CN1858147A

CN1858147A - Oil well sand washing plugging agent and plugging method

Info

Publication number: CN1858147A
Application number: CN 200610042327
Authority: CN
Inventors: 盖海防; 盖天雕
Original assignee: DONGYING SUNCOO PETROLEUM Co Ltd
Current assignee: DONGYING SUNCOO PETROLEUM Co Ltd
Priority date: 2006-01-26
Filing date: 2006-01-26
Publication date: 2006-11-08

Abstract

The oil well sand washing and plugging agent is re-compounded with component A of polymer and component B of cross-linking agent. The first recipe includes component A comprising guar gum powder, hydroxyl propyl guar gum powder, tonka bean gum powder, sesbania powder, hydroxyl propyl-hydroxyl methyl sesbania powder or hydroxyl propyl sesbania powder 10-70%, expansion preventing agent 0-10%, emulsifier 0.5-10% and industrial oil 20-60%; and component B comprising organoboron 30-70% and biological enzyme 10-60%. The second recipe includes component A of polyacrylamide latex 30-90% and component B of organoboron 10-70%. The present invention is used for oil well sand washing and plugging, and has simple construction, good operability, and high plugging effect.

Description

Oil well sand washing plugging agent and blocking method

One, technical field

The present invention relates to the sand washing technology in a kind of oil-field development, specifically a kind of oil well sand washing plugging agent and blocking method.

Two, background technology

Latter period of oilfield development has been arrived in present most of oil field, and oil well is except that moisture height, and sand production is also relatively more serious, and the serious well that shakes out is often buried the shaft bottom oil-yielding stratum, makes the oil reservoir crude oil can not extraction.To use this moment cementing truck to play the transport fluid sand washing, sand is flushed to ground in sleeve pipe, solve sand and bury oil reservoir, influence the problem of oil well output toward tubing string.In the sand washing process, when fluid column pressure is higher than sand pressure in the pit shaft of oil reservoir position, can cause workover fluid leakage in various degree, have a strong impact on the normal procedure of workover treatment, both wasted sand cleaning fluid, brought infringement to oil reservoir again.Particularly at the scene during the sand washing of operation well-flushing, can occur leakage phenomena at any time,, can result in hand cramps to operation if can not take leaking-stopping measure quickly and efficiently.Thereby employing leak stopping shield technology is a kind of effective ways in the workover treatment process.

Temporarily stifled sand washing medicament in the market mainly is technical products such as polymer gel, jello, oil-soluble resin particle.We find in using at the scene, use the oil-soluble resin particle separately, and when the leakage situation was serious, measure was very ineffective.Use gel and frozen glue thing in process for preparation because the conventional polymer dissolving is slow, generally need just can be ready to for a long time, and need carry out at preparation station, add problems such as transportation, when going wrong, the scene generally can not solve rapidly, make flow chart have to stop, influence operating efficiency.

Three, summary of the invention

The purpose of this invention is to provide a kind of oil well sand washing plugging agent and blocking method, solve above-mentioned the deficiencies in the prior art.

Technical scheme of the present invention realizes in the following manner:

Oil well sand washing plugging agent of the present invention is by A agent polymkeric substance and the B crosslinker agent is composite forms.

First kind of prescription is: A agent+B agent=melon glue powder or hydroxypropylguar gum or tonka-bean rubber powder or sesbania powder or hydroxypropyl one methylol sesbania powder or hydroxypropyl an aromatic plant metioned in ancient books cyanines powder: expansion-resisting agent: emulsifying agent: industry oil+organic boron: biological enzyme=10～70%: 0～10%: 0.5～10%: 20～60%+30～70%: 10～60%

Second kind of prescription is: A agent+B agent=latex polyacrylamide+organic boron=30～90%+70～10%; The latex polyacrylamide is anionic or cationic or non-ionic type, has divided amount all between 300-2000 ten thousand.

Blocking method of the present invention is: the ratio of A agent 0.1t～0.8t+B agent 0.1t～0.8t clear water is mixed at the scene, earlier 0.1t～0.8t polymkeric substance and 10t clear water being mixed stirs adds 0.1t～0.8t linking agent and stirs, stir into frozen glue liquid, near squeezing into the well-cased perforating eye with cementing truck from oil pipe or sleeve pipe, form the low shield ring of rate of permeation, sand cleaning fluid is not missed to oil reservoir, the sand that sand is buried oil reservoir tubing string section is flushed to ground, and the tubing string sand that solves oil layer section buries, the problem of sand washing leakage.

