The Practice and Cognition of Tracing with Drilling in Fish Bone Horizontal Well

2012 ◽  
Vol 594-597 ◽  
pp. 226-229
Author(s):  
Kai Chun Yu ◽  
Yan Zhu ◽  
Xiao Xing Li ◽  
Shi Feng Zhang
Keyword(s):  
Horizontal Well ◽  
Horizontal Wells ◽  
Fish Bone ◽  
Drilling Process ◽  
Horizontal Section ◽  
Well Production ◽  
The North ◽  
Comprehensive Exploitation ◽  
Horizontal Length ◽  
Oilfield Development

The branch well G8-33-H1Z is the first fishbone horizontal well of Daqing. The fishbone horizontal well is one type of the branch horizontal wells, which drilling again two or more branch holes in the horizontal section of the horizontal well. This well lies in G21 block where is near to the west of Daqing oilfield Changyuan area and the northeast of G20 of the north Gaotaizi oilfield. The purpose of the drilling is using branch horizontal well to control more areal reserves and increasing drainable area to improve well production. This technique can improve the economic benefit of oilfield development, which saves drilling investment, makes full use of the upper borehole to improve the comprehensive exploitation degree of the reservoir and achieves highly efficient development using less well. This well has two horizontal branches, and puts ‘trunk-branch-trunk-branch’ into effect while drilling. The first branch designed horizontal length 150m. The second branch designed horizontal length 150m. This paper introduced the tracing with drilling process of Daqing first fishbone horizontal well, and also described the complex situations and the treatment methods while drilling wellbore trajectory and constructing well and the development effect. Finally some suggestions were put forward about tracing with drilling in fishbone horizontal well.

Experimental Research on Electric Analogy of Staged Fracturing of Horizontal Wells Flooding

2014 ◽  
Vol 955-959 ◽  
pp. 3484-3488
Author(s):  
Guang Zhong Lv ◽  
Jiang Qiao Zhang
Keyword(s):  
Horizontal Well ◽  
Horizontal Wells ◽  
Experimental Conditions ◽  
Horizontal Section ◽  
Fracture Length ◽  
Unidirectional Flow ◽  
Horizontal Length ◽  
Fractured Horizontal Well ◽  
Well Pattern ◽  
Penetration Ratio

An electrolytic simulation experiment was designed according to the water and electricity resembling principle. The pressure contour distribution and the effects of the productivity of the fractured horizontal well were experimentally studied under the flooding. The equal pressure lines around horizontal wells were elliptic, and the equal pressure lines were Parallelled distribution in the fracture of horizontal well, Flow states was unidirectional flow, indicating staged fracturing of horizontal well by improving Percolation way greatly reduce seepage resistance. Under the experimental conditions, staged fracturing horizontal waterflooding development best combination of parameters: row and staggered well pattern, penetration ratio of horizontal section was 0.8, the number of fractures should be 6 (fracture space was 91m), penetration ratio of fracture was 0.25, the angle between the fracture and horizontal well is 90 degree. The importance ranking of productivity was horizontal length, the number of fractures (fracture space ),fracture length, he angle between the fracture and horizontal well and well-pattern type.

Successful Unlock for Non-Continuous Sand of Tight Gas Reservoir using Horizontal Wells

2021 ◽  
Author(s):  
Raed Mohamed Elmohammady ◽  
Mostafa Mahrous Ali ◽  
Hassan Elsayed Salem
Keyword(s):  
Horizontal Well ◽  
Horizontal Wells ◽  
Western Desert ◽  
Tight Gas ◽  
Vertical Wells ◽  
Gas Reservoir ◽  
Horizontal Section ◽  
Reservoir Permeability ◽  
Wide Range ◽  
Tight Gas Reservoir

