SY/T 5587.8-1993 Procedures for finding, sealing and checking strings in routine workover of oil and water wells
Some standard content:
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T 5587.8--93
Routine repair and merging operations of oil and water wells
Operation procedures for finding, sealing and checking strings
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 merging operations of oil and water wells
Operation procedures for finding, sealing and checking strings
This standard specifies the process methods, steps and quality requirements for finding, sealing and checking strings in oil (water) wells. This standard applies to the operations of finding, sealing and checking strings in the external string groove of oil (water) parallel pipes. 2 Reference standards
SY/T 6687.16
SY/T 5587.5
SY/T 5587.7
3 Terminology
Operation procedures for conventional well repair of oil and water wells, well clearing and casing scraping, conventional well repair of oil and water wells, sand flushing operation procedures for sand exploration of oil and water wells, conventional well repair of oil and water wells, well washing operation procedures 3.1 Pipe crossover: crossover between the outer wall of casing and cement ring or cement ring and well wall. SY/T 558T.8—93
3.2 Crossover inspection: the process of checking the effect of plugging crossover by pressurizing and observing the overflow volume or pressure change at the wellhead. 4 Finding rate
4.1 Finding crossover by acoustic amplitude logging
4.1.1 Operation preparation
4,1.1.1 Collect and analyze historical data.
4.1.1.2 If the casing is deformed or damaged or there are fallen objects under the well that affect the operation, it should be handled. 4,1.1.3 Prepare the construction design. The content and format of the construction design are as specified in Appendix A (Supplement). 4,1.2 Operation procedures
Pull out the original well string, run the well gauge to the bottom of the artificial well or below the predicted well section. Use 1,5 to 2 times the volume of the wellbore to wash the well and then pull out the well washing string. 4.1.2.2J
Measure the well with the instrument.
Interpret the logging curve.
4.1.3 Operation quality requirements and inspection
Clean the well bottom and the predicted well section, and construct according to SY/T5687.7 until it meets the design requirements. 4.1.3.1
4.1.3,2 No damage to the casing, and the instrument is lifted and lowered smoothly. 4133
The data interpretation is accurate and the design purpose is achieved. 4.1.3.41
Data collection content:
Well drilling specification, length, drilling depth, description of the encountered situationa.
Well washing date, well repair fluid name, plate used, well washing depth logging period, instrument model (name), data interpretation results. c.
4.2 Isotope measurement and search application
China National Petroleum Corporation1993-09-09Approved1994-03-01Implementation
4.2.1 Operation preparation
4.2.1.1 Collect the situation and history data.
SY/T S587.8-—93
4.2.1.2 Prepare the construction design. The content and format of the construction design are stipulated in Appendix B (Supplement). 4.2.1,3 Prepare isotopic fluid according to design requirements. 4.2.1.4 Cement truck and repair and well fluid should meet design requirements. 4.2.2 Operation procedures
4.2.2.1 Well drilling.
4.2.2.2 Sand flushing and well washing. Lower the smooth oil pipe to 1~~2m above the bottom of the artificial well, flush the sand and clean the wellbore on the sand surface, and pull out the oil pipe in the well. 4.2.2.3 Measure the radioactive baseline.
4.2.2.4 Lower the pipe string according to the design and install the wellhead.
4.2.2.5 Connect cement to the (fracturing truck) inlet and outlet pipelines and ground pipelines. And test the wellhead according to design requirements. 4.2.2.6 Test extrusion according to design requirements.
Replace the isotope liquid to 10m above the oil layer to be measured, close the casing gate and squeeze, and close the wellbore until the design time after the displacement fluid is squeezed. 4.2.2.8
Deepen the tubing string to 3-5m above the bottom of the well (or the depth required by the design). 4.2.2.9 Backwash the well.
4.2.2.10 Pull out the tubing string in the well. It is recommended to use a small instrument for logging. The smooth tubing is completed 50m above the well section where the string is found. Measure the radioactivity curve and interpret it.
4.2.3 Operation quality control and safety requirements
4.2.3.1 The smooth tubing is completed at the lower part of the oil layer at the string location. When stratifying, the packer seat is in the middle of the interlayer of the section to be logged. 4.2,3,2 Isotope liquid is prohibited during pressure test and squeeze test. The isotope liquid should be stirred evenly when preparing, and the container should be clean. 4.2.3.3
4.2.3.4 High pressure and well logging should be carried out after well killing. Personnel are prohibited from crossing the high pressure area during operation.
