CN102435461B

CN102435461B - Method for sampling using decompression sampling joint

Info

Publication number: CN102435461B
Application number: CN201110344539.5A
Authority: CN
Inventors: 窦虎清; 贾芝; 王大权
Original assignee: Changqing Cementing Branch of CNPC Chuanqing Drilling Engineering Co Ltd
Current assignee: Changqing Cementing Branch of CNPC Chuanqing Drilling Engineering Co Ltd
Priority date: 2011-11-04
Filing date: 2011-11-04
Publication date: 2014-08-20
Anticipated expiration: 2031-11-04
Also published as: CN102435461A

Abstract

The invention relates to a joint, and in particular to a decompression sampling joint, which is characterized by comprising a first high-pressure valve, a second high-pressure valve, a tee pipe manifold, a decompression chamber short circuit and a sampling short circuit, wherein two ends of the tee pipe manifold are respectively in union connection with a ground high-pressure pipe manifold; the T-shaped port at the middle of the tee pipe manifold is connected with the first high-pressure valve; and the first high-pressure valve, the decompression chamber short circuit, the second high-pressure valve and the sampling short circuit are sequentially connected. By using the decompression sampling joint provided by the invention, the defects existing in the prior art are overcome, and a grout detection sample can be safely taken out in a high-pressure environment condition, so that the cement density can be effectively adjusted in a construction process.

Description

A kind of method that adopts decompression sampling joint sampling

Technical field

The present invention relates to a kind of joint, particularly a kind of decompression sampling joint.

Background technology

When constructing, passes through under the direct Injection Well of high pressure line because grout configuration is rear physical foam cement, and press in high pressure pipe joint during cementing, be 4-6MPa, because density measure is unique detection means of cementing operation, do not have Density Detection just can not adjust in time cement consistency, fully meet the requirement of cementing design to density, construction quality does not just guarantee yet, therefore under condition of high voltage, in high pressure pipe joint, extracts grout sample, with regard to the problem that has become Density Detection link to solve.And prior art cannot be taken out the grout sample under 4-6Mpa pressure in high pressure pipe joint and detected, therefore need new technology solve this problem.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of decompression sampling joint, to overcome the defect existing in prior art, makes the taking-up grout of safety under hyperbaric environment condition detect sample, to effectively adjust the cement density in work progress.

Technical scheme of the present invention is: a kind of decompression sampling joint, is characterized in that: comprise first high pressure valve, the second high pressure valve, threeway manifold, decompression chamber short circuit and sampling short circuit; Wherein, the two ends of described threeway manifold are connected with ground high pressure pipe joint union respectively, and the T-shaped port in the middle of threeway manifold connects the first high pressure valve, and described the first high pressure valve, decompression chamber short circuit, the second high pressure valve and sampling short circuit are connected successively.

The diameter of described the first high pressure valve, the second high pressure valve, threeway manifold, decompression chamber short circuit and sampling short circuit is 2 inches.

Described decompression chamber short circuit and sampling short circuit are threaded line pipe.

The ground high pressure pipe joint union that described threeway manifold two ends are 2 inches by pipe thread button and diameter is respectively connected, and the T-shaped port in the middle of threeway manifold is connected with the first high pressure valve by pipe thread button.

Technique effect of the present invention is: the present invention make foamed cement slurry samples can be smoothly from high pressure pipe joint the extracting of safety, for detection and data acquisition, guidance and adjusting cement slurry density.

Accompanying drawing explanation

Below in conjunction with embodiment accompanying drawing, the present invention will be further described:

Fig. 1 is schematic diagram of the present invention.

Reference numeral is:

The first high pressure valve, 2. the second high pressure valve, 3. threeway manifold, 4. decompression chamber short circuit, 5. sampling short circuit, 6. grout flows to.

Embodiment

The present invention is applicable to the use of airtight manifold inner high voltage liquid pressure-reducing sampling, has effectively solved a physical foam cementing concrete slurry enclosed sampling difficult problem, has met cement slurry density testing requirement, to cement slurry density adjustment and correction in cementing operation, provides Data support.

Embodiment 1:

Referring to Fig. 1, concrete structure of the present invention is: a kind of decompression sampling joint, comprises first high pressure valve 1, the second high pressure valve 2, threeway manifold 3, decompression chamber short circuit 4 and sampling short circuit 5; Wherein, the two ends of described threeway manifold 3 are connected with ground high pressure pipe joint union respectively, and the T-shaped port in the middle of threeway manifold 3 connects the first high pressure valve 1, and described the first high pressure valve 1, decompression chamber short circuit 4, the second high pressure valve 2 and sampling short circuit 5 are connected successively.The parts that the present embodiment does not describe in detail and structure belong to well-known components and common structure or the conventional means of the industry, here not narration one by one.

Embodiment 2:

On the basis of embodiment 1, the diameter of the first high pressure valve 1 in the present invention, the second high pressure valve 2, threeway manifold 3, decompression chamber short circuit 4 and sampling short circuit 5 can be 2 inches.

Decompression chamber short circuit 4 in the present invention and sampling short circuit 5 can be threaded line pipe.

The ground high pressure pipe joint union that threeway manifold 3 two ends in the present invention can be 2 inches by pipe thread button and diameter is respectively connected, and the T-shaped port in the middle of threeway manifold 3 can be connected with the first high pressure valve 1 by pipe thread button.

