CN102242616A

CN102242616A - Elastic wing casing pipe for improving second interface well cementation quality

Info

Publication number: CN102242616A
Application number: CN2010101690059A
Authority: CN
Inventors: 马佳囡
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-12
Filing date: 2010-05-12
Publication date: 2011-11-16

Abstract

The invention belongs to the field of well cementation casing pipes of well drilling in oil fields, and particularly relates to an elastic wing casing pipe for improving second interface well cementation quality. The elastic wing casing pipe consists of a casing pipe (1) and an elastic wing (2), wherein the elastic wing (2) is arranged on the outer wall of the casing pipe (1) obliquely. A second interface can be brushed, rotational flow and turbulent flow are formed by injecting cement paste during well cementation, the replacement effect and cleanliness are high, the cementation strength and cementation rate of the second interface can be improved, an adhering sand casing pipe and a casing pipe centralizers can be replaced, and the interlayer pressure blowby, interlayer gas blowby and interlayer liquid blowby of a first interface and the second interface of well cementation can be prevented.

Description

A kind of bullet wing sleeve pipe that improves the second interface cementing quality

Technical field

The invention belongs to oil drilling well cementation sleeve pipe field, a kind of specifically bullet wing sleeve pipe that improves the second interface cementing quality.

Background technology

In oil drilling well cementation was produced, well cementation used the sleeve pipe of what type directly to influence cementing quality, influence the oil well oil yield and influenced oil well application life.At present the used sleeve pipe of well cementation roughly is divided into two classes, and 1, the ordinary casing well cementation, the shortcoming of this casing cementing is: the cementing quality of the second interface of sleeve pipe and cement sheath gluing-interface and cement sheath and pit shaft gluing does not have safeguard measure.2, Casing with external adhered sand layer well cementation, advantage is that an interface cementing quality is had the raising measure, shortcoming is that the second interface cementing quality is not had safeguard.For example when workover is got sleeve pipe, the sleeve pipe of transfering in the well 100% has the cementing concrete ring, the cementing strength of this explanation second interface is good not as an interface, and second interface is the weak link of well cementation, and the measure that present national drilling well does not all improve the second interface cementing quality in producing.

Summary of the invention

Purpose of the present invention is exactly in order to overcome the shortcoming and defect of above-mentioned existence, a kind of bullet wing sleeve pipe that improves the second interface cementing quality to be provided, and its effect is the cementing quality that can improve second interface in the cementing quality that improves an interface again.It is can scrubbing action be arranged to the borehole wall by shaking sleeve pipe at tilting affixed elasticity fin on the sleeve outer wall up and down when cementing the well, and produces eddy flow and turbulent flow when injecting cement slurry cementing, and is good to two interface detergencies, the displacement efficiency height.Improve 40% through the second interface of cleaning than well cementation gluing rate with two kinds of casing cementing modes described in the background technology.

The present invention is achieved in that it comprises: sleeve pipe (1) and bullet wing (2) is characterized in that: tilting bullet wing (2) on sleeve pipe (1) outer wall.Playing the mode that wing (2) is fixed on the sleeve pipe (1) is: bonding, welding, clamping, ring set connects with bolton in a kind of or combination.Play being shaped as of wing (2): a kind of or combination in square, rectangle, two arc, fan-like pattern, hurricane band shape and the empty shape.Playing wing (2) is: elastomeric material, height and length greater than 3 millimeters, thickness greater than 0.3 millimeter, quantity more than or equal to 1, pitch is greater than 20 millimeters.

The present invention is lowered in the well cementation interval of oil well in use, in the lower going-into-well internal procedure, mud is scrubbed and scraped to the pit shaft wall energy, before well cementation, shake up and down during well-flushing and play the wing sleeve pipe and can scrub the well bore wall secondary, cement paste is in annular space and revolves turbulent condition and improved wash degree and displacement efficiency when injecting cement slurry cementing, has improved glued area.Well cementation back bullet wing expands and be frozen into one with cement sheath to well bore wall, thereby has improved the cementing strength of second interface.

