Drilling wastes underground burial

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used in permafrost regions with hydraulically isolated lenses of underground smelt water bearing sand collectors, cryopag (CP), for burial of drilling wastes (DW). Proposed method comprises drilling of one injection well in CP and at least one CP relieving well. Besides, it includes pressure pre-decrease in CP by forcing water-sand pulp via said CP relieving well. Decreased pressure stabilised in injection well, uniform mix of drilling wastes and at least 10 wt. % of crushed ice made from sea water or water pumped from CP with additional of the mix of fluid hydro geological indicator (HGI). Note here that drill wastes are continuously subjected to audio frequency vibrator effects nearby suspended tubing shoe. Injection is continued unless HGI traces appear in pulp forced from relieving well. Then, drilling waste injection into CP, their vibration and pumping of pulp from CP are terminated to eliminate RW. For burial of extra volume of drilling wastes, another RW is constructure to go on injecting of drilling wastes via the same IW with their vibration and application of another RW.

EFFECT: ecologically safe and efficient process.

2 cl, 1 dwg

 

The invention relates primarily to the oil and gas industry and can be used in the drilling of exploration, production, injection, observation, absorbing, Zapadnaya and other drilling wells in areas adjacent to the coasts of the Arctic ocean and is covered with layer of permafrost great power.

When drilling any exploratory or production well there is a large volume of drilling waste (BO): drill cuttings in the form of sand and gravel unrounded particles of drilled rocks; used drilling muds (OBR) in the form wodageneh suspensions containing many different usually harmful additives, the regulatory properties of the drilling fluid; drilling sewage - contaminated clay particles and the above-mentioned additives water derived from leaching of drilling tools and equipment and component usually around 70% of the volume of drilling waste. Total BO from one well is usually not less than 300 m3and the total amount of drilling 20 wells one well pad may range from 6000 m3up to 8000 m3.

The annual volume of BO in the regeneration of one of the largest gas fields on the Yamal Peninsula is approximately 25 thousand m3. Average share BO 1250 kg/sup> 3the freezing temperature of -2C.

There is a method of disposal of BO in the underground caverns, developed by thawing permafrost sandy sediments or ice in the depth interval from 15 to 100 m from the earth's surface in accordance with the patent RU No. 2438953. The disadvantages of this method are the cost of time, labor and material resources on the preliminary construction of underground tanks, no in the right places geocryological conditions necessary for the construction of underground tanks, the risk of extrusion buried BO on the surface due to subsidence and failures covering strata restapling in the construction of rocks, as well as significant areas of contamination of the earth's surface maps of reclamation (gidrootvalov) is retrieved to the surface vodoprochnoi pulp (AIV).

Closest to the proposed invention is the injection of liquid industrial waste in deep porous reservoir rocks through disposal wells (see Mining science. Development and maintenance of the bowels of the earth. Under the editorship of academician KONSTANTIN. Trubetskoy. M.: Izd. Academy of mining Sciences, 1997, 478 S.; s). The disadvantages of this method are the high cost of drilling and operation of absorbing wells (usually depth of not less than 700-1000 m), a serious environmental hazard of contamination of groundwater in the, including aquifers of drinking water due to uncontrolled proliferation injected into underground reservoirs of waste and the need for periodic recovery declining pickup absorbing wells or even the construction of additional wells to replace the broken ones.

The aim of the invention is to overcome the above shortcomings in oil and gas fields of the Far North, such as the Yamal Peninsula, based on the specifics of geocryological structure thickness of permafrost rocks (MSE) of the Yamal Peninsula and adjacent to the coasts of the Arctic ocean regions with similar geocryological conditions, including shallow shelf.

Mentioned specificity consists in the fact that the thickness of MMP total capacity is usually not less than 300 m, is a two - or even three-layered and comprises almost everywhere local hydraulically isolated lenses melt aquifer porous sand reservoirs - kriopegov, the pores of which are filled with saline water under pressure from 30 to 130 m of the water column (i.e. under pressure from 3 to 13 kg/cm2). The composition of salts of kriopegov similar to the composition of sea water salts, and the salt content of the same or higher than the salinity of the sea water from which they were formed, re is the query result, and this saline water does not freeze at temperatures from -1C to -4C. When pumping water from Kriopigi through hole obtained at rates of up to 20 m3per day when the coefficient of permeability K=2.5 m/day at a pressure drop of 1 kg/cm2. However, such lenses brines are located at different depths from the first meters to 200 m from the surface, and the static groundwater levels in the lenses of different, usually they are in the wells of 5-10 m below the surface and well above sea level, which is convincing evidence about the lack of hydraulic connection of such lenses as the sea, and with each other, that is, their isolation in natural conditions over long periods of time (thousands of years).