Specifically:

1, threeway manifold 3 both ends in the present invention are connected with ground high pressure pipe joint union with pipe thread button, the T-shaped port of threeway manifold 3 links the inlet end that connects the first high pressure valve 1 by pipe thread, the endpiece of the first high pressure valve 1 connects the inlet end of decompression chamber short circuit 4, the endpiece of decompression chamber short circuit 4 connects the inlet end of the second high pressure valve 2, and the endpiece of the second high pressure valve 2 connects sampling short circuit 5 again.

2, the major function of the first high pressure valve 1 and the second high pressure valve 2 is:

Control Highpressure Tee manifold 3 interior band compressed water slurries and enter decompression chamber short circuit 4, close after the first high pressure valve 1, enter decompression chamber short circuit 4 grout because being mixed with decompression chamber air, and because of the compressible volume of air large, therefore pressure obviously reduces, while opening the second high pressure valve 2, through the post-decompression grout of decompression chamber short circuit 4, steadily flow out sampling short circuit 5, complete sampling operation.

3, the major function of decompression chamber short circuit 4 is:

The grout that storage enters from the first high pressure valve 1, the liquid storage space of decompression chamber short circuit 4 determined by liquid storage pipe length, and the concrete liquid storage desirable 500-700ml in space, is preferably 500ml liquid storage space, liquid storage space to be preserved is the free stagnation of the circulation of vital energy chamber of leaving a blank, and with the sample size that guarantees to obtain, meets measurement demand.

4, the present invention is by the extracting in Highpressure Tee manifold 3 of the foam slurry safety under 4-6MPa pressure, to detection sample is provided.The principle of the invention is to adopt two stage pressure reducing method, first opens the first high pressure valve 1 and by threeway manifold 3, injects decompression chamber short circuit 4 by flow to the mobile water under high pressure mud of 6 directions along grout; Then close the first high pressure valve 1, the grout pressure that now enters decompression chamber short circuit 4 has obtained the normal pressure value that decompression reaches fluid in air, and after opening the second high pressure valve 2, grout collects in sampling appliance by sampling short circuit 5 stably.

While 5, sampling, must first close rear first high pressure valve 1 of just opening of the second high pressure valve 2, then after first closing high pressure valve 1, open again the second high pressure valve 2, two valves are alternation switch mutually, the ejection at a high speed of the interior band compressed water slurry of no side threeway manifold 3, the finished product material heavy losses that cause constructing, pollution well site environment or injury site operation personnel.

The present invention adopts two stage pressure reducing principle that foamed cement slurry samples can be extracted smoothly from high pressure pipe joint, and its sampling process is as follows:

1, first by sample connection by having assembled described in step 1 on rear connection and ground high pressure pipe joint, close two high pressure valves that three go sides connect.

2, construction starts rear foam slurry and injects into well by threeway manifold along ground high pressure pipe joint.During sampling, first open decompression sampling joint upper end high pressure valve, now manifold inner foam grout flows into 2 ^〃in short circuit (decompression chamber), then close decompression sampling joint upper end high pressure valve, open decompression sampling joint lower end high pressure valve, flow into 2 ^〃foamed cement slurry samples in short circuit flows into sample bucket from valve export sampling short circuit, can carry out sample rate detection.

While 3, again sampling, first close lower end high pressure valve, then open upper end high pressure valve, repeating step 3 processes can complete.Whole sampling process must be followed two high pressure valve alternation switch steps, forbids two high pressure valves in while open mode, otherwise in high pressure pipe joint, grout can be along threeway sampling nozzle high velocity jet out.

Claims

1. a method that adopts decompression sampling joint to sample, described decompression sampling joint comprises first high pressure valve (1), the second high pressure valve (2), threeway manifold (3), decompression chamber short circuit (4) and sampling short circuit (5); Wherein, described the first high pressure valve (1), decompression chamber short circuit (4), the second high pressure valve (2) and sampling short circuit (5) are connected successively; The diameter of described the first high pressure valve (1), the second high pressure valve (2), threeway manifold (3), decompression chamber short circuit (4) and sampling short circuit (5) is 2 inches; Described decompression chamber short circuit (4) and sampling short circuit (5) are threaded line pipe; The ground high pressure pipe joint union that described threeway manifold (3) two ends are 2 inches by pipe thread button and diameter is respectively connected, and the T-shaped port in the middle of threeway manifold (3) is connected with the first high pressure valve (1) by pipe thread button;

Adopt the sampling process of this decompression sampling joint as follows:

1) after, first decompression sampling joint having been assembled, be connected on the high pressure pipe joint of ground, close the first high pressure valve (1) and the second high pressure valve (2) that are connected with threeway manifold (3);

2), construction starts rear foam slurry and injects into well by threeway manifold (3) along ground high pressure pipe joint; During sampling, first open the first high pressure valve (1) on decompression sampling joint, now threeway manifold (3) foam slurry flows in decompression chamber short circuit (4), then close the first high pressure valve (1), open the second high pressure valve (2), the foamed cement slurry samples flowing in decompression chamber short circuit (4) flows into sample bucket from the sampling short circuit (5) in the second high pressure valve (2) exit, can carry out sample rate detection;

3), while again sampling, first close the second high pressure valve (2), then open the first high pressure valve (1), repeating step 2) can complete.