 1 well indicates that Amine Polymeric Alcohol drilling fluid system with powerful inhibition can effectively solve the collapse of Jurassic coal seam and carbonaceous mudstone, present high lubricity and can improve the drilling speed effectively, meanwhile, it performances well in gaining reservoir protection, controlling drilling fluid rheological properties, enhancing pollution resistance and reducing the occurrence of complex accidents downhole. Thus it can provide reference for future drilling operation in sloughing formations.

A Research and Application of Strong Inhibition Drilling Fluid

2014 ◽  
Vol 675-677 ◽  
pp. 1481-1484 ◽  
Author(s):  
Jun Kang Wu ◽  
Hou Ying Xu ◽  
Yu Ning Xie ◽  
Xiao Yu Zhou
Keyword(s):  
Drilling Fluid ◽  
Elliptical Hole ◽  
Immersion Test ◽  
Carbonaceous Shale ◽  
Strong Inhibition ◽  
Thick Coal Seam ◽  
Test Card ◽  
Well Abandonment ◽  
Reservoir Protection ◽  
Complicated Conditions

Thick coal seam BK block the distribution appears below 2500 meters long, loose and mixed carbonaceous mudstone. Release a new borehole pressure after the drill will cause collapse block falling, finally form an approximate elliptical hole, such as malignant accidents caused by its drill, bit freezing trip even well abandonment. Through three times of immersion test evaluation of the anti collapse ability of NH-1 core, NH-1 drilling fluid system has been optimized. Results show that, the drilling fluid has strong inhibition and anti pollution. The plastic viscosity is 24 mPa·s, the shear stress of 11Pa and the permeability recovery value reached (81.9-89.6)%. The success of the test card 21 Ping 1 well shows that the system of NH-1 drilling fluid has strong inhibition can effectively solve the Jurassic coal and carbonaceous shale collapse, the current high lubricating performance, can effectively improve the drilling speed, at the same time, its performance for reservoir protection, control the rheological properties of drilling fluid, improve the anti pollution and reduce the occurrence of downhole complicated conditions. Therefore, it can be in the sloughing formation for drilling operation reference for future.

Performance Evaluation and Application of the Non-Clay Weak Gel Drilling Fluid for Daniudi Gas Field

2013 ◽  
Vol 781-784 ◽  
pp. 2861-2864
Author(s):  
Wan Long Huang ◽  
Yi Shan Lou ◽  
Xiao Yong Ma ◽  
Hai Min Xu ◽  
Qiang Wang
Keyword(s):  
Rheological Property ◽  
Solid Phase ◽  
Drilling Fluid ◽  
Drilling Process ◽  
Fluid System ◽  
Gas Field ◽  
Horizontal Section ◽  
Good Ability ◽  
Weak Gel ◽  
Reservoir Protection

Daniudi Gas Field reservoir has low degree of porosity and permeability, thus it is highly susceptible to the invasion of the solid phase of clay particles in the drilling fluid during the drilling process, in view of these problems, we introduce the non-clay weak gel drilling fluid system. Experiments of the drilling fluid system for rheological property, salt-resisting pollution, hot rolling rate of recovery, reservoir damage evaluation and drilling fluid treating chemical opimization have been taken. The experimental results show that the drilling fluid system has excellent temperature-resisting and salt-resisting character, good ability of suspending debris and strong inhibitory action, its rheological property can meet the needs of the long horizontal section of drilling engineering and the reservoir protection effect is excellent. In DP21 well horizontal section construction, each performance indicator of the drilling fluid can be controlled well and effectively solve the problems of cuttings carrying, borehole wall stability and reservoir protection, successfully completed the DP21 well drilling construction task.

