Isebenza njani iValve ye-Bypass (MCBV) yokuVuselelwa ngokuNinzi?

Kwimeko yokulahleka kokujikeleza ngexesha lokugaya, ukusetyenziswa kokusebenza okuphindaphindiweyo kwe-valve ye-bypass kunokufikelela kwi-concentration ephezulu, i-particle enkulu ye-plugging materials kunye ne-pluging cement plugging ngaphandle kokukhupha i-BHA.

Ukuvulwa kwevalve ye-bypass: ngaphambi kokusebenza kweplagi, okokuqala ukukhupha ngaphandle kwe-BHA ukuya kwicandelo elikhuselekileyo lomthombo kwaye ulahle ibhola esebenzayo. Xa ibhola esebenzayo ibekwe kwisihlalo sebhola, impompo ephantsi iya kubamba ngokukhawuleza uxinzelelo. Xa umahluko woxinzelelo ufikelela kwi-0.7-1.5mpa, uxinzelelo lokubamba uxinzelelo lukhulu kunamandla entwasahlobo ukwenza umkhono we-sliding wehle. Xa umkhono wokutyibilika uhla usiya kwindawo esezantsi yomda, umngxuma odlulayo womkhono wokutyibilika ulungelelaniswa nomngxuma odlulayo ongasentla, kwaye ivalve yokudlula iyavulwa. Ukwandisa ukufuduka kwindawo yokwakhiwa, ukupompa kwi-plug slurry, kunye ne-plugging slurry ingena kwinqanaba lokuvuza ukusuka kumngxuma wokudlula ukuplaga ngokuthe ngqo. Xa umpompo umisiwe, umkhono we-sliding uya kusetha kwakhona phantsi kwe-spring force, kwaye i-valve ye-bypass iya kuvala ngokuzenzekelayo, ukuze kuncitshiswe umphumo onokwenzeka wepayipi ye-U okanye iingxaki zokulawula kakuhle. Xa umngxuma we-bypass ufuna ukuvulwa kwakhona, impompo inokuphinda iqhutywe kwakhona ngokucothayo.

Ukuvalwa kwe-valve ye-by-pass: emva kokugqitywa kokwakhiwa kweplagi, xa kuyimfuneko ukuqalisa ukugaya, ukulahla iibhola ezimbini ezivaliweyo. Xa ibhola evaliweyo ifikelela kumngxuma wokudlula, iqala ukubamba uxinzelelo kwaye inyuse kancinci uxinzelelo. Xa umahluko woxinzelelo ufikelela kuxinzelelo oluyiliweyo lwe-chear yebhola esebenzayo (uxinzelelo loyilo yi-10 MPa), ibhola esebenzayo iyachetywa kwaye idlule kwisihlalo sebhola, kunye nebhola esebenzayo kunye nebhola evaliweyo yonke iwela kwibhasikithi yebhola. Umkhono wokutyibilika uhambela phezulu phantsi kwesenzo samandla entwasahlobo, umngxuma odlulayo womkhono wokutyibilika uyagxadazela kunye nomngxuma we-bypass we-joint ephezulu, ivalve ye-bypass ivaliwe kwaye ukubhola kuqalwa kwakhona.

Ekusebenzeni kwequla elithe tyaba, eliqondiswe kakuhle kwaye lijikwe kakuhle, ukusetyenziswa kwevalve yokuvula i-bypass emininzi, enokuqonda indawo enkulu yokugungxulwa kunye nokugungxulwa kwebhedi, okungaphuculi nje ukusebenza kakuhle kokugungxulwa, kodwa ikwakhusela izixhobo kunye nezixhobo zokuthoba. , Ukuba kuyimfuneko, vula umngxuma we-bypass ukucoca udonga lwangaphakathi lwe-casing okanye iqela le-BOP.

Xa inkqubo ye-bypass kufuneka ivalwe, faka iibhola ezimbini ezivaliweyo, cinezela ngaphandle kwebhola lokutshixa ngoxinzelelo lokubamba (uxinzelelo loyilo lokuvala i-extrusion yebhola yi-7MPa), kwaye uqhubeke ubambe uxinzelelo lokuvala inkqubo yokudlula.