Development and Application of Horizontal Drilling Technology Onland in China

1998 ◽  
Author(s):  
Guanging Wang ◽  
Yinao Su ◽  
Yuhui Zhou
Keyword(s):  
Horizontal Drilling ◽  
Drilling Technology

Improved Efficiency of Multi-Stage Fracturing Operations: An Innovative Pressure Activated Toe Sleeve

2015 ◽  
Author(s):  
Feng Yuan ◽  
Chris Palmer ◽  
Eric Blanton ◽  
John Tough
Keyword(s):  
Oil And Gas ◽  
Operating Efficiency ◽  
Productive Capacity ◽  
Horizontal Drilling ◽  
Pressure Testing ◽  
Multi Stage ◽  
Fracturing Process ◽  
Open Hole ◽  
Drilling Technology ◽  
Pressure Cycle

Abstract Over the last decade productive capacity of both oil and gas from previously uneconomic North American unconventional shale resources has been dramatically enhanced due to advanced horizontal drilling technology combined with multi-stage hydraulic fracturing treatment maximizing access to productive zones. Currently two types of multi-stage fracturing completion systems are in common use: The conventional Plug-and-Perf (P-n-P) method in cased holeFrac sleeves using open hole (OH) packers or cementing to isolate multiple stages To streamline the fracturing process, a new pressure-activated toe sleeve has been developed for both methods which is run in the hole on the bottom of the completion string and actuated after two pressure applications. This sleeve isn't immediately open after the first pressure application, so casing integrity pressure testing can be conducted and pressure can also be held indefinitely to satisfy a range of regulatory requirements. As the second application of pressure is bled down, the sleeve locks open and then composite plugs for P-n-P or balls for frac sleeves can be pumped down to begin subsequent stimulation operations. This toe sleeve is especially beneficial in P-n-P completions, as an alternative to tubing conveyed perforating (TCP) to initiate pump-down operations, eliminating the initial perforation run. As a result the following features and benefits can be realized: This toe sleeve is is hydraulically actuated after two separate pressure cycles applicationsEach pressure cycle application can be held indefinitely for casing integrity pressure testing to satisfy all expected regulatory requirementsThere is no restriction on the time between two pressure applicationsIt eliminates the need for TCP perforating in the first stage of a cemented P-n-P completion at the toe of wellMultiple sleeves can be installed and activated open simultaneously at the toe of the completion stringThe toe sleeve design incorporates port areas sufficient to pump the first stimulation operation, adding an additional zone to any fracturing completion The toe sleeve is fully cement compatibleThis paper will present the operational mechanisms and a case study of the use of this unique toe sleeve which adds significant operating efficiency and lowers the cost of multi-stage fracturing with valid casing integrity pressure test.

scholarly journals Cuttings Transport Models and Experimental Visualization of Underbalanced Horizontal Drilling

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Na Wei ◽  
YingFeng Meng ◽  
Gao Li ◽  
LiPing Wan ◽  
ZhaoYang Xu ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Transport Theory ◽  
Flow Mechanism ◽  
Cuttings Transport ◽  
Transport Models ◽  
Horizontal Drilling ◽  
Injection Volume ◽  
Drilling Technology ◽  
Large Plane ◽  
Core Issues

Aerated underbalanced horizontal drilling technology has become the focus of the drilling industry at home and abroad, and one of the engineering core issues is the horizontal borehole cleaning. Therefore, calculating the minimum injection volume of gas and liquid accurately is essential for the construction in aerated underbalanced horizontal drilling. This paper establishes a physical model of carrying cuttings and borehole cleaning in wellbore of horizontal well and a critical transport mathematical model according to gas-liquid-solid flow mechanism and large plane dunes particle transport theory.

Microseismicity-derived fracture network characterization of unconventional reservoirs by topology

2018 ◽  
Vol 6 (2) ◽  
pp. SE49-SE61 ◽  
Author(s):  
Ellie P. Ardakani ◽  
Adam M. Baig ◽  
Ted Urbancic ◽  
Katie Bosman
Keyword(s):  
Rock Mass ◽  
Network Connectivity ◽  
Fracture Network ◽  
Gas Production ◽  
Horizontal Drilling ◽  
Permeability Enhancement ◽  
Primary Zone ◽  
Drilling Technology ◽  
Secondary Zone ◽  
Stimulation Efficiency

The advent of horizontal drilling technology, combined with multistaged hydraulic fracturing to create a complex fracture network within the relatively impermeable rock mass, has made natural gas production from tight reservoirs economically feasible. Understanding of the generated fracture network properties, such as its spatial distribution, extension, connection, and ability to percolate, plays a significant role in evaluation of the stimulation efficiency, optimizing analytical frac models, and ultimately enhancing completion programs. We have developed a unique approach to understand the influence of fractures on fluid flow and production from impermeable reservoirs and evaluate completion effectiveness. We characterize the microseismicity-derived discrete fracture network in a North American shale-gas reservoir using modified scanline and topology methods. Using concepts of node and branch classification and assessing the number of connections (fracture intersections), the network connectivity is established volumetrically. The zones of permeability enhancement are then identified using the connection per branch and line ([Formula: see text] and [Formula: see text]), tied to percolation thresholds of the fracture system. These zones consist of a primary zone with a high proportion of doubly connected fractures, a secondary zone populated with partially connected fractures, and a tertiary or unstimulated zone dominated by isolated fractures. These divisions are reflected in the deformation that is observed in the reservoir as measured through a cluster-based description of the microseismicity. The primary and secondary zones are considered spanning fracture clusters, and they take part in production, whereas the tertiary zone is recognized as nonspanning fractures, and though it may enhance the bulk permeability of the rock mass, it is unlikely to contribute to reservoir production.

Horizontal Drilling Technology with Cycling Using of Inert Foam

1996 ◽  
Author(s):  
Y.F. MENG ◽  
P.Y. Lou ◽  
D. Jiao ◽  
R.K. Lao
Keyword(s):  
Horizontal Drilling ◽  
Drilling Technology
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