Method for extraction of hydrocarbon deposit with sole water and extraction of hydrocarbon by sucker-rod compressor pump with separated intake of hydrocarbon and water

FIELD: oil extractive industry.

SUBSTANCE: method includes mounting compressor pump in such a way, that input aperture of tail piece was positioned below bed sole. Prior to that water cone in face-adjacent zone is destroyed by draining water through tail piece, connected to lower suck-in valve of compressor pump cylinder, and along behind-pipe space through side suck-in valve of compressor pump cylinder. In case of increase of hydrocarbon contained in drained liquid beginning of water cone destruction is assumed. Draining is continued until destruction of emulsion in water cone, formed in non-homogenous porous environment of bed at limits of hydrocarbon-water and water-hydrocarbon, separation of water and hydrocarbon streams and bringing current water-hydrocarbon contact to initial position. Then during extraction water is drained through tail piece, and hydrocarbon - along behind-pipe space.

EFFECT: higher yield.

3 cl, 1 dwg

 

The invention relates to the oil industry, and in particular to methods of development of deposits of hydrocarbons in bottom water and production of hydrocarbons - oil, gas, gas condensate - oil-pump-compressor-type APC.

In domestic and international practice is widely accepted methods of artificial flooding and its variants. In Russia, about 90% of oil is extracted using flooding.

Currently, most of the fields of natural hydrocarbons such system development are at an advanced stage of operation and is characterized by a steady decrease production levels of oil and gas, a sharp increase of water production, mass reduction of operating Fund wells due to the unprofitability of their further operation.

In addition, there are a number of oil deposits with complicated conditions:

- waterfowl crude oil,

- oil reservoir with low productivity,

- oil wells with low formation and downhole pressures,

- oil wells with high gas-factors (500-1000 m3/t)

- oil reservoir with a gas cap,

- rim oil in the gas and gas condensate fields and so on, with the development and operation of the existing technology of production of carbohydrate which has a low birth indicators, and the cost of formation energy of the gas flow and reservoir temperature wasteful.

During operation of wells in a well-drained part of the reservoir and the bottom zone in the volume of the depression cone is formed a cone of water, consisting of different proportions of the emulsion of the first and second kind, which reduces the permeability of oil and is a barrier to the flow of oil from oil-saturated part of the reservoir. In these conditions, the method of artificial flooding and the existing technology of oil has accumulated a lot of negative factors and does not meet the requirements of practice, oil, gas and condensate.

By this time developed many different methods and technologies to increase the current oil recovery by carrying out various kinds of processing wellbore zones (OPZ) on the basis of new equipment and new technologies lift oil. In recent years, extensive use is made of purchased fracturing and sidetracking to go on the oil-saturated part of the reservoir or deverbative lens pillars. Pass industrial tests dilatation wave impact on rock formations in the well bottom hole, equipped with SRPS, which use variable fields of elastic deformations on the background of the abnormal static stresses. Unfortunately, most of the new well-known is erodov and technologies require significant costs and therefore do not reduce, and often increase the cost of oil and do not solve the problem of increasing the profitability of wells in depleted fields. The performance overhead for production of 1 t of oil such methods ten times higher than the performance overhead on the production of one ton of oil in the extraction of the proposed method.

There is a method of oil and gas-liquid mixtures through the pump unit with separate admission of oil (oil mixture) and water (APCS), which pumped water through the shank, below the level of the oil-water contact in the reservoir and connected with the lower suction valve cylinder APCS, and oil (gas mixture) for the annular space through the side suction valve cylinder APCS (SU 1323743, IPC F 04 47/02, publ. 15.07.1987).

The disadvantage of this method is the low efficiency in the conditions described above equipment and technology for the production of hydrocarbons for the destruction of the cone of water, preventing the flow of oil from oil-saturated part of the reservoir, and the reduction effect in the production of hydrocarbons.

The objective of the invention is to increase the current oil recovery and production of hydrocarbons (oil, gas, condensate, oil and gas mixture) operated on oil, gas and gas condensate fields, the improvement of energy efficiency of natural resources.

Technical re is the query result of the invention - the increase in produced hydrocarbons by ensuring the destruction of the cone of water formed in the wellbore area, and messages of oil-saturated part of the formation from the wellbore.

