TH23581B - Methods and systems for detecting the unique characteristics of basements in wells. - Google Patents

Abstract

The DC60 system will be provided for the exclusive inspection of the basement in which the well has been formed, with a fitting that has been attached to the well with a cement layer between the fitting and the hole wall. That channel Special characteristics mentioned above Can be transmitted via At least part of the thickness of the cement layer The system consists of at least a sensor. One piece for the aforementioned special effects measurements Each receptor is attached to the fitting and includes a receptor pathway through the cement layer. And a means for transmission of signals that represent the aforementioned characteristics from the receptors to the surface instruments. The system is set up for the inspection of the unique characteristics of the basement in which the well is formed, with the fitting that is attached to the well with a cement layer between the fitting and the hole wall. that Special characteristics mentioned above Can be transmitted via At least part of the thickness of the cement layer The system consists of at least a sensor. One piece for the aforementioned special effects measurements Each receptor is attached to the fitting and includes a receptor pathway through the cement layer. And a means for transmission of signals that represent the aforementioned characteristics from the receptors to the surface instruments.

Claims (10)

1. A system for monitoring the characteristics of the earth formation in which the well is formed with a fitting (12) fixed in the well chamber by a cement layer (28) between the fitting (12) and the well wall, in which such characteristics can be transmitted by at least part of the thickness of the cement layer (28). The system consists of: - at least one sensor (20) for measuring such characteristics, each sensor (20) attached to the fitting (12) and incorporating a sensing pathway (26) protruding into the cement layer; and - a pathway for transmitting the signal representing such characteristics from the sensors (20) to a selected surface instrument, in which case at least one such sensor (20) This includes the pressure sensors for measuring soil pressure, with each pressure sensor consisting of a pressure transducer (20A) which is assembled with a diaphragm (44), a guide tube (39) leading to the diaphragm, and a silicone grease wrap (42) inside that tube, which is connected to the diaphragm (44). The sensing pathway (26) of the pressure sensor (20) consists of a pressure cable (26) which includes a water-permeable wire mesh tube (36) at one end of which is closed and the other end is connected to the aforementioned guide tube (39), a gravel wrap (38) inside that wire mesh tube, and a glass frit (40) inside the guide tube (39) between the silicone grease wrap (42) and the gravel wrap (38). 2. The system of claims in item 1, which comprises a number of the aforementioned receptors (20) that are spaced out along the line of the set (12) mentioned above. 3. The system of claim 1 or 2, whereby the aforementioned means of transmission of the signal consists of a communication line (18) that extends through the fitting (12) to the instrument on the surface mentioned above, by which each receiver (20) is given a communication connection to that communication line (18). 4. The system of claim 3, in which each receiver (20) is connected to the communication line (18) by the use of a connecting rod (22). 5. A system of any of the claims in clauses 1 through 4, where each sensor (20) is enclosed by a sensor enclosure. 6. The system of claim 5, in which each sensor (20) is protected by a protector (24), each protector being comprised of a tightly interlocking sleeve around a housing (12) and a pair of axially positioned plates (30) protruding from the sleeve to receive the housing and the sensor associated with that sensor. 7. The system of claim 6, in which the shield (24) is further incorporated by a number of radially protruding wings (30) positioned primarily centrally axially, protruding from the said casing. 8. A system of any of the claims in Clauses 1 through 7, which includes a number of the aforementioned pressure sensors (20) which are spaced along the fittings (12), where the sensing pathways (26) of a number of sensors are spaced along the holes in such a way that the sensors are relatively insensitive to the axial pressure transmission through the cement (28) as to the radial pressure transmission from the pit to the sensing pathways (26). 9. The system of claim 8, in which the hydraulic spread rate of cement (28) and the spacing of the sensing pathway (26) are adjusted in such a way that the time scale for the connection of pressure from the subsurface to the sensing pathway (26) is small compared to the connection between adjacent sensing pathways. 10. Any system of claims under clauses 1 through 9, in which the hydraulic expansion rate of cement (28) is less than that of the subsoil.