Method for determination of working intervals and sources of flooding in horizontal oil well

FIELD: oil and gas industry.

SUBSTANCE: method includes delivery of a shank with a set of packers and unions, downhole geophysical multi-purpose device to the hole end at a logging cable. Pumping into the well of a fluid containing thermal- and neutron-contrasting agents and periodical measurements. Contrasting fluid is pumped by several portions with volumes not less than interior volume of the horizontal borehole by means of subsequent switching into operation of different boreholes intervals covered by packers, by means of opening and closure control of outlet connections. Oil is used as a contrasting fluid instead of water. Movement of the contrasting fluid through the borehole is monitored by gamma-ray modules, resistivity meter or thermoconductive flowmeter.

EFFECT: improving accuracy for determination of operating intervals and sources of flooding under conditions of horizontal wells operation.

5 cl, 6 dwg

 

The invention relates to the technology of oil production, and in particular to methods implementation, interpretation and analysis of results of geophysical studies in the horizontal (HS).

Known technologies of geophysical research including shipping in the wellbore deep geophysical instrument and subsequent registration of temperature and pressure (for example, applications on the inventions of the Russian Federation No. 2004100732, 08.01.2004 or No. 2005127125, 29.08.2005).

In the case studies GS these methods it is impossible to estimate the distribution profile along the barrel spending phase parameters and to identify the location of the preferential flow of water in the trunk, due to the fact that the well has a sinusoidal trajectory components of this product are well stratified in the barrel under the action of gravity and the wellbore is filled unevenly depending on the angle. Therefore, in the study of HS in these ways there is a mismatch between the true and expenditure inflow that, in turn, does not allow effective repair work in the well.

A known method of monitoring the productivity uglevodosoderjati intervals (as the USSR №1805213, 27.01.1989), in which the well is pumped liquid containing thermocontractable and nationalstrategies substances through the Yu which thermal and neutron anomalies along the wellbore judge watering and productivity of the reservoir.

However, the effectiveness of this method in the horizontal well is low. This is due, firstly, to the inability to provide uniform absorption of the injected fluid due to the large length of the barrel, and, secondly, the complexity in determining the interval of time when the liquid reaches the studied interval.

This disadvantage can be eliminated using dual and sequential operation and development of multiple layers of one well (patent RF №2350742, 21.05.2007). This method is closest to the proposed and include shipping in the end of the bore of the shank with a set of packers and access fittings between them, which facilitates the alignment of the flow profile (absorption). However, the quality of alignment is not always satisfactory because of the impossibility of the direct distance (in the process of conducting work on the well) flow control and lack of operational control of the distribution of inflowing (absorbed fluid) along the length of the shank.

The objective of the invention is to improve the accuracy of determining the running intervals and sources of irrigation in the operating conditions of the TOS.

To solve this problem we propose a method that includes the delivery end of the bore of the shank with the set, packers and fittings, CH is Binney geophysical integrated device on the cable, injection into the well fluid containing thermocontractable and nationalstrategies substances, and periodic measurements on modes: injection, extraction wells and stop the injection of a contrast fluid is produced in several portions, the volume of which is not less than the internal volume of the horizontal part of the stem, which is provided by rotating the work covered by packers intervals of the reservoir, managed by opening and closing the access fittings.

The proposed method has the following additional features.

1) as a contrast fluid instead of water, used oil, which gives the opportunity to retain the original properties of the oil reservoir and to provide a more pronounced effect selection flooded intervals.

2) for subsequent interpretation of the account of movement of contrast fluid in the wellbore during pumping track with modules, gamma-ray, resistivity meter or thermoconductive flow meter.

3) Potential watering intervals and the intensity of the absorption layer appreciate using modules gamma logging, thermometer and pulse (or stationary) neutron logging;

4) For measurements at injection, stop or stimulation instead of a logging tool on the cable used, the distribution is config fiber optic sensor thermal field.

In the present illustration shows a scheme of work on methods, selected as analogues and the proposed method.

Figure 1 illustrates the case when the horizontal shaft, which is the injection of a contrast fluid, there is no special equipment.

Marked: 1 - pump-compressor pipes, 2 - pump, 3 - borehole, in which omitted the shank with filter, 4 - layer, I - distribution of the test geophysical parameter along the length of the barrel, showing that the contrast liquid is distributed over the trunk and enters the reservoir unevenly.

Figure 2 corresponds to the case when at the end of the wellbore delivered shank with a set of packers and fittings.

