Concentric Coiled Tubing, Proven Sand Cleanout Technology for Sub-Hydrostatic Wells in Caspian Sea

2021 ◽  
Author(s):  
Emil Hasanov ◽  
Hajagha Mammadov ◽  
Pedro Correa
Keyword(s):  
Caspian Sea ◽  
Oil And Gas ◽  
Lessons Learned ◽  
Return Flow ◽  
Caspian Region ◽  
Coiled Tubing ◽  
Track Record ◽  
Tubing String ◽  
Successful Execution ◽  
Bottomhole Pressure

Abstract Index of sand production is one of the major issues faced in oil and gas wells on the Caspian region. Although there are multiple technologies to address this issue, the application of these technologies require the well to be cleaned before proceeding with any kind of remedial application. Concentric Coiled Tubing (CCT) sand vacuuming technology has brought a massive advantage for efficiently cleaning the wellbore of sub-hydrostatic wells in Caspian Sea. CCT system is the Coiled tubing string inside of Coiled tubing string which essentially provides a smaller second annular return route for the wellbore solids while simultaneously boosting the return pressure and allowing us to clean the sand where the bottomhole pressure (BHP) is low and not enough to support the circulation of fluids used for the cleanout. Cleanout fluid is pumped through the inner string to power the downhole jet pump comprised in CCT bottomhole assembly (BHA) which creates a drawdown that vacuums the solids and circulates the solids back to surface via the CCT annulus. The solid performance of the CCT system has an established track record worldwide and application of this sand cleanout technology brought a solution for recovering many wells with low BHP and has been successfully implemented since 2013, providing a method for cleaning out tons of accumulated sand particles from challenging wells in Caspian Region. With the complex system being used for cleaning out sand and also surface handling of the solids in the return flow from the wellbore, CCT sand vacuuming technology has proven to be effectively functioning in all cases that it was selected for so far. This Paper reviews the design and mechanism of the CCT sand/well vacuuming system as well as the results of several well intervention cases with its successful execution and lessons learned in Caspian region.

scholarly journals Caspian or Arctic region: that is the question…

2020 ◽  
Vol 6 (4) ◽  
pp. 427-437
Author(s):  
S. Y. Chernitsyna
Keyword(s):  
Legal Status ◽  
Oil And Gas ◽  
Arctic Region ◽  
Gas Production ◽  
Lessons Learned ◽  
The Arctic ◽  
Caspian Region ◽  
The Caspian Sea ◽  
Oil And Gas Production ◽  
The Arctic Region

The article compares the problems of two strategically important regions for Russia — the Caspian region and the Arctic region. Despite the fact that there are some significant geographical and climate differences, the geopolitical situation in the regions is similar. There are almost identical risks in the development of these regions. Special attention is paid to the issue of ecology in the conditions of active oil and gas production. The question concerning the instruments of regulation of interstate relations is sharply raised. International cooperation is essential in addressing key issues in the regions, such as improving socio-economic conditions, energy distribution and border management. In particular, it is necessary to define a regulatory framework that would meet the new realities in the Arctic. As for the international legal status of the Caspian sea, it was settled by the adoption of the Convention following the summit in 2018. The main difference is that the Caspian region was exposed to the anthropogenic factor much earlier. The lessons learned from the work in the Caspian region can be used in the Arctic region, which can reduce some of the risks associated with the interaction of coastal countries.

scholarly journals CORRELATION OF OIL AND GAS RESOURCES OF THE CASPIAN COUNTRIES

2021 ◽  
Vol 06 (02) ◽  
pp. 23-27
Author(s):  
Gulshan Zeynalova Gulshan Zeynalova
Keyword(s):  
Natural Gas ◽  
Caspian Sea ◽  
Oil And Gas ◽  
Decisive Role ◽  
Oil And Gas Industry ◽  
Energy Information Administration ◽  
Caspian Region ◽  
The Caspian Sea ◽  
Oil Reserves ◽  
Oil And Gas Resources

