阅读说明：本技术 水平井冲砂泡沫液及其制备方法 (Horizontal well sand washing foam liquid and preparation method thereof ) 是由 丛日凯 苑新红 窦军 杨育恒 罗磊 于 2020-03-19 设计创作，主要内容包括：本发明涉及油田化学助剂制备技术领域,是一种水平井冲砂泡沫液及其制备方法,该水平井冲砂泡沫液,原料按质量百分含量计包括起泡剂1.5%至3%、稳泡剂0.5%至1%、活性助排剂0.1%、其余为水,按照下述方法得到：依次将所需量的水、起泡剂、稳泡剂和活性助排剂混合均匀,搅拌20min至30min,得到水平井冲砂泡沫液。本发明能有效解决水平井冲砂不返、携砂性能差、斜井段易形成砂桥的弊端,能够将水平井斜井段、水平段的砂和堵塞物彻底携带出井口,达到水平井冲砂干净,恢复水平井产能的目的。(The invention relates to the technical field of oilfield chemical auxiliary preparation, in particular to a horizontal well sand washing foam liquid and a preparation method thereof, wherein the horizontal well sand washing foam liquid comprises the following raw materials, by mass, 1.5-3% of a foaming agent, 0.5-1% of a foam stabilizer, 0.1% of an active cleanup additive and the balance of water, and is obtained according to the following method: and (3) uniformly mixing the required amount of water, the foaming agent, the foam stabilizer and the active cleanup additive in sequence, and stirring for 20min to 30min to obtain the sand washing foam liquid for the horizontal well. The invention can effectively solve the defects that the sand washing of the horizontal well does not return, the sand carrying performance is poor and a sand bridge is easily formed at the inclined shaft section, and can thoroughly carry the sand and the blockage at the inclined shaft section and the horizontal section of the horizontal well out of the well mouth, thereby achieving the purposes of cleaning the sand washing of the horizontal well and recovering the productivity of the horizontal well.)

1. The horizontal well sand washing foam liquid is characterized by comprising 1.5-3% of foaming agent, 0.5-1% of foam stabilizer, 0.1% of active cleanup additive and the balance of water by mass percent, and is obtained by the following method: and (3) uniformly mixing the required amount of water, the foaming agent, the foam stabilizer and the active cleanup additive in sequence, and stirring for 20min to 30min to obtain the sand washing foam liquid for the horizontal well.

2. The horizontal well sand washing foam solution as claimed in claim 1, wherein the foam stabilizer is one of polyacrylamide, polyvinyl alcohol and cellulose.

3. The horizontal well sand washing foam solution as claimed in claim 1 or 2, which is characterized in that the foaming agent is obtained by the following method: adding sodium hydroxide into dodecyl benzene sulfonic acid with required amount to obtain a mixed solution, uniformly stirring the mixed solution at 35-40 ℃, adjusting the pH value of the mixed solution to 7-8 to obtain sodium dodecyl benzene sulfonate, mixing water with sodium dodecyl benzene sulfonate with required amount to obtain a sodium dodecyl benzene sulfonate solution, adding triethanolamine with required amount into the sodium dodecyl benzene sulfonate solution, and uniformly stirring at 25-35 ℃ to obtain the foaming agent.

4. The horizontal well sand washing foam liquid as claimed in claim 3, wherein the foaming agent comprises 35% of dodecylbenzene sulfonic acid, triethanolamine and water by mass: 25%: 40 percent.

5. The horizontal well sand washing foam solution as claimed in claim 1, 2, 3 or 4, wherein the active cleanup additive is a fluorocarbon surfactant.

6. A preparation method of a horizontal well sand washing foam liquid is characterized by comprising the following steps: and (3) uniformly mixing the required amount of water, the foaming agent, the foam stabilizer and the active cleanup additive in sequence, and stirring for 20min to 30min to obtain the sand washing foam liquid for the horizontal well.

Technical Field

The invention relates to the technical field of preparation of oilfield chemical additives, and discloses a horizontal well sand washing foam liquid and a preparation method thereof.

