Method of oil well development (versions)

FIELD: oil and gas industry.

SUBSTANCE: according to method of development of oil well containing oil-bearing stratum and underlying water-bearing stratum divided by bulkhead having thickness of 0.8-2m the well is surveyed in order to identify position of oil-bearing and water-bearing stratum strata. State of the flow string is defined. Behind-the-casing-flows are identified. Inflow and injection profiles are defined. Then water-bearing stratum is perforated. A packer is run down to the upper boundary of water-bearing stratum and set. Then water shutoff compound is injected and flushed to water-bearing stratum in volume precalculated as per analytic expression. Water shutoff screen is formed. Then the packer is pulled out. Cement grout is pumped to the flow string up to the level higher than roof of oil-bearing stratum until it forms a cement plug insulating the stratum. Upon waiting period for cement hardening the cement plug is drilled out up to the depth higher than roof of water-bearing stratum. At that minimum waiting period for cement hardening is equal to 24-72 hours. Tightness of the bottom hole is surveyed. The oil-bearing stratum is penetrated within the required interval and oil is recovered.

EFFECT: reduced probability of behind-the-casing flows in underlying water-bearing strata, increasing oil flow rate and reducing water encroachment in oil.

2 cl, 1 tbl, 1 dwg

 

The invention relates to oil industry and may find application in the development of oil wells.

Currently when opening productive deposits pashian horizon terrigenous Devonian geological section can be represented in several productive oilfields and aquifers separated by clay bridges of small thickness (0.8 to 2 m). Small thickness of shale barriers between oil-saturated and aquifers are the main cause of cross-flows. Elimination of cross-flows is low successful event due to technological difficulties.

A method of developing multilayer oil deposits (patent RU 2431747 C1, IPC E21B 43/32; publ. 20.10.2011), including the opening of the casing, the descent of the tubing strings (GROWTH) packer, setting the packer between the layers, the injection of the hardening cement slurry and the expectation of its solidification, characterized in that the pre-and pumped cement slurry is forced into the bottom obwodnica layer, after curing the layer of cement slurry made an autopsy of the casing above the bottom layer, set the packer above the perforated interval of the casing, and at the lower end of the column tubing fitting set for Priya�a fluid pump of Obvodnogo layer.

The disadvantage of this method is the impossibility of its use in wells in which oil and aquifer divided by crossing a small thickness in the range of 0.8-2 m. according to well-known way to prevent cross-flows in the interval between the layers produce the opening of the casing of the well perforation and injection of cement slurry in the annulus, and the perforated interval is at a distance of two meters above the roof of the lower stratum. Then between the upper layer and the perforated interval at a distance of 1.5 m above the perforated interval set the packer.

The problem to be solved by the presented invention is the provision of a method of developing oil wells containing oil and aquifers, separated by bridges of small thickness.

The technical result is the reduced risk of cross-flows from the underlying aquifer, lowering the water content of products, increase production of oil and consequently oil recovery, to expand the Arsenal of technical means.

The problem is solved by a method for developing oil wells in which oil and aquifers, separated by bridges of small thickness (0.8 to 2 m) containing phase�, in which:

1. Carry out a borehole survey to determine the position of the oilfields and aquifers, determine the status of the production string.

2. Perforated aquifer and shall fix and punching in aquifer water composition.

3. Pumped into the production casing cement slurry to above the roof in an oil reservoir for the formation of a cement plug of insulating the layer.

4. After a waiting time of hardening of cement razvarivat cement the bridge to a depth above the roof of the aquifer.

5. Examine the tightness of the slaughter.

6. Open the reservoir in the desired interval.

7. Carry out oil production.

Fig. 1 is a sectional view of a well with oil (NP) and aquifer (EAP) layers separated by a bridge of small thickness (0.8 to 2 m).

One of the variants of implementation of the method contains the following steps.

Determine the required for work in the well number water proofing compositions and cement. The amount of waterproofing composition required to kill Obvodnogo layer depends on the thickness of the layer and its permeability.

