CN1883873A - Perforating gun repair process - Google Patents

Abstract

The present invention relates to a repair process for a multiple perforation apparatus used by oil and gas fields, particularly to a repair process for a gun perforator body. The technical scheme comprises the working procedures of cleaning sewage inside the gun, drilling pre-holes, welding and repairing bullet holes, repairing screws, digging lumens, trying out the pressure, drilling blind holes, repairing external surfaces, re-trying out the pressure and painting. The benefits comprise complex process without large-scale equipment, no change to its explosion-proof function due to no change to its gun body repairing materials, low repairing cost and superior steel material saving. The process meets the environmental protection requirement.

Description

Perforating gun repair process

One, technical field:

The present invention relates to the renovation technique of the multiple perforating system of a kind of oil, gas field use, particularly a kind of perforating gun repair process.

Two, background technology:

Perforation is a key operation in oil, the gas field operation exploitation construction, and the quality of perforating quality not only depends on the performance of priming systems such as perforating bullet, and is also closely related with their carrier-body of a gun.In other words, be exactly material, structure and the production technology of the body of a gun be the key that guarantees perforating quality and job safety.The body of a gun is the carrier of perforator, priming systems such as perforating bullet is transported to hundreds of～dark down-hole of thousands of rice by it, just can finish perforating job.It must have very high sealing, critical external compressive resistance, the capability of antidetonance.Otherwise will cause accidents such as flattening, mistake are penetrated, fried rifle, Ka Jing, the well that falls.For this reason, perforation industry in 1999 is made stipulations: the essential seamless alloy pipe with the 32CrMo4 material of the body of a gun commonly used.But what the seamless alloy pipe of 32CrMo4 was per ton at present arrives the price at factory up to ten thousand yuan.With the 102 the most frequently used body of a guies is example, and 250 yuan nearby of the fee of materials of every meter finished product rifle have accounted for nearly 60% of perforating gun (comprising the body of a gun, firing mount, positioning disk, small arms accessary) sale price.Behind the perforation, perforating gun just puts forward in the well to sell when scrap iron and steel with 1700 yuan per ton, for this seamless alloy pipe of 32CrMo4, uses and once just scraps, no matter from material or all be very big waste from cost.

Three, summary of the invention:

Purpose of the present invention is exactly the above-mentioned defective that exists at prior art, provide a kind of can be with the perforating gun repair process of body of a gun reparation and recycling.

Its technical scheme is: comprise dirt cleaning in the rifle, bore pre-hole, soldering shell hole, repair screw thread, boring inner chamber, pressure testing, drilling blind hole, repair outer surface, pressure testing and painting process again.

More detailed processing step is as follows:

(1), broken firing mount, positioning disk, shell case etc. can block very tightly in the body of a gun behind the perforation, by jarring and draw outward with its taking-up;

(2), to bore pre-hole be earlier the burr of shell hole periphery on the body of a gun to be removed, and gets out a taper hole then;

(3), the soldering shell hole is at first to select the welding rod close with body of a gun material for use, to heat-treat welding rod to the body of a gun before the weldering and will be placed on high-temperature baking maintenance welding rod drying in the baking box, during welding earlier with gas welding to the shell hole preliminary treatment of heating, when the shell hole temperature reaches the directly big capacity continuous welding of 380-420 degree, all will control environment temperature and insulation of postwelding allows the body of a gun cool off naturally;

(4), repair screw thread, tend to be damaged with the screw thread and the sealing surface at its two ends of the body of a gun of crossing, take to amplify a little, specification reprocesses;

(5), the boring inner chamber, the body of a gun clipped on the lathe the interior burr of shell hole and inner chamber crushed element removed with borer;

(6), pressure testing, every rifle is wanted twice of pressure testing at least in repair process;

(7), to repair outer surface be to fill and lead up recess, ties jut with hand grinding tool;

(8), pressure testing again, beat blind hole, spray paint after, body of a gun reparation can be finished.

The invention has the beneficial effects as follows: the one, need not use main equipment though technology is complicated, do not consume a large amount of equipment; The 2nd, to repair itself material of the body of a gun and do not become, the capability of antidetonance can not change yet, and can guarantee that through twice pressure testing its sealing and critical external compressive resistance performance are not less than 60Mpa in the reparation.Be used for the middle-deep well perforation and can guarantee job safety; The 3rd, rehabilitation cost is low, and average every meter reparation body of a gun can be saved 150 yuan of fee of materials, and the sale price of repairing rifle also can reduce more than hundred yuan.The profit margin of repairing rifle is little unlike producing new rifle.The annual perforating gun that consumes in the whole nation is more than 20 myriametres now, and its economic worth of the popularization of this technology is considerable; The 4th, saved the high-quality steel, this technology conforms to environmental requirement, can not pollute environment.

