SY/T 5587.3-1993 Conventional well repair operations for oil and water wells. Procedure for well killing and blowdown operations. SY/T5587.3-1993 Standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T5587.3—93
Routine repair and repair of oil and water wells
Well killing and replacement blowout operation procedures
Published on September 9, 1993
China National Petroleum Corporation
Implementation on March 1, 1994
1 Subject content and scope of application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Routine repair and repair of oil and water wells
Well killing and replacement blowout operation procedures
SY/T 5587,3—93
This standard specifies the construction preparation, well killing method, construction procedures, safety and quality control, data collection and other requirements for well killing and replacement blowout operations.
This standard is applicable to well killing and replacement blowout operations of oil and water wells. Gas well killing can also be implemented as a reference. 2 Reference standards
SY/T5292 Specification for measuring instruments for downhole operations in oil and gas fieldsSY/T6821 Drilling fluid testing procedures
3 Terminology
3.1 The process of pumping a liquid with certain properties and quantity into the wellbore and making its liquid column pressure relatively balanced with the formation pressure is called drilling.
3.2 The process of replacing the wellbore fluid with a fluid with certain properties and restoring the production capacity of the wellbore is called drilling fluid.
3,3 The fluid used for drilling fluid and meeting the design requirements is called drilling fluid. 3.4 Water absorption start pressure The pressure at which the oil layer starts to absorb water. 4 Construction preparation
4.1 Materials
4.1.1 Drilling history.
4.1.2 Current status of the tubing structure:
a: tubing specifications
b, downhole tool specifications and depth
c. "Oil pump and sucker rod specifications.
Casing status.
Production status:
Liquid production, oil-gas ratio, comprehensive permanent content, oil pressure, casing pressure and flow pressure,
Static pressure,
Water injection method, injection pressure, daily injection volume. Brief description of previous operations.
Model and specifications of the Christmas tree.
Current status of the location, roads and power supply.
Construction plan and completion requirements.
Approved by China National Petroleum Corporation on September 9, 1993 and implemented on March 1, 1994
4.1.9 Construction design.
4.2 Parameters and tools
Liquid storage container:
b, instruments and measuring instruments,
c. Oil leakage or waste liquid recovery container
d, circulation pipeline and pipe valve accessories.
4.3 Materials
4.3,1 Well killing fluid
4.3.1.1 Selection of well killing fluid density.
Well killing fluid density is calculated according to formula (1)
SY/T 5587.3—93
p/zx102
（1+）
In the formula, y—density of well-killing fluid, kg/m,
P/2——static pressure value measured in oil and water wells in the past three months, MPH——depth of the middle part of the oil layer, ms
——additional amount, 0~15% for operation and 15%~30 for repair.
4.3.1.2 Determination of well-killing fluid quantity.
Well-killing reduction is calculated according to formula (2)
V-ar*h(1+k)
In the formula, V is the amount of well-killing fluid, m\
inner diameter of a casing, m
h—artificial bottom depth of the well, ms
k—additional amount, taken 0～15%.
4.3.1.3 Principles for selecting well-killing fluid.
The damage caused by the well-killing fluid to the oil layer should be the lowest. a.
b. The performance of the well-killing fluid should meet the geological requirements of the well and the block. When using drilling hydraulic wells, the performance of the well-killing fluid should comply with the provisions of SY/T5621. 4.3.2 Replacement fluid
The base of the replacement fluid is calculated according to formula (3)
V2 yuanr\h
Where; V replacement fluid volume, m\
Casing inner diameter, m
h-artificial bottoming depth, m.
4.3.2.2 The performance of the replacement fluid should meet the quality requirements of the replacement fluid construction. 5 Well-killing methods
5.1 Circulation method for well killing
Applicable to oil wells with self-flowing and fast recovery of dynamic liquid level. 5.2 Squeeze and injection method for well killing
When the circulation method for well killing is ineffective, the squeeze and injection method may be used as appropriate. 5.3 Injection method for well killing
Wells with special needs may be carried out according to the geological requirements of the oil field. 2
(3)
5.4 Secondary well killing
SY/T 5587.3-93
When the well killing depth is 10 to 50 m above the top of the oil layer to be killed, the secondary well killing method should be adopted: that is, first circulate the well to kill at the actual well killing depth, then deepen the oil pipe to 1 to 2 m above the artificial well bottom, and then circulate the well to kill until the well is killed. 6 Construction procedures
6.1 Well killing
6.1.1 Release the casing gas.
6.1.2 Pump the isolation fluid.
6.1.3 Pump and inject the pressure and injection fluid.
6.1.4 Check the pressure and injection effect.
Home.2 Replacement injection
6.2.1 Pipeline string.
6,2.2 Lower the replacement injection pipe string.
62.2.3 Pump and inject the replacement injection working fluid.
6.2.4 Check the replacement injection effect.
67,2,5 Lift the replacement injection pipe string.
7 Safety and quality control
7.1 Equipment, tools and materials
7.1.1 The liquid storage container should be able to meet the requirements of the well-killing fluid volume and the replacement injection fluid volume. The container should be corrosion-resistant, clean, neatly placed, and no more than 50m away from the wellhead.
Instruments and measuring instruments should comply with the provisions of SY/T5292. 7.1.2 1
The earth oil pool or waste liquid recovery container shall meet the construction requirements. 7.131
7.1.4The circulation pipeline and pipe valve accessories shall comply with the safety regulations. 7,2 Well KillingwwW.bzxz.Net
7.2.1Use oil to control the release of casing gas before well killing. The isolation fluid shall not be less than 1m.
The pump shall not be stopped during the injection of well killing fluid, and the displacement shall not be less than 0,5m*/min. The maximum pump pressure shall not exceed the oil layer water absorption start pressure.
7,2.4After the well killing fluid is returned, the inlet and outlet displacement shall be balanced, and the pump can be stopped until the inlet and outlet density difference is not greater than 0,02kg/m. 7.2.5Observe that there should be no overflow at the outlet 5~15min after stopping the pump. 7.3 Replacement Spraying
All oil pipes (smooth oil pipes) must be completed in a positive replacement manner. 7.3.2 The pump pressure of the replacement jet should be lower than the starting pressure of the oil layer water absorption, and the displacement should not be lower than 0.5m/min. The pump shall not be stopped during the replacement jet. 7.3.3 The replacement jet depth should be 1-2m above the artificial bottom. 7.3.4 The replacement jet for more than two times should be determined according to the well depth and the density of the pressure and injection fluid. After the replacement jet, the density difference of the inlet and outlet working fluid should not be greater than 0.02kg/m8.7.3.5
8 Data collection
Pressing time, method, and well killing depth.
8.2 Pumping pressure, displacement, circulation pipeline inlet and outlet pressure. 8.3 Name, dosage and performance parameters of well killing fluid and replacement jet working fluid. Replacement jet time, depth, pumping pressure and displacement. 8.4
8.5 Density of the inlet and outlet working fluid of well killing and replacement jet. Note:
sY/t 5587.3—93
This standard is proposed and managed by the Oil and Gas Production Professional Standardization Committee. This standard is drafted by the Daqing Petroleum Administration Bureau Downhole Operation Company. The main drafters of this standard are Li Binggang, Meng Fanzhi and Zhang Yuqin.
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