SU791970A1 - Device for investigating the beds of combustible minerals - Google Patents

Description

one

The invention relates to the field of mining and is intended to study the gas-fluid saturation of rocks.

Devices are known for studying NIN formations by the method of quantitatively studying the gas-fluid saturation of a formation by sealed downhole samples of rock sludge, which involves in gas analysis of the sample after rising to the surface and measuring the pressure by means of a device that includes a housing to which a slag-15 receiving container and a rock-breaking chisel 1 are attached.

A disadvantage of the known device is the impossibility of eliminating 20 a negative factor influencing drilling mud filtrate (infiltration) on drilled rocks, leading to loss and distortion of reservoir information characterizing the object under study.

This disadvantage is partially eliminated in the device, where the sampling is performed after drilling at the time of the expiration of formation fluid. thirty

A device is known comprising a drill pipe string with a hydraulic channel, a sample container, a packer with a housing and a pressure tool, a drill bit with a rock-breaking bit, and a mechanism for creating a depression in a sub-packer zone with a controlled gate 21.

However, due to the fact that at the time of sampling there is no exposure of the new surface of the reservoir, and n {onikenie: the filtrate into the reservoir is very significant, the sample taken by the known device is also exposed to the washing fluid. In addition, this technical solution does not allow sampling of the rock at the same time.

The aim of the invention is to increase the reliability of the study by eliminating the effect of infiltration on the informativeness of rock samples.

To achieve this goal, it is equipped with a downhole bit feeding mechanism, made in the form of a section of fitting pipes, connected to the drill pipes with a movable spline joint and connected to the packer body with a supporting plate for rotation.

The achievement of the goal is also facilitated by the fact that the device is equipped

a submersible pump having driven drill pipe strings. In addition to that. The shutter is made in the form of a sleeve, which is mounted with a possibility of displacement in the packer case on the thread, which overlaps the holes in the packer case and is connected to the drill pipes by a movable spline coupling.

FIG. 1 shows the device. "General view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one.

The device assembly contains a sludge pipe 1, a distributor differential 5, a fuser 2, an intermediate shaft 3, a drive unit for a sealing valve in the form of a piston 4, a sleeve 5 and a push rod 6, an outer pipe 7 with a filter 8 forming a drill bit, 20 a also a sample container in the form of housing 9, plug 10, top cover 11, inside of which valve 12, spring 13 and rod support 14 .. .25 are mounted

The downhole feeder has a pipe section (UBT) 15, which through pipe 16 is connected to a movable connection consisting of a 2Q splined nipple 17, an eyebolt coupling 18 and a sub 19.

The reference point, including the housing 20, the cover 21, the shaft 22, the stuffing box 23 and the bearings 24, 25, provides freedom of rotation. To create a bottomhole circulation in the device, there is a submersible pump that includes a valve block consisting of a sub 26, a suction 27 and a discharge 28 valves, 0 a housing 29 with working fingers 30 embedded in it, an anvil ring 31, a piston cam 32, on the outside which has a groove made in the form of a sinusoid, a hollow 45 rod 33 s. two longitudinal grooves and closed at the top by a stopper 34, as well as working fingers 35, by means of which Parts 32 and 33 are connected.

The packer of the device is fixed on the core-JQ bus 36, in the longitudinal grooves of which axes 37 fortified spacers-holders 38 are fastened. The pressure packer contains a branch pipe 39 with the oil-filled rubber-fabric cuff 40 installed in its middle part, slotted coupling 42, articulated by slots with overlapping arm 43, central drill pipe 44, slotted shank 45, articulated with slots 60 with a slotted nozzle 46, adapter 47 to the drill string — guide pipe 48 and thrust bearing 49, through which azobschaets fixed at 65 bure-

SRI node packer system from a rotating pipe 44.

The device works as follows.

Before the device is lowered into the well, it is necessary to fill the sealed container and the tube cavity up to tube 34 with a neutral salt solution

The device is lowered into the well on the unfilled drilling mud string of drill pipe and installed on the bottom. When this occurs, the splined coupling 1B is moved to the lower end of the adapter 19 until it stops. The possibility of penetration of the flushing fluid inside the drill pipe string while lowering the device is eliminated due to the plug 34 installed in the upper part of the hollow rod 33.

After installing the tool, the bottom hole is insulated into the wellbore zone. For this, the load from the drill pipe string is transferred to the rubber-fabric cuff 40 through the adapter 47 and the splined nozzle 46 to the upper thrust ring of the packer 41 and simultaneously to the bearing 49 and the pressure nozzle 39. When moving down the nozzle 39 due to the force transmitted through its ends the shaft of the undercut to the protrusions of the holding plates 38, they are rotated around the axes 37 and inserted into the walls of the well, thereby achieving fixation of the static position of the device in the well, and the thrust projections in the housing 36 through the holding plates 38 perceive t oso.vuyu load transmitted by the drill string.