In one embodiment, the implementation of pre-calculation of the necessary volume of the composition is carried out according to the formula:

VW≈3,1·m·h·R 2,

where VW- injected volume, m3;

m - porosity ratio, the share of units;

h is the effective thickness of the reservoir, m;

R is the radius of the spin-waterproofing of the screen, and M.

Pull on tubing technological packer to the planned depth of planting (to the upper limit of the interval of fluid (water) from the well). Planting depth the packer is determined by the prevention of injection waterproofing composition in the reservoir interval, from which there is a flow of oil.

Then the planting of technological packer at planned depth with the control of the landing site by geophysical methods.

Then pumped into the isolated interval through the tubing prepared in advance waterproofing composition. As a waterproofing composition can be applied composition based on DSGA Polymer (production company Chevron Phillips Lp). In this composition, the following components:

- water-soluble polymer DSGA Polymer;

- sodium thiosulfate crystal corresponding to requirements of GOST 244-76, to accelerate dissolution of the polymer DSGA;

- sodium dichromate technical that meets the requirements of GOST 2651-78, crosslinking solution as a gelling agent;

- potassium chloride, corresponding to requirements of GOST 4568-95 to regulate the pH of the water for dissolving the polymer DSGA;

the solvent for the preparation of waterproofing composition the water is fresh or used in the formation pressure maintenance system (technical, produced, natural) no of solids with a pH of not more than 4. In seasons with low ambient temperature requires the use of heated water having a temperature of 20°C.

The approximate composition shown in table 1.

Table 1
Mark polymerThe composition
the concentration of polymer, kg/m3the concentration of sodium dichromate, kg/m3the concentration of sodium thiosulphate, kg/m3the concentration of potassium chloride, kg/m3
DSGA Polymer41420

The formation of gel water shutoff composition with the composition given in table 1, approximately 2-6 hours, depending on the properties of water for dissolution of the polymer DSGA possible adjustments to the recommended ranges of concentrations of reagents. The concentration of sodium dichromate in water composition may be reduced for the purpose ol�measures to extend the time of formation of the gel up to 5-6 h, either can be increased to reduce the time of formation of the gel to 2-3 hours

Forced waterproofing composition in the reservoir is injected in the tubing process fluid in the volume equal to the volume of the tubing string.

Next, you need to break and to raise the technological packer.

Then carry out the injection of cement mortar (plugging solution) for the formation of a cement bridge insulating layer. For preparing cement mortar can be used Portland cement that meets the requirements of GOST 1581-96 "Portland cement. Technical conditions" or other brands of cement and approved for use in the oil industry.

Leave the hole at the time of formation of gel water proofing compositions and waiting hardening of cement (WOC). Depending on the composition applied waterproofing compositions and cement mortar minimum stop time of wells for gel formation water composition and curing of the cement may vary from 24 to 72 hours.

Examine the tightness of the face. For this purpose, the molding pressure, for example at 150 ATM, determine the tightness of the face. The pressure drop indicates the presence of messages between slaughter and previously isolated layer. After crimping the excess pressure�tion need to be reduced in swabbing the well to a depth of 700-800 m, then to determine the level in the borehole using geophysical instrument (thermometer, hygrometer) several times within a certain period of time. For example, such measurements may be carried out after 1 hour, 2 hours and 3 hours after swabbing. If the fluid level does not change, so the bottom is sealed and there is no message with the underlying stand-alone layer.

Then spend the drilling out cement plug to a depth above the roof of the aquifer.

Open the reservoir in the desired interval and run well.

It should be noted that in other embodiments, in waterproofing compositions as geleobrazuyuschie polymer may be used:

- polyacrylamide (PAA), corresponding to the requirements of TU 2458-001-82330939-2008 "specifications. Polyacrylamide DP9-8177".

