CN101275464A - Oil gas well completion temporary blocking liner tube - Google Patents

Abstract

The invention relates to an oil and gas well completion temporary plugging lining pipe, which is used for the under-balanced well completion after under-balanced drilling, belonging to the field of whole process under-balanced drilling well completion snubbing manufacturing technology. Based on the characteristic that temporary plugging agent can melt under high temperature, the invention designs an oil and gas well completion temporary plugging lining pipe which has an upper joint and a lower joint, and is equipped with through sieve pores with temporary plugging agent inside on the pipe body, solves the problem that a tail pipe is perforated in the prior art, resulting in tail pipe deformation, and is in an unfixed state in a well, bringing in trouble to subsequent works, the sieve pores of the temporary plugging lining pipe are processed on the ground, thus the temporary plugging lining pipe has the characteristics of convenient process and deformation improbability, a different binder can be selected in accordance with a different well depth to implement temporary plugging, after the lining pipe is put in the well, the temporary plugging agent can melt slowly when the temperature in the well reaches to a preset value, thus a temporary lining pipe having sieve pores can be obtained.

Description

Oil gas well completion temporary blocking liner tube

Technical field:

A kind of oil gas well completion temporary blocking liner tube is used for underbalance and creeps into later under balance pressure drilling completion, belongs to the designing and manufacturing technique technical field of overall process under-balance drilling completion tubular string.

Background technology:

At present, technology such as the underbalance in the overall process under-balance drilling technology is crept into, not kill-job band is pressed and made a trip, underbalance is got core, not kill-job band is pressed well logging have all reached its maturity, but the insufficient balance well completion mode is also more single, main completion mode is barefoot completion and liner completion, the mode of barefoot completion has fast and the advantage of saving, but its shortcoming is: only just can implement in the harder layer position of subsurface rock, can cause the borehole wall to collapse on softer stratum and scall enforcement barefoot completion, and finally cause well unavailable; Adopting tail pipe completion under the condition of not cementing the well is mode commonly used at present, but need implement perforation to the tail pipe of G.I.H, making it become petroleum resources that bushing pipe with holes just can make the down-hole enters oil pipe and is adopted ground, but because the impact of perforation is bigger, the tail pipe distortion is big behind the perforation, and because tail pipe not well cementation in well, be in unfixed state, not placed in the middle in well, the pin of the unidirectional level pressure joint of the oil pipe that is lowered to after can causing like this blocks at the tail pipe of cutting off the fried distortion of back valve core quilt can not fall into the shaft bottom, bring trouble to follow-up work, number of patent application is that 200520113354.3 patent application discloses a completion system that insufficient balance well completion is used, this patent is that nonpenetrating bar shaped axial groove is cut in segmentation in advance on pipe, by expander nonpenetrating bar shaped axial groove is expanded again after these are cut the pipe G.I.H of bar-shaped trough, become the screen casing that penetrates, play the effect of blocking down-hole silt, but, in actual applications, this Technology Need is lowered to hanger earlier, and hanger and bobbin seal combined, because the coupling part of sleeve pipe and hanger exists circularity form and position tolerance and dimensional tolerance, be difficult to seal and put in place, and therefore cause hanger to hang failure, hanger is provided with failure and will be directed at and has the non-pipe that penetrates the bar shaped axial groove and can't be suspended in the well, in the process of test, there is the hanger setting to finish accidentally, but when being lowered to expander and outwarding winding nonpenetrating bar shaped axial groove, because expander brings higher temperature with the friction of pipe string, make the rod axle of expander cause adhesion with the pipe string, can't in well, drilling tool be proposed, finally cause well to be scrapped, in addition, the non-bar shaped axial groove that penetrates that cuts can make the intensity of pipe string descend greatly, will be out of shape when running into hole anomaly.

Summary of the invention:

The objective of the invention is at prior art problems, the characteristics of utilizing diverting agent under higher temperature, to melt voluntarily, design a kind of sieve aperture of on pipe, offering, and stop up, in well, melt the oil gas well completion temporary blocking liner tube of de-plugging then under the high temperature voluntarily by diverting agent.

The present invention is achieved in that and the present invention includes body and joint, be provided with top connection and lower contact at the two ends of body, have round sieve on body, sieve aperture is by the diverting agent shutoff, specific implementation method is, earlier offer sieve aperture on the body circumference, make it become bushing pipe, the sieve diameter on the bushing pipe inwall is little, sieve diameter on the outer wall is big, then, sieve aperture is blocked by bonding agent, and dry solidification; During use, need to determine the pipe string of length at the scene as required, on the pipe string, get out the hole of needs quantity then according to the size of tolerance, owing to be to implement the underbalance band to depress into the pipe string, need in the process that is lowered to the pipe string, stop crude oil or natural gas in the well to enter in the pipe by sieve aperture, so diverting agent is injected the good hole of brill, and make its drying, so just make the bushing pipe that hole-drilled screen casing becomes does not have the hole, reach the purpose that is lowered to the pipe string under the situation of pressure having, lower end with ready-made oil gas well completion temporary blocking liner tube connects guide shoe then, top connection jointed rod, and G.I.H are after arriving predetermined well depth, the temperature of down-hole can connect being stained with on the temporary blocking liner tube agent melts, and so just can implement the production of oil gas without perforation.

