SY/T 5587.9-1993 Procedure for replacing wellhead equipment during routine workover of oil and water wells

SY/T 5587.9-1993 Conventional well repair work for oil and water wells. Procedure for replacing wellhead equipment. SY/T5587.9-1993 Standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T5587.9--93
Routine well repair work for oil and water wells
Operation procedures for replacing wellhead devices
Published on September 9, 1993bzxz.net
China National Petroleum Corporation
Implementation on March 1, 1994
1 Subject content and applicable standards
Petroleum and Natural Gas Industry Standard of the People's Republic of China Routine well repair work for oil and water wells
Operation procedures for replacing wellhead devices
SY/T 5587.8-93
This standard specifies the preparation, operation procedures, quality requirements and inspection for the removal, replacement and cutting and welding of wellhead devices. This standard applies to the operation and construction of replacing wellhead devices in oil, gas and water wells. 2 Reference standards
SY/T5587.3 Conventional well repair and well pressure replacement and blowdown operation procedures for oil and water wellsSY/T5587.16 Well cleaning and casing scraping operation procedures for oil and water wells with standard repair and well cleaning3 Technical rumors
3.1 Replacing wellhead equipment
Any operation process that can change the model, height, position and shape of the wellhead device without using electricity or gas welding. 3.2 Cutting and welding wellhead equipment
The operation process that can change the model, height, position and shape of the wellhead device only by using electricity or gas welding. 4 Operation preparation
4.1 Data preparation
The repair unit shall fill in the repair form with basic information and requirements and submit it to the construction unit. 4.2 Material preparation
The construction unit shall inspect the new wellhead device to be sent to the wellhead site according to the requirements for replacing the wellhead device. 4.3 Site preparation
4.3.1 The wellhead must be kept stable to meet the construction requirements. 4.3.2 Clean up the debris around the wellhead to meet the requirements for replacing the wellhead device. 4.3.3 If the wellhead device needs to be cut and welded, the construction site must be equipped with corresponding electric and gas welding equipment and materials. 5 Operation procedures
5.1 Check, measure, and record the relevant data and specifications of the flange nipple, cross and tubing head of the new wellhead device. 5.2 When replacing the wellhead device, the original wellhead device should be removed from top to bottom as required, and then the new wellhead device should be installed from bottom to top. When cutting and blasting the wellhead device, the original wellhead device should be cut off first as required, and then the new wellhead device should be welded. 5.3 Re-check the sleeve compensation distance and oil compensation distance.
5.4 Clean up the debris around the wellhead: meet the requirements for handover. 6 Operation quality control and safety requirements
Approved by China National Petroleum Corporation on September 9, 1993, implemented on March 1, 1994
6.1 Quality control
SY/T 5587.9-93
6.1.1 The casing four (or three) should be kept horizontal. The parallel port device should be vertical, with a vertical error of ±2° and a concentricity error with the wellbore of no more than 2mm
6.1.2 The handwheel direction should meet the design requirements. When replacing the wellhead device, if the flange on the casing is welded and cannot be rotated, the handwheel direction adjustment error is allowed to be ±15°. If the flange on the casing can be rotated, the handwheel direction error is allowed to be ±3°. When cutting and welding parallel ports, the handwheel direction error is allowed to be ±3\.
6.1.3 The parallel port bolts should be evenly stressed, and the upper screw should not be higher than the nut plane by 3m. 6.1.4 Four 90° uniformly distributed reinforcing ribs shall be welded at the weld joints of the cutting and welding parallel ports. The size of the reinforcing ribs shall be 100mm long, 80mm sparse and 7mm thick.
6.1.5 The allowable error of the casing compensation distance and oil compensation distance calibration is ±5mm. See Appendix A (Supplement) for the calibration method. 6.2 Safety requirements
6.2.1 If cutting and welding parallel ports are required, the construction site shall be equipped with fire prevention and explosion prevention facilities, and corresponding fire prevention and explosion prevention measures shall be formulated. 6.2.2 Before using electricity and gas, the construction unit shall go through the parallel ports fire procedures in accordance with regulations, and report to the relevant departments for approval before construction.
6.2.3 When cutting and welding parallel ports, it must be ensured that there is no oil or gas display at the wellhead. 6.2.4 If the casing wall is thick, the butt welding method can be used. For thin-skinned or severely corroded casing, the sleeve welding method should be used for parallel ports. 6 Operation quality indicators and inspection methods
7.1 Operation quality indicators
7.1.1 The new parallel port device should meet the design requirements and purposes.
1.2 When it is necessary to press and merge, it should comply with the provisions of SY/T5587.3.
1.3 Data collection should include:
a. Specifications and lengths of the oil layer casing short joints
b. Dimensions and specifications of the new wellhead device
c. After replacing the wellhead device, the height of the casing flange increased or decreased and the new casing compensation distance and oil compensation distance; d. Inspection of the weld of the new parallel port device (including pressure test medium, pressure test data, pressure test time, pressure stabilization time, pressure drop and sealing effect of the parallel port device).
7.2 Operation quality inspection method
7.2.1 After replacing the wellhead device of oil and water wells, use clean water to test the pressure to above 15MPa (or 1.5 to 2 times of the actual working pressure). After 30 minutes, check that the pressure drop is not greater than 0.5MPa. 7.2.2 After replacing the wellhead device of gas wells, an airtightness test should be carried out, and the test pressure should be 1.5 to 2 times of the parallel port working pressure. 7.2.3 The replaced parallel port device should be ventilated according to SY/T5587.16. 2
Schematic diagram of casing compensation distance and oil compensation distance
SY/T 5587.9—93
Appendix A
Schematic diagram of casing compensation distance and oil compensation distance verification
(Supplement)
Figure A1 Schematic diagram of casing compensation distance and oil compensation distance
1-Drill plate bushing surface: 2-Cross: 3-Flange short section: 4-Casing head: H1-casing compensation distance; H2-oil compensation distance. A2 Verification formula of casing compensation distance and oil compensation distance
A2.1 Correction formula of casing compensation distance
H =h+(Li—L2)
Where: HI--casing compensation distance after verification, m#--original casing compensation distance,
L,--the distance from the original casing to the casing flange, msLz--the distance from the newly welded casing to the casing flange, m. A2.2 The verification formula of oil filling distance is:
- the oil filling distance after verification, ms
wherein H.~
Hi—the casing filling distance after verification, m:
L3—the distance from the flange surface of the new welded casing to the upper plane of the cross or tee, I1. Additional remarks:
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 and its subordinate operations department. The responsible drafters of this standard are Xiao Gaoyi and Ge Xinming. (A1)
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