At the end of the packing operation, the bottomhole zone of the well bore is connected to the atmosphere with the packing area. For this, the drill pipe string is rotated, and together with it the spline sleeve 42 connected to the overlapping sleeve 43, feeding it down along the thread, as a result of which openings in the lower part of the packer case 36 are opened. Turned out of the housing 36, the sleeve 43 sits on the thrust coyco 31.

Thus, through the open holes in the packer body 36, the bottomhole zone of the skg.in communicates with the unfilled hole solution of the cavity of the drill pipe string. As a result, in the near-wellbore zone, the pressure decreases to a value corresponding to the reservoir, and the packer is additionally compacted, and the filtrate that flows into the reservoir flushes the fluid upward and is replaced by the reservoir gas-fluid mixture.

After the formation pressure is established, the reservoir under investigation (production horizon) is opened and drilled.

The axial load is created by the weight of the UBT. The moment of rotation is transmitted from the drill string through the sub 47, the splined nozzle 46, the splined shank 45, the central pipe 44 and the hollow rod 33 interconnected by the coupling 42, then through the part 22, the splined joint and the UBT to the intermediate shaft 3 , distribution diffuser 2 and outer tube 7, i.e. on rock-breaking chisel.

At the same time, the boom 33, when rotated, transmits a rotational moment through the fingers 35 to the piston cam 32. Since the pump casing 29 is stationary (held from rotation and axial movement by the dies 38), the working fingers 30 built into it allow the piston cam to move along 32 and cause it to reciprocate along the hollow rod 33. When the piston cam 32 moves upward, the formation fluid flows through the valve 27 and the pump cylinder is sucked in down - via valve 28 - injecting washing fluid (reservoir fluid) in the internal cavity of the drill collars. At the same time, the flushing fluid through the radial holes in the hollow rod 33 enters the axial channel formed by parts 22, 19, 17, 18, 16, 15 and 3, acts on the piston 4, moves it down to the stop along with the valve 12 and simultaneously opens the flushing window in the sleeve 5. Next, the flow enters through the annular gap between the outer pipe 7 and the housing 9 to the bottom of the well.

The sludge formed during drilling is carried out with the upstream flux, the sludge pipe 1 is captured, passes through the distribution diffuser 2, the opening in the top cover 11 and settles in the sludge receiving container.

After the penetration of the established flight, the rotation of the drill string is stopped, and, consequently, the supply of injecting fluid to the bottom of the well is stopped. In this case, the piston 4 and valve 12 cease to act on the pressure differential, as a result of which the spring 13 returns the latter to the extreme upper position and seals it. slurry sample taken under reservoir conditions.

Then, unloading and wasps are carried out and the packer is driven. For this purpose, the flushing-fluid pumping pump is pumped to the bottom of the well. At the same time, the solution flows through the holes in the slotted coupling 42 and the housing 36 under the packer, as a result of which the hydrostatic pressure acting on the packer from above and below is balanced. After

This is done by lifting the drill string and removing the drill tool with the device to the surface.

As the device rises, the drilling fluid flows out of the drill string into the well through the radial holes in parts 42 and 36, which act as a drainage device.

0

On the surface, the sludge receiving chamber (container) with hermetically sealed sample is disconnected from the device, the value of the reservoir is measured.

pressure in the container, after which

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the sample is sent for laboratory processing.

The application of the invention eliminates the effect of infiltration on the information content of slurry samples by gas-fluid, bacterial and other factors, which allows to establish the true (natural) gas-fluid saturation of the reservoir and calculate the gas and oil reserves by the direct volumetric method.

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Claims (3)

1. Device for exploration of the layers of combustible minerals, containing a string of drill pipes with a hydraulic channel, a probe receiving 0 container, packer with body and pressure tool, drill bit with rock-breaking bit and mechanism for creating depressions in a subpacker zone C, a controlled thief, characterized in that, in order to increase the reliability of research by eliminating the effect of infiltration on the informativeness of rock samples, it 0 is equipped with a downhole bit feeder, made in the form of a section of the desired pipe, of sv. a movable spline joint with a drill pipe, and a supporting heel rotatably with the packer body, five 2. The device according to claim 1, characterized by the fact that, for the purpose of creating a wellbore fluid circulation, it is equipped with a submersible pump driven by a drill string, 0 pipes. 3. The device according to claim 1, which is the fact that the shutter is made in the form of a sleeve installed in the packer housing and connected with movable g: 1 face connection with the drill pipes. - Sources of information taken into account in the examination 1. Ngodkin V.V. and others. Depth 0 hermetic samplers and their application. Review, Series XI, VIEMS. M., 1974, p. 51, fig. 17 2. USSR author's certificate number 583288, cl. E 21 V 49/00, 1977 5 (prototype). t1