The effect of acidic compounds in the elastic-strength properties of clastic reservoir rocks of Perm Region
Key words: core, matrix acidizing, elastic-strength properties, hydraulics fracture
Authors: V.V. Plotnikov, P.N. Rehachev, N.N. Barkovskij, D.V. Beloglazov (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm), N.N. Mikhailov (Gubkin Russian State University of Oil and Gas, RF, Moscow), S.N. Popov (Oil and Gas Research Institute of RAS, RF, Moscow)
One of the most common and effective method ща production stimulation is hydraulic fracturing preceded by acid treatment of bottom-hole zone. It is known that in acidizing a rock multiphase chemical reactions occur - dissolution of the carbonate component, dissolution of silicate minerals, the particle-colmatant, adscititious during drilling, jamming, operation of wells, as well as various kinds of precipitation and re-precipitation of their dissolution. The resulting acid composition alters the internal structure of the space capacitance, which in turn leads to a change in filtration and the elastic-strength characteristics of all the treated portion of the formation. In this paper we present the features of a laboratory studying the effects of acidic formulations filtration and elastic-strength characteristics of clastic reservoir rocks. The developed method authors complex laboratory research, including the study of the interaction of acidic compositions with rock and fluid in the void volume and the filtration test core samples under simulated reservoir conditions. According to the developed technique the authors conducted a series of laboratory experiments on the effects of the mud acid terrigenous rocks reservoir of one of the deposits of the Perm region. Some results of the acid composition tests and considered the impact of elastic-strength properties of clastic rocks are the main conclusions.
1. Mikhaylov N.N., Izmenenie fizicheskikh svoystv gornykh porod v
okoloskvazhinnykh zonakh (Changing the physical properties of rocks in boreholes
zones), Moscow: Nedra Publ., 1987, 152 p.
2. Mikhaylov N.N., Popov S.N., Variation of permeability, porosity and physical
and mechanical properties of reservoirs under mechanical and chemical impact
(In Russ.), Vestnik TsKR Rosnedra, 2015, no. 3, pp. 17–29.
3. Popov S.N., Influence of mechanical-chemical effects on porosity, permeability
and physical-mechanical properties of reservoirs (In Russ.), Geologiya,
geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2015, no. 8,
4. Magadova L.A., Davletov Z.R., Pakhomov M.D. et al., Podbor optimal'noy
kislotnoy kompozitsii dlya provedeniya uspeshnoy obrabotki prizaboynoy
zony zaglinizirovannogo terrigennogo kollektora na osnove svedeniy o mineralogicheskom
sostave (Selection of the optimal acid composition for a successful
treatment of bottomhole zone of clogged terrigenous reservoirs on
the basis of information on the mineralogical composition), Moscow: Publ. of
Gubkin Russian State Oil and Gas University, 2012, 51 p.
5. Khismetov T.V., Bernshteyn A.M., Kriman E.I. et al., Research of influence of
kill fluids and acid solutions on muddy terrigenous reservoirs (In Russ.), Neftyanoe
khozyaystvo = Oil Industry, 2007, no. 3, pp. 92-94.
6. Al'-Kharti S., Bastos O.A., Semyuel M., Possibilities of high-temperature wells
stimulation (In Russ.), Neftegazovoe obozrenie, 2008-2009, V. 20, no. 4,
7. Aggour M.A., Al-Muhareb M., Abu-Khamsin S.A., Al-Majed A.A., Improving
sandstone matrix stimulation of oil wells by gas preconditioning, Petroleum
science and technology, 2002, V. 20(3&4), pp. 425-434.
8. MR-P ISM-069-OLFI-2014, Metodika opredeleniya karbonatnosti s
razdel'nym soderzhaniem kal'tsita i dolomita manometricheskim metodom
(Methods of determining the carbonate content with separate calcite and
dolomite content using manometric method), Perm': Publ. of PermNIPIneft',
2014, 59 p.
9. MR-ISM-03-OFP-017-2009, Obraztsy gornykh porod. Opredelenie koeffitsienta
pronitsaemosti po zhidkosti (Samples of rocks. Determination of fluid
permeability), Perm': Publ. of PermNIPIneft', 2009, 12 p.
To buy the complete text of article (a format - PDF) or to read the material which is in open access
only the authorized visitors of the website can.