CN2313040Y

CN2313040Y - Internal-external pressure recording instrument for oil pipe at the moment of being cracked by pressing

Info

Publication number: CN2313040Y
Application number: CN97217549U
Authority: CN
Inventors: 刘国富; 许辉
Original assignee: TIANZHEN CO Ltd DAQING CITY
Current assignee: TIANZHEN CO Ltd DAQING CITY
Priority date: 1997-05-12
Filing date: 1997-05-12
Publication date: 1999-04-07
Anticipated expiration: 2007-05-12

Abstract

The utility model relates to an internal-external pressure recording instrument for an oil pipe instantaneously when an oil well is cracked by pressure, which solves the problem that the breakdown pressure of strata can not be actually measured under the well when the oil well is cracked by the pressure. The utility model is characterized in that a pressure sensor and a circuit board are arranged on the recording instrument to actually measure and record the actual pressure under the well when the oil well is cracked by pressure, and simultaneously, the internal and external pressure of the oil pipe can be measured. After the construction ends, the recording instrument can be taken out and the breakdown and closing pressure of the strata and the construction time can be gained through the microcomputer processing. Therefore, the comprehensive filter loss coefficients of the strata and the geometric size of cracks can be calculated. The utility model has the advantages of small volume, high pressure resistance and vibration resistance and is suitable for oil fields.

Description

Pressure break moment oil pipe external and internal pressure recorder

The utility model relates to a kind of manograph, belongs to wellfracturing moment oil pipe external and internal pressure recorder.

At present, the pressure during wellfracturing can only be observed from the pressure meter on the pressure break pump truck of ground, and then extrapolates the fracture pressure on stratum; This method exists error, all may cause formation fracture pressure is calculated inaccurate as pipeline frictional resistance etc.; Real scientific methods is the fracture pressure of directly surveying stratum when pressing off the stratum in the down-hole, and this just needs a kind of pressure gauge or the manograph that can survey formation fracture pressure in the down-hole; Domestic how tame R﹠D institution has been studied for many years to this, up to the present, does not also have a kind of pressure gauge or the manograph that can directly measure formation fracture pressure in the down-hole.

The purpose of this utility model be exactly provide in order to overcome above-mentioned the deficiencies in the prior art a kind of can be in the down-hole pressure break moment oil pipe external and internal pressure recorder of direct geodetic layer fracture pressure.

The purpose of this utility model reaches by the following technical programs: pressure break moment oil pipe external and internal pressure recorder, it is characterized in that: the inner core end that two pressure sensors is housed and has an inside and outside pressure guide hole is with the oil pipe male joint that is threaded, the two is equipped with sealing ring, the inner core mesopore has the central tube of pressure guide hole and pilot annular groove to be threaded, in the both sides of pressure guide hole and pilot annular groove sealing ring is housed all; The outer wall of central tube is provided with shoulder and has four road grooves, intrinsic two circuit boards and two battery tubes in the groove, and battery tube and pressure sensor are all with holding wire connecting circuit plate; Be placed in urceolus and inner core on the central tube to be threaded, outer tube inner wall is provided with the concave station that matches with the shoulder of central tube, and sealing ring all is housed between urceolus and inner core and the central tube; The other end of central tube is with the oil pipe female joint that is threaded, and the two is equipped with sealing ring.

Above-mentioned pressure break moment oil pipe external and internal pressure recorder, the delivery hole on its central tube is uniform 3～4, is filled with the high viscosity transmission medium in the inside and outside pressure guide hole on the inner core.

The utility model has following advantage than prior art: because this recorder can be placed directly in place, underground fracture stratum, thereby can directly note fracture pressure, the clossing pressure on stratum, also can note the engineering time, and then extrapolate the overall fluid loss coefficient and the crack physical dimension on stratum, all have important function to formulating correct pressing crack construction scheme and accelerating oil field development.

Accompanying drawing 1 is a sectional elevation of the present utility model;

Accompanying drawing 2 is A-A sectional views of the utility model Fig. 1;

Accompanying drawing 3 is B-B sectional views of the utility model Fig. 1.

The utility model is described in further detail below in conjunction with accompanying drawing, show by Fig. 2 and Fig. 3, its inner core 2 of this recorder has four holes in the axial direction, wherein holding wire is equipped with by clamp in two holes, pressure guide hole 11 and outer pressure guide hole 3 in two holes are respectively in addition, be filled with the high viscosity transmission medium in two pressure guide holes (11,3), the equal intrinsic pressure sensor 6 of two pressure guide holes (11,3) port; Inner core 2 ends are with thread connection oil pipe male joint 1, and the two is equipped with sealing ring; Show by Fig. 1, have on the central tube 5 on four pressure guide holes 4 and the periphery wall and have pilot annular groove 12, central tube 5 and inner core 2 endoporus are with thread connection, sealing ring all is equipped with in both sides at pressure guide hole 4 and pilot annular groove 12, the outer wall of central tube 5 is provided with tension shoulder 9 and has four road grooves, intrinsic two circuit boards 7 and two battery tubes 13 in the groove, battery tube 13 provides power supply for circuit board 7, and the two links to each other with lead; Circuit board 7 is accepted the signal and the stored record of pressure sensor 6, the two links to each other with holding wire, be with urceolus 8 on the central tube 5, urceolus 8 inwalls are provided with the concave station that cooperates with tension shoulder 9 on the central tube 5, urceolus 8 and inner core 2 are with thread connection, between urceolus 8 and the inner core 2 and between urceolus 8 and the central tube 5 sealing ring is housed all, central tube 5 other ends are equipped with sealing ring 10 with the female joint of thread connection oil pipe and the two.

Claims

1, pressure break moment oil pipe external and internal pressure recorder, it is characterized in that: two sensors (6) are housed and have an inner core (2) of inside and outside pressure guide hole (11,3) terminal with thread connection oil pipe male joint (1), the two is equipped with sealing ring, inner core (2) mesopore has the central tube (5) of pressure guide hole (4) and pilot annular groove (12) with thread connection, in the both sides of pressure guide hole (4) and pilot annular groove (12) sealing ring is housed all; Central tube (5) outer wall is provided with shoulder (9) and has four road grooves, intrinsic two circuit boards (7) and two battery tubes (13) in the groove, and battery tube (13) and pressure sensor (6) are all with holding wire connecting circuit plate (7); Be placed in urceolus (8) and inner core (2) on the central tube (5) with thread connection, urceolus (8) is provided with the concave station that cooperates with the shoulder (9) of central tube (5), between urceolus (8) and inner core (7) and the central tube (5) sealing ring is housed all; The other end of central tube (5) is equipped with sealing ring with thread connection oil pipe female joint (10) and the two.

2, pressure break moment oil pipe external and internal pressure recorder according to claim 1 is characterized in that: the pressure guide hole (4) of central tube (5) is uniform 3～4.

3, pressure break moment oil pipe external and internal pressure recorder according to claim 1 and 2, it is characterized in that: the inside and outside pressure guide hole on inner core (2) is filled with full-bodied transmission medium in (11,3).