Abstract Reservoir development in Safa Formation requires a lot of vertical wells in order to exploit the gas reserve in the formation which means high cost is needed because the heterogeneity in the formation is noticed due to sandstone is pinched out in different locations of the reservoir. So, vertical well may be sweep from limited area of the reservoir that make safa formation has less priority for new activities. Form all of that the plan was drilling horizontal wells with long horizontal section to recover great volume of gas from reservoir. In addition to reduction in number of drilling vertical wells in the reservoir. In contrast, the major constrains is the small thickness of reservoir that make drilling horizontal section is very difficult. The main characteristics of safa formation is non continuous sandstone in the whole reservoir with great heterogeneity that not controlled by any points in the reservoir for the distribution of sandstone. In addition, there are a lot of locations in safa formation that include lean intervals which have kaolinite, elite that are not capable for produce from sand. In other hand, there is another constrains beside the discontinuity of sand production is the heterogeneity of permeability properties of reservoir that change in wide range across the reservoir with minimum range of 0.01 md and increase in some locations to reach 100 md. From all of the previous, it is a big challenge in drilling horizontal wells with long horizontal section in thin reservoir thickness in order to access the best reservoir permeability and optimize the number of drilling wells based on this concept. This paper will discuss case study of unlock and development long horizontal section in gas reservoir characterized by its tightness. The main goal of this horizontal well to recover ultimate gas reserve from safa formation by horizontal section reached to 2000 meter with a challenge because it is abnormal to drill this large horizontal section in western desert of Egypt in reservoir thickness range from 5 meter to 30 meter as prognosis from other offset wells in case of there is no pitchout of the sandstone. After Drilling of first horizontal well, the results were unexpected because the well penetrates a large horizontal section of sandstone in safa formation. This section reached to around 1750 meter with average reservoir permeability between 10 – 20 md and the reservoir porosity about 13% with good hydrocarbon saturation that changes along this section from 75% to 80%. So, this well put on production with very stable gas production rate 20 MMSCFD. In this paper will discuss in details the different challenge that faced to unlock this tight gas reservoir and will discuss the performance of horizontal well production. In this paper will discuss the first horizontal well in safa formation and the longest horizontal section in western desert of Egypt in tight gas formation that has a lot of challenges and risks are faced. After success the concept of horizontal well in heterogeneous reservoir, the next plan is the development of this reservoir using several horizontal wells to recover the ultimate recovery of gas from safa formation.

Efficient Proppant Flowback Prevention Strategy Allows Production of a Multi Fractured Offshore Horizontal Well Equipped with ESP and Screenless Completion

2014 ◽  
Author(s):  
F.. Martocchia ◽  
S.. Baretti ◽  
L.. Farina ◽  
G.. Rizza ◽  
F.. Okassa ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Selection Process ◽  
Horizontal Wells ◽  
Control Device ◽  
Well Production ◽  
Multi Stage ◽  
Temperature Activation ◽  
Fractured Well ◽  
Chemical Activator ◽  
Selection Of

Abstract When production facilities are not equipped with a solid control device, proppant flowback becomes an issue throughout the entire productive life of a screenless multi fractured well. The challenge of minimizing proppant flowback is even more critical when dealing with offshore horizontal wells with ESP systems installed. A wide selection of proppant flowback prevention additives is now available in the industry: most of them work either chemically or mechanically. At low formation temperature (150 F), the effectiveness of some additives such as resin coated proppant or fiber can be limited due to the temperature activation. This paper will describe a successful strategy of proppant flowback control which was implemented in a multi stage fracturing treatment on a horizontal well in M- field, offshore Congo. It is the combination of resin coated proppant, enhanced by a chemical activator and inert fibers that provides double mechanism to eliminate proppant flowback issues during well production and sustaining life of ESP. Success in this multi stage fracturing treatment has resulted in oil production from a pay zone that has never been produced due to poor petrophysical characteristics. This document will describe: proppant flowback control additives selection process, placement strategy, hydraulic fracturing design and well execution considerations for multi stage fracturing treatments.

