Method of well completion

 

The invention relates to the oil and gas industry, namely exploration wells with open face, including those equipped with a packer. Provides improved reliability and effectiveness of well development. The inventive method provide a descent lift pipes with packer, replacing the mud on the lightweight, spacerowa packer, the call flow. According to the invention the lifting column with the lower packer up to the roof of the reservoir. Replace the mud in the interval descent tubing string with a packer on a lightweight fluid with maintaining back pressure on the formation. Spacerowa packer. Descend into the well to the bottom through the Elevator column and zapakowany packer flexible pipe Koltunova installation. Replace the remaining downhole mud on a lightweight fluid with maintaining back pressure on the formation. Produce effects on the near-wellbore area of the formation method of variable pressures of aqueous solutions of calcium chloride or inorganic surface-active substances during the 20 cycles. Washed well with maintaining a back pressure of not less than two cycles, washing out the face pack. Cause the flow of formation fluids from the formation. Other liquid in the interval descent tubing string with a packer and downhole. For this mud density in the borehole, manual replace clay solutions with densities of 10-20% lower than the previous replaceable. Upload buffer fluid - technical water with carboxymethylcellulose in quantity equal to the volume of the cavity lift pipes, and then an aqueous solution of calcium chloride with the obligatory washing of the wells at each stage for at least two cycles and maintaining back pressure on the formation. The amount of back pressure on the formation is chosen from the analytical expressions. 1 Il.

The invention relates to the oil and gas industry, namely exploration wells with open face, 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 [Method development and operation of wells with the use of the packer and circulating valve. Inform. the leaf. M: VNIIEM, 1974. 20-74].

The disadvantage of this method is the inability to develop deep well with AHP and low filtration properties due to incomplete purification bottom consten method of well development, includes descent 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. The catalogue. 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 the filtrate of the drilling fluid and the 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 well development, including the descent of the lift pipes with packer, spacerowa packer, replacing the mud on the light, call flow, unlike the prototype Elevator column with the packer down to the roof of the reservoir, replace the mud in the interval spuckt packer, descend into the well to the bottom through the Elevator column and zapakowany packer flexible pipe Koltunova installation, replace the remaining downhole mud on a lightweight fluid with maintaining back pressure on the formation, produce effects on the near-wellbore area of the formation method of variable pressures of aqueous solutions of calcium chloride or inorganic surfactants for 20 cycles, washed well with maintaining a back pressure of not less than two cycles, washing out the face pack, cause the flow of formation fluids from the reservoir, remove the flexible pipe and work well on the torch, when replacing the mud on the light liquid in the interval descent tubing string with a packer and downhole do the following: the mud density in the borehole, manual replace clay solutions with densities of 10-20% lower than the previous replaceable, they fill the buffer fluid is water with CMC equal to the volume of the cavity lift pipes, and then an aqueous solution of calcium chloride with the obligatory washing of the wells at each stage for at least two cycles and maintaining back pressure on the reservoir, the magnitude of the buoyant force on �61.gif">WH)<PEC, (1) where RZab, RPL, Ryaccordingly downhole, the reservoir and the wellhead pressure, MPa;W- the density of the borehole fluid, kg/m3; H - depth of the lower hole punching, m; RopEC- pressure casing, MPa, and the amount of depression on the reservoir in the stimulation and development of wells on the torch is selected from the condition RPL> RZab0,7 PPL. (2) On the drawing schematically shows a device for implementing this method.

The device includes a production casing 1 with a perforated shank filter 2, the Elevator pipe 3, a circulation valve 4, the packer 5, a landing nipple 6, pumpkiny the shank 7, the Christmas tree 8, the compressor or pump unit 9, sadamoto (flow) 10 and flare line 11, nipple device 12, the storage tanks 13 and collection of 14 technological solutions, Koltunova installation 15 is wound on the drum, a flexible tube 16, block preventer 17, the injector 18, the guide groove 19.

The method is implemented as follows.

