Method for quantitative determination of rock samples water-saturation using values of initial and final water-saturation

FIELD: mining.

SUBSTANCE: there performed is a core sample preparation, modelling of core sample reservoir conditions, joint filtering of salt water and oil through core sample, measurement of intermediate intensiveness of X-rays passed through the sample during filtering and determination of water-saturation by expressions. Note that the intensity of X-rays passing the sample with initial and final water-saturation is measured, the reference signal is obtained. The value of residual water-saturation is obtained after filtering experiment of water evaporation from the sample at 110-160°C. The values of initial, residual water-saturation and reference signal are used for determination of intermediate water-saturation via certain mathematical relation.

EFFECT: reduction of time for core water-saturation measurement, increase of water-saturation values determination accuracy.

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The invention relates to the field of petrochemical industry and can be used in commercial and research laboratories for the development of technologies to increase oil recovery in the calculation of oil reserves, operational control over the development of oil fields.

The proposed method is applicable in experiments to determine the dependence of the coefficients relative permeabilities of water and oil from water saturation in the conditions close to the reservoir (OST 39-235-89). The coefficients relative permeabilities are used when developing projects, the exploitation of oil fields.

There is a method of determining the water saturation of the core is implemented through collaborative filtering, saline water and oil through the core sample and measuring the process of filtering the intermediate-intensity x-ray radiation passed through the sample, measuring the intensity of x-rays at 100%saturation with water, measuring the intensity of x-ray radiation passed through the dry sample and determining the water saturation in dependence (Skripkin A.G., Sallinen Y.A. Patent No. 2315978 Method of determining the water saturation of the core. Priority of invention 14 September 2006). This method requires additional maintenance is the relationship of the mass absorption coefficients of x-rays in the oil and saline water, in addition, in this method it is necessary to perform an additional scan of dry saturated with saline water on a 100% sample, which significantly increases the time of measurement.

There is a method of determining the water saturation using polychromatic x-ray system with control saturation of reservoir rocks liquids by absorption of x-rays (A.M. Kuznetsov Scientific-methodological framework and research on the impact properties of reservoir rocks on the efficiency of hydrocarbon recovery from the subsurface, the dissertation on competition of a scientific degree of the doctor of technical Sciences, M., 1998), taken as a prototype. Data about the intensity of x-rays are collected by moving the x-ray tube, collimator and detector unit cell along the horizontal axis of the sample from the input section to the output. Simulate reservoir conditions. The saturation of reservoir rocks of the core is calculated on the basis of the law of Lambert, using the linearity of the semi-logarithmic dependence of x-ray radiation, measured at 100% saturation of the sample labeled liquid and 100% saturation is not labeled liquid on a mathematical formula to measure what interim (current) the intensity of x-ray radiation passed through the sample; the intensity of the rent is Nevskogo radiation at 100%saturation oil; the intensity of x-rays at 100%saturation with water. This can be labeled as the water phase (as the label using sodium iodide), and oil (label - iodooctane). This method is methodologically difficult, time-consuming to conduct the procedure of saturation of the sample sequentially labeled and unlabeled liquids at 100% for calibration. In addition, comparative analysis with filtering labeled water, shows that adding labels (sodium iodide, potassium iodide, etc. can lead to significant (up to 10%) the change in the permeability of the samples on the water. This phenomenon is due to the change in the wettability of the surface of the rock sample when exposed to a labeled water. Also some iodine-containing organic substances (iodooctane, octyl iodide) partially soluble in water.

Another disadvantage of this method is that for different models of x-ray machines actually set values of voltage and current of the x-ray tube differs from the target by an amount determined by resolution of the digitized signal (quantum noise). In this regard, the sequential scanning of the water - saturated samples of rocks several times, the average value of the signal detector, ceteris paribus, changes. Thus, the ri determining the saturation of the core by using multiple scans of the samples you receive the systematic error.

Tasked to develop a rapid and informative method for determination of water and oil saturation of the rock core in the conditions close to the reservoir (elevated pressure and temperature).

The technical result of the method consists in reducing the time for measuring the water saturation of the rock core, and increasing the accuracy of determining the values of water saturation.

The technical result is achieved by the fact that in the known method of determining the water saturation of the core, including the preparation of the core sample, simulation of reservoir conditions in the core sample, collaborative filtering saline water and oil through the core sample in different ratios, the dimension in the process of filtering the intermediate-intensity x-ray radiation passed through the sample and the establishment of a mathematical formula water saturation, it is new that before measurement, the sample core set the initial water saturation, produce scanning of a rock sample with initial water saturation, and used when measuring low values of voltage and current of the x-ray tube, receives the reference signal by scanning the metal plate behind the rock samples, to filter the used oil with the addition of the of iodobenzene (C6H5I), (the value of the residual water saturation obtained after filtration experiment by evaporation of water) from the sample at a temperature of 110-160º produce scanning of a rock sample with a finite saturation, then the initial value, the final water saturation and the reference signal are used to determine an intermediate water saturation on mathematical dependencies:

where SNR- is the initial water saturation of the sample, deg;

SVK- the final water saturation of the sample, deg;

INR,signal of the detector during the scanning of x-ray radiation of the core sample with initial water saturation and the reference signal;

IVK,signal of the detector during the scanning of x-ray radiation of the core sample with a finite saturation and the reference signal;

I, Ionsignal of the detector during the scanning of x-ray radiation of the core sample with intermediate saturation and the reference signal;

The saturation of the sample is determined from the condition of occupancy of the pore space:

The initial water saturation is set before filtration experiment with an accuracy of about 1%, for the EP, methods on semi-permeable membrane, centrifugation, or by displacement of water by oil. Target saturation is determined after filtration of the experiment when the evaporation of water from the sample with an accuracy of about 2%. Using calculations known and defined with great precision values of the initial and final Bodenseehotel allows to increase the accuracy of determining the values of water saturation.

