RU2320863C1 - Mobile through hydroimpulsive rig for bottomhole reservoir zone cleaning - Google Patents

Abstract

FIELD: oil production, particularly well development and oil production stimulation.

SUBSTANCE: mobile through hydroimpulsive rig comprises hydroimpulsive pump with pressure accumulator connected thereto. Pressure accumulator comprises check valve with locking member, namely ball, valve seat and rod. Pressure accumulator is arranged in lower part of downhole rig. The rod is hollow and carries seat. Ball is made of steel and may be dropped onto valve seat after reactive bath accompanied by hydraulic impacts application through hollow rod. Pressure accumulator has resilient valve and sized orifice, which create additional hydraulic impact.

EFFECT: increased technological and economical efficiency of well development methods, possibility to clean bottomhole reservoir zone and improved oil production stimulation due to creation of multiple depressions with reactive bath forming in under-packer zone in one trip.

4 cl, 1 dwg

Description

The invention relates to the oil industry, in particular to the development of wells and the intensification of oil production.

A well-known installation for well development, comprising a pump made in the form of a stepped cylinder with a plunger, discharge and suction valves, an energy accumulator made in the form of a ball of elastic material placed in a large cylinder stage and placed on the rod, with a large cylinder stage connected to a smaller intermediate pipe, and on the upper end of the stage of the smaller cylinder is a shock absorber (RU No. 2182677, op. May 20, 2002).

The main disadvantages of this device is that water hammer spreads over the entire casing string, which can violate the integrity of the string and contribute to the formation of annular flows. In this case, the energy of hydroblow is consumed unproductively, because the zone of the reservoir is not localized and the reservoir experiences both depressive and repressive effects.

In addition, the use of the device requires the use of additional special equipment, which leads to additional costs, and with low permeability of the formation and deteriorated as a result of anthropogenic impact of filtration, the above method does not give a positive effect.

A hydraulic pulse installation for well development is also known, while treatment of the bottom-hole zone of the formation is performed by the depression method, in which the separation of the pipe and annular spaces is carried out by installing a packer in the annular space and a check valve in the tubing, discharge the fluid extracted during the instant depression, and Depression on the formation is caused by water hammer from the discharge of the pressure accumulator installed above the hydraulic pulse pump during the communication of the overpack space nstva with annulus (RU № 2263207, 16.02.2004, at 3 -. prototype).

The disadvantage of this method is that with low permeability of the reservoir and its clogging as a result of anthropogenic impact, existing methods of well development, including the aforementioned, do not give a positive effect, because lead to an increase in water flow, which ultimately blocks the flow of oil. This is due to the fact that the arrangement of the pressure accumulator above the hydraulic pulse pump does not allow pumping chemical reagents into the formation, and part of the energy of the hydraulic shock is extinguished in the pump elements.

In addition, a significant drawback of the aforementioned prototype is the lack of an individual autonomous hydraulic drive of a hydraulic pulse pump and a system for automatically controlling the operation of the pump.

The objective of the invention is the development of a mobile installation to improve the technological and economic efficiency of methods for well development, cleaning the bottom-hole formation zone (BHP) and the intensification of oil production due to repeated "instant" depressions when creating a chemically active bath in the sub-packer zone in one round trip. The creation of a chemically active bath in the sub-packer zone before the well development helps to break down the bonds that hold the mud in the pore space of the oil horizon, and this will allow for more uniform cleaning of the bottomhole formation zone and align the inflow profile due to the involvement of stratified oil strata in the operation.

The essence of the invention lies in the fact that the installation of a mobile through-passage hydraulic pulse for cleaning the bottom-hole zone of the formation, comprising a hydraulic pulse pump with an attached pressure accumulator, including a non-return valve with a locking element - a ball, a valve seat and a rod, while the pressure accumulator is located in the lowest part of the depth installation, the stem is hollow and a saddle is mounted on it, the ball is made of steel and dumped onto the valve seat after a chemically active bath, accompanied by water hammer through the hollow , The pressure accumulator has a resilient valve and a calibrated orifice forming a further water hammer; the ground part of the installation consists of a power pump unit that pumps the working fluid into the fluid flow switching system and the automation unit of the working fluid flow switching system; the supply of working fluid from the pumping unit is carried out via the discharge line, and the flows are switched by valves operated by a hydrostation, and the entire ground part of the installation is stationary mounted on the chassis of a high-cross-country vehicle and equipped with an insulated process unit.

A mobile in-line hydraulic pulse installation for cleaning the bottom-hole formation zone (UPGS-M) (see drawing) consists of the underground part - a hydraulic pulse pump with a pressure accumulator, while the injection of a chemically active liquid occurs through the hollow stem of the hydraulic pulse pump into the pressure accumulator chamber, where the elastic valve passing through a calibrated hole, creates water hammer, and after dropping into the seat of the non-return valve of the locking element - a steel ball, an elastic valve, moving to the top of the battery pressure lation, becomes the check valve of the hydro-pulse pump and the ground power unit with automatic switching of the hydraulic pump drive. The power part of the installation consists of a pump forcing the working fluid into the system of the fluid flow switching unit and the automation unit of the working fluid switching system.