The invention has the beneficial effects as follows: the sieve aperture of temporary blocking liner tube is processed on ground, has processing conditions preferably, also can not cause the distortion of temporary blocking liner tube, the hole of being bored simultaneously is less, substantially can not influence the intensity of pipe string, because being different being stained with of different choice according to well depth, the diverting agent that uses connects agent as the sieve aperture on the diverting agent shutoff temporary blocking liner tube, therefore after the desired depth of G.I.H, diverting agent can slowly melt under certain downhole temperature, reach the purpose that becomes the temporary blocking liner tube that has sieve aperture, owing to reduced perforation, temporary blocking liner tube can not be out of shape, a bite well just can be saved the perforation cost about 1,000,000 yuan, can also accelerate the paces of oil-gas mining.

Description of drawings:

Fig. 1 is the temporary blocking liner tube generalized section in the hole of plugging temporarily.

The specific embodiment:

Provide embodiments of the invention below in conjunction with accompanying drawing: the present invention includes body 2 and joint, the two ends of body are provided with top connection 1 and lower contact 5, on the circumference of body 2, have the conical sieve aperture 3 of 8-10mm, the conical sieve aperture 3 that connects body 2 is taper, the diameter of diameter＜tube wall one face of inboard wall of tube body one face, conical sieve aperture 3 is inside and outside perforation on body 2, be marked with diverting agent 4 shutoff in the conical sieve aperture 3, the pressure that the diverting agent of the conical sieve aperture 3 of shutoff bears is≤10MPa, fusion temperature＞80 ℃; Specific implementation method is: pipe string that need to determine length at the scene as required, size according to tolerance gets out the inside and outside tapered sieve aperture 3 that connects on the body 2 of ordinary casing then, so just made the screen casing that has sieve aperture 3, because depressing the pipe string, enforcement underbalance band need in the process that is lowered to the pipe string, stop crude oil or natural gas in the well enter in the pipe by sieve aperture, after so screen casing is made, use the well depth of well according to screen casing, the bonding agent that selection is adapted at dissolving under the uniform temperature environment injects brill as diverting agent 4, and good hole blocks sieve aperture 3, and make diverting agent 4 dry solidifications, can play sealing after diverting agent 4 is dry and bear≤pressure of 10MPa, like this, hole-drilled screen casing just becomes the bushing pipe that does not have the hole, can reach the purpose that is lowered to the pipe string under the situation of pressure having; In use, the oil gas well completion temporary blocking liner tube lower contact 5 of next root connects guide shoes, top connection 1 connects a last temporary blocking liner tube, after having connected the temporary blocking liner tube that all needs length, top connection 1 jointed rod of a temporary blocking liner tube topmost, and be lowered to the degree of depth that needs, in the process that in well, is lowered to, fashionable under beginning, because well temperature is lower than fusion temperature, temporary blocking liner tube keeps good sealing, and natural gas in the well or crude oil can not enter in the pipe string, when temporary blocking liner tube arrives predetermined well depth, after temperature reached predetermined value, diverting agent began to dissolve automatically, and the diverting agent on the temporary blocking liner tube 4 is all melted slowly, make originally by stifled and the pipe of non-mesh becomes the screen casing that has sieve aperture 3 temporarily, giving up then trips out drilling tool, therefore just can finish the operation of bushing pipe under the not kill-job under the insufficient balance condition without perforation, when if diverting agent can not melt arriving predetermined well depth, can in well, inject high-temperature steam and impel the diverting agent thawing and become screen casing.

Claims (3)

1. an oil gas well completion temporary blocking liner tube comprises body and joint, it is characterized in that: have the round taper hole of 8-10mm on the described body circumference, round taper hole is inside and outside perforation on body, is marked with the diverting agent shutoff in conical hole.

2. oil gas well completion temporary blocking liner tube according to claim 1 is characterized in that: the pressure that described diverting agent bears is≤10MPa; The fusion temperature of diverting agent＞80 ℃.

3. oil gas well completion temporary blocking liner tube according to claim 1 is characterized in that: described round taper hole is at the diameter of the diameter＜tube wall one side of inboard wall of tube body one side.

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