Some standard content:
SY/T5588-93, Petroleum and Natural Gas Industry Standard of the People's Republic of China
Technology and Practice of Water Injection Well Adjustment
Published on September 9, 1993
China National Petroleum Corporation
Implementation on March 1, 1994wwW.bzxz.Net
Subject Content and Scope of Application
Technology and Practice of Water Injection Well Adjustment in Petroleum and Natural Gas Industry Standard of the People's Republic of China
SY/T 5588--93
This standard specifies the construction preparation, construction design, operation procedures, operation safety and quality control and data collection of water injection and adjustment technology.
This standard is applicable to the adjustment of water absorption profile of water injection wells in water injection development reservoirs. 2 Reference Standards
SY/T×××× Method for evaluating the effect of water injection well adjustment in sandstone oil reservoirs. 3 Method Summary
Control a certain injection pressure, inject the profile control agent with specific physical and chemical properties into the high water absorption layer and high permeability layer of the water injection well, form a certain strength of plugging, and adjust the water absorption difference along the longitudinal surface of the water injection well. 4 Preparation work before the profile control construction
4.1 Well selection
a. Water injection wells inside the reservoir,
b. Water injection wells with large vertical permeability differences and high water absorption layer sections, C. The cementing quality of the water injection well is qualified, and the oil wells with no cross grooves in the profile control layer have high water content in the corresponding oil layer.
4.2 Prepare the profile control construction design
Prepare the profile control construction design according to the quality plan. The format of the construction design is shown in Appendix A (reference). 4.3 Select the profile control agent
4.3.1 Determine the type of profile control agent to be used according to the formation temperature, oil layer lithology, liquid physical properties, water type and expected treatment radius of the water injection and profile control layer.
4.3.2 The profile control agent should have the characteristics of good pumpability, strong plugging ability and good thermal stability. 4.4 Downhole tools for dynamic pipe string construction
a. Tongbingwei,
b. Packer:
C. Ball seat and ball
d. Throttling equipment.
4.5 Ground equipment
a. Liquid distribution container or liquid transfer joint vehicle;
b. Construction vehicle group
c. High-pressure manifold.
Approved by China National Petroleum Corporation on September 9, 1993 and implemented on March 1, 1994
5 Construction design
5.1 Construction parameters
5.1.1 Profile control agent injection volume
Design calculation formula for injection volume.
In the formula, Vi is the squeeze volume, m*,
pi (take 3.14)
h;——the thickness of layer i, ms
middle—the effective porosity of the layer, decimal, r: the treatment radius of the layer, m.
5.1.2 Pre-fluid volume
The pre-fluid volume is 5~～15m.
5.1.3 Displacement fluid volume
Design calculation formula for displacement fluid base:
SY/T 5588—93
V-V+V++Vs+V
, V—displacement volume, m\,
Vs—surface manifold volume, m\,
V pipe string volume, m\;
Vs—the volume of the inner ring of the packer rubber cylinder, m\, and V—additional displacement fluid volume.
5.1.4 Squeeze pump pressure
The squeeze pressure should be controlled below the formation fracture pressure to prevent the water layer from being compressed. 5.1.5 Average squeeze injection displacement
The design of average squeeze injection displacement should satisfy the following formula Vi+V
Where: 91——Designed average displacement of squeeze injection profile control agent, L/mint——Pumpable time of profile control agent, min. 5.2 Pumpable time of profile control agent
5.2.1 Pumpable time of profile control agent is greater than squeeze injection time. 5.2.2 The preparation amount of profile control agent is slightly larger than the designed injection amount. 6 Operation procedure
6.1 Wellbore preparation
6.1.1 Construction of fixed pipe
6.1.1,1 Use injection water to backwash the well to the same water quality as the inlet and outlet. 6.1.1.2 Cast and salvage the injection nozzle.
6.1.1.3 Water injection for 2~ 4 days
6.1.1.4 Measure the water injection indication curve, pressure drop curve and water absorption start pressure, and calculate the water absorption index of the adjustment layer. 6.1.2 Moving pipe string construction
Pull out the water injection pipe string.
SY/T 5588--93
Put the pipe string to the bottom of the well, and flush the sand to the bottom of the well if there is sand. 6.1.2.2
Insert the construction column according to the design requirements of the adjustment part, seal it, and install the pipe port. 6.1.2.33
6.1.2.4 Use the injected water to backwash the pipe until the water quality at the inlet and outlet is the same. 6.1.2.5
Water injection for 2~4 days.
