Some standard content:
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY / T 5372--91
Stratified Water Injection Operation Method
Published on July 19, 1991
Ministry of Energy of the People's Republic of China
Implementation on December 1, 1991
1 Subject content and scope of application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Stratified Water Injection Operation Method
SY / T 5372-91
This standard specifies the construction preparation, construction requirements, operation procedures and quantity control of stratified water injection operations in injection wells. This standard applies to the water injection and stratified water injection operation after the casing perforation is completed. 2 Terms
2.1 Injection plan: According to the principle of injection-production balance in the water drive oil project development plan, determine the total daily water injection volume and the water volume allocated to each layer.
2.2 Packer card point depth: The depth from the top surface of the rotary core to the top surface of the packer: 3 Construction preparation
3.1 Well survey
Contents include: drilling time, well structure, cementing quality, oil layer data, perforation data, measurement data, production status, oil and water well work system, previous construction conditions and effects, casing damage, current downhole conditions and pipe string structure, test data, etc. 3.2 Well survey
Contents include: well location, well site, derrick system, power supply. Traffic roads, well pool, pressure liquid pool, oil tree type bow, ground process, communication conditions, etc.
3.3 Prepare construction design and construction preparation
3.3.1 Prepare construction design according to the annotation plan: all. The format of the construction design is shown in Appendix A (Supplement). 3.3.2 Strictly follow the design requirements for construction. If the construction process and measures need to be changed, the design unit must propose a supplementary design, which can be implemented after approval. 3.4 Preparation of special tools According to the requirements of the construction design, prepare special tools such as packers and water distributors, and they must have inspection certificates. Special tools should be drawn with structural drawings. 4 Construction requirements 4.1 Requirements for water injection strings (hereinafter referred to as strings) 4.1.1 At about 110m from the top of the perforation riser: a packer for protecting the casing should be used. 4.1.2 Anti-corrosion pipes should be used for water injection strings. 4.1.3 The distance between eccentric water distributors should generally not be less than 8m. 4.1.4 The water distributor should generally be placed in the middle of the oil layer. Approved by the Ministry of Energy of the People's Republic of China on July 19, 1991 and implemented on January 1, 1991. SY / T 5372-91
4.1.5 The location of the packer's stuck point cannot be in the blasthole, casing coupling or damaged part of the casing. 4.1.6 The depth of the pipe string should be 5-15m below the bottom depth of the perforation. When the bottom stop bag is insufficient, it can be appropriately increased by 3-5m. 4.2 General requirements
4.2.1 Downhole T-tool transportation
The tools should be handled with care during transportation and connection, and should not be dropped or bumped: When the packer is used in winter in high-cold areas, insulation measures should be taken for the packer.
4.2.2 Pipe string measurement 4.2.2.1 The specifications and models of the oil pipes and tools should meet the design requirements and be confirmed to be correct. All the pipes under 4.2.2.2 should be measured by two construction personnel with a steel tape measure of more than 15m in length, and then the quality inspector should check the measurement. The measurement results of the construction personnel should be consistent with the review results of the quality inspector. The error between the actual cumulative length and the measured cumulative length of every 1000m of the oil pipe is ±0.2m.
4.2.2.3 The completion depth of the pipe should be calculated twice by the construction personnel based on the measurement results. The staff shall calculate once, and the result of the second calculation shall be consistent.
