阅读说明：本技术 一种新型复合射孔枪 (Novel composite perforating gun ) 是由 李华 于 2019-10-12 设计创作，主要内容包括：本发明提供一种新型复合射孔枪,属于油田完井技术领域,包括枪头、射孔枪身、枪尾,射孔枪身表面开设有若干盲孔,射孔枪身内部设有弹架,弹架表面开设的装弹孔与盲孔相对应,盲孔呈倒锥形,且盲孔的倾斜面上固连有对称的卡块,对称的卡块之间插接有挡板,挡板与盲孔的倾斜面的接触部位设有O形圈。本发明能将射孔弹较好的固定在装弹孔内,保证了射孔枪的稳定性,盲孔的设计可有效提高射孔弹在枪体内的炸高,有利于提高射孔弹的穿深,引爆后射孔枪无毛刺、枪孔不变形,还能有效的降低地层污染。(The invention provides a novel composite perforating gun, which belongs to the technical field of oil field well completion and comprises a gun head, a perforating gun body and a gun tail, wherein a plurality of blind holes are formed in the surface of the perforating gun body, a bullet rack is arranged in the perforating gun body, bullet loading holes formed in the surface of the bullet rack correspond to the blind holes, the blind holes are in an inverted cone shape, symmetrical clamping blocks are fixedly connected to the inclined plane of the blind holes, a baffle is inserted between the symmetrical clamping blocks, and an O-shaped ring is arranged at the contact part of the baffle and the inclined plane of the blind holes. The invention can better fix the perforating bullet in the bullet loading hole, ensures the stability of the perforating gun, can effectively improve the explosive height of the perforating bullet in the gun body by the design of the blind hole, is beneficial to improving the penetration depth of the perforating bullet, has no burr and no deformation of the gun hole after detonation, and can effectively reduce stratum pollution.)

1. The utility model provides a novel compound perforation gun, includes rifle head (1), perforation rifle body (5), rifle tail (8), its characterized in that: a plurality of blind holes (4) have been seted up on perforation rifle body (5) surface, perforation rifle body (5) inside is equipped with bullet frame (9), dress bullet hole (6) that bullet frame (9) surface was seted up are corresponding with blind hole (4), blind hole (4) are the back taper, and link firmly symmetrical fixture block (14) on the inclined plane of blind hole (4), the symmetry it has baffle (13) to peg graft between fixture block (14), the contact site on the inclined plane of baffle (13) and blind hole (4) is equipped with O shape circle (12).

2. The novel composite perforating gun as claimed in claim 1, wherein: one end of the perforating gun body (5) is connected with the gun head (2), the other end of the perforating gun body (5) is connected with the gun tail (8), and the gun head (2) is connected with the cable (1).

3. The novel composite perforating gun as claimed in claim 1, wherein: the bullet frame (9) is towards the one end of rifle head (2) and passes through threaded connection with solid fixed ring (3), bullet frame (9) is equipped with seal assembly (7) towards the one end of rifle tail (8), seal assembly (7) comprise retaining ring and rubber circle.

4. The novel composite perforating gun as claimed in claim 1, wherein: the right side of the sealing assembly (7) is provided with an explosion joint (21), the middle of the explosion joint (21) is connected with a central pipe (19), fracturing gunpowder (22) is arranged on two sides of the central pipe (19), and the end part of the right side of the central pipe (19) is filled with ignition gunpowder (20).

5. The novel composite perforating gun as claimed in claim 1, wherein: the bullet loading hole (6) edge of bullet frame (9) is equipped with fastening components (11), fastening components (11) are including roller bearing (17) of locating bullet frame (9) inner wall, roller bearing (17) outside cover is equipped with spacing ring (16), spacing ring (16) surface ring cloth has the shrinkage pool, the horizontal direction of spacing ring (16) be equipped with shrinkage pool assorted rubber ball (15), be equipped with cardboard (18) between the shrinkage pool of spacing ring (16) surface setting, cardboard (18) link firmly with spacing ring (16).

6. The novel composite perforating gun as claimed in claim 1, wherein: the bullet loading holes (6) are through holes penetrating through the left side wall and the right side wall of the bullet rack (9), the bullet loading holes (6) are spirally distributed on the surface of the bullet rack (9), and perforating bullets (10) are installed in the bullet loading holes (6).

7. The novel composite perforating gun as claimed in claim 1, wherein: the steel strength of the perforating gun body (5) is 130-150 grade steel of API standard, the baffle (13) in the blind hole (4) is made of brittle materials, the included angle between the inclination angle of the blind hole (4) and the horizontal plane is 130-135 degrees, and the depth of the blind hole (4) is 7-9 mm.

Technical Field

The invention belongs to the technical field of oil field well completion, and particularly relates to a novel composite perforating gun.

