SY/T 5587.13-1993 Methods for salvaging small fallen objects in conventional well repair operations for oil and water wells
Some standard content:
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T 5587.13--93
Routine well repair operations for oil and water wells
And methods for salvaging small objects in the well
Published on September 9, 1993
China National Petroleum Corporation
Implemented on March 1, 1994
Subject content and scope of application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Routine well repair operations for oil and water wells
Methods for salvaging small objects in the well
SY/T 5587.13--93
This standard specifies the preparation, operation procedures, operation quality control and safety requirements, and operation quality standards and inspections for salvaging small objects in the well.
This standard applies to the salvage of small objects in vertical oil and water casing. Other types can also be used for reference. 2 Terminology
2.1 Small fallen objects
refers to small fallen objects that fall into the well and cause abnormal impact on oil and water production or operation. 2.2 Rod-shaped small fallen objects
refers to long fallen objects such as weighted rods, plumb bobs, yield meters, pressure gauges and test instruments. 2.3 Other small fallen objects
refers to small fallen objects of irregular shapes such as screws, small tools, steel balls, gears, slip fragments and wax scrapers without steel wire. Construction design
The construction design document shall comply with the provisions of Appendix A (Supplement). Preparation for work
4.1 Preparation of tools
Common tools for salvaging small fallen objects (see Table 1) Table 1
Tool name
Magnetic salvage device
Circulating salvage device
Grasping salvage tools
Measurement and instrument salvage tools
Self-made salvage tools
Milling and grinding tools
Ferromagnetic fallen objects that can enter the cylinder
Small or fragmented objects
Non-fragmented objects
Well logging downhole instruments
Specially designed for certain objects
Used when other tools cannot be used
Approved by China National Petroleum Corporation on September 9, 1993
Implementation on March 1, 1994
4.1.2 The original principle of self-made small object salvage toolsSY/T 5587.13--03
4.1.2.1 It can be lowered smoothly into the well and has the ability to self-lock against the objects that enter. 4.1.2.2 It has a safety insurance mechanism.
4.1.2.3 It has a knot tree diagram and indicates the dimensions of each part. 4.1.2.4 It has a wide source of materials and is simple to manufacture. 4.2·Preparation for wellbore
4.2.1 Wellbore control
Wellbore pressure operation should be free of spraying and leakage, and safe and reliable wellbore control devices should be available for wellbore pressure operation. 4.2.2 Wellbore requirements
a. The salvage worker can smoothly go down to the location of the fallen object and can work normally. b. For wells with damaged or deformed casing, casing repair measures must be taken first to ensure that the salvage tools can be raised and lowered smoothly. c. Wells with sand must be flushed first to flush out the buried fallen objects, so as to facilitate construction. 4.2.3 Understand the situation of fallen objects
Before salvage operation, the situation of fallen objects should be verified by printing or other methods based on non-historical data, and all data should be obtained in full and accurate. The following matters should be noted when printing:
a. The lead mold used is intact and qualified:
d. The lead mold diameter is 8~10mm smaller than the inner diameter of the sleeve arm 1c. Apply a force of 10~20kN when printing, and do not hit twice d. The drilling is stable.
5 Operation procedures
5.1 Tool selection
5.1.1 Small rod-like objects should first be salvaged using a grabbing tool or a measuring instrument and a salvage device. 5.1.2 Ferromagnetic objects that can enter the body of the magnetic carrier should first be salvaged using a magnetic carrier? Objects that have become fragments or debris or objects with a very small size should first be salvaged using a circulating salvage device: other small objects should be salvaged using appropriate grabbing tools. 5.1.3 When other salvage tools are ineffective or the well conditions are not suitable for the use of other tools, sleeve milling and grinding tools can be used, but their use should be minimized or avoided during construction.
5.2 Operation steps
5.2.1 Select the tool and check whether it is qualified.
5.2.2 Check the drilling tool assembly and review the drilling tool data. 5.2.3 Check the equipment, instruments, meters and test run. 5.2.4 Connect the two tools and lower them into the well.
