CN-121993117-A - Sand control screen string, sand control method and special tool

CN121993117ACN 121993117 ACN121993117 ACN 121993117ACN-121993117-A

Abstract

The invention discloses a sand control screen string, a sand control method and a special tool, wherein the sand control screen string comprises a screen pipe and a centralizer which are connected, the screen pipe comprises an insoluble inner pipe, and a soluble outer pipe is fixedly sleeved outside the insoluble inner pipe; the centralizer comprises a soluble inner ring, wherein the inner ring is fixedly sleeved in a supporting ring, the supporting ring is made of insoluble materials, and the centralizer is sleeved on the insoluble inner pipe. The sand control device can effectively support the well wall during sand control operation, and after the operation is finished, the insoluble part can be taken out to form a mechanical pipe column-free well, so that the problem that the post-treatment operation of an oil well, especially a slim hole well, is difficult is solved. A sand control method, after the chemical extrusion circulation sand control is carried out by the serial matching of part of soluble sand control screen pipes, a complete and uniform chemical sand blocking barrier can be formed without drilling and plugging, and the chemical sand control effect is improved.

Inventors

CHEN GANG
WEI QINGCAI
LI JIANDA
JIA PEIFENG
GAO XUEFENG
WEI TAO
HAN HONG

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司胜利油田分公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (10)

1. The sand control screen string comprises a screen pipe and a centralizer which are connected, and is characterized in that the screen pipe comprises an insoluble inner pipe, and a soluble outer pipe is fixedly sleeved outside the insoluble inner pipe; the centralizer comprises a soluble inner ring, wherein the inner ring is fixedly sleeved in a supporting ring, the supporting ring is made of insoluble materials, and the centralizer is sleeved on the insoluble inner pipe.
2. The sand control screen string as recited in claim 1 wherein an upper joint is provided at an upper end of the inner insoluble tube and a lower joint is provided at a lower end of the inner insoluble tube; the inner ring inner diameter is larger than the outer diameter of the insoluble inner pipe, and the inner ring inner diameter is smaller than the outer diameter of the soluble outer pipe; the upper joint of the lower sieve tube is connected with the lower joint of the upper sieve tube between the two sieve tubes, the centralizer is slidably sleeved on the outer wall of the joint of the two sieve tubes, and the soluble outer tubes of the two sieve tubes play a limiting role on the centralizer.
3. The partially soluble support sand blocking screen dedicated to a sand control screen string of claim 2 wherein the soluble outer tube is provided with outer slots and the insoluble inner tube is provided with inner slots.
4. The partly soluble support sand blocking screen special for a sand control screen string according to claim 3, wherein an assembly groove is formed in the outer wall of the insoluble inner tube above the inner cutting seam, a spline ring corresponding to the assembly groove is arranged on the inner wall of the upper end of the insoluble inner tube, and the assembly groove is in interference fit with the spline ring.
5. The sand control screen string as recited in claim 2 wherein the soluble outer tube is divided into two sections, the sections of the soluble outer tube being provided with compensators; the compensating piece is made of rubber materials, the compensating piece is of a spiral rubber ring structure, and two ends of the compensating piece are connected with the two sections of soluble outer tubes in a jogged mode; The inner walls of the two ends of the section of the soluble outer tube are provided with L-shaped embedded ring grooves, the two ends of the compensation piece are provided with L-shaped embedded ring blocks, and after the L-shaped embedded ring grooves are clamped with the L-shaped embedded ring blocks, the compensation piece is tightly attached to the insoluble inner tube.
6. The sand control screen string as recited in claim 2 wherein the support ring comprises an outer ring and support claws, the inner ring is fixedly sleeved in the outer ring, the support claws are arranged at the outer wall of the outer ring and are uniformly distributed along the circumferential direction of the outer ring, and a flow passage is arranged between every two support claws.
7. The sand control screen string of claim 6 wherein the support legs and outer ring are made of an insoluble drillable elastomeric material.
8. A sand prevention method is characterized in that, the sand control screen string of claim 6 comprising the steps of: S1, determining the number of sieve tubes and centralizers according to well conditions of a sand control target well, combining sand control tube strings, and connecting the sand control tubes in series with a sand control tube column; s2, lowering the sand control pipe column to a design position; S3, performing chemical extrusion circulation filling construction according to design requirements, wherein the soluble outer tube and the supporting claw play a supporting role; S4, closing the well and waiting for condensation; S5, dissolving the soluble outer tube of the sieve tube and the inner ring of the centralizer according to the dissolution condition of the material, wherein the insoluble inner tube can be directly lifted out at the moment, the supporting claw and the propping agent are fixedly connected to support the well wall, and the outer ring can also protect the insoluble inner tube and prevent the insoluble inner tube from colliding with the well wall; S6, pulling out the sand control pipe column.
9. The special part soluble support sand blocking screen pipe for the sand control screen pipe string comprises an inner pipe and is characterized by further comprising an outer pipe, wherein the outer pipe is fixedly sleeved on the outer wall of the inner pipe, the inner pipe is an insoluble inner pipe, and the outer pipe is a soluble outer pipe.
10. The inner ring and the outer ring elastic centralizer are characterized by further comprising an inner ring, the inner ring is fixedly sleeved in the supporting ring, the inner ring is made of a soluble material, and the supporting ring is made of an insoluble material.