Saline water kriopegov not represent value for technical or drinking water and can be used only for the preparation of fresh drilling mud, which when mixed with the catalyst in fresh water usually add chloride salt, close in composition of the salts of sea water.

This goal is achieved by the fact that, until the sole of the lens Kriopigi are drilling at least one injection (absorbing) and at least one relief well (water) wells located within a radius of mutual hydraulic effects in porous collector Kriopigi, for example, at a distance of from 50 to 100 m from each other. Well attached to the roof of Kriopigi cemented casing to onami, equip the absorption well injection outboard column with an open lower end above the bottom of Kriopigi and unloading the well - hydrogeological filter in the interval creepage and, if necessary, suspended in a column with an open bottom end and skipped inside the pipe (duct) for injection through it from the surface of compressed air and airlifting rise on a suspended column (annular space between it and the duct) of water or utopische pulp on the surface of the earth.

Near the mouth of the injection wells are installing a concrete pump and a hopper for unloading it transported from the drill holes in automixer-concrete trucks destined for landfill disposal, BO, icemaker, as well as dosing pump for injection into the flow BO liquid hydrogeological indicator and remote control downhole vibrator of the type used in construction for sealing concrete, which is omitted from the surface below the discharge end of the suspended column.

In advance of the relief well is pumped out to the surface of the saline water or podopechnuju slurry with a flow rate of, for example, 10 m3/h above the designed average flow injection absorption well BO, for example 3 m3/h, until then, until falling in the result that the first pumping level of the saline water in the annular space of the casing and suspended columns injection wells, reflecting on the establishment practically stationary hydraulic pumping mode pulp from Kriopigi.

Drained saline water after sludge is partially used for cooking it in the ice machine, granular ice to mix it with a lot of buried BO, and the rest of the water is transported to the drilling site for the preparation of fresh drilling mud.

Then upload the concrete pump on a suspended column injection wells are substantially uniformly mixed in automixer complex mixture of all types of BO, including drill cuttings and liquid BO with preferably finely chopped salted ice above the base of Kriopigi continuous low-amplitude vibration of the injected mass vibrator vibrations of audio frequency, such as 50 Hz, and in the flow of the injected waste pump dosing pump liquid hydrogeological indicator recognized after repeated dilution. During waste injection are constantly monitoring the level of saline water in the annular microbe injection wells. When exceeding the static source pressure temporarily suspend the injection of BO or reduce the flow rate of the injection up until the water level in the well has dropped to a level that was started pumping BO.

Download BO in cripa the continue (periodically or continuously), while in the water, pumped from a relief well to the surface will not be detected persistent signs of the indicator fluid, suggesting that the most moving part disposed BO overcame the distance between the wells and begin to act upon the discharge hole on the surface of the earth. After that, the injection of BO in the injection well and pumping water from a relief well to stop the burial of BO in the area between the wells is considered complete, a relief well will be shut down, if necessary, to continue dumping new BO instead of it, Buryats new relief well located, for example, symmetrically with respect to the discharge, and take further disposal BO between injection and a new discharge hole, continuing the process if necessary several times (for example, up to 8).

Explain the need for the proposed sequence of operations. The most important condition for the environmentally sound implementation of the proposed method is guaranteed to prevent fracturing covering cryopeg thickness of MMP. In the case of conventional injection liquid BO in cryopeg through a tight hole without the prior hydraulic unloading creepage fluid pressure therein, as in hydraulically closed system will be inevitable is about to rise and after some excess natural pressure (for example, at approximately 3 kg/cm2higher than the normal long-term strength of frozen rocks to break) will inevitably occur fracturing covering thickness in the form of an approximately vertical cracks or system such cracks with all negative consequences for the environment.

Anticipatory areal hydraulic unloading creepage from natural (and even more from exceeding its pressure, achieved by continuous pumping of water or utopische pulp from relief wells can be reliably and continuously in the process of disposal BO to monitor the actual pressure and prevent sustainable excess natural pressure creepage within the radius of influence of pumping from the relief well borehole and maintain depression in the direction from the discharge to the discharge hole, providing a preferential distribution of buried BO in Kriopigi in the direction from the injection to the relief well borehole. Continuous monitoring of the water level in microbe casing and suspended columns injection wells allows you to constantly monitor the actual pressure in Kriopigi and, if necessary, to prevent its increase, for example, by temporarily stopping or reducing the flow injection BO.