4.2.3,6 When washing the well, the amount of workover fluid used shall be no less than twice the volume of the wellbore. The first volume of fluid returned from the wellbore shall be treated with residual fluid on the ground in accordance with environmental protection requirements.
4.2. 4 Operation quality requirements and inspection
4.2.4.1 The wellbore and sand exploration surface shall meet the quality requirements specified in SY/T5687.18 and SY/T5587.5. 4.2.4.2 Before and after the isotope fluid is squeezed and backwashed, the wellbore shall be clean, and the well washing shall comply with the provisions and design requirements of the washing quality in SY/T5587.7.
4,24.3 When squeezing the isotope fluid, the displacement amount shall be accurate (the measurement error is less than 0.5%), and it is forbidden to squeeze the workover into the formation and the cross-section. 4.2.4.4
The measurement shall be carried out within the radioactive half-life. 4.2.4.5 Data collection content:
Well-drilling, sand-surface exploration, sand-washing data
Well-killing fluid name, performance
Baseline well section:
Pipeline structure of isotope liquid and complete isotope liquid formula (name, strength, concentration), replacement amount, squeeze-in amount (item replacement amount), total dosage, pump pressure, well-closing time, well-washing fluid name, pump pressure, inlet and outlet volume; f
9. Isotope measurement results.
4.3 Isolation search rate
4.3.1 Operation preparation
4.3.1,1 The thickness of the interlayer between the search strings should meet the requirements of Table 1. 4.3.1.2 There is no fallen objects in the well, and the casing is in good condition. 2
depth, m
1500~2500
SY/T 5587.8--93
Compensation thickness, m
Finding and basic data are complete, and the quality of the interval and the depth of the upper and lower casing couplings of the well section are clear. 4.3.1.3 When the well section of the
finding string does not have an inlet and outlet hole, make up the observation hole in the suspected interlayer of the section. 0.5m shoot 4~5 holes: the holes should be evenly 4.3.1,4 #
4.3.1.5 Arrange the pipe string according to the connection sequence of the pipe string
a. Single packer: from bottom to top, it is a choke or sieve packer, upper tubing, b. Double packer: from bottom to top, it is a packer, lower tubing, choke or sieve, packer, upper tubing. 4.3.1.6 The cement and repair fluid meet the construction needs. 4.3.1.7 Prepare the construction design. The content and format of the construction design are as specified in Appendix C (Supplement). 4.3.2 Operation procedures
Pull out the pipe string in the well, lower the smooth oil pipe to explore the sand surface, and flush the sand to the bottom of the artificial well. 4,3.2.1 Yuan
Lower the pipe string to 10~～30m below the bottom boundary of the section to be measured. 4.3.2.3 Lower the pipe string to the design required sealing position and install the pipe joint. 43.2.4 Connect the cement truck inlet and outlet pipelines and the ground pipeline for pressure test. Install the oil casing pressure gauge. 4.3.2.5 Inspection. The injection pump pressure is 10MPa for 10~30min. There is no return volume (overflow) or no change in casing pressure. It is qualified. 4.3.2.6 Adjust the position of the pipe string, inject positively at the three pressure points of 8MPa, 10MPa, 8MPa or 10MPa, 8MPa, 10MPa for 10 to 30 minutes respectively, and observe and record the changes in casing pressure or overflow volume. If the casing pressure or overflow volume changes with the injection pressure, it is preliminarily considered to be a string.
4.3.2.7 Adjust the pipe string to the same position as in 4.3.2.3, check the integrity of the packer according to the requirements of 4.3.2.5, and implement the reliability of the step number in 4.3.2.6.
4,3.3 Operation quality control and safety requirements
4,33.1 When a new well is drilled, the casing should be scraped and tested first. 4.3.3.2 The workover fluid is free of impurities, and the pipeline and large tank (metering tank) are clean. 4.3.3.3 When the well is sealed with a self-sealing well sealer, prevent the well sealer from slipping during drilling. 4.3.3.4 For multi-layer wells that may produce sand, when lifting the packer after measuring a point, the pressure should be released and the packer should be lifted slowly (<10m/min) to prevent sand from forming and causing drill bit sticking.
