Study on Drilling and Completion Techniques of Horizontal well for Coalbed Methane

2014 ◽  
Vol 513-517 ◽  
pp. 2586-2589 ◽  
Author(s):  
Xin Feng Du ◽  
Yong Zhe Zhao
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Horizontal Well ◽  
Horizontal Wells ◽  
Mining Area ◽  
Variable Density ◽  
Technical Problems ◽  
Development Direction ◽  
Drilling Technology ◽  
The Many

Due to the unique reservoir characteristics of the coalbed methane (CBM) in China, many technical problems have to be studied and solved in the development of horizontal wells for CBM. In this paper, based on the V-type wells, we have summarized the many techniques involved in Drilling and completion of horizontal well for CBM in Binchang mining area, such as leakage protection and sealing, geosteering while drilling, remote connection, variable density cementing, Coal seam cavitation, fiberglass casing running into the well, and etc. It is pointed out that the air foam under-balance drilling will be the development direction for coalbed methane drilling technology.

Study on Coalbed Methane well Type Optimization of Badaowan Formation in Junggar Basin

2014 ◽  
Vol 535 ◽  
pp. 622-625
Author(s):  
Cheng Long Liu ◽  
Hui Guo ◽  
Xiang Hao Wang ◽  
Jin Wang
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Evaluation System ◽  
Horizontal Well ◽  
Evaluation Method ◽  
Junggar Basin ◽  
Fuzzy Evaluation ◽  
Ahp Method ◽  
Well Drilling ◽  
Coal Seam Thickness

This paper applies AHP method and fuzzy evaluation method to establish evaluation system of CBM well type in Junggar Basin. Conclusions are drawn as follows: weight of each factor which determines well type optimization is very different, coal seam depth is 0.402, coal seam thickness is 0.295, coal permeability is 0.163, coal seam dip is 0.14. Sikeshu area and center of the basin is not suitable for CBM ground drilling. Changji to Fukang area and Muleihasakexian to Wucaiwan area and East Wuerhe area are favorable for vertical well drilling. Jimusaer area is favorable for horizontal well drilling. Other areas in Junggar Basin need vertical and horizontal well joint drilling.

Analysis of Complex Drilling Accidents in Silurian System of Shuntuoguole Block

2013 ◽  
Vol 868 ◽  
pp. 610-613 ◽  
Author(s):  
Hang Wen ◽  
Mian Chen ◽  
Jing Nan Dong
Keyword(s):  
Horizontal Well ◽  
Penetration Rate ◽  
Horizontal Wells ◽  
Drilling Speed ◽  
Technology Research ◽  
Research Directions ◽  
Well Drilling ◽  
Well Field ◽  
Drilling Technology ◽  
Mud Loss

There are 10 wells located in the Shun 9 well field in Silurian system of Shuntuoguole block, 7 of them were drilled wells. The statistics of complex drilling accidents indicated that tight pull, sticking of drill tools, pump blocked and mud loss were major types of drilling accidents in building section of horizontal wells. Specially. The high drill resistance of the formation caused low penetration rate and frequently bits replacing. As a consequence, the exploration rate in this area was severely restrained. We proposed the following three technical research directions: anti-collapse technology research, long-reach horizontal well drilling technology research and countermeasures of enhancing drilling speed segment by segment along the well.

Analysis of Distribution of Coalbed Methane and Geological Controlling Factors in Huanghebei Mining Area

2013 ◽  
Vol 448-453 ◽  
pp. 3757-3761
Author(s):  
Yan Ru Meng ◽  
Zeng Xue Li ◽  
Hai Yan Liu ◽  
Nan Jiang ◽  
Juan Liu
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Mining Area ◽  
Controlling Factors ◽  
Methane Content ◽  
Burial Depth ◽  
Distribution Characteristics ◽  
Deep Well ◽  
Hydrogeological Conditions ◽  
Geological Factors

Distribution characteristics of coalbed methane in Huanghebei mining area were studied and influence of geological factors such as faults, lithology of coal seam roof and floor, magmatic activities, burial depth and upper bedrock thickness of coal seam and hydrogeological conditions on occurrence of coalbed methane were deeply discussed in this paper. Coalbed methane content of mining area increased gradually from southeast to northwest. Coalbed methane in deep well points of mining area is dominated by methane and that in shallow parts contained higher content of nitrogen.

scholarly journals Numerical Simulation Research on Well Pattern Optimization in High–Dip Angle Coal Seams: A Case of Baiyanghe Block

2021 ◽  
Vol 9 ◽  
Author(s):  
Hongli Wang ◽  
Xiao Zhang ◽  
Suian Zhang ◽  
Hongxing Huang ◽  
Jun Wang
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Horizontal Well ◽  
Gas Production ◽  
Low Rank ◽  
Water Migration ◽  
Coal Seams ◽  
Well Pattern ◽  
Dip Angle ◽  
Desorption Model