4.2.3 Lifting and lowering operation
4.2.3.1 Set up and support as required, and tighten the tension rope. 4.2.3.2 The lowered non-tubing string must be flushed, free of bends and damage, and pass the standard internal diameter gauge one by one. 4.2.3.3 The threads of the lowered well pipe shall be clean, with the original color of the metal visible, and the threaded joints shall be evenly coated with thread grease or sealing grease. The tightening thread force shall comply with the provisions of Appendix B (Supplement). 4.2.3.4 For the lower with positioning screws When removing the thread, pay attention to the position of the clamp to prevent the positioning screw from being twisted off. 4.2.3.5 When lowering the pipe support, the operation should be smooth. When lowering to the perforation section, the speed should be controlled. When lowering a single pipe at a uniform speed, it should not be less than 10 seconds to ensure that it does not fall or scrape, so as to prevent the packer from being released in the middle. 4.2.3.6 The depth position of the packer's card point should be accurately controlled. When necessary, the magnetic locator should be used to check the depth to ensure that the card is accurate and tight. 4.2.3.7 When lifting the pipe string, the packer should be unsealed first, and the pipe string should be lifted for trial. The normal operation can be carried out only when the hanging weight stops normally. 4.2.4 Packer sealing and sealing inspection
4.2.4.1 The technical parameters for sealing should meet the design requirements of the packer of different structures. 4.2.4.2 The packer must be sealed. When using a pressure gauge to check, the lower piece must be clear. 4.2.5 Well Completion
During well completion, the well must be well-equipped and leak-proof, and meet the conditions for washing and injection. 4.3 Special Requirements
4.3.1 No blowdown operation
4.3.1.1 After the plugging device is injected, the pressure must be 8-10MPa, stabilized for 10 minutes, and emptied without overflow before the wellhead controller can be installed. 43.1.21
When lifting and lowering the oil pipe under pressure, the safety slip and pressure system must be installed, and the lifting and lowering of the oil pipe must be controlled according to the operating procedures. 4.3.1.3 During the oil pipe lowering process, water must be poured into the oil pipe in sections. 4.3.2 Blowdown operation
4.3.2.1 The wellhead can be lifted for construction only after the pressure is reduced to a stable pressure. According to the geological requirements Requirement, strictly control the release speed, the overflow during the tubing period shall not exceed 1-2m/h4.3.2.21
4.3.3 Bed and well operation
The amount of well-killing fluid shall be more than twice the volume of the well. 4.3.3.2
The performance and quality of the well-killing fluid shall be stable, the density shall be evenly distributed, and the measurement shall be accurate. 4.3.3.3
The well-killing density shall be calculated based on the measured formation pressure converted to the pressure value of the perforation opening section. The additional coefficient shall not exceed 10%.
4.3.3.4 The well-killing fluid shall not cause damage to the oil layer. According to the lithology of the formation, the physical and chemical properties of the fluid and the hydrodynamic characteristics of the reservoir, various technical performance indicators shall be correctly formulated.
SY / T 537291
4.3.3.5 According to the design requirements, the pressure should be circulated (forward or reverse) and there should be no spraying and leakage. The error of the inlet and outlet density should not exceed ±0.02g/cm2.4.3.3.6 After stopping the system, observe for more than 30 minutes. The wellhead overflow is qualified for well killing. 4.3.3.7 When lifting the tubing, a semi-sealed wellhead should be installed at the wellhead. When semi-expelling the well, a full set of wellhead controllers should be installed. At the same time, a pressure liquid should be injected once every 10 to 15 oil pipes to prevent spraying.
4.3.3.8 When lowering the tubing, the depth requirements of well washing and replacement spraying should be met, and it should be within 3m from the bottom of the actual exploration artificial well. 4.3.3.9 The replacement spraying water volume should be more than twice the volume of the wellbore. The water quality should be clean, the displacement should be about 20m2/h, and the water density should not exceed 1.02g/cm2 to be qualified.
4.3.310 The immersion time of the oil layer should generally not be More than 48 hours. 5 Operation procedures and quality control
5.1 Preparation for drilling
5.1.1 Casing scraping
5.1.1.1 Casing scraping must be carried out for injection wells, plugging wells, scaling wells, etc. During the scraping process, flushing should be carried out according to the situation. After scraping, the casing must be flushed.