The Caspian Sea is the largest body of water in Eurasia: After the collapse of the USSR, the water area of this region is a zone of interest for many states. [1] The Caspian region rightfully serves as one of the most significant regions for most countries interested in the mineral resources that the Caspian is rich in. The Caspian Sea has a significant hydrocarbon reserves. According to the Energy Information Administration (EIA), hydrocarbon resources in the Caspian basin have the following values: oil - 48 billion barrels of oil, natural gas - 292 trillion. cubic feet (found and probable reserves), of which 75% and 67%, respectively, are produced or may be produced offshore. The northern part of the Caspian Sea contains most of the oil reserves, while the southern sector of the Caspian Sea is rich in natural gas.[2] It should be emphasized that the list of states that have the rights to use the resources of the Caspian Sea is as follows: Azerbaijan, Iran, Kazakhstan, Russia and Turkmenistan. It is impossible to correlate the importance of the oil and gas resources of the Caspian reservoir for each of the above countries, for the following reasons: Azerbaijan and Turkmenistan are countries for which the hydrocarbon potential of the Caspian is the most important predictor of the formation and development of the economy, while for Kazakhstan, the use of oil and gas resources of the Caspian Sea plays an important , but not the most decisive role, since oil and gas deposits in this country are not limited to the Caspian region, but its economy is developing in other directions. Iran and Russia, however, are interested in influencing the direction of flows of oil and gas raw materials, including their transit through the territory of the countries. [3] The last years for the Caspian region have become the years of a shift in the development of the oil and gas industry of the Caspian "five", which account for 17.6% of oil reserves and 46.4% of gas reserves in terms of global reserves. It is assumed that on the territory of the Caspian shelf, which belongs to Russia, oil reserves amount to 270 million tons, natural gas reserves - 0.5 trillion cubic meters. m of gas. [4] Of course, it is worth noting that the potential of the Russian sector of the Caspian Sea is significantly lower than the oil and gas potential of Yamal or Western Siberia, but the development of this region is important for the strategic development of the oil and gas sector, in particular offshore drilling.

scholarly journals THE CASPIAN REGION IN MODERN POLITICS: PROBLEMS OF REGIONAL COOPERATION

2021 ◽  
Vol 5 (2) ◽  
pp. 211-220
Author(s):  
V.V. Pushkareva
Keyword(s):  
Caspian Sea ◽  
Legal Status ◽  
Oil And Gas ◽  
Regional Cooperation ◽  
The United States ◽  
Caspian Region ◽  
The European Union ◽  
The Caspian Sea ◽  
National Interests ◽  
Reliable Mechanism

The Caspian region appears in international political terms with the USSR collapse. It includes five littoral countries - Azerbaijan, Iran, Kazakhstan, Russia and Turkmenistan, which are building cooperation with each other and with non-regional actors in the new geopolitical conditions. The formation of relations is influenced both by the common and diverse national interests of the Caspian states, and by the constant direct and indirect impact of external players: the United States, the European Union, China and Turkey. Each of them regards the Caspian region as the most important strategic space for political and economic control over Eurasia in accordance with their own interests. The interest of the world powers in strengthening their influence in the Caspian Sea is connected, firstly, with oil and gas reserves, and secondly, with the fact that the region is the center of Eurasia, where a transport transit corridor connecting Europe with various regions of Asia passes. The domestic and foreign political conditions of the Caspian region are not easy. The main problems of regional cooperation are the disunity of the region, the potential for the implementation of "color revolutions" against the background of socio-economic difficulties. The "domino effect" in development of the situation is quite real. There is no reliable mechanism to protect regional interests. The first steps to form multilateral cooperation have been taken on the basis of The Convention on the legal status of the Caspian Sea.

scholarly journals PROSPECTS FOR ENERGY COOPERATION OF THE COUNTRIES OF THE CASPIAN REGION IN THE FIELD OF OIL AND GAS DEVELOPMENT

2021 ◽  
Vol 5 (2(83)) ◽  
pp. 12-19
Author(s):  
E. Gasumov
Keyword(s):  
Caspian Sea ◽  
Energy Transport ◽  
Oil And Gas ◽  
Raw Materials ◽  
Caspian Region ◽  
The Caspian Sea ◽  
Resource Base ◽  
Oil And Gas Development ◽  
Oil And Gas Fields ◽  
Gas Fields

The article discusses the features of the development of oil and gas fields in the Caspian region by the coastal states. The analysis of the participation in various years of large international companies in the development of oil and gas fields in the waters of the Caspian Sea is carried out. The development of the resource base of hydrocarbon raw materials in the countries of the Caspian region associated with the discovery of new geological structures is considered. Aspects of how the countries of the Caspian region have become full-fledged exporters of hydrocarbons are outlined. The main aspects of the great prospects for the development of the Caspian countries and possible steps in bringing to a new stage of cooperation between the states of the region in the energy, transport and communication spheres are stated. It is indicated that the joint development of the shelf hydrocarbons, which are of international and regional importance, serves to strengthen dialogue and cooperation on dividing the bottom of the Caspian Sea.

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.