Advantage of the present invention is:

1, cement paste is and revolves turbulence replacement efficient height when well cementation;

2, second interface is had the brushing effect, the wash degree height has improved glued area of second interface and intensity;

3, save whole casing stabbing boards and Casing with external adhered sand layer;

4, behind the perforation cement sheath crack length less than spacing of fin, can prevent that liquid, pressure, vapour are scurried in two interfaces of interlayer in well.

5, cost is low, increases drilling cost less than 1%.

Description of drawings:

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the structural representation that the present invention combines with viscosity sand layer.

Fig. 3 is the use schematic diagram that the present invention cements the well.

Among the figure: (1)-sleeve pipe, (2)-bullet wing, (3)-cementing concrete ring, (4)-well bore wall, (5)-sand grains layer.

Application example:

Among Fig. 1: (1) be sleeve pipe, (2) for playing wing, will play on the tilting outer wall that is secured to sleeve pipe (1) of wing (2).The affixed mode that plays wing (2) is: bonding, welding, clamping, a kind of or combination that ring set connects with bolt in fastening.Play being shaped as of wing (2): a kind of or combination in square, rectangle, two arc, fan-like pattern, hurricane band shape and the hole shape.Playing wing (2) is: elastomeric material, height and length greater than 3 millimeters, thickness greater than 0.2 millimeter, quantity more than or equal to 1, pitch is greater than 20 millimeters.

Among Fig. 2: (1) is that sleeve pipe, (2) are the sand grains layer for bullet wing, (5), the surperficial binding sand granulosa of sleeve pipe on the basis of Fig. 1 (1) (5), and the viscosity of sand grains is less than 3 millimeters.This structure the advantage of this patent together with the advantages of Casing with external adhered sand layer, the cementing quality at two interfaces all is improved.

Among Fig. 3: (1) is that sleeve pipe, (2) are sand grains layer for cementing concrete ring, (4) for well bore wall, (5) for bullet wing, (3), and this figure (3) is the use schematic diagram of the present invention's well cementation.The product of a plurality of Fig. 1 or Fig. 2 is connected into casing string be lowered into, between well bore wall (4) and sleeve pipe (1), inject cement paste in the formed ring set and solidify the back and form cement sheath (3) by in well bore wall (4) annular space.Can the brushing second interface when in well bore wall (4), being lowered to casing string, shake casing string secondary is scrubbed second interface and is made its detergency good when well-flushing, when injecting cement paste, be and revolve turbulent condition, the displacement efficiency height, play bloated the going up of wing and can improve well cementation intensity, improve the glued area of second interface more than 40% through using to add up to well bore wall (4).

This product used in oil field, grand celebration apricot hilllock and triumph oil field, the Bin Nanwang village respectively at 2006 and 2007, going into the well, 269 mouthfuls of effects are fine altogether, the one interface well cementation factor of merit on average improves 9%, the glued rate of second interface on average improves 40%, cement sheath intensity improves 169% through test, second interface porosity decreased average about 60% can prevent to scurry liquid, vapour, pressure at two interfaces at the oil reservoir of oil well, and the crack length that makes cement sheath behind the perforation is less than spacing of fin.The material of fin is finalized the design now, and shape more meets fluid and mineshaft annulus characteristic.Use back surface well muzzle pipe oil impregnate all to eliminate, its economic benefit is very considerable.

Claims

1. bullet wing sleeve pipe that improves the second interface cementing quality, it contains: sleeve pipe (1) and play wing (2) is characterized in that: at sleeve pipe (1) the tilting bullet wing of outer wall (2).

2. a kind of bullet wing sleeve pipe that improves the second interface cementing quality according to claim 1 is characterized in that: play the tilting mode of wing (2) and be bonding, welding, clamping at sleeve pipe (1) outer wall, ring set connects with bolton in a kind of or combination.

3. a kind of bullet wing sleeve pipe that improves the second interface cementing quality according to claim 1 is characterized in that: play being shaped as of wing (2): a kind of or combination in square, rectangle, two arc, fan-like pattern, hurricane band shape and the hole shape.

4. a kind of bullet wing sleeve pipe that improves the second interface cementing quality according to claim 1 is characterized in that: playing wing (2) is: elastomeric material, height and length greater than 3 millimeters, thickness greater than 0.3 millimeter, quantity more than or equal to 1, pitch is greater than 20 millimeters.