Micro Foam Drilling Fluid System Performance Research and Application

2013 ◽  
Vol 868 ◽  
pp. 601-605 ◽  
Author(s):  
Nan Nan Wang ◽  
Yong Ping Wang ◽  
Dong Zhang ◽  
Hui Min Tang
Keyword(s):  
Oil And Gas ◽  
Drilling Fluid ◽  
Field Application ◽  
Fluid System ◽  
Foaming Agent ◽  
Fluid Properties ◽  
Single Well ◽  
Set Up ◽  
Reservoir Protection ◽  
Foam Drilling

Micro foam drilling fluid has irreplaceable advantages in reservoir protection, drilling speed, improve the cementing quality and leak plugging, especially suitable for the "three low" Daqing peripheral oilfield Haita area. Indoor the foaming agent, foam stabilizing agent were screened, Preferably choose the efficient composite foaming agent, stabilizer and thickener, the drilling fluid system is transformed into micro foam drilling fluid system. And evaluate the inhibition, anti temperature, anti pollution (anti clay, calcium, anti kerosene) reservoir protection capability, The micro foam drilling fluid leakage, oil reservoir protection, speed up mechanism and micro foam drilling fluid rheological characteristics were studied, Set up a specific rheological model of Micro Foam Drilling fluid, According to the characteristics of Gulong oilfield,R&D the calculation software of Micro Foam drilling fluid density changes with the temperature, pressure and provide guidance for safe drilling. Field application shows that the system has the advantages of simple preparation,convenient maintenance, easy transformation, drilling fluid properties can meet the requirements of drilling technology, To ensure the safe, fast, and high quality drilling of oil and gas,reduce pollution,improve the productivity of a single well.

Drilling Fluid Technology for Extended-Reach Horizontal Wells in Cuba

2013 ◽  
Vol 765-767 ◽  
pp. 270-273
Author(s):  
Cheng Luo ◽  
Yi Qin ◽  
Xiao Chun Cao
Keyword(s):  
Maintenance Treatment ◽  
Drilling Fluid ◽  
Horizontal Wells ◽  
Strong Inhibition ◽  
Accident Rate ◽  
Fluid System ◽  
Treatment Measures ◽  
Drilling Cost

This Extended-reach horizontal wells lies in Guanabo block of Cuba, using the KCl polymer drilling fluid system which has strong inhibition. To strengthen the drilling fluid inhibition, it keeps the concentration of GW FA-367 at around 0.5% in the construction, KCl is 8%~10%, GW POLYCOL is 2% ~ 3%, it also takes the use of other assorted maintenance treatment measures at the same time. The results of application show that, compared with other wells of this region, this well greatly shortens the drilling cycle, reduces the accident rate and the drilling cost, the drilling fluid lubricity is good.

scholarly journals Polymer Drilling Fluid with Micron-Grade Cenosphere for Deep Coal Seam

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Peng Xu ◽  
Han-qiao Xiong ◽  
Xiao-lin Pu ◽  
Ju-quan Liu ◽  
Xing Liu
Keyword(s):  
Coal Seam ◽  
Bearing Capacity ◽  
Performance Test ◽  
Drilling Fluid ◽  
New Thought ◽  
Free System ◽  
Existing Problems ◽  
Filtration Loss ◽  
Shallow Coal Seam ◽  
Reservoir Protection

Traditional shallow coal seam uses clean water, solid-free system, and foam system as drilling fluid, while they are not suitable for deep coal seam drilling due to mismatching density, insufficient bearing capacity, and poor reservoir protection effect. According to the existing problems of drilling fluid, micron-grade cenosphere with high bearing capacity and ultralow true density is selected as density regulator; it, together with polymer “XC + CMC” and some other auxiliary agents, is jointly used to build micron-grade polymer drilling fluid with cenosphere which is suitable for deep coal seam. Basic performance test shows that the drilling fluid has good rheological property, low filtration loss, good density adjustability, shear thinning, and thixotropy; besides, drilling fluid flow is in line with the power law rheological model. Compared with traditional drilling fluid, dispersion stability basically does not change within 26 h; settlement stability evaluated with two methods only shows a small amount of change; permeability recovery rate evaluated with Qinshui Basin deep coal seam core exceeds 80%. Polymer drilling fluid with cenosphere provides a new thought to solve the problem of drilling fluid density and pressure for deep coal seam drilling and also effectively improves the performance of reservoir protection ability.

scholarly journals Cooperative Control Mechanism of Long Flexible Bolts and Blasting Pressure Relief in Hard Roof Roadways of Extra-Thick Coal Seams: A Case Study

