UA79373U - Method for extraction of hydrocarbon raw material from oil-gas-condensate beds - Google Patents

Abstract

A method for extraction of hydrocarbon raw material from oil-gas-condensate seams includes preliminary treatment of bottomhole formation zone with catalytically-active fluid with following introduction of promoter of atomic hydrogen formation with following treatment with thermo-chemical mixture for initiation, extraction of hydrocarbon raw material is carried out in autocatalytic flow mode.

Description

A useful model belongs to the oil and gas industry, in particular to the methods of chemical influence on the PZP, namely by autocatalysis in the near-bottom zone of the formation (PZP).

The purpose of the useful model is to increase the efficiency of extraction and connection to the development of difficult-to-extract resources of hydrocarbon raw materials, including retrograde condensate of spent gas-condensate fields by improving the rheological properties of the formation fluid by changing the chemical composition of hydrocarbons.

There is a well-known method of increasing oil and gas production by means of hydraulic fracturing of productive layers, which lead to an increase in the formation of cracks in the PZP and, as a result, to the improvement of its drainage properties.

This method is widely used in the practice of developing oil and gas fields. But its consequences, such as limitations when used in deep wells - the required working pressures range from 120 to 200 MPa, the high cost of work and equipment, the complexity of the process, as well as the low percentage of successful operations, do not allow to make its use more universal for various physical and chemical properties of hydrocarbon deposits.

The method of thermochemical processing of PZP, which is described in Mo patent 2126084 VY.S16E21843/24843/25, publ. 02/10/1999. This method consists in the fact that additional pressure is artificially created in the PZP with the help of gas-forming 3-stage exothermic reactions carried out between compositions that burn in water - hydroreactive fuel-oxidizing mixtures and high-molecular fractions of hydrocarbon fluids. At the same time, both the rock properties of the productive reservoir and the chemical composition of the reservoir fluid in the zone up to 0.5 m around the wellbore change.

Chemical transformations of the fluid and repeated changes in the rock structure of the productive layer provide an increase in permeability: in sandstone by 7-11 times, siltstone by 13-19, mixed rock by 15-20 times.

The disadvantage of this process is its one-time nature, i.e., after a short period of its flow (several tens of seconds), it stops, and subsequently the intensification process slows down and after a short period (up to 60 days) stops.

The basis of a useful model is the task of creating a method of hydrocarbon extraction

From raw materials from oil and gas condensate layers, which would ensure a longer period of operation of the wells and a greater depth of extraction of raw materials.

The task is solved as follows: a method of extracting hydrocarbon raw materials from oil and gas condensate reservoirs, which includes pre-treatment of the near-welling zone of the reservoir with a catalytically active liquid followed by the introduction of a promoter for the formation of atomic hydrogen and subsequent treatment with a thermochemical mixture for initiation to a temperature of 120-200"C, which will allow to transfer method of extracting hydrocarbon raw materials in the autocatalytic flow mode.

As a result of the application of this method, the chemical composition of hydrocarbons is transformed, namely: components that increase the viscosity of the fluid, such as high-molecular paraffinic hydrocarbons, condensed aromatic compounds, bitumen and asphaltenes are hydrogenated, that is, saturated with hydrogen, cracked into lower molecular weight compounds, including and to gaseous ones. This leads to obtaining hydrocarbons with low rheological properties, which allow to improve their drainage, and thereby increase the flow rate of the wells.

Thus, in the proposed method, the chemical transformation of hydrocarbon compounds occurs continuously for a considerable period of time - up to 240 days. The extracted raw material has a qualitatively better composition than in the above examples. The total cost of intensification is 3-5 times lower than that of known methods. The proposed method is also more ecological, since it does not use components of the I-II hazard class.

The claimed technical result: increase in extraction of hydrocarbon raw materials, improvement of the composition of extracted raw materials, increase in the service life of wells, increase in the depth of extraction of raw materials and improvement of environmental friendliness of the method.

The causal relationship between the essential features of the proposed useful model allows to obtain the technical result indicated in the statement of the problem.

The method is implemented as follows.

The well is prepared for production intensification operations and is equipped with the necessary equipment for capital repair works: a drilling machine of appropriate load capacity, a set of drill and pump-compressor pipes, special tools, pump and compressor units, and an averaging tank.

After washing the PZP with a micellar solution of a surface-active substance (surfactant), prepare a solution of the appropriate concentration of a catalytically-active substance (the concentration and ratio of the hydrogenating and cracking parts for each well are established - experimentally) in the volume necessary for the complete replacement of the reservoir fluid in the radius from the well well, no less than the formation perforation zone. A column of drill or pump-compressor pipes is assembled, which is lowered to the PZP, and the prepared solution of the catalytic mixture is started to be injected. After the layer has received the catalytically active substance, the system is maintained for 3-5 days with repression on the layer under the minimum possible pressure, which does not allow both a decrease and an increase in the level of liquid in the wellbore.

After exposure, the layer is unloaded and treated with a promoter according to the same scheme.

In the event that the bottom hole temperature is lower than 120 "С, it is necessary to carry out thermochemical treatment of PZP to initiate the processes of catalytic hydrogenation and cracking.

