RU131075U1 - INSTALLATION FOR SIMULTANEOUS SEPARATE PRODUCTION AND PUMPING IN ONE WELL - Google Patents

Abstract

Installation for simultaneous separate production and injection in one well, containing two columns of tubing of different diameters, a rod string, a sucker rod pump, a packer for separating productive and injection reservoirs, wellhead fittings, characterized in that the tubing columns are coaxial , fluid selection is carried out along the internal channel of the smaller diameter tubing, and injection is carried out along the annular gap between the larger and smaller diameter tubing Etra, wherein the plant is equipped with a device for separating streams injected and withdrawn fluid termobarokompensatorom valve and for muffling operation.

Description

The utility model relates to the oil industry, in particular to installations for simultaneous and separate production and injection.

State of the art

The invention is known "Device for the simultaneous separate production of borehole products and injection of water into the reservoir" (patent No. 2297521, RU, E21B 43/14, published on 04/20/2007). The specified device includes a casing perforated in the interval of the upper productive and lower receiving strata, a tubing string perforated in the interval from the flooded part of the productive stratum to the lower stratum, a packer installed in the well above the top of the receiving stratum, upper and lower (electric centrifugal) pumps , the total productivity of which is selected based on the production ability of the reservoir in liquid, and the ratio of the productivity of the upper and lower pump s are selected depending on the amount of water and oil entering the well with the condition of ensuring gravitational separation of the formation fluid into an upward flow of oil, selected by the upper pump and a downward flow of water, pumped under the packer into the receiving formation

The disadvantages of this device include the difficulty of installing the optimal performance modes of the upper and lower pumps, since the total well flow rate and the flow rate divided into oil and water components are variable, depending on time and on the properties of the oil reservoir. In addition, the fluid flow from the oil reservoir into the well is subsequently bifurcated into flows with an uncertain ratio: one flow enters the tubing, and the other moves in the well, outside the tubing, as a result of which the oil-water mixture can be trapped by the lower electric centrifugal pump followed by flow into the receiving aquifer.

The Utility Model “Installation for simultaneous and separate production and injection through one well” (patent No. 844461, RU, E21B 43/14, published July 10, 2009) is also known, comprising: a drive, a screw pump, a string of pump rods, and two parallel pumps tubing columns of various lengths for separate fluid production from the reservoir and injection of fluid into the injection reservoir, parallel two-channel anchor, wellhead fittings and packer for separation of the reservoirs.

The disadvantage of this installation is the need to use special wellhead fittings, which are not commercially available. During the descent and lifting of two parallel tubing strings in one well, due to the small distance between the strings due to the equipment design, it is possible to engage the protruding parts (couplings) of the outer surfaces of the strings during their relative movement. In addition, with a significant injectivity of the injection reservoir, a structurally small flow area of the injection string of the tubing of the installation cannot provide injection of a large amount of fluid without significant pressure loss. The absence of movable joints in the tubing string leads to significant bending deformations associated with temperature changes in the injected medium during hot flushing. Installation according to patent RU 84461 is the closest in technical essence to the claimed and adopted as a prototype.

Utility Model Essence

The technical task of the claimed utility model is to simplify the installation of the installation, to enable the injection of a large volume of fluid into the injection reservoir, as well as to increase the reliability and safety of equipment during operation and repair work at the well.

The technical result, due to which these tasks are solved, consists in the possibility of changing the relative position of the tubing strings for separate fluid production from the reservoir and pumping the fluid into the injection reservoir, as well as the possibility of using a thermocouple compensator and equipment to make jamming as part of the installation wells.

The technical result is achieved due to the fact that in a known installation for simultaneous-separate production and injection through one well, tubing strings for separate liquid production from the reservoir and liquid injection into the injection formation are coaxial. Liquid is taken from the reservoir through the internal channel of the smaller diameter tubing, and fluid is injected into the injection reservoir through the annular channel between the larger and smaller tubing. Moreover, the area of such an annular channel during coaxial descent of pipes exceeds the area of the internal channel of those tubing pipes through which the fluid is pumped, while the tubing strings are parallelly lowered, which allows pumping large volumes of fluid. Installation of equipment is carried out in two tripping operations. During the first round-trip operation, a string of tubing of larger diameter is connected to the packer, a valve for killing and a device for separating the flows of injected and withdrawn fluid. During the second round-trip operation, the pump and the tubing string of smaller diameter are lowered along the inner channel of the tubing string of larger diameter, with no protruding parts of the columns contacting. Docking of the tubing string of a smaller diameter and the device for separating the flows of injected and withdrawn liquid is done using a thermal pressure compensator.

