Flowing well killing method

FIELD: oil and gas industry, particularly flowing well killing for underground repair and overhaul performing.

SUBSTANCE: method involves blocking perforation interval and part of well bottom zone by replacing well fluid with blocking fluid and killing liquid arranged over the blocking one. Free gas is removed from well before blocking fluid delivery to well bottom. Necessary liquid level at well head is provided by well operation stoppage for a certain time, which provides termination of formation fluid degassing in well bore and free gas lifting to well head. Tube space and hole annuity is filled with liquid in several steps along with discharge of gas portions. Gas portion discharge may not result in formation fluid rise inside well bore to level of formation fluid degassing. Density of liquid to be added in tube space and hole annuity provides well filling to head thereof. Well killing liquid comprises industrial magnesium chloride, alkali or alkaline-earth metal hydrate, alkali metal carbonate and pore sealant, for instance cacao-bean pods and fresh water taken in predetermined ratio.

EFFECT: increased efficiency, possibility to kill wells characterized by abnormally high permeability of production bed and high gas factor.

2 cl, 1 ex

 

The invention relates to the oil and gas industry, in particular the killing underground and capital repairs of wells having significant gas factor, abnormally high permeability of the productive formation (zone absorption).

There is a method of plugging the hole injection blocking fluid - micellar solution and an aqueous solution of inorganic salts (1).

The disadvantages of this method are the use of micellar solution, unstable upon contact with saline water, the need to involve special equipment and precision in respect of the formulation, and the prices used in the composition of the surfactant. In addition, there is a partial contamination of bottom-hole formation zone. This set of flaws makes the application of the method is technologically and economically inefficient.

There is also known a method of plugging wells, which includes the replacement of downhole fluid sequential injection inverse emulsion and advocay fluid density not higher than the density of the inverse emulsion (2).

The disadvantage of this method is the limited scope of the reverse emulsion, due to possible damage under conditions nizkoorbitalnyih wells in contact with oil, kalimatul the th productive interval of the formation.

Known fluid for plugging wells comprising monosulfite black liquor 80-90 wt.% chlorides and one - and divalent metals 6-20 wt.% (3).

This fluid has a number of inherent disadvantages. It is not effective enough due to insufficient density and cannot be applied in layers, characterized by abnormally high permeability zones absorption. In addition, the contents monosulfite liquor within these limits increases the viscosity of the composition that inhibits the use of the fluid, particularly at low temperatures.

There is also known a method of plugging wells, including blocking the perforated interval nefiltruotas high viscosity invert dispersion and subsequent filling of the well an aqueous solution of inorganic salts of lower density (4).

The disadvantage of this method is the need for development of wells with the use of mineral acids and organic solvents for the destruction of the remnants of the dispersions, which complicates the operation of the start and completion times.

The closest in technical essence and the achieved effect to the claimed method is killing the well, including blocking the perforated interval and part of the bottom-hole formation zone by replacing downhole fluid blocking and above her ass is full of liquid with a pushing portion blocking a definite volume of liquid in the bottomhole formation zone (5).

However, when implementing a known way possible residual contamination of bottom-hole formation zone of the wood flour particles falling within the pore space and to seal the pores wellbore zone due to incomplete removal of the latter during the development of the well known ways, as well as complication at high gas factor at flowing wells.

The basis of the invention is to create a highly effective method of killing flowing well characterized by abnormally high permeability of the productive formation and a significant gas factor, and blocking solution for its implementation.

The problem is solved in that in the process of killing the well, including blocking the perforated interval and part of the bottom-hole formation zone by replacing downhole fluid blocking and above it advocay liquid with a pushing portion blocking a definite volume of liquid in the bottomhole formation zone, prior to delivery of the blocking of the liquid at the bottom of the well to remove the gas which is in a free state, and reaches the setting level of the liquid on the mouth, by stopping the well at the time for halting the degassing of formation fluids in the wellbore and the lifting of the free gas to the wellhead, and further phased by the traditional topping in the pipe and annulus space fluid with subsequent discharge portion of gas, when the reset portion of gas should not lead to the lifting of the formation fluid in the wellbore above the level at which it starts, degassing, and the density of the filling liquid must ensure filling of the well to its mouth, and blocking fluid for plugging wells includes magnesium chloride technical (bischofite), hydroxide of alkaline or alkaline-earth metal, a carbonate of an alkali metal, a sealer then hermoor" (for example, the husks of cocoa beans), fresh water in the following ratio of components, g/l:

- magnesium chloride technical (bischofite) GOST 7759-73 - 180-220;

the hydroxide of alkali or alkaline earth metal based on sodium hydroxide (caustic soda THAT 6-01-1306-85) - 130-150;

- carbonate of an alkali metal in the calculation of the sodium carbonate (soda ash GOST 4201-79) - 30-40;

- hermoor (the husk of the cocoa bean) - 80-100;

- fresh water GOST 2874-82 - rest.

The claimed combination of qualitative and quantitative essential features allows to achieve a sufficient blocking effect in the perforation interval without contamination of bottom-hole formation zone, and prevent complications from high gas factor, which manifest in the form of emission of the downhole fluid at the surface of gas bubbles to the wellhead.

The composition provides a blocking interval p is glashauser layer. Blocking occurs because of the ability germophobe (in particular, the husks of cocoa beans) clogging pores wellbore zone directly on the surface of the borehole wall, not being filtered into the reservoir and not clogging the pore space. The proposed blocking fluid stable over time, sedimentation stable, has a sufficiently low pour point (up to -30° (C)practically does not penetrate into the formation, technological, simple to prepare and use.

Blocking fluid can be prepared directly on site or in the factory without adding germophobe with further transportation to the destination, and hermoor add before use.

Brief description of the technological process of killing flowing wells.

Killing the well produce direct delivery blocking fluid downhole using the kill fluid, is placed above the blocking fluid.

Stopping work well for 1 day to stabilize the liquid level in the annulus and the tubing (with closed valves in the annulus and tubing). Detectable levels of fluid in the annulus and tube space. Gradually, by topping portions of the liquid filling in the annulus and a portion of the discharge gas from it into the production line to achieve received the I level of the liquid in the mouth. This is done to prevent the emergence of new portions of the gas in the free state, which may be formed in the degassing reservoir fluid, pull into the annulus when full, one-time reset of the pressure in the gas cap. Similarly, the work produced with the column tubing. This manipulation can be done Vice versa, first in the tubing, then Strub. Next, produced by the injection of fluid filling in the tube space in the volume equal to the volume of the tubing. When closed tubing produced by the injection into the annulus of the kill fluid in the volume of the annular space plus the volume of the wells from artificial face to the tubing hangers. When the open annulus produced by the injection tubing prepared blocking solution and put it estimated the number of kill fluid into the zone of the wellbore, which revealed the productive horizon. At the same time observe the behavior of the liquid level in the annulus. If, after injection into the tubing estimated number of kill fluid circulation in the annulus is absent, the process of killing the well is stopped and the well is observed within 2 hours in the presence of moving the liquid levels in the pipe and annulus. In the absence of circulation is fixed jamming SK is ageny. Otherwise produced by the injection of fluid damping to stop the circulation.

The amount of blocking of the fluid is determined by the formula:

where: Vblock- the amount of blocking fluid, m3;

dSLE- diameter wells in the area of the exposed thickness of the layer, m;

Hslave- opened the thickness of the reservoir, m;

η enrolment rate (determined on the basis of specific geological conditions of the well);

VCAW- volume of cavities defined according to cavernosometry m3.

An example of a specific implementation process of killing the production well.