5.1.1.2 Sealing well section. The well section and oil layer part that encounter resistance should scrape the casing back and forth more than three times, and circulate and flush. 5.1.2 Well cleaning
5.1.2.1 The diameter of the casing gauge should generally be 46111m smaller than the inner diameter of the casing, and the length should be 0.3~0.5m. In special cases, the gauge should be selected according to the design requirements, but the lower end should not be tapered. 5.1.2.2 When lowering the gauge, operate smoothly, pay attention to the changes in the suspended weight of the indicator weight gauge, and if resistance is found, it should be moved or circulated and flushed, and it is strictly forbidden to press hard.
5.1.2.3 If there is any obstruction, the reasons should be analyzed and the downhole situation should be clarified. 5.1.2.4 After opening, the mountain should be opened for non-standard operation. It is forbidden to carry out sand flushing with the well gauge or other operations with the oil pipe with the well gauge. 5.1.3 Sand type
5.1.3.1 Exploring the sand surface: It is forbidden to use the oil pipe for hard exploration. It is strictly forbidden to carry other tools. 5.1.3.2 The depth of the sand surface is based on the position where the data are consistent for three consecutive times when the oil pipe string is suspended and dropped by 5×10*~20×10°N. The depth of the pipe string is the depth of the sand surface.
5.1.3.3 The sand flushing pipe string is flushed down to 1~~2m away from the sand surface with a large displacement, and flushed to the bottom of the artificial well: until the sand content of the return fluid at the door is less than 0.2%, it is qualified.
5.13.4 When flushing sand, it is steadily and slowly deepened, and the pipe string is required not to spray, block or get stuck. 5.1.3.5 Verify the depth of the sand surface and the artificial bottom, the error should not exceed ±0.3m for every 1000m. 5.1.4 Check the fallen objects in the well and salvage them.
5.1.5 Verify the string
Verify point by point whether there is any string groove outside the pipe at each packer stuck point specified in the injection plan: if the string groove is found, it should be plugged. 5.1.6 Determine the water absorption surface.
5.2 Lower water distribution pipe string
5.2.1 Calculation of pipe string length
5.2.1.1 The length of the inner pipe string is the sum of the compensation distance, the length of the tubing head, the length of the sleeve pipe string and the length of the down-hole tool. 5.2.1.2 The depth of the lower point of the first-stage packer is the sum of the compensation distance, the length of the tubing head, the length of the tubing, the length of the protective packer, the length of the first-stage water distributor and the length of the upper section of the first-stage packer. 5.2.1.3 The depth of the second and third-stage packer stuck points is calculated by analogy with the method in 5.2.1.2. 5.2.2 Washing
5.2.2.1 Before the injection, flush the water line to ensure that the water quality of the inlet and outlet is consistent, and the metering instrument is calibrated and qualified. 5.2.2.2 Generally, no leakage is allowed during the injection. In the last two weeks of the cycle, the micro-spraying should be controlled, and the spraying volume should not exceed 2m/h. —3—
SY/T 5372-91
5.2.2.3 The injection volume shall not be less than 25m/h, and should be controlled at 25~30m2/h. According to SY5329 "Water Quality and Analysis Method for Clastic Oil Injection Water", the injection shall be carried out until the water quality is qualified. 5.3 Construction Summary
5.3.1 After the injection is completed, write a construction summary and report it within 5 days. 5.3.2 The format and content of the construction summary shall comply with the provisions of Appendix C (Supplement). 5.3.3 The abbreviation of the construction summary requires complete information, accurate data, clear description, neat handwriting and neat layout. A1 Format of construction design document
SY / T 537291
Appendix A
Example of construction design document for layered water injection operation
(Supplement)
Format size of construction design document 5 mm: 260×187. A2 Cover format of construction design document
The cover format of construction design document is shown in Table A1. Construction design of water injection well
