The BZ341 oilfield CEPA platform is located in the southern part of the Bohai Bay and is part of the Jizhong oilfield group. The water depth is about 20m. The BEPA platform of the BZ341 oilfield is responsible for the oil and gas collection and treatment of the entire Suizhong 34 oilfield, and is responsible for the power supply and water injection support of other platforms in the Suizhong 34 oilfield. . At this stage, the oil, gas and water of the Suizhong 34 oilfield group are treated by the CEPA platform of the BZ341 oilfield, and the crude oil is transported to the friendship and storage. The natural gas is used as a fuel gas for the turbine and the heat medium boiler, and the rest is passed through the torch. The system is vented and burned out. According to the prediction of natural gas production in the Suizhong 34 oilfield group, the natural gas geological reserves are 1683.108 m3 (gas layer gas + dissolved gas), which is rich in natural gas resources. The recoverable reserves of natural gas are 976.10 8 m 3 (gas layer gas + associated gas), of which the platform self-use gas is 46.10 8 m 3 and the remaining natural gas is 516.108 m3. At present, the platform produces about 21.104 m3 of natural gas per day and 69.104 m3 /d of self-use natural gas. If the remaining natural gas resources are emptied from the flare system, it will cause great waste. In view of the above situation, in order to ensure the normal use of gas by the host, in order to respond to the energy conservation and emission reduction advocated by the state since 2007, the remaining natural gas resources of the Suizhong 34 oilfield group should be rationally utilized. Through investigation and research, a new gas injection compressor unit was prepared to pressurize the remaining associated gas and then re-inject it into the underground of the CZ platform of BZ341 oilfield. This can re-inject the remaining associated gas into the well for gas flooding to achieve the purpose of oil displacement and production increase. The follow-up plan for this scheme is that after the BZ282S oilfield (new oilfield) is completed and put into operation, the remaining associated gas will be transported to the BZ282S oilfield through the submarine pipeline. In response to the above problems, it was decided to add a gas injection system to the CEPA platform of the BZ341 oilfield. 2 Analysis before the implementation of the project. 21 analysis of process design. 211 gas injection conditions. In order to make full use of associated gas and save energy, the CZ platform of BZ341 oilfield fully utilizes the original two associated gas compressors (for turbo fuel gas pressurization, outlet pressure 27MPa), consider adding one medium-pressure compressor and 1 The high-pressure compressor, the medium-pressure compressor and the high-pressure compressor are operated in series. When the turbine main engine is used, the remaining associated gas is injected into the ground through the compressor to achieve the purpose of increasing oil production. The two new associated gas compressor units will be placed in the reserved area of ​​the middle deck and the lower deck of the CEPA platform of the BZ341 oilfield. The new methanol injection enthalpy, low pressure storage tank, seawater heat exchanger and inlet scrubber are placed in the middle deck reserved space. New high-pressure storage tanks, gas injection filters and gas-filled air coolers are placed in the reserved space near the new high-pressure compressor. The newly added compressor inlet seawater cooler and fuel gas scrubber are designed to meet the gas requirements for turbine and gas injection. After the associated gas is cooled by the seawater cooler and the fuel gas washing tank, it enters the newly added low pressure gas injection compressor and the two fuel gas compressors are compressed to 27 MPa. Under normal conditions, a new low pressure gas injection compressor and two fuel gas are added. The compressor is running at the same time; when one of the fuel gas compressors fails, the gas injection volume is reduced to meet the turbine main engine gas consumption. After the low pressure compressor is pressed to 27MPa, the fuel gas is buffered by the low-pressure buffer tank, and then compressed to 25MPa by the high-pressure gas injection compressor. The compressed natural gas enters the buffer of the newly added high-pressure gas storage tank, and is injected into the formation after metering. After the transformation, the remaining associated gas is cooled from the outlet of the primary separator (CEPAV2001) through the new low-pressure gas cooler (CEPAWC MD2801), and enters the new low-pressure scrubber (CEPAVMD2801) to enter the new low-pressure gas injection compressor. CEPAC MD2801) and the original two fuel gas compressors (CEPA3201A/B) are compressed to 25MPa into the new low-pressure gas storage tank (CEP AVMD2802) buffer, and then compressed to 25MPa by the new high-pressure gas injection compressor (CEPACMD2802), compressed The natural gas enters the buffer of the newly added high-pressure gas storage tank (CEPAVMD2803), and is metered into the well A3. The process of gas injection conditions is: primary separator (CEPAV2001) # new low pressure gas injection cooler (CEPAWC MD2801) # new low pressure gas injection scrubber (CEPAVMD2801) # new low pressure gas injection compressor (CEPACMD2801) And the original fuel gas compressor (CEPAV3201A/B) #New low pressure gas injection storage tank (CEPAVMD2802) #New high pressure gas injection compressor (CEPACMD2802) #New high pressure gas injection storage tank (CEPAVMD2803) #A3 well well production tree. The renovation includes: the addition of two gas injection compressor units CEPACMD2801, CEPACMD2802, one gas injection scrubber CEPAVMD2801, one gas injection cooler CEPAWC2801, two gas injection storage tanks CEPAVMD2802, CEPAV MD2803, one methanol injection CEPAXMD3621, a service valve group CEPAPICMD2001, adds process piping, instrumentation, electrical, structural, safety/fire protection facilities related to the above equipment. In addition, considering that it does not affect normal production, an 8in (1in = 254cm) spare line is provided downstream of the primary separator and the new pressure regulating valve at the outlet of the primary separator. When the original regulating valve fails, the valve can be opened here. For the subsequent fuel gas system gas; the raw fuel gas compressor and the new low-pressure gas injection compressor inlet and outlet respectively have a communication line, when the original fuel gas cooler or scrubber fails, can be cooled by adding low-pressure gas injection The scrubber and the scrubber liquefy the original fuel gas compressor to meet the turbine main engine gas; when one of the fuel gas compressors fails, the gas injection volume is reduced, and the turbine main gas is preferentially used, and when the low pressure gas is injected When the compressor fails, the SDV valve on the front and rear connecting lines of the original fuel gas compressor is closed and isolated from the fuel gas production system. When the upstream air supply is insufficient, in order to ensure the stable operation of the compressor, a relevant line that can be returned to the low-pressure gas injection scrubber is provided at the outlet of the newly added low-pressure gas storage storage tank; the outlet of the high-pressure gas injection storage tank is set to return to the low pressure. Pipeline for gas injection storage tanks. In order to maintain the pressure of the newly added low pressure and high pressure gas injection storage tanks, a pressure regulating valve is added at the tank outlet to depressurize the excess associated gas and then vent the torch. 