«Onshore and offshore oil and gas well construction»

Technology and material for limiting gas inflow when completing and repairing wells

UDC: 622.276
DOI: 10.33285/0130-3872-2023-12(372)-27-31

Authors:

¹ Ufa Scientific and Technical Center, Ufa, Russia
² Ufa State Petroleum Technical University, Ufa, Russia

Keywords: wells underground repairing (WUR), high gas factor, gas control, gas blocking composition, inter-casing pressure (ICP)

Annotation:

Safety during development and underground repair of wells (URW) at development sites with a high gas factor in the complex geological structure of oil and gas fields requires constant improvement of the technology applied to isolate and monitor gas inflows as well as to monitor inter-casing pressure (ICP). Currently, field practice has effective technical solutions that ensure isolation of gas breakthrough into wells. The methods based on the creation of an extended radial insulating screen in the formation are of particular interest. However, such methods are very labor-intensive and expensive or achieve no satisfactory efficiency. The work limiting gas inflow into gas-polluted wells of the Lyantorskoye oil and gas field demonstrated [1] positive results in 45% of wells. To substantiate an alternative technical solution, filtration studies were carried out by using a highly permeable model (disintegrated core) to block gas breakthrough by means of a gas-blocking composition (GasBC). On the examples of reagents various combinations, a synergistic mixture for gas blocking technology was found. The optimal technology for preventing gas intrusions is to use the synergistic effect of two well-known solutions, namely, pushing the gas front away from the well by a screen of solution and forming a filtration gas-insulating screen of foam. A foam screen is generated directly in the reservoir during reservoir gas migration through a porous medium impregnated by with GasBC. Field testing of the technology at 21 production wells of "Kharampurneftegaz" LLC made it possible to optimize the dosages of reagents, confirm the effectiveness of the chosen solution and achieve control of gas influxes during wells underground repairing (WUR) under conditions of a high gas factor and abnormally low reservoir pressure (ALRP). For a number of geological parameters and wells geometry, eight standard technological plans and a matrix for selecting well killing materials have been compiled. The results of the pilot project are recorded in the engineering report and are considered successful.

Bibliography:

1. Telkov A.P., Krasnov I.I. Vliyanie radiusa ekrana na predel'nyy bezgazovyy i bezvodnyy debity neftyanykh skvazhin Lyantorskogo gazoneftyanogo mestorozhdeniya // Effektivnost' vskrytiya i metodov otsenki slozhnopostroennykh produktivnykh plastov pri burenii i oprobovanii glubokikh razvedochnykh skvazhin: tez. doklada seminara. – Tyumen': ZapSibBurNIPI, 1990. – S. 163–169.
2. Krasnova E.I., Grachev S.I., Marakov D.A. Issledovanie mnogokomponentnykh sistem metodom differentsial'noy kondensatsii plastovogo gaza // Akad. zhurn. Zapadnoy Sibiri. – 2013. – T. 9, № 5(48). – S. 103–104.
3. Povyshenie komponentootdachi v usloviyakh razrabotki neftegazokondensatnykh mestorozhdeniy / I.I. Krasnov, L.V. Samuylova, E.I. Krasnova, E.S. Laputina // Akad. zhurn. Zapadnoy Sibiri. – 2013. – T. 9, № 3(46). – S. 109–110.
4. Krasnova E.I. Otsenka vliyaniya nefti na kondensatootdachu v usloviyakh razrabotki neftegazokondensatnykh zalezhey // Izv. vuzov. Neft' i gaz. – 2013. – № 1(97). – S. 57–60.
5. Primenenie IK-spektroskopii v blizhney oblasti dlya opredeleniya soderzhaniya nefti v gazokondensate / L.A. Tomskaya, V.D. Ryabov, P.A. Vasilenko [i dr.] // Tekhnologii nefti i gaza. – 2008. – № 5(58). – S. 53–60.
6. Analiz faktorov, vliyayushchikh na effektivnost' metodov OPZ porod-kollektorov tyumenskoy svity yurskikh otlozheniy / I.B. Dubkov, I.I. Krasnov, S.V. Minakov, K.V. Yaroslavtsev // Burenie i neft'. – 2008. – № 3. – S. 17–19.
7. Otsenka prichin, oslozhnyayushchikh razrabotku Komsomol'skogo gazokondensatnogo mestorozhdeniya / E.I. Krasnova, L.V. Samuylova, I.I. Krasnov, O.P. Zotova // Akad. zhurn. Zapadnoy Sibiri. – 2013. – T. 9, № 3(46). – S. 110–111.
8. Krasnova E.I., Marakov D.A. Otsenka vozdeystviya na plast uglevodorodnymi rastvoritelyami dlya uvelicheniya komponentootdachi // Akad. zhurn. Zapadnoy Sibiri. – 2013. – T. 9, № 5(48). – S. 103.
9. Izuchenie zavisimosti kondensatootdachi ot soderzhaniya kondensata v plastovom gaze / E.V. Vaganov, E.I. Krasnova, I.I. Krasnov [i dr.] // Akad. zhurn. Zapadnoy Sibiri. – 2014. – T. 10, № 1(50). – S. 118.
10. Features of Killing Wells Operating Fractured Formations with Abnormally Low Formation Pressures and High Gas Factor / V.A. Shaydullin, S.A. Vakhrushev, N.R. Magzumov [et al.] // SPE Russian Petroleum Technology Conf., Oct. 26–29, 2020, Virtual. – DOI: 10.2118/202071-MS
11. Ponomarenko M.N., Abdreev K.B., Efimov O.D. Opyt primeneniya tekhnologiy i reagentov po glusheniyu skvazhin na mestorozhdeniyakh PAO "Gazprom" // Neft'. Gaz. Novatsii. – 2020. – № 7(236). – S. 76–79.
12. Tekhnologii glusheniya skvazhin v usloviyakh mnozhestvennykh oslozhneniy / V.N. Gusakov, A.Yu. Korolev, R.A. Yagudin [i dr.] // Neftegazovoe delo. – 2023. – T. 21, № 2. – S. 17–24. – DOI: 10.17122/ngdelo-2023-2-17-24