First Hydraulic Fracturing from a Supply Vessel in the Caspian Sea Offshore Russia

2012 ◽  
Author(s):  
Vladimir Stenin ◽  
Sergej Delia ◽  
Vladimir Levchenko ◽  
Sergei Alexandrovich Vereschagin ◽  
Kreso Kurt Butula ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Caspian Sea ◽  
The Caspian Sea

First Multistage Hydraulic Fracturing in Russian Offshore: Integrated Approach to Completion and Stimulation of Apt Deposits of V.Filanovsky Field

2021 ◽  
Author(s):  
Mikhail Yurievich Golenkin ◽  
Denis Vladimirovich Eliseev ◽  
Alexander Anatolyevich Zemchikhin ◽  
Alexey Alexandrovich Borisenko ◽  
Akhmat Sakhadinovich Atabiyev ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Caspian Sea ◽  
Complex Type ◽  
The Caspian Sea ◽  
Multistage Hydraulic Fracturing ◽  
Coiled Tubing ◽  
Sand Control ◽  
Friction Reducing ◽  
First Time ◽  
Stimulation Of

Abstract The paper describes the results of the first multistage hydraulic fracturing operations in Russia on the Caspian Sea shelf in the gas condensate and oil deposits of the Aptian formation of V. Filanovsky field. In addition to the small productive formation depth, long horizontal sections with a complex trajectory and high collapse gradients due to large zenith angles when passing the Albian and Aptian deposits of poorly consolidated sandstones are an additional challenge for choosing a multistage hydraulic fracturing assembly. The above features require the use of modern sand control screens with enhanced frac sleeves. A design was developed which includes frac sleeves and sand control screens that can withstand multiple cycles of hydraulic impact during hydraulic fracturing, as well as many opening/closing cycles. A seawater-based frac fluid system was applied. The frac fleet was located on a pontoon, the coiled tubing – on a platform. For the first time in Russia, a 2-5/8 inch coiled tubing with a complex-type friction reducing system was used to switch coupling/sleeves in conditions of very long horizontal sections, complex trajectories, and high friction coefficients. The minimum distances between the screen's sliding sleeves and frac sleeves did not prevent from performing manipulations in complex environment. For well cleaning, the frac assemblies of reverse rotary-pulse and rotary-directional types were used. At the first stage of the project, the development of an optimal method of well completion was successfully implemented. Due to the close interaction of the operating company, service company, and science & engineering team of the operator, for the first time in Russia the design of downhole equipment with the use of advanced technologies of sand control screens, frac sleeves was presented. This solution has proved its effectiveness – the downhole equipment has retained its operational properties after a long period of well operation and further in the process of hydraulic fracturing. At the second stage of the project, 32 MSHF operations were performed at four wells. To reduce nonproductive time and operational risks, a satellite communication complex was additionally deployed on the pontoon to join the engineering centers of Astrakhan, Moscow, and Houston. After finishing the well development, the design indicators for formation fluid rates were achieved, which proved the effectiveness of the stimulation of the field's target objects – this opens great prospects for further development of low-permeability reservoirs at offshore sites in the Caspian Sea. The successful project implementation and the achievement of the design values of oil flow rates has expanded the possibilities of commercial operation of the low-permeable Aptian formation, complicated by the presence of a gas cap and underlying water. A solution was presented for working in extended horizontal well sections with 2-5/8 inch coiled tubing together with a complex-type mechanical friction reducing system. The economic effect was achieved when solving tasks of manipulating mechanical screen couplings and frac port sleeves without the involvement of downhole tractors. The use of new solutions in the completion assembly made it possible to eliminate additional sand ingress problems.

Optimized Coiled Tubing Approach in Offshore Multi-Stage Hydraulic Fracturing Project

2021 ◽  
Author(s):  
K. Rahimov ◽  
P. Correa ◽  
R. Sharipov
Keyword(s):  
Hydraulic Fracturing ◽  
Feasibility Study ◽  
Caspian Sea ◽  
Simulation Software ◽  
Design Stage ◽  
The Caspian Sea ◽  
Efficient Manner ◽  
Coiled Tubing ◽  
Multi Stage ◽  
Tubing String

Abstract Operator at the Russian segment of the Caspian sea offshore, engineered a project to drill and complete four experimental horizontal extended reach wells with very aggressive trajectories, into tight Oil & Gas bearing formations with further mission to complete them with multiple hydraulic fracturing. This resulted in a selection of complex completion design with multiple shifting sleeves to allow efficient multistage frac treatment and subsequent production of each zone. Technical challenge of the project was to deliver enough force into shifting sleeves to manipulate them with close-open-close cycle, in a horizontal extended reach wellbore with average 2800mMD (1900mTVD) with anticipated excessive proppant accumulation after each treatment, and it was expected to further restrict the required force delivery in extended reach wellbore. Challenges were addressed during well design stage, by using a proprietary engineering simulation software to analyze the large spectrum of the Coiled tubing string with different mechanical properties. Additionally, feasibility study, considered the application of downhole aids to overcome wellbore cleanout issues, helical buckling and friction lock-up, to deliver required force to the shifting devices. A critical part for the effective delivery of the operations was the time spent designing each intervention individually. Having the expertise to perform proper project management, provided the opportunity to identify several potential challenges that could appear during the campaign. Numerous simulations of tubing force analysis were performed, considering different string configurations, in the intent of overcoming the difficulties resulting from the unconventional trajectories of the wells. One important selection made, was the extended reach auxiliary options, which could aid in reaching the target depths with enough WoB to shift the sleeves. The feasibility study also included extensive simulations on options to remove solids from the wellbore on an efficient manner This paper details out the design specification of the Coiled Tubing technologies selected for the projects as well as address the engineering and operational challenges and solutions proposed to deliver the successful offshore campaign. First time use of the large 2 5/8" OD coiled Tubing string in Offshore Caspian sea and related operational and logistical challenges are the novelties discussed in this paper. Paper also highlights the operation sequence and success of the selected pipe design and downhole approach.