Design unit:
Oil field (Petroleum Administration Bureau)
Year Month Month
A3 Content and format of construction design
Basic data of oil well (see Table AI)
Surface casing specifications
and depth, m
Technical casing specifications
and depth, m
Oil layer casing specifications
and depth, m
Date of drilling/drilling completion
Constitutional drilling depth, m
Oil layer data (see Table A2)
Permeability
Test results of water injection well (see Table A3)
SY / T 5372—91
Outside of oil layer casing
Cement return height, m
Perforation layer and layer section
Oil compensation distance, m
Artificial well bottom
(or gray surface), m
Date of commissioning
Porosity
Fourth oil (water) well production history and current problems 6
Oil layer temperature
Original oil layer pressure
Formation fracture pressure gradient
Water volume, m\/d
Injection volume
Actual measurement
Inner diameter of water nozzle
Five Construction days and requirements
Six Construction steps and requirements
Seven Schematic diagram of pipe string structure (see Figure A2)
Original pipe string in the well
SY /T 5372-91
Design new tubing
Casing coupling position near the packer
(No. 3)
Non-thickness
Nominal mass
SY /T 537291
Appendix B
Tightening torque of oil pipe threads
(Supplement)
C1 Construction summary report format
SY /T 5372-91
Appendix C
Example of water injection well construction summary report
(Supplement)
Water injection non-construction summary report format size mm: 260×187. C2 Construction summary report cover format
Implementation I. Summary report cover format See Figure C1
Water injection well construction summary
Construction unit:
Satian (Petroleum Administration Bureau)
Year and month H
C3 Construction summary report content and format
Basic data of oil wells (see Table C1)
Surface casing specifications, in
Degree, m
Technical casing specifications, in
degree, m
Oil layer casing specifications, in
degree, m
Oil layer casing outer water
Mud return height, m
Complete drilling depth, m
Artificial well bottom, m
Implementation purpose
Three well washing and water injection conditions
Well washing conditions (see Table C2)
Month day. Hour and minute
2Water injection conditions (see Table C3)
Month. H. Hour and minute
SY / T 537291
Date of oil test
Oil production period
Cumulative oil production: t
Cumulative water injection: m2
Solid and solid foundation
Perforation layer and well section
Well gate pressure
Water injection volume
Outlet water quality
Conversion of water injection volume
Four construction conditions
1 Construction process
2 Sand flushing conditions (see Table C4)
Sand exploration surface
Verification depth
Sand column height
Sand flushing section
Wuqishan pipeline inspection and other
SY/T 5372-91
Bottom depth
Main data
Total overflow fart
Total water injection volume during this construction periodA2 Construction design book cover format
The cover format of the construction design book is shown in A1. Water injection well construction design book
Design unit:
Oil field (Petroleum Administration Bureau)
Year Month Month
A3 Construction design book content and format
Basic data of oil well (see Table AI)
Surface casing specifications
and depth, m
Technical casing specifications
and depth, m
Oil layer casing specifications
and depth, m
Drilling start/completion date
Constitutional drilling depth, m
Oil layer data (see Table A2)
Permeability
Water injection well test results (see Table A3)
SY / T 5372—91
Outside of oil layer casing
Cement return height, m
Perforation layer and layer section
Oil compensation distance, m
Artificial well bottom
(or gray surface), m
Date of commissioning
Porosity
Fourth oil (water) well production history and current problems 6
Oil layer temperature
Original oil layer pressure
Formation fracture pressure gradient
Water volume, m\/d
Injection volume
Actual measurement
Inner diameter of water nozzle
Five Construction days and requirements
Six Construction steps and requirements
Seven Schematic diagram of pipe string structure (see Figure A2)
Original pipe string in the well
SY /T 5372-91
Design new tubing
Casing coupling position near the packer
(No. 3)
Non-thickness
Nominal mass
SY /T 537291
Appendix B
Tightening torque of oil pipe threads
(Supplement)
C1 Construction summary report format
SY /T 5372-91
Appendix C
Example of water injection well construction summary report
(Supplement)
