The method of pulsed exposure to the oil reservoir

 

The invention relates to the production of oil with the use of pulsed exposure to the oil reservoir and provides a more effective way by expanding the control range of the pulse impact on the oil reservoir and reduce energy losses in the pulse chamber. The inventive method includes the increase of power by the pump pressure of the liquid column in the tubing string (NCC), is lowered into the well until the occurrence of excessive pressure in the IRP and the pulse chamber bounded by the casing and hard packer, overlying the annular space between the casing pipe and the NCC. Ensure the generation of pressure pulses due to the sharp periodic reset and increasing the pressure in the discharge line, indicating power pump with NCC, and the transmission of pressure pulses from the pulse chamber to the oil reservoir. According to the invention the liquid column in the IRP form at least two layers raznopolosnyh liquids. The density of the lower layer fluid accept higher density of the upper layer liquid. The height of the layer of liquid is determined on the basis of the maximum excess pressure developed in the pulse chamber when the hydraulic impact analytical is whether cement glass. 1 Il.

The invention relates to the production of oil with the use of pulsed exposure to the oil reservoir.

The known method of pulsed exposure to petroleum reservoir, comprising feeding into the well through the tubing pipe (tubing) of fluid under pressure and the consequent destruction of the set of diaphragms. The resulting pressure pulses are transmitted in oil well bottom zone of the well (Knots B. M. Application hydroshock stimulation by acid solution. - M.: VNIIEM, 1988, S. 7-15).

The disadvantages of this method are:

- limited number of pulses, a certain number of diaphragms installed in the casing;

- limited pulse repetition rate, as between successive pulses of exposure time is required for the descent into the well calibrated ball to cover the holes once the diaphragm.

The closest technical solution (prototype) is a method of pulsed exposure to the oil reservoir, including the increase of power by the pump pressure of the liquid column in the cased well and the transmission of pressure pulses from the well to the reservoir, which generate due to rez asarnoj column, lowered into the well, thus the pulse pressure is passed into the reservoir from the chamber bounded by the casing and hard packer lowered into the well on a tubing string (RF Patent No. 2151280, E 21 In 43/25, 1997).

The disadvantages of the known technical solutions are:

- limitations of the regulation of the amplitude of the pressure pulses only due to the pressure generated power pump, ceteris paribus;

- loss of pulse energy impacts associated with the fact that the pulse Luggage usually are limited from the bottom with a rubber stopper used in the cementing of wells, resulting in loss of energy to it.

The purpose of the invention is improving the efficiency of the method by expanding the control range of the pulse impact on the oil reservoir and reduce energy losses in the pulse chamber.

This goal is achieved by the method of pulsed exposure to the oil reservoir, including the increase of power by the pump pressure of the liquid column in the tubing string (NCC), is lowered into the well until the occurrence of excessive pressure in the IRP and the pulse chamber bounded by the casing and hard packer blocking ring millet and increasing the pressure in the discharge line, reporting power the pump with the IAC, and the transmission of pressure pulses from the pulse chamber to the oil reservoir, the liquid column in the IRP form at least two layers raznopolosnyh liquids, the density of the lower layer of the liquid is higher than the density of the upper layer liquid and the height of the layer of liquid is determined from the condition of maximum overpressurePydeveloped in the pulse chamber when the hammer

PyPC.d(hl+(H - h)tg,

where RC.d- maximum allowable pressure in the impulse chamber at the well bottom; N - the total length of the NCC; h - height of the layer of light liquid;t,l- the density of the heavy and light fluid; g is the acceleration of gravity,

at the bottom of a well set additional hard packer or cement glass, bounding pulse chamber.

The advantages of using as the liquid column filling the SAC and the pulse chamber raznopolosnyh liquids, due to the fact that, ceteris paribus (the same response time and size glubiny h, filled environment with low densityland the lower part is filled environment with a high density oft, the excess hydrostatic pressure at the well bottom, which in this case is equal to the pressure in the pulse chamber is equal to RC.article=(hl+(H-h)ptg. If afterPyto indicate excessive pressure generated by the pressure source when the hydraulic impact, based on conditions not destruction of the casing, which occurs when pressureC.pthe pressure on the borehole bottom at hammer PC.ymust satisfy the condition

PC.y=Py+PC.article=Py+(hl+(H - h)tgPC.p.

From this formula it follows that the less the hydrostatic pressure at the bottom hole PC.articlei.e. the smaller the density of the liquid, the greater the excess pressure due to the water hammerPycan be created, and therefore, may increase the amplitude of the pulse impact on the oil reservoir.

what can be used condition, in the critical zone should not be the destruction of the original oil reservoir. In this case the maximum pressure that can develop when the surge layer, should not more than two times greater than rock pressure Pg(Popov A. A. impact on the bottom zone of the wells. - M.: Nedra, 1990, S. 85).

In General, you can burn that excess pressure at the well bottom by water hammer, must satisfy the condition

PyPC.d(hl+(H-h)t)g (1)

where RC.d- maximum allowable pressure at the well bottom, defined as the value of PC.p, 2Pgor other condition.