4.3.4 Operation quality requirements and inspection
4.3.4.1 Sand surface exploration, sand flushing and well clearance are the same as 4.2.4.1. The pipe string is measured accurately, and the packer seat is located in the interlayer of the section to be measured and avoids the casing coupling. 4,3.4.25
When finding the string, use active water or crude oil in the oil layer to prevent contamination of the oil layer. Do not inject well repair fluid or dirt into the formation, string 4.3.4.3
slot.
4.3.4.4 Data collection content,
Pipe cleaning (scraping), sand flushing data,
Observation hole section, perforation type, number of holes,
Finding application date,
d Pipe string structure and schematic diagram;
e, Finding string layer, well section:
SY/T5587.8--93
k, Finding string well repair fluid name, performance, injection (squeezing) pump pressure, observation time, injection volume, return volume (book flux), oil, casing pressure change value;
9. Tubing and packer leak test,
h. Conclusion.
5 Packing string
5.1 Operation preparation
5.1.1 The thickness of the packing string interlayer is the same as that of Article 4.3.1.1. 5.1.2 The arm column structure is the same as that specified in Article 4.3.1.5. 5.1.3 When the squeeze-in method is used to seal the string, the lower oil layer of the string slot is sealed with sand filling. 5.1.4 Prepare the construction design. The content and format of the construction design are specified in Appendix D (Supplement). 5.1.5 Carry out an indoor cement slurry performance test on the construction fluid at the corresponding well temperature of the sealing depth. 5.1.6 Prepare vehicles according to design requirements.
5.2 Operation procedures
5.2.1 Circulation method to seal the string
Lower the sealing string pipe string to the designed position and install the parallel port. 5.2.1,1wwW.bzxz.Net
5.2.1.2 Test the pressure of the inlet pipeline and the parallel port. Verify the connection after the repair and repair fluid is positively circulated to wash the well. If the overflow volume or the attack pressure changes with the positive injection pressure when the positive injection pressure is 8-10MPa, then proceed to the next step.
Prepare the cement slurry and filler cement slurry according to the design requirements. 52.1.4
Replace the cement slurry in the slot.
Lift the pipe and hang the section to select the well position and backwash the well. 5.2.1.6
5.2.1.7 Lift the pipe string to 20~50m above the top of the perforation. Fill the well with workover fluid, close and wait for 24~48h. 5,2.2 Sealing rate of packing and squeezing method
5.2.2.1 Lower the column and test the pressure in the same way as in 5,2,1.1 and 5,2,1,2. 5.2.2.2 After backwashing the well with the workover fluid, squeeze the workover fluid until the pressure is stable. 5.2.2.3 Squeeze the prepared cement slurry according to the design requirements. The remaining operation steps are the same as in 52.1.6 and 6.2.1.7. 5.3 Operation quality control and safety requirements
5.3.1 The filler of the filler cement slurry is slag, right cotton rope head, walnut shell, etc. The amount of addition is selected according to the flux and actual situation. 5.3.2 The upper part of the seal follower of the sealing string pipe string should be connected with a safety joint. 5,3,3 When squeezing cement slurry, all equipment should operate normally. If the pump is obviously opened, stop squeezing and replace it with repair and grout. 5.4 Operation quality requirements and inspection
5,4.1 All work of squeezing and replacing cement slurry should be completed within 70% of the initial setting time of cement. 5.4,2 When washing and grouting, the amount of repair and grouting liquid used should not be less than 1,5~2 times the volume of the grout. The connection sequence and completion depth of the sealing string pipe string meet the design requirements. The seal follower and the pipe string should be sealed and safe. 54.31
The displacement fluid is accurately measured and the amount meets the design requirements. The filler cement slurry is replaced to the perforation hole. 6.4.5
Data collection content,
Tubing structure,
Sealing date,
Inlet and outlet layers, well sections, sealing well sections, d.
Corrected overflow (throughput) or casing pressure changes; e,
Cement test data,
SY/T 5587.8--93
fSealing cement slurry preparation quantity, relative density, additive name, dosage, filler cement slurry formula, relative density, preparation quantity, various cement slurry injection quantity,
Replacement name, old quantity,
Injection pump fashion
6Testing
Backwashing depth, inlet and outlet volume
Tubing depth during waiting for setting, waiting for setting time. 6.1 Operation preparation
Prepare the repairing fluid.
