SU35783A1 - Instrument for testing formations in oil and slot wells - Google Patents

Description

Until now, the testing of oil and gas horizons in boreholes was carried out only after the water reservoirs were closed, which is usually carried out using 1) cement tamping, for example, using the Perkins method, which results in loss of the water-tight column, impermeable for water, rock, for example, into clay, which is also often accompanied by loss of a string of pipes or 3) with the help of various glands, which usually do not reach the goal.

In his proposal, the inventor aims to test the oil and gas horizons, which do not produce a costly and time-consuming cement. Using the proposed device, formation testing is carried out without the use of casing, which reduces the cost and simplifies drilling, making it possible during structural drilling to simultaneously test all the horizons encountered by the well.

In the schematic drawing of FIG. 1 shows a longitudinal section of the device; FIG. 2-bottom view of the device; FIG. 3- cross section along ab line.

The proposed device consists of an outer pipe /, on its side surface provided with holes 2.

(32)

A sleeve 3 is inserted into the tube 1 from above and fastened to it on cutting and screws, and a sleeve 4 from below. The sleeves 3 and 4 are provided with screw holes in the center, into which the tube 5 is screwed into four holes (possible and larger) opposite the sleeves 3 b and 7, and a total of eight, and the area of the holes should be approximately equal to the area of pipe 5. On top of the pipe / sleeve 9 of rubber or rubberized fabric is put on, tightly attached with screws to sleeves 3 vi 4 (or fastened with sleeves 3 vi 4 with steel soft wire or otherwise), to the bottom The sleeve 13 is screwed on the tube 13, which is provided with holes 14 along its entire length, the length of which is equal to the thickness of the formation under test. A tube L is screwed into tube J3 in the form of a cross bit or other shape so that it can be plunged into the face to prevent the entire device from turning around the vertical axis during subsequent manipulations while working with it. The upper sleeve 3 is provided with channels 15 and 16, and the channel 16 connects when the holes 7 coincide with it the pipe 5 with the annular space 8 between the pipe 5 and the pipe 1, and the channel 15 connects the space of hollow rods when the holes 6 coincide with it

with the upper part of the well lying above the sleeve 5. The bottom of the pipe 5 is screwed into the bottom of the 18, which does not allow water to pass into the pipe 5 and is connected to the latter with the help of two sectors that enter the corresponding recesses of the pipe 5.

The instrument is assembled as follows. Inserts Zn4 are inserted into the perforated tube 7, which are fastened together with their cutting or with the help of screws. A pipe 5 is screwed into the sleeves, carrying threads at both ends (pipe 5 is better to be made of bronze) with a corresponding length between which there is a recess throughout its length. A threaded pipe 13 is threaded to the lower bushing 4 (or fastened to the bushing with screws). When the device is assembled, the screwed-in pipe 5 is installed so that its opening b coincides with the horizontal ducts / 5 of the sleeve 3; over the pipe / put on the rubber pipe 9, tying it in several places with a thin and weak flail so that the rubber sleeve 9 does not hit the walls of the well when the device is lowered. On this object it is even better to connect the perforated pipe / with rubber pipe 9 with some number of weak springs that press pipe 9 tightly to pipe 7. When the device is assembled, proceed to lowering it through pipe 5, and its lowering must be done carefully to prevent the pipe 5 from turning sleeves 5 and. The device is as follows. After the device is lowered, the well is washed with a mud. It is pumped through the pipe 5, and the solution goes through 3 bore through hole b and duct 75. Then, rotating the pipe 5, align the hole 7 with the flow path 16, as a result of which the sleeve 9 (rubber or rubberized material) expands and presses against the borehole wall. In this way, the aquifer is isolated from the gas or oil reservoir. Rotating farther away the pipe 5, screw it into the sleeves J and until the channel 16 closes and the lower bottom 18 drops out of the sleeve 4. The result of this will be the isolation of the aquifer from the gas (oil) and also the connection of the pipe 5 with the borehole space opposite the pipe 13, provided with holes 14. After that, it is possible to start testing a gas or oil reservoir, for which water is pumped out of the pipe 5 by means of a piston or a yoke, looking at the diameter of pipe 5 and, if oil and gas then the latter will start pass through pipe 5; If the plastic is not productive, then it is very easy to remove the device with the pipe from the well. For this purpose, the pipe is rotated until the holes 7 are below the sleeve 3. As a result, the space of the pipe 9 is connected to the pipe 5, and the rubber pipe 9 under the influence of the springs is pressed to the pipe 7; the instrument is released and can be removed from the well.

The subject matter of the invention.

Claims (2)

1. A device for sampling formations in oil and gas wells, equipped with a rubber seal, pressed against the walls of the well by the force of a pressurized fluid, characterized in that it consists of holes 2, blocked by a rubber sleeve 9, a tube / with two threaded sleeves 5 and 4, into which pipe 5, having holes b and 7, is screwed in, during rotation of which pipe 5 successively occurs: 1) alignment of openings 7 with channels 76 for flushing the well, 2) combining openings 7 with channels 16 for passing water into space 5, for extended Yeni sleeves 9, 3) locking the channels 16 to close the space 8 after expanding the sleeve 9 and simultaneously unscrewing the bottom 18 of the sleeve 4 and 4) opening the space 8 when lowering the holes 7 of the pipe 5 below the sleeve 3 after testing the well. 2. In the device according to claim 1, use a pipe 14 provided with holes 13 and screwed into the sleeve 4 and have an end at the end of the cross bit A for immersion in the face in order to prevent the device from turning when the pipe 5 rotates.