Marked: 1 - pump-compressor pipes, 2 - pump, 3 - borehole, in which omitted the shank with filter, 4 - layer, 5 - packers separating the wellbore section, 6', 6", 6"' - fittings (mandrel) respectively of the first, second and third sections, located at the technological mode of the bore in the open position, 7 - distribution of the test geophysical parameter along the length of the horizontal wellbore.

Preliminary adjustment of the opening of the fittings achieve more uniform distribution of contrast fluid along the length of the barrel. However, the quality of alignment neurolemma is sustained fashion because of the impossibility of direct remote flow control and lack of operational control distribution of fluid along the length of the shank.

The degree of alignment depends on the settings of Mandela. Since operational control distribution of fluid along the length of the shank is missing, the alignment of the flow is poor, as illustrated by the uneven layers the distribution of the test geophysical parameter (7 in figure 2).

Figure 3 illustrates the implementation of the proposed method.

Marked: 1 - pump-compressor pipes, 2 - pump, 3 - borehole, in which omitted the shank with filter, 4 - layer, 5 - packers divide the wellbore into sections, 6', 6"' - mandrel the first and third sections being at the technological regime of the well in the closed position, 6 - mandrel the second (middle) section 7 - system logging tools on the cable, 8-16 - the distribution of the test geophysical parameters along the length of the barrel.

In this case, to work alternately connect the different parts of the reservoir. The state of Mandela quickly adjust from the surface according to the results of geophysical measurements.

In this example, the trunk is divided into three sections. Mandrel the first and third sections (6',6"', 3) are closed. Mandrel the second (middle) section (6" in figure 3) are open. It is through them that is the message of the reservoir and the wellbore. Remote control motion kontrastnoi fluid carried out with the aid of the rd system geophysical instruments on the cable, placed under the pump intake (7, figure 3).

Thus, by adjusting the movement of contrast fluid, provide the necessary quality of its alignment.

As a contrast fluid used oil that improves the accuracy of control of the movement of contrast fluid using geophysical instruments. The control accuracy is increased also due to the fact that each dimension has only one of Mandela, but not all three at the same time.

The movement of oil injection is monitored using the methods of gamma logging (to bind to the incision), resistivity meter or thermoconductive flow meter.

Inclusion in the complex of methods of geophysical research gamma ray is connected with the necessity of a detailed reference to the section of the horizontal part of the trunk (curve 8 in figure 3).

Inclusion in the complex of geophysical research resistivity meter is connected with the necessity to control the range of motion of a contrast fluid into the barrel. Control is possible because of the extremely low conductivity of oil compared to other fillers wellbore and formation fluids (curve 9 in figure 3).

Inclusion in the complex of geophysical research thermo-anemometer is connected with the necessity to control the interval of receipt of a contrast fluid into the reservoir (curve 10 figure 3).

Potential intervals Obvodny and the absorption intensity of a contrast fluid into the reservoir is estimated at stopped well by using modules gamma logging (to bind to the incision), thermometer and pulse (or stationary) neutron logging.

Inclusion in the complex of geophysical research, thermometer and neutron logging associated with the need to control the working thickness of the reservoir, absorbing the contrast fluid (curves 11-15 and 16 figure 3).

Standard technology thermal studies provides a series of discrete measurements that differ by the time elapsed after the stop of the wells and mode of operation of the well. In the example of the practical implementation of the method this background thermogram (11), thermogram in the injection process (12), idle after injection hole (13), in the selection process (14) and after cessation of selection (15).

The effectiveness of this method thermal studies in the conditions of application of the proposed method is low due to the weak differences between the images due to the short duration of injection (selection). Therefore, for this purpose use a distributed fibre optic sensor. The advantage of this sensor is that the temperature can be measured almost continuously, i.e. with the maximum reliability.

As a result, by providing a more uniform operation of the trunk and control flow (absorption) increases the accuracy of determining the running intervals and sources of irrigation in the operating conditions of the TOS.

Techniciansmainly research in the horizontal section and control sections of the proposed method is confirmed by the work methods, selected as analogs and prototypes.

The effectiveness of clipping aquifer intervals detected by alternately connect to the various parts of the layers, separated by partitions, is confirmed by the results of digital simulation.

Figure 4 shows the geometric features of the model. In the illustration: 1 - barrel simulated operating horizontal wells, 2 - distribution of reservoirs in the opened well layer (color intensity characterizes the value of the coefficient of porosity), I, II, III - intervals alternate dual injection, equipped according to the claimed method.

Figure 5 illustrates the effect of clipping aquifer interval at the base of the Deposit. In this figure: 1 and 2, respectively, the flow rate of the liquid and oil in the standard way of operating the wells, 1* and 2* are the same when trimming intervals diagnosed as aquifers. It is seen that in the latter case, the well productivity falls in time less sharply increases, the amount of oil produced and decreases the flow rate of the liquid.