- guar gum galactomannan (a polysaccharide of vegetable origin) trademark "Huamin" beyond 2458-019-57258729-2006.

- xanthan gum (xanthan exopolysaccharide - biopolymer microbial origin), a solution of xanthan biopolymer (RBC).

sodium-carboxymethylcellulose (CMC), meets the requirements of THE 2231-002-50277563-2000 "Sodium-carboxymethylcellulose technical. Technical conditions".

As inducers of gelation in waterproofing compositions also mo�ut be used:

- chromium acetate on THE 2499-008-55373366-2006 "chromium Acetate, the aqueous solution or THE 2499-001-50635131-00 "the tanning agent. The aqueous solution of chromium acetate. Technical conditions";

- zinc oxide according to GOST 10262-73 "Reagents. Of zinc oxide. Technical conditions". Mass fraction of zinc oxide (ZnO) not less than 99.2 percent;

- magnesium oxide on THE 6-09-3023-79 Magnesium oxide, precipitated from natural raw materials. The qualification of "pure" or GOST 844-79 "burnt Magnesia technical. Technical conditions". Mass fraction of magnesium oxide (MgO) not less than 89%.

In yet another embodiment of the amount of waterproofing compositions for carrying out the works in the well is calculated based on the following empirical relationships:

V-20+5H;

where V is the volume of water of the composition, m3;

N - effective perforated thickness of the insulated interval, m.

In most cases, the amount of waterproofing compositions for carrying out the works in one well is 20-40 m3.

Instead of cement mortar as plugging solution can be used in the composition based on urea-formaldehyde resins (UFR) brand CFG GOST 14231-88 "urea-formaldehyde Resin. Technical conditions" or brand Retail K-1 THAT 2221-637-55778270-2004. "Urea-formaldehyde resin brand Retail K-1".

1. Method of development of oil wells containing oil shale and underlying aquifers, RA�divided between a bridge thickness of 0.8-2 m, containing phases in which:
- carry out a borehole survey to determine the position of the oilfields and aquifers, determine the condition of the production casing, reveal behind-the-casing flows, determine the profiles of the inflow and injection profiles;
- perforated aquifer;
- carry out the descent of the packer to the upper boundary of the aquifer, and the landing of the packer;
- carry out the fix and punching in aquifer water composition in volume, pre-computed by the formula:
V3≈3,14·m·h·R2
where V3- injected volume, m3;
m - porosity ratio, the share of units;
h is the effective thickness of the reservoir, m;
R is the radius of the spin-waterproofing of the screen, m;
- carry out the rise of the packer;
is pumped into the production casing cement slurry to above the roof in an oil reservoir for the formation of a cement bridge insulating layer;
- after a waiting time of hardening of cement razvarivat cement the bridge to a depth above the roof of the aquifer, and the minimal waiting time of hardening of cement is 24-72 hours;
to examine the tightness of the mine;
- reveal the reservoir in the desired interval; and
- carry out oil production.

2. Method of development of oil wells containing oil�th and underlying aquifers, separated by a bridge thickness of 0.8-2 m, containing phases in which:
- carry out a borehole survey to determine the position of the oilfields and aquifers, determine the condition of the production casing, reveal behind-the-casing flows, determine the profiles of the inflow and injection profiles;
- perforated aquifer;
- carry out the descent of the packer to the upper boundary of the aquifer, and the landing of the packer;
- carry out the fix and punching in aquifer water composition in volume, pre-computed by the formula:
V=20+5H,
where V is the volume of water of the composition, m3;
N - effective perforated thickness of the insulated interval, m;
- carry out the rise of the packer;
is pumped into the production casing cement slurry to above the roof in an oil reservoir for the formation of a cement bridge insulating layer;
- after a waiting time of hardening of cement razvarivat cement the bridge to a depth above the roof of the aquifer, and the minimal waiting time of hardening of cement is 24-72 hours;
to examine the tightness of the mine;
- reveal the reservoir in the desired interval; and
- carry out oil production.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: water and gas influx limiting method with well productivity recovery includes running in of a perforator at the flow string, perforation of the production casing, isolation of water and gas influx and elimination of leak-tightness failures in the production casing by injection of isolating compound through new openings thus forming a water-shutoff screen. At that perforation of the production casing and injection of the isolating compound are carried out during one trip of the perforator. A hydromechanical perforator designed to make openings in the production casing and further injection of the isolating compound is used as a perforator. At that perforation of the production casing is made within the interval of water and gas inflows.