Compared with the prior art the present invention has the following advantages:

1, can on-the-spotly prepare fast, dissolving adapts to the timely needs of on-the-spot discovery sand washing leakage construction rapidly after the polymkeric substance special processing;

2, superior performance is carried frozen glue and grit in the pit shaft effectively can be carried out fast, and ability is strong, reaches the purpose of quick sand washing;

3, easy and simple to handle, the efficient height, the success ratio height, on-the-spot operability is good;

4, plugging agent forms the frozen glue sleeve pipe at the sand string perforation interval, makes towards liquid and does not enter the stratum, has protected oil reservoir.

Four, description of drawings

No accompanying drawing.

Five, embodiment

For further disclosing technical scheme of the present invention, elaborate below by embodiment:

Oil well sand washing plugging agent of the present invention is by A agent-polymkeric substance and B agent-linking agent is composite forms, and its compounded formula has two kinds: first kind of prescription is A agent+B agent=melon glue powder or hydroxypropyl an aromatic plant metioned in ancient books guar gum or tonka-bean rubber powder or sesbania gum powder or hydroxypropyl-methylol sesbania powder or hydroxypropyl an aromatic plant metioned in ancient books sesbania powder: expansion-resisting agent: emulsifying agent: industry oil+organic boron: biological enzyme=10～70%: 0～10%: 0.5～10%: 20～60%+30～70%: 10～60%; Wherein melon glue powder is a plant gum powder; Expansion-resisting agent is KCL.NH ₄The CL cationic polymers; Industry oil is white oil or diesel oil or kerosene.

Second kind of prescription is: A agent+B agent=latex polyacrylamide+organic boron=30～90%+70～10%

Wherein the latex polyacrylamide is anionic or cationic or non-ionic type, molecular weight is all between 300-2000 ten thousand, be all A agent 0.1t～0.8t and B agent 0.1t～0.8t and clear water 10t to be mixed when the oil well sand washing leak stopping with first kind of prescription or second kind of prescription, earlier 0.1t～0.8t agent and 10t clear water being mixed when being mixed stirs adds 0.1t～0.8t agent and stirs, stir into frozen glue liquid, near squeezing into the well-cased perforating eye with cementing truck from sleeve pipe, form the low shield ring of rate of permeation, sand cleaning fluid is not missed to oil reservoir, the sand that sand is buried the oil reservoir tubing string is flushed to ground, solves oil well and is buried by sand, the problem of sand washing leakage.

With the sand cleaning fluid sand washing time, exceptional well such as first pressure that circulate not rise illustrates that plugging effect is not obvious, can add a certain amount of oil-soluble resin as one sees fit, injects the sand cleaning fluid sand washing again, forbids to use with formaldehyde and other linking agent or viscosifying agent.

In the sand washing process, plugging agent is taken sand to ground, and most of colloid is flushed to ground with sand cleaning fluid, and sand has been dashed, and plugging agent also remains little, and Special Circumstances utilize counter the clearing of elimination frozen glue enzyme treatment technique to remove again.

Claims

1, a kind of oil well sand washing plugging agent is by A agent polymkeric substance with the B crosslinker agent is composite forms; First kind of prescription is: A agent+B agent=melon glue powder or hydroxypropylguar gum or tonka-bean rubber powder or sesbania powder or hydroxypropyl one methylol sesbania powder or hydroxypropyl an aromatic plant metioned in ancient books cyanines powder: expansion-resisting agent: emulsifying agent: industry oil+organic boron: biological enzyme=10～70%: 0～10%: 0.5～10%: 20～60%+30～70%: 10～60%; Second kind of prescription is: A agent+B agent=latex polyacrylamide+organic boron=30～90%+70～10%; The latex polyacrylamide is anionic or cationic or non-ionic type, has divided amount all between 300-2000 ten thousand.

2, a kind of blocking method, the ratio of A agent 0.1t～0.8t+B agent 0.1t～0.8t clear water is mixed at the scene, earlier 0.1t～0.8t polymkeric substance and 10t clear water being mixed stirs adds 0.1t～0.8t linking agent and stirs, stir into frozen glue liquid, near squeezing into the well-cased perforating eye with cementing truck from oil pipe or sleeve pipe, form the low shield ring of rate of permeation, sand cleaning fluid is not missed to oil reservoir, the sand that sand is buried oil reservoir tubing string section is flushed to ground, and the tubing string sand that solves oil layer section buries, the problem of sand washing leakage.