Measure the water injection indication curve, pressure drop curve and water absorption start pressure, and calculate the water absorption index of the adjustment layer. 6.1.2.6
6.2 Wellsite layout
Place various liquid preparation (or liquid transfer) containers, equipment and construction vehicles, and connect various pipelines and manifolds. 6.3 Equipment test run and manifold pressure test
Test the surface equipment, close the water injection gate, test the pressure to 25MPa, and the pipeline is not punctured or leaked. 6.4 Prepare the profile control agent
Prepare the profile control agent according to the preparation method of the selected profile control agent and the requirements of the profile control construction design. 6.5 Squeeze and inject construction
6.5.1 Test squeeze, observe the setting of the packer, and determine the squeeze pressure and displacement of the profile control agent. 6.5.2 Squeeze the profile control agent according to the requirements of the construction design. 6.5.3 Stop the pump after squeezing the replacement fluid according to the requirements of the construction design. 6.6 Shutdown
The construction record format is shown in Appendix B (reference). 7.1 Construction of the fixed pipe column after construction
7.1.1 The water quality of the water from the well to the inlet and outlet is the same. 7.1.2 Inject water for 3 to 7 days and observe the water injection status of the profile control layer after the profile control. Measure the water injection indication curve, pressure drop curve and water absorption start pressure of the profile control layer after the profile control, and calculate the water absorption index of the profile control layer. 7.1.3 According to the profile control geological plan, cast and pull the downhole water nozzle and inject in layers. 7.2 Construction of the moving pipe column after construction
7.2.1 Use the injected water to backwash the well to the inlet and outlet. 7.2.2 Inject water for 3 to 7 days and observe the water injection status of the profile control layer after the profile control. Measure the water injection indication curve, pressure drop curve and water absorption start pressure of the profile control layer after the profile control, and calculate the water absorption index of the profile control layer. 7.2.3 Lift the construction arm column.
7.2.4 Lower the layered water injection string and install the injection port. Use the injected water to backwash the well until the water quality at the inlet and outlet is the same. Make a good construction record, the format is shown in Appendix B (reference).
7.2.5 According to the geological plan, cast and salvage the downhole water nozzle and inject in layers. 8 Safety and quality control
8.1 Prepare the profile control agent with quality that meets the design requirements according to the standard of the selected profile control agent. 8.2 Continuous construction, accurate measurement, and control of reasonable squeeze pressure. 8.3 The well washing flow rate is controlled at 30~~35m/h
9 Data collection and collation
9.1 The same measurement method is used within three months before and after the profile control construction, and the water absorption surface of the water injection layer is tested under the same conditions. 9.2 After the profile control construction, the water absorption start pressure, water absorption indication curve and pressure drop curve of the profile control layer are measured under the same conditions, and the water absorption index of the profile control layer is calculated.
SY/T 5588—93
Record the comprehensive water injection data before and after the water injection well profile adjustment construction, and draw the water injection curve. Record the comprehensive production data of each corresponding oil before and after the adjustment construction, and draw the oil production curve of each corresponding oil group and the oil production curve of the well group. 9.4
Record the comprehensive development data of the group (or unit) before and after the adjustment construction, and draw the water drive characteristic curve of the group (or unit). 9.5
After the profile adjustment operation is completed, write a construction summary. The format is shown in Appendix C (reference). 9.6
The effect of the adjustment construction shall be evaluated according to the SY/T×××× sandstone oil layer water injection well adjustment effect evaluation method. 9,7
SY/T5588—93
Appendix A
Water injection and adjustment process and construction design format (reference)
Recommended size of profile adjustment construction design 1/16 A1
A2 The cover format and content of the profile adjustment construction design are as follows: Oilfield
Water injection well adjustment construction design plan
I. Profile adjustment layer number and section
2. Well section (m)
Construction purpose
III. Construction method
IV. Original data
1. Drilling completion date
Drilling date
Completion depth
Artificial well bottom
Casing depth
Cement return height
Deflection depth
2.Perforating data
and layer number
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Oil compensation distance
Forest pipe model
Minimum inner diameter of casing
Rat well quality
Oil layer data
Layer position and
4. Downhole string
date and depth,
diameter, mm
depth, twist
casing coupling depth of oil layer
current water injection situation
water injection section
sY/T 5588—93
algae density,
washing well
depth,
previous temperature
depth,
oil layer breaking
fracture pressure
tail pipe depth
daily water injection volume
V. Layer adjustment and its data
VI. Test data
1. Layer water volume test data
2. Water absorption surface test data
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Effective thickness
Permanent mouth diameter
Rock mineral
Material or fraction
Injection pressure
Injection volume
Water brother, %
Average pore throat
Following radius, μm
Injection volume
Relative
Water absorption per meter,
3. Corresponding oil and liquid production profile test data
VII. Formulation design of profile control agent
Material name
Concentration, %
VIII. Construction preparation
Liquid, m2
SY/T5588—93
Test date
per meter per day
1. Preparation of pre-pad fluid, profile control agent and displacement fluid Responsible construction unit:
Pre-pad fluid
Pre-displacement fluid
2. Preparation of tools and on-site process
Responsible construction unit:
Oil. m
Layered water content
Rate, %
Material name
Test method
All
Liquid production, m2
Amount, kg
All wells
Oil production, m2
Water content of the whole well
Rate, %
3. Preparation of construction equipment
Responsible construction unit:
IX. Design of squeezing parameters
X. Construction steps
1. Wellbore
2 Profile adjustment and injection
Injection fluid
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Injection pressure
Injection displacement
Injection time
Injection volume
XI. Work requirements
XII. Safety precautions
SY/T 5588—93
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