This decreases the water content of the products. This fact illustrates 6, where 1 and 1* watering before and after intervals of the water.

1. The method of determining the running intervals and sources of irrigation in horizontal wells on the committed delivery end of the bore of the shank with a set of packers and fittings, deep geophysical integrated device on the cable, the injection into the well fluid containing thermocontractable and nationalstrategies substances, and periodic measurements on modes: injection, extraction wells and stop, characterized in that the injection of a contrast fluid is produced in several portions, the volume of which is not less than the internal volume of the horizontal part of the stem, in turn connecting to the various covered by the packers, the intervals of the reservoir by controlling the opening and closing of the access fittings.

2. The method according to claim 1, characterized in that as a contrast fluid used oil.

3. The method according to claim 1, characterized in that the movement of the contrast fluid in the wellbore during pumping track with modules, gamma-ray, resistivity meter or thermoconductive flow meter.

4. The method according to claim 1, characterized in that the potential watering intervals and the intensity of the absorption layer appreciate using modules gamma logging, thermometer and pulse (or stationary) neutron logging.

5. The method according to claim 1, characterized in that when performing measurements during injection, stop or stimulation applied a distributed fiber optic sensor thermal field.



 

Same patents:

FIELD: oil and gas industry.

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20 cl, 4 dwg

FIELD: oil and gas industry.

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1 dwg

FIELD: physics.

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10 cl, 4 dwg

FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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2 cl, 5 dwg

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1 tbl

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FIELD: oil and gas extractive industry.

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2 cl, 1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes performing a test pumping of liquid waste into absorbing well before operational pumping, while changing flow step-by-step. From equation of absorption base hydrodynamic parameters are determined for calculation of predicted coefficients of operation characteristics of absorbing well and reserve well. During operational pumping of liquid waste together with thermometry along absorbing well shaft, registration of actual pressures and flow on pump devices, actual pressures on mouth in tubing pipes of absorbing well, actual pressures on face are additionally registered in absorbing well as well as pressures on mouth in behind-pipe space, actual loss at mouth in behind-pipe space, actual loss of waste on mouth, actual positions of face well, upper and lower limits of absorption range from well mouth. In reserve well actual pressures on face are registered, as well as actual positions of liquid level from reserve well mouth, upper and lower limits of absorption range. Prediction coefficients are compared for operation characteristics of absorbing well and reserve well to actual coefficients. 9 conditions of hydrodynamic bed conditions at reserve well and absorbing well are considered during pumping of waste. Specific actions of operator on each condition are described.

EFFECT: higher reliability and trustworthiness.

1 ex

FIELD: geophysics.

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EFFECT: higher efficiency.

1 dwg

FIELD: oil and gas extractive industry.

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EFFECT: higher reliability.

2 cl, 6 dwg, 1 ex

FIELD: oil and gas extractive industry.

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EFFECT: higher efficiency.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: during recording of pressure change pressure is measured at mouth at tubing column entrance and in inter-tubular space. Recording of pressure change is performed on basis of pressures comparison before and after stopping of well on basis of speed of pressure fall at mouth and in inter-tubular space after stopping of operation well and on basis of pressures comparison before and after well launch for forcing on basis of speed of pressure increase at mouth and in inter-tubular space after well launch. As criterion of pressurization estimation a calculated value of liquid flow, which enters and exits inter-tubular well space is taken.

EFFECT: higher trustworthiness.

1 ex

FIELD: geophysics.

SUBSTANCE: method includes measuring amplitudes of longitudinal acoustic wave on two working emitted frequencies of signal along casing column within given range. Amplitudes of longitudinal wave of acoustic signal are recorded along column at two frequencies (high Ahf and low Alf) and on basis of relation of these values, normalized by maximal values at portion of non-cemented column Avr (Ahf/Avr and Alf/Avr), separation of cementation defects by major types is performed (ring space, volumetric defect, mixed defect) and values of their openness are measured.

EFFECT: higher trustworthiness and higher precision.

2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes lowering equipment into well and performing analysis during extraction of oil from oil beds. In accordance to invention after raising down-pumping equipment from the well liquid is replaced with degassed liquid, and research is performed during pumping in of degassed liquid into oil beds and extraction of degassed oil from oil beds, at the same time pumping is performed using exhaust gases under high pressure from moving compressor, and extraction of degassed oil - by letting exhaust gases out of the well. During that on basis of share of oil beds in total debit of product and extraction and on basis of face pressures during extraction and removal bed pressures of oil beds are determined together with their productiveness coefficient.

EFFECT: higher reliability and precision.

1 ex

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