2021 ◽  
Vol 11 (9) ◽  
pp. 4125
Author(s):  
Zhe Xiang ◽  
Nong Zhang ◽  
Zhengzheng Xie ◽  
Feng Guo ◽  
Chenghao Zhang
Keyword(s):  
Coal Seam ◽  
Cooperative Control ◽  
Field Tests ◽  
Surrounding Rock ◽  
Deep Hole ◽  
Coal Seams ◽  
Thick Coal Seam ◽  
Structure Damage ◽  
Hard Roof

The higher strength of a hard roof leads to higher coal pressure during coal mining, especially under extra-thick coal seam conditions. This study addresses the hard roof control problem for extra-thick coal seams using the air return roadway 4106 (AR 4106) of the Wenjiapo Coal Mine as a case study. A new surrounding rock control strategy is proposed, which mainly includes 44 m deep-hole pre-splitting blasting for stress releasing and flexible 4-m-long bolt for roof supporting. Based on the new support scheme, field tests were performed. The results show that roadway support failure in traditional scenarios is caused by insufficient bolt length and extensive rotary subsidence of the long cantilever beam of the hard roof. In the new proposed scheme, flexible 4-m-long bolts are shown to effectively restrain the initial expansion deformation of the top coal. The deflection of the rock beam anchored by the roof foundation are improved. Deep-hole pre-splitting blasting effectively reduces the cantilever distance of the “block B” of the voussoir beam structure. The stress environment of the roadway surrounding rock is optimized and anchorage structure damage is inhibited. The results provide insights regarding the safe control of roadway roofs under extra-thick coal seam conditions.

The Application of PEM Drilling Fluid System in Environmentally Sensitivity Area

2001 ◽  
Author(s):  
Xu Shaocheng ◽  
Xiaojian Jin ◽  
Li Zili ◽  
Xinjing Xiang
Keyword(s):  
Drilling Fluid ◽  
Fluid System

Application of Benzotriazole Corrosion Inhibitor in Synthetic-Based Drilling Fluid and its Overall Impact in Improving Drilling Fluid Functionality

2021 ◽  
Author(s):  
Zhao Xionghu ◽  
Saviour Bassey Egwu ◽  
Deng Jingen ◽  
Miao Liujie
Keyword(s):  
Corrosion Rate ◽  
Corrosion Inhibitor ◽  
Coefficient Of Friction ◽  
Hot Rolling ◽  
Drilling Fluid ◽  
Effect Of Temperature ◽  
Fluid Loss ◽  
Fluid Composition ◽  
Fluid System ◽  
Before And After

Abstract The effect of corrosion inhibitor Benzotriazole on synthetic-based mud system was studied. Rheological performance of the benzotriazole enhanced synthetic-based fluid system was studied and compared against the base mud. To study its effect on dynamic wellbore conditions, different drilling fluid compositions were placed in a hot rolling oven for 16 hours at temperatures 150 °C and 170°C and the effect of temperature on mud properties were studied. Tests carried out include rheological test (before and after hot rolling), filtrate pH, lubricity test, and fluid loss test. The corrosion penetration rate was studied using the weight loss method. Based on experiment results, the synthetic-based mud system which comprised of benzotriazole displayed a reduction in coefficient of friction up to 95.93%. At ambient condition, optimal ratio of mineral oil:benzotriazole (M:B) which gives best lubricity performance on synthetic-based mud system is 80:20. This leads to improved corrosion inhibition and lubricity of the synthetic-based fluid by reducing the coefficient of friction up to 90.13%. Increased temperature led to further decrease in coefficient of friction with a % torque reduction of 95.93 displayed by the 80:20 ratio M:B mud composition at 170 °C. Significant alterations of the mud composition rheological and fluid loss parameters before and after exposure to high temperature in hot rolling oven were not observed. pH values were maintained ≥7 at the dynamic conditions highlighting solubility of the formulated fluid composition and absence of contaminants which can pose significant threats to the rates of corrosion in drill pipes. Increasing the concentration of Benzotriazole led to a reduction in corrosion rate. However, as the temperature effect increased, the corrosion rate elevated. Based on results from this investigation, it was concluded that Benzotriazole can be applied as a corrosion inhibitor in a synthetic-based drilling fluid system as an alternative corrosion inhibitor without significant alteration of the base mud properties. Benefits of this will be the optimization of extended reach well drilling operations due to excellent lubricity performance, corrosion rate reduction, compatibility with HPHT wellbore condition and fluid loss control.

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