RU2436934C1 - Installation for simultaneous separate water pumping into reservoirs - Google Patents

Abstract

FIELD: gas and oil production.

SUBSTANCE: installation consists of production tubing with packers dividing reservoirs and with couplings with axial and radial channels and of removable plug. The removable plug is lowered from a wellhead on a rod and pressure tightly interacts with axial channels of the couplings. The installation has lengthwise channels communicating spaces above and under each starting clutch. The removable plug is complex and consists of plungers connected with rods and interacting with axial channels of the couplings corresponding to them. The plungers are constantly located in the well. The lengthwise channels are made in each plunger, while couplings are made in form of polished bushes with radial orifices. Also, length of rods, bushes of couplings and plungers as well, as their number and orifices in the bushes of the couplings are chosen to facilitate selective shutting of radial channels with the plungers in corresponding bushes of the couplings without extraction of the plug to surface.

EFFECT: raised efficiency of measurement and control of volume of water pumped into reservoirs both simultaneously and separately.

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Description

The invention relates to the oil and gas industry, in particular to a system for maintaining reservoir pressure.

A well installation is known comprising a well with at least one pipe string with constant or variable diameter without or with a plugged end, with at least one hydraulic and / or mechanical packer lowered below the upper formation without or with a pipe disconnector. Below and above the packer, at least one landing assembly in the form of a borehole chamber or a nipple with a removable valve and a fitting for supplying a working agent through them to the lower and upper layers, respectively, was lowered (RF patent No. 2253009, ЕВВ 43/14, published May 27 .2005).

The disadvantage of this installation is the complexity of the technology for regulating injection volumes, which requires the extraction of one or more removable valves with a fitting using cable technology and replacing them with others with a different capacity. It is also difficult to measure the performance of removable valves in downhole conditions.

The closest in technical essence to the proposed is the installation (RF patent No. 2084625, ЕВВ 49/00, ЕВВ 43/14, published July 20, 1997), which is located in a well with layers separated by packers, and contains a column of elevator pipes with launchers couplings having axial, longitudinal and radial channels. The installation allows one of the layers to be disconnected from the injection by launching plugs of an appropriate size on the rope.

The disadvantage of this installation is the need to lower and raise plugs of various sizes to shut off different layers.

The technical problem solved by the installation is to simplify the control and regulation of the volume of water injection into the reservoirs.

This problem is solved by the proposed installation for simultaneous and separate injection of water into the strata, including a column of elevator pipes with packers separating the strata and couplings with axial and radial channels, and a removable stopper, lowered from the mouth and made with the possibility of tight interaction with the axial channels of the couplings the installation contains longitudinal channels communicating spaces above and below each starting clutch.

New is that the removable plug is made of a team consisting of plungers connected by rods and interacting with the corresponding axial channels of the couplings, and is constantly located in the well, longitudinal channels are made in each plunger, and the couplings are made in the form of polished bushings with radial holes, the length of the rods, bushings of the couplings and plungers, as well as the number of them and the holes in the bushings of the couplings are selected with the possibility of selective overlapping by the plungers of radial channels in the corresponding bushings of the couplings without lifting the plug and the surface.

The essence of the invention lies in the fact that the water from the elevator column flows to the layers, separated by packers, through the holes in the bushings with a polished inner surface, interacting with a set of plungers placed on a rod, rope or any other traction body. The plungers are placed on the traction body in such a way that by moving the traction body at the mouth it is possible to ensure the operation of any layer or any combination of layers separately. To ensure this, the number of plungers, sleeve sleeves and radial holes may not coincide with the number of layers.

In Fig.1 shows a diagram of the installation for example, when three layers are open.

In Fig.2 shows a diagram of the installation on the example when only one layer is open - the bottom.

Figure 3 shows the operation diagram of the installation by the example when only one layer is open - the top one.

The installation contains a well 1 (see Fig. 1) with three layers: upper 2, middle 3 and lower 4, into which a column of elevator pipes 5 with packers 6 and 7, dividing the well into three cavities is lowered: upper 8, in communication with the upper layer 2, middle 9, connected with the middle layer 3, and lower 10, communicated with the lower layer 4. In the column of elevator pipes 5 there are bushings 11, 12 and 13 with radial holes 14, 15, 16 and 17 communicating the inner cavity 18 of the elevator pipes 5 with upper 8, middle 9 and lower 10 cavities, respectively. Inside the elevator pipes 5, a rod 19 (a rope or other traction unit) is placed, on which plungers 20, 21, 22 and 23 with longitudinal channels 24 are installed and connected by rods 25, 26 and 27. The column of elevator pipes 5 is closed by a plug 28 at the bottom.

