Method of well completion

 

The invention relates to the oil and gas industry, namely, development wells, including those equipped with a packer. Method of well completion includes the descent of the lift pipes with the packer to the well bottom and replace the mud on the lighter fluid. In the perforation interval is injected hydrocarbon liquid, raise the Elevator column with the packer up to the roof of the productive formation and perforined production casing. After that make cleaning of the bottom-hole formation zone method reverse leaching in different modes with maintaining back pressure on the reservoir in a closed loop with repeated washings in reverse order and leave a hole on the technological vistaico. Make an impact on the bottomhole formation zone method variables of pressure for 20 cycles. Washed well with maintaining back pressure, washing out the face pack, for at least two cycles. Cause the flow of formation fluids from the formation, spacerowa packer. In the well annulus download nadakarni liquid, and in the interval permafrost - non-freezing fluid and work well on the torch. The time of leaching in the process of cleaning the bottom hole C is 50 atmospheres. The magnitude of the depression in the stimulation and development of wells on the torch is chosen from the condition RPL>RZab0,7 PPLwhere RPL, RZabaccordingly reservoir and downhole pressure. Perforation of the production casing is made subject to the condition RZab~RPL. Reduced costs for development wells in its construction and maintenance due to elimination of pollution of bottom-hole formation zone of the filtrate of the drilling fluid and the additional impact on wellbore and near-wellbore area of the formation. 1 Il.

The invention relates to the oil and gas industry, namely, development wells, including those equipped with a packer.

There is a method of well development, including the descent of the lift pipes with packer, spacerowa packer, replacing the mud on the light, stimulation, development and testing of the well on the torch [Equipment for operation of gas wells. Directory M: CITIHOMES, 1982, S. 4].

The disadvantage of this method is the inability to develop deep well with AHP and low filtration properties due to incomplete cleaning of the bottom-hole zone from filtrate is Quain, includes descent lift pipes with packer, replacing the mud on the light, call flow, spacerowa packer [RF patent № 2109934].

The disadvantage of this method are the high investment costs for the development of deep wells with abnormally high pressure and low filtration properties in connection with the duration of the call flow from the reservoir, and at other times, and failure to receive the influx associated with incomplete removal of the filtrate of the drilling fluid when cleaning the bottom-hole formation zone and a lack of stimulation during the stimulation.

The challenge when creating the invention is to improve the reliability and effectiveness of well development.

Achievable technical result, which is obtained by the invention, is to provide conditions for stimulation of the formation with minimal capital and operating costs.

The task and the technical result is achieved by the fact that in the known method of development wells, including the descent of the lift pipes with packer, replacing the mud on the lighter liquid, a perforated production string, the call flow, spacerowa packer, unlike the prototype Elevator column with the lower packer to the well bottom, secno with the packer to the top of the reservoir, perforined production casing, produce cleaning of bottom-hole formation zone method reverse leaching in different modes with maintaining back pressure on the reservoir in a closed loop with repeated washings in reverse order, leave a hole for the process vistaico, produce effects on the bottomhole formation zone method variables of pressure for 20 cycles, washed well with maintaining back pressure, washing out the face pack, for at least two cycles, causing the flow of formation fluids from the formation, spacerowa packer, is injected into the well annulus nadakarni liquid, and in the interval permafrost - freezing liquid such as condensate, and work well on the torch, at the same time leaching in the process of cleaning the bottom-hole zone for each mode at least two cycles, reducing the pressure to produce stepped through 30-50 atmospheres, the amount of depression in the stimulation and development of wells on the torch is chosen from the condition of:

PPL> RZab0,7 PPL, (1)

where RPL, RZabaccordingly reservoir and downhole pressure, MPa,

and perforation of the service is expressed device for implementing this method.

The device includes a production casing 1, the Elevator pipe 2, a circulation valve 3, the packer 4, a landing nipple 5, downhole shutoff valve 6, is placed in a landing nipple, pumpkiny the shank 7, the shear valve 8, the Christmas tree 9, the compressor or pump unit 10, sadamoto 11 and flare 12 lines, choke device 13, the storage tanks 15 and collection of 16 technological solutions.

The method is implemented as follows.

