SU604980A1 - Equalizing device for seam tester - Google Patents

Description

one

This invention relates to a technique for testing oil wells, in particular to the structures of a balancing device used in reservoir testers for selective horizon testing.

Nowadays, for testing formations in drilling wells, a wide variety of test tooling on drill pipes with two packers using a balancing device is widely used.

A leveling device is known, which includes a tube placed inside a filter installed between two packers. The tube passes through the radial channels in the subs above the upper packer and under the lower packer and is permanently connected to the annulus. The length of this tube depends on the length of the filter part placed between the packers, which creates considerable inconvenience in the operation of this device.

Another leveling device for the formation tester is known, consisting of a lower sub, a body rigidly connected to it with channels, placed in a body of a rod with slots connected to the upper sub, and seals.

A disadvantage of this device is that, during selective testing, it becomes inoperative, since during the packer operation the lower part of the subpacker zone, below the lower packer, communicates with the interpacker and inner tube space.

In addition, during increased gaps when removing the packer or even sticking the shank, the duration of the full test cycle is limited and limits the issue of complete information about the hydrodynamic parameters of the formation. The known device lacks the ability to release stuck parts, such as a shank. The aim of the invention is to increase

the reliability of the phonetic device irn using it in a two-pack layout tester layers.

The goal is achieved by the fact that the rod of the balancing device is made with channels

over which is installed a stub.

Tsa FIG. 1 shows the device in the working extended state when the tester is descending at a given interval, general view; in fig. 2 - device in compressed state

when packing the upper and lower packers and separating the lower subpacker part of the formation from the interpacker and intrapacker floor of the drill pipe, general view; in fig. 3 shows the device with the arrow designation of the motion: liquid during descent

reservoir tester; in fig. 4 shows a device with a designation of the movement of fluid from under the lower packer when the channels are blocked.

The device consists of a lower sub 1, a body 2 rigidly connected with it with channels 3 and 4, housed in a stem 5 with slots connected to the upper sub 6, and seals 7. The stem 5 is made with channels 8 over which a plug is installed 9, Yush section; and the stem cavity into two independent hermetic cavities. The lower part of the stem 5 is smaller in diameter than the upper part, and with the body 2 when the device is in the extended position, it forms a chamber filled with a borehole fluid. Between the housing 2 and the stem 5 there is a rubber cuff 10. The channels 3 and 4 are made in the form of holes in the upper and lower parts of the housing 2.

During operation, the leveling device is positioned above the lower packer. During the descent of the reservoir on the drill pipe at a predetermined test interval, the well fluid passes through the holes in the sub under the lower packer. Next, the fluid passes through the cavity of the lac stem, through the cavity of the lower part of the stem 5, through the channels 8 and the channels 4 in the lower part of the housing 2. At the same time, the liquid passes between the packers and the borehole wall.

When packaged, the rod 5 is driven by the weight of the drilling tool, and the lower part of the rod 5 with the channels 8 enters the seal 7, thereby stopping the movement of the well fluid from under the packer space of the lower packer through the rod. This occurs at the end of the packer of the lower and upper packers.

In this operation of the sealing device, the substaker hydroresistance is removed, the packer passability in the wellbore is improved, the same working and load conditions are provided for both

the packers are eliminated the possibility of transferring the depression to the well interval located below the lower packer. At the end of the test, the removal of the packers from the place is usually accompanied by very significant puffs. In addition, when standing in an open hole, the danger of sticking of test equipment or blockage is not excluded. parts of its precipitated rock. In order to avoid this, the balancing device, due to the described stem design, is able to move upward under the tension of the drilling tool, while the accumulated elastic energy of the column passes into

kinetic energy of impact. The column is quickly reduced, and the slotted protrusions of the rod 5 strike the corresponding slotted projections of the balancing device. The beat is transmitted to the packer and shank. If a

freeing the downstream assemblies from the first strike fails, then repeatedly lower and pull the drilling tool.

The use of the proposed leveling device in a two-pack arrangement makes it possible to eliminate the sticking of the test tool kit on the drill pipe when the tool is being lowered and ascended, and the pistoning of the fluid by the lower packer makes it easier to remove. As a result, downtime is reduced, associated with conducting interval tests.

Claims (1)

Invention Formula An equalization device for the formation tester, consisting of a lower sub, a rigidly connected body with channels, placed in a body of a slotted slot connected to the upper sub, and Seals, characterized in that, in order to increase the reliability of its work in the two-packer tester layout, the rod is made with channels, over which a plug is installed. 0 liOJ. tpuz.i | R d i il Fig a Phage