SU684133A1 - Formation tester on logging cable - Google Patents

Description

(54) PLASTERS IN CASTE CABLE

one

The invention relates to geophysical methods for the investigation of oil, gas and hydrogeological wells, namely, devices for sampling formation fluid.

A reservoir testing device is known which, after contact with a potentially productive formation, injects formation fluid into a pipeline and then discharges it through a filter into the formation. The filter is cleaned, then the strain is applied to the reservoir and sample 1 is taken.

Odaako sealing unit is also inapplicable at cavernous intervals, and when extruded from the filter, it becomes clogged with clay particles.

The closest solution known is a device for sampling formation fluid, running on a logging cable, providing sampling, sealing and lifting to the surface, having hydraulic motor electric packers and two pumps connected to the different ends of the engine shaft, one of the pump channels It is connected to interpacker space and to the external environment, and the second is

with a container filled with oil and a packer cavity 2.

However, in this tester, both pumps are turned on together, as a result of which the packer installation operation is carried out simultaneously with the pumping of fluid from the inter-packer space through the samplers. Therefore, the depression on the reservoir increases slowly and does not ensure the cleaning of the wellbore zone of the reservoir and the challenge of inflow. In addition, the injection of fluid into the packers in TeifeHHe the entire time of testing leads to an overestimation of power consumption. Therefore, such a design often does not provide a solution to the main problems of testing.

The aim of the invention is to reduce power consumption and increase device efficiency.

Claims (2)

For this, the differential piston is provided with a rod with a conical thickening and a collar in the upper part, placed inside the pusher of the valve of the packers, and a stopper in the lower part connected by the rod with the piston No. 1, placed in the cylinder, connected with the sanal to the pusher of the intake valve of the sampler, the pusher the packer check valve is a collet with spring-loaded petals; pressed to the differential piston rod. Such an implementation of the tester allows first to pump out the fluid from the inter-packer space, and then communicate it with the formation, i.e. impact on the formation is fast. , FIG. Figure 1 shows the initial positing mechanisms of the instrument. FIG. 2 shows the position of the mechanisms at the time of actuation of the valve drive. : The proposed tester contains packages 1, the internal cavities 2 of which are connected by a channel 3 with a reversing pump installed in the upper part of the tester and equipped with a shut-off valve 4 with differential piston S with an axial channel b The piston 5 is provided with a rod 7 with a conical thickening in the upper part and a collar placed inside the collet - pusher 8 and in the lower part npo6i (oH 9 connected by a rod 10 with porhish 11 placed in the cylinder 12. The inlet valve pusher 13 is a piston with a lip seal, Cavity A above the upper end of the differential piston 5 communicates with a reversible pump, and the cavity B under the lower end connects with the bore.The housing has a bore forming a cavity that serves to communicate channel 6 through the channel and check valve 14 with interpacker space, sampling chamber. Predagayemy tester works as follows. In the initial position, the tester is lowered by the sampling interval. In so doing, the differential piston 5 is in the lower position. The piston 11 is located in the lower bore of the cylinder 12. The pressure in all the channels and cavities (except for the sampler) is equal to the hydrostatic pressure of the wellbore column. Using a reversible pump, well fluid is pumped into the cavity of the packers 1 until the test interval is completely sealed. The pump then switches to pumping fluid from the inter-packer space. At the same time, the pressure in cavity A decreases and, under the action of the difference in pressure, the differential piston 5 moves upward, pushing its push-in collar 8 with its upper end to the extreme upper position. At the same time, the collet-pusher petals freely pass by the check valve 4. The plug 9 exits into the point 15, and the channel communicates through the check valve 19 with the interpacker space. The pumping out of the interpacker space occurs. When this is removed, the pump reverses, and the well fluid is pumped into cavity A. As the check valve 14 does not pass the liquid into the interpacker space, an increase in pressure begins in cavity A, under pressure the action of which the differential piston 5 moves down. In this case, the pusher-pusher 8 is held by the force of the friction of the sealing ring 16 in the housing, and its petals are pushed apart by a conical thickening of the clamp and after moving to the collar 17, the collet also begins to move downwards. The piston 11 emerges from the upper groove of the cylinder 12 and, by increasing the pressure above the pusher 13 of the intake valve, opens the latter. Sampling occurs in the sample chamber, the pump stops. After filling, the pump is reconnected, and the differential piston 5, moving downward, leads the piston 12 to the lower bore of the cylinder 12. The inlet valve closes. At this time, the petals of the pusher collet 8, moving past the locking 4 packers, open it, the pressure from the packers is released into the wellbore, and returned to the original. postazhie under the action of elastic forces. Tester can be lifted to the surface. In this design, the separator separates the installation of the packer installation, pumping out fluid from the packer space and taking a sample into the balloon makes it possible to double affect the reservoir with a sharply increasing depression of various sizes, which creates better conditions for cleaning the near-well zone of the reservoir and taking the formation fluids without impurities well fluid. Claims 1. A logger on a logging log, comprising a housing, hydraulic packers with a shut-off valve, a sampling box with an inlet valve, a reversing pump, and in case of water valves in the form of a hollow differential piston, in order to reduce the consumption of moistivity and increase efficiency the device, the differential piston is equipped with a rod with a conical thickening and a collar in the upper part, placed inside the pushrod valve of the packers, and a stopper in the lower part connected by a rod with the piston m, a softening schennym cylinder-bonded communication channel with inlet valve plunger probosbornika. 2. The tester according to claim 1, I distinguish | W and also the fact that the pusher of the locking valve 684133 Pan Packer is a collet with pru-1. US patent number 3813936, CL. 73-155. vinous petals pressed to the rod1974. differential "orshn .2. OPD-2 reservoir tester (Yu Catalog) Information sources taken into account during the examination Nyy sheet, ENEA. ed. Advertising, Kiev, 5 1971 (prototype). ///// l u