The method of thermochemical treatment of oil reservoir

 

(57) Abstract:

The invention relates to the oil industry and can be used in process operations when removing wax and paraffin deposits and the decrease of the removal of rock particles from the bottom zone. The technical result is to increase the efficiency of the method thermochemical effects on the bottomhole zone and the expansion of its range of application due to volumetric sedimentation near bottomhole zone additional component technology with its subsequent consolidation in the bottomhole formation zone at high temperatures, resulting in lower revenues of sand on the bottom with good performance well. In the method of thermochemical treatment of oil reservoir to remove wax and paraffin deposits, including sequential injection in the impact zone aqueous dispersion of calcium and water, and water use acidified with hydrochloric acid to a pH of not more than 5, when the ratio of hydrochloric acid and calcium in 1,5-2 times more than stoichiometric, before injection of these components into a hole previously injected aqueous suspension of bentonite clay. After conducting the term is th column of the reservoir. 1 C.p. f-crystals.

The invention relates to the oil industry and can be used in process operations when removing asphalt-resin-paraffin deposits and reduce the removal of rock particles from the bottom-hole zone of the well

Prior art

A known method of removing wax and parfenovitch sediments through thermochemical reaction between the alkali metal and water, comprising the sequential injection of hydrocarbon dispersion of the alkali metal and water [1].

The known method of fire and explosive as during transportation and works, and, therefore, not been used in practice.

Closest to the proposed invention is a method of injection into the zone of influence of the water dispersion of granular calcium and weak hydrochloric acid solution with a pH of not more than 5 at a ratio of hydrochloric acid and calcium 1.5-2 more than the stoichiometric [2].

The disadvantages of the method of thermochemical treatment according to the method of [2] is that in wells, reservoirs, which are composed of friable Sandstone, thermochemical exposure may cause increased removal of sand due to the cracking of rocks at high mobimessage impact on the bottom zone and extend its range of application due to volumetric sedimentation near bottomhole zone additional component technology with its subsequent consolidation in the bottomhole formation zone at high temperatures, which leads to the decline of sand on the bottom with good performance well.

Disclosure of the invention

This objective is achieved in that in the method of thermochemical treatment of oil reservoir to remove wax and paraffin deposits, including sequential injection in the impact zone aqueous dispersion of calcium and water, and water use acidified with hydrochloric acid to a pH of not more than 5, when the ratio of hydrochloric acid and calcium in 1,5-2 times more than stoichiometric, before injection of these components into a hole previously injected aqueous suspension of bentonite clay. After conducting thermochemical impact in case of loss of hydroconductivity re-perforation of oil-saturated thickness of the formation.

The physico-chemical nature of the proposed technology is that thermal effects of clay loses water and hardens, and asphalt-resin-paraffin deposits acquire mobility, thereby changing the hydroconductivity the well bottom zone of the zone of influence.

The total amount of aspasie bentonite clay is prepared based penetration is CLASS="ptx2">

The total amount of components thermochemical reaction is calculated at finite temperature near the bottom zone to a predetermined value, which is determined by the condition that the hardening clays occurs at temperatures between 200 and 600oWith depending on their composition and reservoir pressure.

Examples of specific performance

Example 1. Well at a depth of 1100 m, with perforation interval 1043-1048 m, a porosity of 22%, capacity 30 m3/day, the water content of 67%. In the well was pumped 8 m3one percent suspension of bentonite clay based penetration of 2.5 m in radius in water returning interlayer.

Then the well pump 0.18 m320% dispersion of calcium, which is 36 kg of calcium. Then upload 5 m3water, acidified with hydrochloric acid to a pH of 0.15, which provides 128 kg of hydrochloric acid.

The ratio between calcium and hydrogen chloride in the reaction of formation of calcium chloride is 2 with respect to the stoichiometric (64 kg of hydrochloric acid at 36 kg of calcium).

After the reaction, and heating the well increased performance of up to 44 m3/day, so re-perforation was carried out.

Example 2. what vodanet 72%. In the well was pumped 8 m3one percent suspension of bentonite clay based penetration of 2.5 m in radius in water returning interlayer.

Then the well pump 0.18 m320% dispersion of calcium, which is 36 kg of calcium. Then upload 5 m3water, acidified with hydrochloric acid to a pH of 0.15, which provides 128 kg of hydrochloric acid.

The ratio between calcium and hydrogen chloride in the reaction of formation of calcium chloride is 2 with respect to the stoichiometric (64 kg of hydrochloric acid at 36 kg of calcium).

After the reaction and heating oil production decreased to 23 m3/day. Was re-perforation. After that, performance is increased up to 72 m3/day.

Sources of information

1. Pat. RU 2073696.

2. Pat. RU 2148152 (prototype).

1. The method of thermochemical treatment of oil reservoir to remove wax and paraffin deposits, including sequential injection in the impact zone aqueous dispersion of calcium and water, and water use acidified with hydrochloric acid to a pH of not more than 5, when the ratio of hydrochloric acid and calcium in 1,5-2 times bol is pumped aqueous suspension of bentonite clay.

2. The method according to p. 1, characterized in that after thermo-chemical exposure in the event of loss of hydroconductivity re-perforation of oil-saturated thickness of the aquifer.

 

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FIELD: oil and gas production.

SUBSTANCE: invention is intended to protect inner surface of transmission pipelines against asphalt-tar-paraffin deposits and provides appropriate composition containing 0.5-10% polyvinyl alcohol, 0.01-1% nonionic surfactant (FK 2000 PLUS), and water.

EFFECT: prolonged pipeline protection effect of composition and manifested demulsification activity.

1 dwg, 5 tbl, 5 ex

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