Background

The perforating operation is a vital link in the exploration and development of the oil field, the perforating operation is finished by a perforating gun, the perforating gun is used for perforating a casing and a cement sheath which seal an oil-gas production layer underground and deeply penetrate into the oil-gas layer to form a fluid channel for communicating a shaft and the oil-gas production layer, and the conventional energy-gathering perforating gun is commonly used in the oil field.

The shaped charge perforator is mainly used for perforating oil and gas wells, and a perforating gun is a main component of the shaped charge perforator. At present, as the volume of the perforating bullet is larger and smaller, the explosive height in the gun body is smaller and smaller, and the perforation depth of the perforating bullet is improved, various forms of inner blind hole perforating guns appear in recent years. However, the existing perforating gun with inner blind holes has many defects, such as the inner blind holes are directly mirrored on the inner wall of the perforating gun, the method needs special equipment, and the production efficiency is extremely low. For example, firstly drilling a through hole on the gun body wall and then welding or gluing a plugging sheet, the inner blind hole perforating gun processed by the method has low sealing and bearing performance and is easy to leak.

Disclosure of Invention

The invention aims to provide a novel composite perforating gun, which can better fix a perforating bullet in a bullet loading hole, ensure the stability of the perforating gun, effectively improve the explosive height of the perforating bullet in a gun body by the design of a blind hole, is favorable for improving the penetration depth of the perforating bullet, has no burr and no deformation of a gun hole after detonation, and can effectively reduce stratum pollution.

The scheme adopted by the invention for realizing the purpose is as follows: the utility model provides a novel compound perforating gun, includes rifle head, perforating gun body, rifle tail, and a plurality of blind holes have been seted up on perforating gun body surface, and the inside bullet frame that is equipped with of perforating gun body, the dress bullet hole that bullet frame surface was seted up is corresponding with the blind hole, and the blind hole is the back taper, and links firmly the fixture block of symmetry on the inclined plane of blind hole, and it has the baffle to peg graft between the fixture block of symmetry, and the contact site on the inclined plane of baffle and blind hole is equipped with O shape circle. The blind hole on the surface of the perforating gun corresponds to a bullet loading hole, the blind hole has good sealing performance and pressure relief performance through the design, meanwhile, a baffle which is thinner than a gun body is arranged in the blind hole, the area is weak, the baffle can be rapidly exploded after the perforating bullet is detonated, the energy loss of the penetrating jet is small, the jet velocity gradient is increased, the high penetration depth performance of the perforating gun is improved, meanwhile, a plurality of cracks which are not controlled by the minimum principal stress of the stratum are generated on the stratum, the stratum pollution is reduced, the flowing efficiency of fluid in the stratum is also improved, the good pressure relief function is realized, the impact force of the perforating bullet is large, the friction between the blind hole and the perforating bullet is greatly reduced due to the inverted cone-shaped structure, the generation of burrs in the blind hole is completely avoided after perforation, the explosion height of the perforating bullet in the gun body is also increased, symmetrical clamping blocks are connected on the inclined plane of the blind hole, the arrangement can increase the utilization times of the perforating, the safety of the perforating gun is ensured.

Preferably, one end of the perforating gun body is connected with the gun head, the other end of the perforating gun body is connected with the gun tail, and the gun head is connected with the cable. The gun head is connected with the cable, the cable is used for moving the perforating gun to a position needing perforating, and the gun head and the gun tail are assembly parts of a perforating gun body.

Preferably, one end of the bullet frame facing the gun head is in threaded connection with the fixing ring, one end of the bullet frame facing the gun tail is provided with a sealing assembly, and the sealing assembly is composed of a check ring and a rubber ring. The fixing ring is connected to the inner wall of the gun head, the bullet frame is connected with the fixing ring through threads to be fixed firmly, the installation is convenient, the bullet frame can be prevented from being broken and moving downwards under strong impact, meanwhile, the other end of the bullet frame is connected with the sealing assembly, on one hand, the bullet frame can resist impact force generated during multi-stage detonation, and on the other hand, potential safety hazards caused by looseness of all parts of the perforating gun due to jolting and vibration in the transportation and well descending processes are avoided.

Preferably, the right side of the sealing assembly is provided with an explosion joint, the middle part of the explosion joint is connected with a central pipe, fracturing powder is arranged on two sides of the central pipe, and the end part of the right side of the central pipe is filled with ignition powder. The setting all is located the body of a gun inside, detonate and shoot and connect the detonation to turn into the burning through burning after the bullet hole, the high temperature ignition powder in the fracturing powder centre bore is ignited to the flame that the burning connects the production, the high temperature that the ignition powder produced makes the fracturing powder burning, this powder use amount is unrestricted, the gas that the powder produced can directly be sprayed in the stratum, make the stratum around the pit shaft produce many cracks, the shear stress component of this crack extending direction makes the crack produce the micro-dislocation, thereby show the degree of depth and the width that has increased perforation and stratum communication, the seepage flow area in the stratum flow direction well has been increased, the stratum pollution has effectively been reduced.