Injected under pressure over the sole of Kriopigi fluid BO PE the IU injection are usually positive temperature which can cause defrosting of the MSE for the casing. Additive to waste at least 10% by weight of crushed slightly saline ice, activeuser at a temperature of about -1C, allows you to quickly cool the injected fluid BO to a temperature below 0C and to prevent the thawing and depressurization annular space injection wells. Thus formed approximately uniformly over the volume of waste meltwater additionally dilutes the volume pumped into cryopeg BO, reduces the viscosity of the flow when moving BO hanging down the column and hydraulic friction losses, contributes to their better flow in the collector creepage on all sides from the Shoe suspended discharge column. This decreases the angle of friction and angle of repose of the waste mass on the border with rocks of the collector, which contributes to a better substitution and displacement of reservoir rocks under the action of pressure difference between the injection and the relief well borehole. This process stimulates continuous vibration of the mass of injected waste, decreasing their effective viscosity and facilitate the spreading of waste by volume Kriopigi, including through partial substitution of saline water in the pores of the clay suspension ARR.

Technological diagram illustrating the proposed method, shown in figure 1, where:

<> 1. Permafrost sedimentary rocks (MMP).

2. Sole thickness MMP.

3. Typical natural temperature MMP.

4. Isolated MMP artesian aquifer (cryopeg").

5. Injection wells for injection of drilling waste.

6. Suspended discharge column for injection of drilling waste (BO).

7. The relief well bore for pumping vodoprochnoi pulp from Kriopigi 4.

8. The casing of wells.

9. Cement shell casing 8.

10. Pulp-raising hanging column.

11. Air suspension column.

12. Protivopotochny hydrogeological filter in the depth interval of Kriopigi 4 in the relief well borehole 7.

13. Tank with indicator fluid.

14. Dosing pump for feeding into the flow BO indicator fluid.

15. Control vibrator 24.

16. A pump for pumping BO in column 6.

17. A mixer for mixing BO with ice pellets.

18. The ice maker.

19. A hopper BO.

20. Automonous with BO.

21. A compressor for supplying compressed air to the column 11.

22. A hopper for receiving and settling of the pulp.

23. Sandy dump sludge pulp.

24. The vibrator.

25. Clay paste on the layer of sludge.

26. Cuttings above the sole of Kriopigi 4.

27. Direction filter disposed of drilling waste.

28. Source the th static level pressure groundwater creepage 4.

29. Steady-state groundwater levels of Kriopigi in the pumping utopische pulp from the relief well borehole 7.

The proposed method is as follows.

In isolated permafrost rocks 1 cryopeg 4 drilled injection well 5 download BO and unloading bore 7 for pumping vodoprochnoi pulp. Cryopeg 4 is characterized by the initial static pressure level of groundwater 28. Wells 5 and 7 grow columns 8 and fix the cement casing 9.

In the casing of the well 7 is lowered pulp-raising hanging column 10, air suspension column 11 to create a ring microbe outboard columns 10 and 11 mode airlift. The top of the well seal 7, connect the column 11 by pipeline with compressor 21 for supplying compressed air, and the column 10 with a hopper 22 for receiving and settling utopische pulp. The discharge hole 7 in the interval creepage equip hydrogeological protivopolojnym filter 12.

Through the tube 10 before entering buried BO from Kriopigi 4 produce better areal hydraulic unloading by pumping saline water or utopische pulp from Kriopigi on the surface, while continuously monitor the water level in microbe casing and suspended columns supercharger is Oh well the actual water pressure in Kriopigi) and when reaching the steady-state pressure in Kriopigi 29, smaller stationary level 28, begin to flow BO to cryopeg 4 through the discharge hole 5. In the injection process, BO control steady-state pressure in Kriopigi 29 allows to regulate the flow rate of the injected BO and prevent it from increasing by reducing the flow rate of the injected BO or temporary cessation of injection.