5.2.5 Perform the lifting operation.
5.2.6 Lift the tool to check the salvage situation.
5.2.7 Decide whether to continue to use this tool for salvage or replace it according to the inspection situation. 5.3 Salvage tool operation method
5.3.1 For the salvage tools and measuring instruments, the salvage worker should start the pump to clean the tools when they are 5~10m above the expected falling position, and control the lowering speed to less than 16m/min, and slowly lower them until the indicator weight shows a drop. After contacting the falling object, increase the drilling pressure to reduce the suspended weight by 10~30kN. The rotating tool speed is controlled to be no more than 65r/min. 5.3.2 For the magnetic salvage device, the pump is turned on when the tool is 5~10m above the expected falling object position. Under the condition of ensuring circulation, the lowering speed is controlled to be no more than 15m/min, and the tool is slowly lowered until the indicator weight meter shows a decrease (pay attention to the change of pump pressure when exploring the falling object). Then lift it up 2~3m to circulate and wash the well for no less than 3Dmin, stop the pump, pressurize about 5N from different directions, and start drilling. 5.3.3 For the reverse circulation salvage basket, the pump is turned on when the tool is 5~10m above the expected falling object position. Under the condition of ensuring circulation, the lowering speed is controlled to be no more than 15m/min, and the tool is slowly lowered until the indicator weight meter shows a decrease. Then lift it up 0.1~0.2m to throw the ball, with a displacement of no less than 300L/min, reverse circulation and wash for 0.5~1h, and start drilling. 5.3.4 Milling, casing
5.3.4.1 Drilling tool assembly
When using rotary drilling and repair equipment, the following drilling tool assembly shall be used: a. From bottom to top, milling (casing milling) tools, safety joints, drill pipe string and square drill pipe, b. According to the downhole conditions, drill chain and stabilizer can be added to the drilling tool assembly. 5.3.4.2 Operation method
When the connecting tool is lowered to 5~6m above the falling object, open the poly washing piece, slowly lower it to the falling object position, add drilling pressure of 10~20kN, speed of 50~85r/miⅡ, the displacement should be determined according to the annulus size, the depth of the falling object, and the performance of the repair fluid, and it must be ensured that the debris can be carried back to the ground. 5.3.4.3 Cleaning and bottoming
The falling object is milled without post-circulation washing and bottoming for more than one week, and the displacement is not less than 300L/min. After washing, use a circulating salvage basket or magnetic salvage device to remove the debris in the well to ensure that the bottom of the well is clean. 6 Quality control
6.1 Quality of repair fluid
The use of repair fluid should minimize the damage to the formation. The performance of the repair fluid is stable and meets the carrying performance and temperature requirements during operation. 6.2 Drilling tool combination
6.2.1 The rotary table drill and drilling tool combination should first select the drill pipe as the drilling tool. The drilling tool combination of other types of operating equipment should meet the equipment use requirements. 6.2.2 The drilling tool combination should have a safety insurance structure. 6.2.3 The drilling tool and its combination should have a structural record and structural diagram, and the size should be indicated. 6.2.4 The maximum outer diameter of the lowering tool should be 8~~10mm less than the inner diameter of the casing 6. Drilling
6.3.1 The drilling operation should be smooth, without pushing, lifting and releasing, and without pushing the rotary table. 6.3,2 Check the tools after drilling. If there is any damage, replace them in time and describe the damage. 6.4 Milling and grinding
6.4.1 When there is no progress in a fixed position of grinding or milling for 20 minutes, the drilling must be stopped, the cause must be analyzed, and the next step must be decided. 6.4.2 When the pump is stopped in the middle, the tool must be moved away from the falling object position, and the drill must be moved repeatedly. 6.4.3 If a serious jump or reverse occurs in the middle, the cause must be analyzed before deciding the next step. 6.5 Other quality control
Fill in the shift report and the target report as required.
6.5.2 Measure and describe the fallen objects caught each time. 6,5.3 A summary and analysis should be made at the end of the construction. If it is an intermediate process, a summary should be written to obtain the complete and push data. If it is a single process, a construction summary should be written. The construction summary should comply with the provisions of Appendix B (Supplement). 7 Quality indicators and inspection
7.1 Quality indicators
a. Meet the design requirements and objectives
b. No damage to the casing
c. Take measures to protect the oil layer during construction to prevent oil layer pollution; d. The data collection content complies with the provisions of Appendix A (Supplement) and Appendix B (Supplement). 7.2 Inspection
7.2.1 During single-process construction, the method of measuring the bottom of the lift to the design required depth is used for inspection. 3
SY/T5587.13--93 bZxz.net
7.2.2 If it is an intermediate process, it must meet the construction requirements of the next process. 7.2.3 During the construction process, no pipe and casing damage and oil layer pollution caused by improper measures will occur. 7.2.4 All data should be complete and accurate.
A single process construction should write a construction summary. The construction summary should comply with Appendix B (supplement) and be accompanied by a construction design copy. 7.2..5
A1 format
$Y/T 5587.13—93
Appendix A
Construction design for salvaging small fallen objects
(supplement)
Use 16-page format with 787×1092mm paper size. A2
Content format
, basic data
Study drilling depth, m
artificial bottoming, m
cement return height,
oil layer temperature. 'C
Reservoir strength, MPa
Current sand surface, ㎡
Sand production
Reservoir casing grid
Casing integrity
Perforation and, ㎡
Well structure
Reservoir physical properties
II. Previous workovers
Drilling completion month
Height of core filling,
Contract and quality| |tt||The average daily production in the three months before the repair, (/d
Date of pressure measurement
Liquid density of the previous repair, g/cm
3. Falling objects
4. Construction purpose and requirements
5. Preparation before construction
1 Equipment preparation
Gongxian Xiongbei
6. Construction design
Construction well team
SY/T 5587.13—93
Drop time
Technical person in charge
Location of falling objects
SY/T 5587.13—93
Attached Scene B
Summary of Small Fallen Object Salvage Construction
(Supplement)
Use 16-page format of 787×1092mm paper. B2
Design book cover format
Summary of Small Fallen Object Salvage Construction
Summary person
Construction well team
B3 Content format
, basic data
Complete drilling and depth, m
Artificial well bottom, m
Cement return height, Ⅱ
Oil layer temperature, 'C
Oil pressure, MPa||t t||Current sand surface, m
Casing specifications of oil layer
Well structure
Drilling completion date
Height of core filling, m
Cementing quality plate
Average daily production in the first three months of repair, t/d
Pressure measurement date
Density of workover fluid, s/cm
Brief description of construction process
Construction process
III. Conclusion
Construction time
Quality assessment after completion of operation
Construction experience summary:
Suggestions for next improvement,
Additional instructions:
$Y/T 6587.13--93
Construction content and main data
Concluder
This standard is proposed and managed by the Oil and Gas Production Professional Standardization Committee. This standard is drafted by the Xinjiang Petroleum Administration Bureau's Downhole Operations Department. The drafters of this standard are Yang Zhiyi and Liu Zhonglun. 8
Reviewer
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