The effectiveness of the proposed method is confirmed by the results of laboratory studies of the processes of hydrogenation and subsequent cracking at the core sample research facility

UDPK-1, which are listed in the table.

Table. Results of studies on the method of extracting hydrocarbon raw materials by autocatalysis in PZP. Research was conducted on samples of natural core, which was treated with hydrocarbon material and an aqueous solution of a bifunctional catalytic mixture.

A promoter was introduced into the hydrocarbon samples - 2.595 of the sample volume. In the process of research, the dependence of filtration on physical parameters - temperature and pressure, fractional composition and specific gravity - was studied.

Title and General

Characteristics and composition of Mo Gustin Viscosity, about EM. Molecular Permeability of p/p hydrocarbon oil kg/dmZ sst | Driven weight, then the parameters of the volume. (about; samples, experiments seob. 1111111 21111117111113 1415161 71 8 | 9

Condensate Start

Zagoryansky GKR, boiling point 72 St. MeZ, (PK) 1

Sample of natural 90.0 |297І0.829| 42 | 90 | 249 | 276 15 95 vol. boiling point

I am requesting p/o ooo Peoove| 1,01,575

Zagoryansky GKR, -120С, Р-?7 MPa | 90.0 2282 2 | The core sample was treated with catalytically active) KK 287 liquid, porosity 15 95 by volume

I am applying for a PRI at the address 7161 and 1035

Zagoryansky GKR, -120С, Р-7ZMPa | 90.0 2 2Ю-/"|249

Core sample,

With | treated with catalytically active liquid, additive! CC 261 promoter, porosity 15 Fo volume.

Continuation of 1111 2е111117171з3 14| 51 61 7 | 8 | 9

Condensate ko 172Й 11111111 winter NESTI SE PNESLY NS NE NO KHE 4|-150С,р-73 MPa | 90.0 297

Sample of natural core, porosity - CC 302 15 95 vol.

Condensate Ko 156Y 7 y771117y111171С1111yg1 nnavnya NSSNY FROM SEONESIS ST NIC NOSEZNYA -8В150С,р-7.3 MPa 90.0 22280) | Sample of natural core treated with catalytically active) КК 285 liquid, porosity 95 volume

Condensate ko t43Y7 11111111 i-150С, r-7, MPa | 90.02 | 247)

Sample of natural core, treated with catalytically active liquid, additive! CC 257 promoter, porosity 15 Fo volume.

Condensate to 17017 1111 detnyu pe) ovo svoe yuyu | 5 7 -6RgООС,р-7.3 MPa | 90.0 Y |293)

Natural core sample (porosity) CC 296 15 95 vol

Condensate cat 1111 i-200С, r-7.3Mpa 9000. 1277

Sample of natural core treated with catalytically active) KK 292 liquid, porosity 15 95 volume

Condensate ko 127Й1 g и-2г00С, р-7.3 Mpa | 90.0 2661

Natural core sample treated with catalytically active 275 liquid, promoter additive, porosity 15 95

From the above results, it can be seen that on samples of natural core, untreated with catalytically active liquid and promoter, the properties of the condensate practically do not change under the same conditions (Yii, p), as in the following experiments. In the experiments, when the core sample was treated with a catalyst without the introduction of the atomic hydrogen formation promoter, the properties of the condensate changed insignificantly, and in the experiments with the introduction of the promoter, such properties as the fractional composition, density, molecular weight, and permeability changed drastically in the direction of improvement.

The confirmation of the highly efficient action of the catalytic method of extracting hydrocarbon raw materials is the experimental and industrial tests carried out at the Mo 79 Kotelevsky well

GKR As a result of tests at the wellhead, the following products were obtained: gas - throughput/day - 20 thousand m3 (before tests 0.0 thousand m3), condensate - 3.0 m3/day (before tests 0.0 mu).

The resulting condensate was characterized by the following physical and chemical properties: - fractional composition: pc-357С to volume 10-507С 20-60 30-74"7С 40-78"7С 50о-8270

KK-1187S - kinematic viscosity - 0.272 Pa"s"10-3 at 1-20 70 - density - 703 kg/m3 - molecular weight - 79 units.

The properties of the condensate of the Kotelevsky GKR before the tests had the following indicators: - fractional composition: pc- 71" to volume 10-11870 20-13970 30-16270

From 40-1837С 5о0о-2037С

KK-356"7С - kinematic viscosity - 1.74 Pax"10-3 at 1-207С - density - 793 kg/m3 - molecular weight - 216 units.

This useful model can be implemented in industrial settings.

Claims (1)

USEFUL MODEL FORMULA The method of extracting hydrocarbon raw materials from oil and gas condensate formations, which includes pre-treatment of the near-welling zone of the formation with a catalytically active liquid followed by the introduction of a promoter of the formation of atomic hydrogen and subsequent treatment with a thermochemical mixture for initiation to a temperature of 120-200 "С, which will allow transferring the method of extraction of hydrocarbon raw materials into the autocatalytic flow mode. 0 KomputernaverstkaA, Kryzhanivskyi (00000000 State Intellectual Property Service of Ukraine, str. Urytskogo, 45, m. Kyiv, MSP, 03680, Ukraine SE "Ukrainian Institute of Industrial Property", str. Glazunova, 1, m. Kyiv - 42, 01601