The technical result is achieved in that in the method of developing hydrocarbon deposits with plantar water and production of hydrocarbon oil pump-compressor with separate reception hydrocarbon and water-type APCS, which set the pump-compressor so that the inlet shank was located below the bottom of the reservoir, previously exercised by the destruction of the cone of water in the bottomhole formation zone by pumping water through the shank connected to the lower suction valve cylinder APCS, and the annular space through the side suction valve cylinder APC and with the increase in the pumped liquid hydrocarbon content, draw conclusions about the beginning of the destruction of the cone of water, continue pumping until substantial or complete destruction and erosion of the emulsion in the cone of water, resulting in a heterogeneous porous medium layer on the borders of the hydrocarbon-water and water-hydrocarbon separation of flows of water and hydrocarbon and bring the current Vodopianov contact to its original position, and then in the process of production continue to pump water through the shank, and a hydrocarbon - annulus is the space.

In addition, it is preferable to use a pump-compressor with distance from the bottom of the suction valve to the side, chosen from a selection of all incoming on the bottom of the borehole water.

In addition, at the stage of production of hydrocarbons, it is advisable to control the ratio of the inflow of formation water and the amount of pumped water, and when the inequality to adjust the position of the plunger cylinder APCS so that these values are equal.

The technical result is achieved due to the fact that a significant or complete destruction and erosion of the emulsion in the cone of water and bringing the current KSS to the original position when working APCS provided:

- change the direction of the layer of water and hydrocarbons in the cone of water in the bottom hole zone of the well.

oscillatory processes in the trunk and the bottom-hole zone of the well formed by plunger goes up and down when working APCS;

- substantial or complete the selection (pumping) of the incoming produced water to the reception of the shank.

The destruction of the emulsion, separation of flows of water and hydrocarbon is using sucker rod tubing installation for separate selection of water and hydrocarbons from the reservoir (APCS), lowered into the well so that the receiving device shank had the b below the bottom and the water is pumped on to the shank, and hydrocarbons were pumped through the annular space through the side intake valve in the cylinder APCS.

The drawing shows one of the installation options for the implementation of the method.

Sucker rod pump-compressor with separate reception (PPR) includes a housing 1, a cylinder 2, in the lower end of which has a bottom suction valve 3 and to the side wall attached to the side of the suction valve 4. In the cavity of the cylinder 2 is a piston 5 with the discharge valve 6. The lower part of the cylinder is connected to the shank 7 of the tubing or long tubes of smaller diameter with a filter and a cover on the end.

The production method according to the invention is implemented as follows.

The main forces holding the emulsion in a heterogeneous porous medium when squeezed out of water, are capillary forces. By reducing the action of capillary forces by reducing the interfacial tension of from 25 to 0.01...35...of 0.001 mn/m is achieved almost full (up to 95...98%) of oil displacement. Therefore, the separation of the flow and change of the direction of movement of hydrocarbons and formation water in the cone bottom hole zone of the well is the essence of the development of oil, gas deposits and deposits of gas condensate fields with bottom water.

The lower part of the shank 7 with filter and cap descends below podos the s layer. When starting the pump, due to the difference in the densities of hydrocarbon and produced water flow line in the water will turn down in the filter portion of the shank 7 and is pumped by the pump through the lower suction valve 3, and a water-oil mixture in the annular space to be pumped through the side valve 4 pump compressor. At the conclusion of the well to the regime in the annulus will be replacing water in the oil, created favorable conditions for the destruction of the emulsion and the message of the wellbore with the oil-saturated part of the reservoir will increase the dynamic level. Due to long cycles progovorennogo impact of longitudinal vibrations in the cone of water will weaken the capillary forces and surface tension forces on the borders of the oil-water and water-oil, will gradually begin to break down the emulsion and form stable channels filter oil due to the merger of drip oil in the chain of continuous saturation in the work of the APC. In the first place will begin to break down the emulsion in the upper part having the smallest radius and volume of the emulsion. The use of this method allows to increase the permeability of oil and reduce permeability by water, the percentage of water decreases. To reduce the percentage of water in the pumped fluid can be judged from the beginning of the message, the oil-saturated part of the reservoir with which talom well. This process can take several months until you are destroyed all the emulsion in the cone and it will not settle to the original OWC (oil-water contact). All this time will decrease the process of watering. When reaching the initial KSS reduction in the percentage of water in crude production will cease. Resource oil with a reduced percentage of produced water and increased the percentage of oil will continue to until will not refuse the pump. All of the above equally applies to other hydrocarbons - gas, gas mixture, gas condensate.

There are several designs of pump-compressor type APC: APC-44 (see SU 1323743), 3 APCS, 4 APCS, NC-44 (see US 6182751), 1 APCS, 5 APCS (EN 2112890), 2 APCS (EN 1128090).

They can be used for the implementation of this method. The sizes of the pump-compressor can be made plug-in type NRPV and navstevni - PPR size from 38 to 57 mm or more depending on the size of the operational columns.

