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• W4254263127 abstract "A New Completion Technology With Separate Layer Fracturing and Commingled Producing in Gas Field Gangdan Fu Gangdan Fu Changqing Oil Field Res. Inst. Search for other works by this author on: This Site Google Scholar Paper presented at the International Oil & Gas Conference and Exhibition in China, Beijing, China, December 2006. Paper Number: SPE-104444-MS https://doi.org/10.2118/104444-MS Published: December 05 2006 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Fu, Gangdan. A New Completion Technology With Separate Layer Fracturing and Commingled Producing in Gas Field. Paper presented at the International Oil & Gas Conference and Exhibition in China, Beijing, China, December 2006. doi: https://doi.org/10.2118/104444-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Oil and Gas Conference and Exhibition in China Search Advanced Search AbstractIn Changqing gas field, it is very usual that a gas well contains many gas bearing beds, whose property is different with each other. Because of the low formation pressure and low permeability, the nature rate is so small that every well must be treated. However, when treating these multi-layer wells, the conventional separate fracturing is not effective or cost-effective, and needs long time. To make all the beds treated effectively, to improve individual well producing rate and enhance economic benefit, optimizing several kinds of separate layer treatment technology and analyzing the feasibility of commingled producing in Changqing gas field. Through 3 years research and piloting, a new completion string has been introduced.This new technology is achieved by plugging of the packers and opening of the sand blast sleeve. Using the technology and completion string, three formations can be fractured continuously, but needn't kill well. Firstly, perforating all the three gas layers at a time, at the same time assembling the completion string, then tripping it in the gas well; secondly, launching a ball to make packers set down, and fracturing the lower most layer; thirdly, launching a ball again to open the upper sand blast sleeve so that the upper layer is connected with the tubing and isolated with the sub layer, so the second layer can be fractured. Similarly, and the last layer can be treated like this step. Finally, when all the layers have been treated, unloading liquids of all layers, blowouting and producing. During fracturing, if sand plug happens, it can be solved by reverse washing. The strong point of this technology is that all the processes are made in the same string and needn't exchange string.The technology has been used in about 150 gas wells till 2006, which indicates that it has advantage of favorable mechanical plugging, easy to implement, high rate of delivery, no damaged to formation, high completion well rate, low operating cost for single well. Therefore, the new completion technology and string is very perspective, especially for low permeable, low formation pressure gas reservoir.This paper describes the principle, the parameter and function of each tool, operation procedure, advantages and application of using the technology.IntroductionIn Changqing gas field, the reservoir geology is complex: many gas-bearing beds, different physical properties between formations, low permeability, low formation pressure and low abundance. And the natural production is so small that each well must be treated. For a multi-layer gas well, the conventional method is following: perforating the first bed, and treating it, then killing well and bridging the hole; then operating the next bed like preceding step. However, this way needs to trip frequently, long operation cycle and high cost. In addition, it is damaged to the formation for killing the well. Therefore, to exploit the thin and multi-layer gas well effectively, it is necessary to find other technology to treat the multi-layer gas well. Through researching for 3 years and testing in 150 wells, Separate Layer Treatment and Commingled Producing Technology has been found out, which is obvious for enhancing single gas production and economic benefit.The feasibility analysis of Commingled Producing in Changqing gas fieldGenerally speaking, if there is no serious interlayer interference or interzonal cross flow in a gas well, it is believed that the well is fit for Commingled Producing. There are two conditions to decide whether a well can produce in the way of Commingled Producing or not. One is that there is no water yield formation and the producing fluids are similar; the other is that the gas flowing pressure is lower than the gas formation pressure for each gas formation.Some multi-layer wells have been isolated tested on the condition of separate zone production (test 1) and commingled producing (test 2) respectively. The test data are given in table 1.From table 1, it is seen that the interlayer pressure difference is very small. And the bottom hole flowing pressure is smaller than the hydrostatic. When a gas well produces with commingled producing, both two pay sections produce at the same time. There is no interzonal cross flow between formations. Therefore, it is feasible for commingled producing used in Changqing gas field. Keywords: hydraulic fracturing, completion equipment, upper layer, Changqing gas field, separate layer treatment, flow in porous media, Fluid Dynamics, cement, new completion technology, Upstream Oil & Gas Subjects: Hydraulic Fracturing, Reservoir Fluid Dynamics, Flow in porous media, Completion Selection and Design, Completion equipment This content is only available via PDF. 2006. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4254263127 title "A New Completion Technology With Separate Layer Fracturing and Commingled Producing in Gas Field" @default.
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