The installation works as follows.

The main tasks during simultaneous injection into formations 2, 3 and 4 are the control and regulation of injection volumes into each of formations 2, 3 or 4, which are determined by oil field development projects. In addition, an important criterion is the response of production wells to water injection - sometimes they stop the water injection into formations 2, 3 or 4, if the water cut in reservoirs 2, 3 or 4 increases sharply in production wells.

Thus, the installation should allow how to measure the injection volumes for each layer 2, 3 or 4, and, if necessary, allow to turn off any or any of the two involved layers 2, 3 or 4.

So, for example, according to preliminary technological research results (pressures and volumes of injection, formation characteristics, the need to pump into one or another formation 2, 3, 4) by practical selection in the conditions of workshops or at the wellhead, the design of the installation is determined, the length of the rods 25, 26, 27, sleeve couplings 11, 12, 13 and plungers 20, 21, 22, 23, as well as the number of them and the holes in the sleeve of the couplings, depending on the number of layers and the switching options necessary for their operation. According to the selection results, it was necessary to use three bushings of couplings 11, 12 and 13, four plungers 20, 21, 22 and 23 of different lengths with longitudinal channels 24, rods 25, 26 and 27 of different lengths, the use of four holes 14, 15, 16 and 17 in the sleeve of the couplings 11, 12 and 13, with two holes 14 and 15 in the sleeve of the sleeve 11. Next, the installation is assembled and lowered into the well 1. In our example, according to the preliminary technological results of the research, it is necessary to first inject all three layers 2, 3 , and 4, then inject only into the lower layer 4 (Fig. 2), and in Lednov embodiment - only in the upper layer 2 (Figure 3).

Water from the water conduit (not shown in Fig.) Enters the column of elevator pipes 5 (Fig. 1), then through the longitudinal channels 24 in each plunger 20, 21, 22 and 23 along its entire length. Then, through the radial holes 14, 15, 16, and 17 in the bushings 11, 12, and 13, water enters the cavities 8, 9, and 10, and from them into the seams 2, 3, and 4. At the same time, at the mouth (not shown in Fig.) wells 1 measure pressure and total water injection.

To determine the injectivity of any of the layers 2, 3, 4 by moving the rod 19 at the wellhead (not shown in Fig.), The plungers 20, 21, 22 and 23 are moved to such a position that the radial holes 14, 15, 16 or 17 in only one sleeve 11, 12 or 13.

Figure 2 shows the position of the plungers 20, 21, 22, 23, when the holes 14, 15 and 16 in the bushings 11 and 12 are blocked by the plungers 20 and 21, and the hole 17 in the sleeve 13 is not blocked. Water through the hole 17 and the cavity 10 enters the lower layer 4, i.e. a flowmeter at the mouth (not shown in FIG.) measures only its productivity.

Figure 3 shows the position of the plungers 20, 21, 22 and 23 when the radial holes 16 and 17 in the sleeves 12 and 13 are blocked. The injected water through the holes 14 and 15 enters through the cavity 8 into the upper layer, and the flow meter at the wellhead measures it performance.

The productivity of the middle layer 3 is determined either by subtracting the productivity of the layers 2 and 4 from the total, or by installing the plungers 20, 21, 22 and 23 in a position that ensures the operation of only the middle layer 3.

Further, the installation can work with any necessary combination of working layers 2, 3 and 4, taking into account the volumes of injected water.

Thus, the proposed installation simplifies the design and allows for simultaneous and separate injection of water into several layers, as well as measuring and adjusting the volumes of its injection through the layers.

Claims (1)

Installation for simultaneous and separate injection of water into the strata, including a column of elevator pipes with packers separating the strata and couplings with axial and radial channels, and a removable stopper that is lowered from the mouth on the traction and made with the possibility of tight interaction with the axial channels of the couplings the installation contains longitudinal channels communicating spaces above and below each starting clutch, characterized in that the removable plug is made of a team consisting of plungers connected by rods and interacting with the corresponding axial channels of the couplings, and is constantly located in the well, longitudinal channels are made in each plunger, and the couplings are made in the form of polished bushings with radial holes, and the length of the rods, bushings of the couplings and plungers, as well as the number of them and the holes in the bushings of the couplings are selected with the possibility selective overlapping of the radial channels by the plungers in the respective sleeve of the couplings without lifting the plug to the surface.

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