212 outside the working conditions. In the future, when the BZ282S is put into production, the high-pressure gas injection compressor and the high-pressure gas injection storage tank will be hoisted, and the excess associated gas will be compressed by the low-pressure gas injection compressor and then transported to the BZ282S oil field through the laid submarine pipeline. The process of the external transmission condition is: primary separator (CEPAV2001) # new low pressure gas injection cooler (CEPAWC MD2801) # new low pressure gas injection scrubber (CEPAVMD2801) # new low pressure gas injection compressor (CEPACMD2801) And the original fuel gas compressor (CEPAV3201A/B) # new ball valve (CEPAPICMD2001) # submarine pipeline outside the BZ282S oil field. 22 new system. Through the HYSYS simulation calculation, it is found that some of the high-pressure pipelines of the newly-injected compressor block will have hydrates at the restrictor orifice plate and the valve due to the sudden drop of gas pressure in the pipeline. In response to this situation, a methanol injection system was added to ensure safe production of the platform. 23 security measures. The newly added equipment layout has no effect on the division of the original platform fire zone. In the newly added equipment area, the fire water spray is added, the pipeline is connected with the fire water loop of the CEPA platform, and the fusible plug loop is used to protect the newly added equipment area from high temperature. Control the corresponding spray valve and add corresponding fire protection equipment near the new equipment layout. 3 design basis, principle, scope. The design basis of the natural gas reinjection project of BZ341 oilfield has the following four aspects: the summary of the technical clarification meeting of the BZ341 oilfield associated gas export project tender (February 1, 2008); the analysis of natural gas components provided by the Bohai Petroleum Research Institute laboratory Report; & BZ341 oilfield CEPA platform detailed design information. International and domestic relevant standards and specifications for current offshore oilfield production facilities. The design principles are as follows: Make full use of the existing facilities of the BZ341 oilfield to reduce the investment in engineering construction; % of the materials selection and equipment selection of each specialty are basically the same as the original design of the BZ341 oilfield; & the current relevant design standards and specifications are strictly implemented in the design. The project design scope includes: 2 new gas injection compressor units CEPACMD2801, CEPACMD2802; 1 gas injection scrubber CEPAVMD2801; 1 gas injection cooler CEPAWC2801; 2 gas injection storage tanks CEPAVMD2802, CEPAV MD2803; 1 methanol injection CEPAXMD3621; 1 service valve group CEPAPICMD2001; added process piping, instrumentation, electrical, structural, safety/fire protection facilities related to the above equipment. 4 project implementation content. The implementation contents of the project are as follows: Entrust the oilfield construction service company's facility transformation branch to construct the part of the project involving the transformation of the platform; the % operation area purchases 2 compressors produced by Sichuan Tongda Machine Company; & is responsible for the wellhead by the drilling and completion project team. The purchase and installation of the tree; the welding and installation of the ground process pipeline of the tree by the CNOOC Engineering Maintenance Branch; (the platform director is responsible for coordinating the work of the relevant units. The project was launched in February 2008, through various aspects. Working together, on the morning of June 1, 2008 0) 00 was successfully put into operation as scheduled. During the implementation of the project, the 512 Wenchuan 80 earthquake was encountered, and the high-pressure buffer tank of the gas injection compressor ordered by the Sichuan manufacturer could not arrive at Tanggu as scheduled. In response to this situation, the operation area actively organizes technical experts from all sides to fully analyze the actual situation of the site. After the investigation, scientifically and boldly propose changes to the design, temporarily cancel the installation of the buffer tank, reserve the interface, and wait for the buffer tank to arrive. Then install it again. During the commissioning process, it was found that the inlet pipeline of the high-pressure machine showed strong jitter. In response to this problem, the operation area actively communicated with the manufacturer, discussed with the parties, proposed a solution, and finally increased the facilities through the inlet of the gas injection compressor. Solved the problem of pipeline jitter. After the normal operation of the gas injection compressor, the on-site operator analyzes the process, explores and adjusts the amount of each methanol injection point, and finally adjusts the methanol dosage from 70L/d to 30L/d. After half a year of on-site construction and reconstruction, the BZ341 oilfield carried out a natural gas loading test on the gas injection system on May 31, 2008. After successfully pressurizing the rich natural gas to 15 MPa or more through the new gas injection compressor, it successfully passed the A3 well. Reinject into the formation. It is estimated that the annual safety of the equipment will be 4,381.04 m 3 . Since May 31, the gas injection system has been put into operation normally, and has reached the design requirement of 165.104m3 of natural gas per day. The accumulated natural gas volume is 333563.104m3, which directly saves more than RMB 60 million, achieving energy saving and emission reduction and reducing greenhouse gases. Emissions and noise caused by the burning of the torch on site and to a large extent ensure the normal safety production activities of the platform.
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New oilfield hollow press re-injection application
1 Overview.