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3 cl

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EFFECT: saving of time and resources for the method implementation at the expense of execution of several actions in one tripping.

FIELD: oil and gas industry.

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6 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas industry, and namely to shutoff of stratal water influx in gas and gas condensate wells by means of coil tubing technique. The concept of the invention is as follows: the method lies in running in of a flexible pipe into inner cavity of gas-well production tubing up to the bottomhole and cleanout of the bottomhole from liquid and mechanical impurities, filling of the well with gas condensate, subsequent lifting of the flexible pipe up to tubing shoe, injection to the perforated interval through annular space between the flexible pipe and production tubing of the first package of hydrophobisated compound containing ethyl silicate ETC-40 with 10% concentration in gas condensate with volume of 1-2 m3 per each meter of gas net pay with its further flushing to the stratum and formation of water shutoff screen in the productive stratum thus pushing stratal water out from the bottomhole to the stratum depth radially. Then through annular space between the flexible pipe and production tubing injection of the second package of hydrophobisated compound is made containing ethyl silicate ETC-40 with 100% concentration in volume of 0.4-0.6 m3 per each meter of gas net pay with its further flushing to the stratum by gas condensate in the volume of production tubing and inner space of the well - production string below the tubing shoe. Then running in of a flexible pipe is repeated to the interval of gas-water contact, water-repellant organosilicon liquid GKZH-11N is injected through the flexible pipe in volume of 0.10-0.15 m3 per each meter of water-bearing thickness of the stratum, return washing of the well during 2 cycles with back pressure. The flexible pipe is removed from the well; the latter is withheld for reaction under pressure.

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3 ex, 4 dwg

FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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18 cl, 6 dwg

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24 cl, 5 dwg

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27 cl, 11 dwg

FIELD: oil and gas industry.

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10 cl, 6 dwg

FIELD: oil and gas industry.

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2 cl, 4 dwg, 1 tbl

FIELD: oil and gas production.

SUBSTANCE: invention relates to insulating formation water inflow in gas and gas condensate wells with the aid of coltubing techniques. In particular, flexible conduit is descended through the tube space of well operated under pressure to the bottom with the aid of coltubing installation. Latches on tube and annulus spaces are opened. Well hole is filled through flexible conduit with gas condensate. Grouting mortar is prepared in preparation block by mixing cement mortar with setting retardant and mortar flowability enhancer in a calculated amount needed to prevent formation water inflow. Further, flushing fluid, e.g. methanol, is pumped through flexible conduit in amount constituting 0.3-0.6 volume of flexible conduit. Annulus space is closed and grouting mortar is pumped through flexible conduit in amount required to fill well hole in interval of water-inflow part of formation. When grouting mortar in hole rises to specified height, tube space is closed and grouting mortar contained in flexible conduit is forced into water-inflow part of formation by in series pumped flushing fluid and displacing solution: for example first methanol in amount 1.0-1.3 volumes of flexible conduit and then gas condensate in required amount, which however does not exceed internal volume of flexible conduit, until grouting mortar begins being pumped in amount of 0.3-0.5 volumes of flexible conduit. Then tube and annulus spaces of well are opened and gas condensate begins being simultaneously pumped into tube and annulus spaces in order to prevent rise of grouting mortar therein above interval of the water-inflow part of formation. Thereafter, bottom of flexible conduit is raised by 1 m above indicated interval and excess of grouting mortar is cut and washed away with gas condensate passed through flexible conduit into tube space, where excess grouting mortar remains in fluid state. After cement setting expectation time, flexible conduit is descended to the top of cement column and tests the latter for strength applying 4.0-5.0 kN loading by means of injector of coltubing installation through flexible conduit. Finally, cement bridging is subjected to hydraulic pressurization and flexible conduit is removed from well.