In the production casing 1 down Elevator active layer and mounted on the mouth of the Christmas tree 8. When open the valves 20, 21, 22 and closed on 23, 24 mud density in the well through the annulus 25 and the Elevator pipe step 3 is replaced by a lightweight, initially on a mud with a density of 1400 kg/m3then in an aqueous solution of calcium chloride with a density of 1200 kg/m3with the separation buffer pack technical water with CMC. The volume of the buffer stack is equal to the volume of the cavity vacuum tubes 3. This makes mandatory wash well in each stage for at least two cycles under the condition of PZab~ PPL= (Py+10-5WH)<PEC. At the end of the washing zone permafrost pumped condensate.

Then spacerowa packer 5 and descent to the bottom through the Elevator tube 3 and zapakowany packer 5 flexible tube 16 Koltunova installation 15. A flexible tube 16 is directed through the guide groove 19 in the injector 18, which through the block preventers 17 carry out its descent into the well. With open valves 24, 22, 21 and closed 23 cleaning the bottom and borehole zone method PR is utomo cycle. 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 3.0-5.0 MPa (30-50 atmospheres).

After removal of the mud filtrate and other solids from the wellbore, downhole, wellbore and near-wellbore zones of the formation, the well is left on the technological vistaico within 24 hours with providing back pressure on the mouth on the basis of PZab~ PPL= Py+10-5WH. After that made an impact on the near-wellbore area of the formation method of variable pressures of aqueous solutions of calcium chloride or inorganic surfactants for 20 cycles, and then leaching face packs and rinsing the wells with pressure not less than two cycles. In the interval permafrost pumped condensate when the following conditions PZab~PPL= (Py+10-5WH)<PEC. From the well is extracted flexible tube 16. Well again the left is advice 24 and 22, open valve 23 and the discharge of gas through the Elevator tube 3 and flare line 11, at end of which has threaded device 12, is made smooth start-up of the well with a pre-selected depression (due to installation fitting the calculated diameter). After obtaining a steady supply of produce development wells on the torch.

Call flow out of the formation and development of the wells is subject to the conditions RPL>RZab0,7 PPL.

At the completion of the formations with low permeability and porosity downhole pressure may be reduced to 35 MPa, at lower pressures possible irreversible changes in the reservoir, resulting in loss of productivity.

An example of spacerace packer can serve as the next. In a landing nipple 6 is installed blanking plug, which closes the flow cross-section of vacuum tubes 3. A gradual increase in pressure over the hollow tube produce spacerowa packer 5, i.e seal the annulus 25 of the bore of the sealing elements of the packer 5.

When the well completion technology solutions of different density are served in a well from the storage tanks 13 and Viasna the torch is made necessary research complex then in the landing nipple 6 installed downhole shutoff valve.

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 impact on wellhead and wellbore zone.


Claims

The way of development wells, including the descent of the lift pipes with packer, replacing the mud on the lightweight, spacerowa packer, call flow, characterized in that the lifting column with the packer down to the roof of the reservoir, replace the mud in the interval descent tubing string with a packer on a lightweight fluid with maintaining back pressure on the formation spacerowa packer, down into the well to the bottom through the Elevator column and zapakowany packer flexible pipe Koltunova installation, replace the remaining downhole mud on a lightweight fluid with maintaining back pressure on the reservoir, produce effects on the near-wellbore area of the formation method of variable pressures of aqueous solutions of calcium chloride or inorganic surface of the cycles, Stripping downhole pack, cause the flow of formation fluids from the reservoir, remove the flexible pipe and work well on the torch, replacing the mud on the light liquid in the interval descent tubing string with a packer and downhole do the following: the mud density in the borehole, manual replace clay solutions with densities of 10-20% lower than the previous replaceable, they fill the buffer fluid - technical water with carboxymethylcellulose in an amount equal to the volume of the cavity lift pipes, and then an aqueous solution of calcium chloride with the obligatory washing of the wells at each stage for at least two cycles and maintaining back pressure on the reservoir, the amount of back pressure on the formation is chosen from the condition
PZab~ PPL= (Py+10-5WH)<PEC,
where RZab, RPL, Ryaccordingly downhole, the reservoir and the wellhead pressure, MPa;
W- the density of the borehole fluid, kg/m3;
H - the depth of the bottom hole punching, m;
PopEC- the pressure is vazhiny on the torch to choose from conditions
PPL> RZab0,7 PPL.

 

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