Pumped out to the surface vodopada pulp is fed into the hopper 22, where the solid sludge enters the blade 23 for disposal or further use for dumping of drilling sites and saline water partially flows into the ice maker 18 for the preparation of granular ice and its mixing with a mass of buried BO, and the remaining water is removed by drilling sites for cooking fresh drilling mud

In the well 5 is lowered to download BO suspended working column 6, the open lower end of which is fitted over the bottom of Kriopigi, and the vibrator 24, controlled from the control station 15 and lowered approximately below the open lower end of the injection outboard of the column 6. The top of the well seal 5, column 6 connect the pipeline with a pump 16, which from the mixer 17 gives cryopeg 4 a mixture of BO coming from the hopper 19 and transported to him from drilling rigs by automonously 20, and ice pellets from ledolter the ora 18, designed for rapid cooling of the injected BO to a temperature below 0C and prevent thawing and depressurization annular space injection wells 5. Thus formed in the volume of waste meltwater additionally thins uploaded in cryopeg BO, reduces the viscosity of the flow when moving BO hanging down the column 6 and the hydraulic friction losses, contributes to a better spreading of the BO in the collector creepage on all sides from the Shoe suspension pressure column 6. This process also stimulates continuous vibration of the mass of injected waste vibrator sound frequency 24, also decreasing their effective viscosity and facilitate the spreading of waste by volume Kriopigi, including through partial substitution of saline water in the pores of the clay suspension is ABOUT, as well as prevent freezing of ice crystals in the monolith. In a particular implementation of the method as a mixer 17 can be used automonous 20, in which you can serve ice pellets of ice generator 18, and then upload the resulting mixture into a hopper 19 and out through pump 16 to apply for the disposal of the resulting mixture BO with ice pellets in cryopeg 4 directly. Column 6 is also connected by pipeline to a dosing pump 14 for supplying the flow BO indicator liquid from R is servoir 13.

Download BO in cryopeg 4 continue (periodically or continuously)in the water discharged from the discharge hole 7 on the surface will not be detected persistent signs of the indicator fluid, suggesting that the most moving part disposed BO overcame the distance between the wells and started to flow to the surface. After that, the injection of BO in the injection well 5 and the pumping of water from the discharge hole 7 stop and disposal of BO in the area between the wells is considered complete.

An example of the method.

On one of the gas fields of Yamal opened cryopeg in the thickness of the MMP in the depth interval from to 62.5 66.5 m under the natural pressure of the groundwater 54 m (5.5 kg/cm2).

For the disposal of 3000 m3drilling waste was drilled at a distance of 75 m from each other injection and unloading of the well depth of 70 m each. Both wells are cemented cemented casing strings with a diameter of 245 mm to a depth of 60 m, the injection well was lowered to a depth of 66 m suspended working column with a diameter of 127 mm, and in the relief well borehole lowered suspension column with a diameter of 168 mm to a depth of 66 m, is provided in the depth interval 60-66 m hydrogeological net protivopolojnym filter. Inside the relief well borehole lowered to a depth of 59 m pipe di the meter 60 mm for compressed air supply.

In unloading the well began to pump compressed air compressor HB-10 performance 10 m3/min, resulting from the column began airlifting pumping water from Kriopigi with the flow rate (flow rate) of 12 m3/hour, a Pressure of salt water into the injection well through the day began to drop and after 7 days dropped to 52 m (the water level in the well with 7.5 m from the surface decreased to 9.5 m).

Part of the pumped out from Kriopigi saline water in the ice maker produced approximately 12 m of ice in the form of granules ranging in size from 5 to 15 mm, the rest of the water were taken in avtonomniy as process water for the production of drilling mud.

Then began pumping the concrete evenly mixed in automixer-concrete drilling waste with 20% by volume of granular ice with average consumption of 3.5 m3/h when the injection pressure of 12 kg/cm2. The waste stream was pumped liquid fluorescein in the amount of 10 ml per 1 m3drilling waste, and the bottom space of the well is continuously vibrated by the vibrator power of 0.8 kW.

After 28 days of injection with average daily consumption 56 m3/day actual drilling waste (total of 1570 m3in disposable water wells were signs of fluorescein. Pumping water from this relief well borehole was terminated, instead of zablagovremenno prepared symmetrically located another disposable wells began a similar pumping out saline water from Kriopigi, and for the next 31 days were injected into the absorption well still 1730 m3drilling waste.

After this disposal project in the amount of drilling waste was finished, both absorptive and unloading the well after the dismantling of them hanging columns and equipment eliminated by installing them in cement plugs, the tip of the wells were cut, and the surface of the earth (tundra cover) over the platforms wells rekultivirovana, leaving over wells informing the frames with the necessary information about the wells.

