Underground temperature and pressure measuring system for hot-exploiting oil well

• US 5,002,124 A
• Filed: 06/21/1990
• Issued: 03/26/1991
• Est. Priority Date: 06/21/1990
• Status: Expired due to Fees

• Current Assignee: Research Institute of Drilling and Production Technology Liaohe Petroleum Exploratory Bureau Pan JING LIAO NING China
• Original Assignee: Research Institute of Drilling & Production Tech
• Inventors: Ming, Ma, Min, Li, Li, Liu, Zhenfang, Sun, Chunyan, Wang
• Primary Examiner(s): BUIZ, MIKADO RYAN
• Application Number:
  US07/542,155
• Time in Patent Office: 278 Days
• Field of Search: 166/64, 166/250, 73/37, 73/154, 374/135, 374/136, 374/143, 374/186, 374/187, 374/196, 374/206, 374/207
• US Class Current: 374/136
• CPC Class Codes: E21B 47/06 Measuring temperature or pressure
• CPC Class Codes: E21B 47/07 Temperature
• CPC Class Codes: E21B 47/26 Storing data down-hole, e.g. in a memory or on a record carrier

Abstract

A kind of underground temperature and pressure measuring system for hot-exploiting oil well mainly comprises a casing, a high-temperature sealing element, a high-temperature time-controlling unit, a pressure sensing unit and its recording system and a temperature sensing unit and its recording system, wherein, the high-temperature sealing element is made of flexible graphite, and the pressure sensing element is made of particular material; the temperature sensing unit is connected with the pressure sensing unit by bellows, so that the temperature sensing unit and its recording system can be put around the pressure sensing unit and its recording system, and therefore the present device is not long, but it can be used to measure temperature and pressure of underground steam at different depth simultaneously, which make the calculation of underground thermal conditions possible and reliable.

Claims

1. A kind of underground temperature and pressure measuring system for hot-exploiting oil well comprising a casing;

a time-controlling unit;

a high-temperature sealing element fitted between a lower connecting unit and said casing;

a pressure sensing unit and its recording system, wherein, a pressure sensing element in said pressure sensing unit is spiral pipe, one end (fixed end) of which is connected with the lower connecting unit of said casing, and other end (free end) of which is connected with a transmission shaft rotatably mounted on the lower connecting unit of said casing, and a pressure recording pen is fixed on said transmission shaft, and yet a temperature sensing unit and its recording system is put around the pressure sensing unit and its recording system, so that it is possible to measure temperature and pressure simultaneously, and a spiral temperature sensing element made of thermometal is put around the hollow shaft, one end (free end) of which is connected with a lower end of a hollow shaft, and other end (fixed end) of which is connected with righting unit A fixed on the casing;

an upper end of said hollow shaft is connected with a temperature recording pen by means of bellows, the series connected hollow shaft, bellows B and temperature recording pen is put around the series connected transmission shaft, bellows A and pressure recording pen;

a righting unit B is fixed on the lower end of the hollow shaft, and said transmission shaft passes through a center hole of said righting unit B, and therefore the lower end of said hollow shaft is righted by the lower end of said transmission shaft;

a center hole is formed in the righting unit A fixed on the casing, through which the hollow shaft passes, and therefore the hollow shaft is righted by the casing;

a righting slice for pressure recording pen is arranged on the upper end of the pressure recording pen, and a center shaft of the recording cylinder which is mounted on the casing movably in the axial direction passes through the center hole of said righting slice, so that the pressure recording pen is righted by the center shaft of the recording cylinder;

a righting slice for temperature recording pen is arranged on an upper end of the temperature recording pen, and the pressure recording pen passes through the center hole of the righting slice for temperature recording pen, so that the upper end of the temperature recording pen is righted by the pressure recording pen which is righted by the center shaft of the recording cylinder;

said time-controlling unit uses a high-temperature clock to drive the recording cylinder to move at uniform speed in an axial direction.

2. A kind of underground temperature and pressure measuring system for hot-exploiting oil well as claimed in claim 1, wherein, a similar center hole on shape is respectively formed in the righting slice for temperature recording pen, the righting slice for pressure recording pen, the righting unit A and the righting unit B, and three flanges which extend toward the center of said hole are arranged on each hole, and the top surface of said flanges is fitted with the exterior surface of the pressure recording pen, the center shaft of the recording cylinder, the hollow shaft and the transmission shaft respectively which pass through the corresponding center hole.

3. A kind of underground temperature and pressure measuring system for hot-exploiting oil well as claimed in claim 1 or 2, wherein, the pressure sensing element of said pressure sensing unit is a spiral spring pipe, which is made of a kind of precise constant-elastic material which consists of Ni:

40%-45%;

Co;

10%-15%;

Ti;

2%-5%;

Al;

0.7%-1.0%;

Nb;

1.0%-1.5%;

C;

0.005%-0.05% and Fe, and said high-temperature sealing element is made of flexible grapgite.