Application Status of Compressor Gas Lift Drainage Gas Production Process in Weibei Gas Field
Table 1 compressor performance parameters project parameter name detailed description equipment operating environment adapt to the environment oilfield operating environment ambient temperature a 3440 altitude <2800m maximum humidity 80% continuous running time continuous working clutch transmission parameter model SL250 (hydraulic pressure clutch transmission) input speed 12001800RPM input shaft power 220KW1800RPM lubrication form oil lubrication (15W-40) lubricating oil cooling form air cooling transmission mode direct connection transmission speed ratio 11:1 (input and output shaft same rotation direction) speed ratio 21.33:1 (input and output shaft same direction Supercharger unit technical parameters compressor model KNOX- WESTERNE2430 compression medium natural gas rated displacement 1600 丽 3/HH design suction pressure 3. 0MPA rated exhaust pressure 3.0MPA25MPA compression series 3 input shaft speed 900RPM1800RPM input shaft power 208. 7BHP lubrication form with oil lubrication (Lalishi 827) cooling form air-cooled transmission mode direct connection (high elastic coupling WV-FLM-840) flywheel model 2-20729-001 engine model ohmin (LXBXH) weight 16500KG control system Control mode automatic + manual control ordinary container digital mode control + mechanical control booster explosion-proof lubricating oil heater often
There are three types of optional gas sources for the gas pumping of the booster in the north of the gas field: the reinjection of the gas in the well: the gas in the well is the gas source produced by the gas well as the gas source is pressurized by the supercharger. The oil sump is recirculated into the well through the annulus, and the bottom hole effusion is discharged from the oil pipe. For low-yield wells and flood-discharged production wells, the gas volume of the well is small and the water content is high, which cannot meet the requirements of the gas source. Therefore, such wells are not considered as compressed gas sources.
Gas produced in the adjacent well: the gas in the adjacent well is in the block with normal production well conditions. The gas produced by the adjacent well is pressurized by the supercharger and then used as a high-pressure gas source for continuous gas lift production. It is required that the distance between the gas source well and the gas lift well should not be too long, and the supercharger equipment is required to have a good sand and water separation device. Because there is a certain amount of excitement and back pressure damage to the formation during the gas lift process, the smooth control of the gas lift process should be strengthened to reduce the impact on the formation.
Counter-gas transmission in the station: The anti-gas transmission in the station is to use the natural gas after dehydration and separation in the gas collection station as a gas source, and then deliver it to the supercharger equipment for supercharging, and then perform gas lift production. Because the gas source sent by the counter-gas transmission in the station is dry gas, there is no need for the compressor equipment to separate the sand water, and at the same time, it will not cause the excitement of the gas source well, compared with the gas of the well and the gas of the adjacent well. It is more suitable as a gas source, but it needs to be modified.
Positive lifting: gas is injected from the oil pipe, and the liquid in the well is returned by the oil jacket. This method has the advantages of short-time high-pressure gas reaching the shoe, short working time of high pressure, low pressure of required gas source, but also gas. The shortcomings of incomplete emptying and large loss of wellbore slippage are mentioned.
Counter-lift: Injecting gas from the oil jacket annulus, the fluid in the well is discharged by the oil pipe. Compared with the positive lifting, the high pressure gas reaches the tube shoe for a long time, the high pressure operation time is long, and the required air source pressure is also high, but the hollowing degree is thorough and the oil pipe slippage loss is small.
Positive and negative lifting method selection: The general gas lifting process mainly adopts the counter-lifting method. The main reason is that when the pumping pressure and the pressure of the gas in the well are the same, the gas volume is reduced by the reverse pressure, the oil pipe slippage loss is small, and the hollowing degree is completely However, due to the high pressure of the required gas source, the large amount of liquid in the gas well cannot be effectively restored by this method. To this end, before the gas lift operation, the gas lift method should be reasonably selected according to the height of the wellbore liquid column.
The selection criteria for the gas lift method can be calculated based on the wellbore pressure balance relationship. Assume that the oil jacket pressure before the gas lift operation is Pt, Pc, oil, casing! The height of the inner liquid column is hi and h2 respectively (see). According to the pressure balance relationship in the wellbore, the premise of achieving the gas lift induced spray is that the gas source pressure is greater than the bottom hole flow pressure when the gas reaches the tube shoe. Assuming that the pressure of the air source is P, the conditions for the reverse stimuli are realized: (2) There is a valve gas lift, no valve gas lift process, no valve gas lift, and only one oil pipe in the well.