1. Way underground disposal of drilling waste in the thickness of permafrost rocks in hydraulically isolated lenses melt aquifer porous sand reservoirs - kriopegov, including transportation of waste drill cuttings from the drilling rig and injected through an injection well into cryopeg, wherein the pre-lower natural static pressure in the injection well and its surroundings by pumping saline water or utopische pulp from Kriopigi through at least one adjacent hydraulically disposable cryopeg the borehole to the surface, after stabilization of reduced pressure in the injection well in the pumping of water from the relief well borehole pumped through the suspended working convoy magnetotail the Noah wells a substantially uniform mixture of all types of drilling waste and not less than ten weight percent crushed or granulated ice, prepared preferably from saline sea water or water that is pumped out through the relief well borehole from Kriopigi, adding to the mixture of liquid hydrogeological indicator, continuous low-amplitude vibration of the injected drilling waste vibrator sound frequencies below the Shoe referred to the suspension of the column, the injection continues until the detection in water pumped from the relief well borehole hydrogeological characteristics of the indicator, after which the injection of drilling waste in the absorption well, their vibration and pumping water or utopische pulp from the relief well borehole cease to relieve the well will be shut down, and if necessary, disposal of the additional volume of drilling waste equip another relief well borehole and continue pumping drilling waste through the same absorption well with their vibration and similar use another disposable wells.

2. The method according to claim 1, characterized in that as the liquid hydrogeological indicator using fluorescein.



 

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22 cl, 2 dwg

FIELD: transport.

SUBSTANCE: invention relates to making underground reservoirs in rock salt formations. Reservoir is profiled using concentrically arranged tubes to lift brine, feed water and production pipes. Thereafter, water feed pipe is withdrawn to feed water feed column composed of flexible water feed pipe. Then, reservoir shape is corrected by feeding solvent at reservoir correction point via gap between brine lift tube and flexible water feed pipe of said column. Additionally, device comprises water feed column with flexible water feed pipe ropes arranged in symmetry about is cross-section and passed through rings rigidly secured to flexible pipe at regular spacing to connect flexible pipe bottom end with auxiliary winches.

EFFECT: expanded operating performances.

2 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to underground storage and reservation system of LNG for its accumulation and distribution to the consumer. LNG US is located below the ground level 1 at the elevation preventing the freezing of ground surface at the most long-term estimated storage of LNG. It is blocked off and protected along the perimeter from ground mass with a concrete wall of "wall in ground" type 2. It includes reinforced-concrete tank 5 located at the bottom from compacted ground 3 and heat-insulating intermediate layer 4, which is enveloped on external side surface with soft intermediate layer 6, and on the inner side it is covered with layers of heat insulation 7 and waterproof insulation 8 from LNG. LNG US is equipped with process shaft 9 with pipelines 10, which comes out of reinforced-concrete reservoir to ground surface 1, tight hatches 11 and stairs 12. Top of concrete reservoir is filled with a layer of light heat-insulating material 13. Vertical wall of reinforced-concrete reservoir 5 is made of single-type elements of constant curvature in the form of solid reinforced-concrete units 14 of constant section with surfaces 15 adjacent to each other. Along the perimetre of end surfaces 15 of reinforced-concrete blocks 14 and their centre there made are grooves of rectangular section with tightening horizontal and vertical 18 reinforcement installed in them (vertical 17 and horizontal 18 tightening reinforcement rods).

EFFECT: use of the invention ensures reliability of horizontal tightening of reinforced-concrete blocks; simplifying the construction procedure of side walls of reservoir; improving construction quality and operating reliability of LNG US.

5 dwg

FIELD: oil and gas production.

SUBSTANCE: proposed device comprises water feed tube with bottom head Note here that the latter features length exceeding radius of reservoir and is made of flexible water feed tube furnished with mechanical muscles secured thereto and pneumatically or hydraulically communicated with pressure source to control every muscle for positioning tube end in space.

EFFECT: higher efficiency.

3 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes performing a test pumping of liquid waste into absorbing well before operational pumping, while changing flow step-by-step. From equation of absorption base hydrodynamic parameters are determined for calculation of predicted coefficients of operation characteristics of absorbing well and reserve well. During operational pumping of liquid waste together with thermometry along absorbing well shaft, registration of actual pressures and flow on pump devices, actual pressures on mouth in tubing pipes of absorbing well, actual pressures on face are additionally registered in absorbing well as well as pressures on mouth in behind-pipe space, actual loss at mouth in behind-pipe space, actual loss of waste on mouth, actual positions of face well, upper and lower limits of absorption range from well mouth. In reserve well actual pressures on face are registered, as well as actual positions of liquid level from reserve well mouth, upper and lower limits of absorption range. Prediction coefficients are compared for operation characteristics of absorbing well and reserve well to actual coefficients. 9 conditions of hydrodynamic bed conditions at reserve well and absorbing well are considered during pumping of waste. Specific actions of operator on each condition are described.

EFFECT: higher reliability and trustworthiness.

1 ex

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