6.1.2 The cement truck meets the pump pressure and displacement requirements for construction. 6.2 Operation procedures
6.2.1 Lower the test string to the designed position. The string structure is the same as that of 4.3, 1, 5. Connect the cement truck pipeline and test the pressure according to the design requirements. 6.2.2E
Verify the plugging effect according to the provisions of 4, 3, 2, B. 6.2.33
6.2.4 Adjust the string and check the reliability of the packer, string and data according to the provisions of 4.3.2.5. 6.3 Operation quality requirements
The construction string structure and completion depth should meet the design requirements. 6.3.2
The test string packer and string should be sealed and intact. 6.3.3
The injection volume, return volume or casing pressure change measurement and recording during the delay of the oil pipe pressurization should be accurate. 6.3.4
When testing the string, if there is no overflow or casing pressure change under normal production level 1, the string is considered qualified. Data collection content:
Test string string structure and running depth;
Verify the layer position, section #
pressure value, injection volume, return volume or casing pressure change value; d.
Tubing and packer leak test results.
Basic laying
Completion date
Artificial well bottom, shift
Diameter, mm
Cementing quality
Productivity of oil layer, force
Well section, m
Degree of good management and brief description of previous operations
IV. Construction number
Well clearance specification × length, mm
Name of washing (pressure) well fluid
Amount of washing (pressure) well fluid, m
Find the series section, buckle
Measure the depth of the instrument, m
V. Well construction step
SY/T 5587.8--93
Amplitude measurement and string finding design
(Supplement)
Drilling depth,
Oil compensation distance, m
Wall thickness, m
Daily oil production, t
Inner diameter, mm
Cement return height, Ⅲ
Daily water production, m8
Passing depth, n
Washing (jade) common liquid performance
Washing (pressure) well depth, m
Measurement instrument name (model)
Down depth, m
Forming pressure, MPa
VI. Safety attention rate item
SY/T 5587.8-93
Designer
Reviewer
Approver
Basic data
Completion date
Artificial-bottom, m
True diameter, mm
Suitability and quality
Brief information of blue and finding interval
Production situation
Perforation section, m
SY/T 5587.B—93
Appendix B
Isotope measurement and string finding design
(Supplement)
Complete station block depth, m
Oil compensation distance, m
Production, t
Brief description of previous operations and the current well string structure III. Construction steps
Density:
Drilling well (sand flushing) to
Inner diameter, mm
Water return height, m2
H() water. m\
m Repair and wave positive (reverse) wash (positive) 30, wash (pressure) well depth viscosity:
Measure radioactive baseline.
Connect import and export pipelines. Import pipeline and parallel port test MPa, stable
Test squeeze with water. Test squeeze pressure
Prepare isotope liquid
Inject from the oil pipe
mPa-s,
MPa, stable absorption is not less than
.n\. Isotope name:
After preparing the isotope with concentration
m", close the casing gate and squeeze the metatope liquid for min, then backwash the well. Well washing fluid name:
m*, washing depth
Pull out the pipe string in the well. (Pull up the pipe string to
Lower the logging instrument (model
) to the well depth
Pull out the logging instrument and interpret the results.
ni, for ||tt ||Relative density:
Lower water, m
Ground pressure, MPa
m. Well repair qualification:
min is qualified.
L/min.
My/m.
Viscosity:
mSearch for string in parallel.
IV. Schematic diagram of construction pipe string
V. Safety precautions
SY/T 5587 8—93
Designer
Examiner
Approver
Basic data
Later stage of completion
Artificial well bottom, m2
Vertical, mm
Solid mass
II. Brief description of the layer section to be found
Production situation
Perforation section, m
SY/T 5587 8—93
Appendix C
Design of packer location
(supplement)
Drilling depth, m
Oil compensation distance, m
By original, mm
From production oil load,
Brief description of previous operations and current well string construction parameters
Search string method
Observation hole and section, m
Name of pressure (washing) opening fluid
Test value of imported pipeline, MPa
Test location of sealing string, m
IV. Schematic diagram of construction pipe string structure
Inner diameter, mm
Mud return, m
Maximum water production (injection), *
Maximum string search, m
Depth of lifting scraper, blood
Pressure (washing) and liquid properties
Pressure test stabilization time, min
Total amount of string search liquid, ma
Depth, m
Layer force, MPa
V. Construction steps
SY/T 5587.8-93
Designer
Reviewer
Approver
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