Chemical Deliquification of Unconventional Gas Wells

2014 ◽  
Author(s):  
K.. Francis-LaCroix ◽  
D.. Seetaram
Keyword(s):  
Natural Gas ◽  
Best Practice ◽  
Oil And Gas ◽  
Large Deviation ◽  
Cost Effective ◽  
Gas Production ◽  
Lessons Learned ◽  
Offshore Platforms ◽  
Gas Wells ◽  
Current Production

Abstract Trinidad and Tobago offshore platforms have been producing oil and natural gas for over a century. Current production of over 1500 Bcf of natural gas per year (Administration, 2013) is due to extensive reserves in oil and gas. More than eighteen of these wells are high-producing wells, producing in excess of 150 MMcf per day. Due to their large production rates, these wells utilize unconventionally large tubulars 5- and 7-in. Furthermore, as is inherent with producing gas, there are many challenges with the production. One major challenge occurs when wells become liquid loaded. As gas wells age, they produce more liquids, namely brine and condensate. Depending on flow conditions, the produced liquids can accumulate and induce a hydrostatic head pressure that is too high to be overcome by the flowing gas rates. Applying surfactants that generate foam can facilitate the unloading of these wells and restore gas production. Although the foaming process is very cost effective, its application to high-producing gas wells in Trinidad has always been problematic for the following reasons: Some of these producers are horizontal wells, or wells with large deviation angles.They were completed without pre-installed capillary strings.They are completed with large tubing diameters (5.75 in., 7 in.). Recognizing that the above three factors posed challenges to successful foam applications, major emphasis and research was directed toward this endeavor to realize the buried revenue, i.e., the recovery of the well's potential to produce natural gas. This research can also lead to the application of learnings from the first success to develop treatment for additional wells, which translates to a revenue boost to the client and the Trinidad economy. Successful treatments can also be used as correlations to establish an industry best practice for the treatment of similarly completed wells. This paper will highlight the successes realized from the treatment of three wells. It will also highlight the anomalies encountered during the treatment process, as well as the lessons learned from this treatment.

Initiatives in UK Offshore Decommissioning Following the Wood Review: Applicability for Decommissioning in Norway

2021 ◽  
Author(s):  
Rune Vikane ◽  
Jon Tømmerås Selvik ◽  
Eirik Bjorheim Abrahamsen
Keyword(s):  
Swot Analysis ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Lessons Learned ◽  
Regulatory Regime ◽  
Regulatory Body ◽  
Cost Estimates ◽  
Substantial Impact ◽  
Gas Recovery ◽  
The Uk

Abstract The 2014 Wood Review is a report reviewing UK offshore oil and gas recovery and its regulation, led by Sir Ian Wood. The report identifies and addresses key challenges in the UK petroleum industry, among them the lack of a strong regulatory body and a decommissioning strategy. The UK petroleum industry is mature, and Norway may benefit from UK's experiences in decommissioning. The article investigates the applicability of the Wood Review recommendations for decommissioning in Norway. The analysis of the recommendations in the Wood Review is carried out by a SWOT-analysis of the general recommendations with a high potential impact on decommissioning as well as the five recommendations specific to decommissioning. The recommendations in the Wood Review were broadly accepted by UK authorities and formed the basis for numerous initiatives aimed at improving policies and practices in UK decommissioning. The key initiatives are presented to illustrate how the Wood Review recommendations has been interpreted. A summary of the key differences between the petroleum industries and the regulatory authorities in Norway and the UK is provided for background. Decommissioning in Norway face similar challenges to those identified in the Wood Review. The analysis indicates that several of the UK initiatives following the recommendations in the Wood Review has the potential of improving decommissioning in Norway. Differences in regulatory regimes between the regions may complicate the implementation of some of the initiatives following the Wood Review in Norway. In most cases only minor changes to regulations and/or practices are required. Recent UK initiatives with a high impact on decommissioning include increased focus on sharing of information and lessons learned, increased collaboration, the development of a decommissioning strategy, benchmarking of decommissioning cost estimates for all projects and the development and publishing of annual UK decommissioning cost estimates. There are indications that the Norwegian Petroleum Directorate (NPD) and the Norwegian Ministry of Petroleum and Energy (MPE) are falling behind their UK counterparts in key areas. Norway has limited experience with decommissioning, and scrupulous analysis of lessons learned in other regions is essential. Decommissioning of Norwegian offshore infrastructure is a major undertaking and even minor improvements may have a substantial impact on personnel risk, risk to the environment or the total decommissioning expenditure. The Norwegian regulatory regime has been an integral part of the Norwegian petroleum industry's success in previous decades, and changes to the regime require careful deliberation. The recent implementation of initiatives aimed at improving decommissioning regulations and practices in the UK represents a unique learning opportunity for Norwegian authorities. The analysis suggest that Norway may benefit from adopting some of the UK initiatives following the Wood Review recommendations.

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