SY 5593-1993 Drilling Coring Quality IndexSY5593-1993 Standard Download Decompression Password: www.bzxz.net

SY5593-93 Petroleum and Natural Gas Industry Standard of the People's Republic of China
Drilling and Coring Quality Index
Published on March 27, 1993
Ministry of Energy of the People's Republic of China
Implementation on September 1, 1993
Title Content and Applicability
Petroleum and Natural Gas Industry Standard of the People's Republic of China Drilling and Coring Quality Index
This standard specifies the quality index and inspection method for coring of oil and natural gas drilling. This standard is applicable to the inspection of coring quality of oil and natural gas drilling. Referenced Standards
SY6343
SY5090
Method for Determination of Filtrate Invasion into Core
Calculation Method for Core Recovery Rate of Drilling and Coring
3.1 Core recovery rate, the percentage of the actual length of the core taken out to the intended coring footage. 3.2
Core sealing rate: the percentage of the sum of the core sealing and micro-immersion blocks to the total number of core sampling blocks. 3.3Core pressure retention rate: the percentage of the ratio of the core pressure measured on the ground to the calculated pressure of the bottom hole liquid column. 3.4
Core orientation success rate: the percentage of the number of orientation success points with incision marks on the core to the total number of orientation points. 3.5
Loose formation: the formation where the rock formation is loose, broken, poorly cemented, and the core is not easy to form. General formation: other formations except loose formation. Quality indicators
Quality indicators are shown in Table 1.
Conventional coring
Sealed coring
Pressure-maintained coring
Fixed-point coring
Item approved by the Ministry of Energy of the People's Republic of China on March 27, 1993
Harvest rate
Harvest rate
Sealed rate
Harvest rate
Correctness rate
Sealed rate
Harvest rate
Dome formation
Oriented success rate
$Y 659393
Standard, %
Scattered formation
Implemented on September 1, 1993
5 Inspection methods
5.1 Core recovery rate
5.1.1 Single-barrel core recovery rate
SY 5593—93
The single core recovery rate shall be calculated according to 1.1.2 of SY5090. 5.1.2 The total (or several) core recovery rate and (or several) core recovery rate shall be calculated according to 1.1.3 of SY5090. 5.1.3 Single core drilling footage
Single core drilling footage shall be calculated according to 2.1 of SY5090. 5.1.4 Single core length
Single core length shall be calculated according to 2.2 of SY5090. 5.15 The value range of core length and core drilling footage shall be rounded to two decimal places. 5.2 Core Sealing
5.2.1 Determination Principle
This method uses a certain amount of ammonium thiocyanate added to the water-based drilling fluid as a tracer. When drilling and coring, if the drilling fluid filtrate invades the core, the ammonium thiocyanate dissolved in the filtrate will also enter. The degree of intrusion of the drilling fluid filtrate into the core can be determined by measuring the content of ammonium thiocyanate in the core and the concentration of ammonium thiocyanate in the drilling fluid. 5.2.2 Detection method for the amount of filtrate invading the core 5.2.2.1 Iron salt colorimetric method
The detection method and steps of the iron salt colorimetric method are carried out in accordance with Section 4.1 of SY5343. 5.2.2.2 Pyridine benzidine colorimetric method
The detection method and steps of the pyridine benzidine colorimetric method are carried out in accordance with Section 4.2 of SY5343. 5.2.3 Sealing level regulations
Sealing level regulations are shown in Table 2.
Sealing level
Sealing level
Micro-invasion level
Total invasion level
5.2.4 Calculation of core sealing rate
The core sealing rate is calculated according to formula (1).
In the formula:
M-core sealing rate, %
-Number of samples of sealing level in the tested core samples, pieces, Nw--Number of samples of micro-invasion level in the tested core samples, pieces: Nz--Total number of tested core samples, pieces. 5.2.54
The sealing level of each core tube is not tested at 0.3m from the top and 0.3m from the bottom. 2
1kg drilling fluid filtrate intrusion in the core, mL≥1~3. 34
5.3 Core pressure holding rate
5.3.1 Calculation of core pressure holding rate
The core pressure holding rate is calculated according to formula (2).
In the formula, B—core pressure holding rate, %
SY5593—93
P×100%
P:—ground measured core pressure, MPas
P,—calculated pressure of bottom liquid column, MPa.5,3.2 Calculation of bottom liquid column pressure
The bottom column pressure of the well is calculated according to formula (3). P.=9.81X10-*pH
Where: P.-hole bottom liquid column pressure, MPa, 0-drilling fluid density, g/cm
H-liquid column vertical height (well depth), m
9.81X10-8-unit conversion factor.
(3)
5.3,3Surface core pressure measurement
5.3.3.1After the core barrel is pulled out and connected, place the core barrel on the special workshop vise rack, remove the pressure measuring joint plug, and install the pressure sensor to the sealing joint plug.
.3.3.2Connect the other end of the pressure sensor to the pressure recorder connector. 5.3.3.3Press the pressure recorder to the bottom liquid column pressure value. 5.3.3.4 Remove the simple valve of the core, so that the pressure maintained in the core barrel enters the pressure recorder display through the sensor. The clear pressure value read on the display is the surface core pressure.
5.4 Core orientation success rate
The core orientation success rate is calculated according to formula (4). D=Kx×100%
Wherein, D is the core orientation success rate,
K is the number of successful orientation points with notches on the core and K is the total number of orientation points during coring.
Additional notes: www.bzxz.net
This standard is proposed and managed by the Petroleum Drilling Engineering Professional Standardization Committee. This standard was drafted by the Second Exploration Company of the North China Petroleum Administration Bureau. The main drafters of this standard are Bao Shixun, Liang Bao and Yang Mingjin. (4)
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