RU2370638C1 - Facility for secondary exposing of producing bed - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: facility of secondary exposing of producing bed consists of assembly of perforator and downhole tool. The downhole tool consists of cylinder protective case 2 pressure tight covered on top with tool head 1 attached to the end of a logging cable, while from below the case is ended with crossover 3 for connection with tool head 1 of the perforator. Also sensors of temperature 4, of pressure 5, locator of couplings 10, and printed circuit boards 9 with electron circuit of sensors 8 signal collection, processing and transmitting to surface in digital code for recording are installed in the downhole tool. Additionally the facility consists of sensor of natural gamma-activity 11. Notably, internal cavity of case 2 comprising sensors and printed circuit boards is made in form of rigid thin wall container 6 secured on the case of the tool on rubber shock absorbers 7. Block of natural gamma-activity sensor 11 contains crystal detector of gamma-quantum 12, photo-electric multiplier 13 and electronic circuit on printed circuit board 14; the block is assembled inside rigid thin wall container 6 on additional shock absorbers: on axial spring one 15 and radial rubber one 16. Electron printed circuit boards are installed in trough-shaped radiators and poured with dielectric compound.

EFFECT: upgraded accuracy of referencing of producing interval to geo-physical section; reduction of general time for complex of operations, reduced wear of logging cable, reduced discrepancy between project and actual value of interval exposure depth; enhanced accuracy of selecting exposed interval with temperature channel.

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Description

The invention relates to the oil and gas industry and, in particular, to devices used in the opening of reservoirs.

A device for controlling the parameters of a productive formation is known as a DINA-K4 binding module (GAZPROMGEOFIZIKA OJSC, TsENTRGAZGEOFIZIKA research and production branch, Product Catalog, DINA-K4 Tethering Module). The device is a cylindrical protective casing, hermetically sealed on top with an instrument head attached to the tip of the geophysical cable and providing mechanical fastening to the cable and electrical connection of the downhole tool with the surface, and a conical plug at the bottom. Sensors of natural gamma activity, temperature, pressure and a coupling locator are installed in the downhole tool, as well as electronic circuitry for collecting sensor signals, processing them and outputting them to the surface in a digital code for registration made on printed circuit boards.

The disadvantage of this device is the lack of impact strength of the sensor of natural gamma activity, locator couplings and printed circuit boards during punching.

A device is known for perforating and treating a bottomhole zone of a well (RU 2162514, E21B 43/117, 43/18, 43/26), which includes a hollow body with plugged holes, cumulative charges placed therein and a device for their actuation. In addition, it is equipped with temperature and pressure sensors, and to determine the location of the device in the well, a coupling locator.

The disadvantages of this device include the lack of a GK sensor in it, which forces the use of another device containing a GK channel for two additional descents into the well: to assess the location of the reservoir relative to the geological section - before perforation, to highlight the position of the interval opened by the perforator - after perforation.

The objective of the invention is to remedy these disadvantages, namely:

1) improving the accuracy of linking the productive interval to the geological section,

2) reduction of the total time spent on the implementation of the complex of works on the secondary opening of the reservoir,

3) reduction of wear of the geophysical cable,

4) reduction of the error between the design and the actual value of the depth of the opened interval,

5) improving the accuracy of the allocation of the opened interval by the temperature channel.

The technical result is achieved by the fact that the known device, consisting of an assembly of a perforator and a downhole tool, comprising a cylindrical guard, hermetically closed at the top with an instrument head attached to the tip of the geophysical cable and ending at the bottom with a transition bridge for connection with the instrument head of a perforator, and in the downhole tool temperature, pressure sensors and a locator of couplings, as well as printed circuit boards with an electronic circuit for collecting sensor signals, their processing and delivery on a the identity in the digital registration code according to the invention further comprises a sensor of natural gamma activity, while the internal cavity of the casing, in which the sensors and printed circuit boards are located, is made in the form of a rigid thin-walled container mounted on rubber shock absorbers, a sensor unit of natural gamma activity, containing a crystalline gamma-ray detector, a photoelectronic multiplier, and an electronic circuit on a printed circuit board, mounted inside an additional thin-walled container for additional amortization Congestion: axial - and radial spring - rubber and electronic boards installed in the trough radiators and filled with a dielectric compound.

The invention is illustrated by the drawing, where the downhole tool contains a tool head 1, a guard 2 and an adapter bridge to the perforator 3. Shock-proof sensors are installed in the device: temperature 4 and pressure 5. A hard thin-walled container 6 is placed inside the guard 2, resting on the tool head 1 and transition bridge 3 to the punch using rubber shock absorbers 7. Inside the rigid thin-walled container 6 there is an electronics radiator block 8 with printed circuit boards 9 filled with a dielectric compound, a coupling locator 10 and a block the sensor of natural gamma activity 11, containing a crystalline gamma-ray detector 12, a photomultiplier tube 13 and a printed circuit board 14 having additional cushioning: axial with a spring 15 and radial with rubber dampers 16.

The device operates as follows. Before the descent into the well, the perforator is charged — charges and the device for their initiation are installed in it, the electric circuit that ensures the operation of the perforator is brought to the instrument head of the perforator. Then the perforator is connected to the downhole tool via a bridge 3 and lowered into the well. During the descent of the assembly of the downhole tool and the perforator, the readings of temperature and pressure sensors from the mouth to the perforation interval are recorded. Then, in the specified interval, the values of the natural gamma activity and the locator of the couplings are recorded, the position of the perforator relative to the productive formation is corrected by them, and its perforation is performed. After perforation, the perforation interval is recorded with a complete set of sensors. The assembly is removed from the well to the surface and the completeness of the punch operation is checked by external inspection, the quality of the opening of the reservoir is assessed by the records obtained.

The impacts of shocks that occur during punching are suppressed in the downhole tool as follows: the couplings locator 10 and the printed circuit boards 9 with electronic components are shock-absorbed by the rubber shock absorbers 7 of the rigid thin-walled container 6, shock accelerations on the electronic components are further reduced due to their immersion in the dielectric compound. The most sensitive to shock block of the sensor of natural gamma activity 11 experiences acceleration, weakened by a spring shock absorber 6, from radial shocks it is protected by rubber shock absorbers 12.

Claims (1)

The device for the secondary opening of the reservoir, consisting of an assembly of a perforator and a downhole tool containing a cylindrical guard, hermetically sealed at the top with an instrument head attached to the tip of the geophysical cable, and ending at the bottom with a transition bridge for connection with the instrument head of a perforator, and temperature sensors are installed in the downhole tool , pressure and locator couplings, as well as printed circuit boards with an electronic circuit for collecting sensor signals, their processing and output to the surface in qi A registration code, characterized in that it additionally contains a sensor of natural gamma activity, while the internal cavity of the casing, in which the sensors and printed circuit boards are located, is made in the form of a rigid thin-walled container mounted on the device body with rubber shock absorbers, a natural gamma sensor unit -activity, containing a crystalline gamma-ray detector, a photoelectric multiplier and an electronic circuit on a printed circuit board, mounted inside an additional thin-walled container shock absorbers: axial - spring and radial - rubber, and electronic boards are installed in trough-shaped radiators and filled with a dielectric compound.