THE NUMBER AND QUALITATIVE CHARACTERISTICS OF FRY FISH IN SHALLOW COASTAL WATERS OF THE VOLGA IN THE SUMMER-AUTUMN PERIOD OF 2012

2017 ◽  
pp. 65-73
Author(s):  
Edward Vladimirovich Nikitin
Keyword(s):  
Fish Species ◽  
Coastal Waters ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Volga River ◽  
Commercial Fish ◽  
Autumn Period ◽  
Fish Juveniles ◽  
Qualitative Characteristics ◽  
Shallow Coastal Waters

Shallow coastal waters of the Volga river is a flooded feeding area for fish juveniles of nonmigratory fish species. There takes place annual downstream migration of fluvial anadromous fish species from spawning grounds of the Volga river to the Northern Caspian Sea. The most important factors determining the number and qualitative characteristics of fry fishes are the level of the Caspian Sea (currently having a tendency to the lowering), hydrological and thermal regimes of the Volga river. Researches were carried out in definite periods of time. In the summer-autumn period of 2012 fry fishes were presented by 19 species (13 of them were commercial species), which belonged to 9 families. The article gives data on all the commercial fish species. In the first decade of July the maximum number of fry fish was registered in the western part of the Volga outfall offshore - in box 247 (19.86 mln specimens/km2), in the eastern part - in box 142 (20.4 mln specimens/km2). The most populous were roach, red-eye, silver bream and bream; size-weight characteristics were better in the areas remoted from the Volga delta. In the third decade of July the quantitative indicators of fry fish on these areas decreased, size-weight characteristics greatly increased. In the second decade of October in the western part of the seaside there were registered increased pre-wintering concentrations of fish juveniles, their qualitative indicators increased, which is evidence to favorable feeding conditions in 2012.

On the type locality of the steppe ribbon racer, Psammophis lineolatus (Brandt, 1838) (Serpentes: Lamprophiidae)

2020 ◽  
Vol 324 (2) ◽  
pp. 262-272
Author(s):  
I.V. Doronin ◽  
T.N. Dujsebayeva ◽  
K.M. Akhmedenov ◽  
A.G. Bakiev ◽  
K.N. Plakhov
Keyword(s):  
Caspian Sea ◽  
Type Specimen ◽  
Type Locality ◽  
Eastern Coast ◽  
Zoological Museum ◽  
Western Coast ◽  
The Caspian Sea ◽  
Original Species ◽  
Academy Of Sciences ◽  
Made In

The article specifies the type locality of the Steppe Ribbon Racer. The holotype Coluber (Taphrometopon) lineolatus Brandt, 1838 is stored in the reptile collection of the Zoological Institute of the Russian Academy of Sciences (ZISP No 2042). Literature sources provide different information about the type locality. A mistake has been made in the title of the work with the original species description: the western coast of the sea was indicated instead of the eastern one. The place of capture was indicated as “M. Caspium” (Caspian Sea) on the label and in the reptile inventory book of the Zoological Museum of the Academy of Sciences. The specimen was sent to the museum by G.S. Karelin. The “1842” indicated on the labels and in the inventory book cannot be the year of capture of the type specimen, just as the “1837” indicated by A.M. Nikolsky. In 1837, Karelin was in Saint Petersburg and in 1842 in Siberia. Most likely, 1837 is the year when the collection arrived at the Museum, and 1842 is the year when the information about the specimen was recorded in the inventory book (catalog) of the Zoological Museum of the Academy of Sciences. In our opinion, the holotype was caught in 1932. From Karelin’s travel notes of the expedition to the Caspian Sea in 1832, follows that the snake was recorded in two regions adjacent to the eastern coast of the Caspian Sea – Ungoza Mountain (“Mangyshlak Mountains”) and site of the Western Chink of Ustyurt between Zhamanairakty and Kyzyltas Mountains (inclusive) on the northeast coast of Kaydak Sor (“Misty Mountains”). In our article, Karelin’s route to the northeastern coast of the Caspian Sea in 1832 and photographs of these localities are given. The type locality of Psammophis lineolatus (Brandt, 1838) should be restricted to the Mangystau Region of the Kazakhstan: Ungoza Mountain south of Sarytash Gulf, Mangystau (Mangyshlak) Penninsula (44°26´ N, 51°12´ E).

ICE CONDITIONS IN THE NORTH-WESTERN PART OF THE CASPIAN SEA IN THE MODERN PERIOD

2020 ◽  
Vol 19 (6) ◽  
pp. 4-17
Author(s):  
Nepomenko Leonid ◽  
◽  
Popova Natalia ◽  
Zubanov Stepan ◽  
Ostrovskaya Elena ◽  
...  
Keyword(s):  
Caspian Sea ◽  
The Caspian Sea ◽  
The North ◽  
Modern Period ◽  
Ice Conditions ◽  
North Western
Sign in / Sign up

Export Citation Format

Share Document