Four, the specific embodiment:

Embodiment, the invention will be further described:

(1), broken firing mount, positioning disk, shell case etc. can block very tightly in the body of a gun behind the perforation, must draw outward with the specific purpose tool jarring tool is taken out; Can not wash by water during cleaning; Curve hook with reinforcing bar, hook firing mount, the body of a gun that strikes with a hammer is then pulled out firing mount;

(2), to bore pre-hole be earlier the burr of shell hole periphery on the body of a gun to be removed (burr is very hard, needs use extraordinary drill bit), gets out the taper hole of a given shape and angle then; Get out 70 degree slopes with Φ 20 drill bits;

(3), the soldering shell hole is the key of this technology, at first to select the 507 welding rods welding rod close for use with body of a gun material, to heat-treat welding rod to the body of a gun before the weldering and will be placed on high-temperature baking maintenance welding rod drying in the baking box, during welding earlier with gas welding to the shell hole preliminary treatment of heating, when the shell hole temperature reaches directly big capacity continuous welding about 400 degree.2 millimeters on the body of a gun is permitted exceeding in the welding rear surface.All will control environment temperature and insulation of postwelding allows the body of a gun cool off naturally.The soldering shell hole requires the operator to have higher solder technology, and pre-job need carry out special training;

(4), pressure testing, because of every rifle is wanted pressure testing twice at least in repair process, so easy and simple to handle, the safe, efficient pressure testing device of two covers will be arranged, and inside and outside pressure can both be tried; The screwed connection of YDSK60Mpa hydraulic test pump adds sealing ring and the body of a gun links up, and injects water pressure was got to the 40Mpa pressurize 30 minutes.If any leaking, rush down and press the back to handle, then in welding with abrasive machine polishing leakage area.So pressure testing is not till leaking.

(5), tend to be damaged, it is very big to repair difficulty on former specification, size, and this technology is taked suitably to amplify, specification is reprocessed, and it is perfectly safe to guarantee to seal with the screw thread and the sealing surface at its two ends of the body of a gun of crossing.But, repair that rifle must adapted be amplified, gun joint, gun breech and the rifle head of specification;

(6), the boring inner chamber is for guaranteeing that firing mount can normally pack into and pull out, the body of a gun being clipped on the lathe with borer the interior burr of shell hole and inner chamber crushed element are removed;

(7), to repair outer surface be to fill and lead up recess with extraordinary putty, tie jut with hand grinding tool and be beneficial to down well operations;

(8), pressure testing again, beat blind hole, spray paint after, body of a gun reparation can be finished, mixing firing mount assembly, small arms accessary, joint again can be delivered for use.

Claims (2)

1, a kind of perforating gun repair process is characterized in that: comprise dirt cleaning in the rifle, bore pre-hole, soldering shell hole, repair screw thread, boring inner chamber, pressure testing, drilling blind hole, repair outer surface, pressure testing and painting process again.

2, perforating gun repair process according to claim 1 is characterized in that: more detailed processing step is as follows:

(1), broken firing mount, positioning disk, shell case etc. can block very tightly in the body of a gun behind the perforation, by jarring and draw outward with its taking-up;

(2), to bore pre-hole be earlier the burr of shell hole periphery on the body of a gun to be removed, and gets out a taper hole then;

(3), the soldering shell hole is at first to select the welding rod close with body of a gun material for use, to heat-treat welding rod to the body of a gun before the weldering and will be placed on high-temperature baking maintenance welding rod drying in the baking box, during welding earlier with gas welding to the shell hole preliminary treatment of heating, when the shell hole temperature reaches the directly big capacity continuous welding of 380-420 degree, all will control environment temperature and insulation of postwelding allows the body of a gun cool off naturally;

(4), repair screw thread, tend to be damaged with the screw thread and the sealing surface at its two ends of the body of a gun of crossing, take to amplify a little, specification reprocesses;

(5), the boring inner chamber, the body of a gun clipped on the lathe the interior burr of shell hole and inner chamber crushed element removed with borer;

(6), pressure testing, every rifle is wanted twice of pressure testing at least in repair process;

(7), to repair outer surface be to fill and lead up recess, ties jut with hand grinding tool;

(8), pressure testing again, beat blind hole, spray paint after, body of a gun reparation can be finished.