Description

Sand control screen string, sand control method and special tool Technical Field The invention relates to the technical field of sand prevention of petroleum, in particular to a sand prevention screen string, a sand prevention method and a special tool. Background At present, the sand-yielding oil field of the victory oil field has large proportion and wide distribution, and the reserves and annual output of the victory oil field are about 80 percent. The sand control technology is used as a basic technology for the development of loose sandstone oil reservoirs, and plays a key role in continuous stable production of oil fields. The loose sandstone oil reservoir of the victory oil field, especially the oil reservoir with higher clay content, polymer injection and higher crude oil viscosity, the production of a large amount of fluid gradually increases along with the exploitation of years, the reservoir pressure is reduced, the load of sand bearing sand grains of the reservoir sand body gradually increases, the stress balance among the sand grains is destroyed, the cementing force is reduced, the sand output is serious, the sand prevention mode of extrusion circulation filling or chemical sand prevention is adopted after hanging filtration is adopted, but the problem of low liquid easily occurs due to serious blockage after hanging filtration, the chemical sand prevention is easy to destroy, the effective period is short, and the benefit development of the oil reservoir is unfavorable. At present, the chemical sand prevention also has a process of drilling a plug after the plug is left, but the process of drilling the plug inevitably forms certain extrusion, collision and other damages to the sand blocking barrier, and when the inclination of a borehole is large, a drill bit is difficult to center, so that the sand blocking barrier is uneven along the periphery of the well, and the sand prevention effect is greatly affected. CN104533354a discloses a plug-type sand control method for side drilling of small well, which uses a concretionary chemical sand control propping agent to fill in the well shaft of sand control purpose layer with low pump pressure to form a sand blocking plunger, which can effectively block stratum sand outside the well shaft and prevent the stratum sand from entering the well shaft. The method comprises the steps of lifting a production string, setting down a sand washing string, performing sand washing operation after the sand washing string is set down to a sand surface position, completing sand prevention string, testing pressure of a ground pipeline, filling a shaft, pre-placing liquid, filling shaft plug gravel, displacing liquid, waiting for solidification, drilling plug and retaining plug. The sand control method in the prior art is a mode of filling and then drilling a plug, the drilling plug is not needed in the patent, the damage to the sand blocking barrier in the drilling plug process is overcome, the technical principle and the implementation scheme of the sand blocking barrier are essentially different, and in addition, the patent provides a sieve and a centralizer, and the comparison patent is not related. The utility model discloses a soluble screen pipe and well completion tubular column, this soluble screen pipe includes screen pipe body, soluble hole stopper and sand control spare, the pipe wall of screen pipe body is equipped with the aperture, soluble hole stopper installs in the aperture, soluble hole stopper is used for shutoff aperture, sand control spare is installed in the aperture, sand control spare is used for filtering sand grain, after soluble hole stopper is dissolved by acid liquid, the inside and outside of screen pipe body is switched on through the aperture, because the aperture is equipped with sand control spare, and then can filter sand grain, the sand control ability of reinforcing well completion tubular column reduces the erosion of stratum sand production to well head manifold and ground gathering pipeline. The soluble screen pipe of this prior art is the soluble hole stopper of design, and this patent design is soluble inner ring, and the two is structurally different completely, and in addition, the screen pipe of comparison patent is used for the sand control when producing in the well down, and the screen pipe of this patent is for supporting chemical sand control wall of a well usefulness when being used for chemical sand control, and the insoluble part of screen pipe can take out after the consolidation, forms the wellbore that does not have mechanical tubular column, and the two is different in technical principle. In addition, the sand control method provided by the patent is not related to the comparison patent. The patent discloses a soluble screen pipe and a use method thereof, wherein the soluble screen pipe is provided with overflow channels uniformly formed in the side wall of a screen pipe base pipe, a filling unit is used for pl