Water injection non-construction summary report format size mm: 260×187. C2 Construction summary report cover format
Implementation I. Summary report cover format See Figure C1
Water injection well construction summary
Construction unit:
Satian (Petroleum Administration Bureau)
Year and month H
C3 Construction summary report content and format
Basic data of oil wells (see Table C1)
Surface casing specifications, in
Degree, m
Technical casing specifications, in
degree, m
Oil layer casing specifications, in
degree, m
Oil layer casing outer water
Mud return height, m
Complete drilling depth, m
Artificial well bottom, m
Implementation purpose
Three well washing and water injection conditions
Well washing conditions (see Table C2)
Month day. Hour and minute
2Water injection conditions (see Table C3)
Month. H. Hour and minute
SY / T 537291
Date of oil test
Oil production period
Cumulative oil production: t
Cumulative water injection: m2
Solid and solid foundation
Perforation layer and well section
Well gate pressure
Water injection volume
Outlet water quality
Conversion of water injection volume
Four construction conditions
1 Construction process
2 Sand flushing conditions (see Table C4)
Sand exploration surface
Verification depth
Sand column height
Sand flushing section
Wuqishan pipeline inspection and other
SY/T 5372-91
Bottom depth
Main data
Total overflow during construction
Total water injection volumeA2 Construction design book cover format
The cover format of the construction design book is shown in A1. Water injection well construction design book
Design unit:
Oil field (Petroleum Administration Bureau)
Year Month Month
A3 Construction design book content and format
Basic data of oil well (see Table AI)
Surface casing specifications
and depth, m
Technical casing specifications
and depth, m
Oil layer casing specifications
and depth, m
Drilling start/completion date
Constitutional drilling depth, m
Oil layer data (see Table A2)
Permeability
Water injection well test results (see Table A3)
SY / T 5372—91
Outside of oil layer casing
Cement return height, m
Perforation layer and layer section
Oil compensation distance, m
Artificial well bottom
(or gray surface), m
Date of commissioning
Porosity
Fourth oil (water) well production history and current problems 6
Oil layer temperature
Original oil layer pressure
Formation fracture pressure gradient
Water volume, m\/d
Injection volume
Actual measurement
Inner diameter of water nozzle
Five Construction days and requirements
Six Construction steps and requirements
Seven Schematic diagram of pipe string structure (see Figure A2)
Original pipe string in the well
SY /T 5372-91
Design new tubing
Casing coupling position near the packer
(No. 3)
Non-thickness
Nominal mass
SY /T 537291
Appendix B
Tightening torque of oil pipe threads
(Supplement)
C1 Construction summary report format
SY /T 5372-91
Appendix C
Example of water injection well construction summary report
(Supplement)
Water injection non-construction summary report format size mm: 260×187. C2 Construction summary report cover format
Implementation I. Summary report cover format See Figure C1
Water injection well construction summary
Construction unit:
Satian (Petroleum Administration Bureau)
Year and month H
C3 Construction summary report content and format
Basic data of oil wells (see Table C1)
Surface casing specifications, in
Degree, m
Technical casing specifications, in
degree, m
Oil layer casing specifications, in
degree, m
Oil layer casing outer water
Mud return height, m
Complete drilling depth, m
Artificial well bottom, m
Implementation purpose
Three well washing and water injection conditions
Well washing conditions (see Table C2)
Month day. Hour and minute
2Water injection conditions (see Table C3)
Month. H. Hour and minute
SY / T 537291
Date of oil test
Oil production period
Cumulative oil production: t
Cumulative water injection: m2
Solid and solid foundation
Perforation layer and well sectionbzxz.net
Well gate pressure
Water injection volume
Outlet water quality
Conversion of water injection volume
Four construction conditions
1 Construction process
2 Sand flushing conditions (see Table C4)
Sand exploration surface
Verification depth
Sand column height
Sand flushing section
Wuqishan pipeline inspection and other
SY/T 5372-91
Bottom depth
Main data
Total overflow during construction
Total water injection volume
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