Geomechanical analysis of horizontal wells in terms of stability for drilling — A case study from the Peri-Baltic Syneclise

2021 ◽  
Vol 40 (11) ◽  
pp. 805-814
Author(s):  
Michał Kępiński ◽  
Pramit Basu ◽  
David Wiprut ◽  
Marek Koprianiuk
Keyword(s):  
Horizontal Well ◽  
Oil And Gas ◽  
Horizontal Wells ◽  
Microseismic Monitoring ◽  
Earth Model ◽  
Gas Field ◽  
Horizontal Section ◽  
Stress Regime ◽  
Geomechanical Analysis

This paper presents a shale gas field geomechanics case study in the Peri-Baltic Syneclise (northern Poland). Polish Oil and Gas Company drilled a vertical well, W-1, and stimulated the Silurian target. Next, a horizontal well, W-2H, drilled the Ordovician target and partially collapsed. The remaining interval was stimulated, and microseismic monitoring was performed. A second horizontal well, W-3H, was drilled at the same azimuth as W-2H, but the well collapsed in the upper horizontal section (Silurian). A geomechanical earth model was constructed that matches the drilling experiences and well failure observations found in wells W-1, W-2H, and W-3H. The field was found to be in a strike-slip faulting stress regime, heavily fractured, with weak bedding contributing to the observed drilling problems. An analysis of safe mud weights, optimal casing setting depths, and optimal drilling directions was carried out for a planned well, W-4H. Specific recommendations are made to further enhance the model in any future studies. These recommendations include data acquisition and best practices for the planned well.

Research on Optimization of Perforated Horizontal Wells with Separated Production Scheme Based on Genetic Algorithm

2014 ◽  
Vol 1044-1045 ◽  
pp. 495-502
Author(s):  
Shan Liu ◽  
Deng Ke Tong ◽  
Shu Heng Tang
Keyword(s):  
Genetic Algorithm ◽  
Horizontal Well ◽  
Constant Pressure ◽  
Horizontal Wells ◽  
Optimization Models ◽  
Well Production ◽  
Production Scheme ◽  
Numerical Stimulation ◽  
High Production ◽  
New Reservoir

Based on the separated production scheme of perforated horizontal well, the production is closely related to the number, length and location of horizontal intervals. New reservoir / wellbore coupling models were modeled which included two boundaries: closed boundary and constant pressure boundary. For these coupling models, two new optimization models were modeled, which took the production as the objective function and took the length and location of horizontal intervals as the optimization variables. Then the numerical calculation models were proposed by using the Gauss-Laguerre quadrature formula. Applying the genetic algorithm and writing the numerical stimulation software, the optimized schemes with 2 segments, 3 segments and 4 segments for planning intervals of the perforated horizontal wells were presented. By comparing the optimized schemes, we can see that the horizontal well production was not infinite increasing with the length of horizontal intervals, but only in the suitable length of horizontal intervals to maintain high production. And it is not the more segments the higher production. For the perforated horizontal well in closed reservoir, the production was the highest based on the optimized schemes with 3 segments.

scholarly journals Drag-Reduction Performance Evaluation of Controllable Hybrid Steering Drilling System

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jianyan Zou ◽  
Ping Chen ◽  
Tianshou Ma ◽  
Yang Liu ◽  
Xingming Wang
Keyword(s):  
High Efficiency ◽  
Vertical Section ◽  
Drilling Fluid ◽  
Horizontal Wells ◽  
Friction Reduction ◽  
Drilling Process ◽  
Drag Torque ◽  
Horizontal Section ◽  
Drilling System ◽  
Friction Reducing

The excessive drag/torque and the backing pressure is an important factor that restricts the improvement of the penetration rate and the extension of the drilling in the sliding drilling process of extended-reach wells and horizontal wells. To deal with this problem, this paper developed a novel controllable hybrid steering drilling system (CHSDS) based on the friction-reducing principle of a rotating drill string. The CHSDS is composed of a gear clutch, hydraulic system, and measurement and control system. By controlling the meshing and separation of the clutch with the mud pulse signal, the CHSDS has two working states, which leads to two boundary conditions. Combined with the stiff-string drag torque model, the effects of the drilling parameters on the friction-reducing performance of the CHSDS are analyzed systematically. The results show that the friction reduction effect in the inclined section is the most significant, followed by that in the horizontal section, whereas there is almost no impact in the vertical section. Friction reduction increases with the rotary speed and the drilling fluid density, whereas it decreases with the increase in the surface weight-on-bit and the bit reaction torque. Field tests confirm the separation and meshing function of the CHSDS. The developed controllable hybrid steering and friction-reducing technology provides an alternative approach for the safe and high-efficiency drilling of horizontal wells.