The use of a thermocouple compensator that provides telescopic connection (on the principle of a plunger-cylinder) of smaller tubing pipes and a device for separating the flow of injected and withdrawn fluid allows you to raise and lower the pump without lifting the tubing string of a larger diameter. In addition, the telescopic connection allows you to compensate for temperature stresses arising in tubing during hot flushing and pressure stresses arising from the influence of fluid pressure in tubing, not allowing the pump and internal tubing to bend under the influence of the indicated voltages.

The presence in the composition of the installation for simultaneous-separate production and injection in one well of a valve installed between the packer and the device for separating the flows of injected and withdrawn liquid allows the operation of killing the injection reservoir. This valve is designed for tight separation and communication of the annulus and the space through which fluid is pumped into the injection reservoir. The silencing fluid supplied to the annulus fills it and through the valve enters the channel for pumping fluid into the injection reservoir. The valve is opened by creating a pressure in the annulus of the well that exceeds the pressure in the channel for pumping fluid into the injection formation.

List of drawings

In FIG. Installation for simultaneous and separate production and injection in one well is shown.

Information confirming the feasibility of implementing a utility model

Installation for simultaneous-separate production and injection in one well contains two columns of tubing larger than 1 and 2 smaller in diameter, rod string 3, sucker rod pump 4, packer 5 for separation of productive 6 and injection 7 formations, wellhead fittings, device for the separation of the flows of injected and withdrawn fluid 8, the thermocouple compensator 9 connecting the column of tubing of smaller diameter 2 and the device for separating the flows of injected and withdrawn fluid 8, a valve for jamming operations 10. Wellhead fittings, a tubing string of smaller diameter 2, a pressure compensator 9 and a device for separating the flows of injected and withdrawn fluid 8 form a channel through which fluid from the formation 6 flows to the mouth. At the same time, wellhead valves, an annular channel between the tubing strings of larger 1 and less than 2 diameters, a device for separating the flows of pumped and withdrawn fluid 8 and a valve for the operation of jamming 10 form a channel through which fluid is injected into the reservoir 7. The installation operates as follows way.

The liquid through the wellhead fittings enters the annular gap between the columns of tubing larger than 1 and less than 2 diameters and, passing through the device for separating the flows of pumped and withdrawn fluid 8 and the valve for the operation of silencing 10, is pumped into the reservoir 7. Simultaneously, the fluid formation 6 under the influence of the pressure differential created by the sucker rod pump 4, passing through the device for separating the flows of injected and withdrawn fluid 8, enters the pump-compressor column x smaller diameter pipes 2 and then enters the valve through the wellhead into a collecting manifold. Packer 5 provides a reliable separation of productive 6 and injection 7 formations. The thermo-bar compensator 9 is a tight, movable connection of the plunger in the cylinder, uncoupling the tubing string of smaller diameter 2 and a device for separating the flows of pumped and withdrawn fluid 8, which avoids significant bending deformations of the tubing string of smaller diameter 2 due to temperature changes the injected medium. After the descent, the tubing string of smaller diameter 2 is pulled up by an amount equal to the thermal and pressure elongations due to the movable connection of the plunger in the cylinder. If it is necessary to perform a silencing operation, the silencing fluid through the annulus and valve 10 is pumped into the channel through which the fluid enters the injection reservoir 7.

Claims (1)

Installation for simultaneous separate production and injection in one well, containing two columns of tubing of different diameters, a rod string, a sucker rod pump, a packer for separating productive and injection reservoirs, wellhead fittings, characterized in that the tubing columns are coaxial , fluid selection is carried out along the inner channel of the smaller diameter tubing, and injection is carried out along the annular gap between the larger and smaller diameter tubing Etra, wherein the plant is equipped with a device for separating streams of liquid injected and withdrawn, and the valve termobarokompensatorom for muffling operation.

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