In a deviated well in Caspian Sea gas oil ratio (GOR) increased rapidly in 2017. The result was an oil rate decline with several choke backs to manage GOR build-up. After performing two production-logging jobs, it was confirm that 76% of the gas production was coming from four upper perforations. The main objective was to perform a Gas Shut off (GSO) treatment in two stages to reduce gas production by squeezing polymer into the formation and setting packers at 59° deviation inside 9-5/8 in. casing for temporarily isolation of middle and lower production sands. Fifteen runs were perform with a tube wire-enabled CT telemetry (CTT) system which consists of a customized bottomhole assembly (BHA) that instantaneously transmits differential pressure, temperature, depth data to surface through a non-intrusive tube wire installed inside the CT. For the first time in the region, a tension, compression and torque (TCT) sub-assembly was deploy to control the entire set/retrieve process with accurate downhole upward/downward forces. CTT technology was a key element to successfully set two Thru Tubing Inflatable Retrievable Packers (TTIRP) by doing casing collar locator (CCL) correlations at tubing end which was 133 m and 228 m (MD) shallower from setting depths. In addition, during second GSO operation, polymer crosslink time was modify based on actual bottomhole temperature recorded with CTT system. Finally, during third GSO treatment placement was improve spotting more GSO system in casing section avoiding further treatments. After successful placement of the GSO system, a drop from 15.5 to 4.5 MMscf/day in gas production was observed along with GOR reduction from 11,000 to 750 MMscf/bbl and oil rate increment from 1.4 to 6.04 Mbpd. Furthermore, after gas reduction operator was able to produce between 1.5 to 2.0 Mbpd from other wells that were choke back based on gas handling capabilities limitations The novelty of using the CTT system and TCT sub-assembly for real-time monitoring of BHA data was proven for not only positioning two TTIRP, modifying polymers crosslink design, placing polymer precisely across target intervals and retrieve two TTIRP that at the end provide direct and positive financial impact for the operator.

Summary In a deviated well in the Caspian Sea, the gas/oil ratio (GOR) increased rapidly in 2017. The result was an oil rate decline with several choke backs to manage GOR buildup. After performing two production-logging jobs, it was confirmed that 76% of the gas production was coming from four upper perforations. The main objective was to perform a gas shutoff (GSO) treatment in two stages to reduce gas production by squeezing polymer into the formation and setting packers at a 59° deviation inside a 9⅝-in. casing for temporary isolation of the middle and lower production sands. Fifteen runs were performed with a tube wire-enabled coiled tubing (CT) telemetry (CTT) system that consists of a customized bottomhole assembly (BHA) that instantaneously transmits differential pressure (DP), temperature, and depth data to the surface through a nonintrusive tube wire installed inside the CT. For the first time in the region, a tension, compression, and torque (TCT) subassembly was deployed to control the entire setting/retrieval process with accurate downhole upward/downward forces. CTT technology was a key element to successfully set two through-tubing inflatable retrievable packers (TTIRPs) by performing casing collar locator correlations at the tubing end, which was 133 and 228 m [measured depth (MD)] shallower from the setting depths. In addition, during the second GSO operation, the GSO gel system crosslink time was modified on the basis of the actual bottomhole temperature (BHT) recorded with the CTT system. Finally, during the third GSO operation, treatment placement was improved, spotting more GSO gel system inside the casing section and avoiding further treatments. After successful placement of the GSO gel system, a drop from 15.5 to 4.5 MMscf/D in gas production was observed (GOR reduction from 11,000 to 750 MMscf/bbl) with an oil rate increment from 1.4 to 6.04 Mbbl/D. Furthermore, after the gas reduction, the operator was able to produce between 1.5 and 2.0 Mbbl/D from other wells that were choked back on the basis of gas handling capabilities limitations. In the short term, GOR reduction sustained at 3,000 MMscf/bbl and 3.0 Mbb/D oil rate. The novelty of using the CTT system and TCT subassembly for real-time monitoring of BHA data proved to be beneficial for positioning two TTIRP, modifying GSO gel system design, placing it precisely across target intervals, and retrieving two TTIRPs that in the end provided direct and positive financial impact for the operator.

The article is devoted to the analysis and interpretation of the VSP data (vertical seismic profiling) obtained in two wells of the Hovsan field. It gives information about the history of the study, the geological and geophysical characteristics of the field and the seismic surveys by the VSP method conducted here in 2010 and 2014 in the wells of 1856 and 1867, respectively. The main parameters of the VSP wells are briefly described and the quality of the seismic material is characterized. Analysis of the velocity obtained from the VSP and Sonic Log acquired in investigated wells shows that after a significant increase in the values of the interval velocities to 4500-4700 m / s at depths of 3600-3800 m, a sharp decrease is observed in their values to ~ 2000 m / s at depths of ~ 5150 m, which corresponds to the speed at a depth of 1000 m. This is confirmed by the seismic inversion of the VSP data. The interval of a sharp decrease in the velocities of seismic waves corresponds to the deposits of the Miocene. This clearly indicates the presence of abnormally high pore pressure in this oilfield, associated with fluid accumulations, which is of great practical interest.

The paper is devoted to more accurate design of velocity model of geological section on the basis of Parametric Deconvolution of Reflections (PRO) technique. CDP technique applied widely does not solve too many problems without resolution of which the petroleum industry in the country will definitely be behind the leading petroleum industries worldwide. The reason of such low economic indexes of geological survey consists in no improvement of resolution ability of CDP technique in Azerbaijan for over 30 years. One of the most complex and important tasks of seismic survey in areas with complicated setting in Azerbaijan consists in evaluation of velocity characteristics of geological environment which is crucial for development of adequate geological model. The paper gives the examples of practical use of PRO method applied to real seismic data from the worldwide practice. Results of PRO velocities calibration with the average velocities of vertical seismic profiling has been shown: the curves almost coincide. It has been noted that detailed development of velocity model by use of PRO allows to successfully resolve kinematic, as well as dynamic problem: velocity anomalies (low interval velocities) are stipulated by gas deposit presence. Results of PRO application in one of the areas of Absheron oil and gas region are displayed. Study of PRO velocities allowed to outline low velocity areas related to overpressure zones and possible presence of oil and gas reservoirs. Recently drilled well recovered oil and gas horizon in Miocene deposits.

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