Using the reference signal allows to reduce systematic measurement error, which increases the accuracy of determining the values of water saturation.

Disclaimer scan saturated at 100% mineralized water sample allows to reduce the time of measurement of water saturation.

Use low values of voltage and current of the x-ray tube can significantly increase the service life of x-ray equipment. Soluble in oil and insoluble in water iodobenzene (C6H5I) is used to increase the absorption of x-rays in its mixture with oil. This increases the contrast of the signal when scanning vodoneftyanykh samples of rocks, which in turn improves the accuracy of determination of saturation.

The proposed method is applicable in experiments to determine the dependence of the coefficients relative photovoltaically water and oil from water saturation in the conditions close to the reservoir (OST 39-235-89).

The figure shows a graphical dependence comparison Bodenseehotel defined by the resistance and x-ray method.

Before conducting the experiment for determining the permeability of water and oil for cylindrical rock sample (cemented Sandstone) with a diameter of 30 mm and length of 40 mm to 70 mm determine pore volume (OST 39-181-85). The sample core is extracted and dried in a heating Cabinet at a temperature of 100-110 º C to constant weight. The sample is saturated under vacuum reservoir with water or a model of the reservoir water and placed in capillaries. Create and measure the initial water saturation. The part then that is not occupied by the water fill model of oil. For this purpose, the sample is placed in kerosene, aged 23-25 hours, the sample was then placed in Viton lip seal inside of radiolucent kindergaten. Served in a sample of the oil with the addition of iodobenzene and increase the pressure in the sample to the first, with the space between the wall of kindergaten and the cuff serves mineral oil, creating pressure crimping of the sample. Pressure crimping increase to a value of 3-5 MPa excess pore pressure. Spend warming up of kindergaten sample to the reservoir temperature. On the wall of kindergaten for the core sample fix the metal (copper) plate with a thickness of 2-3 mm thickness of the plates is selected so that so when probed by x-ray radiation of a rock sample and inserts the value of the signal registered by the detector was the same. The next step is filtered through a sample model of oil with the addition of iodobenzene about 5 pore volumes. Include an x-ray machine and produce a scan of a rock sample with initial water saturation, and the metal plate - Shine kindergaten collimated beam of x-rays, using the detector to measure the intensity of the past radiation, the carriage with the x-ray machine and detector move along the core sample and the metal plate with a pitch of 0.8 mm, at each step, conduct a measurement of the radiation intensity. Carry out the averaging of the signal detector separately for scanning site of the rock sample and the metal plate. The averaged signal is conducted to obtain the average volume of the sample saturation. The voltage on the x-ray tube - 65-75 kV, current - 180-195 µa. When the scan tube current are selected so that the signal from the detector was not less than 4/5 of the upper limit of the measuring detector, the selected value of voltage and current does not change during the whole experiment.

Conduct collaborative filtering saline water and oil in the ratio 25:75, 50:50, 75:25 and 100% of the odes. Whenever the ratio of scans of the sample, measure the average value of the signal detector I.

The sample is removed from kindergaten and placed into a chamber of the extractor (office of the legislative Assembly). At a temperature of 110-160º within 6 hours of sample water is evaporated. Target saturation is determined by the amount of condensed water in the test tube.

The obtained values of the initial and final water saturation SNRand SVKand also the average values of the signal from the detector when scanning the core sample with initial, final and intermediate saturation substituted in the formula

Determine the saturation of the core sample in conditions of high pressure and temperature for each mode of collaborative filtering water and oil.

The comparison of experimental data for samples from different fields in Western Siberia is shown in the figure. On the x-axis is the saturation obtained by the method of resistance, and on the y - axis of the x-ray method. The graph also built linear dependence with a single slope that goes from the origin.

1. The method of quantitative determination of saturation of samples of rocks using the values of initial and final water saturation, including sample preparation is of NRN, modeling of reservoir conditions in the core sample, collaborative filtering saline water and oil through the core sample, the dimension in the process of filtering the intermediate-intensity x-ray radiation passed through the sample and the establishment of a mathematical formula water saturation, characterized in that measure the intensity of x-ray radiation passed through the sample with the initial and final water saturation receive the reference signal, the value of the residual water saturation obtained after filtration experiment by evaporation of water from the sample at a temperature of 110-160°C, initial value, residual water saturation and the reference signal are used to determine an intermediate water saturation on mathematical dependencies:

where SBH- is the initial water saturation of the sample, dad;
SBK- the value of the final water saturation of the sample, dad;
INR,signal of the detector during the scanning of x-ray radiation of the core sample with initial water saturation and the reference signal;
IVK,signal of the detector during the scanning of x-ray radiation of the core sample with a finite saturation and the reference signal;
I, Ion

2. The method according to claim 1, characterized in that the filtering used oil with the addition of iodobenzene.

3. The method according to claim 1, characterized in that when the measurements are lower values of voltage and current of the x-ray tube.



 

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