A Novel Approach of Cuttings Transport with Bubbles in Horizontal Wells

2012 ◽  
Vol 524-527 ◽  
pp. 1314-1317 ◽  
Author(s):  
Ying Ying Li ◽  
Guan Cheng Jiang ◽  
Ling Li ◽  
Wei Xing Xu ◽  
Zhi Heng Zhao
Keyword(s):  
Surface Area ◽  
Drilling Fluid ◽  
Horizontal Wells ◽  
Experimental Results ◽  
Drilling Process ◽  
Cuttings Transport ◽  
Horizontal Section ◽  
Transport Effect ◽  
Novel Approach ◽  
Cutting Bed

Aiming at the cutting bed settling problems in horizontal section during drilling process, a novel additive FGC for cuttings transport is applied. The experimental results show that the wettability was converted to amphiphobic and the cuttings preferentially attached to gas bubbles after FGC adsorption on the cuttings’ surface. The surface area of the cuttings is increased and the density of it is reduced, making cuttings more easily to be driven by liquid and settlement decrease. Tested by the horizontal simulation device, the cuttings transport effect is good and most of cuttings can be circulated to the outlet position by drilling fluid.

Effect of 2-Phase Oil-Water Flow and Friction Pressure Loss in the Wellbore on Water Cresting in Horizontal Wells

2002 ◽  
Author(s):  
Solomon O. Inikori ◽  
Andrew K. Wojtanowicz
Keyword(s):  
Horizontal Well ◽  
Horizontal Wells ◽  
Published Data ◽  
Well Performance ◽  
Horizontal Pipe ◽  
The North ◽  
Water Breakthrough ◽  
Water Coning ◽  
Major Factors ◽  
Analytical Tools

Horizontal well application to mitigate water coning problems have gained wide industry acceptance. However, horizontal wells themselves have not been free from water coning (cresting) problems. A major challenge before industry operators is the effective modeling of water crest development in horizontal wells. More often, mathematical models developed for fluid flow in horizontal pipes have been adopted for modeling horizontal well performance but these have been largely inadequate. This paper presents a more encompassing tool for evaluating the performance of horizontal wells with bottom water drive which incorporates all the effects of perforations, 2-phase liquid-liquid flow and axial influx of fluid into the wellbore. A new value of equivalent pipe roughness function is developed for use in the numerical simulators to accommodate the inadequacies of the current commercial softwares. The empirical results using published data from the North Sea indicate a more practical representation of the phenomenon of water cresting in horizontal wells and the level of severity. Two major factors affected by the application of the new approach are; a reduction in the time to water breakthrough as previously predicted by analytical tools, and an effective representation of the geometry of water cresting in horizontal wells similar to field experiences. The paper also shows that direct application of horizontal pipe models in horizontal well is grossly inadequate. Finally it shows use of horizontal wells in the development of reservoirs underlain by water needs adequate evaluation.

Study on Extended Reach Horizontal Well Multistage Fracturing Techniques for Tight Oil

2014 ◽  
Vol 1073-1076 ◽  
pp. 2219-2222
Author(s):  
Xin Tan ◽  
Ting Ting He ◽  
Fu Qun Wang
Keyword(s):  
Horizontal Well ◽  
Horizontal Wells ◽  
Oil Price ◽  
Tight Oil ◽  
Fracturing Fluid ◽  
Construction Costs ◽  
Fracturing Fluids ◽  
Horizontal Length ◽  
Cardium Formation ◽  
Pilot Tests

Tight oil can be commercially recovered by horizontal well multistage fracturing. With the development of multistage fracturing tools, extended reach horizontal well could be a way to enhance unconventional tight oil economical efficiency. On the base of the study on Cardium formation, fracturing fluids were analyzed and slick water fracturing fluid was optimized. Frac port multistage fracturing string was studied and applied in pilot tests. Three extended reach horizontal wells with average 40 stages and 2954m horizontal length pilot tests were applied and studied. Comparison of well costs and production between extended reach horizontal wells and offset short horizontal wells were studied, extended horizontal reach wells get much more profits after six months producing when oil price above 101 CAD/bbl, and save 50% well construction costs and producing management costs.

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