For operation of flooded wells up to 20-30%, 50-60% and 80-99%, it is necessary to use pumps APCS with different position of the side valve 4 from the bottom of the suction valve 3 and to fulfill the main requirement of the technology of extraction of oil through the lower suction valve 3 should, ideally, to take as much water as it enters the borehole bottom. This is the first reg is of the split flows and selection of produced water. If the cut up to 20-30% and APC-44 provides complete pumping column of produced water from the bottom of a well in accordance with the location of the lateral camera - 0.8 m from the bottom of the suction valve 4, that is the destruction of the cone of water, the reduction in the percentage of produced water and increasing the percentage of oil. After going to happen the maximum reduction in the percentage of water cut wells and it will not decrease any further, you need to remove the dynamometer pump type APC and the loads on the rod relative to the zero line (indicating the weight of the rod) to define the boundary pumping produced water. Pumping water from the borehole bottom, you can also determine by calculation by multiplying the diameter of the cylinder at a distance from the bottom of the suction valve to the side of the valve, and to compare this result with the actual sampling at the wellhead traditional method.

If the inflow of formation water to the face less than possible pump for pumping water, proceed to the second stage of regulation selection of produced water and oil. To do this, pull back on the mouth of the polished rod and lock it in traverse cable hangers that we raised the plunger from the bottom of the suction valve and thereby reduce the sampling formation water and increase the extraction of oil by increasing the stroke of the plunger relative to the side of the chamber p and the same stroke length. Similarly arrive at the watering hole at 50-60% and 80-99%.

If the original data cut more than 20-30% and take away all the water from the borehole bottom is not possible (the inflow of water is equal to or more selection), then apply the pump APCS with another length of the side chamber, for pumping wells with water up to 50-60% of produced water is the lateral distance of the camera to 1.5 m

If the original data cut more than 60%, to take all the water from the borehole bottom with side camera up to 50-60% is not possible (the inflow of water is equal to or more selection), then apply the pump APCS with a different lateral distance camera - 1.8 m

Smooth regulation of the selection of the oil and water in the irrigation well at 50-60% and 80-99% are produced in the same manner as regulation, irrigation well at 20-30%.

Application of the proposed method using the pump-compressor type APC allows you to:

1. To increase the production of hydrocarbons and the current return of the layers due to the following factors:

- increase the pressure of the oil and gas mixture at the inlet to the pump due to the different densities of oil and water respectively in the annular space and the shank section of the pump. Message-saturated part of the reservoir with wellbore and the pump intake through the side of the camera makes the most efficient use is to use pressure, without loss overcoming the column of produced water during normal pump sucker rod pump;

- increasing the efficiency of operation of the pump APCS in connection with the exception of the effect of harmful space in the lower valve (filled pumped through the shank of water) in comparison with the conventional technology oil production;

- providing a separate input of oil and water in the cylinder when the oil eliminates the conditions for the formation of viscous and stable oil-water emulsions (water production from 40 to 75%), which provides a factor of filling pump to 0.8 etc.

2. To reduce losses and to effectively use stratiform temperature, because with the rise of the coolant - water reservoir on the shank, no contact with her column over the oil in a circular annulus, and reduce or eliminate the deposition of paraffin in the lift pipe and the corrosion processes in the production string.

3. Efficient use of natural and associated gas at high gas factor entering the cylinder through the side valve through the formation of a gas tube in the upper part of the cylinder, the compression the pressure of a column of water oil and gas mixture in the lift pipe when plunger goes down and create cork (close to a blowout) mode of operation of the well.

1. The way to develop hydrocarbon deposits with plantar water and production of carbohydrate is kind of a sucker-rod pump-compressor with separate reception hydrocarbon and water, which set the pump-compressor so that the inlet shank was located below the bottom of the reservoir, previously exercised by the destruction of the cone of water in the bottomhole formation zone by pumping water through the shank connected to the bottom of the suction valve of the cylinder of the pump-compressor, and the annular space through the side intake valve of the cylinder of the pump-compressor and with the increase in the pumped liquid content of the hydrocarbon make a conclusion about the beginning of the destruction of the cone of water, continue pumping until the destruction of the emulsion in the cone of water, resulting in a heterogeneous porous medium layer on the borders of the hydrocarbon-water and water-hydrocarbon separation of flows of water and hydrocarbon and bring the current Vodopianov contact to its original position, and then in the process of production continue to pump water through the shank, and a hydrocarbon - annular space.

2. The method according to claim 1, characterized in that the use of pump-compressor with distance from the bottom of the suction valve to the side, chosen from a selection of all incoming on the bottom of the borehole water.

3. The method according to claim 1 or 2, characterized in that at the stage of production control the ratio of the inflow of formation water and the amount of pumped water and the inequality regulate the position of plan the EPA cylinder pump compressor so so these values were equal.



 

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