Background

The horizontal well is that the well head reaches or is close to 90, and the well bore drills into the well of certain length along the horizontal direction, and the well bore horizontal extension is a certain length of distance in the oil reservoir, sometimes for certain special needs, the well head can exceed 90, and generally speaking, the horizontal well is applicable to thin hydrocarbon reservoir or fractured hydrocarbon reservoir, and the exposed area in aim at increase hydrocarbon reservoir.

At present, a horizontal well becomes an important oil extraction process technology at home and abroad, a series of problems are generated along with the increase of the number of the horizontal wells, and due to the particularity of a well body structure of the horizontal well, compared with sand washing of a straight well, a well section needing to be washed of the horizontal well is very long, and particularly, sand carrying capacity of a well washing liquid in the horizontal well section and an inclined well section is low, so that sand grains are easy to settle and are not easy to be washed up and cleaned, and a sand bridge is easily formed in the highly inclined well section when a pump is stopped, so that sand blocking accidents in the sand washing process are caused. Therefore, the development and research of the well flushing fluid for assisting the sand washing and blockage removing process of the horizontal well have important significance.

Disclosure of Invention

The invention provides a sand washing foam liquid for a horizontal well and a preparation method thereof, overcomes the defects of the prior art, and can effectively solve the problems that sand washing does not return, sand carrying performance is poor, and a sand bridge is easily formed at an inclined well section to influence the productivity of the horizontal well in the prior art.

One of the technical schemes of the invention is realized by the following measures: the horizontal well sand washing foam liquid comprises, by mass, 1.5% to 3% of a foaming agent, 0.5% to 1% of a foam stabilizer, 0.1% of an active cleanup additive and the balance of water, and is obtained by the following method: and (3) uniformly mixing the required amount of water, the foaming agent, the foam stabilizer and the active cleanup additive in sequence, and stirring for 20min to 30min to obtain the sand washing foam liquid for the horizontal well.

The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:

the foam stabilizer is one of polyacrylamide, polyvinyl alcohol and cellulose.

The foaming agent is obtained by the following method: adding sodium hydroxide into dodecyl benzene sulfonic acid with required amount to obtain a mixed solution, uniformly stirring the mixed solution at 35-40 ℃, adjusting the pH value of the mixed solution to 7-8 to obtain sodium dodecyl benzene sulfonate, mixing water with sodium dodecyl benzene sulfonate with required amount to obtain a sodium dodecyl benzene sulfonate solution, adding triethanolamine with required amount into the sodium dodecyl benzene sulfonate solution, and uniformly stirring at 25-35 ℃ to obtain the foaming agent.

The foaming agent comprises 35% of dodecyl benzene sulfonic acid, triethanolamine and water in percentage by mass: 25%: 40 percent.

The active cleanup additive is a fluorocarbon surfactant.

The second technical scheme of the invention is realized by the following measures: a preparation method of a horizontal well sand washing foam liquid comprises the following steps: and (3) uniformly mixing the required amount of water, the foaming agent, the foam stabilizer and the active cleanup additive in sequence, and stirring for 20min to 30min to obtain the sand washing foam liquid for the horizontal well.

The invention can effectively solve the defects that the sand washing of the horizontal well does not return, the sand carrying performance is poor and a sand bridge is easily formed at the inclined shaft section, and can thoroughly carry the sand and the blockage at the inclined shaft section and the horizontal section of the horizontal well out of the well mouth, thereby achieving the purposes of cleaning the sand washing of the horizontal well and recovering the productivity of the horizontal well.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention. The various chemical reagents and chemical articles mentioned in the invention are all the chemical reagents and chemical articles which are well known and commonly used in the prior art, unless otherwise specified; the percentages in the invention are mass percentages unless otherwise specified; the solution in the present invention is an aqueous solution in which the solvent is water, for example, a hydrochloric acid solution is an aqueous hydrochloric acid solution, unless otherwise specified; the normal temperature and room temperature in the present invention generally mean a temperature of 15 ℃ to 25 ℃, and are generally defined as 25 ℃.

The invention is further described below with reference to the following examples: