阅读说明：本技术 连续油管钻塞液及其使用方法 (Coiled tubing drilling plug liquid and using method thereof ) 是由 邹鹏 张曙光 张世林 李晓祥 吴英新 马超 杜承强 郑海生 黄其 李楠 邵俊龙 于 2020-04-28 设计创作，主要内容包括：本发明公开了一种连续油管钻塞液及其使用方法,钻塞液由钻塞液A和钻塞液B构成；钻塞液A由粘土稳定剂、减摩剂和水构成；钻塞液B由减阻剂悬浮液、粘土稳定剂和水构成；粘土稳定剂为季铵盐、磺酰基季铵盐或苄基季铵盐；减摩剂为太古油、乙二醇、异构十三醇聚氧化乙烯醚和水形成的水包油型乳液；减阻剂悬浮液为稠化剂、悬浮剂、活化剂和分散剂形成的非水体系；使用时先在井筒内顶替钻塞液A,待下入连续油管至目的井段时在连续油管内以一定排量泵注连续油管钻塞液A或钻塞液A与钻塞液B的混合液；该连续油管钻塞液不易腐败变质、携带钻屑及胶皮能力强、可解除油管下入时的“自锁”现象、钻塞所需时间短、对地层无伤害、且配伍性好。(The invention discloses a coiled tubing drilling and plugging liquid and a use method thereof, wherein the drilling and plugging liquid consists of a drilling and plugging liquid A and a drilling and plugging liquid B; the drilling and plugging liquid A consists of a clay stabilizer, a friction reducer and water; the drilling and plugging liquid B consists of drag reducer suspension, a clay stabilizer and water; the clay stabilizer is quaternary ammonium salt, sulfonyl quaternary ammonium salt or benzyl quaternary ammonium salt; the friction reducer is an oil-in-water emulsion formed by Turkey red oil, ethylene glycol, isomeric tridecanol polyoxyethylene ether and water; the drag reducer suspension is a non-aqueous system formed by a thickening agent, a suspending agent, an activating agent and a dispersing agent; when the drilling and plugging fluid A is used, the drilling and plugging fluid A is replaced in a shaft, and the drilling and plugging fluid A of the coiled tubing or the mixed solution of the drilling and plugging fluid A and the drilling and plugging fluid B is injected into the coiled tubing by a certain displacement pump when the coiled tubing is lowered to a target well section; the drilling plug liquid for the continuous oil pipe is not easy to decay, has strong capability of carrying drill cuttings and rubber, can eliminate the self-locking phenomenon when the oil pipe is put down, has short time for drilling the plug, has no harm to the stratum and has good compatibility.)

1. The coiled tubing drilling plugging fluid is characterized by consisting of a coiled tubing drilling plugging fluid A and a coiled tubing drilling plugging fluid B; the coiled tubing drilling plug fluid A comprises, by mass, 0.2-2% of a clay stabilizer, 0.3-5% of a friction reducer and the balance of water, wherein the mass fraction of each component is 100%; the coiled tubing drilling plug fluid B is composed of 0.3-5% of drag reducer suspension, 0.2-2% of clay stabilizer and the balance of water by mass fraction, and the mass fraction of each component is 100%; wherein the content of the first and second substances,

the clay stabilizer is quaternary ammonium salt, sulfonyl quaternary ammonium salt or benzyl quaternary ammonium salt;

the antifriction agent is an oil-in-water emulsion formed by 5-15% of Turkey red oil, 10-20% of ethylene glycol, 15-40% of isomeric tridecanol polyoxyethylene ether and the balance of water in percentage by mass;

the drag reducer suspension is a non-aqueous system formed by 20-40% of a thickening agent, 0.4-5% of a suspending agent, 0.05-0.2% of an activating agent and the balance of a dispersing agent in percentage by mass; the thickening agent is an anionic acrylamide derivative with the molecular weight of 800-1800 ten thousand; the suspending agent is nano hydrophilic organic clay, quaternary ammonium salt modified montmorillonite or high-substitution-degree hydroxypropyl cellulose; the activating agent is methanol or ethanol; the dispersing agent is polyethylene glycol with the molecular weight of 200-1000 or polypropylene glycol with the molecular weight of 400-1000.

2. The coiled tubing corking fluid according to claim 1, wherein the clay stabilizer is quaternary ammonium salt I, quaternary ammonium salt II, quaternary ammonium salt III, sulfonyl quaternary ammonium salt I, sulfonyl quaternary ammonium salt II, sulfonyl quaternary ammonium salt III, sulfonyl quaternary ammonium salt IV, sulfonyl quaternary ammonium salt V, sulfonyl quaternary ammonium salt VI, sulfonyl quaternary ammonium salt VII, benzyl quaternary ammonium salt I or benzyl quaternary ammonium salt II; wherein the content of the first and second substances,

the chemical structural formula of the quaternary ammonium salt I is as follows:

the chemical structural formula of the quaternary ammonium salt II is as follows:

the chemical structural formula of the quaternary ammonium salt III is as follows:

the chemical structural formula of the sulfonyl quaternary ammonium salt I is as follows:

the chemical structural formula of the sulfonyl quaternary ammonium salt II is as follows:

the chemical structural formula of the sulfonyl quaternary ammonium salt III is as follows:

the chemical structural formula of the sulfonyl quaternary ammonium salt IV is as follows:

the chemical structural formula of the sulfonyl quaternary ammonium salt V is as follows:

the chemical structural formula of the sulfonyl quaternary ammonium salt VI is as follows:

the chemical structural formula of the sulfonyl quaternary ammonium salt VII is as follows:

the chemical structural formula of the benzyl quaternary ammonium salt I is as follows:

the chemical structural formula of the benzyl quaternary ammonium salt II is as follows:

3. the coiled tubing drilling fluid of claim 1, wherein the anionic acrylamide derivative is anionic acrylamide derivative I, anionic acrylamide derivative II, or anionic acrylamide derivative III; wherein the content of the first and second substances,

the chemical structural formula of the anionic acrylamide derivative I is as follows:

the chemical structural formula of the anionic acrylamide derivative II is as follows:

the chemical structural formula of the anionic acrylamide derivative III is as follows:

4. the using method of the coiled tubing drilling and plugging fluid according to claim 1, characterized by comprising the steps of replacing the coiled tubing drilling and plugging fluid A in a well bore before the coiled tubing is put in, wherein the replacing capacity is consistent with the volume of the well bore, pumping the coiled tubing drilling and plugging fluid A in the coiled tubing with a displacement of 400L/min-500L/min or pumping a mixed solution of the coiled tubing drilling and plugging fluid A and the coiled tubing drilling and plugging fluid B with the same displacement when the coiled tubing is put in a target well section, wherein the volume ratio of the coiled tubing drilling and plugging fluid A to the coiled tubing drilling and plugging fluid B in the mixed solution is 1: 10-50.

Technical Field

The invention relates to the technical field of underground operation of exploration and development of oil and gas fields, in particular to a coiled tubing drilling plug liquid and a using method thereof.

Background

With the deep exploration and development of unconventional oil and gas resources such as shale oil and gas, dense oil and gas and the like in China, a long horizontal section horizontal well drilling technology and a bridge plug-cable perforation combined staged fracturing technology become mainstream technologies for exploration and development. Meanwhile, the horizontal section is longer and longer, the section distance is gradually reduced, the number of sections and the number of bridge plugs are more and more, the difficulty of drilling plugs after the coiled tubing is pressed and the underground complexity are increased, and the matching use of the coiled tubing drilling plug liquid is particularly important for reducing the construction risk of coiled tubing drilling plug operation.

Coiled tubing drilling plugging fluid needs to have three main functions: 1) the resistance reduction effect is good, namely the drilling plug fluid is pumped from a wellhead to a target well section through a coiled tubing, the on-way friction resistance is low, the resistance reduction rate is high, the pumping pressure is reduced, and the circulation is convenient; 2) the drilling fluid has excellent portability, namely has carrying capacity on metal drilling cuttings, rubber crumbs and the like generated after the continuous oil pipe is drilled and plugged, is convenient to carry out of a well, and avoids drill jamming; 3) the anti-friction effect is good, namely, for a long horizontal section horizontal well, the coiled tubing is easy to generate self-locking after being lowered to a certain depth, the drilling and plugging fluid has anti-friction property so as to reduce the friction coefficient between the coiled tubing and a shaft, increase the continuous oil lowering depth and ensure that the coiled tubing reaches a target well section before generating self-locking to carry out drilling and plugging operation.

However, the current continuous oil drilling plug fluid has the following disadvantages: 1) most of the thickening agents which have the function of carrying the drill cuttings contain xanthan gum and the like, the vegetable gum is easy to decay, the drilling and plugging fluid is not easy to store for a long time, and the reduction of the viscosity after the decay is not beneficial to exerting the carrying effect of the drill cuttings; 2) when powdery thickening agents such as polyacrylamide, polyvinyl alcohol, carboxymethyl cellulose and other polymers are prepared into the drilling and plugging fluid, the complete swelling and dissolving time is longer, the preparation concentration is low, and the drilling and plugging fluid with higher thickening agent concentration is difficult to prepare by a conventional method due to easy fish eyes; 3) the common surfactant is used as an antifriction lubricant to reduce the friction coefficient between the coiled tubing and the well bore, but the surfactant with higher content is easy to foam, which is not beneficial to the preparation of the drilling plug liquid and the safe and environment-friendly work of the well site after the drilling plug liquid is subsequently replaced.

The published patent CN105419755A proposes a continuous oil pipe drill plug liquid system and a preparation method thereof, wherein the drill plug liquid system takes water as a dispersion medium, and the weight parts of the rest components are 0.1-0.5 part of flow pattern improver, 0.25-0.3 part of polymer thickener, 0.1-0.3 part of composite synergist, 0.1-0.5 part of bactericide and 0.02-0.1 part of defoaming agent. Although the coiled tubing drill plug liquid system emphatically solves the problems of drill chip suspension and carrying out of a well during drilling and plugging through viscosity control, the coiled tubing drill plug liquid system still has the defects of low swelling and dissolving speed (10min) of a thickening agent, the need of additionally using a bactericide to maintain the viscosity of the drill plug liquid containing vegetable gum and the like, and does not solve the problem that the friction resistance between a coiled tubing and a shaft possibly causes the problem of blocking of descending in the construction process of a horizontal well with a long horizontal section.

Disclosure of Invention

The invention aims to provide a coiled tubing drilling plug fluid which overcomes the defects that a thickening agent is slow in swelling and dissolution, easy to decay and deteriorate and poor in carrying performance when a conventional drilling plug fluid is prepared, and a coiled tubing is self-locked when being put into a long horizontal section.

The invention also aims to provide a using method of the coiled tubing drilling plugging fluid.

Therefore, the technical scheme of the invention is as follows:

a coiled tubing plug drilling fluid 1 is characterized by comprising a coiled tubing plug drilling fluid A and a coiled tubing plug drilling fluid B; the coiled tubing drilling plug fluid A comprises, by mass, 0.2-2% of a clay stabilizer, 0.3-5% of a friction reducer and the balance of water, wherein the mass fraction of each component is 100%; the coiled tubing drilling plug fluid B is composed of 0.3-5% of drag reducer suspension, 0.2-2% of clay stabilizer and the balance of water by mass fraction, and the mass fraction of each component is 100%; wherein the content of the first and second substances,

the clay stabilizer is quaternary ammonium salt, sulfonyl quaternary ammonium salt or benzyl quaternary ammonium salt;

the antifriction agent is an oil-in-water emulsion formed by 5-15% of Turkey red oil, 10-20% of ethylene glycol, 15-40% of isomeric tridecanol polyoxyethylene ether and the balance of water in percentage by mass;

the drag reducer suspension is a non-aqueous system formed by 20-40% of a thickening agent, 0.4-5% of a suspending agent, 0.05-0.2% of an activating agent and the balance of a dispersing agent in percentage by mass; the thickening agent is an anionic acrylamide derivative with the molecular weight of 800-1800 ten thousand; the suspending agent is nano hydrophilic organic clay, quaternary ammonium salt modified montmorillonite or high-substitution-degree hydroxypropyl cellulose; the activating agent is methanol or ethanol; the dispersing agent is polyethylene glycol with the molecular weight of 200-1000 or polypropylene glycol with the molecular weight of 400-1000.

Preferably, the clay stabilizer is quaternary ammonium salt I, quaternary ammonium salt II, quaternary ammonium salt III, sulfonyl quaternary ammonium salt I, sulfonyl quaternary ammonium salt II, sulfonyl quaternary ammonium salt III, sulfonyl quaternary ammonium salt IV, sulfonyl quaternary ammonium salt V, sulfonyl quaternary ammonium salt VI, sulfonyl quaternary ammonium salt VII, benzyl quaternary ammonium salt I or benzyl quaternary ammonium salt II; wherein the content of the first and second substances,

the quaternary ammonium salt I is prepared by three-step reaction of ethyl aminoethanolamine, formaldehyde and dichloroethyl ether, and has a chemical structural formula as follows:

the quaternary ammonium salt II is prepared by reacting tetrahydroxyethyl diethylenetriamine with chloroform, and has a chemical structural formula as follows:

the quaternary ammonium salt III is prepared by two-step reaction of tetrahydroxyethyl diethylenetriamine, formaldehyde and chloroform, and has the chemical structural formula:

the sulfonyl quaternary ammonium salt I is prepared by reacting diethyl sulfonate with N, N-dimethylethanolamine-N, N dimethylethanolamine, and has a chemical structural formula as follows:

the sulfonyl quaternary ammonium salt II is prepared by reacting diethyl sulfonate with bis (hydroxyethyl) ethanol methyl amine, and has a chemical structural formula as follows:

the sulfonyl quaternary ammonium salt III is prepared by the reaction of dimethyl sulfonate and N, N-dimethylethanolamine-N, N dimethylethanolamine, and has a chemical structural formula as follows:

the sulfonyl quaternary ammonium salt IV is prepared by the reaction of dimethyl sulfonate and di (hydroxyethyl) ethanol methyl amine, and has a chemical structural formula as follows:

the sulfonyl quaternary ammonium salt V is prepared by reacting diethyl sulfonate with triethanolamine, and has a chemical structural formula as follows:

the sulfonyl quaternary ammonium salt VI is prepared by two-step reaction of diethyl sulfonate, diethanol amine and formaldehyde, and has a chemical structural formula as follows:

the sulfonyl quaternary ammonium salt VII is prepared by three-step reaction of ethyl aminoethanolamine, formaldehyde and diethyl sulfonate, and has a chemical structural formula as follows:

the benzyl quaternary ammonium salt I is prepared by the reaction of triethanolamine and benzyl chloride, and has the chemical structural formula:

the benzyl quaternary ammonium salt II is prepared by three-step reaction of ethyl aminoethanolamine, formaldehyde and benzyl chloride, and has a chemical structural formula as follows:

preferably, the molecular formula of isomeric tridecanol polyoxyethylene ether in the friction reducer is as follows: iso-C₁₃H₂₇O(CH₂CH₂O)_nH, wherein n is epoxyThe amount of the ethane-added substance is preferably 8.

Preferably, the anionic acrylamide derivative is an anionic acrylamide derivative I, an anionic acrylamide derivative II or an anionic acrylamide derivative III; wherein the content of the first and second substances,

the anionic acrylamide derivative I is obtained by copolymerizing acrylamide and 2-acrylamido-2-methylpropanesulfonic acid, and has the chemical structural formula:

the anionic acrylamide derivative II is obtained by copolymerizing acrylamide and sodium acrylate, and has a chemical structural formula as follows:

the anionic acrylamide derivative III is obtained by copolymerizing acrylamide, sodium acrylate and 2-acrylamido-2-methylpropanesulfonic acid, and has the chemical structural formula:

the anionic acrylamide derivatives and the clay stabilizers can be purchased from commercial products or synthesized in laboratories.

The using method of the coiled tubing drilling and plugging fluid comprises the steps of replacing the coiled tubing drilling and plugging fluid A in a shaft before the coiled tubing is put in, wherein the replacing capacity is consistent with the volume of the shaft, pumping and injecting the coiled tubing drilling and plugging fluid A with the displacement of 400L/min-500L/min in the coiled tubing when the coiled tubing is put in a target well section, or pumping and injecting a mixed solution of the coiled tubing drilling and plugging fluid A and the coiled tubing drilling and plugging fluid B with the same displacement, wherein the volume ratio of the coiled tubing drilling and plugging fluid A to the coiled tubing drilling and plugging fluid B in the mixed solution is 1: 10-1: 50.

Compared with the prior art, the coiled tubing drilling and plugging fluid is suitable for the through-flushing operation and the post-pressing drilling and plugging operation of a long-horizontal-section horizontal well in an unconventional oil-gas reservoir (comprising shale gas, shale oil, coal bed gas, dense oil and the like), the coiled tubing drilling and plugging fluid is not decayed at room temperature for a long time, the drilling and plugging fluid has strong capability of carrying drill cuttings and rubber, can eliminate the self-locking phenomenon of the coiled tubing during the downward process, is short in drilling and plugging time, free of damage to the stratum, good in compatibility with water-based fluids such as fracturing fluid and stratum water, simple and easy to operate in-situ operation procedures, the reduction rate of the friction coefficient is more than 60%, the reduction rate of the drag rate is more than 70%, the pumping wellhead pressure can be effectively reduced, and the smooth and safe.

Detailed Description

The present invention will be further described with reference to the following examples, which are not intended to limit the invention in any way. In the following examples, each component was purchased from or prepared from a commercially available product.