Preferably, the edge of the bullet loading hole of the bullet frame is provided with a fastening assembly, the fastening assembly comprises a roller arranged on the inner wall of the bullet frame, the outer side of the roller is sleeved with a limiting ring, concave holes are annularly distributed on the surface of the limiting ring, rubber balls matched with the concave holes are arranged in the horizontal direction of the limiting ring, a clamping plate is arranged between the concave holes formed in the surface of the limiting ring, and the clamping plate is fixedly connected with the limiting ring. Fastening components in the bullet rack can fix the perforating bullet and also further improve the stability of perforating bullet rack when detonating, in the bullet rack was gone into to the perforating bullet, fastening components can adjust according to the size of perforating bullet, the cardboard can support the lateral wall of perforating bullet when filling in, the roller bearing also can drive the spacing ring and make corresponding roll, block back rubber ball and can fix in the shrinkage pool of spacing ring, prevent that the perforating bullet from dropping or taking place the shake at the detonation in-process in the loading bullet hole, reach the perforation degree of depth of settlement, influence oil gas output.

Preferably, the bullet loading holes are through holes penetrating through the left side wall and the right side wall of the bullet rack, the bullet loading holes are spirally distributed on the surface of the bullet rack, and perforating bullets are installed in the bullet loading holes. The perforating bullet is put into the charge hole, snatchs the body with the perforation and delivers to the relevant position, need not angle of adjustment, simple to operate, and the assembly is simple, can form a plane of rupture that is close to being on a parallel with the stratum after detonating, and the pressure when this plane of rupture guide fracturing prolongs this direction extension, can form along the fracturing gap of pit shaft radial distribution, improves the pressure effect, increases the oil recovery productivity.

Preferably, the steel strength of the perforating gun body is API standard-steel grade, the baffle plates in the blind holes are made of brittle materials, the included angle between the inclined angle of the blind holes and the horizontal plane is 130-135 degrees, and the depth of the blind holes is 7-9 mm. The steel with the strength has good supporting effect, high pressure resistance inside the steel, small deformation amount generated after perforation and repeated utilization, the inner baffle plate of the blind hole is made of brittle materials, and when the steel is subjected to strong impact or jet penetration, the sealing plug is broken into small pieces and falls to the bottom of the well, so that the perforating gun cannot be stuck in a sleeve to cause underground accidents, the inclination angle of the blind hole is within the range, burrs cannot be generated by ejection of the ejection hole, and any use of the gun body of the deep hole cannot be influenced.

Compared with the prior art, the invention has the beneficial effects that: the perforating gun can rapidly break the baffle after being detonated, the energy loss of weak jet flow passing through the baffle is small, the perforating effect is correspondingly improved, the friction and extrusion between a perforating bullet and the blind hole during perforating can be reduced due to the special design of the blind hole, burrs of the blind hole after perforating are avoided, the explosive height of the perforating bullet in the gun body is increased, the penetration depth of the perforating bullet is favorably improved, the fastening assembly arranged at the edge of the charge hole of the charge frame prevents the perforating bullet from falling off in the charge hole or shaking in the detonating process, the set perforating depth cannot be reached, the oil gas yield is influenced, the explosive is ignited by the explosive joint, gas generated by explosive can be directly sprayed to the stratum, the stratum generates cracks, the seepage area of the stratum flowing into a well is increased, and the stratum pollution is effectively reduced.

The novel composite perforating gun provided by the invention overcomes the defects of the prior art, and is reasonable in design and convenient to operate.

Drawings

FIG. 1 is a schematic diagram of the internal structure of a novel composite perforating gun of the present invention;

FIG. 2 is a schematic view of the construction of the cartridge holder of the present invention;

FIG. 3 is a schematic view of the internal structure of the blind hole of the present invention;

FIG. 4 is an enlarged view of the fastener assembly of the present invention;

FIG. 5 is a graph comparing experimental perforation gun blow-up;

FIG. 6 is a comparative graph of penetration test;

FIG. 7 is a comparison graph of the height of the burr in the blind hole.

Description of reference numerals: 1, a cable; 2, gun heads; 3, fixing a ring; 4, blind holes; 5, perforating gun body; 6, loading a bullet hole; 7 sealing the assembly; 8, gun tail; 9, a bullet rack; 10 perforating charge; 11 fastening the assembly; a 12O-ring; 13 baffle plate; 14, a fixture block; 15 rubber balls; 16, a limiting ring; 17 a roller; 18 clamp plates; 19 a central tube; 20 ignition charge; 21, burning and exploding a joint; 22 fracturing powder.

Detailed Description

The invention is described in further detail below with reference to examples and figures: