A New Drilling Fluid for Formation Damage Control Used in Underbalanced Drilling

2000 ◽  
Author(s):  
Shiying Luo ◽  
Yun Li ◽  
Yingfeng Meng ◽  
Liehui Zhang
Keyword(s):  
Drilling Fluid ◽  
Damage Control ◽  
Formation Damage ◽  
Underbalanced Drilling ◽  
Formation Damage Control

The "U-Type" Wells History of Fuzzy Ball Drilling Fluids for CBM Drilling in China

2013 ◽  
Vol 748 ◽  
pp. 1273-1276 ◽  
Author(s):  
Ben Guang Guo ◽  
Li Hui Zheng ◽  
Shang Zhi Meng ◽  
Zhi Heng Zhang
Keyword(s):  
Drilling Fluid ◽  
Damage Control ◽  
Ordos Basin ◽  
Coal Bed ◽  
Formation Damage ◽  
Drilling Fluids ◽  
Horizontal Section ◽  
Lost Circulation ◽  
Well Bore Stability ◽  
Formation Damage Control

The fuzzy ball drilling fluids have been developed on the basis of the circulation foam and Aphron to control lost circulation effectively. There are some difficulties in drilling U-type well, such as well-bore stability, cutting carrying problem, large torque and friction at the horizontal section, and formation damage to coal-bed. The objective of this paper was to show some applications of fuzzy ball drilling fluids on U-type wells of the Ordos Basin and prove the superiority of fuzzy ball drilling fluid in CBM drilling. To the three mentioned cases, the density of fuzzy ball drilling fluid was 0.90~1.18g/cm3, the funnel viscosity was 45~72s, the dynamic shear force was 12~19 Pa, the PV was 13~19mPa·s and the pH was ranged from 7 to 9. To use the fuzzy ball drilling fluids, the average ROP increased above 10% with no borehole complexity, such as stuck pipe, hole enlargement causing poor cleaning and etc. These cases reflected excellent properties of the fuzzy ball drilling fluids including effectively sealing, good carrying and suspension ability, formation damage control and compatible weighted by inert materials. Furthermore, the fuzzy ball drilling fluids will not affect BHA tools like motors and MWD in CBM drilling.

A Novel Multifunctional Bionic Fuzzy-Ball Drilling Fluid

2011 ◽  
Vol 236-238 ◽  
pp. 608-615 ◽  
Author(s):  
Li Hui Zheng ◽  
Xiang Hui Wan ◽  
Hong Jie Zhang ◽  
Li Jun Chi ◽  
Ke Wen Peng
Keyword(s):  
Drilling Fluid ◽  
Damage Control ◽  
Low Pressure ◽  
Well Completion ◽  
Underbalanced Drilling ◽  
Yield Value ◽  
Open Hole ◽  
Air Drilling ◽  
Formation Damage Control ◽  
Conventional Drilling

The difficulties during the exploration and development of the reservoirs which are low pressure-permeability, low pressure fractured hydrocarbon or energy depleted put multi-requirements on drilling fluid, which include the capacity of inhibiting and sealing to avoid down hole losses and formation caving in the situation where different pressure coefficients exist in the same open hole, good compatibility with underbalanced drilling fluid such as air, mist, foam etc, good solids-carrying capacity and formation damage control according to varies kinds of well completion in different types of well like vertical, horizontal or multilateral well. Thus a novel multifunctional bionic fuzzy-ball drilling fluid was invented under the auspice of National Key Project. The density of the fluid which is solid free can reach to 0.8~1.0 g/cm3 with conventional drilling equipments. Also, its density can be above 1.0 g/cm3 by adding inert weighting additives to adapt to near-balanced or under-balanced drilling. Good sealing ability can avoid down hole losses, formation caving in opening and low-pressure layers above 1000m. The ratio of yield value and plastic viscosity can be above 1.0 Pa/mPa·s, which makes good performance in hole cleaning under low pump delivery with conventional drilling equipments. Being compatible with air, it can be used in water producing, sloughing formation and completions without converting to other types of drilling fluid system. Bionic fuzzy-ball drilling fluid has been used in more than 10 wells, which have the problems such as water production, formation caving and severe losses, and applied to air drilling. The field applications of bionic fuzzy-ball drilling fluid can be demonstrated by introducing the “U” shape horizontal well DFS-02-H2, multilateral well FL-H2-L, artesian flowing and formation caving well J35, air drilled well CLY22 and low pressure gas well Mo 80-C1.