The proposed method of killing was performed on well # 105 Memorable-Sasovo field. The diameter of the production string of 168 mm, artificial slaughter - 2710 m, outdoor swimming trunk - 2710-2556 m, depth 2.5 inch tubing - 2554 m, operated by horizon - E2, reservoir pressure of 6.2 MPa at KSS, buffer pressure of 6.2 MPa, the pressure in the annulus - 3.3 MPa. The flow rate of the liquid - 227 m3the oil output is 180 tons, gas factor - 117 m3/so

According to the proposed method to stabilize the level of the hole was stopped at 4 hours, took measurements of the pressure in the buffer and in the annulus, on the basis of the received data and calculations prepared blocking solution of 2.7 m3the ay mixing gel from bischofite brine and soda solution and pre-soaked in fresh water germophobe, made the necessary tying wellhead equipment with tank and pump units, produced 5 cycles of injection of the liquid filling in the annulus and relief from it with gas in order to obtain the liquid level at the wellhead. Each cycle corresponded to 300 liters pumped into the annulus fluid fill. When the annulus pressure 0.2 MPa during the first cycle, while the rest remained constant, from which it followed that the fluid level is at the mouth. Then made a measurement of the level device SU DOS in the tube space, which amounted to 393 m, produced five cycles of injection of the liquid filling in the tube space and the discharge of gas from it. In the first cycle, the gas pressure was lowered to 0.5 MPa for injection of 300 l and over the next four cycle 400 l with a decrease in pressure after the discharge of gas respectively at 1.4 MPa, 0.4 MPa, 0.2 MPa, and on the fifth cycle, the pressure remained constant, and the mouth appeared fluid. Later in the pipes produced injection 8 m3liquid filling density (1060 kg/m3), then into the annulus 39 m3the kill fluid density (920 kg/m3and finished with an injection of 3 m3oil. Then, when the open annulus in pipes has been injected estimated number of blocking fluid volume ,7 m 3and then when you open annulus began pumping into the tube space of the kill fluid. The process of pumping kill fluid in the tubing was monitored using a pressure gauge on the unit and level in the annulus. After receipt of a blocking fluid into the open area of the wellbore level in the annulus has changed from 140 m to 125 m, and then again began to fall, and at this point, the injection was stopped. Within 2 hours the unit SU DOS watched the liquid level in the annulus and pipe spaces, which remained 140 m respectively in annular and 210 m in the pipe. On the basis of which the conclusion was made about the end of the process killing. The process of changing the valve was without complications. The liquid level was controlled by the device SOUS DOS, which remained unchanged during the 5 hours of repair of the well. Then the well was developed by replacing the kill fluid in the fluid of lower density. After mastering the hole left for 1 hour at the same level mode of operation.

The invention has the following advantages:

- blocking fluid has a large effect to neutralize zones absorption productive formations;

- blocking the fluid to a greater extent ensures the preservation of the hydrodynamic properties of the reservoir after the salt is placed in the borehole;

- the proposed technology is killing eliminates complications in wells with high Gor.

Sources of information

1. SU authorship, 874975, CL E 21 In 33/10, 1981

2. SU authorship 1633090, CL E 21 In 33/10, 1991

3. RU, patent, 2044753, CL 09 To 7/00, 1995

4. RU, patent, 2005762, CL 09 To 7/02, 1994

5. RU, patent, 2104392, CL E 21 In 33/10, 1996

1. The process of killing flowing wells, including blocking interval penetrated thickness of the productive formation and part of the bottom-hole formation zone by replacing the downhole fluid at blocking the estimated volume above it advocay the kill fluid, characterized in that prior to delivery of the blocking of the liquid at the bottom of the well to remove the gas which is in a free state, and reaches the setting level of the liquid in the mouth by stopping the well at the time for halting the degassing of formation fluids in the wellbore and the lifting of the free gas to the wellhead, and further phased portions topping in the pipe and annulus fluid with subsequent discharge portion of gas, when the reset portion of gas should not lead to the lifting of the formation fluid in the wellbore above the level at which it starts, degassing, and the density of the filling liquid must ensure that the cover is of the well to its mouth.

2. Blocking fluid for plugging wells comprising magnesium chloride technical - bischofite, hydroxide of alkali or alkaline earth metal, a carbonate of an alkali metal, a sealer then hermoor", such as the husks of cocoa beans, the fresh water in the following ratio of components, g/l:

Magnesium chloride technical - bischofite180-220
The hydroxide of alkali or alkaline earth metal in the calculation of the sodium hydroxide - caustic soda130-150
The carbonate of the alkali metal based on the sodium carbonate - soda ash30-40
Hermoor, such as the husk of the cocoa bean80-100
Fresh waterRest



 

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