The Baiyanghe block in Fukang, Xinjiang, China, is rich in coalbed methane (CBM) resources, and several pilot experimental wells have yielded high production. Due to the high dip angle (35–55°) of the coal seam in this area, the lack of understanding of the geological characteristics, the physical properties of coal, and gas–water migration law lead to immature development techniques and poor overall development benefits. We first conducted desorption and adsorption tests on low-rank coal of this area and found residual gas in the coal. We established a coalbed methane desorption model suitable for this area by modifying the isotherm adsorption model. Next, by analyzing the influence of the gas–water gravity differentiation in the high–dip angle coal seam and the shallow fired coalbed methane characteristics in this area, we discovered the leakage of CBM from the shallow exposed area of the coal seam. Given the particular physical property of coal and gas–water migration characteristics in this area, we optimized the well pattern: (i) the U-shaped along-dip horizontal well group in coal seams is the main production well for gas production with a spacing distance of 312 m; (ii) a multistage fracturing well drilled in the floor of coal is for water production; and (iii) vertical wells with a spacing distance of 156 m in the shallow area is to capture CBM leakage. Using numerical simulation and net present value (NPV) economics models, we optimized the well pattern details. Applying our CBM desorption model, the numerical simulator can improve the accuracy of the low-rank coalbed methane productivity forecast. The optimization results demonstrated the following: 1) the cumulative gas production of single U-shaped well increased by 89% with the optimal well spacing, 2) the cumulative gas production of the well group increased by 87.54% after adding the floor staged horizontal well, and 3) the amount of CBM leakage decrease by 67.59%.

scholarly journals Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1498 ◽  
Author(s):  
Qing Tian ◽  
Yudong Cui ◽  
Wanjing Luo ◽  
Pengcheng Liu ◽  
Bo Ning
Keyword(s):  
Coalbed Methane ◽  
Horizontal Well ◽  
Radial Flow ◽  
Horizontal Wells ◽  
Flow Coefficient ◽  
Diffusion Flow ◽  
Fracture Conductivity ◽  
Wellbore Storage ◽  
Planar Angle ◽  
Fractured Horizontal Wells

Horizontal wells with multi-stage fractures have been widely used to improve coalbed methane (CBM) production from coalbed methane reservoirs. The main focus of this work is to establish a new semi-analytical method in the Laplace domain and investigate the transient pressure behavior in coalbed methane reservoirs. With the new semi-analytical method, flow regimes of a multi-fractured horizontal well in coalbed methane reservoirs were identified. In addition, the sensitivities of fracture conductivity, diffusion model, storability ratio, inter-porosity flow coefficient, adsorption index, fracture spacing, fracture asymmetry, non-planar angle, and wellbore storage were studied. Results indicate that six characteristic flow regimes can be identified for multi-fractured horizontal wells in coalbed methane reservoirs, which are bilinear flow, first linear flow, desorption-diffusion flow, first pseudo-radial flow, second linear flow, and second pseudo-radial flow. Furthermore, the sensitivity analysis shows that the early flow is mainly determined by the fracture conductivity, the asymmetry factor, the non-planar angle, and the wellbore storage; while the desorption-diffusion flow regime is mainly influenced by the diffusion model, the storability ratio, the inter-porosity flow coefficient, the adsorption index, and the fracture spacing. Our work can provide a deep insight into the fluid flow mechanism of multi-fractured horizontal wells in coalbed methane reservoirs.

scholarly journals Horizontal well workover technology present situation and development trend

2021 ◽  
Vol 261 ◽  
pp. 01049
Author(s):  
Guohui Zhang ◽  
Peng Wang ◽  
Rong Chen ◽  
Baoping Duan ◽  
Guowen Zhang ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Complex Structure ◽  
Horizontal Wells ◽  
Development Trend ◽  
Low Permeability ◽  
Drilling Technology ◽  
Combined Action ◽  
Axial Compressive Stress ◽  
High Level ◽  
Low Permeability Reservoirs

In the downhole operation of horizontal Wells, the pipe string is subjected to the combined action of many kinds of loads. The pipe string may bend sinusoidal or spiral under the action of axial compressive stress, which will also increase the friction between the pipe string and the wellbore wall. Because of the existence of friction, to the milling, salvage, unstuck, sand and other construction to bring adverse effects. This paper describes the characteristics of horizontal well in fishing, sand washing, unlocking and casing milling. The paper introduces the development of horizontal well application, such as drilling technology matching for complex structure wells, high-level completion of lateral Wells, radial lateral wells in low permeability reservoirs and supporting technology for completion and production of horizontal wells.

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