The gas lift valve discharges a production pipe column to install a gas lift valve, and the stepwise staged pressurized gas lift. For gas wells with wellhead pressure caused by wellbore effusion, there is no self-spraying ability to discharge the effluent to resume production. It is necessary to rely on the pressurized gas to discharge the wellbore effluent and the liquid entering the formation, and the gas injection when the supercharger lifts the liquid column. The pressure is generally high, and it is easy to cause the formation to invert. In addition, when the oil pipe is inserted into a gas well with a deep depth, it is difficult to empty the wellbore at one time when the supercharger gas is lifted. The multi-stage gas lift valve is used to lift the wellbore liquid column step by step, which can effectively reduce the starting pressure of the deep well drainage. Avoid or reduce damage to the formation caused by excessive back pressure.
There are valve gas lift and valveless gas lift mode options: It can be seen that there are valve gas lift and valveless gas lift compared with the following characteristics: d, installation gas lift valve generally requires lower control gas injection speed, So as not to stab the gas lift valve.
e. If the well with the gas lift valve is installed, the semi-closed gas lift and the fully closed gas lift are used. Because the packer is placed in the well (positive lift) or the bottom of the tubing is blocked (reverse lift), the gas injection space is The well bottom layer is separated to prevent the gas injection pressure from being higher than the formation pressure, and the gas is injected into the production layer so that the water in the oil pipe cannot be discharged.
199 based on the above characteristics A valveless gas lift can be used for ground laminatingH tidal press machine valve gas lift schematic http:// higher gas well for gas lift liquid extraction, or gas well return after operation row. The valve gas lift method is suitable for gas lift drainage and gas drainage with large liquid accumulation and low formation pressure.
(3) The structure of the pipe string is selected to open the gas lift: there is no other change in the oil pipe except the gas lift valve. Suitable for flooded wells with high formation pressure, also known as conventional gas lift.
Semi-closed gas lift: The lower packer (positive lift) or the bottom of the tubing (reverse lift) separates the gas injection space from the comparison of the valve gas lift and the valveless gas lift start process. Suitable for flooded wells with low formation pressure.
Fully closed gas lift: the inner and lower packers of the casing; the oil pipe shoe has a single flow valve, gas and water can enter the oil pipe, and the water in the oil pipe cannot be returned to the bottom of the well. When the water in the oil pipe is lifted out, when the internal pressure of the oil pipe is less than the formation pressure, the single flow valve is opened, and the gas water enters the oil pipe and is continuously lifted out of the wellhead. Suitable for flooded wells with lower formation pressure.
Jet type gas lift: a jet pump is installed on the bottom of the oil pipe on the basis of the semi-closed gas lift device, and the injected high pressure gas is sprayed upward through the injection pipe to form a suction to the bottom of the oil well to further reduce the bottom hole flow pressure and improve The water carrying capacity of the gas.
Test situation and conclusions In order to restore the production of water flooding production wells and solve the problem of gas well returning after underground operation, in 2012, the Weibei gas field carried out a total of the wells and the i4 wells. The gas is returned to the row test.
Table 2 2012 supercharger gas lift test situation statistics serial number construction type construction time gas source remarks station reverse gas transmission successful return operation adjacent gas well interconnection casing damage, gas lift pressure does not rise adjacent well gas interconnection gas source sand The treatment of water is not completely caused by the reverse gas transmission in the shutdown station. The reverse gas transmission in the gas station is reversed (by the performance limit of the supercharger). The reverse gas transmission in the resumption production station is intermittent gas lift (limited by the performance of the supercharger) Test conclusion: The overall effect of the test is good, and the water-flooded well can be restored to production.
The supercharger separation system has poor treatment effect on sand and water, the equipment is unstable, and it is easy to stop, and further modification is needed.
Due to the performance limitations of the supercharger, continuous gas lift cannot be achieved.
1 Liu Wei (2089-3! Female a Qinghai Oilfield Natural Gas Development Company 涩3 North No. 1 gas production area gas production, telephone (1.http://
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