The hydro-pulse pump is cut off by the packer and creates depression in the local sub-packer zone. At the same time, in the deep part of the device there is a body with a pressure accumulator built into it, having an elastic valve and a calibrated hole forming an additional water hammer, and a check valve, which allows discharge of the under-packer zone by dumping the fluid extracted from the reservoir into the over-pack annular zone.

The pressure accumulator is installed in the lowest part of the deep installation, and the rod connecting the pistons 7 and 10 of the pump is hollow.

A chemically active liquid is pumped through the tubing through the hollow rod through the tubing using a pressure accumulator into the under-packer zone and the reaction is given or buffer fluid is injected to force the chemical reagent. The entire period of injection of the chemical reagent in the annulus creates excessive pressure and the annular valve is closed. After the completion of the chemical treatment operation without a free shutdown, the pumping part of the installation is switched on using a special valve mounted on a hollow stem.

The implementation of the possibility of turning on the pumping unit is ensured by the discharge into the tubing of a steel ball 6, which overlaps the upper part of the hollow rod by landing in the valve seat (5).

The drawing shows a General view of a device for creating a sub-packer zone of a chemically active bath and hydro-pulse exposure in the mode of multiple depressions.

The entire ground part of the installation is permanently mounted on the chassis of a cross-country vehicle and is equipped with a warmed process unit. Power supply is carried out from the well cluster power system for the period of development work.

The underground part of the installation is transported to the place of production of wells by the same vehicle on which the ground part is mounted.

The ground part of the UPGS-M installation (1) consists of a power pump unit, to the reception of which a working fluid flows from the topping tank (2) through wellhead fittings (3). The pump unit delivers the working fluid through the discharge line (4) to the flow switching unit, while the flow is switched by valves operated by a hydraulic station. Signals about switching valves are given from the control panel of the ground part of the installation.

Before the start of well development, a chemically active fluid (HAC) is pumped through the tubing and through the passage channel of the hollow rod enters the sub-packer zone. In the mode of hydroblows created by a pressure accumulator located in a sub-packer zone, HAC destroys the bonds that hold the co-fluid in the pore space of the PPP. After the first cycle of hydraulic impacts by applying HAC, the injectivity of the well is checked by holding it under pressure. If the result is unsatisfactory, the injection of HAC in the mode of hydraulic shock can be repeated.

After completion of the operation to break the collimant bonds in the tubing, a ball is dropped, which, by landing in the saddle mounted on the hollow rod, closes the passage channel and allows you to start the cycle of hydraulic pulse well development in the mode of multiple depressions.

At the beginning of well development, the working fluid is fed into the annulus between the casing and the injection line - tubing (4) and pressure is transmitted through the drainage hole (8) to the pump drive, while the piston (7) begins to move upward, entraining it rigidly connected to by means of the rod (16) the lower piston (10). The non-return valve integrated in the piston (7) remains closed and fluid flows from the reservoir into the piston space, while the elastic valve (13) of the pressure accumulator (12) blocks the calibrated hole (17), accumulating pressure due to compression of the elastic valve when the piston moves (7) up. During the "slipping" of the elastic valve through the calibrated hole, a hydraulic shock occurs, accompanied by an "instant" depression on the formation.

To discharge the fluid extracted from the reservoir, automatic switching of the flow takes place in the surface part, pressure begins to flow through the tubing (4), while the annulus remains open.

Under the action of pressure on the piston (7), the stem begins to move downward, pushing the piston (10), while the suction valve (18) opens and the formation fluid from the sub-packer space through the bypass valve (9) flows into the annular super-packer space, while the packer (11 ) provides overlapping repressive effects on the reservoir.

The cycle is considered completed when a predetermined extracted volume of fluid flows from the annulus into a measured tank. Then, in the same sequence, the next cycle begins. The number of operating cycles is set technologically from the calculation of the volume of fluid required for extraction from the reservoir, and is carried out automatically by a ground station mounted on a self-propelled chassis. The flow meter installed on the discharge line allows you to keep track of the fluid extracted from under the packer space. All changes in temperature and pressure are recorded by the stand-alone instrument IMSP-14.

Claims (4)

1. Installation of a mobile through passage hydraulic pulse containing a hydraulic pulse pump with an attached pressure accumulator, including a check valve with a locking element - a ball, a valve seat and a rod, characterized in that the pressure accumulator is located in the lower part of the depth installation, the rod is hollow and a saddle is mounted on it , the ball is made of steel and dumped onto the valve seat after a chemically active bath, followed by water hammer through the hollow rod, while the pressure accumulator has an elastic valve and is calibrated e hole forming an additional water hammer. 2. Installation according to claim 1, characterized in that its ground part consists of a power pump unit that pumps the working fluid into the fluid flow switching system, and an automation unit of the working fluid flow switching system. 3. The installation according to claim 2, characterized in that the supply of the working fluid from the pump unit is carried out along the discharge line, moreover, the flows are switched by valves operated by a hydraulic station. 4. The installation according to claim 2, characterized in that the ground part is stationary mounted on the chassis of a high-cross-country vehicle and is equipped with an insulated process unit.