Method for increasing wells productiveness

FIELD: oil and gas industry.

SUBSTANCE: method includes placement of deep operation body in perforation zone, capable of forming pressure pulses via remote initiation of gas mixture explosions. Depression of bed is performed by lowering liquid level in a well, forming a certain volume of explosive gas mixture in deep body, performing multiple effect on bed without raising of body until well product influx increases. Explosion pressure is set on basis of hydrostatic pressure of well liquid and volume of explosive gas mixture on basis of table provided in description.

EFFECT: higher efficiency.

1 tbl

 

The invention relates to the field of the exploitation of oil, gas, water and other wells and can be used to increase the productivity of wells by increasing the permeability of the rocks of the productive formation and purification of the near-wellbore zone from clogging deposits.

A method of processing a productive formation by vibration wave impact, carried out with the help of powerful sources installed at the wellhead [vibration wave impact with the surface of oil reservoirs. - Oil economy, No. 3, 1995, s-28]. The impact is to use the energy of compressed air with its subsequent transfer to the post scarinci fluid, a reciprocating movement which acts on the reservoir. As a consequence, the reservoir is the excitation of resonance oscillations of individual parts and units with energy release stress state of rocks in the form of secondary acoustic radiation. Such fluctuations lead to an increase in microcracks and a General increase in well yield.

However, this known method of formation treatment is hard to use because of the need for bulky equipment, power supply. In addition, this method has low efficiency, since the source of the pressure pulses is not in the treatment area square is one hundred, and on the surface and so excited on the surface of the pressure pulses have a small reservoir depth distribution.

Closest to the proposed method to the technical essence and the achieved result is a way of bottomhole zone treatment, including the impact on bottom-hole formation zone of the compressed gas mixture in the form of a sequence of pressure pulses in excess of mountain pressure [RF Patent №2105871]. Deep projectile is charged on the surface of the gas mixture so that the pressure of the mixture in the mine exceeded due to the influence of the temperature in the mine rock pressure 1.5 times. After the descent of the depth of the projectile and stop in perforations realize the impact of the pressure pulses by depressurization of the reservoir depth of the projectile, by adjusting the interval between the start pulse.

However, the known method has poor performance due to non-use of the energy of formation, a limited number of pulses of high intensity, due to the fixed supply of the gas mixture in the tank depth of the device, the lack of an operational remote management and control of the intensity and results of stimulation. In addition, for the implementation of this method requires sophisticated equipment to create deep projectile the touch pressure of the gas mixture, placing the device in the bottom hole requires increased security measures.

The objective of the invention is to increase the productivity of wells in the stages of development and repair of wells.

The technical result consists in increasing the efficiency of processing bottom-hole formation zone through the use of energy formation and optimization of multiple stimulation without lifting depth of the projectile by regulating the pressure and the number of pulses and continuous monitoring of downhole inflow of the product.

The task and the technical result is achieved by the fact that in the proposed method, including creating pressure pulses deep projectile mounted in the perforation zone, in contrast to the known set in perforations deep projectile capable of generating pressure pulses through remote initiation of the explosion of the gas mixture, carry out a depression in the reservoir, lowering the level of liquid in the well, creating a deep projectile certain amount vzryvopodobnoe gas mixture and produce multiple effects on the reservoir without lifting depth of the projectile to increase the flow of downhole product, the pressure of the explosion set by the formula

P=a+kV,

where V is the volume of the gaseous mixture at the moment of explosion, and to the function of hydrostatic pressure fluid is STI in the well.

The method is as follows. The perforations on the logging cable set deep shell, make a depression in the reservoir, lowering the level of the well fluid, which is controlled by the transmitter. Then using the current generator formed in the combustion chamber deep projectile vzryvopodobnoe a mixture of gases, for example oxygen and hydrogen. When a certain volume of the gas mixture, the value of which is determined by using a sensor installed in the combustion chamber, producing the initiation of the explosion of a gas mixture of high-voltage electric pulse. The explosion pressure is set by the formula

P=a+kV,

where V is the volume of the gas mixture at the moment of explosion, and to the function of hydrostatic fluid pressure in the well.

Arose shock wave destroys the continuity of sediment clogging the near-wellbore area of the formation that forms in the productive formation of additional cracks. The impact on the formation conditions of depression accelerates hydrodynamic filtration and the flow of the well fluid, which contribute to the removal of the destroyed sediment from the pores and cracks, which provides an increase in the productivity of the well.

In a given perforation interval to produce a series of pressure pulses until then, unless there is an increase in the inflow borehole product, which octanal who live with sensor placed in the well.

Thus, the proposed method allows to increase the effectiveness of bottom-hole formation zone by forming a depression on the formation and optimization of pulsed-wave effects on the bottomhole zone by remote control pressures and the number of pulses and control the flow of downhole product.

The calculated values of pressure PEOIexplosive pulse at different volumes of gas mixtures and different hydrostatic pressures Prcthe downhole fluid in the table.

Prc=3 MPaPrc=5 MPaPrc=10 MPa
V cm3PEOIMPaV cm3PEOI, MPaV cm3PEOI, MPa
1006100910016,5
20010,520016,520031,5
300153002430046,5
500245003950076,5

Objects of the impacts of the proposed method are:

1. Well, out of drilling or after repair with a rate below its potential.

2. Wells, lowering the flow rate in the operation.

3. Well, fishery characteristics (flow rate, cumulative production) lower than in the neighbouring operated in a similar geological and operating conditions.

In the planned wells to the following recommended intervals for effects:

1. The intervals with the highest filtration-capacitive properties of reservoir rocks at abnormally low tributaries.

2. Intervals with high fracturing or complex structure of the pore space, not giving a potential flow rates.

3. Intervals with deposits of paraffin, hydrates and plugging. Pilot testing of the proposed method, conducted in the fields of Western Siberia, showed the production feasibility of using this technology for intensification of gas-dynamic and hydrodynamic processes in the critical zone of the reservoir.

Method of increasing the productivity of wells, including creating pressure pulses deep projectile mounted in the perforations, wherein the set of deep projectile, capable of being the th to generate pressure pulses through remote initiation of the explosion of the gas mixture, are depression on the layer by lowering the liquid level in the well, creating a deep projectile certain amount vzryvopodobnoe gas mixture and produce multiple effects on the reservoir without lifting depth of the projectile to increase the flow of downhole product, and the explosion pressure (PEOI) is set by the hydrostatic pressure of the well fluid (PGS) and vzryvopodobnoe gas mixture (V) according to the table given in the text description.



 

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FIELD: oil and gas industry.

SUBSTANCE: method includes placement of deep operation body in perforation zone, capable of forming pressure pulses via remote initiation of gas mixture explosions. Depression of bed is performed by lowering liquid level in a well, forming a certain volume of explosive gas mixture in deep body, performing multiple effect on bed without raising of body until well product influx increases. Explosion pressure is set on basis of hydrostatic pressure of well liquid and volume of explosive gas mixture on basis of table provided in description.

EFFECT: higher efficiency.

1 tbl

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