scholarly journals Damage Mechanism of Oil-Based Drilling Fluid Flow in Seepage Channels for Fractured Tight Sandstone Gas Reservoirs

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Peng Xu ◽  
Mingbiao Xu
Keyword(s):  
Drilling Fluid ◽  
Damage Control ◽  
Damage Mechanism ◽  
Formation Damage ◽  
Drilling Fluids ◽  
Gas Reservoirs ◽  
Tight Sandstone ◽  
Stabilization Effect ◽  
Potential Damage ◽  
Physical And Chemical

Oil-based drilling fluids (OBDFs) have a strong wellbore stabilization effect, but little attention has been paid to the formation damage caused by oil-based drilling fluids based on traditional knowledge, which is a problem that must be solved prior to the application of oil-based drilling fluid. For ultradeep fractured tight sandstone gas reservoirs, the reservoir damage caused by oil-based drilling fluids is worthy of additional research. In this paper, the potential damage factors of oil-based drilling fluids and fractured tight sandstone formations are analyzed theoretically and experimentally. The damage mechanism of oil-based drilling fluids for fractured tight sandstone gas reservoirs is analyzed based on the characteristics of multiphase fluids in seepage channels, the physical and chemical changes of rocks, and the rheological stability of oil-based drilling fluids. Based on the damage mechanism of oil-based drilling fluids, the key problems that must be solved during the damage control of oil-based drilling fluids are analyzed, a detailed description of formation damage characteristics is made, and how to accurately and rapidly form plugging zones is addressed. This research on damage control can provide a reference for solving the damage problems caused by oil-based drilling fluids in fractured tight sandstone gas reservoirs.

Multiscale Formation Damage Mechanisms and Control Technology for Deep Tight Clastic Gas Reservoirs

SPE Journal ◽  
2021 ◽  
pp. 1-16
Author(s):  
Yijun Wang ◽  
Yili Kang ◽  
Lijun You ◽  
Chengyuan Xu ◽  
Xiaopeng Yan ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Damage Control ◽  
Production Capacity ◽  
Damage Mechanism ◽  
Field Application ◽  
Formation Damage ◽  
Fluid Loss ◽  
Drilling Process ◽  
Gas Reservoirs ◽  
Filtration Loss

Summary Severe formation damage often occurs during the drilling process, which significantly impedes the timely discovery, accurate evaluation, and efficient development of deep tight clastic gas reservoirs. The addition of formation protection additives into drilling fluid after diagnosing the damage mechanism is the most popular technique for formation damage control (FDC). However, the implementation of traditional FDC measures does not consider the multiscale damage characteristics of the reservoir. The present study aims at filling this gap by providing a complete and systematic damage control methodology based on multiscale FDC theory. First, the characteristics of multiscale seepage channels were described through petrology, petrophysics, and well-history data. Subsequently, based on laboratory formation damage evaluation experiments, the formation damage mechanism of each seepage scale was determined. Finally, based on the multiscale formation damage mechanism, a systematic multiscale FDC technology was proposed. Through the use of optimized drilling fluid based on multiscale FDC theory, high-permeability recovery ratio (PRR), high-pressure bearing capacity of plugging zone, and low cumulative filtration loss were observed by laboratory validation experiments. Shorter drilling cycle, less drill-in-fluid loss, lower skin factor, and higher production rates were obtained by using the optimized FDC drilling fluid in field application. This multiscale FDC theory shows excellent results in minimizing formation damage, maintaining original production capacity, and effectively developing gas reservoirs with multiscale pore structure characteristics.

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