In the production casing 1 lower Elevator tubes 2 with the circulation valve 3, the retainer 4, the landing nipple 5, podplacenym shank 7, the shear valve 8 to the bottom and is mounted on the mouth of the Christmas tree 9. With open valves 17, 18, 19 and closed 20, 21 mud density in the well through the annulus 22 and the Elevator pipe 2 is substituted for the light liquid, such as water. Presoviet production casing 1 together with the surface valves 9, replace the water in the aqueous solution of calcium chloride with density 1300-1350 m3/kg, is injected into the perforation interval hydrocarbon fluid, such as gas lift Elevator pipe 2 with the retainer 4 and other downhole obori washing in a closed loop or an aqueous solution of calcium chloride, any condensate punches type PR-43, R-54, the GOK-42S, IUP-48 with providing back pressure on the reservoir from the condition RZab~RPL. Shooting each Assembly punchers, their descent and ascent are made after you create on the mouth pressure, preventing the flow of formation fluids into the wellbore. Perhaps the use of drills pnct and water jet perforation.

After postilochnyh work cleaning the wellbore zone method reverse leaching with an aqueous solution of calcium chloride with maintaining back pressure on the different modes in the closed loop. The washing time for each mode is chosen from the condition RPL> RZab0,7 PPLbut not more than two cycles. Reducing back pressure is stepped through 30-50 atmospheres.

After removal of the mud filtrate and other solids from the wellbore and wellbore zone well is left on the technological vistaico within 24 hours with providing back pressure on the mouth on the basis of PZab~RPL= Py+10-5·W·N.

After that made an impact on the mi surfactants for 20 cycles; and then leaching face packs and rinsing the wells with pressure for at least two cycles. In the interval MMP pumped condensate when the following conditions are true: RZab~RPL=(Ry+10-5·W·N) < Rop EC. Well again left on the technological vistaico within 24 hours.

At the end technological vistani close valves 17 and 19, open valve 20 and the discharge of gas through the Elevator tube 2 and flare line 12, at end of which has threaded device 13, is made smooth start-up of the well with a pre-selected depression (due to installation fitting the calculated diameter). Upon receipt at the mouth of sustainable inflow (net gas) valve 20 is closed. Make spacerowa packer 4, into annulus 22 wells pumped nagakura liquid, for example an aqueous solution of calcium chloride density 1300-1350 kg/m3in the interval permafrost - condensate, and then again open the valve 20 and continue working out well at the torch.

Call flow out of the formation and development wells are subject to the conditions

PPL> RZab

When the well completion technology solutions of different density are served in the hole of the tank 15 and is displaced from the borehole technological solutions is collected in the vessel 16.

An example of spacerace packer after stimulation can serve as the next. In the tree 9 above the valve 21 is injected steel ball, push it in the Elevator pipe 2 Hydrogenium or inert gas (air) from the compressor. The ball sits on the saddle shear valve 8 and closes the flow cross-section of vacuum pipe 2. A gradual increase of pressure above the ball make spacerowa packer 4, i.e., seal the annulus 22 of the borehole sealing elements of the packer 4.

After working well on the torch is made necessary research complex in the landing nipple 5 is installed downhole shutoff valve 6.

The proposed method of development wells can reduce the cost of its development during the construction and repair by eliminating contamination of bottom-hole formation zone of the filtrate of the drilling fluid and the additional impacts on bottom and presque descent lift pipes with packer, replacement of the mud on the lighter liquid, a perforated production string, the call flow, spacerowa packer, characterized in that the lifting column with the lower packer to the well bottom into the perforation interval hydrocarbon fluid, such as gas lift Elevator column with the packer to the top of the reservoir, perforined production casing, clean the bottomhole formation zone method reverse leaching in different modes with maintaining back pressure on the reservoir in a closed loop with repeated washings in reverse order, leave a hole for the process vistaico, affect the bottomhole zone of the formation method of variable pressures within 20 cycles, washed well with maintaining back pressure, washing out the face pack, for at least two cycles, causing the flow of formation fluids from the formation, spacerowa packer, is injected into the well annulus nadakarni liquid, and in the interval permafrost non-freezing liquid such as condensate, and work well on the torch, at the same time leaching in the process of cleaning the bottom-hole zone for each mode at least two cycles of the key wells on the torch is chosen from the condition

PPL>RZab0,7 PPL,

where RPL, RZabaccordingly reservoir and downhole pressure, MPa;

and perforation of the production casing shall be subject to the conditions

PZab~RPL.

 

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