EFFECT: enabled formation water inflow insulation without killing of well and restricted pollution of water-inflow part of formation.

3 cl, 1 dwg

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EFFECT: higher efficiency.

1 ex

FIELD: oil and gas production.

SUBSTANCE: bottom area of formation is treated with hydrophobic agent, in particular solution of ethylene/vinyl acetate copolymer expressed by general formula [-CH2-CH2-C(CH3COO)H-CH2-]n, where n=7000-10000, in hydrocarbon solvent.

EFFECT: increased source of inexpensive hydrophobic agents with improved adhesion properties, intensified oil recovery due to increased depth of penetration of hydrophobic agent into formation, improved environmental conditions in development of oil formations, and reduced oil production expenses.

2 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: composition is made up of 90.0-95.0% sodium silicate solution with concentration 1.36 g/cm3 and silica modulus 3.0, 3.0-8.0% alkali metal silicofluoride, 1.0-4.0% wood flour, and 1.0-4.0% triacetine. Composition can be used during repair operations on oil production stings, when disabling formations, and when confining water inflow.

EFFECT: increased insulation capacity of grouting compositions.

1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum nitrate, chrome nitrate, iron nitrate, magnesium nitrate, barium nitrate, calcium nitrate or their mixtures.

EFFECT: higher efficiency.

2 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum acetate, chrome acetate, iron acetate, magnesium acetate, copper acetate, barium acetate, manganese acetate, calcium acetate or their mixtures.

EFFECT: higher efficiency.

1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum sulfate, chrome sulfate, iron sulfate, magnesium sulfate, copper sulfate or their mixtures, or their alums with common formula MIMIII(SO4)

.2
12H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn.

EFFECT: higher efficiency.

2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes forming a screen of viscous-elastic mass in well via interaction of working liquid pumped into well in form of alkali waste of kaprolaktam production or its solution, with influx liquid. Necessary speed of transformation of viscous-elastic mass and intensiveness of filling of well adjacent area with it is adjusted by mode of pressing of working liquid into influx zone. For this purpose pressure increase is alternated with pressure decrease. Pressure is decreased for 10-50% from achieved maximum pressure. Relation of exposure time for increased pressure to decreased pressure time is taken in limits 1.1-5.0.

EFFECT: higher efficiency.

7 cl, 1 ex

FIELD: oil industry.

SUBSTANCE: compound has carbomide, urotropine and water, additionally has chlorine iron with following relation of components in percents of mass: carbomide 6.0-16, urotropine 5.0-8.0, chlorine iron 5.0-10, water the rest.

EFFECT: higher efficiency.

8 ex, 2 tbl

FIELD: oil and gas industry.

SUBSTANCE: method includes adjustment of pumping and dosing equipment on basis of amounts of components and their feeding time. Multi-component technological system is forced into well. Adjustment of pumping and dosing equipment is performed by means of frequency converters. Frequencies, set at frequency converter of forcing pump electric engine, at frequency converter of linker-feeding pump electric engine and at frequency converter of powdered polyacrylamide dosing pump electric engine are determined from mathematical formulae. Plant has drift dosage means for powdered polyacrylamide, drift dosage means for powdered components, two ejector mixers, mixing tank, forcing pump, linker tank. Electric engines of forcing pump, linker pump, first and second drift dosage devices are provided with frequency converters. First and second ejector mixers are provided with replaceable nozzles, with diameter 4.5-8.0 mm to provide for 150-250 m3/day plant productiveness.

EFFECT: higher precision.

2 cl, 2 dwg, 1 ex, 1 tbl

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