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Preparation method of controllable long-acting slow-release scale inhibitor capsule

The technology of scale inhibitor and capsule is applied in the field of preparation of controllable long-acting slow-release scale inhibitor capsule to achieve the effect of prolonging the protective effect.

Inactive Publication Date: 2019-08-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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At present, there is no such patented technology in China

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  • Preparation method of controllable long-acting slow-release scale inhibitor capsule
  • Preparation method of controllable long-acting slow-release scale inhibitor capsule

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A method for preparing a controllable long-acting slow-release scale inhibitor capsule includes the following steps:

[0041] Step 1: Load scale inhibitor

[0042] Load the scale inhibitor solution with a weight percentage concentration of 30-50% and the carrier in a weight ratio of 1:1 to 1:2 under vacuum and negative pressure;

[0043] Step 2: Kneading and drying

[0044] Transfer the scale inhibitor loaded in step 2 to the kneader for kneading for 25 to 35 minutes, and vacuum dry the loaded sample after the treatment;

[0045] Step 3: Prepare the carboxymethyl cellulose solution

[0046] Disperse carboxymethyl cellulose with a concentration of 10% by weight in water and heat to 75-85°C for 50-70 minutes to form a uniform and viscous solution;

[0047] Step 4: Evenly mix the polymer and the loaded sample

[0048] Weigh the loaded sample processed in step 2 and the carboxymethyl cellulose solution prepared in step 3 in a mass ratio of 7:3-9:1, and knead it in a kneader for 20-40 mi...

Embodiment 2

[0060] A method for preparing a controllable and long-acting slow-release scale inhibitor capsule is different from the first embodiment in that the scale inhibitor in the first step is an organic phosphine scale inhibitor.

[0061] Preferably, the organic phosphorus scale inhibitor is amino trimethylene phosphonate, ethylene diamine tetramethylene phosphonic acid, hydroxy ethylidene diphosphonate, 12-phosphonic acid butane-1,2,4-tri Carboxylic, 2-hydroxyphosphonoacetic acid, hexamethylenediamine tetramethylene phosphonic acid or hydrolyzed polymaleic anhydride.

[0062] In actual use, organic phosphine scale inhibitors not only have better resistance to formation water with high salinity, but also have multiple -COOH and -OH, which are used in combination with inorganic tubular fillers such as natural halloysite nanotubes, porous Zeolite etc. are fully assembled.

Embodiment 3

[0064] A method for preparing controllable and long-acting slow-release scale inhibitor capsules, which is different from Example 1 in that the diameter of the granular capsules in step 5 is 1 to 5 mm; the extrusion granulator used is Polymer extrusion granulator.

[0065] In actual use, the diameter of the granular capsule is chosen to match the annular gap as much as possible. The main reason is that the one-side spacing of the oil sleeve annulus is generally more than 25mm; at the same time, when tools are provided outside the tubing, the annulus gap is generally more than 7mm. At this time, the diameter of the granular capsule is less than 1 / 2 of 7mm, that is, 1~3mm is best.

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Abstract

The invention belongs to the technical field of oilfield chemistry, and in particular relates to a preparation method of a controllable long-acting slow-release scale inhibitor capsule. According to the eight steps of loading a scale inhibitor, performing kneading and drying, preparing a carboxymethyl cellulose solution, uniformly mixing a polymer and a loaded sample, preparing a capsule, preparing a polyvinyl alcohol dispersion, coating a shell layer on the outer wall of the capsule, and performing drying, the scale inhibitor and an inorganic nano carrier which is one of the slow-release components are assembled into a homogeneous whole body in the form of a solid solution, and the outside is coated with a controllable soluble crosslinking polymer. When the polymer dissolves in an environmental medium, an active substance is gradually released. By the dual release control mechanism of the polymer dissolution and the scale inhibitor desorption from the inorganic nano carrier, the controllable slow release of the scale inhibitor in a wellbore is achieved, and thus the protective effect on the wellbore is prolonged.

Description

Technical field [0001] The invention belongs to the technical field of oil field chemistry, and in particular relates to a preparation method of a controllable long-acting slow-release scale inhibitor capsule. Background technique [0002] Scaling is an important problem that affects oilfield development. Scaling occurs in the entire life cycle of an oil well, and there may be typical problems of scaling in the entire system of injection, production, and flooding. [0003] The traditional method to solve the problem of scaling is to inject liquid scale inhibitors directly from the wellhead of the oil well into the well, but these scale inhibitors quickly flow away with the produced fluid or adhere to the pipe wall and cannot all reach the bottom of the well. , It needs continuous and frequent filling, which brings many troubles to production and management. At present, the most studied solid slow-release scale inhibitor is the matrix tablet slow-release scale inhibitor, that is, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/536
CPCC09K8/536
Inventor 李琼玮杨立华刘爱华郭钢王光义姜毅李慧戚建晶何淼董俊
Owner PETROCHINA CO LTD
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