Excessive pressure generated in the hydraulic shockPydue to the excessive pressure created by the force pumpPnratio (ibid, S. 80-85)

Py=((2·Pn/)(K/(1+(d·K//E))))1/2,

wherethe velocity coefficient; K is the modulus of the fluid (PA); d - internal dariela wall of the casing (PA).

If the last formula for simplicity, assume that the speed ratio is equal to one, when d=10-1m,=10-2m, E=2·109PA (water) and 1.3·109PA (oil), E=200·109PA, which corresponds to the expected values of the parameters, the last formula becomes close

Py=(2·Pn·To)1/2. (2)

From the last formula it follows that the same impulse overpressure may be created, or by increasing overpressurePngenerated by the pump from the liquid with a small modulus of elasticity E, or due to the smaller pressure increasePnin the liquid with a large modulus of elasticity that is,

Thus, the height of the layers of light and heavy liquids shall be determined from the conditions of the maximum value of overpressure, which can develop the high-pressure pumpPn, liquid properties (and K), the depth of oil layer (N) and the magnitude of the maximum permissible pressure at the well bottom PC.d.

The establishment of the bottom hole hard packer or cement glass, the usual used in the cementing of wells.

The drawing shows a scheme of binding well to pulsed exposure to the oil reservoir.

The method can be implemented as follows.

The impact on oil reservoir passes through the casing cemented column 1 with non-perforated or perforated interval, if there is no inflow or injection of fluids.

Well set column 2 tubing and the annulus between the casing and tubing above the roof of the reservoir cover hard packer 3. At the well bottom, below the soles of the layer set hard packer or cement glass 4. Pulse chamber 5 forms part of the casing, limited packers 3 and 4. In the discharge line 6 column 2, is connected to the power source of high pressure 7, has operated valve 8. The valve 8 may be activated from a control device (not shown) or when the preset pressure limits.

When the high-pressure pump 7 in the pulse chamber 5 occurs the maximum gauge pressure at which the valve 8 is switched and the excess pressure in the fluid line 6 to line 9 is discharged into the tank 10. Tasos 7 is translated in the recirculation mode. After a sharp discharge pressure to the set value, the valve 8 is returned to its original state, and the pressure in the chamber 5 again increases to a specified level.

Example parameter definition

PC.d=8·107PA, H=2000 m,Pn=106PA,l=850 kg/m3Tol=1,33·109PA,t=850 kg/m3Tot=2·109PA.

Setting h=0, i.e. if only the heavy liquid (water), we obtain that the calculation by the formula (1) givesPy6·107PA, and the formula (2)Py=6,3·107PA. This means that the generated pressure pulse exceeds the allowable value.

Setting h=2000 m, i.e. if there is only a light liquid (oil), we obtain that the calculation by the formula (1) givesRu6,3·107PA, and the formula (2)Py=5.2 x 107PA. This means that the generated pressure pulse can be increased, as it is less than the maximum allowable.

Optimum is filling tubing fluids, in which the permissible pressure pulse rudedog raznopolosnyh layers

K=Kt/((1-h/H)+(ht/H/Kl)).

Equating (1) and (2) we obtain that for h=180 mPy=6,06·107PA. Thus, the height of the lower layer, consisting of water equal to 1820 m, at the top, consisting of oil - 180 m

By changing the height of the layer of light liquid h it is possible to lower the hydrostatic pressure at the bottom hole PC.articleand on the other hand, the pillar of light liquid acts as a kind of damper, somewhat reducing the amplitude of the surge, which is created on the bottom of a well, because, as a rule, the lighter fluid has a lower modulus of elasticity.

The pressure pulses created in the chamber 5 of the hydraulic force through the walls of the casing and the cement stone 13 is transferred into the reservoir 12. The amplitude of pressure surges is specified operating pressure developed by the pump 7, and the pulse frequency corresponds to the frequency of operation of the valve 8 provided that the performance of the pump is much more than the amount of fluid discharged into the reservoir 10, and does not require any operations in the well.

The proposed method of pulsed exposure to the oil reservoir has a wide control both the amplitude and isoamyl high-pressure pumps and regulating valves. After exposure and education in the oil reservoir of additional cracks can be performed in the process of mastering punch a hole (perforation and stimulation of oil) according to standard technology.

Claims

The method of pulsed exposure to the oil reservoir, including the increase of power by the pump pressure of the liquid column in the tubing string lowered into the well until the occurrence of excess pressure in the tubing string and the pulse chamber bounded by the casing and hard packer, overlying the annular space between the casing pipe and tubing column, generating pressure pulses due to the sharp periodic reset and increasing the pressure in the discharge line, indicating power pump with tubing column, and the transmission of pressure pulses from the pulse chamber to the oil reservoir, characterized in that that the liquid column in the tubing string to form at least two layers raznopolosnyh liquids, the density of the lower layer of the liquid is higher than the density of the upper layer liquid and the height of the layer of liquid is determined from the condition of maximum �/img.russianpatents.com/chr/916.gif">PyPZV(hl+(H - h)tg,

where RZV- maximum allowable pressure in the impulse chamber at the well bottom;

h - the height of the layer of light liquid;

lthe light density of the liquid;

N - the total length of tubing drill string.

t- the density of the heavy liquid;

g - acceleration of gravity,

at the bottom of a well set additional hard packer or cement glass, bounding pulse chamber.

 

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