SU726301A1 - Composition for setting baths at releasing of drilling tools and casing stuck in a borehole - Google Patents

Description

The invention relates to compositions for installing bathtubs when releasing · seized drilling tools and casing pipes in a well and can be used to eliminate accidents when drilling wells for oil, gas · and other minerals.

Known compositions for installing bathtubs during the release of casing pipes boring in a borehole containing liquid agents, for example oil [1].

A disadvantage of the known compositions is a decrease in their effectiveness with an increase in the depth of the well and the time that has passed since the seizure of drilling tools and pipes, and in the case of alkaline baths, in addition, the likelihood of rock collapse with loss of circulation increases.

Closest to the invention is a composition for installing bathtubs when releasing drilling tools and casing trapped in a well, containing oil and a surfactant, for example disolvan or sulfonol (2].

However, such a composition has a low release efficiency. drilling tools and casing pipes due to its low penetration and lubricity.

The aim of the invention is to increase the efficiency of the release of stuck drilling tools and casing by increasing the penetrating and lubricating ability of the composition.

JAV2C

75-8 5

1-2 4-7 10-16.

2S

To achieve this goal, the composition additionally contains sodium aluminate and resinous substances in the following ratio of ingredients, vol.%:

Oil

Surfactant, e.g. disolvan or sulfonol ^ζ '

Sodium Aluminate Resinous Substances

The technology for the preparation of the composition consists in adding resinous substances and sodium aluminate to the oil and intensively re-melting them at normal temperature for 1.52 hours until a characteristic greenish-bluish tint appears. Subsequently, a surfactant, for example disolvan or sulfonol, is introduced with constant stirring.

♦ <·>

; 3 ‘.., V J 726301

1.05-1.08 200-240

90-110

30-45.

As resinous substances, wood resin or distillation OST is introduced into the resin-turpentine production and other wood-chemical industries.

As a wood resin, for example, pine resin produced in accordance with GOST 11238-65 and having the following physicochemical parameters can be used:

Specific gravity at 20 ° С, g / cm ³ Viscosity, cps KysLotnoe number, mg KOH Ether number, mg KOH

As a still residue, the resin may be. I used, for example, a product manufactured according to TU OP-25-74, characterized by the following indicators:

Specific gravity at 20 ° С, Viscosity at 20 ° С, Acid mg KOH

Essential number, mg KOH. The proposed composition is used to compress various products of wood pyrolysis (pine resin, pine oil. Flotation resin, polymer and bottoms resin) with a difference in the quantitative ratio of ingredients.

The results of determining the effectiveness of various liquid baths to reduce the specific separation force (adhesion value) of a reference sample from clay cake at a pressure of 757 mm Hg and a temperature of 20 ° C show that the specific force of separation of the sample from the crust when installing the bath from the proposed composition is -48 times less than when installing the oil or oil with the addition of sul ..... phonol baths; in this case, an effective decrease in the resistivity of separation of the sample from the crust occurs 2–4 times faster.

The results of the study of the penetrating and lubricating properties of various liquid baths show that the composition reduces the coefficient of friction of the reference sample in clay cake by 3-4.5 times, and the filtration rate through clay cake increases by 3.3-4.1 times.

The proposed composition provides the possibility of releasing drilling tools and casing seized in the well at depths of '3,000 m or more after a long time 5 from the moment of sticking (33-192 hours);

In addition, it costs the time it takes to free the core drilling tools (while standing under the bathtub) by 2–3 times. '.

IQ After the release of seized drilling tools, there is no need to dispose of the proposed composition. The bath can be introduced into the drilling fluid, as it helps to reduce the swelling ”of clay rocks thereby thereby preventing further sticking and gland formation.

The economic effect of the use of the composition is 9.6 thousand rubles. on the.....

one operation. . .

g / cm ³ SDR number

1.03-1.08

49-63

16- 33

17-19. Lays with oder

Claims (2)

Claim 1. Composition for installing bathtubs when releasing · seized in the well of a drilling tool and casing, containing oil and surface -..... a non-active substance, for example disolvan or sulfonol, characterized in that, in order to increase the efficiency of releasing the drill tool and casing by increasing the penetrating and lubricating ability of the composition; it additionally contains sodium aluminate and resinous substances in the following ratio of ingredients, vol.%: Oil Surface active substance Sodium aluminate Resinous substances 2. Composition .. by π. 1, u and i with the fact that in 75-85 1-2 4-7 10-16. l and h about as resinous substances, it contains pine resin or vat 'residues of tar-tar production and other wood chemical industries.